ENGINE FUEL SUPPLY DEVICE

摘要

PROBLEM TO BE SOLVED: To prevent an engine from being operated at a lean air-fuel ratio due to the shortage of an actual fuel injection amount compared to a demanded amount even in a failure of a fuel pressure sensor.

SOLUTION: An engine fuel supply device determines a duty ratio for controlling the energization of a fuel pump based on fuel pressure detected by a fuel pressure sensor and based on a target value. When the fuel pressure sensor has an abnormality, the engine fuel supply device fixes the duty ratio of the fuel pump at a value corresponding to the target value, and cuts the fuel supply or limits an opening degree of a throttle valve under a high load that may cause the shortage of a fuel supply amount while the fuel pump is driven at the duty ratio corresponding to the target value.

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