Abnormality detecting device for an EGR system

Internal-combustion engines – Charge forming device – Crankcase vapor used with combustible mixture


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F02M 2507




A detecting device for detecting abnormality in an EGR system comprises an EGR valve disposed in an EGR passage to control a flow rate of recirculated exhaust gas, a first temperature sensor disposed in the EGR passage to detect the temperature of the same, a second temperature sensor disposed in the air-intake passage of an engine, an EGR abnormality determining zone discriminating means to discriminate a specified operational zone in an operable area for the engine in which recirculation of the exhaust gas is controlled by the EGR valve. Abnormality in the EGR system is detected on the basis of a value obtained by comparison of the output of the first and second temperature sensors in the specified operational zone.

patent: 4462376 (1984-07-01), Ripper et al.
patent: 4770146 (1988-09-01), Shibata et al.
patent: 4793318 (1988-12-01), Tsurusaki
patent: 4794903 (1989-01-01), Suzuki
patent: 4834054 (1989-05-01), Hashimoto et al.


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