许多早期汽车的电动车窗不具备车窗防夹功能，致使车窗夹人事故时有发生。因此，论文设计了一种车窗防夹系统，可以在原电动车窗基础上，仅更换电动车窗的控制器，实现车窗的防夹功能。论文选题具有重要的应用价值。

论文讨论了车窗防夹系统的设计方案，给出了以ARM为核心的硬件系统，包括电机运行控制、纹波信号检测、传感器信号检测和断电检测等电路，专门设计了纹波信号隔离器，解决了四个车窗运行时产生的纹波干扰问题；采用检测纹波信号周期的方法，实现了车窗位置和车窗运行力度的检测；给出了四车窗防夹系统的程序流程，详细设计了按键信号检测、车窗静止/上行/下行处理等模块，实现了具有防夹功能的车窗运行控制。为适应不同的车窗环境，设计了学习处理模块，获取车窗运行的关键参数；在发生危险和异常情况下，论文设计的车窗防夹系统也可以及时进行处理；在系统断电的瞬间，系统可以保存车窗的运行状态，恢复供电后，仍可以实现车窗运行控制和防夹功能。

论文对车窗防夹系统进行了实际测试：车窗运行与防夹功能、车窗运行关键参数学习、断电时的车窗状态保存功能，结果表明，车窗防夹系统达到了设计要求。

The power windows of many early cars did not have the function of window anti-pinch, which caused the accidents of window-pinch. Therefore, this paper designs a window anti-pinch system, which can only replace the controller of the power window on the basis of the original power window to achieve the anti-pinch function of the window. The topic selection of this paper has important application value.

       This paper discusses the design scheme of window anti-pinch system, and gives the hardware system based on ARM, including motor operation control, ripple signal detection, sensor detection and power off detection., specially designed ripple signal isolator, which solved the problem of ripple interference when four windows were running. The method of detecting the period of ripple signal is used to realize the detection of window position and window running force. The program flow of the four window anti-pinch system is given, and the key signal detection module, window static / down / up processing module are designed in detail to realize the window operation control with anti-pinch function. In order to adapt to different windows environment, a learning processing module is designed to obtain the key parameters of windows operation. In case of danger and exception, the window anti-pinch system designed in this paper can also be handled in time. In the instant when the system is powered off, the system can save the running state of the window, so that after the power supply is restored, the window operation control and anti-pinch functions can still be implemented.

The paper conducts actual tests on the window anti-pinch system: window operation and anti pinch function, window operation key parameters learning, window state saving function when power is off. The results show that the window anti pinch system meets the design requirements.