×

Boundary adaptation scheme for spool valve pressure control

  • US 8,121,770 B2
  • Filed: 07/05/2007
  • Issued: 02/21/2012
  • Est. Priority Date: 07/31/2001
  • Status: Active Grant
First Claim
Patent Images

1. A method for adapting a closing boundary for a proportional spool valve comprising:

  • (a) generating a pressure command signal;

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

    (c) calculating a modified pressure error;

    (d) using an estimator to estimate an apply boundary deviation or a release boundary deviation of the spool valve, as appropriate; and

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

View all claims
  • 3 Assignments
Timeline View
Assignment View
    ×
    ×