添加倒车功能并增加最高速度限制到50km/h#1
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### 功能改进 - 增加最高速度限制 ：从30km/h提升到50km/h，提高车辆行驶速度 - 添加倒车功能 ：实现按x键在速度接近停止时切换倒车模式 - 安全机制 ：只有在速度<1km/h时才允许切换倒车模式 - 视觉反馈 ：倒车模式下显示红色"REVERSE MODE"提示 ### 技术实现 - 修改 SimpleController 类，增加 manual_reverse 标志和 toggle_reverse() 方法 - 调整控制指令返回值，增加reverse参数 - 在主循环中添加x键处理逻辑 - 在显示界面添加倒车状态指示 - 保留原代码作为注释，便于回溯 ### 操作说明 1. 按s键减速到接近停止（速度<1km/h） 2. 按x键切换到倒车模式 3. 车辆会自动向后行驶 4. 再次按x键退出倒车模式，恢复前进 这些修改提升了系统的功能性和用户体验，同时保持了代码的可读性和可维护性。
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修改概述
修改的详细描述
最高速度限制提升
倒车功能实现
SimpleController类中添加manual_reverse标志toggle_reverse()方法用于切换倒车/前进模式reverse参数安全机制
用户界面优化
经过了什么样的测试？
运行效果
2026-04-15.213107.mp4
2026-04-15.213209.mp4