| 摘要 |
This electromagnetically driven control valve is provided with: a housing having therein a high pressure passage that is in communication with a hydraulic pressure supply source, a low pressure passage that is in communication with a tank, at least one port that is in communication with an actuator that is being driven, and a spool hole that is in communication with said high pressure passage, low pressure passage and port; a spool valve body that can move back and forth inside the spool hole of said housing; a solenoid for drawing a plunger to a coil by passing electricity through the coil and pressing and driving the spool valve body using the plunger; an electric power source device for superposing a direct current for driving the spool valve body on an alternating current for preventing sticking of the spool valve body and applying same on the coil of the solenoid; an induced reactance detection unit for detecting induced reactance of the coil of the solenoid; and a position detection unit for determining the position of the solenoid plunger on the basis of the induced reactance detected by said induced reactance detection unit. |
