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

1988-06-28

Dolinar, Andrew M.

Internal-combustion engines

Engine speed regulator

Open loop condition responsive

123360, F02D 4116

Patent

active

047532025

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 suppliedfrom 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. The electronic control unit is adapted to gradually increase the on-off pulse control signal when the engine rotational speed is in a first region higher than a predetermined idling rotational speed region, and gradually decrease the one of the on-period and off-period of the on-off control pulse signal when the rotational speed is in a second region lower than the predetermined idling rotational speed region.

REFERENCES:
patent: 4462359 (1984-07-01), Muller
patent: 4474154 (1984-10-01), Henning et al.

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