Current signature sensor
First Claim
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1. A method for insitu determining the health and performance of a solenoid valve comprising:
- processing an electrical current signature of the solenoid valve comprising, monitoring peaks and valleys of an electrical current of the solenoid valve and recording a time corresponding to each of the peaks and valleys, and recording the slopes and magnitudes of the electrical current;
comparing the electrical current signature with a historical or learned profile of the solenoid valve electrical current; and
providing a notification when out of specification conditions are encountered based upon the comparison.
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Abstract
A solenoid health monitoring system uses a signal conditioner and controller assembly in one embodiment that includes analog circuitry and a DSP controller. The analog circuitry provides signal conditioning to the low-level raw signal coming from a signal acquisition assembly. Software running in a DSP analyzes the incoming data (recorded current signature) and determines the state of the solenoid whether it is energized, de-energized, or in a transitioning state. In one embodiment, the software identifies key features in the current signature during the transition phase and is able to determine the “health” of the solenoid.
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Citations
16 Claims
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1. A method for insitu determining the health and performance of a solenoid valve comprising:
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processing an electrical current signature of the solenoid valve comprising, monitoring peaks and valleys of an electrical current of the solenoid valve and recording a time corresponding to each of the peaks and valleys, and recording the slopes and magnitudes of the electrical current;
comparing the electrical current signature with a historical or learned profile of the solenoid valve electrical current; and
providing a notification when out of specification conditions are encountered based upon the comparison. - View Dependent Claims (2, 3, 4)
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5. A monitoring system to determine a health of a solenoid valve comprising:
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a signal acquisition assembly having a magnetic sensor to translate a magnetic field produced by the solenoid valve during operation around it into an electrical output voltage, wherein the magnetic field represents an operating current of the solenoid valve;
a signal conditioner for providing signal conditioning to an output signal of the signal acquisition unit; and
a controller to perform real-time current signature analysis and trending of the conditioned output signal, wherein the controller monitors peaks and valleys of the conditioned output signal and records a time corresponding to each of the peaks and valleys, and records slopes and magnitudes of the conditioned output signal, the controller further compares the conditioned output voltage with a historical or learned profile of the solenoid valve, and provides a notification when out of specification conditions are encountered based upon the comparison. - View Dependent Claims (6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification