Idling speed control system for internal combustion engines

Details Idling speed control system for internal combustion engines Idling speed control system for internal combustion engines

1986-07-01

1988-10-04

Cox, Ronald B.

Internal-combustion engines

Engine speed regulator

Idle speed control

123360, F02D 4116

Patent

active

047749202

ABSTRACT:
An idling speed control system for controlling idling rotational speed of an internal combustion engine. A vacuum-operated actuator having a diaphragm defining a vacuum chamber controls opening and closing of a throttle valve in response to pressures supplied from a change-over control valve to the vacuum chamber. The change-over control valve selectively supplies the vacuum chamber with a first control pressure for opening the throttle valve and a second control pressure for closing same. An electronic control unit generates an on-off control pulse signal having a pulse repetition period corresponding to rotational speed of the engine, one of on-period or off-period of the on-off control pulse signal having a predetermined constant value, and supplies the change-over control valve with the on-off control pulse signal. A valve opening-correcting device is operatively connected to the throttle valve and responsive to at least one predetermined external load applied on the engine for correcting to a larger opening the opening of the throttle valve which is determined by the change-over control valve in response to the on-off control pulse signal.

REFERENCES:
patent: 3356081 (1967-12-01), Dennis
patent: 4376427 (1983-03-01), Mizuno
patent: 4462355 (1984-07-01), Ozaki
patent: 4479472 (1984-10-01), Shimamura
patent: 4522175 (1985-06-01), Kamifuji
patent: 4546744 (1985-10-01), Bonfiglioli
patent: 4572141 (1986-02-01), Hasegawa
patent: 4617890 (1986-10-01), Kobayashi
patent: 4625281 (1986-11-01), Deutsch
patent: 4649878 (1987-03-01), Otobe

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