Ferrer Herrera Manuel J.,Lurcott Steven M.,Roper Todd K.
申请号：
US201715445390
公开号：
US9964231(B2)
申请日:
2017.02.28
申请国别(地区):
美国
年份:
2018
代理人:
Fitch, Even, Tabin & Flannery LLP
摘要：
Some embodiments provide irrigation valve control apparatuses comprising: a solenoid configured to cooperate with a plunger; an input stimulus source coupled with the solenoid and configured to apply an input stimulus while a plunger drive signal is not being applied and that is sufficiently small to not cause the plunger to move; sampling circuitry configured to measure one or more voltage measurements corresponding to one or more voltages across the solenoid, wherein the one or more voltage measurements are dependent upon the current position of the plunger relative to the solenoid; and control circuitry cooperated with the sampling circuitry to receive the one or more voltage measurements from the sampling circuitry, wherein the control circuitry is configured to determine whether the plunger is in one of the open and closed positions based on the one or more voltage measurements.
