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Adaptive object-sensing system for automatic flusher

  • US 6,691,979 B2
  • Filed: 12/04/2001
  • Issued: 02/17/2004
  • Est. Priority Date: 12/04/2001
  • Status: Expired due to Term
First Claim
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1. An automatic flusher comprising:

  • A) an electrical valve operable by application of control signals thereto between an open state, in which it permits water flow therethrough, and a closed state, in which it prevents water flow therethrough; and

    B) a control circuit that transmits radiation into a target region, detects radiation that as a result is reflected with a reflection percentage to the control circuit, and, in at least one mode of operation, responds to reflection-percentage changes independently of absolute levels of reflection percentage by so applying control signals to the electrical valve as to operate the electrical valve to its open state in response to a sequence of a period of decreasing reflection percentage meeting predetermined withdrawal criteria preceded by a period of increasing reflection percentage meeting predetermined approach criteria.

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