共查询到20条相似文献,搜索用时 93 毫秒
1.
2.
4.
5.
高速公路汽车防撞系统的安全行车距离研究 总被引:5,自引:0,他引:5
鉴于高速公路上汽车追尾碰撞事故比例日渐增多的状况,汽车防撞系统的研究越来越受到重视.分析得出此类交通事故的主要原因是由于驾驶员未能保持安全的车间距离.以影响行车安全距离主要因素的速度为主要参数,建立了一个简单可行的行车安全距离数学模型,并给出了相关参数的设定和具体的实现过程,实践表明该参数具有很好的实时性和准确性. 相似文献
6.
7.
研究汽车防撞系统优化特性,针对传统汽车防撞系统功能过于单一化的缺点,不能准确识别目标.为了拓展对目标的跟踪和识别功能,采用边搜索边跟踪雷达目标探测理论,提出一款多功能汽车防撞系统.阐述了系统的设计目标、功能分配和系统设计框图等内容,建立了探测目标的模型,并进行了目标预测曲线仿真分析.实现多功能防撞系统可获得与实际曲线较一致的预测曲线,并根据残余误差曲线实时调整防撞预处理门限.仿真结果表明,设计的多功能汽车防撞系统可以准确实现目标识别和防撞功能. 相似文献
8.
10.
汽车防撞系统又名空气包(airbag)是目前世界上最先进的汽车驾驶员的安全保护系统,其主要部件为感知汽车冲撞信息的传感器,本主要阐述空气包传感器的结构组成及其工作原理。 相似文献
11.
12.
13.
二轮倒立摆小车要求其在控制摆杆稳定的同时在水平面上自由行走,对控制的时效性上提出了严格的要求.在此基础上为了实现二轮小车倒立摆的超声波避障,采用以人工势场法为主,栅格法为辅的方案实施避障.首先,根据势场法快速反应的特点迅速给出避障决策.当势场法不能准确给出正确决策的时候,采用栅格法对其做辅助决策,弥补人工势场法的不足.仿真结果表明:基于以人工势场法为主,栅格法为辅的避障方法能有效的实现二轮倒立摆小车的避障功能. 相似文献
14.
Li Li Xinyu Peng Fei-Yue Wang Dongpu Cao Lingxi Li 《IEEE/CAA Journal of Automatica Sinica》2018,5(5):1012-1016
In this paper, we discuss how to develop an appropriate collision avoidance strategy for car-following. This strategy aims to keep a good balance between traffic safety and efficiency while also taking into consideration the unavoidable uncertainty of position/speed perception/measurement of vehicles and other drivers. Both theoretical analysis and numerical testing results are provided to show the effectiveness of the proposed strategy. 相似文献
15.
随着无人机作战环境日益复杂,无人机避开动态障碍物的研究成为热点问题.为提高导引避障性能,借助比例导引律的思想,通过使无人机与动态障碍物的相对速度方向导引到避障向量方向,完成避障.为满足避障完成时间和无人机机动性能约束要求,给出了避障时间估计和法向加速度表达式,通过解算得到了比例导引系数取值范围.避障完成后无人机在避障点可用比例导引律进行路径规划,最后到达目标点.仿真结果验证了算法的有效性. 相似文献
16.
为了提高水下机器人(AUV)在复杂海洋环境下的自适应性,文章对传统的避碰方法进行了改进.对AUV的禁入区和潜在碰撞区进行了安全性分析.建立了前视声纳模型以及三维水下规划空间模型.提出了基于强化学习、BP神经网络及人工势场相结合的避碰算法.在AUV与环境的试错交互中,借助于来自成功和失败经验的奖励和惩罚值,不断改进水下机器人的自治能力.设计了AUV深度行为模糊协调器, 对潜深行为和距底高度行为进行协调融合.开发了AUV运动规划与仿真的半实物软件系统,仿真试验证明了算法的合理性与可行性.研究对于提高AUV的自主性和安全性具有重要的应用价值. 相似文献
17.
Chaoyue Zu Chao Yang Jian Wang Wenbin Gao Dongpu Cao Fei-Yue Wang 《IEEE/CAA Journal of Automatica Sinica》2020,7(4):1045-1063
A global planning algorithm for intelligent vehicles is designed based on the A* algorithm, which provides intelligent vehicles with a global path towards their destinations. A distributed real-time multiple vehicle collision avoidance (MVCA) algorithm is proposed by extending the reciprocal ${ n}$-body collision avoidance method. MVCA enables the intelligent vehicles to choose their destinations and control inputs independently, without needing to negotiate with each other or with the coordinator. Compared to the centralized trajectory-planning algorithm, MVCA reduces computation costs and greatly improves the robustness of the system. Because the destination of each intelligent vehicle can be regarded as private, which can be protected by MVCA, at the same time MVCA can provide a real-time trajectory planning for intelligent vehicles. Therefore, MVCA can better improve the safety of intelligent vehicles. The simulation was conducted in MATLAB, including crossroads scene simulation and circular exchange position simulation. The results show that MVCA behaves safely and reliably. The effects of latency and packet loss on MVCA are also statistically investigated through theoretically formulating broadcasting process based on one-dimensional Markov chain. The results uncover that the tolerant delay should not exceed the half of deciding cycle of trajectory planning, and shortening the sending interval could alleviate the negative effects caused by the packet loss to an extent. The cases of short delay (${ < 100}$ ms) and low packet loss (${ < 5\%}$) can bring little influence to those trajectory planning algorithms that only depend on V2V to sense the context, but the unpredictable collision may occur if the delay and packet loss are further worsened. The MVCA was also tested by a real intelligent vehicle, the test results prove the operability of MVCA. 相似文献
18.
采用激光测距传感器和霍尔传感器,在MSP430控制下测试即时的车速和车辆前方障碍物的距离,单片机根据当时车速按预先的设计自行设置即时行车安全距离,并使之与采集回来的即时距离作比较。当前方车辆与本车辆的距离小于即时行车安全距离时,进行报警。并且单片机通过控制显示模块显示当前的速度、理论安全距离、实际距离。便于驾驶员更好了解信息。 相似文献
19.
提出了一种采用避免冲突开关的多路访问多星型高速局域网协议。协议分析比较结果表明,其性能优于许多现有的LAN协议,适合于综合业务高速局域网。 相似文献