| 摘要 |
PROBLEM TO BE SOLVED: To provide a stable idle running state by a method wherein, in the idle operation state of an engine, the target value of a rail pressure to decide a fuel injection pressure is decided based on the temperature of working fluid. SOLUTION: A target working fluid pressure Prt when an idle deciding means 33 decides that the operation state of an engine is an idle operation state forms an output from a second target rail pressure calculating means 32 decided based on an oil temperature To related to viscosity of oil. Since a pressure control valve 64 effects feedback control such that a rail pressure Pr fed to an injector is adjusted to a target working fluid pressure Prt, in an idle operation state, an influence on the fluctuation of the number of revolutions of an engine by the change of viscosity of oil is prevented and a stable idle operation state is provided. |
