特定工况下自动变速器汽车驾驶技术研究

对装备自动变速器的汽车在某些特定工况下的正确驾驶技术，如发动机的起动、汽车起步、超车、临时停车、倒车、停放及进入车库，被牵引，以及恶劣天气下的行驶等进行研究，从而为提高这类车辆的使用可靠性、降低其运营成本和延长其使用寿命提供可靠的保证。主题词：汽车自动变速器驾驶技术研究     

Handling qualities evaluation method based on actual driver characteristics

The present study proposes an objective handling qualities evaluation method using driver-in-the-loop analysis. The driving simulator experiments were performed for various driving conditions, drivers and vehicle dynamics. The response characteristics of the driver model and the closed-loop system were analyzed. The analysis revealed the driving strategies clearly, indicating the importance of closed-loop analysis. Using the identified driver model and its strategies, a cost function of the handling qualities was constructed. The cost function can be used to estimate the handling qualities analytically from the vehicle dynamics. The proposed method was validated by comparison with the handling qualities evaluation rated by the driver's comments.     

纯电动汽车永磁同步电机引起车内啸叫的分析及优化

纯电动汽车永磁同步电机是影响整车的NVH性能主要激励源之一,通过对驱动电机定子的分析与优化,能有效降低电机谐频激励,减小电机振动,从而提高整车NVH舒适性。文章以一款纯电动车型为例,重点讲述通过测试排查减速能量回收车内啸叫问题,确认驱动电机24阶、48阶激励通过结构和空气传递到车内,引起车内中高频啸叫声,最终优化驱动电机定子绕组得以改善,达到优化车内噪声的目的,为纯电动汽车NVH性能开发和优化提供参考与借鉴。     

基于西安市工况的纯电动汽车仿真分析

文章基于聚类分析结果,使用比功率分布方法构建出西安市2路公交线路拥堵、比较通畅、通畅三类工况和综合行驶工况。基于Cruise搭建纯电动汽车整车模型,并基于所建综合行驶工况对纯电动汽车进行仿真分析。     

运用盾构掘进参数跟踪判断滚刀损坏的研究

目前盾构滚刀磨损的判断通常是经验性的。文章在文献[6]运用盾构掘进参数判断刀具损坏的分析计算方法基础上,进一步考虑了土舱压力的影响,对掘进速度和刀盘扭矩计算模型进行了修正;依托具体工程实例,运用修正计算模型分别对土压平衡盾构、泥水平衡盾构以及TBM等在硬岩中的掘进数据与滚刀情况进行了跟踪判别研究。结果表明,计算结果与滚刀磨损情况比较吻合,该方法对判断滚刀损坏具有可行性、参考性。     

Development of Malaysian urban drive cycle using vehicle and engine parameters

Vehicles travelling in actual urban areas are mostly in idle, low or medium speeds, which reflects engine part-load condition. These regularly visited engine conditions, in reality affect the fuel economy during actual driving. Thus, understanding the characteristics of the actual driving conditions will enable many other benefits besides legislation. This paper presents the development of a preliminary Malaysian urban drive cycle with the inclusion of the engine parameters and characteristics, acquired through an actual urban driving on numerous urban roads in Malaysia that represents the actual consumer’s daily driving experience. The actual engine parameters and its characteristics are integrated into the assessment measures in an attempt to formulate representable drive cycle and fuel consumption data. The initial drive cycle is composed of 17 sequences selected from the actual on-the-road conditions to represent the Malaysian urban driving. The average fuel economy of the established Malaysian urban drive cycle was then measured on a test bench using the same engine from the vehicle. The recorded fuel economy with Malaysian urban drive cycle is 8.5% below the actual Malaysian urban driving which is closer estimation to the actual driving compared to the current in-practice NEDC which shows to be 43.1% below the actual Malaysian urban driving. Thus, Malaysian urban drive cycle is better in representing the Malaysian urban driving conditions compared to the NEDC in terms of the average fuel economy measurements.     

运行图在多模拟器追踪仿真中的应用研究

本文介绍借助ADO技术建立VC++与SQL Server的通信,通过分析列车时刻表的构成,使用相关算法自动快速生成列车时刻表,并画出相应的列车计划运行图的方法.同时对列车运行图在多模拟驾驶器追踪仿真中的运用也进行了介绍.     

Application of a driving simulator to the development of in-vehicle human-machine-interfaces

The use of a driving simulator in the development of human-machine-interfaces (HMI) such as a navigation, information or entertainment system is discussed. Such use addresses the need to study and evaluate the characteristics of a candidate HMI early in the R&D and design stage to ensure that it is likely to meet various objectives and requirements, and to revise the HMI as may be necessary. Those HMI requirements include such things as usability, driver comfort, and an acceptable level of attentional demand in dual task conditions (driving while using an HMI). Typically, such an HMI involves an information display to the driver, and a means for driver input to the HMI. Corresponding simulator requirements are discussed, along with typical simulator features and components. The latter include a cab, control feel systems, visual image generator, real time scenario control (task definitions), a motion system (if provided), and data acquisition. Both fixed and moving base systems are described, together with associated benefits and tradeoffs. Considerations in the design of the evaluation experiment are discussed, including definition of primary and secondary tasks, and number of driver subjects (experimental participants). Possible response and performance measures for the primary and secondary tasks are noted, together with subjective measures such as task difficulty and ease of using the HMI. The advantages of using a driving simulator to support R&D are summarized. Some typical and example simulator uses are noted.     

地道桥引道纵断设计浅析

结合工程实例,论述了地道桥引道纵断设计时,如何合理确定竖曲线的最小半径和最小长度,从而保证汽车的行车安全。     

驱动桥壳有限元分析模型的改进

针对目前常用的驱动桥壳有限元分析模型中由于边界条件定义造成结果不准确的问题,在分析模型中引入了板簧的弹性特征,并按不同的边界条件对桥壳应力分布进行了计算。结果表明,按照传统约束方式计算,板簧座外侧桥壳应力高,板簧座内侧桥壳应力位于低;按新建立的边界条件计算,则高应力区将向板簧座内侧的桥壳扩展。测得弯曲及扭转工况下桥壳的应力结果表明,采用常用边界条件所得位于板簧座内侧的桥壳应力计算结果与实际相差接近50%;引入板簧元件后桥壳应力的计算结果则与试验结果相近。