| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fuel injection device capable of dissolving wax-clogging of a filter. <P>SOLUTION: The fuel injection device 1 includes a high-pressure pipe 20 for guiding high-pressure fuel flowing out of a common rail 4 by opening a decompression valve 13 to a filter 6 as a circulation flow passage for introducing a part of the high-pressure fuel from a high-pressure flow passage from a fuel supply pump 3 to an injector 5 into the filter 6. The decompression valve 13 functions as an introduction valve for introducing the high-pressure fuel into the circulation flow passage. The high-pressure 20 includes a check valve 25 and a circulation flow valve 26 from the upstream side. Thereby, valve-opening pressure of the check valve 25 is set comparatively high, and thereby the fuel in the high-pressure pipe 20 can be introduced into the filter 6 while keeping the pressure thereof at a high value. Thereby, the fuel can be introduced into the filter 6 in a further high-temperature condition, whereby wax-clogging can be surely dissolved. <P>COPYRIGHT: (C)2012,JPO&INPIT |
