METHOD AND APPARATUS FOR CONTROLLING AIR-FUEL RATIO USING OXYGEN SENSOR

文件类型：PDF文档
文件大小：730K
The present invention relates to a method of controlling an air-fuel ratio using an oxygen sensor. According to an embodiment of the present invention, the method of controlling an air-fuel ratio using an oxygen sensor includes : a step of measuring voltage with an oxygen sensor; a step of determining whether the measured voltage is distorted in only one direction of a dense-to-thin direction and a thin-to-dense direction; and a step of, in response to the determination that only one direction is distorted, controlling the air-fuel ratio with a bidirectionally distorted signal made by distorting only a voltage signal of a normal direction among the dense-to-thin direction and the thin-to-dense direction. Accordingly, the present invention is able to reduce harmful exhaust gas by not unidirectionally but bidirectionally distorting a measurement value of an oxygen sensor when a front oxygen sensor is deteriorated.(AA) Start(B1, B2) No(C1, C2) Yes(DD) End(S310) One-directional distortion occurrence?(S320) Measured voltage > Normal voltage ?(S330) Dense-to-thin direction control(S340) Thin-to-dense direction calibration(S350) Thin-to-dense direction control(S360) Dense-to-thin direction calibrationCOPYRIGHT KIPO 2017