Movement detection circuit of solenoid shear seal valve on subsea pressure control system and method of detecting movement of solenoid actuator
AssigneeHydril USA Manfacturing LLC
InventorZhen Liu
Life of this patent
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Abstract
A solenoid current monitoring circuit of a solenoid actuator includes a solenoid drive board configured to receive a control signal, a sensing resistor configured to detect a current signal of a solenoid coil of the actuator resulting from the control signal, and a differentiator configured to differentiate the current signal. The solenoid current monitoring circuit detects the movement of the solenoid actuator based on a change in the differentiated current signal caused by a change in inductance of the solenoid coil.
Claims20
A solenoid current monitoring circuit of a solenoid actuator, the solenoid current monitoring circuit comprising:
- a solenoid drive board configured to receive a control signal;
- a sensing resistor configured to detect a current signal of a solenoid coil of the solenoid actuator resulting from the control signal;
- and
- a differentiator configured to differentiate the current signal,
- wherein the solenoid current monitoring circuit detects movement of the actuator based on a change in the differentiated current signal caused by a change in inductance of the solenoid coil.
A method of determining movement of a solenoid actuator, the method comprising:
- transmitting a control signal to a solenoid drive board of the solenoid actuator;
- obtaining a current signal from a solenoid coil of the solenoid actuator resulting from the control signal;
- differentiating the current signal to obtain a pulse, wherein the pulse is generated by a change in the differentiated current signal caused by a change in inductance of the solenoid coil upon movement of the actuator;
- and
- reporting the movement of the actuator based on detection of the pulse.
A computer readable medium for storing computer executable instructions, wherein the instructions, when executed by a processor, causes the processor to determine movement of a solenoid actuator, the instructions comprising;
- transmitting a control signal to a solenoid drive board;
- obtaining a current signal from a solenoid coil of the actuator resulting from the control signal;
- differentiating the current signal to obtain a pulse, wherein the pulse is generated by a change in the differentiated current signal caused by a change in inductance of the solenoid coil upon movement of the actuator;
- and
- reporting the movement of the actuator based on detection of the pulse.
A sub-sea pressure control system, comprising:
- a hydraulic flow path;
- a hydraulic valve in flow communication with the hydraulic flow path;
- a solenoid actuator connected to the hydraulic valve, the solenoid actuator being configured to operate the hydraulic valve;
- and
- a solenoid current monitoring circuit configured to monitor a current of the solenoid actuator, the solenoid current monitoring circuit comprising,
- a solenoid drive board configured to receive a control signal,
- a sensing resistor configured to detect a current signal of a solenoid coil of the actuator resulting from the control signal, and
- a differentiator configured to differentiate the current signal, wherein the solenoid current monitoring circuit detects movement of the actuator based on a change in the differentiated current signal caused by a change in inductance of the solenoid coil.
Dependencies are inferred from the claim text.