共查询到20条相似文献,搜索用时 93 毫秒
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针对当前代客泊车研究中对泊车规划起始点的位姿要求较高的问题,提出一种基于分层有限状态机的代客泊车系统决策方法,设计车辆上层功能状态机与下层行为状态机,根据车辆所处环境与定义规则,建立车辆各行为状态之间的逻辑切换关系,完成车辆代客泊车与定点召回功能。为确保车辆在进入泊车状态前处于不确定状态与位姿的情况下,针对垂直车位完成车辆泊入路径的规划,采用多段路径规划,同时对行车与泊车切换区域进行计算,保证车辆在不同位姿情况下,均可以规划出泊车路径。最终通过实车试验,验证了该代客泊车系统方案的可行性与可靠性。 相似文献
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自主代客泊车系统是集智能驾驶环境感知、决策规划、运动控制技术于一体的综合系统,轨迹规划直接关系到代客泊车停车过程的效率、能耗、安全性和舒适性。为梳理自主泊车轨迹规划技术的发展现状,回顾了泊车技术的发展历程,针对泊车过程中单车轨迹规划问题开展调研,分析了面向自主代客泊车轨迹规划研究的进展。鉴于从单车智能到多车协同的转变展现了更大的系统优化潜力,继而梳理了多车协同轨迹规划的基本方法和研究现状,探讨了泊车场景下的协同规划研究进展及特点。对自主代客泊车轨迹规划的现存问题与未来发展趋势进行了分析和展望。 相似文献
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自动泊车系统能够帮助驾驶员更好地进行泊车操作,减少泊车时的心理压力。为了提高自动泊车系统的准确度,提升自动泊车系统在不同车位场景下的成功率,对自动泊车系统的性能进行综合评价与分析。文章提出了一种基于虚拟轮廓车位的性能测试方法,完成自动泊车性能各项评价指标的智能化测试。基于提出的测试方法选取装备自动泊车系统的某款车辆进行了典型车位场景下的实车测试,验证了测试方法的精确性、高效性以及便捷性,为自动泊车系统的开发验证提供了技术支撑。 相似文献
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徐家汇地区是上海市中心城4个市级副中心之一,是上海重要的CBD商务区。自2004年初第一批停车诱导显示屏投入使用以来,该区域停车诱导系统已包含停车场(库)21个,诱导泊位近5000个。从使用情况来看,该系统在诱导显示屏的设置、设计和诱导信息的提供上,没有充分考虑使用者的行为、心理特性,群众满意度不高。为配合该系统的改造升级,2006年4月进行了大规模的停车行为及意向调查,分析了目前停车诱导系统存在的问题,提出了改进措施,取得的成果对其他地区停车诱导系统的实施具有重要借鉴作用。 相似文献
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驻车制动力的检验方法分析 总被引:1,自引:0,他引:1
根据全国农用运输车统检的统计资料,以及车辆在上,下坡路面上驻车状态的受力分析,认为反力式制动试验台只具有单晌拖动能力,当以瓜力式制动试验台进行出厂检验和安全性能检测时,造成相反方向,驻车制动性能的全面漏检。 相似文献
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SL6400A轻型客车驻车制动器采用后桥车轮鼓式制动器,该车原驻车制动机构存在传动环节多、支座刚性差及拉索走向不合理等因素,致使左、右后轮制动力不平衡或不足,通过分析与对比,自行设计了一种新型驻车制动传动机构,该结构可通过平衡器的转动保证左、右后轮制动力不平衡或不足,通过分析与对比,自行设计了一种新型驻车制动传动机构,该结构可通过平衡器的转动保证左、右后拉索拉力相等。试验证明,驻车制动效果良好。 相似文献
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A Real-Time Parking Prediction System for Smart Cities 总被引:1,自引:0,他引:1
Eleni I. Vlahogianni Konstantinos Kepaptsoglou Vassileios Tsetsos Matthew G. Karlaftis 《智能交通系统杂志
》2016,20(2):192-204
》2016,20(2):192-204
A methodological framework for multiple steps ahead parking availability prediction is presented. Two different types of predictions are provided: the probability of a free space to continue being free in subsequent time intervals, and the short-term parking occupancy prediction in selected regions of an urban road network. The available data come from a wide network of on-street parking sensors in the “smart” city of Santander, Spain. The sensor network is segmented in four different regions, and then survival and neural network models are developed for each region separately. Findings show that the Weibull parametric models best describe the probability of a parking space to continue to be free in the forthcoming time intervals. Moreover, simple genetically optimized multilayer perceptrons accurately predict region parking occupancy rates up to 30 minutes in the future by exploiting 1-minute data. Finally, the real time, Web-based, implementation of the proposed parking prediction availability system is presented. 相似文献
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Because of the rapid increase of vehicle numbers and land values, there is an increasing shortage in the supply of parking facilities in many cities. In many parking lots, residential drivers bought private parking spaces with high prices to ensure that they have spaces to park at any time. Recently, some parking lot operation companies plan to temporally repurchase a few private parking spaces back during certain time periods in a day and sell these places to public users to fully utilize the limited parking resources. How to choose the repurchase amounts and stopping time so as to maximize the profit then becomes an important problem. To solve this problem, a Gaussian mixture model is first proposed in this article to describe the time-varying arriving/departing behaviors of drivers and meanwhile the stochastic constraints of the profit maximization problem. Then, the expected optimal repurchase amounts and stopping time are estimated via simulation optimization. This new approach not only provides a useful statistical tool for parking spaces modeling but also overcomes several key limitations of current queuing based methodologies. Particularly, it emphasizes how to model drivers' behaviors on a small time-scale and explains the resulting benefits. 相似文献