| 摘要 |
PURPOSE:To prevent the occurrence of abnormality such as lean spike, etc. At the time of low speed operation by carrying out integral control at a timing synchronous with rotation at the time of normal operation while at a timing nonsynchronous with rotation at the time of a low speed operation in an air-fuel ratio feedback control device. CONSTITUTION:The detected values from an air flow meter 4, air-fuel ratio sensor 12, and a water temp. Sensor 15, the ignition pulse form a distributor 17, etc. Are intputted into a fuel control circuit 13, and air-fuel ratio is feedback controlled to be target value in accordance with an operating condition. This fuel control device carries out integral control at a timing synchronous with rotation at the time of normal operation when the engine speed is above a defined value, while carrying out integral control at a timing nonsynchronous with rotation at the time of low speed operation when the synchronization of the integral control becomes above the maximum value.
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