Abstract: A clutch actuator for an electromechanical clutch having a solenoid actuating coil initially provides power to the solenoid at a high rate by using a high duty cycle pulse with a modulated controller. When the initial engagement of the clutch elements is sensed by a decrease in current, the duty cycle of the pulse width modulator is reduced and thereafter increased in a controlled fashion to accomplish a soft start.

Abstract: An impedance matching network includes a first input port that receives radio frequency (RF) power and includes an input impedance, an output port that provides the RF power and includes an output impedance, and a variable capacitance module that varies the output impedance. The variable capacitance module includes a first variable capacitor, a second variable capacitor, a first motor, and a second motor that adjusts a capacitance of the second variable capacitor. A relationship between a desired value of the capacitance and an actual value of the capacitance is dependent on a capacitance of the first variable capacitor.

Abstract: A clutch actuator for an electromechanical clutch having a solenoid actuating coil initially provides power to the solenoid at a high rate by using a high duty cycle pulse with a modulated controller. When the initial engagement of the clutch elements is sensed by a decrease in current, the duty cycle of the pulse with modulator is reduced and thereafter increased in a control fashion to accomplish a soft start.

Abstract: An impedance matching network includes a first input port that receives radio frequency (RF) power and includes an input impedance, an output port that provides the RF power and includes an output impedance, and a variable capacitance module that varies the output impedance. The variable capacitance module includes a first variable capacitor, a second variable capacitor, a first motor, and a second motor that adjusts a capacitance of the second variable capacitor. A relationship between a desired value of the capacitance and an actual value of the capacitance is dependent on a capacitance of the first variable capacitor.

Abstract: A clutch actuator for an electromechanical clutch having a solenoid actuating coil initially provides power to the solenoid at a high rate by using a high duty cycle pulse with a modulated controller. When the initial engagement of the clutch elements is sensed by a decrease in current, the duty cycle of the pulse width modulator is reduced and thereafter increased in a controlled fashion to accomplish a soft start.

Abstract: A clutch actuator for an electromechanical clutch having a solenoid actuating coil initially provides power to the solenoid at a high rate by using a high duty cycle pulse with a modulated controller. When the initial engagement of the clutch elements is sensed by a decrease in current, the duty cycle of the pulse with modulator is reduced and thereafter increased in a control fashion to accomplish a soft start.

Abstract: A method and apparatus for controlling a power supply. The system includes a power supply and a controller for outputting a command signal to regulate the operation of the power supply. The controller determines the command signal based on at least one error signal which is selected from a plurality of error signals based on a selection criterion.

Abstract: A method and apparatus for controlling a power supply. The system includes a power supply and a controller for outputting a command signal to regulate the operation of the power supply. The controller determines the command signal based on at least one error signal which is selected from a plurality of error signals based on a selection criterion.

Abstract: The present hot switching method and impedance matching circuit extends the tuning range of matching circuits to include increased power levels. The hot switching method and circuit includes coupling a controlled impedance network between an RF generator output and a plasma chamber input for matching impedances. The controlled impedance network includes an RF switch for switching a predetermined impedance. A device performance characteristic of the RF switch is determined. RF power is applied from the RF generator through the controlled impedance network to the plasma chamber. A signal characteristic of the impedance match is measured. The RF switch is controlled based upon the measured signal characteristic such that the impedance match is driven towards a predetermined matching range. The RF switch is switched any speed based upon the device performance characteristic.

Abstract: A flexible membrane variable orifice fluid flow meter which comprises a body, having a fluid conducting passageway therethrough, where the passageway has a first lateral width and second lateral width, and where the second lateral width is greater than the first, a backing bracket having a flat underside disposed within the second lateral width portion of the passageway perpendicularly to the direction of fluid flow and positioned so as to be superimposed over the first lateral width portion of the passageway, where the backing bracket has a lateral width less than the second lateral width but greater than the first lateral width of the passageway, a flexible membrane having head and toe ends, disposed between the flat underside of the backing bracket and the first lateral width portion of the passageway, and secured at its head end between the backing bracket and the body so that under conditions of zero fluid flow rate, the membrane obstructs the passageway across the second lateral width thereof, and diffe

Abstract: A fluid flow control system which can function under a range of input pressures for regulating the flow of fluid as a function of a variable input voltage and having a feedback feature which produces an electrical signal equivalent to the volume of fluid actually flowing from the control system, comprising a pressure balanced valve, a proportional solenoid having a movable shaft responsive to the input voltage and adapted to open the valve, said valve including, a fluid intake chamber having an intake port and a valve port, a fluid discharge chamber having a discharge port, a valve disk and a cooperating valve seat where the valve disk is connected to the shaft of the proportional solenoid so as to open and close the valve, a flexible diaphragm having a centrally disposed piston in contact with the valve disk a pressure equalizing chamber contiguous to the diaphragm, a biasing spring in contact with the piston and exerting a force thereon in a direction toward the valve disk for normally maintaining the valve

Abstract: A gaseous fuel delivery system for an internal combustion engine having at least one cylinder with fuel intake and exhaust gas ports and an ignition system and having a controlled air intake system for each of the cylinders of the engine which includes a source of gaseous fuel, a fuel plenum having at least one fuel atomizer nozzle for each cylinder of the engine, where each nozzle is in communication with the air intake system proximate the intake port in each cylinder, a fuel flow rate control device connected between the source of gaseous fuel and the fuel plenum which contains an electronic control unit having a plurality of optimum fuel/air mixture variables as inputs and a modulated pulse width output connected to a linear d.c. motor, the shaft stroke of which controls the operation of a fuel valve for regulating the flow of fuel from the gaseous source to the fuel plenum.