Air-fuel ratio control system for automotive vehicle engine

Details Air-fuel ratio control system for automotive vehicle engine Air-fuel ratio control system for automotive vehicle engine

1991-08-27

1992-10-06

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Having means analyzing composition of exhaust gas

60277, 60285, 60289, F01N 320

Patent

active

051521377

ABSTRACT:
During engine idling, secondary air is introduced into the exhaust conduit at a location upstream of a three-way catalytic converter in order to promote the oxidation of HC and CO. During the supply of secondary air, the output of an air-fuel ratio sensor, which is disposed downstream of the catalytic converter and which is normally used to correct the control provided by an air-fuel ratio sensor located upstream of the catalytic converter and the supply of secondary air, is ignored during the time secondary air is supplied and for a period after the supply of secondary air is stopped.

REFERENCES:
patent: 4337746 (1982-07-01), Masaki
patent: 4385491 (1983-05-01), Sakurai
patent: 4707984 (1987-11-01), Katsuno
patent: 5088281 (1992-02-01), Izutani

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