| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a fuel injection apparatus capable of attaining suppression of worsening of fuel consumption and discharge of HC and black smoke and prevention of uneven injection. <P>SOLUTION: This fuel injection apparatus is provided with an injector 5 having a needle valve 12 capable of opening/closing a nozzle hole 8, a pressure receiving chamber 13 applying nozzle hole closing valve force to the needle valve, and a fuel reservoir 6 applying nozzle hole opening valve force to the needle valve; a fuel supply means 9 supplying the fuel reservoir selectively with each pressurized fuel from a high pressure fuel supply part PH and a low pressure fuel supply part PL; a control oil pressure changeover means 58 supplying the pressure receiving chamber selectively with low pressure fuel in the low pressure fuel supply part PL and boosted fuel boosted by a boost mechanism part 30 as control fuel pressure PA; and an injector control valve 22 changing the needle valve to close by shutting off the pressure receiving chamber from an oil pressure discharge line 23 so that the nozzle hole closing valve force exceeds the nozzle hole opening valve force, and changing the needle valve to open by communicating the pressure receiving chamber 13 with the oil pressure discharge line 23 so that the nozzle hole closing valve force is less than the nozzle hole opening valve force. <P>COPYRIGHT: (C)2004,JPO |
