| 摘要 |
PROBLEM TO BE SOLVED: To obtain an accumulator chamber pressure in the fuel injection start timing from an approximate function obtained to be based on a pressure of operating fluid in an accumulator chamber detected by a fixed sampling period, accurately control an operating period of an operating fluid control valve of an injector. SOLUTION: Based on a plurality of detection values Pr1 to Pr2 obtained by a fixed sampling period Ts relating to an accumulator chamber pressure, an approximate function Pr(t) of accumulator chamber pressure is obtained. By the approximate function Pr(t), a preset value Prs of accumulator chamber pressure in the fuel injection timing Tinj is obtained, based on the preset value Prs, a control valve drive period necessary for executing a target injection amount is obtained, during this drive period, by operation of a controlled control valve, a pressure of operating fluid is utilized, fuel is injected from an injector. |
