{"id":3129,"date":"2026-10-19T11:45:25","date_gmt":"2026-10-19T11:45:25","guid":{"rendered":"https:\/\/www.cybernetik.com\/blog\/?p=3129"},"modified":"2026-10-19T11:51:34","modified_gmt":"2026-10-19T11:51:34","slug":"diesel-aftertreatment-doc-dpf-scr-in","status":"publish","type":"post","link":"https:\/\/www.cybernetik.com\/blog\/cleantech\/diesel-aftertreatment-doc-dpf-scr-in\/","title":{"rendered":"Diesel Aftertreatment Explained: DOC, DPF and SCR"},"content":{"rendered":"\n<div class=\"wp-block-group has-white-color has-text-color has-background has-link-color wp-elements-55ed9e222e401b3a3f16ef3cfccfcd15 is-layout-constrained wp-container-core-group-is-layout-800b4e77 wp-block-group-is-layout-constrained\" style=\"border-top-left-radius:5px;border-top-right-radius:5px;border-bottom-left-radius:5px;border-bottom-right-radius:5px;background-color:#12263a;margin-bottom:20px;padding-top:10px;padding-right:30px;padding-bottom:30px;padding-left:30px\">\n<h2 class=\"wp-block-heading has-white-color has-text-color has-link-color wp-elements-19215f1e6a1396f83f0257af42631315\" style=\"line-height:1.4\">Key takeaways<\/h2>\n\n\n\n<div style=\"height:6px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n<style>.wp-block-kadence-iconlist.kt-svg-icon-list-items3129_9633b7-f3:not(.this-stops-third-party-issues){margin-top:0px;margin-bottom:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3129_9633b7-f3 ul.kt-svg-icon-list:not(.this-prevents-issues):not(.this-stops-third-party-issues):not(.tijsloc){margin-top:0px;margin-right:0px;margin-bottom:var(--global-kb-spacing-sm, 1.5rem);margin-left:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3129_9633b7-f3 ul.kt-svg-icon-list{grid-row-gap:35px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3129_9633b7-f3 .kb-svg-icon-wrap{font-size:10px;color:#ef8e27;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3129_9633b7-f3 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap .kt-svg-icon-list-single{margin-right:10px;}.kt-svg-icon-list-items3129_9633b7-f3 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap, .kt-svg-icon-list-items3129_9633b7-f3 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap a{line-height:1.2em;}.kt-svg-icon-list-items3129_9633b7-f3 ul.kt-svg-icon-list .kt-svg-icon-list-level-0 .kt-svg-icon-list-single svg{font-size:20px;}<\/style>\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items3129_9633b7-f3 kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><style>.kt-svg-icon-list-item-3129_8a52f5-40 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3129_8a52f5-40\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Diesel aftertreatment systems clean exhaust using a sequence of devices: the diesel oxidation catalyst (DOC) oxidizes carbon monoxide and hydrocarbons, the diesel particulate filter (DPF) traps soot, and selective catalytic reduction (SCR) converts NOx into nitrogen and water.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3129_d80c4f-17 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3129_d80c4f-17\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Each device has a specific role: the DOC produces nitrogen dioxide to support soot regeneration and SCR performance, the DPF captures particulate matter, and the ammonia slip catalyst removes unused ammonia from the exhaust.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3129_7f60e5-fb .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3129_7f60e5-fb\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">DPF regeneration can be passive, active or technician-triggered, but short trips, traffic congestion and prolonged idling often prevent regeneration from completing and cause soot accumulation.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3129_47d9b6-65 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3129_47d9b6-65\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">SCR performance depends on correct urea dosing, fluid quality and exhaust temperature; injection below roughly 180\u2013200\u00b0C can create solid deposits, while contaminated or degraded fluid reduces NOx conversion.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3129_f713f3-29 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3129_f713f3-29\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Filter blockages, permanent ash buildup, sensor faults, poor urea quality and system tampering can cause higher backpressure, reduced emissions performance and engine power restrictions, making preventive maintenance and proper operating practices essential.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3129_0baa17-37 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3129_0baa17-37\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\">Cybernetik supports emissions-component manufacturing through custom automation for fragile ceramic-substrate handling, repeatable coating processes, inspection and traceability, helping manufacturers maintain product quality and control material waste.