| 摘要 |
PROBLEM TO BE SOLVED: To provide an internal combustion engine fuel supply system capable of further suppressing the step-out of a motor driving a fuel pump and the wear of a bearing and the like by exerting an appropriate feedback control to prevent the revolving speed of the motor from exceeding an upper limit revolving speed of the motor.SOLUTION: An internal combustion engine fuel supply system comprises: a fuel pump; a motor 22m driving the fuel pump; and control means determining a duty cycle of a control signal to the motor 22m under a feedback control so that a fuel pressure is closer to a target fuel pressure, the control means guarding an upper limit of the duty cycle by an upper limit guard value after determining the duty cycle on the basis of information on the pressure of a fuel discharged from the fuel pump and the target fuel pressure, capable of detecting or estimating a revolving speed of the motor 22m, and changing the upper limit guard value on the basis of the detected or estimated revolving speed of the motor 22m. |
