往复式活塞气体流量标准装置控制器的研究

Research on a reciprocating piston gas prover controller

往复式活塞气体流量标准装置能扩展活塞装置的流量范围并延长有效检定时间,在简述该装置的结构和工作原理的基础上,针对原系统PLC控制器灵活性不足及ADC精度较低的缺点,提出了一种基于TMS320F2812的往复式活塞气体流量标准装置控制器.介绍了该控制器的硬件构成和软件框架,研究了ADC的校正措施进而提高了ADC精度,实现了伺服电机基于PWM输出的恒速控制和SPWM输出的变速控制.结果表明该控制器ADC的精度优于0.05%,并且易于实现复杂轨迹的运动控制,从而为往复式活塞装置开展深入研究奠定了基础.

The reciprocating piston gas prover can extend the verification flow range and prolong the verification time.A reciprocating piston gas prover controller based on TMS320F2812 was proposed to overcome the shortcomings of less flexibility of PLC controllers and low accuracy of ADC.The hardware structure and the software framework of the controller were introduced.The accuracy of ADC was improved by the correction measure.The output of PWM and SPWM which were controlling servo motor constant speed run and sine wave speed run were realized.The results showed that the error of the ADC was less than 0.05%,and it was easy to realize the complex track control,which laid the foundation for further research of the reciprocating piston gas prover.