| 摘要 |
PROBLEM TO BE SOLVED: To suitably maintain lubricity of a plunger sliding part at a time of use of low viscosity fuel and prevent wear and seizure of the plunger sliding part by adopting necessary amount of lubricity improving means to maintain lubrication of a plunger sliding part on the low viscosity fuel in corresponding to engine operation conditions and temperature and viscosity condition of fuel. SOLUTION: In an internal combustion engine provided with fuel injection device pumping low viscosity fuel supplied by a fuel injection pump to a fuel injection valve, a lubricity improving agent supply means adding lubricity improving agent to low viscosity fuel supplied to the fuel injection device, and a controller controlling the lubricity improving agent supply means to increase adding amount of the lubricity improving agent as revolution speed of the engine or engine load rises and fuel injection pressure of low viscosity fuel increases are provided. COPYRIGHT: (C)2006,JPO&NCIPI
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