초록 ▼

Idling speed of the internal combustion engine is controlled to a predetermined engine speed by correcting an engine operating parameter, such as, an ignition timing, the quantity of fuel injection, etc., to suppress a variation rate of the engine torque. Instead of detecting the torque variation ra

Idling speed of the internal combustion engine is controlled to a predetermined engine speed by correcting an engine operating parameter, such as, an ignition timing, the quantity of fuel injection, etc., to suppress a variation rate of the engine torque. Instead of detecting the torque variation rate directly, an engine speed variation rate is detected, and a correction value of the engine parameter is determined as a function of the engine speed variation rate based on the finding that the torque variation rate can be approximated as the engine speed variation rate with a fixed phase difference therebetween. Since the phase difference is determined by the engine speed, a correction value at the present moment is obtained from the previously obtained correction value which is preceding by the phase difference.

대표청구항 ▼

A method for controlling the idle operation of an internal combustion engine comprising the steps of: detecting at successive times a rotational speed of said engine and determining a variation characteristic thereof; determining a torque variation characteristic of said engine as a function of said

A method for controlling the idle operation of an internal combustion engine comprising the steps of: detecting at successive times a rotational speed of said engine and determining a variation characteristic thereof; determining a torque variation characteristic of said engine as a function of said rotational speed variation characteristic of said engine; determining a phase difference between said rotational speed variation and torque variation characteristics as a function of said engine rotational speed; determining a present value of engine torque variation as a function of said torque variation characteristic; and controlling at least one engine operation parameter in a direction to minimize said engine torque variation.