汽车前照灯检测技术探讨

汽车前照灯是在夜间行驶的主要照明装置,远近光形的好坏和照射方向对汽车夜间安全行驶起着重要的作用。因此,为保障机动车运行安全,应对前照灯的有关性能进行严格检验。本文就汽车前照灯远近光检测技术进行了分析。     

专利发布

<正>专利名称:阶梯水平明暗线光型汽车近光前照灯专利号:201210143979.9专利权人:毛振权项目简介:一种阶梯水平明暗线光型汽车近光前照灯,它是由单灯丝灯泡安装在特殊的反射镜上来实现的,且不用屏片遮挡。这个特殊反射镜的左主体面(面③和面④)(焦点在O1,焦距为F基)与右主体面(面③′和面④′)     

应用影像对正法的前照灯检测技术

前照灯是汽车安全检测的重要内容之一，其检测技术在国内已经发展了十几年，但随着汽车工业的快速发展，既有的一些前照灯检测技术已显落后，不能满足新的需求。本文针对我国机动车前照灯的配光模式以及结构形式的变化，分析了传统前照灯检测方法存在的不足，提出了一种应用影像对正法的前照灯检测新技术并阐述了其定标方法。     

JJG745-1991《汽车前照灯检测仪检定规程》中光束照射方位偏移角量值传递的分析

一、问题的提出根据ＧＢ７４５４《机动车前照灯使用和光束调整技术规定》２．２．４条 :经过调整的前照灯光束在平坦的道路上 ,其远光光束一般能照清前方约１００ｍ远的障碍物。为此ＧＢ７２５８《机动车安全运行技术条件》７．４．２条对汽车四灯制前照灯远光单光束提出 ,在光束调整后 ,在１０ｍ远的屏幕上 ,光束中心点的离地高度为灯的基准中心高（Ｈ）０．８５Ｈ～０．９０Ｈ的要求。而实际对汽车前照灯的检测 ,目前均由仪器法代替屏幕法 ,对仪器的检定采用ＪＪＧ７４５-１９９１《汽车前照灯检测仪检定规程》。这就涉及经过检定的检测…     

一种标定前照灯校准器新方法探讨

随着我国汽车工业的迅速发展,汽车社会保有量的迅猛增长,对汽车性能等计量检测内容亦日益增多.这其中汽车的前照灯防眩目直接关系到行车安全,作为汽车前照灯测试仪是调整前照灯的关键设备,前照灯校准器是检定前照灯仪的极其重要的量值传递的计量仪器,其本身计量性能的准确性就显得更为重要.在此,笔者对前照灯校准器标定与同行进行研讨.     

对汽车前照灯检测仪检定的探讨

汽车前照灯检测仪用于汽车及摩托车、轮式拖拉机前照灯的光束照射方位和发光强度的检测.目前对各型前照灯检测仪依据JJG745-1991<汽车前照灯检测仪检定规程>进行检定.根据多年来的实践,我感到在执行规程对自动跟踪式前照灯检测仪检定中尚存在值得商讨的问题.     

使用激光标准器检定前照灯检测仪近光部分的几点思考

机动车近光灯是当车辆前方有其他道路使用者时,不致使对方眩目或有不舒适感所使用的近距离照明光束。公安部标准GA468—2004《机动车安全检验项目和方法》表1规定,前照灯近光光线的明暗截止线转角折点位置的检测应采用前照灯检测仪;GB7258—2004《机动车运行安全技术条件》附录D3规定,机动车安全技术检验时宜采用前照灯检测仪检验前照灯光束照射位置。     

面阵CCD在机动车前照灯测量中的应用

介绍以面阵ＣＣＤ为探测器的有前照灯强测量系统。系统的测量全过程由计算机控制。具体给出系统测试的原理,总体结构、软件和硬件配置,并详细介绍了ＣＣＤ器件在具体应用时进行修正所用的方法和实验结果。     

JQD-1型汽车前照灯全自动检测仪

JQD—1型汽车前照灯全自动检测仪是以GB7258—87标准为依据研制的。检测仪能自动对准汽车前照灯的光轴,自动测定光轴垂直和水平偏移量以及灯的发光强程。仪器上的三块数显表直接显示读数,具有操作简便、测量准确、自动化程度高的特点,是汽车安全检测的必备设备之一。尤其适用于机动车、安全技术检测线,汽车制造厂和维修厂对汽车前照灯的有关参数进行检测。     

基于线阵CCD扫描法的拉丝模孔径测量仪

采用平行光投影法，以高精度线阵ＣＣＤ为测量传感器，结合机械扫描方法，完成对拉丝模孔径的快速检测。提出了ＣＣＤ孔径检测中抗暗斑干扰的电路设计。     

Insertion of triangulated surfaces into a meccano tetrahedral discretization by means of mesh refinement and optimization procedures

In this paper, we present a new method for inserting several triangulated surfaces into an existing tetrahedral mesh generated by the meccano method. The result is a conformal mesh where each inserted surface is approximated by a set of faces of the final tetrahedral mesh. First, the tetrahedral mesh is refined around the inserted surfaces to capture their geometric features. Second, each immersed surface is approximated by a set of faces from the tetrahedral mesh. Third, following a novel approach, the nodes of the approximated surfaces are mapped to the corresponding immersed surface. Fourth, we untangle and smooth the mesh by optimizing a regularized shape distortion measure for tetrahedral elements in which we move all the nodes of the mesh, restricting the movement of the edge and surface nodes along the corresponding entity they belong to. The refining process allows approximating the immersed surface for any initial meccano tetrahedral mesh. Moreover, the proposed projection method avoids computational expensive geometric projections. Finally, the applied simultaneous untangling and smoothing process delivers a high‐quality mesh and ensures that the immersed surfaces are interpolated. Several examples are presented to assess the properties of the proposed method.     

