Exhaust-gas recirculation system for an internal combustion engi

Details Exhaust-gas recirculation system for an internal combustion engi Exhaust-gas recirculation system for an internal combustion engi

1992-06-04

1993-05-11

Okonsky, David A.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

731172, F02M 2506

Patent

active

052092127

ABSTRACT:
An exhaust-gas recirculation system includes means for diagnosing the system based upon temperature values measured in the exhaust-gas return duct when certain conditions exist. A differential value between the actual temperature in the exhaust-gas return duct and a reference temperature, which indicates the possible beginning of diagnosis, is provided for a flow-through test. The differential value is then fed to a low-pass filter. If the conditions for a diagnosis are satisfied, it is determined whether the recirculation system is in order based upon a comparison of the differential value to a threshold value. A leak test of the exhaust-gas return valve can likewise be performed based upon the differential value of the two temperatures.

REFERENCES:
patent: 3850151 (1974-11-01), Mawatari et al.
patent: 4060065 (1977-11-01), Hata et al.
patent: 4531499 (1985-07-01), Eckert et al.
patent: 4793318 (1988-12-01), Tsurusaki
patent: 4870941 (1989-10-01), Hisatomi
patent: 4967717 (1990-11-01), Miyazaki et al.

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