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The Design and Research of Temperature Regulator Based on Embedded System

Author: DongHui
Tutor: YangJingChang
School: West China University
Course: Power Electronics and Power Drives
Keywords: ARM temperature measure temperature control PID
CLC: TH811
Type: Master's thesis
Year: 2009
Downloads: 268
Quote: 2
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Abstract


Temperature is the physical quantity which measures the extent of objects’ hot and cold. It is one of the seven fundamental physical quantities of the international system of Units (SI), and is an important parameter of industrial quality and industrial process. Almost scientific all of researches and production process are closely related to it. Temperature measure and control technology is a quite important industry technology and researching program which is applied not only to high-tech field such as chemical industry、medical treatment、avigation, but also to people’s daily life. So, accurate measuring and effective controlling of temperature is the primary condition for high quality and productivity, low energy consumption and safety in production. Accordingly, the purpose of design and research of temperature regulator based on embedded system is to detect whether the accuracy of temperature controller reaches the people’s expected effect.The temperature regulator which is composed of temperature measure, temperature control, temperature regulation, heater and temperature display is temperature measure and control system based on MCU ARM7LPC2104.The temperature measure and control is the most important part of the whole system.Pt100 temperature thermal resistance with A grade precision is chosen as the sensor of temperature measuring sector. Improved three-line measuring circuitry is also adopted. This sector puts detected temperature signals into voltage signals. By using voltage amplifier, it amplifies those weak signals and thus transmits them to the main controlling part.The temperature control part adopts MCU ARM7LPC2104 PID control which belongs to digital PID control. The control principle of MCU ARM7LPC2104 PID control is roughly similar to simulant PID control, but they realize in the different ways. In the digital PID control system of MCU ARM7LPC2104, for the sake of achieving the error of transmitting to the MCU ARM7LPC2104, the measuring value transmitted from temperature measure part is translated digital signals after ADC and compared with the value set. Based on MCU ARM7LPC2104’s calculation procedures, the result adjust the width of MCU ARM7LPC2104’s export of PWM signals. The width of PWM controls the time range of "off" or "on" state of solid state relay so that it could adjust the power of heating of temperature regulator. The characteristics have high control accuracy and high degree of automation, but the parameters of P,I and D can not be arbitrarily changed. Using the MCU ARM7LPC2104 PID control, the temperature can be controlled within the range of 20℃～150℃with a precision of±0.5℃and uninterrupted adjustability of temperature setting is realized.The temperature heater part makes use of resistance furnace to provide source of heat. According to the state of "opening" or "closing" of solid state relay controlled by MCU ARM7LPC2104 alters the power of heater so that the temperature reaches the set temperature of gas cavity in the temperature regulator.Temperature display sector receives and show the temperature data such as the value set and the coinstantaneous value that is disposed by MCU ARM7LPC2104’s procedure through LCD screen.The temperature regulator based on embedded system has several traits as follows:(1). High degree of automatization.(2). Advanced hardware technology and design in reason.(3). The blocking frame was adopted by system. (4). High degree of standardization.(5). High precision in temperature controlling.

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CLC: > Industrial Technology > Machinery and Instrument Industry > Instruments, meters > Thermal measuring instruments > Temperature measuring instruments
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