汽车电动助力转向器性能试验台测控系统设计

引言 电动助力转向系统（Electric Power Steering,缩写EPS）是一种直接依靠电机提供辅助扭矩的新型动力转向系统.EPS汽车转向系统作为汽车的一个非常重要组成部分综合性能关系着整个汽车的性能质量,同时又是维持汽车平稳、安全、可靠行驶能力的基本保障.因此,研制精确度高、实时性好的EPS试验台对保障EPS的性能有重要意义.本文设计了汽车电动助力转向器性能试验台测控系统,通过模拟汽车转向时汽车电动助力转向器的工作状态,并在此状态下测试汽车电动助力转向器的各项性能指标.     

转阀式动力转向器的结构原理及使用维护

转阀式动力转向器将动力缸、分配阀和转向器设计成结构紧凑、灵敏度高、工作可靠的一个整体，从而提高了汽车转向系的技术性能。详细地介绍了转阀式动力转向器的具体结构、工作原理和具体维护方法。     

汽车转向器变速比特性对操纵轻便性的影响

为了协调汽车转向轻便性、直线行驶稳定性和机动能力对转向器速比特性的不同要求，转向器变速比特性引起了人们的广泛注意。本文通过对东风轻型货车在装有不同速比转向器的多种工况条件下试验结果的对比分析，在对整车操纵稳定性的影响方面得出了一些有益的结论。     

汽车动力转向器优化匹配设计

分析常规汽车动力转向器应用存在的问题,阐述带卸荷阀动力转向器应用的特性及优点。     

循环球式动力转向器输出端漏油原因分析

汽车转向系中动力转向器是一个非常关键的部件。汽车转向所需的能量,只有小部分是驾驶员提供的体能,而大部分是发动机驱动油泵（或空气压缩机）所提供的液压能（或气压能）。动力转向器在这里所起的作用相当于一个控制器。通过动力转向器内部的分配阀来控制能量的走向和大小。     

向过程要质量向质量要效益：—访沙市久隆汽车动力转向器有限公司

沙市久隆汽车动力转向器有限公司立足于激烈的市场竞争中,并发展成目前国内汽车动力转向器产销量最大的厂家之一。“久隆的今天是公司上下向过程要质量,向质量要效益的结果”,陪同采访的久隆公司常务副总经理余晟斌如是说。 沙市久隆汽车动力转向器有限公司于1993年由新加坡基隆投资有限公司与原国有9669厂合资兴建的以生产中、重型汽车动力转向器为主的一家汽车零部件制造企业。公司     

立足行业 着眼未来——访久隆集团常务副总经理吴其洲

湖北久隆集团(原荆州恒隆汽车零部件制造有限公司、沙市久隆汽车动力转向器有限公司)现有资产5亿元,具有年产15万台动力转向器及相关配套件的生产能力,市场占有量30余万台,是目前国内动力转向器品种规格最多,产销量最大的厂家之一。     

从国际车展看汽车动力转向系统的发展趋势

近年来,动力转向在我国汽车转向系统中的就用日益广泛,在2000年6月的国际汽车展览会上,众多的中外参展商展示了他们开发的几代动力转向系统,从中我们可以看出动力转向系统的发展趋势。 一、液压式动力转向系统 该系统的动力源为汽车发动机。发动机提供的机械能经动力转向泵转换为压力能提供给转向器,转向器推动前拉杆进行转向。     

汽车动力转向系的检修

为使汽车操纵轻便及行驶安全,载重汽车尤其大型载货或载客汽车多采用转向助力器(其工作原理见图).动力转向器由机械转向器加上液压助力器组成;它以发动机动力驱动油泵,借助液力通过转向加力装置,来增大驾驶员操纵前轮转向的力量,使之操纵轻便灵敏且安全可靠.     

