Hitachi, Ltd.

Hitachi Automotive Engineering Co., Ltd.

Takeshi Kikuchi

Yoshiyuki Tanabe

Kiyomi Morita

Katsunobu Kameta

In a fuel supply control apparatus for an internal combustion engine having an A/F ratio feed-back control with a learning function, a difference between an A/F ratio detected by an oxygen sensor and the stoichiometric value is obtained and divided into an A/F ratio correction coefficient and an A/F ratio deviation coefficient in accordance with a predetermined gains ratio. The former coefficient is stored in an area of a correction map corresponding to an operational condition of the engine at that time and the latter coefficient is accumulated in an additional storage. Upon determination of an amount of fuel to be supplied, a former coefficient is read out from the map in response to the operational condition and added to the latter coefficient read out from the additional storage to form a correction value, which is used for correcting a preliminary fuel supply amount obtained in accordance with the operational condition to determine a final fuel supply amount. With this, a quick determination of the final fuel supply amount accordingto the operational condition of the engine can be performed.

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Katsuta, Japan

Takeshi Kikuchi