<\/span><\/li>\n<\/ul><\/div>\n<\/div>\n\n\n\n<p class=\"has-link-color wp-elements-d1b02463fa216e42eb08b5d7e2a47414 wp-block-paragraph\">The exhaust pipe on a modern diesel truck is doing more chemistry than most people realize. Between the turbocharger and the tailpipe sit a catalyst, a filter, an injector spraying a urea solution, a second catalyst and often a third, with sensors reading temperature, pressure and NOx throughout. None of it would exist if diesel engines could simply burn fuel cleanly.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Diesel aftertreatment is the sequence of devices that cleans diesel exhaust after combustion. A diesel oxidation catalyst removes carbon monoxide and hydrocarbons, a diesel particulate filter traps soot and periodically burns it off, and selective catalytic reduction uses ammonia from a urea solution to convert NOx into nitrogen and water. The devices depend on each other, which is why problems with one usually show up as symptoms in another.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Why Diesel Engines Need All This<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">A diesel engine burns fuel with far more air than it needs. That makes it efficient, and it creates two pollutants that are difficult to deal with together.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">High combustion temperatures produce nitrogen oxides. Lowering those temperatures reduces NOx but leaves more unburned carbon, which means soot. Raising them burns the soot but makes more NOx. Engine designers have pushed this trade-off as far as it will go, and the limits in force today cannot be met by combustion control alone. The aftertreatment system exists to break that deadlock, by letting the engine run where it is efficient and cleaning the exhaust afterward.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>The Devices in Order<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Position<\/strong><\/th><th><strong>Device<\/strong><\/th><th><strong>What it does<\/strong><\/th><\/tr><\/thead><tbody><tr><td>First<\/td><td>Diesel oxidation catalyst<\/td><td>Oxidizes carbon monoxide and hydrocarbons, and makes nitrogen dioxide for the devices behind it<\/td><\/tr><tr><td>Second<\/td><td>Diesel particulate filter<\/td><td>Traps soot, which is later burned off during regeneration<\/td><\/tr><tr><td>Third<\/td><td>Urea dosing unit<\/td><td>Sprays a urea solution into the hot exhaust, where it becomes ammonia<\/td><\/tr><tr><td>Fourth<\/td><td>SCR catalyst<\/td><td>Uses that ammonia to convert NOx into nitrogen and water<\/td><\/tr><tr><td>Last<\/td><td>Ammonia slip catalyst<\/td><td>Oxidizes ammonia that passes through unused<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"has-link-color wp-elements-ad41f00e5330c410eda43a0ebd52f2b5 wp-block-paragraph\">The order is not arbitrary. The oxidation catalyst goes first because it is the simplest to light off and because the nitrogen dioxide it produces is useful downstream. The filter comes next so that soot does not foul the SCR catalyst. Urea is injected after the filter, where the exhaust is hot and relatively clean, and the ammonia slip catalyst sits last to catch anything unused.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<figure class=\"wp-block-image size-full has-custom-border\"><img fetchpriority=\"high\" decoding=\"async\" width=\"1470\" height=\"874\" src=\"https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/10\/Automation-from-Cybernetik.webp\" alt=\"\" class=\"wp-image-3182\" style=\"border-top-left-radius:5px;border-top-right-radius:5px;border-bottom-left-radius:5px;border-bottom-right-radius:5px\" srcset=\"https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/10\/Automation-from-Cybernetik.webp 1470w, https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/10\/Automation-from-Cybernetik-300x178.webp 300w, https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/10\/Automation-from-Cybernetik-1024x609.webp 1024w, https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/10\/Automation-from-Cybernetik-768x457.webp 768w\" sizes=\"(max-width: 1470px) 100vw, 1470px\" \/><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>The Diesel Oxidation Catalyst<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">This is a honeycomb brick with a washcoat carrying platinum and palladium. It oxidizes carbon monoxide and hydrocarbons into carbon dioxide and water, and it deals with the oily portion of particulate that condenses on soot.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Its more important job is making nitrogen dioxide. Converting part of the nitric oxide in the exhaust gives the filter a way to burn soot at lower temperatures than oxygen alone allows, and it improves the reaction in the SCR catalyst further along. A weak or aged oxidation catalyst therefore affects the whole system, not just its own numbers.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Like all catalysts, it does nothing below its light-off temperature, and diesel exhaust is cooler than gasoline exhaust. Cold starts and prolonged idling are where most untreated emissions occur.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>The Diesel Particulate Filter<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The filter is also a honeycomb, but with alternate channels plugged at opposite ends. Exhaust has no straight path through, so it is forced through the porous walls, and soot is left behind on the channel surfaces. Modern filters remove the large majority of particulate mass and are even more effective on the small particle counts that current standards target.