Misfire detecting system in double air-fuel ratio sensor system

Details Misfire detecting system in double air-fuel ratio sensor system Misfire detecting system in double air-fuel ratio sensor system

1990-09-07

1991-12-03

Hart, Douglas

Power plants

Internal combustion engine with treatment or handling of...

Methods

60276, 60277, F01N 328

Patent

active

050690353

ABSTRACT:
In a double air-fuel ratio sensor system having two air-fuel ratio sensors upstream and downstream of a catalyst converter, a main air-fuel ratio correction amount is calculated in accordance with the output of the upstream air-fuel ratio sensor, and a sub air-fuel ratio correction amount is calculated in accordance with the output of the downstream air-fuel ratio sensor, thereby adjusting an air-fuel ratio using the two air-fuel ratio correction amounts. When the sub air-fuel ratio correction reaches a lean limit value, an ignition system is determined to be abnormal and a misfire may occur.

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patent: 4831838 (1989-05-01), Nagai et al.

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