Apparatus for controlling an idle speed of an internal combustio

Details Apparatus for controlling an idle speed of an internal combustio Apparatus for controlling an idle speed of an internal combustio

1986-07-08

1987-11-24

Argenbright, Tony M.

Internal-combustion engines

Engine speed regulator

Idle speed control

F02D 4116, F02M 307

Patent

active

047081090

ABSTRACT:
An apparatus for controlling an idle speed of an internal combustion engine comprises an oxygen sensor disposed in a flow of an exhaust gas from the engine for detecting a concentration of residual oxygen in the exhaust gas, valves for varying an air-fuel ratio of a mixture to be supplied to the engine, a sensor for sensing a condition of the engine, an electronic control circuit for setting a desired air-fuel ratio and for feedback controlling the valves to make the air-fuel ratio closer to the desired air-fuel ratio on response to the signal from the oxygen sensor and for deciding whether or not the feedback control is to be executed, a sensor for detecting an idle condition of the engine, control valves for adjusting a flow rate of the mixture, and an actuator for driving the valves according to the electronic control circuit when the sensor detects the idle condition of the engine. According to the apparatus, when the feedback control is interrupted, the idle speed of the engine is lowered.

REFERENCES:
patent: 4508075 (1985-04-01), Takao et al.

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