Diagnostic device for monitoring an exhaust gas recirculation sy

Details Diagnostic device for monitoring an exhaust gas recirculation sy Diagnostic device for monitoring an exhaust gas recirculation sy

1999-03-01

2000-04-04

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

731173, G01M 1500, F02M 2507, F02B 4708

Patent

active

060448261

ABSTRACT:
A diagnostic device for monitoring an exhaust gas recirculation system determines a diagnostic value of the exhaust gas recirculation system without influencing the operation of the internal combustion engine. The diagnostic value depends on the intake pipe pressure and an observer intake pipe pressure. The latter is determined by an observer from one or more further operating variables of the internal combustion engine. The diagnostic device determines that the exhaust gas recirculation system is defective when the diagnostic value lies outside a range of values that depend on at least one operating variable.

REFERENCES:
patent: 5154156 (1992-10-01), Ohuchi
patent: 5349936 (1994-09-01), Uchinami
patent: 5508926 (1996-04-01), Wade
patent: 5542400 (1996-08-01), Matsumoto et al.

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