| 摘要 |
PURPOSE:To improve operation efficiency at a high load by carrying out air-fuel ratio feedback control on an oxygen sensor when a fuel feed amount is less than a standard, and making correction for rich fuel when said amount continues to be over the standard for more than a predetermined time. CONSTITUTION:A control circuit 16 is inputted with the detected values of a throttle valve opening sensor 10, an absolute pressure sensor 11, a cooling water temperature sensor 12, a crank angle sensor 13 and an oxygen density sensor 14 respectively. The control circuit 16 makes judgement s to whether the open time of an injector 15 is over a standard level, when the oxygen density sensor 14 is activated, cooling water temperature is over a predetermined value and the throttle valve opening exceeds a predetermined level. When said valve continues to be open over the predetermined level for a predetermined time, the control circuit 16 stops the feedback control of an air-fuel ratio on the basis of the detected value of the oxygen density sensor 14, and makes correction for making fuel rich.
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