Nippondenso Co., Ltd.

Toyota Jidosha Kogyo Kabushiki Kaisha

Nobuo Tabara

Keiji Aoki

Hiroshi Yoshida

A method and apparatus for controlling an internal combustion engine by a digital computer. A pulse generator for generating reference pulse signals in synchronism with the rotation of the crankshaft of the engine is associated with the digital computer which is programmed to discriminate the rotational speed of the engine is higher or lower than a predetermined value in response to the reference signals and digitally calculate a required amount of fuel to be supplied to the engine or the like. When the rotational speed is discriminated to be lower than the predetermined value, the required calculation, including first and second portions is completed in response to each reference pulse signal and the combustion of the engine is controlled according to the calculated value, whereas when the rotational speed is discriminated higher than the predetermined value, the first and second portions of the calculation are performed alternately in response to successive reference pulse signals, and with each reference pulse the results of the most recently executed first and second portions are combined to form a calculated value and the combustion of the engine is controlled in accordance with the calculated value.

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Chiryu, Japan

Nobuo Tabara