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。

Mini excavators, commonly known as compact excavators, are tracked or wheeled vehicles. They weigh approximately 0.7 to 8.5 tons, and are unique compared to other excavators. Due to their small size, mini excavators can fit through doorways and can be used to carry out work at mining sites. Also, mini excavators can be easily craned anywhere or can be transported by an average truck with a trailer hitch. Mini excavators come with huge benefits. One of the major benefits of the equipment is its easy transportation from one site to another. In addition, it has various other attachments that can be used for drilling holes, digging trenches, and breaking rock.

E2W is a term used for electric motorcycles, scooters, and bicycles. They are powered by batteries instead of liquid fuel. E2Ws consist of a DC motor, controller, battery, and charger instead of an ICE, as used in liquid fuel-powered two-wheelers. E2Ws are considered more environment friendly as well as a fuel saving alternative in comparison with liquid fuel-powered two-wheelers, and are a sound choice for short-range travel requirements. E2Ws have become one of the successful mass-produced and adapted alternative-fuel vehicles since the start of motorization.

A truck is a vehicle used to transport materials and other goods from one place to another. The various categories of trucks include light duty trucks, medium duty trucks, and heavy duty trucks. Heavy duty trucks are trucks that have a GVWR greater than 26,000 lb and are usually used for performing heavy duty work such as heavy duty loading/pick-up and concrete mixer applications used in construction.

在一台直喷式涡轮增压柴油机上分别燃用4种不同硫含量的柴油,研究了燃油硫含量对柴油机排放性能的影响。研究结果表明,燃油硫含量对柴油机的烟度有直接影响,随着燃油硫含量的降低,柴油机的烟度明显下降,低负荷下燃油硫含量对柴油机的烟度影响较大,NOx排放随燃油硫含量的降低变化很小,而CO和HC排放则降幅明显,SO2排放随柴油机负荷的增加显著上升,随燃油含硫量的降低而显著下降。

以整车NEDC循环为标准,对比NEDC循环中的工况点油耗量的权重,优化高油耗率工况点,能够更直接地降低整车循环油耗。本文基于NEDC循环中高油耗权重的发动机工况点,研究采用两段式可变气门升程技术对NEDC循环综合油耗的影响,并分析说明使用小升程气门曲线能够降低油耗率的原理。结果显示,此款发动机使用两段式可变气门升程能够有效降低NEDC循环油耗约2.5%。

介绍国内非常规道路用两轮摩托车的行业现状、标准要求及行业管理办法,分析行业现阶段存在的问题及未来的发展方向。

为降低轮毂电机转矩脉动对电动汽车平顺性的影响,提出了开关磁阻电机的控制策略。建立了电机的非线性模型,对电机进行了最优角度控制。针对电机转矩脉动问题,首先在直接转矩分配控制基础上,采用模糊算法对传统PID控制器的参数进行在线整定,其次提出将快速终端滑模控制算法与直接转矩分配相结合的控制策略。仿真结果表明,模糊算法的引入提高了系统的稳定性;而快速终端滑模控制算法不仅提高了系统抗干扰的能力,而且降低了电机的转矩脉动。