重型商用车桥轻量化研究

汽车轻量化是一个永远不会过时的话题,时代在进步,技术在更迭,总有新的技术登上舞台,也会有老旧技术被淘汰,文章就重型商用车桥轻量化技术的现状和发展趋势进行简要阐述。     

重型商用汽车前牵引装置设计

本文通过对国内外重型商用车的前牵引装置进行对比分析,设计了一种能够满足不同工况的汽车前牵引装置,并对其强度进行了计算,满足欧盟法规要求,对结构进行了优化,达到了轻量化的设计目的,重量等性能指标均满足使用要求。     

重型商用汽车排气系统流场分析

随着机动车辆尤其是重型商用车辆的增加,车辆废气、噪声等问题已成为影响人们日常生活的严重问题,而目前的排气系统存在不能有效的降低发动机排气噪声,同时排气阻力大,发动机功率损失较大,增加了耗油量。本文通过对某商用车型排气系统进行数值模拟,计算得到了其内部压力、速度、温度等参数的分布情况。根据分析结果,对消声器的内部结构进行了优化。改进后,内部流场的压力分布均匀,腔中大的湍流明显减少,避免二次噪音的出现,温度在两腔中变化明显,出口温度有所降低,消声器总体性能得到改善。     

Rollover prevention for heavy trucks using frequency shaped sliding mode control

Control and handling of heavy commercial vehicles carrying liquid cargo are influenced by liquid movement within the partially filled tank. During steering and braking maneuvering tasks, the truck may exhibit unstable behavior at lateral acceleration levels of 0.3 g to 0.4 g [m/s²]. The fluid slosh forces and dynamic load transfers in the lateral and longitudinal directions and parametric uncertainties caused by moving liquid cargo affect the overall dynamics of the vehicle. To solve a physical problem about the minimal excitation of the slosh dynamics associated with the longitudinal and lateral excitation of the vehicle, dynamic sliding surface design combined with recursive backstepping algorithm is introduced. Compensator dynamics are introduced in the sliding mode through a class of switching surfaces which has the interpretation of linear operators such that the resulting closed-loop system retains the insensitivity to uncertainties in the sliding mode while minimizing the excitation of flexible modes and unmodeled dynamics. The frequency shaped backstepping sliding mode algorithm, proposed by Acarman and Özgüner [Frequency shaping compensation for backstepping sliding mode control. Paper presented at the 15th IFAC World Congress, Barcelona, Spain, 2002], is designed to stabilize and to attenuate the sloshing effects of moving cargo by properly choosing the crossover frequencies of the dynamic compensators in accordance with the fundamental frequencies of the slosh dynamics.     

奇瑞的商用车图谋

在重卡项目取得阶段性成果后,奇瑞商用车计划的下一个目标是推进中卡和轻卡的产品和产能布局。     

重型商用汽车轻量化研究

轻量化是汽车设计水平的一项关键指标,而谈起汽车轻量化,行业内往往关注的是乘用车的轻量化技术重型商用车的轻量化技术往往被忽视,本文就重型商用车轻量化技术的现状和发展空间及瓶颈做简要阐述。     

商用车驾驶室外观造型的模糊评价

通过建立模糊评价模型,提出了对商用车驾驶室外观造型的模糊评价方法。基于此评价方法,将以往商用车驾驶室外观造型的定性评价转化为定量评价,解决了商用车驾驶室开发中外观造型评价存在的问题,使评价方法在综合性、合理性、科学性等方面得到了改进。     

Design of 2-speed transmission for electric commercial vehicle

As environmental and economic interests increase, the need for eco-friendly vehicle such as an electric vehicle (EV) has increased rapidly. Various research of enhancing EV powertrain efficiency and relibility have been studied. In this study, 2-speed shift gears mechanism is designed by using simpson type planetary gear train. This transmission has two planetary gear unit. Gear position is determinded by which ring gear is fixed. Internal components of the transmission are designed for satisfying the required specification of EV. We analyze gear strength, gear mesh efficiency, and transmission efficiency. By manufacturing the transmission prototype and performing some experiments, we verify the application suitability of this transmission.     

