Internal-combustion engines – Charge forming device – Including exhaust gas condition responsive means
Patent
1996-02-23
1997-04-15
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Including exhaust gas condition responsive means
F02D 4100, F02D 4114
Patent
active
056199767
ABSTRACT:
A control system for an internal combustion engine has an air-fuel ratio sensor arranged in the exhaust system. An air-fuel ratio feedback control carried out based on an output from the air-fuel ratio sensor such that an air-fuel ratio of an air-fuel mixture supplied to the engine is converged to a desired air-fuel ratio is selected between a high-response feedback control using an adaptive controller of a recurrence formula type and a low-response feedback control with a lower response speed than a response speed of the high-response feedback control. Operating conditions of at least one of the engine and an automotive vehicle on which engine is installed are detected. It is determined whether or not the engine is in an unsteady operating condition in which combustion of the engine undergoes a variation, based on detected operating conditions of at least one of the engine and the vehicle. The low-response feedback control is selected at least when it is determined that the engine is in the unsteady operating condition.
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Kitagawa Hiroshi
Maki Hidetaka
Suzuki Norio
Honda Giken Kogyo Kabushiki Kaisha
Nelli Raymond A.
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