Diesel engine exhaust recirculating system diagnostic

Details Diesel engine exhaust recirculating system diagnostic Diesel engine exhaust recirculating system diagnostic

1997-11-13

1999-10-12

Wolfe, Willis R.

Data processing: vehicles, navigation, and relative location

Vehicle control, guidance, operation, or indication

With indicator or control of power plant

12356816, 731173, 731182, F02M 2507, F02D 4122

Patent

active

059648201

ABSTRACT:
An intake pressure and exhaust pressure of an engine are predicted from a fresh air flowrate in a diesel engine comprising an exhaust gas recirculation system and a sensor for detecting the fresh air flowrate. A fault in the system is diagnosed based on the predicted intake pressure and exhaust pressure. Preferably, fault diagnosis in the exhaust gas recirculation system is based on a differential pressure between the intake pressure and exhaust pressure, or on a comparison of an estimated EGR rate and target EGR rate found from the intake pressure and exhaust pressure, without providing any special sensors. Smoke emission is also reduced by limiting the maximum fuel injection amount of the engine.

REFERENCES:
patent: 4433666 (1984-02-01), Masaki et al.
patent: 5152273 (1992-10-01), Ohuchi
patent: 5205260 (1993-04-01), Takahashi et al.
patent: 5471051 (1995-11-01), Matsumoto et al.
patent: 5635212 (1997-06-01), Hotta et al.

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