车用轮速传感器的信号检测技术及其应用分析

车轮抱死制动系统即ABS,它是一种在汽车制动过程中通过汽车中的轮速传感器将车轮转速的变化转化为电信号并快速回馈给汽车电子控制器,再由电磁阀调节轮缸对车体进行控制,以便获得较好的侧向及纵向附着系数,最终保持车轮制动状态良好的方法。所以对轮速传感器的信号检测与特性分析就异常重要。本文针对这一环节根据Lab VIEW设计了一套轮速传感器的信号检测分析系统,还在系统中设置了控制平台和数据波形存储及回放功能,提高了对轮速传感器的检测效率。     

霍尔式轮速传感器功能测试系统设计

针对目前汽车轮速传感器测试系统效率低等问题,设计了一种基于LabVIEW的汽车轮速传感器的功能测试系统。该测试系统综合运用虚拟仪器技术、数据采集技术以及计算机自动化处理技术,对汽车轮速传感器的输出信号进行采集和处理。通过实际运行测试,证明所设计系统稳定性高、实时性强,测试精度达到0.1%,测试速度达到10.5 s/pcs。软件界面友好,能快速检测轮速传感器各项指标是否合格,有效提高了轮速传感器的检测效率和准确性,确保了产品的出厂合格率在100%的水平。     

车辆TPMS轮速传感器误差消除方法研究

轮胎压力监测系统能够实时地自动监测行驶中汽车的轮胎气压,对于提高行车安全具有重要的意义。基于轮胎压力监测系统硬件平台,阐述了轮速信号的获取,研究了异点剔除方法,提出了基于弹性BP神经网络分析轮速传感器误差的方法,实现了对轮速信号的修正。仿真和实验结果表明,该轮速传感器误差消除方法的精度可达2×10-4rad,能够显著降低传感器误差,提高轮速信号的获取精度。     

基于CAN总线的汽车轮速传感器设计

传感器网络化是传感器领域发展的一项新兴技术。它在统一网络协议的基础上实现传感器信号的数字化、网络化的变送。介绍了一种基于CAN总线的汽车轮速传感器的设计方法及有关芯片的功能,设计研究了轮速传感器信号处理电路并用单片微机进行信号的采集和处理。所设计的传感器测速系统测量实用性强、准确度高,具有广阔的应用前景。     

基于虚拟仪器的发射筒开关盖压力检测系统

为准确检测筒盖系统开关盖过程中油路压力,给筒盖系统的调试和安全使用提供依据和保障,研发了基于虚拟仪器技术的发射筒开关盖压力检测系统。该系统主要由压力传感器、数据采集卡和计算机等硬件组成,并应用LabVIEW开发了系统检测平台,实现了筒盖系统主油路的动态压力波形采集与检测。该系统具有较高的测量精度和良好的实用性。     

nRF24L01在ABS试验平台上的应用

介绍了无线通信模块NRF24L01的结构和特点,设计无线通信的ABS参数测量系统,系统通过对ABS试验平台轮速进行采集,将轮速转化成频率信号,利用周期测量法测出频率,经无线通信模块NRF24L0将数据发送出去。在终端通信模块与主接收模块之间采用TDMA通信方式进行数据交互,主接收模块接收到数据传送到上位机上显示。     

基于虚拟仪器的车载电子电气测试平台设计

车载电子电气测试平台硬件系统采用PXI模块化板卡与特制信号模拟板卡,软件系统采用LabVIEW模块化软件。集成开发了H&H电源、TOELLNER电源、程控可变电阻模拟板卡与程控CAN故障注入板卡的动态控制;依据测试需求开发了用户管理界面;模拟了曲轴凸轮轴传感器信号、轮速传感器信号及车速传感器信号;实现了车载电子电气系统测试的自动化与半自动化。     

JCZ型转矩转速传感器输出信号的处理方法

为了测量转矩和转速,将转矩、转速信号通过JCZ型转矩转速传感器转换成两路正弦信号的电信号的进行测量;介绍了相位差检测电路,对相位差检测电路中各结点的信号波形和检测电路输出波形进行了分析,提出了基于P89LPC932单片机的等精度测量的信号处理方法;该方法有效地消除转速对转矩检测的影响,提高了测量精度;此方法已应用于某变速箱加载测试系统中,并且取得预期效果;实际应用表明,该方法的测量结果准确、稳定、可靠。     

机动车轴重测量设备的自动检定与管理系统

在机动车轴重测量设备的检定中,为了提高检测的准确性和效率,采用计算机和虚拟仪器开发了机动车轴重自动检定系统.设计了可以模拟轴重标准信号的自动加压装置,完成了称重传感器数据的自动采集和数据管理等功能.结果表明该系统能准确高效地测量机动车轴重数据,实现了测量设备的自动检定.     

基于FPGA的水声信号采样存储系统设计

为了提高水声传感器网络通信系统试验和算法研究的效率,水声传感器网络节点需要具有水声通信的原始波形数据的记录功能.本文设计了一种水声信号采样存储系统,实现了数据变速率AD采集、数据环形存储、数据连续读取、数据飞读等功能.该系统具有结构清晰,集成度高,工作可靠等优点,可以有效提高水声传感器网络试验的效率.     

Only connect: teaching, technology and telesis

Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

Avoiding semantic and temporal gaps in developing software intensive systems

Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.     

Designing economic np control charts: A programmed simulation approach

This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.     

The development of robot art

Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。     

How do children do mathematics with LOGO?

Abstract  This paper considers some results of a study designed to investigate the kinds of mathematical activity undertaken by children (aged between 8 and 11) as they learned to program in LOGO. A model of learning modes is proposed, which attempts to describe the ways in which children used and acquired understanding of the programming/mathematical concepts involved. The remainder of the paper is concerned with discussing the validity and limitations of the model, and its implications for further research and curriculum development.