| 摘要 |
PROBLEM TO BE SOLVED: To accurately correct irregularity in an injection amount of partial lift injection for driving a fuel injection valve to be opened by an injection pulse for which a lift amount of a valve element of the fuel injection valve does not reach a full lift position.SOLUTION: After at least an injection pulse for partial lift injection is turned off, a negative terminal voltage Vm of a fuel injection valve is filtered by a first low-pass filter that sets a first frequency f1 lower than a frequency of a noise component as a cutoff frequency to calculate a first filter voltage Vsm1, and the negative terminal voltage Vm is filtered by a second low-pass filter that sets a second frequency f2 lower than the first frequency f1 as a cutoff frequency to calculate a second filter voltage Vsm2. Time required from predetermined reference timing until timing at which a filter voltage difference Vdiff(=Vsm1-Vsm2) is an inflection point is calculated as voltage inflection point time Tdiff, and the injection pulse for the partial lift injection is corrected on the basis of this voltage inflection point time Tdiff. |