“质”创未来的东风商用车

注重节能减排的东风商用车此次参加上海车展,体现了一个企业强烈的社会责任感和价值观;追求技术创新、不断自我完善的严谨态度。在第十四届上海国际车展上,东风商用车带来了全新的"ECO LIVE"绿色     

解析商用车出口市场

汽车出口秩序的规范有利于扩大出口。预计,近期中国汽车"走出去"的趋势不会改变,整车出口短期内仍然以商用车为主,出口市场向多元化发展。     

霍尼韦尔商用车的全面解决方案

更严格的排放规定、更高的燃料效率要求和更优良的路上性能……商用车制造商从未碰到过如此高的要求。通过横跨全球而又能反映区域市场条件的伙伴合作计划，霍尼韦尔与主机厂商共同努力来应对这种挑战。为客户提供基于增值服务和尖端技术的支持。     

Characteristic analysis of vehicle rollover accidents: Rollover scenarios and prediction/warning

Rollover accidents are relatively more serious than other types of accidents, so it is important that the safety device functions appropriately. For the safety device to work correctly, a rollover criteria system which can predict a rollover is needed. To Figure out the characteristics of rollover, NASS-CDS was used to statistically analyze the seriousness of accident and passenger injuries in various rollover situations. Typical scenarios for each rollover type were established by referring to the test criteria of NHTSA. Rollovers can be largely categorized into tripped or un-tripped rollover depending on the situation, but there is no method for estimating the velocity of the car in each situation. This paper suggests methods for estimating the car velocity through finding the relationship between car velocity and quarter turns by performing repetitive simulation in established typical scenarios. Additionally, simple physical models for rollover were developed and each model was analyzed to find the rollover criteria for each type. The rollover criteria were verified by simulating various rollover situations. The rollover criteria suggested would be helpful in predicting a rollover and appropriately activating the safety device.     

Rollover risk prediction of heavy vehicles by reliability index and empirical modelling

This paper focuses on a combination of a reliability-based approach and an empirical modelling approach for rollover risk assessment of heavy vehicles. A reliability-based warning system is developed to alert the driver to a potential rollover before entering into a bend. The idea behind the proposed methodology is to estimate the rollover risk by the probability that the vehicle load transfer ratio (LTR) exceeds a critical threshold. Accordingly, a so-called reliability index may be used as a measure to assess the vehicle safe functioning. In the reliability method, computing the maximum of LTR requires to predict the vehicle dynamics over the bend which can be in some cases an intractable problem or time-consuming. With the aim of improving the reliability computation time, an empirical model is developed to substitute the vehicle dynamics and rollover models. This is done by using the SVM (Support Vector Machines) algorithm. The preliminary obtained results demonstrate the effectiveness of the proposed approach.     

多状态节油开关在某商用车上的应用

多状态节油开关可以实现同一发动机不同功率转换,使柴油机始终处于最佳经济区域内运转,实现节油降耗。本文主要介绍了某种多状态节油开关的原理及其工作过程。     

商用车车载CAN网络系统设计思考

本文首先描述了商用车车型特性的多样性、配置复杂多变性以及面对强势供应商网络整合的难度,主机厂在面对这些情形时都会给网络设计带来极大的不便和挑战,然后从开发流程、系统架构、网络协议、诊断设计、网络管理等方面分析了不同方案的优劣及推荐方案,从平台化的角度规划未来若干年以及不同车型、不同配置的CAN网络平台,平台化的设计理念对整车厂及供应商都具有重要的意义.     

东风商用车驶入发力车道

燕舞春风花遍地,鸡鸣盛世喜盈天。东风商用车公司2005年1月产销为近年来最好水平:生产汽车20800辆,同比增长107%;销售汽车13616辆,同比增长100%。其中重型货车销售同比增长137%,中型货车销售同比增长61%,客车销售同比增长90%。东风商用车公司2005年确立科学的发展观:在2004年形     

商用车电子控制制动技术

从车辆制动安全系统的发展趋势来看,EBS电子控制制动系统将是未来市场的主要占有者。威伯科开发的这套适用于商务车的EBS在欧洲已经得到广泛应用,中国国内汽车厂家也进入到样车试制阶段。[编者按]     

奔驰商用车绿色动力技术

为了能将按欧IV／V,废气排放原本很少的微粒排放进一步降低。考虑通过一种微粒捕集器对废气后处理系统加以补充。想必这样可以对按欧V业已明显降低的微粒排放还要降低50％以上。[编者按]     

高歌猛进戴克集团商用车

业务大幅增长 在2003年业务增长的基础上,戴克集团商用车业务在2004年取得了大幅度的增长.     

2011年商用车市场深度分析及2012年预测

简要描述了2011年商用车及其细分车型市场的走势特征；详细分析了影响各类车型涨跌走势的深层原因；最后重点阐述了影响2012年度商用车市场发展的利好、利差因素，同时给出了2012年商用车各细分车型的市场需求增长率预测。