| Liquid level and temperature, as the important monitored factors in a thermal control process, the requirement for monitoring them in a manufactory process is increasing. At the same time the requirement for the controller’s performance and development efficiency is increased accordingly while the monitoring system is actually implemented. DSP chip with a powerful digital signal processing function and a variety of functional modes is increasingly widely used in the thermal control system.In this paper, use TMS320F28335DSP as a controller, to design a multivariable thermal monitoring system that makes a noninterference system for both liquid level and temperature. The main points of the research include building a hardware platform for a multi-volume thermal monitoring system and designing a monitoring process. The hardware platform of multi-volume thermal monitoring system is based on the experimental device of THJ-3 type thermal simulation system, composed of Pressure Transmitter, Pt100 RTD, temperature transmitters, DSP chip controller, simulated output modules and human-computer interaction terminal. The software of monitoring system design and development is based on CCS3.3 platform, using C language to write monitoring program that achieve:(1) choice of the controlling system; (2) collection liquid value and temperature signal; (3) display of thermal data; (4) the settings of the controlling factors and the output of the controlling value.By using the multivariable thermal monitoring system designed in this paper to control the THJ-3 type thermal simulation object control system for experiments of single-volume tanks, double-volume tanks and Fixed Value crucible monitoring system simulation. The results show that the multi-volume thermal monitoring system, using the thermal simulation object control system as. the control factor and the TMS320F28335DSP chip as the core controller, can well control the liquid value of the tanks and the temperature of the crucible liner. |
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