Diagnosing system for an exhaust gas recirculation system of an

Details Diagnosing system for an exhaust gas recirculation system of an Diagnosing system for an exhaust gas recirculation system of an

1987-03-02

1988-02-09

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

123568, F02M 2506

Patent

active

047235284

ABSTRACT:
An exhaust gas recirculation system has an EGR passage communicating an exhaust pipe of an engine with an intake passage of the engine and an EGR valve provided in the EGR passage. Flow rate of recirculated gas in the EGR passage is detected and an actual EGR rate signal is produced dependent on the flow rate. A desired EGR rate signal including an allowable range is obtained in accordance with opening degree of the EGR valve. A trouble signal is generated as an alarm signal when the actual EGR rate signal is out of the allowable range.

REFERENCES:
patent: 4004559 (1977-01-01), Itoh
patent: 4075992 (1978-02-01), Linder et al.
patent: 4375800 (1983-03-01), Otsuka et al.
patent: 4428355 (1984-01-01), Yokooku
patent: 4432331 (1984-02-01), Yasuhara
patent: 4583176 (1986-04-01), Yamato et al.
patent: 4665882 (1987-05-01), Otobe

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