A circuit for actuating an ABS solenoid valve coil with a pulse width modulated voltage having a constant frequency and variable duty cycle. The coil current is a function of the duty cycle of the pulse width modulated voltage. By controlling the duty cycle, current saturation of the coil can be avoided to provide for a faster response upon deactuation of the coil. Feedback is included in the circuit to verify correct functioning of electrical components.

Modulated voltage for a solenoid valve

A beverage mixing and dispensing valve, or a beverage dispenser including the valve, includes and automatic shut-off features. A user presses a cup or container against a lever (14) on a soft-drink dispenser. The lever closes a switch to activate the opening of a solenoid-operated valve (10). At the same time, a detection circuit is monitored to determine whether overflow of drink or foam has occurred. When drink or foam overflows and bridges a gap between two metal conductors (72) on the lever, resistance is lowered and electricity flows in the detection circuit. The valve then automatically shuts off the flow of beverage. Energy is saved in keeping the valve open using a pulse width modulation (PWM) technique for voltage to the solenoid, rather than using a steady-state voltage.

Beverage dispenser and automatic shut-off valve

When a “fully closed” instruction is received, a fixed soft landing commencement target position is set as the target degree of opening position of a drive control unit that controls feedback of drive of a DC motor (2), and, at a timing with which the difference between the actual degree of opening position and the soft landing commencement target position reaches a first threshold value, a target degree of opening position from which the soft landing commencement target position is gradually subtracted is set in the drive control unit.

Valve control apparatus and valve apparatus

A method and system for fine-tuning the motion of suction or discharge valves associated with cylinders of a reciprocating gas compressor, such as the large compressors used for natural gas transmission. The valve's primary driving force is conventional, but the valve also uses an electromagnetic coil to sense position of the plate (or other plugging element) and to provide an opposing force prior to impact.

Semi-Active Compressor Valve

An automatic system and method to provide the ignition and monitoring of a pilot flame for gas burners. The circuit includes a microcontroller that acts on at least one gas valve, a flame igniter, and a flame detector circuits. The valve driver is a switching circuit able to open the valve and keep it open with power saving. The flame detection uses the ionization principle with full use of the rectification property of a flame. Furthermore the flame detection is activated for reduced times to save power. The microcontroller governs the system according to the signals that it receives from points of the circuit. The system provides a circuit realizing advanced power saving techniques to provide also a long term operation on battery powered systems. In addition the automatic control can save gas resources versus traditional thermocouple based systems by applying the intermittent pilot ignition.

Automatic device for the ignition and control of a gas apparatus and relative driving method

With the system the movement a solenoid valve valving member is damped both during opening and during closure by delaying pulses applied during the movement of the valve mobile member, to reduce end-of-travel impact both during opening and during closure, and to reduce vibration and noise.

Control system for pulse width modulation-operated solenoid valves

of EP0800040The method consists of providing a portion (12) of greater cross-section in the gas feed conduit between the electromagnetic valve (2) and the diffuser (6) in a gas appliance, preferably for cooking or heating food.

Gas cooking appliance with a silenced burner stabilizing the flame, the burner being fed via a pulse width modulation-controlled electromagnetic valve

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Control system for pulse width modulation-operated solenoid valves

Gas cooking appliance with a silenced burner stabilizing the flame, the burner being fed via a pulse width modulation-controlled electromagnetic valve

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