Air-fuel ratio feedback control method for internal combustion e

Details Air-fuel ratio feedback control method for internal combustion e Air-fuel ratio feedback control method for internal combustion e

1989-03-09

1990-04-03

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Fuel injection system

123492, F02D 4114

Patent

active

049131206

ABSTRACT:
An air-fuel ratio feedback control method for an internal combustion engine, in which when the engine is operating in a feedback control region, the air-fuel ratio of an air-fuel mixture being supplied to the engine is controlled by the use of a correction coefficient varying in response to the output of an exhaust gas ingredient concentration sensor arranged in the exhaust system of the engine. When the engine has shifted to a predetermined high load region within the feedback control region, in which the rate of change in values of an engine operating parameter is larger than a predetermined value, the air-fuel ratio feedback control is effected by the use of a first average value of the correction coefficient, calculated when the engine is in the predetermined high load region. When the engine has shifted to a second predetermined region within the feedback control region other than the predetermined high load region, the feedback control is effected by the use of a second average value of the correction coefficient, calculated in the second predetermined region, in a manner different from that of calculating the first average value.

REFERENCES:
patent: 4089313 (1978-05-01), Asano et al.
patent: 4187812 (1980-02-01), Hosaka et al.
patent: 4744345 (1988-05-01), Yamato
patent: 4796589 (1989-01-01), Fujimoto et al.

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