基于PID调节的恒温控制系统

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的工作状态;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。

Constant temperature control system based on PID control

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 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℃working environment,the system overshoot is 1%after PID control,and the temperature rises from 57℃to 70℃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.