Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1988-09-07
1989-10-03
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
123440, F02M 5100
Patent
active
048709387
ABSTRACT:
An electronic air-fuel ratio control apparatus in an internal combustion engine provided with a learning correction function correcting a basic fuel injection quantity in response to engine states and with an oxygen sensor emitting an output voltage in response to an oxygen concentration including the same in nitrogen oxides in an exhaust gas from the engine controls an air-fuel ratio by a feedback-control of an air-fuel ratio based on a fuel injection quantity in an on-off manner. By using the oxygen sensor having the nitrogen oxides-reducing catalytic layer, the detection of a theoretical air-fuel ratio is performed on a richer side comparing with the output on the detection of a theoretical air-fuel ratio by an oxygen sensor without the nitrogen oxides-reducing function and is not changed even though the nitrogen oxides concentration changes. Accordingly, the feedback air-fuel ratio control effects to decrease the amount of nitrogen oxides so as to omit mounting of EGR control system and to stabilize the air-fuel ratio control. The basic air-fuel ratio is corrected according to a learning correction coefficient which is renewed in respect to the engine states so that the preferable basic air-fuel ratio is attained when the feedback air-fuel ratio controlling is stopped at a high load and high speed engine driving state or at a transient engine driving state.
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Japan Electronic Control Systems Co. Ltd.
Nelli Raymond A.
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