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压电式阀门定位器在行程范围内动态特性是非线性的,传统5步开关法在控制阀门过程中存在超调和PWM控制脉冲个数偏多的缺点。研究提出带反向PWM降速功能的五步开关法,在闭环控制过程中根据执行器运行速度的大小进行正向PWM控制和反向PWM控制的切换;在参数自整定过程中,针对不同位置寻找相应的最佳正向PWM占空比,并实现任意位置最佳正向PWM占空比的实时计算。研制了基于MSP430F5418A低功耗单片机的硬件和软件系统,实时实现参数自整定和控制算法。针对不同的气动调节阀进行了实验,取得较好的控制效果。
The dynamic characteristics of the piezoelectric valve positioner in the travel range is nonlinear, the traditional 5-step switching method in the control valve there is overshoot and PWM control pulse number of disadvantages. In the process of closed-loop control, switching between forward PWM control and reverse PWM control is proposed according to the running speed of the actuator. In the process of parameter self-tuning, Look for the best forward PWM duty cycle and achieve real-time calculations of the best forward PWM duty cycle anywhere. The hardware and software system based on MSP430F5418A low-power single-chip microcomputer are developed, and the parameters self-tuning and control algorithm are realized in real time. Experiments were carried out on different pneumatic control valves to obtain better control effects.