Internal-combustion engines – Charge forming device – Crankcase vapor used with combustible mixture
Patent
1986-08-29
1987-12-29
Wolfe, Jr., Willis R.
Internal-combustion engines
Charge forming device
Crankcase vapor used with combustible mixture
36443106, F02M 2506
Patent
active
047153482
ABSTRACT:
A self-diagnosis system for the exhaust gas recirculation control system of an internal combustion engine comprises a recirculation pipe for returning the exhaust gas to the intake manifold, switching unit for opening or closing the recirculation pipe, control unit for controlling the switching operation of the switching unit, operating conditions detector for detecting the operating conditions of the engine, storage unit for storing the detection values of the detector separately when the switching unit opens and closes, decision unit supplied with the detection values from the storage unit for deciding whether the difference therebetween is in a predetermined range, and an alarm unit for issuing an alarm when the decision unit decides that the difference of the detection values is in the predetermined range, thus making stable self-diagnosis possible with a simple configuration.
REFERENCES:
patent: 4375800 (1983-03-01), Otsuka et al.
patent: 4432331 (1984-02-01), Yasuhara
patent: 4541398 (1985-09-01), Kishi
5/1985 Corvette Shop Manual, Code 32, EGR System Failure, (6E3-48).
Baba Takaaki
Kobayashi Kiyotaka
Tsukasaki Hidaka
Nippondenso Co. Ltd.
Wolfe, Jr. Willis R.
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