Patent ID: 7881035
Filing Date: 2011-02-01
Classification: F02D,F02M,F04B,H01F

Abstract:
1. A high-pressure fuel pump drive circuit comprising: a first switching element and a second switching element configured to manipulate an electric current to be passed to a solenoid coil configured to control a fuel discharge amount of a high-pressure fuel supply pump; a flywheel diode configured to consume a counter electromotive force that occurs at both ends of the solenoid coil when the first switching element is ON and the second switching element changes from ON to OFF; and a diode configured to consume a portion of a remainder of the counter electromotive force when the first switching element is also turned off, wherein the first switching element, the solenoid coil and the second switching element are connected in series in a route from a source voltage side to a ground side; the flywheel diode for passing an electric current to a power source is disposed in parallel with the solenoid and with the first switching element; a Zener diode as the diode is disposed in parallel with the second switching element so as to pass the electric current to the power source; and a feedback circuit comprising the solenoid coil, the flywheel diode and the Zener diode is formed when the second switching element is turned OFF and the first switching element is also turned OFF.