Solenoid valve device, hydraulic apparatus equipped with the solenoid valve device, and hydraulic power steering system equipped with the hydraulic apparatus

摘要

A solenoid valve device includes: a solenoid valve (70) that includes a solenoid (75) that is supplied with driving current to generate magnetic flux, and a valve element (74) that is moved by the magnetic flux generated from the solenoid (75); and a control device that controls the solenoid valve (70). The control device includes an alternating current component in the driving current and supplies the driving current including the alternating current component to the solenoid (75), and detects an impedance of the solenoid (75).