We are continuing with the theme of diesel particulate filters. In Part I we discussed the purpose of DPF and how it must meet the industry standard emissions regulations. More diesel service centers are finding that drivers are in need of diesel repair for problems created by a disengaged DPF.
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To help diesel vehicle owners understand the importance of the DPF, here is a brief explanation as to how the DPF works to control exhaust emissions.
Active vs. Passive -- Manufacturers use one of these two approaches to regenerate DPFs.
Passive Regeneration: Passively regenerating DPF systems are commonly found in the retrofit marketplace for construction equipment. In these applications, the vehicle's duty cycles and temperature profiles can be observed prior to filter installation. Passive systems rely on precious metal-coated substrates to heat the normal exhaust flow to temperatures that trigger regeneration. Although more sensitive to duty cycle and temperature, once installed, these DPF systems are considered to be more user friendly, as they do not require fuel additives, have no moving components, and only need to be serviced for annual cleaning.
If you are looking for Diesel Fuel Injection Milton-Freewater OR your search can be over now with our wentland diesel Auto Repair Services Milton-Freewater OR Shop. Also find Car Maintenance Milton-Freewater OR to keep your car up to date.
To help diesel vehicle owners understand the importance of the DPF, here is a brief explanation as to how the DPF works to control exhaust emissions.
Active vs. Passive -- Manufacturers use one of these two approaches to regenerate DPFs.
Passive Regeneration: Passively regenerating DPF systems are commonly found in the retrofit marketplace for construction equipment. In these applications, the vehicle's duty cycles and temperature profiles can be observed prior to filter installation. Passive systems rely on precious metal-coated substrates to heat the normal exhaust flow to temperatures that trigger regeneration. Although more sensitive to duty cycle and temperature, once installed, these DPF systems are considered to be more user friendly, as they do not require fuel additives, have no moving components, and only need to be serviced for annual cleaning.
Active Regeneration: Light diesel trucks have very different duty cycles. Active regeneration is employed when the exhaust temperatures are too irregular for a passive system to regenerate consistently. Active regeneration is accomplished by changing parameters in the engine to increase the exhaust temperatures in the DPF. This requires precise knowledge of engine parameters and access to the engine control unit. Because of this, the engine management approach is performed by the OEMs that have direct access and control over their engine design. Among the active strategies used are: late or post-injection of fuel into the combustion chamber, changes to the turbo boost, changes to the EGR valve, intake air throttling, and retarding the injection timing. All these methods can raise the exhaust temperature, but they also have negative impacts on the vehicle's fuel economy, power, and engine wear.
Filter Regeneration vs. Cleaning: Every DPF has what's called a wall-flow filter positioned in the exhaust system. As the exhaust gases pass through this filter, emissions of particulate matter, carbon monoxide, and hydrocarbons are trapped in the filter and reduced by more than 90%. This trapped diesel particulate matter settles inside the filter walls until temperatures reach levels that allow for combustion. The process of combusting these trapped particulates without an intolerable buildup of engine backpressure is called filter regeneration. The process of cleaning the DPF involves taking the filter out of the exhaust system and putting it in a special cleaning chamber.
For more questions about the purpose of the DPF, and for any problems it may cause, be sure to ask your diesel repair specialist.
In need of diesel repair? Contact our ASE Certified Technicians at Wentland Diesel Service by calling 541-938-3875 or go on-line at http://www.wentlanddiesel.com/ for more information. Our auto shop provides car and truck repair, including diesel service, to the vehicle owners in Milton-Freewater, OR, Walla Walla, WA, Pendleton, OR and surrounding areas.
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