畢業(yè)設(shè)計單片機(jī)溫度控制英文文獻(xiàn)(文件)
【正文】 ocontroller An Interdisciplinary Undergraduate Engineering Design Project James S McDonald Department of Engineering Science Trinity University San Antonio TX 78212 Abstract This paper describes an interdisciplinary design project which was done under the authors supervision by a group of four senior students in the Department of Engineering Science at Trinity University The objective of the project was to develop a temperature control system for an airfilled chamber The system was to allow entry of a desired chamber temperature in a prescribed range and to exhibit overshoot and steadystate temperature error of less than 1 degree Kelvin in the actual chamber temperature step response The details of the design developed by this group of students based on a Motorola MC68HC05 family microcontroller are described The pedagogical value of the problem is also discussed through a description of some of the key steps in the design process It is shown that the solution requires broad knowledge drawn from several engineering disciplines including electrical mechanical and control systems engineering 1 Introduction The design project which is the subject of this paper originated from a realworld application A prototype of a microscope slide dryer had been developed around an OmegaTM model CN390 temperature controller and the objective was to develop a custom temperature control system to replace the Omega system The motivation was that a custom controller targeted specifically for the application should be able to achieve the same functionality at a much lower cost as the Omega system is unnecessarily versatile and equipped to handle a wide variety of applications The mechanical layout of the slide dryer prototype is shown in Figure 1 The main element of the dryer is a large insulated airfilled chamber in which microscope slides each with a tissue sample encased in paraffin can be set on caddies In order that the paraffin maintains the proper consistency the temperature in the slide chamber must be maintained at a desired constant temperature A second chamber the electronics enclosure houses a resistive heater and the temperature controller and a fan mounted on the end of the dryer blows air across the heater carrying heat into the slide chamber This design project was carried out during academic year 1996– 97 by four students under the authors supervision as a Senior Design project in the Department of Engineering Science at Trinity University The purpose of this paper is to describe the problem and the students solution in some detail and to discuss some of the pedagogical opportunities offered by an interdisciplinary design project of this type The students own report was presented at the 1997 National Conference on Undergraduate Research[1] Section 2 gives a more detailed statement of the problem including performance specifications and Section 3 describes the students design Finally Section 5 offers some conclusions 2 Problem Statement The basic idea of the project is to replace the relevant parts of the functionality of an Omega CN390 temperature controller using a customdesigned system The application dictates that temperature settings are usually kept constant for long periods of time but its noheless important that step changes be tracked in a reasonable manner Thus the main requirements boil down to 178。 quantization error in analogtodigital conversion of the measured temperature 178。以及在設(shè)定溫度值情況下可接受范圍內(nèi)的跟蹤階躍變化穩(wěn)態(tài)誤差超調(diào)量 設(shè)定溫度接口 范圍 精度 6099176。 C 室內(nèi)溫度顯示 范圍 精度 準(zhǔn)確度 6099176。 C 室內(nèi)溫度階梯響應(yīng) 范圍穩(wěn)定狀態(tài) 精度穩(wěn)定狀態(tài) 最大超調(diào) 設(shè)定時間到177。 1176。測量
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