Apparatus for and method of diagnosing exhaust gas recirculation

Details Apparatus for and method of diagnosing exhaust gas recirculation Apparatus for and method of diagnosing exhaust gas recirculation

1989-03-23

1990-12-04

Hart, Douglas

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

F02B 4708

Patent

active

049745727

ABSTRACT:
An apparatus for and a method of diagnosing an EGR system are disclosed. A temperature within an EGR passage and a rise in temperature within the EGR passage are detected or determined by calculation. When the temperature and the temperature rise are lower than predetermined values, respectively, when the engine running condition falls in a predetermined range (a diagnosis area), it is determined that the EGR system is in trouble.

REFERENCES:
patent: 4793318 (1988-12-01), Tsurusaki
patent: 4834054 (1989-05-01), Hashimoto

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