| 摘要 |
PURPOSE:To aim at securing fuel injection even when battery voltage has dropped, with regard to a fuel injection valve that the higher the fuel pressure gets the higher the required battery voltage gets to open the valve, by making the fuel pressure drop when the battery voltage has dropped lower than the preset value. CONSTITUTION:A fuel injection valve 9 is connected to a low pressure pump 14 inside a fuel tank 13 through a fuel feeding pipe 12 after it is connected to a high pressure pump 11 through a fuel distribution pipe 10 to inject fuel into a combustion chamber 4 of an internal combustion engine 1. On the other hand, the fuel injection valve 9 is connected to a battery 57. The fuel injection valve 9 and the high pressure pump 11 are respectively controlled by an electronic control unit 50 based on respective detection signals from a voltage sensor 58 of the battery 57, a fuel pressure sensor 60 of the fuel distribution 10 and the like. Now, the higher the fuel pressure gets the higher the voltage of the battery 57 gets to open the valve of the fuel injection valve 9. In this case, the fuel pressure is lowered when the voltage of the battery 57 drops below the set voltage. |
