A METHOD OF PROTECTING A DIESEL PARTICULATE FILTER FROM OVERHEATING

摘要

A method for preventing overheating of a diesel particulate trap 15 when an engine 10 from which the diesel particulate trap 15 receives a flow of exhaust gas is idling and regeneration of the diesel particulate trap 15 is occurring is disclosed. The method comprises using an electric machine 16 to apply a load to the engine 10 and compensating for the increase in applied load by increasing an engine torque set point. The result is to reduce the concentration of Oxygen in the exhaust gas flowing to the diesel particulate trap 15 thereby reducing the intensity of combustion of soot within the diesel particulate trap 15 and reducing the temperature within the diesel particulate trap 15 during the regeneration.