CONTROL SYSTEM FOR DIESEL PARTICULATE TRAP REGENERATION SYSTEM

摘要

A control system for regenerating a particulate trap located in the exhaust system of a diesel engine includes a control logic regulating the air / fuel ratio of the engine by actuating a check valve located in the exhaust system of the engine to produce an exact amount of excess oxygen allowing efficient combustion of the particulate content of the trap, but avoiding rapid and damaging combustion rates. The actual engine air / fuel ratio is compared to a controlled air / fuel ratio, and the position of the check valve is adjusted accordingly. The controlled air / fuel ratio is raised or lowered once during a predetermined time in response to a temperature error signal between the exhaust gas temperature detected in the exhaust manifold and a predetermined controlled temperature. An intervention possibility has been provided allowing the vehicle user to intervene on the regeneration when it is desired to obtain engine power, and a low power disconnection has been provided allowing the regeneration to be interrupted. when the engine is operated at low power for a certain period where regeneration is ineffective.