Air-fuel ratio control device for an engine

Details Air-fuel ratio control device for an engine Air-fuel ratio control device for an engine

1992-05-13

1993-05-04

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60285, 123692, F01N 320

Patent

active

052070573

ABSTRACT:
An air-fuel ratio control device for an engine having two or more cylinder groups, such as a V-type engine or a horizontally opposed engine, wherein the air-fuel ratio control device controls the air-fuel ratio of cylinder groups in accordance with the output of upstream air-fuel ratio sensors and a downstream air-fuel ratio sensor. The upstream air-fuel ratio sensors are disposed in the individual exhaust passage connected to the respective cylinders upstream of the catalyst converter. The downstream air-fuel ratio sensor is disposed in the common exhaust passage downstream of the catalyst converter. The air-fuel control device usually controls the air-fuel ratios of individual cylinder groups in accordance with the output of the respective upstream air-fuel ratio sensor. When a determination of whether or not the catalyst converter has deteriorated is required, the air-fuel ratio control device controls the air-fuel ratio of all cylinder groups in accordance with the output of either one of upstream air-fuel ratio sensors, whereby the air fuel ratio of the exhaust gas flow into the catalyst converter is changed at a predetermined frequency (period). In this condition, the air-fuel ratio control device determines whether or not the catalyst converter has deteriorated by comparing the outputs of the upstream air-fuel ratio sensor and the downstream air-fuel ratio sensor.

REFERENCES:
patent: 4739614 (1988-04-01), Katsuno et al.
patent: 5074113 (1991-12-01), Matsuoka et al.

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