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Dynamic Weighing System Based on Embedded System

Author: BaiRenGang
Tutor: PanGang
School: Zhejiang University
Course: Control Theory and Control Engineering
Keywords: Weigh in Motion Embedded Systems FIR Dynamic compensation
CLC: TH715.1
Type: Master's thesis
Year: 2008
Downloads: 228
Quote: 0
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Abstract


In recent years, with the communication functions of the field of iron and steel, chemical and other industrial weighing systems, operator interface, anti-jamming performance and speed of response have become increasingly demanding, increasingly unsuited to traditional microcontroller as the core static weighing instrument. With the current embedded systems technology and dynamic weighing technology, this paper presents a fully embedded multi-tasking capabilities of the operating system and the module can be tailored functionality, dynamic weighing system based on embedded systems, execution efficiency, the amount of program code, communication processing ability has obvious advantages. Compared with the traditional weighing instruments, not only has the network communications capabilities and a graphical user interface, and has a good anti-interference performance and faster response. This system is based on the embedded system development, improve the system real-time and reliability from the start, a careful design and verification of hardware circuit and software systems, and the development of a dynamic weighing system based on S3C2410 platform and μC/OS- Ⅱ. The system is mainly composed of embedded microprocessors, communication module, on-site data input and output modules, the man-machine interface module. The communications module including network interface, RS-232 interface and RS-485 interface modules and industrial field bus interface, remote diagnostics, maintenance, settings and other functions. The field data input module load weight of the sensor signal, the output module can be used to generate control signals to control the production equipment. The man-machine interface module includes a touch screen and keyboard, provides a graphical user interface and keyboard input. Real-time and high reliability μC/OS- Ⅱ as the operating system, based on data acquisition and serial communication procedures, transplantation and graphical user interface μC / GUI and embedded TCP / IP protocol stack Lwip . In order to improve the anti-jamming capability to eliminate the presence of mechanical vibrations, electromagnetic radiation interference industrial field weighing system, the FIR filtering methods for sensor data processing. To improve system speed of response, mechanism analysis to establish the weighing system model, using the pole placement method for dynamic compensation of the weighing system to improve the dynamic characteristics of the system, greatly shorten the settling time of the system and improve the response speed of the system. After the test, the dynamic weighing instruments to meet the design requirements of the system anti-jamming performance and speed of response. Based on the above design, the dynamic weighing system can meet industrial production requirements for continuous line weighing, the embedded dynamic weighing system is the development direction of the industry dynamic weighing, has important practical significance and research value.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Measuring instruments > Quality measuring instruments > Weight measuring instruments
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