Idle speed control system for vehicle engines

Details Idle speed control system for vehicle engines Idle speed control system for vehicle engines

1977-12-05

1981-01-06

Cox, Ronald B.

Internal-combustion engines

Engine speed regulator

Idle speed control

123353, F02M 700, F02B 3300

Patent

active

042429943

ABSTRACT:
An idling speed control system for automotive vehicle engines is disclosed. A throttle valve bypass passage for intake air is provided with an air control valve of the on-off type. The air control valve is electrically energized by a pulse train of substantially constant pulse repetition rate and pulse duration modulation so that the duty cycle of the valve is varied according to deviation of the engine idling speed from a set point value. The pulse repetition rate of the energizing pulses is higher than the frequency at which the engine can respond to air supply pulsations in the intake manifold.

REFERENCES:
patent: 3661131 (1972-05-01), Croft
patent: 3963009 (1976-06-01), Mennesson
patent: 3964457 (1976-06-01), Coscia
patent: 3998191 (1976-12-01), Beyerlein
patent: 4091777 (1978-05-01), Monpetit

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