| 摘要 |
PROBLEM TO BE SOLVED: To improve linearity in "actual injection amount versus injection command time period".SOLUTION: When a nozzle needle 43 exists at a full lift position, a nozzle high-pressure communication passage 433 and a cylinder high-pressure communication passage 441 are communicated, a fuel reserving chamber 413 and a needle control chamber 46 are kept in a communicated state through the nozzle high-pressure communication passage 433 and the cylinder high-pressure communication passage 441, and lowering of a pressure of the needle control chamber 46 is prevented. By keeping the pressure of the needle control chamber 46 to be a prescribed pressure or more, a valve closing state of a high-pressure control valve 48 is kept, and hunching of the high-pressure control valve 48 is prevented. Accordingly, dispersion in the position of the high-pressure control valve 48 in closing a discharge control valve 47, is eliminated, and further dispersion in a time period from the closing of the discharge control valve 47 to start of movement in the valve closing direction, of the nozzle needle 43 is eliminated, thus the linearity in "actual injection amount versus injection command time period" can be improved. |
