| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a accumulator fuel injection device capable of suppressing the cost of its ECU by making common an SCV driving circuit and a pressure reducing valve driving circuit of conventional type. <P>SOLUTION: In a control logic to control the fuel pressure in a common-rail by the ECU, the pump discharge amount control to boost the fuel pressure in the common-rail from a low pressure to a high and the pressure reducing valve flow rate control (fuel circulating amount control) to reduce the fuel pressure in the common rail from the high pressure to the low are feedback controlled with the same control pulse signals emitted from the SCV and the pressure reducing valve driving circuit. That is, the process from the boosting to pressure reduction in the fuel pressure control can be controlled with the control flow rate characteristics for one driving amperage, so that the pressure controllability of the ECU can be enhanced. Making common the SCV driving circuit and pressure reducing valve driving circuit of conventional type allows simplifying the constitution of the output circuit of the ECU to lead to cost-down of the ECU. <P>COPYRIGHT: (C)2004,JPO |
