| 摘要 |
<P>PROBLEM TO BE SOLVED: To improve injection quantity control accuracy in a partial lift area (an area of becoming a partial lift state where a lift quantity of a valve element does not reach a full lift position) of a fuel injection valve of an engine. <P>SOLUTION: When a predetermined learning execution condition is met, partial lift injection for driving the opening of a fuel injection valve 21 by an injection pulse that causes a partial lift state in which the lift amount of a valve element of the fuel injection valve 21 does not reach a full lift position is executed, and the integral value of a drive current that flows to a drive coil of the fuel injection valve 21 after the injection pulse of the partial lift injection is turned off is calculated. By calculating the inductance of the drive coil in consideration of the direct current superposition characteristic of the drive coil on the basis of the integral value of the drive current, the inductance is accurately calculated, and by estimating the lift amount of the valve element on the basis of this inductance, the lift amount is accurately estimated. By correcting the injection pulse of the partial lift injection on the basis of this lift amount, the injection pulse is accurately corrected. <P>COPYRIGHT: (C)2013,JPO&INPIT |
