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 that includes a solenoid that is supplied with driving current to generate magnetic flux, and a valve element that is moved by the magnetic flux generated from the solenoid; and a control device that controls the solenoid valve. 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, and detects an impedance of the solenoid.

主权项

1. A solenoid valve device, comprising:
a solenoid valve that includes a solenoid that is supplied with driving current to generate magnetic flux, and a valve element that is moved by the magnetic flux generated from the solenoid; and a control device that controls the solenoid valve, wherein 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, and detects an impedance of the solenoid, and the control device changes a magnitude of the driving current based on the impedance; wherein the control device sets a relationship between the driving current and the impedance at a time when the driving current matches an operation of the valve element as a reference position index, and stops supply of the driving current to the solenoid when a relationship between the driving current supplied to the solenoid and the impedance detected as the driving current is supplied differs from the reference position index.