| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a common rail fuel injection device in which power is savely fed to a drive circuit part prepared commonly for a fuel injection valve and a pressure reducing valve. <P>SOLUTION: A control circuit 50 switches on/off of a MOSFET 36 to supply power from a common power supply system to the fuel injection valve and the pressure reducing valve according to injection signals and pressure reduction signals. As a reference for switching on/off of the MOSFET 36, the control circuit 50 has a voltage dividing circuit in which resistors 51, 52 are connected in series between a constant-voltage source Vcc and the ground to provide a voltage Vp equivalent to a peak current threshold. The resistor 52 is formed by connecting the resistors 52a, 52b in series to each other. The intermediate part of the emitters and the intermediate part of the collectors of a transistor 53 are so connected to each other parallel with the resistor 52b that the pressure reduction signals are input into the base of the transistor 53. <P>COPYRIGHT: (C)2008,JPO&INPIT |
