方向盘转角传感器性能标定及检测系统设计

针对某企业方向盘转角传感器性能标定和检测的需求,设计了一套方向盘转角传感器性能标定及检测系统,该系统能够实现对方向盘转角传感器的性能标定补偿和自动检测。基于PCI数据采集卡设计的高精度数据采集模块实现了对过程数据的实时采集;基于低惯性伺服电机、MPC08运动控制板卡设计的驱动加载系统实现了方向盘转角传感器静态标定时的驱动角度精准控制;采用高速CAN总线通信对方向盘转角传感器信号进行高速通信,实时读取方向盘转角传感器角度信息;使用LabVIEW编程软件,完成对方向盘转角传感器标定检测流程的实时控制、数据采集处理显示等功能。在方向盘转角传感器完成灵敏度标定后,经检测,其非线性误差、迟滞误差等均在允许范围之内。对方向盘转角传感器性能标定及检测系统进行大量重复性试验,得出输出角度的合成标准不确定度为0.145°,试验数据表明,该系统能够满足企业对于方向盘转角传感器性能标定和检测功能的测试要求。     

一种无角度传感器的SBW方向盘转角获取方法

文中针对方向盘转角传感器成本高的问题,提出了一种无角度传感器的线控转向系统方向盘转角获取方法。该方法利用线控转向系统路感电机的转子电气角度,采用多点采样的思路,对路感电机的转子电气角度进行实时过零检测,从而计算方向盘的转角。通过该方法获得的方向盘转角与专用转角传感器获得的方向盘转角的比较表明,误差保持在1°以内,满足线控转向系统的要求。     

转角传感器零位标定模块优化设计

汽车电动助力转向系统(EPS)大多依靠方向盘转角传感器来检测方向盘角度进行主动回正控制,而转角传感器在正常工作前需要通过诊断仪或下线诊断系统等较为复杂的设备进行零位标定。详细介绍一种转角传感器零位标定模块的优化设计方法,并给出该模块在实际工作中的应用成果。由于这种零位标定模块具有使用简单、高效的特点,对提高汽车转角零位标定效率有很大帮助。     

线控转向系统方向盘转角传感器设计

为确保线控转向系统方向盘输入转角能精确采集,以双芯片MLX90316霍尔传感器为角度采集部件,STM32作为控制器,设计一种线控转向车辆方向盘转角数据采集系统。文中对硬件设计和软件设计介绍的同时进行了详细的分析。测试结果表明,多组数据与取值的方差较小,稳定性较高,满足数据采集需求。     

汽车ESP和EPS系统的转角转矩组合式传感器

对一种可用于汽车ESP和EPS系统的转角与转矩组合式非接触传感器进行了研究.介绍了该传感器的结构和原理,推导了传感器的输出方程和灵敏度表达式.通过试验分析了传感器激磁磁场强度对转矩测量精度的影响,并得出了最佳激磁磁场强度.在0 ～450 N·m范围对传感器进行扭矩加载,得到了较高的测量灵敏度、线性度、重复度以及较低的迟滞静态误差;在500～3500 r/min范围内,转速最大相对误差为0.80％.试验数据显示:该传感器的精度能够达到1.0％,用于测量汽车方向盘的转矩和转角是可行的.     

防水防尘式汽车方向盘转角传感器的设计

汽车方向盘转角传感器,作为汽车动力稳定性控制系统的重要部分,关系着车辆行驶安全性和车辆的舒适感,当前多数转角传感器安装在转向柱,一般没有专门设置防水防尘保护措施,很容易导致液体或者细小颗粒进入传感器导致故障率升高,准确度降低,本设计通过系统的结构件改良,最终达到防水防尘效果。     

智能倒车系统中方向盘转角精确控制的实现研究

随着现实生活中因倒车而产生的困难和纠纷的不断增加,智能倒车系统的研究势在必行,而要实现汽车的高精度倒车,对方向盘转角的精确控制乃是关键技术之一.为此,本文提出了基于位置、速度、电流的三闭环控制方案,实验结果表明,该套方案能够实现方向盘转角控制无超调、响应快速且稳态误差小,可满足智能倒车系统的要求.     

线控液压转向系统动态特性研究分析

该文根据线控液压转向系统工作原理建立液压系统仿真模型,采用电液比例PID控制方法,将车轮转角目标值与方向盘输入实际值的偏差作为输入进行控制.首先利用阿克曼定理进行理论分析,得出车轮最大转角和主动轮与从动轮转动角度关系,然后通过改变方向盘输入信号的频率、车速、伺服阀频率和额定流量、比例增益,对线控转向系统动态特性进行研究...     

一种基于霍尔效应的方向盘转角传感器设计

以设计一款新型的方向盘转角传感器为目的，首先研究其背景，再分析传感器的运行原理，然后使用CATIA软件绘画出转角传感器各机构的零件图以及总装配图，并用3D打印机打印出模型，接着对模型进行组装，最后对传感器模型进行线路测试得出转角角度与输出电压的关系线图，根据实验数据对传感器的性能进行评估。     

基于小波技术的疲劳驾驶行为识别研究

文中以实际道路环境应用为背景,通过一种能正确模拟汽车驾驶动作,获得实车驾驶感觉的驾驶模拟器,利用传感器数据采集系统采集方向盘转角数据,研究了一种基于小波分析方法的驾驶人疲劳检测方法,综合运用了数据处理、采样,去噪、模式识别等多种技术,以降低因驾驶人疲劳驾驶导致的交通事故.     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.