Solenoid

About: Solenoid is a research topic. Over the lifetime, 19278 publications have been published within this topic receiving 114721 citations.

Engine and fuel shutdown control

Abstract: A solenoid-operated fuel valve opens automatically when the engine is started to allow fuel to flow from a fuel tank to the engine and closes automatically when the engine throttle is moved to fuel-off position to shut down flow of fuel through the governor for the engine. In the event of an emergency, operation of a manual shutdown control will de-energize the fuel valve solenoid to shut off flow of fuel to the engine compartment and will also shut down the engine by energizing a solenoid to move the fuel rack for the governor to fuel-off position. Actuation of a fire-extenguisher system for the engine will automatically de-energize the fuel-valve solenoid and energize the fuel-rack solenoid. The fuel-rack solenoid remains energized for a timed period sufficient to ensure engine shutdown in emergency situations. Control circuits are provided to ensure that current to each of the solenoids is reduced to a low holding level after initial energization and pull-in of the solenoids and are also provided to protect against damage from excessive current in the event either solenoid is shorted.

Method and apparatus for providing autoranging for an AC/DC power management circuit for DC solenoid actuators

Abstract: A method for providing a power management for a DC solenoid actuator includes the steps of initially supplying a first number of DC current pulses to the actuator and after a first time interval reducing the number of pulses applied to the solenoid in direct proportion to an output voltage of a source of the DC power. The method further includes the step of changing the duration of the first time period in direct proportion to the output voltage of the source of the DC power. An apparatus utilizing this method includes a timer for selectively providing a sequence of current pulses, circuit means for applying the pulses to a DC operated electromagnetic solenoid, power supply means responsive to an input voltage for supplying DC power to the timer means and compensating means for controlling the timer means to reduce the number of pulses applied to the solenoid after an initial maximum number of pulse applications during a first time period by changing the off time between the reduced number of pulses in direct proportion to the magnitude of the input voltage to maintain a predetermined average current in the solenoid during the time of the reduced number of pulses and being responsive to the input voltage for changing the duration of the first time period in direct proportion to the magnitude of the input voltage to maintain a predetermined average current in the solenoid during the first time period.

Twin tower assembly for decontaminating compressed gas

Abstract: A twin tower assembly for decontaminating compressed gas, each tower having inlet, outlet, drain and solenoid valves of which the inlet and drain valves are separately connected directly to the solenoid valve and actuated respectively to close and open by actuating gas supplied and exhausted through the tower's solenoid valve, the towers by alternate energizing of their solenoid valves under timer control and actuation of their inlet and drain valves each normally alternating between decontaminating and regenerating cycles and together alternating in their decontaminating cycles for supplying a continuous output of decontaminated gas, the inlet and drain valves of each tower being so relatively constructed that actuating gas supplied at the same pressure at the solenoid valve exerts a greater force differential for closing the inlet valve than for opening the drain valve and ensures that in cycling the inlet valve will close before opening and open after closing of the drain valve. Passage-connected outlet chambers in the towers enable each tower during a decontaminating cycle to supply decontaminated regenerating gas to the other tower at a flow rate and reduced pressure predetermined by the size of a restricted orifice in the connecting passage and each tower removably houses in advance of its outlet chamber a canister containing and shippable loaded with a particulate desiccant and mounting upstream of the desiccant an oil coalescer.

Apparatus having automatic re-set means for detecting a fault current

Abstract: A device for detecting fault current. The device senses the current in a line and converts it to a proportional voltage signal. The voltage signal is used to switch a solenoid to first and second positions depending upon the value of the signal. The device will re-set itself after sensing a fault current when normal line current is restored.

Development of Central Solenoid for JT-60SA

Abstract: Several components for central solenoid (CS) of JT-60 Super Advanced (JT-60SA) were newly developed and tested. The butt-type joint, the electrical resistance of which is about 2 nΩ, was developed to increase the winding diameter. The insulation system, which consists of Glass/Kapton/Glass tape and Bisphenol A diglycidyl ether (DGEBA) epoxy, showed sufficient tensile strength after the irradiation of 100 kGy. Insulation characteristics of 4 × 4 winding stack sample after the compression of 705 kN 36 000 times was able to withstand voltages larger than 21 kV. The heat treatment and transfer of the CS model coil with superconductor were conducted. The pancake temperature during flat top was maintained at 923 ± 4 K. The maximum temperature difference in the pancake was 30 K. All manufacturing processes were confirmed so that the mass production of CS will be started in 2013.