A model-predictive collaborative control method for multi-zone temperature in a PDC drill bit sintering furnace

CN121578830BActive Publication Date: 2026-05-26WUHAN EASTAR TOOL
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Patent Information

Application Number
CN202610109967.6
Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Filing Date
2026-01-27
Publication Date
2026-05-26
Estimated Expiration
2046-01-27

AI Technical Summary

Technical Problem

Existing fixed-parameter models cannot adapt to the nonlinear time-varying drift of thermodynamic characteristics during the sintering process of PDC drill bits, resulting in model mismatch and decreased control performance, making it difficult to achieve high-precision and robust temperature control.

Method used

A time-varying state equation is constructed, and the model parameters are updated based on real-time temperature and heating power data. The change in heating power is optimized by recursive least squares method and cost function to achieve rolling optimization control of temperature in multiple zones.

Benefits of technology

It improves the model's adaptability to complex thermophysical processes, reduces the decline in control performance, enhances the accuracy and robustness of multi-zone temperature control in sintering furnaces, and improves the wear resistance and impact toughness of PDC drill bits.

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Abstract

This invention belongs to the field of industrial automation control technology, specifically relating to a model-predictive collaborative control method for multi-zone temperatures in a PDC drill bit sintering furnace. The method includes: constructing a time-varying state equation containing the temperature and heating power of each zone; using a recursive least squares method with a forgetting factor to update model parameters online based on real-time data; obtaining a cost function containing tracking error terms, collaborative constraint terms, and control constraint terms, and solving its minimization problem to obtain the optimal heating power change sequence; employing a rolling optimization strategy to calculate the heating power command based on the first element of the sequence and apply it to the power regulator to achieve collaborative control of multi-zone temperatures. This invention solves the problem that traditional fixed-parameter models cannot adapt to the time-varying drift of thermal characteristics and strong coupling in multiple zones during the PDC sintering process, improving the accuracy and robustness of temperature control.
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Citation Information

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