Idle speed control system for an automotive engine

Details Idle speed control system for an automotive engine Idle speed control system for an automotive engine

1988-04-08

1989-05-02

Wolfe, Willis R.

Internal-combustion engines

Engine speed regulator

Idle speed control

123587, 123588, F02M 312, F02D 4116

Patent

active

048258296

ABSTRACT:
A cold-engine operation detector is provided for producing a cold-engine signal when engine temperature is lower than a predetermined temperature, and an idle engine speed detector is provided. A dead zone for input of engine speed with respect to desired engine speed in accordance with engine temperature is stored in a memory. Width of the dead zone is provided to increase with decrease of engine temperature. A range of the dead zone in accordance with engine temperature is derived from the memory. When actual engine speed is out of a derived range of the dead zone, an actuator provided in an idle speed control system is operated for controlling the actual engine speed to the desired engine speed.

REFERENCES:
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patent: 4498436 (1985-02-01), Horiuchi
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patent: 4526144 (1985-07-01), Hasegawa et al.
patent: 4651694 (1987-03-01), Kataoka
patent: 4716871 (1988-01-01), Sakamoto et al.
patent: 4747379 (1988-05-01), Oba

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