Air-fuel ratio control system

Details Air-fuel ratio control system Air-fuel ratio control system

1995-04-04

1996-08-20

Nelli, Raymond A.

Internal-combustion engines

Charge forming device

Including exhaust gas condition responsive means

60274, F02D 4100

Patent

active

055469213

ABSTRACT:
An air-fuel ratio control system for an internal combustion engine equipped with a three-way catalytic converter has first and second oxygen sensors disposed respectively upstream and downstream of the catalytic converter. An air-fuel ratio feedback correction coefficient is set in accordance with the output of the first oxygen sensor under a proportional plus integral control. The system has a control unit with a function to set a retard time in which the timing of a proportional control of air-fuel ratio control is compulsorily retarded, in accordance with the output of the second oxygen sensor. The retard time is limited within a range not longer than a maximum value set as a predetermined rate of an output cycle of the first oxygen sensor.

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