Method and apparatus for diagnosing failure in idle switch for i

Details Method and apparatus for diagnosing failure in idle switch for i Method and apparatus for diagnosing failure in idle switch for i

1987-07-01

1988-08-30

Crosland, Donnie L.

Communications: electrical

Selective

Having indication or alarm

123479, 123339, 307 10R, B60Q 100, F02M 5100

Patent

active

047680130

ABSTRACT:
A method and apparatus for diagnosing a presence or absence of failure in an idle switch installed in an internal combustion engine in which, a throttle valve of an internal combustion engine is associated with the idle switch. The throttle valve installed in the engine is usually displaced to a fully closed while the engine at least once is during each period of continuous operation, a counter is advanced whenever the engine has started and is cleared when receiving an activation signal from the idle switch, if the idle switch functions normally, a count value of the counter reaches zero by the time the engine has stopped. If the idle switch fails, the count value is advanced whenever the engine is operated and no signal from the idle switch is received. When the count value reaches a predetermined value, an alarm informing the failure of the idle switch is produced.

REFERENCES:
patent: 4531490 (1985-07-01), Kishi et al.
patent: 4580220 (1986-04-01), Braun et al.
patent: 4583176 (1986-04-01), Yamato et al.

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