Air/fuel ratio control device for an internal combustion engine

Internal-combustion engines – Charge forming device – Auxiliary control of carburetor fuel metering

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123440, F02B 308, F02B 3300, F02B 300, F02D 304

Patent

active

043556159

ABSTRACT:
Disclosed herewith an air/fuel ratio control device for and internal combustion engine which is capable of carrying out either feedback control or open loop control. In feedback control, a signal indicating the concentration of exhaust gas components is generated and fed to a fuel supply control device. In open loop control, a fuel injection rate is determined corresponding to intake air flow rate. For switching between feedback control and open loop control, the air/fuel ratio control device is provided with a means for detecting an abnormal condition of signal, and a means operative in response to the abnormal signal to interrupt feedback control. The air/fuel ratio control device is further provided with a means for detecting stopping of the abnormal signal and for returning control operation to feedback control.

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patent: 4167396 (1979-09-01), Kondo et al.
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patent: 4214563 (1980-07-01), Hosaka
patent: 4226221 (1980-10-01), Asano
patent: 4237829 (1980-12-01), Asano et al.
patent: 4252098 (1981-02-01), Tomczak et al.

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