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阐述汽车前照灯在会车时进行远光/近光自动变换的设计思路,以及会车时自动变光距离可调的控制电路设计,控制系统还包括能根据环境亮度自动开启近光或远光灯的前照灯自动开灯/延时关灯的电路设计.该项技术具有支持手动/自动变光2种模式、设计简单可靠、性能稳定、施工方便和成本较低等特点,适合于汽车照明灯光系统的改造. 相似文献
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对我国主要的汽车用前照灯的标准进行了对比分析,总结了汽车用LED前照灯的标准的主要特点和发展现状,并逐条举例说明了《汽车用LED前照灯》与其他光源前照灯标准性能中主要技术指标的主要差异。 相似文献
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路面照明状况直接影响到汽车夜间行驶安全,自适应前照灯能根据汽车周围环境自动地调整照明模式,提高驾驶安全性。针对现有自适应前照灯照明模式不够灵活、光能利用率低等问题,提出了一种基于数字微镜元件的自适应前照灯光学方案,该方案以数字微镜元件为核心,并创新性地提出了利用第二导光管收集未利用的光能,采用光学软件 Tracepro 进行整个系统的仿真。实验结果表明:该方案能够实现自适应前照灯的多种照明模式,且通过使用第二导光管提高了光能利用率。由于可实现的照明模式多且照明灵活,能量利用率高,所以该系统具有广泛的市场前景。 相似文献
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随着半导体材料及封装工艺的进步,大功率白色LED在汽车前照灯上的应用将成为车用LED市场增长的重中之重。本文论述了LED作为汽车前照灯使用的关键的技术难点,介绍了LED汽车前照灯的应用状况。 相似文献
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本文介绍了一种由STC12C2052AD型单片机控制,光敏传感器采集信号,继电器执行动作的夜间汽车前大灯远近灯光转换的自动控制系统。该系统安装在汽车上,使汽车在夜间行驶时,根据对头车驶近驶离的情况,能够自动调节前大灯远近灯光转换。该系统稳定可靠,成本低廉。有一定的推广和使用价值。 相似文献
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飞秒激光三维光存储是实现高密度光存储的重要方法。为了提高飞秒激光三维光存储技术的实用化,基于DVD聚焦、循道伺服技术搭建了一套飞秒激光三维光盘存储系统。针对DVD光学头建立音圈电机电气模型,并通过典型二阶系统参数计算可获得详细的光头传递函数。针对DVD光学头传递函数,采用模糊PID算法,构建模糊PID控制系统的仿真模型,通过模糊控制规则在线对PID参数进行整定,并进行计算机Matlab仿真。仿真结果表明:模糊PID控制算法可使系统的稳定性、响应速度、超调量和稳态误差等达到系统性能指标的要求。 相似文献
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传统PID控制器因结构简单、易于实现而在控制系统中得到了广泛运用,但往往因实际系统中的非线性因素影响而不得不采用变结构、变参数等手段来提高实际控制效果,而模糊控制对非线性因素的影响却能明显改善系统控制品质.文中主要研究了模糊自整定PID控制方法在雷达伺服系统中的应用,并在实际系统中进行了实验验证.仿真结果表明该方法能明显提高系统控制品质,具有一定的工程推广价值. 相似文献
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A novel pitch control system for a wind turbine driven by a variable-speed pump-controlled hydraulic servo system 总被引:1,自引:0,他引:1
Mao-Hsiung Chiang 《Mechatronics》2011,21(4):753-761
The paper aims to develop a novel pitch control system for a large wind turbine driven by a variable-speed pump-controlled hydraulic servo system. To perform practical pitch control experiments, a full-scale test rig of the hydraulic pitch control system for a 2 MW wind turbine’s blade, including a novel pitch control mechanism, a variable-speed pump-controlled hydraulic servo system, a disturbance system and a PC-based control system, is designed and set up. The variable-speed pump-controlled hydraulic servo system, containing an AC servo motor, a constant displacement hydraulic piston pump two differential hydraulic cylinders and hydraulic circuits, achieved high response and high energy efficiency, so it is suitable for wind turbine applications. Besides, to implement the pitch control in the proposed novel pitch control system, an adaptive fuzzy controller with self-tuning fuzzy sliding-mode compensation (AFC-STFSMC) is developed to design the pitch controller. Finally, the developed variable-speed pump-controlled hydraulic servo system was built and verified for the path tracking control and path-positioning control of the pitch control of the wind turbines by practical experiments in a full-scale test rig under different path profiles, load torques, and random wind speeds. 相似文献
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为代替传统繁杂的汽车线束,汽车CAN总线应运而生。以CAN总线为基础,结合51系列单片机技术,研究开发了汽车前照灯的CAN总线多路传输系统。按照整体结构进行了CAN总线传输节点的软件设计,设计出并口CAN适配卡,通过编写动态链接库(DLL),向上层应用软件提供读/写函数接口,实现了上位机与下位机的通信。该设计使得传统线束大大简化,可靠性得到了极大提高,有效节约了线束安装空间。 相似文献
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Kuang-Yao Cheng Ying-Yu Tzou 《Power Electronics, IEEE Transactions on》2004,19(4):1085-1099
This paper presents a novel design approach by applying gradient optimization with fuzzy step-sizing techniques to the design of a digital permanent magnet synchronous motor (PMSM) servo drive. The servo specifications and design variables are specified and analyzed to formulate a controller optimization problem. The servo responses are then fed back to evaluate the overall system performances, which can be expressed as objective functions with respect to the servo control parameters. According to the objective functions and design specifications, the servo control parameters can be properly tuned toward their optimal values by using the proposed optimization techniques. In order to improve the convergent rate of the optimization process, a fuzzy-logic based step-size tuning strategy is presented. Because of the nonlinear property of the digital servo drives, the tuned servo control parameters may be only optimal for a particular operating point, therefore, once the optimum design is achieved, the proposed fuzzy optimizing controller can perform as an intelligent tuner for on-line gain adaptation under different loading conditions. The proposed fuzzy optimization servo tuner has been realized under a PC-MATLAB-based environment with an on-line controlled digital PMSM servo drive. Simulation and experimental results indicate that the control parameters of a digital PMSM servo drive can be optimized for its dynamic responses under various load conditions. 相似文献