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

1987-03-12

1989-04-25

Hart, Douglas

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

137554, 340686, F02B 4708

Patent

active

048237981

ABSTRACT:
An exhaust gas recirculation system has an EGR passage communicating an exhaust pipe of an engine with an intake passage of the engine, an EGR valve provided in the EGR passage, and control means for producing a valve operating signal for operating the EGR valve in accordance with engine operating conditions. A photoelectric transducer is provided for detecting the position of the EGR valve and for producing a position signal dependent on the position of the EGR valve. A control unit is provided to respond to the valve operating signal and to the position signal for producing a trouble signal as an alarm signal when the photoelectric transducer produces a position signal representing a valve state which does not accord with the valve operating signal.

REFERENCES:
patent: 2497375 (1950-02-01), Seguin
patent: 3737851 (1973-06-01), Marshall
patent: 3846774 (1974-11-01), Thorbard
patent: 4613103 (1986-09-01), Waranowitz
patent: 4665882 (1987-05-01), Otobe

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