Abstract: A system for optimizing power to a valve core movable between first and second positions includes a controller providing a control signal to the core. 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 to move the core to the second position, and with the hold voltage to retain it there. With the core in the second position, the controller measures a second self inductance, decreases the hold voltage, and measures a third self inductance representing the core's actual position. The controller determines, by comparing either the first or second self inductance with the third self inductance, whether the core is in the first or second position. If the core is in the second position, the decreased hold voltage is applied for retaining the core there.

Abstract: 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.

Abstract: A controlling and monitoring system for irrigation of localized areas of soil includes a water pipeline, a plurality of controllable irrigation valves, a plurality of field sensors measuring specific irrigation parameters, and a plurality of localized irrigation control units. Each of the control units has a sensor decoder connected to a specific one of the field sensors and a line decoder connected to a specific one of the irrigation valves. The system further includes a controller and power supply unit that applies a first alternating DC voltage signal to a two-wire cable interconnecting the controller and power supply unit and the control units. The cable provides power from the controller and power supply unit to each of the control units. The controller and power supply unit transmits schedules of instructions to the control units, and receives the irrigation parameters from the control units, through the cable.

Abstract: A two-wire controlling and monitoring system for irrigation of localized areas of soil includes a water pipeline, a plurality of controllable irrigation valves, a plurality of field sensors measuring specific irrigation parameters, and a plurality of localized irrigation control units. Each irrigation control unit has a sensor decoder connected to a specific field sensor and/or a line decoder connected to a specific controllable irrigation valve. The system further includes a controller and power supply unit that applies a first alternating DC voltage signal to a two-wire cable interconnecting the controller and power supply unit and the irrigation control units. The two-wire cable provides power from the controller and power supply unit to each of the irrigation control units, it transmits schedules of instructions to the irrigation control units through the two-wire cable, and it receives the irrigation parameters from the irrigation control units through the two-wire cable.

Abstract: A controlling and monitoring system for irrigation of localized areas of soil includes a water pipeline, a plurality of controllable irrigation valves, a plurality of field sensors measuring specific irrigation parameters, and a plurality of localized irrigation control units. Each of the control units has a sensor decoder connected to a specific one of the field sensors and a line decoder connected to a specific one of the irrigation valves. The system further includes a controller and power supply unit that applies a first alternating DC voltage signal to a two-wire cable interconnecting the controller and power supply unit and the control units. The cable provides power from the controller and power supply unit to each of the control units. The controller and power supply unit transmits schedules of instructions to the control units, and receives the irrigation parameters from the control units, through the cable.