Method of controlling air-fuel ratio

Details Method of controlling air-fuel ratio Method of controlling air-fuel ratio

1990-01-11

1991-04-02

Miller, Carl Stuart

Internal-combustion engines

Charge forming device

Fuel injection system

123440, F02D 4114

Patent

active

050039555

ABSTRACT:
A method of controlling the air fuel ratio in internal combustion, engines, comprising the steps of: updating first learning terms at a first learning speed in response to a signal from the air-fuel-ratio sensor and respectively storing them in a reloadable memory device, the first learning terms being provided for respective different ranges corresponding to different engine temperature and related to factors causing variation in air-fuel ratio in such a manner that the air-fuel-ratio variate of the variation varies depending upon the engine temperature; updating second learning terms at a second learning speed which is higher than the first learning speed in response to a signal from the air-fuel-ratio sensor and storing them in the reloadable memory device, the second learning terms being related to factors causing variation in air-fuel ratio in such a manner that the air-fuel-ratio variate of the variation varies in a substantially uniform manner with respect to the engine temperature; and determining the transient learning value on the basis of the first learning terms dependent on the engine temperature and stored in the memory device and of the second learning terms stored in the memory device, and correcting the transient correction value in accordance with the transient learning value thus determined.

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