The Research of Anti-Wear Properties of Organomolybdenum Compounds in the Engine Oils

A four-ball tester was used to evaluate the anti-wear performance of three kinds of organomolybdemun compounds in the engine oils, i. e., molybdenum dialkyldithiophosphate (MoDDP), molybdenum dialkyldithiocarbamate ( MoDTC), and sulphur and phosphorus freeorganomolybdeum (Molybdate). The results indicate that a low concentration of MoDDP doesn' t improve the anti-wear properties of the commercial engine oils, but a high concentration of MoDDP can obviously improve the anti-wear properties and the load-carrying capacity of the engine oils. MoDTC doesn' t improve the antiwear properties of the engine oils, but worsens the anti-wear properties of the oils. Signifi can timprove ment of frictional and wear characteristics is obtained with Molybdate added in the commercial engine oils and the formulated oils.     

Certification Institutions Expected to Update and Transfer Information on Present Standards

Standards are the basis for production enterprises to organize production, ex-factory inspection, trade (delivery) and technical exchanges, product certification, quality arbitration and supervision.……     

Flow calorimeter for enthalpy increment measurements on condensed gases

A flow calorimeter for enthalpy increment measurements on condensed gases is presented. A better knowledge of the properties of the liquefied natural gas is needed, and therefore a liquid loop has been designed for our flow calorimeter. The fluid loop in the calorimeter is designed in order to avoid the two-phase region, since two phases would give compositional disturbances in the measurements. The avoidance of the two-phase region is made possible by increasing the pressure of the test fluid after the measurement section, then heating the fluid at super-critical pressure past the critical point. Finally, the fluid is throttled to the low-pressure gas state at the inlet condition of the compressor that circulates the fluid. To perform the pressure increase, a new cryogenic pump has been designed. To evaluate the new equipment, measurements were taken on liquid ethane over the temperature range 146–256 K at pressure between 0.9 and 5.1 MPa.     

Certification Becomes Important for the I Quality; and Safety Supervision of the Chinese Liquor Sector

The end of 2007, over 200 unit products of more than 80 Chinese firms have passed the quality grade certification for liquor products. These products involve distilled spirits, beer, wine, yellow wine, fruit syrup wine and others, and cover over 80% of the national top-branded liquor products.……     

Deposition and Coating Properties on CVD Tungsten

Surface characterization and microstructure studies are performed on chemical vapor deposited (CVD) tungsten coating. There is about 2 μm thickness diffusion layer of tungsten in the molybdenum substrate. The thermal shock test shows tungsten coating has good adhesion with molybdenum substrate, but the elements of oxygen and carbon in the tungsten coating have the bad affection to the adhesion. The result of high-temperature diffusion experiment is the diffusion rate from molybdenum substrate to tungsten coating is faster.     

Refrigerators Enter a New Era of Health Preservation Frestech initiates the establishment of China's first standard for household sterilization refrigerators

On November 30, 2007, the China Association for Standardization (CAS) held a press conference at Beijing Diaoyutai State Guest House. Leaders from the China Household Electric Appliance Research Institute, the China Household Electric Appliance Association, and the China Consumers' Association attended and made speeches.……     

Analysis of marine hydrobiont lipid extracts as possible cryoprotective agents

We studied a combined effect of the cryoprotectants both of lipid and carbohydrate origin at the presence of DMSO or without it on cell viability and the RNA synthesis in the embryonic mollusc and echinoderm cell cultures obtained at different developmental stages. Cryoprotective properties of exogenous lipids correlated with their thermotropic behavior. Lipid extracts from marine hydrobiontes, which thermal transitions are characterized by relatively small part of calorimetric thermogram area lying at temperatures above 0 °C (6–18%), were found to possess a considerable cryoprotective activity. The results are discussed in relation to the prediction of the cryoprotective activity of lipid extracts for marine animal cells. In addition, it was found that marine invertebrate cells can be cryopreserved without DMSO at the presence of trehalose and lipid extracts of some marine hydrobiontes.     

Low-Temperature Properties of Silver

Pure silver is used extensively in the preparation of high-temperature superconductor wires, tapes, films, and other configurations in which the silver not only shields the superconducting material from the surrounding materials, but also provides a degree of flexibility and strain relief, as well as stabilization and low-resistance electrical contact. Silver is relatively expensive, but at this stage of superconductor development, its unique combination of properties seems to offer the only reasonable means of achieving usable lengths of conductor. In this role, the low-temperature physical (electrical, thermal, magnetic, optical) and mechanical properties of the silver all become important. Here we present a collection of properties data extracted from the cryogenic literature and, to the extent possible, selected for reliability.