基于代码生成的电控空气悬架系统电子控制单元

Electronic Control Unit of Electronically Controlled Air Suspension Systems Based on Code Generation

为提高某型SUV车辆的行驶平顺性、通过性等,对其进行空气悬架改装,并设计了由最小系统、车速信号调理模块、电动气泵控制模块、组合电磁阀控制模块、车身高度检测模块、CAN总线模块、车身加速度测量模块等组成的以Freescale XDP512为核心芯片的电控空气悬架系统电子控制单元,利用Real-Time Workshop(RTW)代码生成技术将所制定电控空气悬架系统控制策略转化为ANSI C代码并下载至电子控制单元,然后对安装电控空气悬架系统的试验车辆进行了车身高度与车速耦合试验、转向试验、急加速试验、急减速试验、平顺性试验,结果表明所设计的电控空气悬架系统控制单元能够实现车速信号调理、车身高度与车速耦合、电动气泵控制及组合阀控制等功能。

To improve a SUV＇ s ride quality and mobility, the SUV was modified using air suspension systems. An electronic control unit based on Freescale XDP512 microcontroller was designed including a minimum system, a speed signal conditioning module, an air pump control module, a combined valves control module, a body height measuring module and a CAN module, a body acceleration measuring module. The ANSI C code of the control strategy of the ECAS system was generated using Real-Time Workshop（RTW） code generation techniques, and then series of experiments of the car body coupling with speed, cornering, accelerating, decelerating, ride quality were conducted. The results of the experiments showed that the newly designed ECU could effectively finish the following functions： vehicle speed signal conditioning, the coupling of suspension height and vehicle speed, the control of an electrical air pump and a combination valves, etc.