Patent ID: 7247190
Filing Date: 2007-07-24
Classification: F02D,Y10S

Abstract:
1. An exhaust gas cleaning apparatus for an engine comprising: a fuel delivery device configured to deliver a fuel delivery quantity of fuel to the engine to produce an excess air ratio that is lean during normal operation of the engine; an exhaust gas cleaning device arranged in an exhaust system and configured to clean exhaust gas during a lean operation; and a control unit configured to control the fuel delivery device, the control unit including the regeneration control section being further configured to reduce an opening degree of the intake air throttle valve to a prescribed opening degree before the difference between the rich target value and the actual excess air ratio is less than the prescribed value, and maintain the fuel delivery quantity during regeneration before the difference between the rich target value and the actual excess air ratio is less than the prescribed value to a fuel delivery quantity being delivered before the regeneration starts.