Failure diagnosis device for an EGR control system

Details Failure diagnosis device for an EGR control system Failure diagnosis device for an EGR control system

1992-01-16

1993-05-04

Myracle, Jerry W.

Measuring and testing

Simulating operating condition

Marine

340439, G01M 1500

Patent

active

052070930

ABSTRACT:
A failure diagnosis device for an EGR control system detects a predetermined running condition of the engine, and includes a control device which inputs values of predetermined parameters signifying the running condition of the engine at first predetermined times. The control device calculates differences between preceding input values and current input values, accumulates the differences, and opens the EGR path after determining that the EGR control system is normal, i.e. when the accumulated value reaches or exceeds a predetermined value after a second predetermined time has elapsed from when the EGR path is forcibly closed. The control device determines that the EGR control system has failed and generates an alarm when the accumulated value is below the predetermined value when the second predetermined time has elapsed.

REFERENCES:
patent: 4671107 (1987-06-01), Chiesa et al.

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