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

1988-06-14

Cox, Ronald B.

Internal-combustion engines

Engine speed regulator

Idle speed control

123352, F02N 306

Patent

active

047504617

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 an intake passage of the engine in response to first and second control pressures supplied from a change-over control valve to the vacuum chamber. An electronic control unit generates an on-off control pulse signal having a period corresponding to the rotational speed of the engine, one of on-period and 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, in response to which the change-over control valve supplies the vacuum chamber of the vacuum-operated actuator, selectively, with the first control pressure and the second control pressure, determines the engine rotational speed and a rate of decrease in the engine rotational speed, and halts the control for a predetermined period of time when the determined engine rotational speed falls within a predetermined range and at the same time the determined rate of decrease in the engine rotational speeds falls within a predetermined range.

REFERENCES:
patent: 3356081 (1967-12-01), Dennis
patent: 4086888 (1978-05-01), Roberts
patent: 4441471 (1984-04-01), Kratt
patent: 4522175 (1985-06-01), Kamifuji
patent: 4524739 (1985-06-01), Kashiwaya
patent: 4546744 (1985-10-01), Bonfigioli
patent: 4554899 (1985-11-01), Engel

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