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

1992-05-01

1994-09-06

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, 123674, 123681, 123691, F01N 320

Patent

active

053437004

ABSTRACT:
In an air-fuel ratio control system for an internal combustion engine, an output from a first air-fuel ratio sensor arranged upstream of a three-way catalyst mounted across an exhaust passage of the engine is compared with a reference value during feedback control of the air-fuel ratio. The reference value is controlled based on an output from a second air-fuel ratio sensor arranged downstream of the three-way catalyst. The reference value is changed in dependence on the engine load detected.

REFERENCES:
patent: 4733358 (1988-03-01), Abthoff
patent: 4809501 (1989-03-01), Kayanuma
patent: 4831838 (1989-05-01), Nagai
patent: 4901240 (1990-02-01), Schmidt
patent: 5065726 (1991-11-01), Klenk
patent: 5077970 (1992-01-01), Hamburg
patent: 5117631 (1992-06-01), Moser
patent: 5193339 (1993-03-01), Furuya

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