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汽车主动防擅控制系统的研究主要集中在主动防撞预警和驾驶控制模型方面,对防撞控制系统的整体分析建模涉及较少.因此在分析国内外汽车防撞系统研究的基础上,建立了汽车防撞控制系统整体模型.模型包括雷达传感器、车辆模糊控制器和车辆接口并探讨了车辆跟驰最小安全距离控制算法.在遵循驾驶员优先的原则下.根据建立的防撞控制模型,利用面向对象方法对汽车防撞控制系统进行了深入的分析和设计,借助UML建模语言,从需求入手,逐步深入,对模糊控制器的模糊事实类、模糊规则类、模糊结果类进行详细的分析设计,建立了系统的静态视图和动态视图.实践证明该系统模型为汽车主动防撞控制系统研究提供了合理、适用的仿真及结果. 相似文献
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在分析国内外汽车主动防撞控制系统研究的基础上,建立了汽车防撞控制系统模型,该模型包括雷达传感器、车辆模糊控制器和车辆接口并探讨了车辆跟驰最小安全距离控制算法。在遵循驾驶员优先的原则下,根据建立的防撞控制模型,利用面向对象方法对汽车防撞控制系统进行了深入的分析和设计,借助UML建模语言,从需求入手,逐步深入,对模糊控制器的模糊事实类、模糊规则类、模糊结果类进行详细的分析设计,建立了系统的静态视图和动态视图。 相似文献
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基于智能交通的快速发展,研究了在高速路段下基于机器视觉的车道偏离检测与车辆前向安全车距检测技术.首先固定车载相机,通过相机标定获取相机的内参数和外参数,进而设计车距检测模型.该模型不但能够检测出前方车辆与无人车的距离,还能计算出前方车辆相对于摄像机光轴的偏转角度.接着在CCP偏离检测算法的基础上,设定安全和报警区来建立车道偏离模型,并对当前车辆的偏离结果作出正常行驶的评判.最后借助TI的DVSDK组件包将算法移植到嵌入式平台DSP-DM3730上测试.实验表明,本文设计的车距检测模型和车道偏离模型在解决无人车的前向防撞检测和车道偏离检测等问题上具有较好的参考价值. 相似文献
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Bryce Johnstone 《单片机与嵌入式系统应用》2021,21(12)
安全问题就在眼前
当我们考虑汽车安全时,大多数人会立即想到硬件设备:安全气囊、防抱死刹车和防撞缓冲区在事故中都会使用到,可以确保车上人员的安全.但安全不仅仅是要在碰撞中幸存下来,还需要将系统安装到位以避免碰撞和故障.
欧盟新车安全评鉴协会(Euro NCAP)将最高的五星安全等级定义为:"碰撞保护整体表现优秀,配备了全面而强大的防碰撞技术".在避免碰撞方面,我们不仅可以利用最新的先进驾驶辅助系统(ADAS)功能来实现自动刹车及引导车辆在其车道上行驶,还可以寻求一种更简单的解决方案——避免硬件故障. 相似文献
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汽车倒车防撞系统在车辆倒车时利用模糊逻辑控制方式,通过安装在车身上的5个超声波探头测量汽车两侧及车尾与障碍物的距离,当车上装的探头与障碍物的距离大于设定的极限值发出声音报警,提醒驾驶员而实现安全倒车。本文介绍了超声波测距工作原理;并对汽车倒车系统进行仿真实验,通过仿真、实验验证了本系统的可行性和有效性。 相似文献
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汽车行驶稳定动力学优化控制,旨在通过确定汽车行驶状态下纵向车速、横摆角速度、质心侧偏角等重要的状态变量,提前预知汽车未来时刻的可能的行驶状态,并将其输送到汽车底盘主动控制系统,实现动力学优化控制,提高汽车的主动安全性,减少道路交通事故.寻找一种低成本、高精度且能够实时获得车辆重要状态参数的方法,是汽车稳定行驶动力学优化控制的关键技术之一.利用Madab/Simulink仿真工具,分别建立了汽车动力学仿真模型和车辆行驶状态Kalman滤波估计仿真模型,可以同时实现对车辆行驶状态的仿真和对车辆行驶过程中横摆角速度、侧向加速度和质心侧偏角的估计,并且模型具有可扩展性.最后进行了实车场地试验,完成了阶跃曲线、双移线等操作,通过模型仿真、试验数据和状态估计结果的比较得出,三者一致性较好,同时验证了车辆动力学仿真模型和状态估计算法仿真模型的有效性和通用性. 相似文献
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以一个基本的汽车电子点火系统为基础,在研究其工作原理的基础上,对各模块进行行为特征提取,用IEEE标准的数/模混合信号硬件描述语言VHDL-AMS为其建立了行为级模型,仿真结果表明,该系统模型经充实后可以作为研究汽车电子点火系统的仿真模型。 相似文献
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B Birch 《Microprocessors and Microsystems》1982,6(7):371-377
The automotive industry has not been excepted from the rapid development of microcomputer applications. Since the advent of the trip computer some four or five years ago, the functional possibilities for automotive instruments have mushroomed. To clocks and trip computers have been added printers, security systems, cruise controls, environmental controls, vehicle condition monitoring and multiple displays for dashboards. The dashboard itself will host more functions than could once be imagined without filling the dash with gauges, and many that were once inconceivable such as speech synthesis. As well as increasing the information content of automotive instruments, it is believed at Smiths Industries these advances will provide new sales features which could prove to be invaluable in the marketplace. 相似文献
