Failure diagnosis device for an engine which compares airfuel ra

Details Failure diagnosis device for an engine which compares airfuel ra Failure diagnosis device for an engine which compares airfuel ra

1991-04-03

1994-02-15

Trans, Vincent N.

Boots, shoes, and leggings

36443104, 123690, F02D 4122

Patent

active

052872831

ABSTRACT:
A failure diagnosis device for determining engine abnormalities by comparing the air-fuel ratio or the exhaust pressure of an engine with a predetermined value or by determining that the air fuel ratio or the exhaust pressure of the engine is different from the average air-fuel ratio or the average exhaust pressure by a predetermined amount. This comparison is made only when the engine is in a predetermined running condition in which either the air-fuel ratio or the exhaust pressure is stabilized for a predetermined period of time. When the air-fuel ratio or exhaust pressure is different from the average air-fuel ratio or from the average exhaust pressure by a predetermined value, engine abnormality can be detected for each cylinder or for each cylinder group.

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Gore, Douglas, A., et al, Society of Automotive Engineers, Inc., "Noncontact Techniques for Diesel Engine Diagnostics Using Exhaust Waveform Analysis", Dec. 1988, Paper No. 870399.

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