| 摘要 |
A system for optimizing the power to a movable valve core includes a controller for providing a control signal to the core, which is movable between first and second positions. With the core in the first position, the control signal has a hold voltage, and the controller measures a first self inductance. The control signal is provided with an inrush voltage for forcing the core from the first position to the second position, and then with the hold voltage for retaining the core in the second position. With the core in the second position, the controller measures a second self inductance, and it gradually decreases the hold voltage and measures a third self inductance representing the actual position of the core. The controller determines, by comparing one of the first and second self inductances with the third self inductance, whether the core is in the first or second position. If the core is in the second position, the gradually decreased hold voltage level is applied for retaining the core in the second position.
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