Mikuni Kogyo Kabushiki Kaisha

Shunji Takahashi

Takashi Miyano

Minato Yamamoto

A method and device for controlling the air-fuel ratio of an internal combustion engine are disclosed. In this method and device the actuator for controlling the air-flow rate is selected as an actuator capable of causing change with passage of time frequently, and the deviation of air-fuel ratio is detected by an air-fuel sensor from a small air-flow rate point corresponding to, for example, an idling speed of engine and a large air-flow rate point corresponding to a predetermined engine speed during running thereby correcting the parameters a and b.

Method of controlling air-fuel ratio of an engine

An electronically controlled internal combustion engine provided with an accelerator position sensor wherein, in order to positively prevent violent running and make some degree of running possible, an idling switch, intermediate switch and fully opening switch issuing signals when a wiper crosses them are provided within the accelerator position sensor, in case the magnitude of the output from the accelerator position sensor when any of the above mentioned respective switches issues signal during the operation of the accelerator position sensor is not in a normal range memorized in advance, the accelerator position sensor will be judged to fail and, when the accelerator position sensor is judged to fail, signals from the accelerator position sensor will not be accepted, a desirable running state will be judged on the basis of a combination of the signals from the respective switched and an injector will be controlled.

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Oi, Japan

Shunji Takahashi