Patent ID: 7370632

Claim:
A system for providing assistance in regenerating depollution means associated with oxidation catalyst-forming means integrated in an exhaust line of a motor vehicle diesel engine, and in which the engine is associated with common rail means for feeding fuel to the cylinders of the engine and adapted, at constant torque, to implement a strategy of regeneration by injecting fuel into the cylinders in at least one post-injection, the system comprising: means for detecting a request for regeneration, and thus for post-injection; means for detecting at least one of (i) a stage in which the vehicle accelerator pedal is being raised and (ii) a stage in which the vehicle engine is idling; acquisition means for acquiring the temperature downstream from the catalyst-forming means; means for responding to said temperature to determine a maximum quantity of fuel to be injected during post-injections during stages in which the engine is returning to idling as a result of the accelerator pedal being raised and stages during which the engine is idling; and means for performing at least one of (i) immediately interrupting the post-injections if the total quantity of fuel that has been injected through post-injections since the start of the post-injections during the stage of returning to idling reaches the predetermined maximum quantity during this stage of returning to idling, and (ii) progressively reducing the post-injections as soon as the total quantity of fuel that has been injected through post-injections since the start of the post-injections during the stage of the engine idling reaches the predetermined maximum quantity during this stage of the engine idling.