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Trapping soot is the easy part. Getting rid of it is where the engineering sits, because a filter that keeps filling up eventually blocks.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Regeneration: Burning the Soot Away<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Type<\/strong><\/th><th><strong>How it happens<\/strong><\/th><th><strong>When it is used<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Passive<\/td><td>Soot burns continuously using nitrogen dioxide at normal exhaust temperature<\/td><td>Steady highway running at reasonable load<\/td><\/tr><tr><td>Active<\/td><td>The engine raises exhaust temperature deliberately to burn soot off<\/td><td>When filter loading rises and passive burning is not enough<\/td><\/tr><tr><td>Parked or forced<\/td><td>A technician triggers regeneration with the vehicle stationary<\/td><td>When the filter is heavily loaded and normal regeneration has failed<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">Passive regeneration is the quiet, efficient version. On a vehicle running at steady load, exhaust is hot enough and the nitrogen dioxide from the oxidation catalyst burns soot continuously, so the driver notices nothing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Active regeneration happens when that is not enough. The control system raises exhaust temperature, usually by injecting extra fuel that burns over the oxidation catalyst, until the soot ignites. It costs fuel and takes several minutes, and it needs the vehicle to keep running while it completes.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">This is where city vehicles struggle. Short trips, heavy traffic and long idling keep exhaust temperatures low, regenerations are started and interrupted repeatedly, and soot accumulates faster than it is removed. Many filter problems on urban delivery vehicles, buses and vans trace back to duty cycle rather than to any fault in the hardware.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Ash Is Not Soot<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Soot burns. Ash does not. Ash comes mainly from metallic additives in engine oil, and it collects in the filter permanently, slowly reducing the space available for soot.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">That means every filter eventually needs cleaning or replacement regardless of how well regeneration works, usually at high mileage. Two practical consequences follow for fleets. Oil consumption directly affects filter life, so an engine burning oil shortens the interval. And using the oil specification the manufacturer requires matters, because low-ash oils were developed specifically to slow this process.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Selective Catalytic Reduction<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">SCR is what finally deals with NOx. A metered amount of urea solution is sprayed into the hot exhaust, where it decomposes into ammonia, and the ammonia reacts with NOx over the SCR catalyst to produce nitrogen and water, both harmless.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Done well, it removes a large majority of the NOx, which is why it became the standard route for heavy diesel engines. The catalyst itself is usually based on copper or iron zeolites, and the SCR brick is often combined with the particulate filter in one unit on newer vehicles to save space and help it reach temperature faster.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Why temperature matters so much<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Urea does not decompose cleanly below roughly 180 to 200 degrees Celsius. Inject it into exhaust that is too cool and instead of ammonia you get solid deposits in the pipe and on the injector, which block the spray and reduce conversion. Control systems therefore hold off dosing until the exhaust is warm enough, which is another reason low-load city operation is harder on these systems than highway running.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Ammonia storage<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">The catalyst stores a quantity of ammonia on its surface, which lets it keep converting NOx through brief changes in engine load. The control system tracks how much is stored and doses accordingly. Too little and conversion drops; too much and ammonia escapes from the tailpipe, which is what the ammonia slip catalyst at the end is there to prevent.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-group is-nowrap is-layout-flex wp-container-core-group-is-layout-7387b849 wp-block-group-is-layout-flex\">\n<p class=\"has-text-align-left wp-block-paragraph\" style=\"font-size:29px\"><img decoding=\"async\" class=\"wp-image-503\" style=\"width: 65px\" src=\"https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/05\/Frame-1.svg\" alt=\"\"><strong>&#8220;Every stage of diesel aftertreatment contributes to emissions performance. From oxidation and soot filtration to NOx reduction, component quality and system integration determine long-term reliability.