Engine air-fuel ratio controller

Details Engine air-fuel ratio controller Engine air-fuel ratio controller

1998-04-10

2000-01-18

Argenbright, Tony M.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

123681, 701109, F02D 4114

Patent

active

060149620

ABSTRACT:
Feedback correction of an air-fuel ratio is performed, a feedback correction amount is learned, and applied as a learning value on the next occasion that control is performed. It is determined whether or not an engine is in a high load state, and when the high load state continues for a predetermined time, the feedback correction amount is fixed at a predetermined value. The learning value is fixed at its value based on the feedback correction amount before fixing. The predetermined time is set such that the learning value in the high load state converges within this time. By applying open loop control using this learning value, surging of the vehicle due to the air-fuel ratio feedback control in the high engine load state is prevented, while the air-fuel ratio in this state is controlled precisely to the stoichiometric air-fuel ratio.

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