Distance regeneration serves as additional safeguard to minimize the load condition of the diesel particulate filter The Engine Control Module initiates an active regeneration automatically if during the last 750 to 1000 km of travel no successful regeneration has taken place, regardless of the load condition in the diesel particulate filter. A active regen in initiated based on feedback from the following sensors, DPF pressure sensor, exhaust temperature sensors and in some vehicles the air mass sensor.ĭistance Regeneration Some vehicles may also have a “Distance regeneration” which is a distance-dependent regeneration of the particulate filter. The soot particles are burned off at an exhaust gas temperature of 550☌ to 650☌. As soon as a specific soot load has been reached in the filter, The Engine Control Module initiates an active regeneration.
Because soot particles can no longer be eliminated passively, soot accumulates in the filter. In a large portion of the operating range the exhaust gas temperatures are too low for a passive regeneration. At these temperatures the soot particles are converted into carbon dioxide through aĬombustion reaction with nitrogen dioxide.Īctive Regeneration (Also known as dynamic) This occurs primarily at higher engine load, such as in highway driving, when exhaust gas temperatures range from 350☌ to 500☌. Regeneration is needed every 300 – 800 km (200 – 500 miles), depending on driving style Passive Regeneration (Also known as spontaneous) During passive regeneration the soot particles are continuously burned without the intervention of Engine Control Module. When the counter pressure reaches 200 to 300 mbar (depending on manufacture), cleaning should start.
This gives a computational estimate about the exhaust flow, which the Engine Control Module (ECM) compares to the counter pressure created by the particle filter. The determination is based on the amount of intake air, injected fuel and load factor. The Engine Control Module (ECM) of the engine determines continually the amount of the soot mass (particles) in the particle filter and estimates the remaining operational range. Figures mentioned here are general figures and may very from brand to brand
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