223003023 - E5070 PARTICLE FILTER SYSTEM - DESCRIPTION (MY 2005)

The DPF (Diesel Particulate Filter) is a system designed to keep down the level of particulates in the exhaust systems in diesel engines.The DPF system consists of:- the DPF filter;- sensors and actuators;- specific engine management control unit strategies.Since the filter is an accumulation system, it must be periodically regenerated (cleaned) by burning the particles present in the filter whose quantity is calculated using a control algorithm for the engine management control unit.The engine management control unit uses multiple injections to increase the temperature of the exhaust gases up to around 600°C to burn the particles.The regeneration of the filter takes place by bringing the exhaust gases at the DPF intake to a temperature of >580°C and an O2 content > 5%.The engine management control unit controls the process acting on:- diesel metering (up to 5 injections in the same engine cycle per cylinder);- control of the air (EGR, supercharging pressure).The duration of the regeneration process is variable depending on the type of vehicle and the level of blockage.During this stage the specific calibration of the engine guarantees that there is no discontinuity in the torque supplied in relation to normal operation therefore the customer should not be aware of anything and the regeneration stage should be kept activated in all engine operating conditions.The instrument panel provides the information necessary for the management of the filter regeneration process by means of warning lights and messages.A signal from the particulate trap blocked warning light indicates that the particulate filter must be regenerated and the driving profile does not allow regeneration.If the system cannot carry out the regeneration, the EOBD-engine control system failure warning light is also turned on and a message appears on the display to indicate that the filter cannot be regenerated.For further details,    See descriptions 1080B EXHAUST EMISSION CONTROL SYSTEM