Solenoid

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

Auto-calibration of a solenoid operated valve

Abstract: Operation of an electrically operated valve (20,22,34,36) is calibrated by applying a gradually increasing electric current (I c ) to the valve. While that is occurring pressure at either the inlet or outlet of the valve is measured to detect when the valve opens. When the valve opens the level of the electric current then being applied to the valve is employed to determine an initial current level (I INT ) to use subsequently whenever the valve is to be opened.

Model-based position control for a solenoid actuated valve

Abstract: An improved position control for a solenoid actuated valve, wherein the solenoid is activated based on the combination of a feed-forward component based on a model of the steady state operation of the valve and a closed-loop feedback component that responds to changes in the commanded position and compensates for any inaccuracy in the steady state model. The method involves a valve characterization procedure in which the actual force generated by the solenoid is measured for various combinations of valve position and solenoid current, resulting in a table of coil current in terms of developed force and valve position. In operation, the model is used to estimate the solenoid force required to achieve the commanded valve position under steady state operating conditions, and a controller addresses the table to obtain a feed-forward coil current command as a function of the commanded valve position and the estimated solenoid force. The feed-forward command is combined with a closed-loop feedback coil current command, which in turn, is used to develop a corresponding PWM duty cycle, given the solenoid temperature and the magnitude of the supply voltage.

Fault detection system and method for solenoid controlled actuators of a transmission system

Abstract: An improved system and method for detecting solenoid-related faults in a solenoid-controlled actuator assembly. The system includes a processing circuit which controls a solenoid driver circuit for energizing and de-energizing the solenoid, a current sense circuit for sensing the current in the solenoid, and a power supply switching circuit for selectively connecting and disconnecting a supply voltage from the solenoid driver circuit. The processing circuit implements fault detection logic wherein the processing circuit senses the current in the solenoid and, if the sensed current exceeds a predetermined current value for a predetermined time period, disconnects the supply voltage from the solenoid driver circuit and measures the rate of voltage decay in the solenoid driver circuit to determine if an open circuit fault or a short circuit fault exists.

Automatic carbonated beverage dispensing system

Abstract: This invention relates to an automatic beer dispensing system wherein an electrical circuit is actuated by a single selector control remote from the barrels containing the beer to simultaneously operate a solenoid valve to open a line from one barrel to a tap and another solenoid valve to open a line from a source of CO2 gas to the barrel being tapped and to thereafter successively operate corresponding solenoid valves to supply beer from other barrels and CO2 gas to each respective barrel then supplying the beer.