METHOD AND APPARATUS FOR SOLENOID POSITION MEASUREMENT AND CONTROL

摘要

A method of control using the measurement of the inductance of the solenoid coil to predict the physical position of the armature within the stator coil. As the resistance of the windings will vary not only from unit to unit, but also with the temperature of the coil, it is preferable to continuously measure the resistance and compensate the calculations for the change in current. The use of solenoid position sensing through closed loop control of the sensing of the inductance and temperature produces highly accurate and repeatable control of the valve assembly.