Patent ID: 9134107
Filing Date: 2015-09-15
Classification: F16K,G01B,H01F

Abstract:
1. A method of condition monitoring a solenoid valve having a core bolt which can be shifted along an axial direction with respect to a double coil, wherein in a stationary switching condition of the solenoid valve, a first part of the double coil is used as a holding coil and a second part of the double coil is used as a measuring coil, and wherein the method comprises the following steps: a. surrounding a yoke bolt with measuring coil, surrounding a yoke plug and a core bolt with the holding coil, and providing yoke limbs to connect the core bolt and yoke plug to the yoke bolt, and wherein the core bolt is movable relative to the associated yoke limb, b. applying a reading voltage to the measuring coil, the reading voltage causing a change in current intensity of current flowing through the measuring coil, c. detecting a first measured value for a magnitude of the current intensity of the current flowing through the measuring coil at a first time during a switching-on or switching-off operation of the current flowing through the measuring coil caused by the reading voltage applied to the measuring coil, d. detecting a second measured value for the magnitude of the current intensity of the current flowing through the measuring coil at a second and later time during a stationary condition of the current flowing through the measuring coil, and e. comparing the first and the second measured values with predetermined reference values to determine a position of the core bolt with respect to the measuring coil.