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

1995-04-21

1997-09-02

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, F01N 328

Patent

active

056619723

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine having a catalytic converter arranged in the exhaust system, has an upstream oxygen sensor and a downstream oxygen sensor arranged in the exhaust system at locations upstream and downstream of the catalytic converter, respectively. An ECU determines a feedback control constant, based on an output from the downstream oxygen sensor, and determines an air-fuel ratio control amount, based on the determined feedback control constant and an output from the upstream oxygen sensor. The ECU carries out feedback-control of the air-fuel ratio of a mixture supplied to the engine by means of the determined air-fuel ratio control amount. The updating rate of the feedback control constant is set based on the temperature of the catalyst of the catalytic converter.

REFERENCES:
patent: 5357754 (1994-10-01), Ogawa

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