Diagnosis apparatus and method for an exhaust gas recirculation

Details Diagnosis apparatus and method for an exhaust gas recirculation Diagnosis apparatus and method for an exhaust gas recirculation

1996-07-02

1997-12-30

Dombroske, George M.

Measuring and testing

Simulating operating condition

Marine

73115, 731173, 340439, 364431061, F02M 2507, G01M 1500

Patent

active

057032858

ABSTRACT:
A difference is obtained between a cylinder pressure during the compression stroke when an exhaust gas recirculation control valve is opened, and a cylinder pressure during the compression stroke when the exhaust gas recirculation control valve is closed. An estimated value for this difference is set from a cylinder pressure detected under the closed conditions and an exhaust gas recirculation proportion. When the difference is smaller than the estimated value, it is assumed that the exhaust gas recirculation quantity is not changing in accordance with open/close control, and the occurrence of a fault in the exhaust gas recirculation unit is thus judged.

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