Air-fuel ratio control system for internal combustion engines

Details Air-fuel ratio control system for internal combustion engines Air-fuel ratio control system for internal combustion engines

1994-01-28

1995-01-10

Lazarus, Ira S.

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, 123703, F01N 322

Patent

active

053795911

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine calculates an air-fuel ratio feedback control parameter by proportional-integral control using a proportional factor and an integral factor, based an output signal from a second air-fuel ratio sensor arranged in an exhaust passage at a location upstream of a catalytic converter. An air-fuel ratio correction amount is calculated based on the air-fuel ratio feedback control parameter and an output signal from a first air-fuel ratio sensor arranged in the exhaust passage at a location upstream of the catalytic converter. An inversion period of the output signal from the second air-fuel ratio sensor is measured, and the proportional factor is changed according to the inversion period measured.

REFERENCES:
patent: 4106448 (1978-08-01), Noguchi
patent: 5074113 (1991-12-01), Matsuoka
patent: 5090199 (1992-02-01), Ikuta
patent: 5154055 (1992-10-01), Nakane
patent: 5228286 (1993-07-01), Demura
patent: 5247793 (1993-09-01), Yamada
patent: 5279114 (1994-01-01), Kurita
patent: 5280707 (1994-01-01), Nakashima
patent: 5311737 (1994-05-01), Komatsu
patent: 5325664 (1994-07-01), Seki

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