| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an accumulator fuel injection device allowing pressure reduction responsiveness to be improved while avoiding an undershoot regardless of the characteristics of a pressure control valve, upon reducing a common rail pressure during executing common rail pressure control in a supply amount control mode, and to provide a control device of the accumulator fuel injection device, the control device being capable of executing the above control. <P>SOLUTION: The control device executes first reduction control during executing a pressure control in a supply amount control mode, in which a control instruction value of a pressure control valve is determined in accordance with a basic target valve opening pressure obtained by adding a predetermined quantity to a target pressure, and upon reducing the pressure of a common rail, the control instruction value is changed to reduce the valve opening pressure of the pressure control valve than the basic target valve opening pressure. Further, if the pressure deviation reaches afterward a predetermined release threshold or more, the control device executes second reduction control of changing the control instruction value so as to further reduce the valve opening pressure than the valve opening pressure during the first reduction control. <P>COPYRIGHT: (C)2013,JPO&INPIT |
