| 摘要 |
<p>A solenoid valve includes a solenoid coil and a valve stem positionable with respect to the solenoid coil. A transient response produced by the solenoid coil upon varying an energization state of the coil is measured to analyze various characteristics of the solenoid valve. In one embodiment, an excitation pulse is applied to the solenoid coil and is preferably of a duration sufficiently short so as to not actuate movement of a solenoid valve stem. A transient response of the solenoid coil is monitored following application of the excitation pulse to measure a rise time, decay time and/or transition time of the current of voltage across the solenoid coil. The rise time, decay time, and/or transition time of the current or voltage across the solenoid coil varies as a function of an inductance of the solenoid coil. The inductance of the solenoid coil, in turn, varies as a function of a position of the valve stem with respect to the solenoid coil. Accordingly, a position of the valve stem is determined based on measuring a transient response of the solenoid coil to the excitation pulse.</p> |