电子控制液压动力转向技术在混合动力客车上的应用

电子控制液压动力转向技术是通过对传统的液压动力转向器的控制阀进行改造,增加一套通过电子控制的电动旁通阀,根据车速和方向盘的转角,控制进入转向器工作缸的助力油,从而改善车辆在高速时转向器的助力特性。本文主要介绍了电子控制液压助力转向器的组成﹑原理及特点,及其在混合动力客车上应用。     

Yaw damper modelling and its influence on railway dynamic stability

This paper deals with the modelling of yaw dampers and determining the influence of the modelling of this component on the results obtained when predicting the dynamic stability of a vehicle. The first part of the work analyses the influence of the yaw damper characteristics on railway dynamic stability. Following this, a physical model of the damper is developed which allows its performance to be reproduced accurately in the whole range of operating conditions the damper is envisaged to operate in. Once obtained, it was found that the computational cost of the model was relatively high. Therefore, a simplified model has been developed. The simplified model allows obtaining accurate results without excessively increasing the time required to perform the simulations. Analysing the results obtained with this model, it has been concluded that with respect to previous model based on conventional approaches, it improves the accuracy of dynamic calculation for the stability assessment. Also, it has been found that the accurate modelling of the yaw damper is critical when dealing with the vehicle's dynamic performance. In the last part of the paper, a special type of yaw damper was studied as well as its effect on the dynamic behaviour of the vehicle.     

串联式静液传动混合动力车辆功率管理策略

针对串联式静液传动混合动力车辆中,发动机工作状况独立于车轮负载情况,储能元件功率密度大、能量密度低的特点,提出了基于随机动态规划方法的发动机功率管理策略,对发动机工作点进行优化控制.根据传统车辆性能参数配置了串联式静液传动混合动力车辆,以降低燃油消耗为优化目标,对原发动机和减小装机功率的发动机工作情况进行仿真.结果表明...     

一种新型重型越野汽车的可活动上车踏板结构设计

重型越野汽车通常需要将第一阶上车踏板设计成活动的。由于重型越野汽车的使用环境非常复杂,因此活动上车踏板需要性能可靠耐用。本文所描述了这样一种新结构上车踏板。     

Estimation of lateral offset and drift angle for application in secondary collision avoidance system

Recent reports show that the secondary collision on the road gives much higher fatality rate than the other traffic accidents. Many studies have been carried out to prevent the secondary accidents and as a result automotive companies began to introduce brake-based secondary collision avoidance systems. To prevent the secondary accidents it is important to monitor and control the lateral deviation of the vehicle after the primary collision. An estimator for the vehicle’s lateral offset and drift angle based on the in-vehicle sensors and the camera was developed in this paper. By employing sensor fusion scheme and applying extended Kalman filter, the estimator has been designed so that it works even when the camera loses the image of the lanes due to sudden change of the vehicle’s heading angle. For validation of the estimator, simulation has been carried out on various collision scenarios. The simulation results indicated that the estimator of this paper could calculate the vehicle’s lateral deviation with robustness that may be required for application in the secondary collision avoidance systems.     

Optimized dynamic battery model suited for power based vehicle energy simulation

Ever increasing demand for the petroleum is causing faster than expected oil shortages in the supply and demand balance around the world and furthermore, many specialists in the field of oil production such as Association for the Study of Peak Oil and World Energy Outlook are claiming that the petroleum is around the peak of its production (Figure 1). Such shortage made the greatest impact on the gasoline price hikes at the gas pump and thus, this impact was felt by the consumers severely and became the greatest motivation for automotive industries to strive to pioneer the researches for the next generation vehicle configurations ranging from HEV, PHEV, Pure EV to FCHEV (collectively noted as xEV). While the great deal of researches has been carried over the last few decades, it is still far from mass productions for consumer use except for the HEV mainly due to the high cost involved with other types of xEV configurations. Therefore, it is critical to design the vehicle to maximize the use of each component at its highest point regardless of any cost scenarios and it is clear that this optimization can only be achieved through the accurate energy balance simulation for a specific target vehicle prior to the actual hardware implementation. In this paper, it is our intention to introduce modified dynamic battery modeling scheme that would provide a more accurate way of simulating the battery behavior when used in the vehicle energy simulation system. Starting from a typical battery dynamic model to predict the voltage given an imposed current request, we have introduced a new scheme to establish the relationship between the voltage and the power (rather than the current) requested by the vehicle simulation system. The proposed scheme handles the power request from the vehicle simulator considering the dynamic battery characteristics and in turn, contributes to the better estimation of the current integrated energy usage and battery SOC level in the given battery dynamic system used in the vehicle energy simulation system.     

