Patent ID: 6289883
Filing Date: 2001-09-18
Classification: F02B,F02D,F02M,Y02T

Abstract:
An exhaust gas recirculation control system for an engine which is provided with an intake air throttle valve between an air flow sensor operative to detect an actual amount of air introduced into an intake air passage and an exhaust gas inlet port of the intake air passage through which exhaust gas is admitted into an intake air stream for feedback controlling a recirculation amount of exhaust gas so as to bring an actual amount of intake air to a target amount of air, said exhaust gas recirculation control system comprising:engine operating condition detecting means for detecting engine operating condition of the engine; andcontrol means for determining a target amount of air according said engine operating condition, changing an operated condition of the intake air throttle valve when said engine operating condition falls in an engine operating region specified for implementation of feedback control of a recirculation amount of exhaust gas, and changing said target amount of air according to said operated condition of the intake air throttle valve.