Abgasrückführungssystem für Brennkraftmaschine

摘要

An exhaust gas recirculation system for an engine is disclosed. The system comprises an EGR gas passage connecting the intake and the exhaust passages to each other, and an EGR gas control valve arranged in the EGR gas passage for controlling the amount of the EGR gas flowing through the EGR gas passage. An opening of the EGR gas control valve is controlled in accordance with an output value. The output value is represented as a sum of a basic output value, corresponding to a target opening of the EGR gas control valve, and a feedback correction coefficient. The feedback correction coefficient is represented as a sum of a proportional term and an integral term. When a change rate of the target opening is larger than an upper threshold, or is smaller than a lower threshold, the integral term is made zero, to reduce the correction.