基于PID调节的恒温控制系统
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北京信息科技大学 传感器北京市重点实验室

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TP272

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Constant temperature control system based on PID control
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    摘要:

    MEMS加速度计在温度环境变化剧烈的情况下,测量精度受到很大影响,产生漂移误差,难以满足高精度导航的需求,因此迫切需要设计一种恒温电路,使加速度计长期工作在稳定的工作环境中,研究了在恒温情况下加速度计工作状态。针对恒温控制这一要求,设计了基于DSP2812的一种恒温控制电路,将传感器由加热电路和保温层包围,减少散热,提出了由DSP和高精度数字温度传感器TMP116相结合的软件控制系统,对PID控制进行深入研究,提出一种新的控制方式。最终输出PWM占空比、控制温度和检测温度数据,经实验测试,-40℃工作环境下,PID控制后系统超调量为1%,在两分钟内温度从57℃升温至70℃并稳定,稳定后满足温度精确控制在70±0.06℃,能够有效维持系统恒温。

    Abstract:

    When the temperature environment of the MEMS accelerometer changes drastically, the measurement accuracy is greatly affected, resulting in drift errors, and it is difficult to meet the needs of high-precision navigation. Therefore, it is urgent to design a constant temperature circuit to make the accelerometer work in a stable long-term In the working environment, study the working state of the accelerometer under constant temperature. For the requirement of constant temperature control, Aiming at the requirement of constant temperature control, a constant temperature control circuit based on DSP2812 is designed. The sensor is surrounded by heating circuit and insulation layer to reduce heat dissipation, a software control system based on DSP and high-precision digital temperature sensor TMP116 is presented. The PID control is deeply studied and a new control method is proposed. The experiment outputs PWM duty cycle, control temperature and detection temperature data, after experimental testing, at -40°C working environment, the system overshoot is 1% after PID control, and the temperature rises from 57°C to 70°C within two minutes and stabilizes. After stabilization, the temperature can be accurately controlled at 70±0.06℃, which can effectively maintain the system constant temperature.

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景希,高国伟.基于PID调节的恒温控制系统计算机测量与控制[J].,2021,29(4):110-114.

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  • 收稿日期:2020-09-14
  • 最后修改日期:2020-10-15
  • 录用日期:2020-10-15
  • 在线发布日期: 2021-04-25
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