Patent ID: 7316107

Claim:
A diesel engine comprising: a continuously regenerating DPF comprising: a diesel particulate filter for trapping particulate matter contained in the exhaust gases; and a catalyst provided on the upstream thereof; and an exhaust throttle valve on the downstream of the continuously regenerating DPF, said exhaust throttle valve becoming to a small opening degree state when the diesel engine is operated for regenerating the diesel particulate filter by oxidizing and removing the particulate matter deposited on the diesel particulate filter and becoming to a large opening degree state when said regenerating is finished; wherein the diesel engine is operated to decrease a rotational speed when the regenerating of the diesel particulate filter has finished and, after the diesel engine is operated to decrease the rotational speed, the exhaust throttle valve becomes to the large opening degree state, and wherein the diesel engine is installed in a vehicle, and when the diesel engine is operated for the regenerating of the diesel particulate filter where the exhaust throttle valve is in the small opening degree state, the vehicle is brought into a halt and the diesel engine is operated in idling condition.