Air-fuel ratio feedback control system having short-circuit dete

Details Air-fuel ratio feedback control system having short-circuit dete Air-fuel ratio feedback control system having short-circuit dete

1989-02-27

1990-07-17

Dolinar, Andrew M.

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60285, 123479, 123489, F02D 4122, F02D 4114

Patent

active

049413180

ABSTRACT:
In an air-fuel ratio feedback control system including at least one air-fuel ratio sensor upstream or downstream of or within a catalyst converter provided in an exhaust gas passage, an actual air-fuel ratio is controlled in accordance with the output of the air-fuel ratio sensor, which is supplied to a pull-up type input circuit. When a short-circuited state is detected in the air-fuel ratio sensor, the feedback control by the air-fuel ratio sensor is prohibited.

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