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적분형 초음파 유량계를 이용한 SI엔진의 비정상 공연비 제어
장준석(J.S.CHang),김중일(J.I.Kim),고상근(S.Ken Kauh) 한국자동차공학회 1998 한국자동차공학회 춘 추계 학술대회 논문집 Vol.1998 No.5_1
An accurate air flow rate measurement is essential to control the fuel injection rate of MPI engine. An integration type air flow meter(IFM), composed of an ultrasonic flow meter with an integration circuit, has significantly improved the accuracy of flow rate measurement compared with a hot wire type flow meter on certain conditions where a flow reversal exists, and the sampling method is also easier. On transient conditions, a conventional fuel injection control method has a limitation because it doesn't concern the dynamic characteristic of air and fuel system. The proposed control method estimates the air mass at the cylinder port using the air mass at the throttle, and also considers the fuel film dynamics. Consequently, the relative air-fuel ratio error includes 3% using the proposed control method.