Patent ID: 6820603
Filing Date: 2004-11-23
Classification: F02D,F02M,Y02T

Abstract:
A control system for an internal combustion engine including a throttle valve and a nitrogen-enriching device that enriches nitrogen in intake air, both disposed in an intake passage, and an emission reduction device disposed in an exhaust passage, for reducing exhaust emissions,the control system comprising: an oxygen concentration sensor provided in the exhaust passage, for detecting oxygen concentration in exhaust gases; control amount-setting means for setting a control amount indicative of one of a mass of oxygen supplied to a combustion chamber of the engine and a fuel injection amount, such that the detected oxygen concentration becomes equal to an oxygen concentration corresponding to stoichiometric combustion; operating condition-detecting means for detecting operating conditions of the engine; target value-setting means for setting a target value of the control amount, which corresponds to a torque demanded of the engine, based on the detected operating conditions of the engine; and throttle valve opening control means for controlling a degree of opening of the throttle valve such that the control amount becomes equal to the set target value.