Trouble diagnosis device for exhaust gas recirculation system

Details Trouble diagnosis device for exhaust gas recirculation system Trouble diagnosis device for exhaust gas recirculation system

1992-07-10

1993-08-31

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

123676, F02M 2507, F02D 4114

Patent

active

052399710

ABSTRACT:
This invention relates to a trouble diagnosis device for an exhaust gas recirculation (EGR) of an internal combustion engine. In the condition that an EGR control valve is turned on and off according to whether or not the operating condition of the engine is in the EGR control zone, and a trouble diagnosis condition is satisfied, sensors detect a plurality of engine operation conditions. A trouble diagnosis device receives the output detected by one of the sensors and compares the output with a predetermined value of the same kind as the output a normal state of the EGR system corresponding to the engine condition detected by the sensors, thereby the trouble of the EGR control system is diagnosed. Specifically, one of the sensors detects NO.sub.x in exhaust gas or exhaust gas temperature.

REFERENCES:
patent: 4462376 (1984-07-01), Ripper et al.
patent: 4793318 (1988-12-01), Tsurusaski
patent: 4794903 (1989-01-01), Suzuki
patent: 4834054 (1989-05-01), Hashimoto et al.
patent: 4870942 (1989-10-01), Shibata et al.

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