Air-fuel ratio control system for internal combustion engines

Details Air-fuel ratio control system for internal combustion engines Air-fuel ratio control system for internal combustion engines

1994-11-10

1996-08-06

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, F01N 320

Patent

active

055422489

ABSTRACT:
There is provided an air-fuel ratio control system for controlling the air-fuel ratio of a mixture supplied to an internal combustion engine having an exhaust passage. The system includes upstream and downstream exhaust gas component concentration sensors arranged in the exhaust passage at respective locations upstream and downstream of a catalytic converter, for detecting concentration of a component contained in exhaust gases. Feedback control of the air-fuel ratio of the mixture is carried out based on a value of a control parameter set based on an output from the downstream exhaust gas component concentration sensor and an output from the upstream exhaust gas component concentration sensor. An inversion period is detected with which the output from the upstream exhaust gas component concentration sensor is inverted from one side to another side with respect to a predetermined level during the feedback control of the air-fuel ratio. It is determined whether or not one of the output from the downstream exhaust gas component concentration sensor and the value of the control parameter falls within a predetermined range. It is determined whether or not the inversion period is within a predetermined time period. Then, deterioration of the upstream exhaust gas component concentration sensor is determined based on results of these determinations.

REFERENCES:
patent: 5280707 (1994-01-01), Nakashima
patent: 5325664 (1994-07-01), Seki
patent: 5363647 (1994-11-01), Ohuchi

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