某型轿车底盘油管成形工艺及模具设计

通过分析某轿车底盘油管的试制成形工艺，改进了原加工工艺方案及加工方法，设计制造了具有快换式凸模结构的扩口模，从而减少了模具数量，降低了加工费用。生产实践证明：该模具结构合理、可靠、工作稳定，能保证产品质量，对相同类型零件的模具设计具有参考作用。     

现代大客车技术分析

通过对国内外大客车三大总成的最新技术进行分析，探讨我国大客技术的发展方向。     

交叉变轮距底盘机械式可变特性转向系统研究

分析了变轮距车辆的转向要求及常用转向方法;介绍了一种利用双对角线几何原理实现轮距可变特性的交叉变轮距车辆底盘技术;针对目前国内的机械式转向系统一般不能满足变轮距车辆的转向要求的现状,提出了一种利用基于阿克曼梯形转向机构的可变特性转向单元实现交叉变轮距底盘机械式转向的技术方案。分析结果表明,该方案不仅可以较好地实现交叉变轮距底盘的前轮转向和四轮转向,而且降低了转向机构及其控制程序的复杂程度,提高了转向精度和可靠性,具有较高的理论研究和推广应用价值。     

利用比对试验的方法考核"DPC-1型底盘测功机"的精度

本文通过采用同一辆受试摩托车在三种不同摩托车底盘测功机上进行比对试验的方法，考核分析了天津大学科达测控技术公司研发的“DPC-1型底盘测功机”的测试数据的准确性和精度。     

一种工程机械可伸缩式底盘结构设计

介绍一种工程机械可伸缩式底盘结构,其特点在于左伸缩臂和右伸缩臂分别与相应伸缩孔相配合,收拢状态时其中之一重叠入另一个的内部,使得该结构伸缩量更大、结构更简洁,且伸缩臂与伸缩孔具有更大的重叠度.该结构伸缩臂方钢管与伸缩孔方钢管横截面采用"◇"形布置,可实现自动定位,大大提高了底盘结构的刚度与稳定性.     

Effects of ethanol-blended gasoline on air pollutant emissions from motorcycle

The effect of ethanol-gasoline blends on criteria air pollutant emissions was investigated in a four-stroke motorcycle. The ethanol was blended with unleaded gasoline in four percentages (3, 10, 15, and 20% v/v) and controlled at a constant research octane number, RON (95), to accurately represent commercial gasoline. CO, THC, and NOx emissions were evaluated using the Economic Commission for Europe cycle on the chassis dynamometers. The results of the ethanol-gasoline blends were compared to those of commercial unleaded gasoline with methyl tert-butyl ether as the oxygenated additive. In general, the exhaust CO and NOx emissions decreased with increasing oxygen content in fuels. In contrast, ethanol added in the gasoline did not reduce the THC emissions for a constant RON gasoline. The 15% ethanol blend had the highest emission reductions relative to the reference fuel. The high ethanol-gasoline blend ratio (20%) resulted in a less emission reduction than those of low ratio blends (< 15%). This may be attributed to the changes in the combustion conditions in the carburetor engine with 20% ethanol addition. Furthermore, the influence of ethanol-gasoline blends on the reduction of exhaust emissions was observed at different driving modes, especially at 15 km/h cruising speed for CO and THC and acceleration stages for NOx.     

Comparative analysis of H2-diesel co-combustion in a single cylinder engine and a chassis dynamometer vehicle

Concerns as to the adverse effects of diesel engine exhaust on urban air quality have resulted in increasingly stringent emissions legislation, with the prospect of many major global cities potentially banning diesel vehicles. Emissions of nitrogen oxides (NO_x) and particulate matter (PM) are linked to increases in premature mortality, and the simultaneous control of both pollutants through modified combustion strategies presents a significant challenge. In this work, the effects of displacing diesel fuel with hydrogen on exhaust emissions were investigated in both a single cylinder research engine and in a demonstration vehicle. In the initial stage, tests were undertaken on a supercharged, direct injection, single cylinder diesel research engine at different engine loads, intake air pressures and EGR levels. Hydrogen was aspirated with the intake air, and EGR was simulated by supplying the intake pipe with compressed nitrogen gas. The results showed a reduction in CO₂ and particulate emissions with increasing H₂ addition, and an increase in NO_x emissions at H₂ levels greater than 10% of the total input energy to the engine. The next stage involved tests on a chassis dynamometer with a small van equipped with the multi-cylinder version of the single cylinder research engine. The van was fitted with a programmable H₂ augmentation system, with H₂ addition levels specified by accelerator pedal position. During full drive cycle tests conducted with and without H₂ augmentation up to 10%, an average rate of 1 kW of H₂ was supplied to the engine. With H₂ augmentation, over the total drive-cycle, reductions in CO, NO_x and particle number were observed, but a higher total PM mass was recorded.     

汽车底盘设计中参数化技术的运用

在认真研究了国内外关于参数化技术在现代设计中应用的基础上,介绍了参数化设计的基本思想,对参数化技术在汽车底盘设计中的应用作了理论上的初步探讨,针对底盘设计中参数化实现的各个主要环节作了基础方法上的研究。     

轿车底盘铝合金后副车架的压铸技术开发

针对广汽自主品牌"传祺"轿车的底盘铝合金后副车架压铸零件,从压铸合金的力学性能、压铸工艺设计及优化、模具设计及制造、铸件质量控制等方面进行了开发和研究。结果表明,采用耐热密封结构的高真空压铸模具具有良好的密封性能,可靠性高。多区域的温度测量及冷却水流量的实时调节提高了模具温度控制的精度。通过对工艺参数的优化,有效消除了铸件缺陷如裂纹、冷隔、缩孔、缩松等。开发的铝合金后副车架的铸件本体抗拉强度≥240MPa,屈服强度≥145MPa,伸长率≥6%,满足了"传祺"轿车的的使用要求。     

汽车电子技术的发展趋势

电子技术在汽车工业中占有非常重要的地位。它可满足现代化车辆在燃油经济性，排放，安全性，舒适性和动态驾驶等方面的要求。但是对车辆制造商而言，在诸如42V车载电源，独立系统和多煤体技术的集成及软件的开发和使用等方面具有很大的挑战。同时为适应“新经济”的步伐，“经典的汽车工业”必须熟悉其游戏规则以及面对来自计算机和通讯工业新的竞争。