System for regulating the idle speed of an internal combustion e

Details System for regulating the idle speed of an internal combustion e System for regulating the idle speed of an internal combustion e

1983-11-10

1985-03-26

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Idle speed control

123585, 123352, F02D 1110, F02D 104, F02M 5106

Patent

active

045066400

ABSTRACT:
A system for regulating the idle speed of an internal combustion engine with an electronic fuel injection system having a bypass around a throttle valve of the engine and a solenoid operated control valve provided in the bypass to control the volume of air flow passing through the bypass. The system comprises an engine speed sensor for sensing the engine speed of the engine and for producing an engine speed voltage, an idle switch responsive to idle operation of the engine for producing an idle signal, and a reference voltage circuit for producing a reference voltage corresponding to a predetermined idle speed. An operational amplifier is provided having a feedback resistor for producing a control voltage dependent on the difference between the engine speed voltage and the reference voltage. A changeover switch is provided to be responsive to the idle signal for applying the engine speed voltage to the operational amplifier. The control voltage is applied to a driver for energizing the solenoid of the solenoid operated control valve to actuate the control valve to regulate the idle speed to the predetermined idle speed.

REFERENCES:
patent: 4237838 (1980-12-01), Kinugawa et al.
patent: 4365601 (1982-12-01), Yamazoe et al.
patent: 4367708 (1983-01-01), Nakamura et al.
patent: 4375208 (1983-03-01), Furuhashi et al.
patent: 4378766 (1983-04-01), Yamazoe et al.
patent: 4389996 (1983-06-01), Yaegashi et al.
patent: 4398514 (1983-08-01), Nakamura
patent: 4426968 (1984-01-01), Onuki et al.
patent: 4428341 (1984-01-01), Hassler et al.

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