报告从宏观政策环境、地方政策动态、竞争对手情报、产品与技术创新等几个方面进行了分析及评论。

报告从宏观政策环境、地方政策动态、竞争对手情报、产品与技术创新等几个方面进行了分析及评论。

An automatic transmission (also called automatic gearbox) changes gear ratios automatically as the vehicle moves. CVT is a form of automatic transmission that helps to change gears faultlessly through an infinite number of effective gear ratios. The CVT replaces the planetary gear set of a standard automatic transmission with two variable-diameter pulleys, each shaped like a pair of opposing cones, with a metal belt or chain running between them.

Head gaskets are a vital part of an engine and perform the critical function of sealing the engine block and cylinder head. Recent changes in the design and material composition of head gaskets are a result of changing technological trends and evolving engine specifications. In an internal combustion engine, for example, the mixture of air and fuel is ignited by the spark plug to create pressure and enable the pistons to rotate in the cylinder chambers. The head gasket ensures that the pressure created by the ignition of this mixture stays inside the combustion chamber. The different types of head gaskets available in the market include MLS, solid copper, composite, and elastomer.

Friction materials are used in systems that require contact interaction between two or more parts. A friction material is used as an additive in automotive brakes; its function is to resist sliding contact between itself and another surface in a controlled manner. This enhances the vehicle’s performance and braking efficiency. Other uses of friction materials are in automatic transmissions of vehicles, and in agricultural and industrial machinery.

针对在汽车Trimmed Body有限元模态分析中弯曲模态和扭转模态比较难识别的问题,在其左右两侧各取若干个对称的能够代表车身轮廓的点,经过VTF分析输出这些点的加速度幅值曲线,并对曲线进行相应处理。根据处理得到的合成加速度均值曲线和差值加速度均值曲线,结合模态分析的振型结果,能够较准确快捷地找到该Trimmed Body弯曲模态和扭转模态的频率值。

为准确考核及评价汽车变速器同步器磨损寿命,根据同步器的磨损特征,结合道路使用试验、换挡载荷谱的采集与处理以及疲劳磨损理论模型,建立了同步器磨损寿命预测的计算模型和评价方法。利用所建立的模型和评价方法,通过台架试验对某微型车AMT同步器磨损寿命进行了考核及评价。结果表明,所建立的同步器磨损寿命预测模型可准确预测和评价同步器磨损寿命,与实际磨损量的最大误差在15%以内。

针对嵌入式车辆动力学仿真平台开发需求,基于吉林大学汽车仿真与控制国家重点实验室的车辆动力学模型,研究了基于d SPACE环境的车辆动力学模型编译、运行控制、参数赋值等关键方法。基于d SPACE嵌入式仿真平台与离线仿真平台验证了车辆动力学模型侧向加速度和横摆角速度的一致性,以及仿真控制策略的可行性和正确性。