Apparatus and method for diagnosing exhaust recirculation system

Details Apparatus and method for diagnosing exhaust recirculation system Apparatus and method for diagnosing exhaust recirculation system

1995-12-21

1997-04-08

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

731173, F02M 2507, G01M 1500

Patent

active

056178336

ABSTRACT:
In apparatus and method for diagnosing an EGR (Exhaust Gas Recirculation) system in an internal combustion engine, a combustion time duration (MT) in one combustion stroke is measured, the combustion time duration including at least an approximately combustion end period, a predictive (reference) combustion time duration (MTA) in one combustion stroke is derived on the basis of engine driving condition and a target EGR rate to be carried out by the EGR system, and the measured combustion time duration (MT) is compared with the predictive (reference) combustion time duration (MTA). Depending on a result of the comparison, the diagnosing apparatus and method determine whether a failure in the EGR system occurs.

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