Method and apparatus for controlling the air-fuel ratio of an in

Details Method and apparatus for controlling the air-fuel ratio of an in Method and apparatus for controlling the air-fuel ratio of an in

1995-02-16

1997-02-04

Heyman, Leonard E.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60284, 60285, 123674, 123691, F01N 318

Patent

active

055987028

ABSTRACT:
In a device having air-fuel ratio sensors upstream and downstream of an exhaust gas purifying catalytic converter with learning carried out based on output values from the downstream air-fuel ratio sensor, independent learning is carried out depending on whether the catalytic converter is active or not. The air-fuel ratio is then controlled based on the output value of the first air-fuel ratio sensor, the output value of the second air-fuel ratio sensor and the learned value. As a result leaning accuracy is increased and air-fuel ratio control performance enhanced.

REFERENCES:
patent: 5255512 (1993-10-01), Hamburg et al.
patent: 5303548 (1994-04-01), Shimizu et al.
patent: 5311737 (1994-05-01), Komatsu et al.
patent: 5483946 (1996-01-01), Hamburg et al.
patent: 5490381 (1996-02-01), Becker

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