The simplified transfer function diagram block for a monitor automatic gauge control (Mon-AGC) system of strip steel rolling process was investigated. The new notion of strip sample length was given. In this way, the delay time varying with the roll-ing speed was evaded. After a Smith predictor was used to monitor the AGC system, the control laws were deduced for both propor-tional and integral regulators. The control strategies showed that by choosing the controller parameter P=∞ for both control algo-rithms each regulator could compensate the whole strip gage error in the first control step. The result shows that the integral algo-rithm is more controllable for the system regulating process and has a better steady-state precision than the proportional regulator. Compared with the traditional control strategy, the new control laws have a faster response speed and a higher steady-state precision.
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