&#8221;<\/strong><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group has-luminous-vivid-amber-color has-text-color has-link-color has-medium-font-size wp-elements-6bc6b22d4811b996eac9b48d6a42bdf4 is-horizontal is-content-justification-left is-nowrap is-layout-flex wp-container-core-group-is-layout-e8523bbf wp-block-group-is-layout-flex\" style=\"text-decoration:none\">\n<div class=\"wp-block-group is-content-justification-left is-layout-constrained wp-container-core-group-is-layout-d9c85f36 wp-block-group-is-layout-constrained\">\n<figure class=\"wp-block-image alignwide size-thumbnail\" style=\"margin-top:0;margin-right:0;margin-bottom:0;margin-left:0\"><img decoding=\"async\" width=\"150\" height=\"150\" src=\"https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/05\/minus-2-150x150.png\" alt=\"\" class=\"wp-image-898\" srcset=\"https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/05\/minus-2-150x150.png 150w, https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/05\/minus-2-300x300.webp 300w, https:\/\/www.cybernetik.com\/blog\/wp-content\/uploads\/2026\/05\/minus-2.webp 512w\" sizes=\"(max-width: 150px) 100vw, 150px\" \/><\/figure>\n<\/div>\n\n\n\n<p class=\"wp-block-paragraph\"><a href=\"https:\/\/cleantech.cybernetik.com\/\" data-type=\"link\" data-id=\"https:\/\/cleantech.cybernetik.com\/\">Cybernetik Cleantech Automation Team<\/a><\/p>\n<\/div>\n\n\n\n<div class=\"wp-block-group is-layout-constrained wp-block-group-is-layout-constrained\">\n<h2 class=\"wp-block-heading\" style=\"font-size:34px\">See it in action<\/h2>\n\n\n\n<figure class=\"wp-block-embed is-type-video is-provider-youtube wp-block-embed-youtube wp-embed-aspect-16-9 wp-has-aspect-ratio\"><div class=\"wp-block-embed__wrapper\">\n<iframe title=\"Substrate Coating Line for DOC\/DPF\/SCR Catalysts | Robotic | Cybernetik Substrate Coating Automation\" width=\"800\" height=\"450\" src=\"https:\/\/www.youtube.com\/embed\/8nSpoKvNZmE?feature=oembed\" frameborder=\"0\" allow=\"accelerometer; autoplay; clipboard-write; encrypted-media; gyroscope; picture-in-picture; web-share\" referrerpolicy=\"strict-origin-when-cross-origin\" allowfullscreen><\/iframe>\n<\/div><\/figure>\n<\/div>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>The Urea Solution<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">The fluid is a solution of around 32.5 percent urea in demineralized water, sold under names such as AdBlue or diesel exhaust fluid. The concentration is not arbitrary; it is the mixture with the lowest freezing point, which matters in cold regions where tanks and lines are heated for winter operation.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Quality and handling cause more trouble than the chemistry. The solution has a limited shelf life and degrades faster in heat, which is relevant across much of India. It must not be contaminated, since diesel, dust or ordinary water will damage the dosing system or the catalyst. And topping up from open containers in a dusty yard is a common route for contamination. Fleets that treat it as carefully as they treat fuel have noticeably fewer SCR problems than those that do not.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Exhaust Gas Recirculation<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">EGR sits on the engine rather than in the exhaust system, but it belongs in the picture. Routing some exhaust back into the intake lowers peak combustion temperature and cuts NOx formation at source.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">The trade-off is familiar: less NOx, more soot. How much work is given to EGR versus SCR is a design choice. Leaning on EGR means more soot and more demand on the filter; leaning on SCR means more urea consumption. Most modern heavy engines favor SCR, which allows combustion to be tuned for efficiency and lets the aftertreatment handle NOx.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>Sensors and Control<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">None of this works without measurement. A typical system carries temperature sensors at several points, a differential pressure sensor across the filter to estimate soot loading, and NOx sensors before and after the SCR catalyst to check conversion and guide dosing.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Onboard diagnostics watch all of it. If conversion falls short, if the filter will not regenerate or if the urea tank runs empty, the system warns the driver and then restricts engine power. That behavior is deliberate and required, and it is why a sensor fault can leave a vehicle derated even though the engine itself is healthy.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\"><strong>The Indian Picture<\/strong><\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">India moved from BS IV straight to BS VI in April 2020, which introduced these systems across the market in one step rather than gradually. Real driving emissions testing added afterward means the system has to perform in ordinary traffic rather than only on a test cycle, which puts weight on exactly the low-speed, low-temperature conditions that are hardest for aftertreatment.