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Current signature sensor

  • US 6,917,203 B1
  • Filed: 08/29/2002
  • Issued: 07/12/2005
  • Est. Priority Date: 09/07/2001
  • Status: Expired due to Term
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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