CONTROL DEVICE

The invention provides a control device, and the control device is provided with a maximum detection unit that detects a maximum point when changing from an increase to a decrease by backtracking time-series data of a differential value of a back electromotive force generated in a solenoid in the direction opposite to the time-series data; and a valve closing time detection unit that executes a determination process for backtracking the time series data in the opposite direction from the maximum point detected by the maximum detection unit, and scanning whether or not the reduction amount of the differential value from the maximum point exceeds a predetermined threshold value. When there is an event in which the amount of decrease exceeds the predetermined threshold value, a maximum time, which is the time of the maximum point, is detected as a valve closing time of the fuel injection valve. 本发明的控制装置包括：极大检测部，将在螺线管中产生的反电动势的微分值的时间序列数据向与时间序列相反方向回溯，检测从增加变化为减少时的极大点；以及闭阀时间检测部，执行从由所述极大检测部检测出的所述极大点，将所述时间序列数据沿所述相反方向回溯