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">For operators, three practical issues follow. Urea availability and quality vary outside major routes. Duty cycles in Indian cities involve long idling and slow traffic, which works against both regeneration and SCR dosing temperatures. And tampering, usually to avoid urea cost or clear a warning, remains a problem that damages the rest of the system and leaves the vehicle non-compliant.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>What Goes Wrong<\/strong><\/h3>\n\n\n\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th><strong>Problem<\/strong><\/th><th><strong>What causes it<\/strong><\/th><th><strong>What it leads to<\/strong><\/th><\/tr><\/thead><tbody><tr><td>Filter blocking<\/td><td>Short trips and idling that never let regeneration complete<\/td><td>Rising backpressure, warning lamps, loss of power<\/td><\/tr><tr><td>Ash build-up<\/td><td>Engine oil consumption over long service life<\/td><td>Filter cleaning or replacement at high mileage<\/td><\/tr><tr><td>Poor urea quality<\/td><td>Contaminated, diluted or expired solution<\/td><td>Crystal deposits, blocked dosing, reduced NOx conversion<\/td><\/tr><tr><td>Deposits in the dosing area<\/td><td>Urea injected below the temperature it needs<\/td><td>Blocked injector and uneven spray<\/td><\/tr><tr><td>Sensor faults<\/td><td>NOx, temperature or pressure sensors drifting or failing<\/td><td>Wrong dosing, unnecessary regeneration, derated engine<\/td><\/tr><tr><td>Tampering<\/td><td>Removing or disabling devices to avoid running costs<\/td><td>High emissions, legal exposure, damage to the rest of the system<\/td><\/tr><\/tbody><\/table><\/figure>\n\n\n\n<p class=\"wp-block-paragraph\">A pattern runs through that table. Most aftertreatment failures are not component defects. They come from duty cycle, fluid quality or engine condition, and the aftertreatment is simply where the symptom appears.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Keeping a Fleet Running<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n\n\n<style>.wp-block-kadence-iconlist.kt-svg-icon-list-items3129_0e7981-87:not(.this-stops-third-party-issues){margin-top:0px;margin-bottom:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3129_0e7981-87 ul.kt-svg-icon-list:not(.this-prevents-issues):not(.this-stops-third-party-issues):not(.tijsloc){margin-top:0px;margin-right:0px;margin-bottom:var(--global-kb-spacing-sm, 1.5rem);margin-left:0px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3129_0e7981-87 ul.kt-svg-icon-list{grid-row-gap:35px;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3129_0e7981-87 .kb-svg-icon-wrap{font-size:10px;color:#ef8e27;}.wp-block-kadence-iconlist.kt-svg-icon-list-items3129_0e7981-87 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap .kt-svg-icon-list-single{margin-right:10px;}.kt-svg-icon-list-items3129_0e7981-87 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap, .kt-svg-icon-list-items3129_0e7981-87 ul.kt-svg-icon-list .kt-svg-icon-list-item-wrap a{line-height:1.2em;}.kt-svg-icon-list-items3129_0e7981-87 ul.kt-svg-icon-list .kt-svg-icon-list-level-0 .kt-svg-icon-list-single svg{font-size:20px;}<\/style>\n<div class=\"wp-block-kadence-iconlist kt-svg-icon-list-items kt-svg-icon-list-items3129_0e7981-87 kt-svg-icon-list-columns-1 alignnone kt-list-icon-aligntop\"><ul class=\"kt-svg-icon-list\"><style>.kt-svg-icon-list-item-3129_f1967d-d0 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3129_f1967d-d0\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Match vehicles to duty. <\/strong>Vehicles that only do short urban trips will struggle with regeneration no matter how well they are maintained.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3129_aa91ab-a7 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3129_aa91ab-a7\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Let regenerations finish. <\/strong>Switching off mid-regeneration is a common cause of repeat problems, so drivers need to know what the lamp means.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3129_d20c22-a4 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3129_d20c22-a4\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Buy and store urea carefully. <\/strong>Sealed containers, reasonable storage temperature, clean funnels and attention to shelf life.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3129_b39de1-a0 .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3129_b39de1-a0\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Use the specified oil. <\/strong>Low-ash oils exist to slow ash build-up in the filter.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3129_654a1c-bc .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3129_654a1c-bc\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Fix oil consumption early. <\/strong>An engine using oil is shortening its filter life every kilometer.