Idle speed control device for an engine

Details Idle speed control device for an engine Idle speed control device for an engine

1995-04-19

1996-05-07

Nelli, Raymond A.

Internal-combustion engines

Engine speed regulator

Idle speed control

F02M 300

Patent

active

055136109

ABSTRACT:
The idle speed control device according to the present invention controls a two-solenoid rotary type idle speed control valve properly even when one of the solenoids fails. When one of the solenoids fails, the device calculates the amount of bypass air from the amount of inlet air and the degree of opening of the throttle valve, and estimates the degree of opening of the idle speed control valve. If the degree of opening of the bypass valve is larger than that of the neutral valve position, the device sets the duty ratio of the control signal for driving the idle speed control valve at 0%, and if the degree of opening of the idle speed control valve is less than that of the neutral valve position, the device sets the duty ratio of the control signal at 100%. By this control, the two-solenoid rotary type idle speed control valve is maintained at neutral valve position without determining the type of the failure of the solenoids precisely.

REFERENCES:
patent: 4873954 (1989-10-01), Codling
patent: 4909213 (1990-03-01), Mezger et al.
patent: 5080061 (1992-01-01), Nishimura

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