Control device, control program, and control method

Abstract

Fuel is injected at the appropriate timing, taking into account the effects of core oscillation. [Solution] The processor of the control device (21) acquires multiple sample values ​​(D0 to D7) of the applied voltage, calculates the degree of variation of the multiple sample values, extracts feature points from the waveform of the degree of variation corresponding to the reference timing, estimates the behavior of the valve body based on the feature points, and estimates at least two timings as feature quantities of the behavior of the valve body and the movable core: the valve closing timing (Tc0) when the valve body closes and the process is completed after fuel injection, the first initial core position timing (Tc1) during the oscillation of the movable core which starts after the movable core has reached the reference initial core position (CIP) when the movable core returns to a stationary state after the valve body closes, and the subsequent n (n is a natural number of 1 or more) initial position timings.