<\/span><\/li>\n\n\n<style>.kt-svg-icon-list-item-3129_b9d3b3-6c .kt-svg-icon-list-text mark.kt-highlight{background-color:unset;font-style:normal;color:#f76a0c;-webkit-box-decoration-break:clone;box-decoration-break:clone;padding-top:0px;padding-right:0px;padding-bottom:0px;padding-left:0px;}<\/style>\n<li class=\"wp-block-kadence-listitem kt-svg-icon-list-item-wrap kt-svg-icon-list-item-3129_b9d3b3-6c\"><span class=\"kb-svg-icon-wrap kb-svg-icon-fas_circle kt-svg-icon-list-single\"><svg viewBox=\"0 0 512 512\"  fill=\"currentColor\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\"  aria-hidden=\"true\"><path d=\"M256 8C119 8 8 119 8 256s111 248 248 248 248-111 248-248S393 8 256 8z\"\/><\/svg><\/span><span class=\"kt-svg-icon-list-text\"><strong>Treat warnings as early signals. <\/strong>Most derating events are preceded by warnings that were ignored for weeks.<\/span><\/li>\n<\/ul><\/div>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Making These Components<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">From a manufacturing standpoint, the three main devices share a production logic. Each starts as a fragile ceramic honeycomb, receives a coating whose uniformity determines performance, goes through a controlled thermal cycle, and is then wrapped and pressed into a steel can with enough force to hold it through years of vibration without cracking it.<\/p>\n\n\n\n<p class=\"has-link-color wp-elements-a4f2102294120ef0c86a30ee6ad5ae40 wp-block-paragraph\">Coating uniformity is the recurring challenge, and it matters for cost as much as for emissions, since the precious metals involved are the dominant material expense. The substrate itself, its channel structure and how coating behaves inside it are covered in the article on <a href=\"https:\/\/www.cybernetik.com\/blog\/cleantech\/catalytic-converter-substrate\/\">catalytic converter substrates<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Filters add their own requirements, including plugging alternate channels accurately and verifying that the walls filter as designed, while SCR units bring dosing hardware and mixing sections that have to be assembled and leak tested. Across all of them, traceability matters, because an emissions component may be questioned years after it was built.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\"><strong>Automation from Cybernetik<\/strong><\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Cybernetik builds automation for emission control component manufacturing as part of its CleanTech work, where the demands are precise handling, repeatable process control and records that last rather than raw speed.<\/p>\n\n\n\n<p class=\"has-link-color wp-elements-2959e815d622f20d352acc3e53e5a3fd wp-block-paragraph\">Those demands come from the parts themselves. Thin-walled ceramic substrates chip and crack, and by the time one carries a coating it represents real material value, so how it moves between stations shows up directly in scrap. Coating consistency decides both performance and precious metal cost. And because the finished unit is an emissions component, the data tying each one to its process parameters has to survive long after it leaves the plant. The wider range of work is set out under <a href=\"https:\/\/cleantech.cybernetik.com\/\">CleanTech automation<\/a>.<\/p>\n\n\n\n<p class=\"wp-block-paragraph\">Cybernetik has delivered more than 400 custom robotic automation solutions and over 6,000 systems across 30 plus countries, covering handling, process control, inspection and traceability in automotive and CleanTech manufacturing. Systems are engineered for the specific component rather than adapted from a standard model, and projects run from design through factory acceptance testing, installation and commissioning with one team responsible throughout.<\/p>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<div class=\"wp-block-group has-white-color has-text-color has-background has-link-color wp-elements-ac152bf2f15fc4c7252137b9076b5ae4 is-content-justification-space-between is-layout-flex wp-container-core-group-is-layout-bcf883e7 wp-block-group-is-layout-flex\" style=\"border-top-left-radius:5px;border-top-right-radius:5px;border-bottom-left-radius:5px;border-bottom-right-radius:5px;background-color:#12263a;margin-bottom:20px;padding-top:20px;padding-right:30px;padding-bottom:30px;padding-left:30px\">\n<h3 class=\"wp-block-heading has-white-color has-text-color has-link-color wp-elements-f22099acdeda5e510eedec4b07580a36 wp-container-content-29dca9c1\" style=\"font-size:34px;font-style:normal;font-weight:400;line-height:1.4\">Want to know more about our solution?<\/h3>\n\n\n\n<div class=\"wp-block-buttons wp-container-content-69bc4bdf is-content-justification-right is-layout-flex wp-container-core-buttons-is-layout-88867f99 wp-block-buttons-is-layout-flex\" style=\"border-style:none;border-width:0px;border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-left-radius:0px;border-bottom-right-radius:0px;margin-top:0;margin-bottom:0;padding-top:6;padding-right:6;padding-bottom:6;padding-left:6\">\n<div class=\"wp-block-button has-custom-width wp-block-button__width-100 is-style-fill\"><a class=\"wp-block-button__link has-white-color has-text-color has-background has-link-color has-text-align-right wp-element-button\" href=\"https:\/\/meetings-eu1.hubspot.com\/anand-gaikar\" style=\"background-color:#ee8d26;padding-top:10px;padding-right:20px;padding-bottom:10px;padding-left:20px\">Book a call<\/a><\/div>\n<\/div>\n<\/div>\n\n\n\n<div style=\"height:25px\" aria-hidden=\"true\" class=\"wp-block-spacer\"><\/div>\n\n\n\n<h2 