| 摘要 |
PROBLEM TO BE SOLVED: To improve fuel injection control accuracy of a cylinder injection engine. SOLUTION: A fuel pressure correction factor KP for correcting a difference in a fuel injection quantity by a change in fuel pressure and a load, is determined by calculating the fuel pressure correction factor KP corresponding to present fuel pressure and a load. An operation state correction factor KT for correcting a difference in the fuel injection quantity by a change in an inside-outside temperature difference (a temperature difference between a housing tip part and a needle valve) of a fuel injection valve 21 when changing to a present engine operation state from a reference operation state, is determined by calculating the operation state correction factor KT corresponding to a difference between the present engine operation state (for example, the present cooling water temperature) and the reference operation state (for example, the reference cooling water temperature of adapting the fuel pressure correction factor KP). An injection pulse width TAU of correcting a difference in the fuel injection quantity by a change in the fuel pressure and the load and a difference in the fuel injection quantity by a change in the inside-outside temperature difference of the fuel injection valve 21, is determined by using these fuel pressure correction factor KP and operation state correction factor KT. COPYRIGHT: (C)2007,JPO&INPIT
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