Idling rpm feedback control method for internal combustion engin

Details Idling rpm feedback control method for internal combustion engin Idling rpm feedback control method for internal combustion engin

1984-02-17

1985-03-26

Cox, Ronald B.

Internal-combustion engines

Engine speed regulator

Idle speed control

123320, 123328, F02D 3100

Patent

active

045066418

ABSTRACT:
A method for controlling the quantity of supplementary air being supplied to an internal combustion engine during idling operation thereof in a feedback manner responsive to the difference between the actual engine rpm and desired idling rpm. When the engine is operating in a decelerating condition with the throttle valve fully closed, a provisional value of desired idling rpm is set, which is larger than a proper value of desired idling rpm by a predetermined amount. The quantity of supplementary air is controlled in a feedback manner responsive to the difference between the actual value of engine rpm and the provisional value of desired idling rpm for a predetermined period of time from the time a predetermined condition of feedback control for bringing the engine rpm to the provisional value of desired idling rpm has been satisfied as a result of comparison between the actual value of engine rpm and the provisional value of desired idling rpm. Preferably, the predetermined condition of feedback control is satisfied when the actual engine rpm has decreased below the provisional value of desired idling rpm for the first time. After the lapse of the predetermined period of time, control of the supplementary air quantity is effected in a feedback manner responsive to the difference between the actual value of engine rpm and the proper value of desired idling rpm.

REFERENCES:
patent: 4291656 (1981-09-01), Miyagi
patent: 4386591 (1983-06-01), Nagase
patent: 4406261 (1983-09-01), Ikeura

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