报告从竞争环境、市场环境、政策环境、分类环境、区域环境等几个方面进行了分析及评论。

报告从竞争环境、市场环境、政策环境、分类环境、区域环境等几个方面进行了分析及评论。

报告从竞争环境、市场环境、政策环境、分类环境、区域环境等几个方面进行了分析及评论。

Automatic transmission changes gears automatically when a vehicle moves. Automatic transmission systems are simple to operate and help to reduce the driver fatigue caused by changing gear ratios manually. Automatic transmission systems have gained wide acceptance among consumers worldwide, especially in emerging economies as heavy traffic and crammed streets make shifting gears an undesirable task. Automatic transmission systems are more powerful and cost less to maintain than manual transmission systems.

An EVC, technically known as EVSE, is an electrical device that consists of a box with a cord and a plug. It is used to connect the electric power source, such as a wall socket, to an EV and recharge the batteries installed in the EV.

The prices of fuel are rapidly rising worldwide, and the consequences of global warming are increasingly becoming inevitable. In such a scenario, there is an urgent need for technologies that would reduce greenhouse gas emissions and fuel expenditure. Hybrid technology vehicles, such as off-highway hybrid commercial vehicles, offer the most viable solution to this problem. Off-highway hybrid commercial vehicles find their applications mainly in three sectors: Agriculture, Construction, and Mining. Agricultural activities across the world are expected to increase in the future. In addition, infrastructure projects worldwide are expected to increase, especially in emerging economies. Both these scenarios would lead to an increase in the demand for off-highway commercial vehicles, and hybrid technology used in such vehicles would prove to be beneficial to consumers.

基于一台可变压缩比SI单缸发动机,在不同EGR率(0~20%)、不同压缩比(8∶1~11∶1)条件下,对发动机动力性和经济性进行对比分析研究。结果表明:发动机的有效热效率、IMEP和功率在EGR率较小时变化均不明显,但随着EGR率继续增大,三者都迅速下降。而增大压缩比会使有效热效率、IMEP和功率在不同程度上都有所升高。同时,在全负荷或定负荷工况下,有效燃油消耗率总体上随EGR率的增大而升高,但在EGR率较小时变化比较平缓。随着压缩比增大发动机有效热效率越高,燃油利用率越高,有效燃油消耗率逐渐降低。

为满足当前日益严格的油耗和法规要求,增压直喷技术越来越成为发动机标准的动力配置。各主机厂及设计机构纷纷研发高性能增压直喷发动机。增压器的广泛应用,带来了一系列新的技术难题,如基础增压压力高问题。基于典型增压直喷发动机的开发,分析了基础增压压力的概念,阐释了必须面临的基础增压压力高的新型问题,找出了解决此问题的设计优化方案。最后,通过台架试验和整车试验充分验证了增压直喷发动机基础增压压力高所带来的问题,以及降低基础增压压力后的表现。

通过柴油机转速、车辆行驶速度、驱动力、扭矩及油门齿杆位置关联关系研究,提出一种装车条件下柴油机扭矩获取的技术方法,并根据使用环境条件进行扭矩标定。重点解决了装车条件下,由于柴油机扭矩测取困难,无法对动力性、经济性准确识别的问题。其结论对柴油机性能状态监测及状态评估有着重要意义。

根据一款WG增压柴油机原机的基本结构参数和试验数据,匹配一款VNT废气涡轮增压器,建立VNT增压柴油机的GT-Power一维计算模型,并对柴油机外特性工况和ESC工况进行仿真计算研究。分别以动力性和经济性参数为分析指标,对外特性工况和ESC工况的VNT开度进行优化选择。研究表明,开度优化选择后的VNT柴油机与柴油机原机相比,外特性转矩均有较大幅度提高,最大转矩工况的运行范围拓宽,且VNT增压器的转速在整个转速范围内提高,联合运行曲线的高效率范围扩展;ESC工况加权比油耗值下降幅度约为3.8%,且空燃比增大,VNT柴油机经济性获得提升。可以得出结论,VNT可变涡轮增压器与柴油机匹配良好。