| 摘要 |
PROBLEM TO BE SOLVED: To improve fuel injection accuracy and form a fuel pump in small size, by providing the first/second pressure means pressurizing fuel supplied to a fuel rail, and controlling the second pressure means based on an operating condition of an internal combustion engine detected by a detection means. SOLUTION: Fuel in a fuel tank sucked by a fuel pump is pressure-governed by a pressure regulator to be forcedly fed to an active regulator 20. Here pressure governed pressure fuel, after a force feed to a delivery pipe, is injected into a cylinder of an engine from an injector by controlling of a circuit part 24. In the active regulator 20, a piezoelectric element 27 is protruded/deformed by applying voltage, so as to adjust capacity of a pressure adjusting chamber 26a, fuel is prevented from reversely flowing in the pump, by a check valve 22. By an ECU, a frequency, amplitude, etc., of applied voltage to the piezoelectric element 27, based on each sensor signal informing of an engine operating condition, are controlled. |
