New lead-acid battery management system based on generator regulation

A novel regulation system for a vehicle generator and lead-acid battery is proposed in this paper. By integrating the regulation method, the output voltage of the generator is determined and controlled by the algorithm to save electrical energy and protect the lead-acid battery. The regulation algorithm is implemented in Matlab/Simulink, and the logic function of the system is verified using the dSPACE/AutoBox workbench. The experimental results show that the new algorithm improves the performance of the fuel economy of the vehicle and the battery state-of-health compared to the traditional control method.     

Prediction of Tyre-Road Friction with an Inverted-Boat Shaped Pressure Distribution

In this paper, a predictive model is formulated to describe the frictional forces between the tyre and road. The model is based on an inverted-boat normal pressure distribution. The determination of the input parameters is simplified by the suggested stationary point approach for calculation of the frictional coefficients, which are analytically obtained. The verification of the established model shows that the predicted values are in a good agreement with measured data. A sensitivity study of the shape factors demonstrates that it is necessary to take the unsymmetric normal pressure distribution proposed in this paper into consideration to accurately predict frictional forces.     

汽车主动避撞系统的发展现状及趋势

阐述了汽车主动避撞系统的实现思路和结构,重点介绍了状态识别、安全状态判断、系统控制理论方法等关键技术,指出了汽车主动避撞系统研究中存在的一些问题及发展趋势.     

发动机无损检测应用分析

介绍了利用电感耦合等离子体发射光谱仪进行金属磨损分析的无损发动机检测技术,并在列举了利用金属磨损分析的发动机无损检测技术的应用实例。实践证明：这种发动机无损检测技术值得广泛推广与应用。     

橡胶履带啮合副的受力分析与稳定工作区的建立

通过简化ＣＴＷ１２型全地面越野车的橡胶履带行走机构，建立啮合副物理模型。在受力分析的基础上，建立力学模型，确定传动件半径、压力角与中性层位置之间的关系，最后找出传动件随载荷变化在驱动轮齿上的稳定工作区，为设计合理的橡胶履带啮合副提供理论依据。     

Intra-Platoon Collision Behavior during Emergency Operations

This paper presents current research regarding intra-platoon collision dynamics for rapid decelerations. Measures of ride quality and impact severity are introduced to allow comparisons between different collision scenarios. In this study, the disturbance input to the platoon is assumed to be a rapid braking of the lead vehicle. Several deceleration rates are used to assess the overall platoon behavior and the effect of the intra-platoon collisions on the platoon passengers. The role of the desired headway spacing on preventing the occurrence of intra-platoon collisions and improving rider comfort is discussed.     

车用柴油机共轨式电控喷射系统关键技术的仿真与实验研究

介绍了中压共轨系统（PAIRCUI）和高压共轨系统（FIRCRI）的原理与特点，并用计算机仿真与实验方法研究了其中的关键性结构参数对喷油规模的影响。最后介绍了通用于这两种共轨系统以及双燃料天然气发动机控制的ECU，以及电控发动机的MAP标定技术。     

柴油-酒精混合燃料发动机的性能研究

在分析柴油—酒精混合燃料物理化学特性的基础上，研究了不同混合比例的柴油—酒精混合燃料发动机的性能。研究表明：柴油醇燃料发动机的有效燃油消耗率较柴油机的升高，而有效能耗率有一定程度的降低；发动机的碳烟排放明显降低，在保持同样排温的前提下，其功率有一定程度的升高，尾气排放明显降低；柴油机使用混合燃料后，滞燃期延长，燃烧持续期缩短。在采用推迟供油的条件下，柴油—酒精混合燃料发动机的尾气排放性能可以得到较大幅度的提高。     

电控单体泵柴油机面向欧Ⅲ排放的调整方法

电控单体泵高压燃油喷射系统具有使发动机达到欧Ⅲ排放标准的潜力,研究在自行开发的单体泵柴油机的ECU上,进行了面向新法规测试规程的标定调整方法研究。指出在满足整机基本性能要求的前提下,对稳态测试循环(ESC)测试方法所指定的工况区,进行更细网格的喷油量和正时的匹配标定工作,并使整个区域内不出现尖点。试验结果表明,整机的气体排放物已达到或接近欧Ⅲ排放标准。     

多孔材料垂直渗透系数测定装置的研究

在对渗透系数影响因素的分析研究基础上,针对原有渗透仪在侧漏、低水头下测量困难等缺点,就测压管位置、测压管直径、测量用水及试件尺寸方面规范化多孔渗透系数测定仪。为减少试件表面附着的气泡,采用抽真空后,而不采用分层浸泡的方法。最后就渗透测定仪装置提出几条改进建议:用充气气囊代替柔性侧壁,用差压计代替微压计。实践证明本仪器使用稳定,数据重复性高。