Lateral Dynamics of Commercial Vehicle Combinations A Literature Survey

This paper presents a review of theoretical and experimental works relative to the handling performance of commercial vehicle combinations. A commercial vehicle combination (road train) is defined as a tractor unit and an arbitrary number of trailers. The review contains literature corresponding the most widely used types of trains: tractor-semitrailer, truck-trailer and tractor-semitrailer-semitrailer (doubles). The vehicle dynamic performance has been investigated taking into consideration the following features: directional performance, roll dynamics, braking performance and combined braking and directional performance. With the aim of evaluating the present state of research activities in the field of lateral dynamics of articulated commercial vehicles, the author has compiled some 250 references.     

Dynamics of Automated Guideway Transit Vehicle with Single-axle Bogies

Summary The steering type of a mechanical guidance system has been used for Automated Guideway Transit (AGT) system in Japan. Recently, the single-axle bogie system has developed for AGT vehicle and applied to Yurikamome 7200 type vehicle. This paper describes dynamic characteristics of AGT vehicle with single-axle bogies. Introducing a nonlinear, 15 degree-of-freedom dynamic model, a computer simulation study on the lateral motion of the AGT vehicle with single-axle bogies are carried out. In order to show the dynamic characteristics of the single-axle bogie clearly, it is compared to that of the AGT vehicle with conventional steering system. The simulation study with actual vehicle parameters shows that single-axle bogie has suitable characteristics for AGT system. The multi-body dynamics modeler, DADS, is used to build the dynamic model of AGT vehicle with single-axle bogies and this is used to demonstrate the vehicle motion in actual guideway. Obtained results are compared to that of the field test. It is shown that the vehicle dynamic response can be obtained in realistic situation by using multibody dynamics code, that is useful for designing both vehicle and guideway.     

Dynamics of Automated Guideway Transit Vehicle with Single-axle Bogies

Summary The steering type of a mechanical guidance system has been used for Automated Guideway Transit (AGT) system in Japan. Recently, the single-axle bogie system has developed for AGT vehicle and applied to Yurikamome 7200 type vehicle. This paper describes dynamic characteristics of AGT vehicle with single-axle bogies. Introducing a nonlinear, 15 degree-of-freedom dynamic model, a computer simulation study on the lateral motion of the AGT vehicle with single-axle bogies are carried out. In order to show the dynamic characteristics of the single-axle bogie clearly, it is compared to that of the AGT vehicle with conventional steering system. The simulation study with actual vehicle parameters shows that single-axle bogie has suitable characteristics for AGT system. The multi-body dynamics modeler, DADS, is used to build the dynamic model of AGT vehicle with single-axle bogies and this is used to demonstrate the vehicle motion in actual guideway. Obtained results are compared to that of the field test. It is shown that the vehicle dynamic response can be obtained in realistic situation by using multibody dynamics code, that is useful for designing both vehicle and guideway.     

Lateral Dynamics of Commercial Vehicle Combinations A Literature Survey

SUMMARY

This paper presents a review of theoretical and experimental works relative to the handling performance of commercial vehicle combinations. A commercial vehicle combination (road train) is defined as a tractor unit and an arbitrary number of trailers. The review contains literature corresponding the most widely used types of trains: tractor-semitrailer, truck-trailer and tractor-semitrailer-semitrailer (doubles). The vehicle dynamic performance has been investigated taking into consideration the following features: directional performance, roll dynamics, braking performance and combined braking and directional performance. With the aim of evaluating the present state of research activities in the field of lateral dynamics of articulated commercial vehicles, the author has compiled some 250 references.     

汽车轮胎压力监测系统中的动态天线研究

由于汽车轮胎压力监测系统(TPMS)中的无线温度压力传感器安装在轮毂上,金属的轮毂、车身以及轮毂的转动对无线传感器天线的性能影响很大,使TPMS的性能下降。针对该问题提出将无线传感器天线、轮毂、车身看作一个动态天线,建立动态天线的三维电磁场仿真模型,并将仿真得到的动态天线参数用于无线传感器天线的匹配电路设计。道路试验显示:设计的TPMS系统安装在汽车轮毂上且处于运动状态时,性能良好,说明动态天线的三维电磁场仿真模型可用于TPMS的优化设计。