Patent ID: 6973785
Filing Date: 2005-12-13
Classification: F02B,F02D,F02M,Y02T

Abstract:
1. An apparatus for controlling recirculation of exhaust gas from an exhaust passage of an engine to an intake passage of the engine, the apparatus comprising: a recirculation passage connecting the exhaust passage to the intake passage; an EGR valve arranged in the recirculation passage, wherein the EGR valve varies its opening degree to adjust the amount of exhaust gas recirculated from the exhaust passage to the intake passage; and a controller for controlling the EGR valve, wherein the controller obtains a target opening degree of the EGR valve in accordance with an operating state of the engine and controls the EGR valve so that the opening degree of the EGR valve becomes equal to the obtained target opening degree, and, when opening the EGR valve from a fully closed state, the controller performs EGR primary control to restrict the opening degree of the EGR valve to a restricted opening degree that is smaller than the target opening degree during a predetermined delay time before actuating the EGR valve to the target opening degree so that the time when the opening degree of the EGR valve reaches the target opening degree is delayed compared to when the EGR valve is actuated from a state other than the fully closed state.