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首页 » 技术应用 » 带磁致伸缩位移传感器注塑机的系统总体框架
带磁致伸缩位移传感器注塑机的系统总体框架
立式注塑机控制系统采用ARM+DSP双核控制,ARM负责人机交互,DSP负责底层实际控制。磁致伸缩位移传感器 具有模拟电压信号,SSI和CAN等数字接口,本系统采用CAN接口,使DSP与多路位移传感器 构成CAN总线网络,通过编程可以实现对相应的位移进行定时采样,设置零点等,为立式注塑机精密控制提供了足够的采样精度。
下图为注塑机关于位置控制的系统框图,磁致伸缩位移传感器 将注塑过程中的位置、速度信号,如,开模位置、开模速度、射胶位置、射胶速度等转换为数字信号,通过CAN接口送入DSP控制器。DSP将位置信号通过串口发送给上位机进行实时显示,同时,根据传感器输出的位移和速度数据,控制DA输出和相应的开关输出,进而改变液压阀,从而达到位移和速度控制的目的。
本系统中的微处理器采用Ti的DSP和Atmel的ARM构成上、下位机系统。下位机系统以高性能的DSP为核心控制器,主频最高可达150MHz,并通过16位AD,DA转换芯片来实现系统的高精度、高速度。上位机系统以ARM为核心,提供键盘,显示屏等人机接口,方便用户操作。此外,系统外扩以I2C接口的EEPROM用于存储用户数据和系统参数,包括位移传感器零点、使用量程及其他注塑过程参数等,这些参数皆可以通过用户界面进行修改。