| 摘要 |
PROBLEM TO BE SOLVED: To improve the startability of a cylinder injection engine by raising fuel pressure to fuel pressure suitable for starting in an early stage of start. SOLUTION: In the cylinder injection engine, fuel pumped up from a fuel tank 11 by a low pressure pump 12, is pressurized by a high pressure pump 14 and is pumped to a fuel injection valve 28 since injection pressure need to be made high pressure for atomizing injected fuel. Fuel pressure need to be raised to pressure suitable for starting by the high pressure pump 14 in the early stage of start to improve startability. ECU 30 prohibits cylinder injection for a period established by elapse time, number of cycles (number of times of injection timing) or the like from cranking start, or until fuel pressure exceeds predetermined pressure at start. Consequently, cylinder injection can be started after securing sufficient fuel pressure in a short period of time and atomization of injected fuel can be accelerated from a beginning of injection start to improve startability. COPYRIGHT: (C)2008,JPO&INPIT
|
