Internal-combustion engines – Charge forming device – Fuel injection system
Patent
1988-05-24
1989-12-26
Nelli, Raymond A.
Internal-combustion engines
Charge forming device
Fuel injection system
123440, F02M 5100, F02M 2506, F02D 4114
Patent
active
048890995
ABSTRACT:
An air/fuel ratio control system controls fuel delivery amount on the basis of oxygen concentration in an exhaust gas. An air/fuel ratio dependent correction value is derived on the basis of the oxygen concentration. The air/fuel ratio control is performed in feedback mode and open loop mode. In feedback mode, fuel delivery amount is corrected utilizing a correction value which includes a learnt component. Learning of the learned component is performed during feedback mode operation. The learned component comprises a uniformly applicable air density dependent factor and an engine driving range dependent factor which is set with respect to each of the engine driving ranges. Learning of the air density factor and engine driving range dependent factor are selectively performed depending upon the engine driving condition.
REFERENCES:
patent: 4753208 (1988-06-01), Yamado et al.
patent: 4761950 (1988-08-01), Nagai et al.
patent: 4766870 (1988-08-01), Nakajima et al.
patent: 4768485 (1988-09-01), Brandau et al.
patent: 4789939 (1988-12-01), Namburg
Japan Electronic Control Systems Company Limited
Nelli Raymond A.
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