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Method and system for synchronizing control limit and equipment performance

  • US 6,947,801 B2
  • Filed: 08/13/2003
  • Issued: 09/20/2005
  • Est. Priority Date: 08/13/2003
  • Status: Expired due to Fees
First Claim
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1. A method of synchronizing equipment performance for a statistical process control system, comprising:

  • extending a chart model representation to have one or more chart properties, a control node, a control method and a process catalog;

    calculating a new consistent control limit based on statistical deviation of data defined by two or more control charts directed to the same process;

    assigning one or more consistent control limit to all control charts directed to the same process;

    selecting a synchronization frequency and updating the control charts with new control data in response to the selected synchronization frequency;

    calculating one or more new control limits based on the new control data assigning the new control limits to the control charts; and

    updating all control charts directed substantially to the same process and using at least one control chart during control of a process result.

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