class=\"wp-block-heading has-large-font-size\"><strong>Frequently asked questions<\/strong><\/h2>\n\n\n<style>.kt-accordion-id3129_4d50a7-b3 .kt-accordion-inner-wrap{column-gap:var(--global-kb-gap-md, 2rem);row-gap:14px;}.kt-accordion-id3129_4d50a7-b3 .kt-accordion-panel-inner{border-top:0px solid transparent;border-right:0px solid transparent;border-bottom:0px solid transparent;border-left:0px solid transparent;background:#ffffff;padding-top:var(--global-kb-spacing-md, 2rem);padding-right:var(--global-kb-spacing-sm, 1.5rem);padding-bottom:0px;padding-left:var(--global-kb-spacing-sm, 1.5rem);}.kt-accordion-id3129_4d50a7-b3 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header{border-top:0px solid #949494;border-right:0px solid #949494;border-bottom:1px solid #abb8c3;border-left:0px solid #949494;border-top-left-radius:0px;border-top-right-radius:0px;border-bottom-right-radius:0px;border-bottom-left-radius:0px;background:#ffffff;font-size:var(--global-kb-font-size-md, 1.25rem);line-height:1.5em;letter-spacing:-0.1px;font-weight:400;text-transform:capitalize;color:#12263a;padding-top:14px;padding-right:10px;padding-bottom:16px;padding-left:16px;}.kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap .kt-blocks-accordion-icon-trigger:before{background:#12263a;}.kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-icon-trigger{background:#12263a;}.kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-icon-trigger:before{background:#ffffff;}.kt-accordion-id3129_4d50a7-b3 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header:hover, \n\t\t\t\tbody:not(.hide-focus-outline) .kt-accordion-id3129_4d50a7-b3 .kt-blocks-accordion-header:focus-visible{color:#12263a;background:#ffffff;border-top-color:#474747;border-top-style:solid;border-right-color:#474747;border-right-style:solid;border-bottom-color:#474747;border-bottom-style:solid;border-left-color:#474747;border-left-style:solid;}.kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger:before, body:not(.hide-focus-outline) .kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle ) .kt-blocks-accordion--visible .kt-blocks-accordion-icon-trigger:after, body:not(.hide-focus-outline) .kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle ) .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger:before{background:#ff6900;}.kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger, body:not(.hide-focus-outline) .kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger{background:#ff6900;}.kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:hover .kt-blocks-accordion-icon-trigger:before, body:not(.hide-focus-outline) .kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger:after, body:not(.hide-focus-outline) .kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible .kt-blocks-accordion-icon-trigger:before{background:#ffffff;}.kt-accordion-id3129_4d50a7-b3 .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible,\n\t\t\t\t.kt-accordion-id3129_4d50a7-b3 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active{color:#12263a;background:#ffffff;border-top-color:#abb8c3;border-top-style:solid;border-right-color:#abb8c3;border-right-style:solid;border-bottom-color:#abb8c3;border-bottom-style:solid;border-left-color:#abb8c3;border-left-style:solid;}.kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basiccircle ):not( .kt-accodion-icon-style-xclosecircle ):not( .kt-accodion-icon-style-arrowcircle )  > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:before{background:#ff6900;}.kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger{background:#ff6900;}.kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:after, .kt-accordion-id3129_4d50a7-b3:not( .kt-accodion-icon-style-basic ):not( .kt-accodion-icon-style-xclose ):not( .kt-accodion-icon-style-arrow ) .kt-blocks-accordion-header.kt-accordion-panel-active .kt-blocks-accordion-icon-trigger:before{background:#ffffff;}@media all and (max-width: 1024px){.kt-accordion-id3129_4d50a7-b3 .kt-accordion-panel-inner{border-top:0px solid transparent;border-right:0px solid transparent;border-bottom:0px solid transparent;border-left:0px solid transparent;}}@media all and (max-width: 1024px){.kt-accordion-id3129_4d50a7-b3 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header{border-top:0px solid #949494;border-right:0px solid #949494;border-bottom:1px solid #abb8c3;border-left:0px solid #949494;}}@media all and (max-width: 1024px){.kt-accordion-id3129_4d50a7-b3 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header:hover, \n\t\t\t\tbody:not(.hide-focus-outline) .kt-accordion-id3129_4d50a7-b3 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.kt-accordion-pane:not(:first-child){margin-top:14px;}.kt-accordion-id3129_4d50a7-b3 .kt-accordion-panel-inner{border-top:0px solid transparent;border-right:0px solid transparent;border-bottom:0px solid transparent;border-left:0px solid transparent;}.kt-accordion-id3129_4d50a7-b3 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header{border-top:0px solid #949494;border-right:0px solid #949494;border-bottom:1px solid #abb8c3;border-left:0px solid #949494;}.kt-accordion-id3129_4d50a7-b3 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header:hover, \n\t\t\t\tbody:not(.hide-focus-outline) .kt-accordion-id3129_4d50a7-b3 .kt-blocks-accordion-header:focus-visible{border-top-color:#474747;border-top-style:solid;border-right-color:#474747;border-right-style:solid;border-bottom-color:#474747;border-bottom-style:solid;border-left-color:#474747;border-left-style:solid;}.kt-accordion-id3129_4d50a7-b3 .kt-accordion-header-wrap .kt-blocks-accordion-header:focus-visible,\n\t\t\t\t.kt-accordion-id3129_4d50a7-b3 > .kt-accordion-inner-wrap > .wp-block-kadence-pane > .kt-accordion-header-wrap > .kt-blocks-accordion-header.kt-accordion-panel-active{border-top-color:#abb8c3;border-top-style:solid;border-right-color:#abb8c3;border-right-style:solid;border-bottom-color:#abb8c3;border-bottom-style:solid;border-left-color:#abb8c3;border-left-style:solid;}}<\/style>\n<div class=\"wp-block-kadence-accordion alignnone\"><div class=\"kt-accordion-wrap kt-accordion-id3129_4d50a7-b3 kt-accordion-has-19-panes kt-active-pane-0 kt-accordion-block kt-pane-header-alignment-left kt-accodion-icon-style-none kt-accodion-icon-side-right\" style=\"max-width:none\"><div class=\"kt-accordion-inner-wrap\" data-allow-multiple-open=\"false\" data-start-open=\"0\">\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-1 kt-pane3129_c80a0c-89\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">What does a diesel aftertreatment system do?<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<p class=\"wp-block-paragraph\">It cleans exhaust after combustion. An oxidation catalyst removes carbon monoxide and hydrocarbons, a particulate filter traps soot and burns it off during regeneration, and selective catalytic reduction uses ammonia from a urea solution to convert NOx into nitrogen and water.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-2 kt-pane3129_8e234a-01\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">Why do diesel particulate filters block in city driving?<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<p class=\"wp-block-paragraph\">Because regeneration needs heat. Short trips, slow traffic and long idling keep exhaust temperatures low, so soot builds up faster than it burns off and active regenerations are often interrupted before they finish.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-3 kt-pane3129_6c0b16-49\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">What is the difference between soot and ash in a DPF?<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<p class=\"wp-block-paragraph\">Soot is carbon and burns away during regeneration. Ash comes mainly from engine oil additives, does not burn, and accumulates permanently, which is why filters eventually need cleaning or replacement at high mileage.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-11 kt-pane3129_a1be69-0b\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">Why does urea quality matter for SCR?<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<p class=\"wp-block-paragraph\">Because contaminated, diluted or degraded solution damages the dosing system and reduces NOx conversion. The fluid also needs to be injected into exhaust above roughly 180 to 200 degrees Celsius, or it forms solid deposits instead of ammonia.<\/p>\n<\/div><\/div><\/div>\n\n\n\n<div class=\"wp-block-kadence-pane kt-accordion-pane kt-accordion-pane-18 kt-pane3129_92a88c-da\"><div class=\"kt-accordion-header-wrap\"><button class=\"kt-blocks-accordion-header kt-acccordion-button-label-show\" type=\"button\"><span class=\"kt-blocks-accordion-title-wrap\"><span class=\"kt-blocks-accordion-title\">Why does an engine lose power when the aftertreatment system faults?<\/span><\/span><span class=\"kt-blocks-accordion-icon-trigger\"><\/span><\/button><\/div><div class=\"kt-accordion-panel kt-accordion-panel-hidden\"><div class=\"kt-accordion-panel-inner\">\n<p class=\"wp-block-paragraph\">Onboard diagnostics monitor conversion, filter condition and urea supply. If something is wrong, the system warns the driver and then restricts engine power, which is a required response rather than a malfunction in the engine itself.<\/p>\n<\/div><\/div><\/div>\n<\/div><\/div><\/div>\n\n\n\n<p class=\"has-white-color has-text-color has-link-color wp-elements-c645e628e62f8fbab9d9726851472d16 wp-block-paragraph\"><\/p>\n\n\n\n<p class=\"wp-block-paragraph\"><\/p>\n","protected":false},"excerpt":{"rendered":"<p>The exhaust pipe on a modern diesel truck is doing more chemistry than most people realize. Between the turbocharger and the tailpipe sit a catalyst, a filter,&#8230;<\/p>\n","protected":false},"author":4,"featured_media":3181,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"footnotes":""},"categories":[9],"tags":[29],"class_list":["post-3129","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-cleantech","tag-cleantech"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v28.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Diesel Aftertreatment Explained: DOC, DPF and SCR | Cybernetik<\/title>\n<meta name=\"description\" content=\"How diesel aftertreatment works: the DOC, DPF and SCR in sequence, regeneration, urea dosing, why city duty cycles cause problems, and what goes wrong.\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link 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