管片式散势器在汽车发动机冷却系匹配设计中的数值模拟

本文介绍了一种散热器性能的计算模型和在系统中系统中如何匹配的优选模型，编制了计算程序，进行了计算与实验的对比分析，表明计算方法是合理的。     

重型汽车冷却系统设计

本文介绍了重型汽车动力装置（发动机附件）冷却系统设计中的主要成就：散热器、中冷器、膨胀箱、护风罩、导风环等的设计与经验数据，通过对散热器的计算分析，认为增加散热器的正面面积和散热片（带）散热管的数量来提高散热能力，比增加散热器厚度来提高散热能力的效果好得多，为此本文提出了提高空气散热效率，提高空气对流传热系数，增加空气传热面积的措施，可供这方面的设计人员、应用维修人员参考。     

APF型发动机电子控制冷却系统

针对目前轿车发动机普遍采用蜡式节温器和电动冷却风扇来进行冷却强度调节时存在的问题，介绍了APF型发动机上应用的电子控制冷却系统。采用该系统时，该系统对发动机只进行较小的改动，即能完成冷却循环的重新布置，使冷却液温度调节、冷却液的循环控制、冷却风扇的控制均随发动机负荷的变化而变化。     

SX6122DK型后置客车底盘冷却系设计及校核计算

本文主要介绍ＳＸ６１２２ＤＫ型后置客车底盘冷却系设计及校核计算。     

发动机冷却系统性能敏感性分析

研究对比了采用名义最大温度和3σ(标准差)最大温度2种方法设计的发动机冷却系统性能水平的不同。研究基于误差仿真分析工具和冷却系统一维仿真模型,模拟得到不同输入参数集组合产生的温度分布。分析了2种设计方法得到的发动机冷却系统在性能、质量以及燃油经济性方面的不同。     

EQ1211C系列载货汽车发动机冷却系统的研究

扼要介绍了汽车冷却系统的设计原则，结合ＥＱ１２１１Ｇ系列车型冷却系统的设计，对该系列车型的散热器、风扇的选用进行了验算，对其中的不足提出了改进意见。     

出口热带地区某重型越野汽车冷却系计算

为校核车辆在热带地区适应性而进行发动机冷却系散热性能计算分析是新产品适应性开发中必须进行的项目。本文通过对某重型越野汽车冷却系计算,并对风扇及散热器等部件能力进行校核,为同类车型设计提供了参考依据。     

重型汽车散热器由铜换铝可行性研究

1前言散热器是汽车发动机冷却系统的主要部件,其作用是将发动机工作过程中产生的热量通过冷却液散发到空气中,因此,散热器性能的好坏直接影响汽车发动机的性能,进而对汽车的动力性、经济性和可靠性等都有很大的影响。     

重型汽车雨刮不工作故障排查

汽车雨刮系统是车辆安全运行的主要保障之一,本文主要介绍了重型汽车雨刮的组成工作原理及雨刮出现不工作故障的排查。     

重型汽车电动车窗的工作原理及故障排查

汽车电动车窗是驾驶室配置的重要组成部分,本文主要介绍了重型汽车上电动车窗的组成部分、工作原理及故障排查。     

Novel evaluation method of fuel consumption and emission for heavy-duty hybrid electric vehicles

This paper is a continuation of a previous paper titled “A novel way to calculate energy efficiency for rechargeable batteries” published on Journal of Power Sources/2012 describing a new method to calculate energy efficiency for rechargeable batteries. The present paper further describes the application of energy efficiency model on the evaluation of fuel consumption and emission for the heavy-duty hybrid electric vehicles (HD-HEVs). A more accurate calculation method of net energy change for power battery pack is proposed based on energy efficiency model of power battery pack. A more simplified and accurate correction method of fuel consumption and emission is also presented based on equivalent mileage. The fuel consumption and emission on chassis dynamometer are measured in the HD-HEVs. The experiment results show that relative errors of fuel consumption and emission between equivalent mileage correction results and linear regression correction results are less than 3%, which verifies accuracy and validates the proposed evaluation method for HD-HEVs fuel consumption and emission.     

关于控制重型汽车NO_x排放方法的研究

近年来随着我国汽车保有量与日俱增,汽车排放污染物已经成为一个非常严峻的问题。NOx是汽车排放污染物的重要组成部分,而重型汽车又是NOx的主要排放源,因此控制重型汽车NOx的排放具有重大现实意义。本文首先介绍了重型汽车主要污染物NOx的生成机理及其影响因素,随后对控制重型汽车NOX排放的EGR系统进行研究。     

重型载货汽车轻量化结构分析

顺应节能减排的大趋势,底盘作为重型汽车的承重和传力机构,轻量化势在必行。本文在对底盘结构轻量化的基本要求进行分析的基础上,介绍了使用CAD软件和CAE仿真分析软件进行有限元分析的方法。最后,结合HYPERMESH实例分析对重型货车底盘轻量化的优化方案进行展望。     

重货企业售后服务评析

据预测,2008年中国重卡市场需求大约56万辆,保有总量约250万辆以上,每年需要多少配件支撑整体重卡市场的保有总量的正常营运?     

Semi-active suspension systems for railway vehicles using magnetorheological dampers. Part II: simulation and analysis

In this paper, the semi-active suspension system for railway vehicles based on the controlled (MR) fluid dampers is investigated, and compared with the passive on and passive off suspension systems. The lateral, yaw, and roll accelerations of the car body, trucks, and wheelsets of a full-scale railway vehicle integrated with four MR dampers in the secondary suspension systems, which are in the closed and open loops respectively, are simulated under the random and periodical track irregularities using the established governing equations of the railway vehicle and the modelled track irregularities in Part I of this paper. The simulation results indicate that (1) the semi-active controlled MR damper-based suspension system for railway vehicles is effective and beneficial as compared with the passive on and passive off modes, and (2) while the car body accelerations of the railway vehicle integrated with semi-active controlled MR dampers can be significantly reduced relative to the passive on and passive off ones, the accelerations of the trucks and wheelsets could be increased to some extent. However, the increase in the accelerations of the trucks and wheelsets is insignificant.     

重型汽车制动轮毂疲劳断裂失效分析

重型汽车制动轮毂在使用过程中发生疲劳断裂事故。对断裂零件失效形貌、断口分析、理化指标测试,发现是因制动轮毂零件外端轴承与相对的轴承孔之间无法保持过盈配合,引起轴承发生松动,导致制动轮毂发生疲劳断裂。     

重卡悬架系统成本分析与价值研究

文章通过对重卡市场现有不同类型悬架系统的成本对比,简要分析了不同类型的悬架系统因成本差异及重量差异对车辆运营收益带来的价值影响,以此期望对重卡企业在悬架系统的改进和提升提供经济性参考;同时,结合重卡轻量化,为助力客户减少运营成本,提升运营收益进行研究探讨。     

A study on speed control law for automated driving of heavy-duty vehicles considering acceleration characteristics (simulation of transient responses)

In order to develop a proper speed control technique for automated driving of heavy-duty vehicles, in the situation of mixed traffic of heavy-duty vehicles and passengers cars, a simulation study is carried out considering the transient characteristics of heavy-duty vehicles in acceleration and deceleration. The control performance is observed and some problems to be solved are listed as follows: (1) to check control performance for time-dependent target speed and distance (2) to improve the control algorithms to suppress chattering of the acceleration.