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The ignition control requirements of an internal combustion petrol engine are reviewed and the benefits of accurate ignition control are discussed. A design for a microprocessor-based open-loop ignition controller is described and the experimental results obtained with this controller presented. Various means of achieving further improvements are suggested, including a closed-loop controller for optimum ignition timing under all conditions of engine wear. This strategy uses peak cylinder pressure angle as the feedback signal on which the adaptive control is based. 相似文献
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飞思卡尔开发的基于微机电系统(MEMS)的三轴向低重力加速计MMA7260Q是一款单芯片设备,能在XYZ三个轴向上以极高的灵敏度读取低重力水平的坠落、倾斜、移动、放置、震动和摇摆变化,体型小巧功耗低,且有可选量程,可广泛的应用于各个领域。本文简要的介绍了MMA7260Q的工作原理,且就其在车载导航定位方面的应用进行了设计。 相似文献
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An 8-bit single-chip microcomputer μPD7811 for automotive engine control has been developed. This microcomputer has been improved both in its peripheral functions and its instruction set over existing single-chip microcomputers. It allows the conversion of the engine control system, which is composed of a number of LSI chips, to a single-chip configuration. It is now therefore possible to develop a compact reliable low cost engine control system. In this paper, the design target, the reinforced peripheral functions and the instruction set of the microcomputer are presented. 相似文献
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In a drive-by-wire steering system for the disabled driver, the safety of the system depends on the reliability of the electronic components. There is however another constraint, that of cost. A microprocessor-based system appears to be the most appropriate type. It was found however that three independent channels were needed to get the required level of reliability. The prototype system described here illustrates some of the problems and some of the potential solutions. Important among these is the balancing of the computations between the parallel channels. 相似文献
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R Müller 《Microprocessors and Microsystems》1982,6(7):367-369
A single-chip microcomputer for automotive applications is described, with specially reference to its application to trip computers. The chip is based on a standard chip (the SAB 8021) and includes peripheral circuitry comprising an A/D converter, 4-, 8- and 16-bit counters, keyboard decoder, display driver and low-power time-of-day clock. The standard chip's RAM and ROM capacities are doubled. The article described various working applications in which the single-chip microcomputer has been used, namely in two types of trip computers. The emulation system is also outlined. 相似文献
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分析和比较了不同软件建模方法的适用条件和使用利弊,并针对现有建模软件的缺点及汽车电子控制系统所具有的目的性、相关性、层次性、随机性等特点,采用面向对象的软件建模方法建立汽车电子控制系统模型,完整和直接的映射了汽车电子控制系统的问题域,较好的模拟了现实世界的属性和操作。最后以汽车ABS(Anti-lock Braking System,防抱制动系统)为例说明了此方法在建模效果上的有效性和合理性。 相似文献
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