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Ingredients belt weigher is a continuous totalizing automatic weighing instruments are widely used in various sectors of the people's livelihood, such as coal, chemical industry, metallurgy, building materials, food, batching scales of materials ratio to achieve cumulative amount of control, and the accuracy of the cumulative amount of control improve product quality, reduce production costs, improve labor efficiency. On the basis of access to information in English, first introduced the batching scale controller development at home and abroad, batching scales, integral structure works then made a presentation. Then according to the the batching scale flow control design requirements, design the the batching scales controllers AT91SAM7X256 microcontroller as the master chip. The controller uses a dual-channel data acquisition, prior to the channel and the rear channel of the sensor were measured weight of materials, when a channel fails, the batching scales still run normally. In addition the ADC converter CS5532 achieve purpose is to improve the measurement accuracy of the A / D converter. The combination of hardware circuit and the control algorithm, the batching scale controller software design. Due to the complexity of the entire controller software design, the design of FreeRTOS operating system transplantation to the microcontroller, mainly to complete the communication task, the weight of the sample task, PID control tasks, keyboard display, belt speed detection tasks seconds timing task, and the task of coordinating the various modules between work to subroutine reasonable allocation of space. The batching scale materials accumulated amount charged object, analysis of PID control and fuzzy control advantages and disadvantages. Fuzzy PID control, you can overcome the complex and changing environment of the batching scales, lag and other shortcomings, MATLAB SIMULINK simulation platform, the traditional PID control, fuzzy control, fuzzy PID control compared simulation study. Simulation results show that the fuzzy PID control is better than PID control. This article is primarily designed the batching scales controller hardware and software-based PID control algorithm, based on fuzzy PID control algorithm, real-time adjustment of the PID parameters, validate its control effect through simulation comparison. Designed based on the the batching scale controller hardware and software of the PID control, simulation studies control algorithm based on fuzzy PID control batching scales, technical preparations to increase the the batching scale controller metering accuracy. The subject from Shanxi Automation Instrumentation Co., batching scales controller design.
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