Patent attributes
To provide a fuel pump control device allowing a fuel pump having a small capacity to feed a sufficient amount of fuel to an internal combustion engine. During running of a vehicle at a low speed (for example, less than 2,0 km/hr), pulsed drive voltages are intermittently supplied to a fuel pump in accordance with each opening/closing of a thyristor on the basis of ignition pulses of the engine. In this way, the fuel pump repeats discharge operation at a relatively long cycle in synchronization with the pulsed drive voltages. During running of the vehicle at a high speed, a drive voltage is continuously supplied (that is, a DC voltage is supplied) from a power supply line to the fuel pump, whereby the fuel pump repeats discharge operation at a cycle with a short self-excitation state.
