Idle control method for an internal combustion engine

Details Idle control method for an internal combustion engine Idle control method for an internal combustion engine

1985-12-03

1986-09-23

Dolinar, Andrew M.

Internal-combustion engines

Engine speed regulator

Idle speed control

123344, 123489, F02D 4114

Patent

active

046128891

ABSTRACT:
A method of controlling an air-fuel ratio of an air-fuel mixture for an internal combustion engine includes the steps of sensing the intake air temperature and the operating state and rotating speed of the engine using various detectors. When the intake air temperature is above a predetermined temperature, when the engine is in the idle operating state, and when its rotating speed is below a predetermined speed, the control circuit ceases a normal control in which the air-fuel ratio of the air-fuel mixture is controlled to be a value in a theoretical air-fuel ratio range, and instead controls the air-fuel ratio to be a predetermined rich air-fuel ratio. With this method, a decrease in the absolute amount of fuel supplied to the engine due to a reduction in intake air quantity in the idle operating state when the intake air temperature is high is avoided, which in turn prevents a reduction in the rotating speed of the engine and ensures stability of idling.

REFERENCES:
patent: 4425886 (1984-01-01), Kuroiwa et al.
patent: 4495922 (1985-01-01), Fujimura et al.

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