Trouble diagnosis device for EGR system

Details Trouble diagnosis device for EGR system Trouble diagnosis device for EGR system

1991-08-28

1992-08-11

Wolfe, Willis R.

Internal-combustion engines

Charge forming device

Crankcase vapor used with combustible mixture

F02M 2507

Patent

active

051370042

ABSTRACT:
A trouble diagnosis device for an exhaust gas recirculation system in an automotive vehicle. The trouble diagnosis device which basically accomplishes a trouble diagnosis in accordance with a pressure difference between an intake pressure during execution of exhaust gas recirculation and an intake pressure during stopping of the exhaust gas recirculation. The trouble diagnosis device is comprised of a throttle valve opening degree sensor to produce an output representative of an opening degree of a throttle valve. The trouble diagnosis device is further comprised of a microcomputer which functions to sample the output of the throttle valve opening degree sensor at predetermined operation cycles of the microcomputer. Then moving averages of the sampled values are given, upon which a fluctuation amount of the moving averages is detected. The trouble diagnosis is stopped in response to the fluctuation amount larger than a predetermined value.

REFERENCES:
patent: 4671107 (1987-06-01), Chiesa et al.
patent: 4715348 (1987-12-01), Kobayashi et al.
patent: 4762109 (1988-08-01), Jeenicke
patent: 4770146 (1988-09-01), Shibata et al.
patent: 4825841 (1989-05-01), Norota et al.

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