Diagnostic device for exhaust gas recirculation device

Details Diagnostic device for exhaust gas recirculation device Diagnostic device for exhaust gas recirculation device

1992-08-12

1993-09-14

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

123676, F02B 4708

Patent

active

052439496

ABSTRACT:
A diagnostic device for an exhaust gas recirculation device comprising an exhaust gas recirculation control valve. When the temperature of the engine cooling water exceeds a predetermined temperature, vacuum acts on the vacuum chamber of the exhaust gas recirculation control valve and the supply of the exhaust gas recirculation gas is started. A temperature sensor is arranged in the exhaust gas recirculation passage. When the temperature of the engine cooling water is slightly lower than the predetermined temperature, if the temperature of the interior of the exhaust gas recirculation passage exceeds a predetermined temperature, it is determined that the exhaust gas recirculation control device has malfunctioned.

REFERENCES:
patent: 4834054 (1989-05-01), Hashimoto et al.
patent: 4870941 (1989-10-01), Hisatomi
patent: 4967717 (1990-11-01), Miyazaki et al.
patent: 4974572 (1990-12-01), Aramaki
patent: 5014203 (1991-05-01), Miyazaki et al.

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