Abnormality detecting device for an EGR system
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United States of America Patent
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-
Nov 6, 1990
Grant Date -
N/A
app pub date -
Nov 16, 1988
filing date -
Nov 20, 1987
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
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.
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