Process and device for automatic determination of parameters for process control systems with unknown transfer behavior, in particular for process control systems for resistance spot welding

Patent 5192845 Issued on March 9, 1993. Estimated Expiration Date:

July 26, 2011. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.

Abstract Claims Description Full Text

Patent References

3546421

Resistance spot welder process monitor Patent #: 4596917
Issued on: 06/24/1986
Inventor: Nied , et al.

Inventors

Application

No. 721425 filed on 07/26/1991

US Classes:

219/110Controlled in response to current, voltage, or temperature

Examiners

Primary: Shaw, Clifford C.

Attorney, Agent or Firm

Notaro & Michalos

Foreign Patent References

3711771 DE. 10/13/1988
3743892 DE. 12/13/1988

International Class

B23K 011/24

Foreign Application Priority Data

1989-10-27 DE

Abstract

A process and a device for automatic determination of parameters for process control systems with unknown transfer behavior are useful for controlling special technical processes in which a functional relationship between process input and process output variables is unknown, at least in parts, while maintaining the properties of the output variables (target functions) within certain acceptable limits. To this end, measured values obtained by the process are subjected to statistical analysis from which control parameters such as theoretical value functions and weighting factors are derived automatically and incorporated in a universally applicable control specification. The control specification is used to determine the control parameter. Adaptation to different processes as well as suitability tests for various control parameters for process control can be carried out comparatively simply using predetermined calculation procedures, conversion factors or the like.