Diagnostic device and method for exhaust gas recirculation syste

Details Diagnostic device and method for exhaust gas recirculation syste Diagnostic device and method for exhaust gas recirculation syste

1999-01-13

2000-08-15

Yuen, Henry C.

Internal-combustion engines

Charge forming device

Exhaust gas used with the combustible mixture

701107, 701114, F02M 2507, G06F 1700

Patent

active

06102015&

ABSTRACT:
A diagnostic device and method for an exhaust gas recirculation system achieves a prompt diagnosis without reducing accuracy. The diagnosis of an exhaust gas recirculation system, which is carried out based on an EGR temperature and an operating signal for operating an EGR control valve, is prevented when the EGR temperature is greater than a predetermined temperature, except when a rising rate of the EGR temperature is greater than a predetermined value.

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