| 摘要 |
The start up fuel control device according to the present invention controls the fuel supply amount to an engine during the cranking operation. After the cranking operation starts, the device measures the time lapsed since the cranking operation started. Further, the measured time is stored in a backup RAM which can preserve the content of its memory even if a main switch of the engine is turned off. Since the time lapsed from the beginning of the cranking operation (cranking time) can be considered as a parameter representing the amount of unburnt fuel remaining in the cylinder, the device performs the following operation based on the cranking time to prevent the air-fuel ratio of the air-fuel mixture in the cylinders becomes too low (rich) for firing to occur. When the cranking time exceeds a predetermined period, the device starts a scavenging operation in which the fuel supplied to the engine is reduced in order to expel the fuel remaining in the cylinders by the cranking operation. After performing the scavenging operation for a predetermined period, the device increases the fuel supplied to the engine until it reverts to the value before the scavenging operation started.
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