| 摘要 |
PURPOSE: A current is generated by a duty ratio to drive a fuel pump, thereby a regulator and a return rail is not necessary. CONSTITUTION: A fuel pump control system comprises a car speed sensing portion(10), an engine rpm sensing portion(20), a fuel pump(50) to supply fuel, an electronic control unit(30) calculating injecting fuel amount according to the car speed and engine rpm and outputting duty signal corresponding to the calculated fuel amount, a fuel pump driving portion(40) driving fuel pump converting the duty signal to a current.
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