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Boundary self-adaptation scheme for proportional poppet valve pressure control

  • US 6,692,088 B1
  • Filed: 09/26/2001
  • Issued: 02/17/2004
  • Est. Priority Date: 07/31/2001
  • Status: Expired due to Term
First Claim
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1. A method for adapting a closing boundary for a proportional poppet valve comprising:

  • (a) detecting a pressure command signal;

    (b) obtaining a pressure command derivative over time;

    (c) using the sign of the pressure command derivative over time to determine which closing boundary should be updated;

    (d) obtaining a pressure error by subtracting an actual wheel brake pressure from its pressure command;

    (e) calculating a modified pressure error;

    (f) implementing the modified pressure error in the estimation;

    (g) implementing an estimator to estimate a boundary deviation of the valve; and

    (h) updating a boundary table using the resultant boundary deviation estimate.

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