Fault detection method and system for exhaust gas recirculation

Details Fault detection method and system for exhaust gas recirculation Fault detection method and system for exhaust gas recirculation

1994-08-30

1995-12-12

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

731181, F02M 2507

Patent

active

054740517

ABSTRACT:
A fault detection system is provided for an exhaust gas recirculation (EGR) system. The fault detection system is constructed of an engine operation state detection device, an EGR valve opening/closing device, and a system operation fault detection device. The engine operation state detection device is provided with an air flow sensor arranged in an intake passage on an upstream side of a throttle valve, and detects the engine operation state that the pressure difference between a pressure within an intake passage on a downstream side of the throttle valve and a pressure within the intake passage on an upstream side of the throttle valve is not greater than a critical pressure. Upon detection of the above engine operation state, the EGR valve opening/closing device opens or closes an EGR valve. When a change in the output from the air flow sensor between before and after the opening or closing of the EGR valve is detected to be smaller than a predetermined fault determination value, the system operation fault detection device detects that the EGR system is not operating properly. A fault determination zone is set by avoiding a critical pressure operation zone, so that a fault in the operation of the system can be detected with good accuracy.

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