Crusher load control system and self-organizing fuzzy controller (1)

During the crushing process, the load of the crusher is affected by the random variation of the ore supply, ore properties, etc., and the hysteresis is large. The application of the PID regulation system often fails to obtain good results. The application of fuzzy control theory can solve the above problems better and obtain better results.
(1) Self-organizing fuzzy controller and its working principle

The structure of a simple fuzzy controller is shown in the solid line of Figure 1. It is a common two-input and one-output fuzzy controller. The control rule is to summarize the experience and operational experience of a large number of operators on the control object.

The control table obtained by the above method is applied to the system, and the effect is poor. Because the system has more random operating conditions, the lag is greater. To this end, a self-organizing fuzzy controller that can automatically correct and improve the fuzzy control rules is designed. The performance test, control quantity correction and control rule correction are added to the structure, as shown by the dotted line in Figure 1. The hardware structure of this system is shown in Figure 2. After the current transformer detects the corresponding load current of the drive motor, it is converted into a corresponding DC voltage by the rectification filter to supply the ADA converter. The digital quantity Y output by the ADA is sent to the Z-80II type single board machine. The computer compares it with the given value S, and finds that the deviation e is sent from the entrance of the organization fuzzy controller. The self-organized fuzzy control table is used to obtain the thyristor firing angle a value of the feeder to trigger the power supply of the feeder. Control the silicon, output the corresponding voltage to adjust the feed amount of the feeder, to achieve the purpose of stabilizing the load of the drive motor of the crusher.

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