Self-diagnosis system for auxiliary air control system of intern

Details Self-diagnosis system for auxiliary air control system of intern Self-diagnosis system for auxiliary air control system of intern

1989-02-08

1989-10-24

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Auxiliary air or oxygen added to combustible mixture

123339, F02D 900, F02D 4118

Patent

active

048754560

ABSTRACT:
A self-diagnosis system for an auxiliary air control system of an internal combustion engine having an auxiliary air control valve provided in an auxiliary air passage bypassing a main throttle valve, comprises an air flow meter for detecting the amount of intake air, a control unit diagnosing malfunction of the air flow meter and comparing the amount of air inducted when the main throttle valve is fully closed with a value calculated according to the opening angle of the auxiliary air intake control valve. The control unit deems that the auxiliary air control system has malfunctioned only when the amount of intake air is larger than the calculated valve. In the device according to the invention, the malfunction of auxiliary air control system can be detected within a relatively short time, such as 1 sec, and the malfunction can be detected regardless of the engine speed.

REFERENCES:
patent: 4557234 (1985-12-01), Ito
patent: 4601199 (1986-07-01), Denz
patent: 4780826 (1988-10-01), Nakano et al.
patent: 4787351 (1988-11-01), Sakamoto et al.
patent: 4796588 (1989-01-01), Shimomura et al.
patent: 4817418 (1989-04-01), Asami et al.

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