Based on adoption of worldwide advanced parts and components of heavy duty trucks , steyr series heavy duty truck featuring modularization , seriation , strong power , high reliability , low fuel consumption , low noise and low emission , is the only vehicle whose manufacturing technology was introduced and put on market in series 斯太尔系列重型车,采用世界真正重型汽车零部件总成，具有模块化、系列化、优势动力强劲的优势，可靠性高，低燃油消耗，低噪音、低排放，是国内唯一全面引进并批量投放市场的系列化主要汽车。
This thesis belongs to the research of the third aspect , the conpound drive system is used 1 ; o regenerate the 1oss energy . the low oil consumption and low b1eeder of vehic : le are achieved by way of the orggnic combination of transmission . hydrau1ic pressure and automatic control system , and the compotald drive system works hamonious1y with engine to raise the motive capability effectively 本论文即属于再生制动能量的研究范围，研究以汽车减速及制动能量回收再利用为目的的液压复合驱动系统，通过复合驱动系统中的液压、传动、自动控制三部分的有机结合及与发动机协调工作实现车辆的低油耗、低排放、并有效地提高其动力性能，是现有汽车节能、环保技术所未实践应用的领域。
Hybrid electric vehicle ( hev ) is one of the main types that will be developed in the next twenty years because of its low fuel consumption , low emissions and comparatively easiness for being merchandized . however , as it has at least two sets of propulsion systems , the hardware structure and the energy management system is complex . the optimal match of various components and the optimal combination of a large number of control parameters are therefore required 混合动力电动车(简称hev )因其低油耗、低排放、商品化相对容易，是将来二十年内汽车开发的主要型式之一，但因其具有至少两套动力驱动系统，故硬件结构和能源管理系统都比较复杂，需要找到各类部件的最优匹配和大量控制参数的最佳组合。
Based on the systematical analysis of domestic and overseas agro - vehicle diesel technology status quo and trends , this paper firstly indicates the importance of developing low emission agro - vehicle diesel , and then aimed at the goal of reducing agro - vehicle diesel emission , carries through the calculations of model 680qbkz diesel thermodynamics , dynamics and fatigue intensity checkout , as well as related developments 本文在系统分析了国内外农用车柴油机技术现状与发展趋势的基础上，首先指出开发低排放农用车柴油机的重要意义，然后以降低农用车柴油机排放污染为设计目标，进行了低排放680qbkz型农用车增压柴油机设计中的热力计算、动力计算、疲劳强度校核以及有关的开发工作。
Based on the theoretical analysis and design practice in successful development of allway desiel engine in china , the design concepts of key parts and components of engine , in particular the cylinder block and cylinder head , are analyzed for meeting the requirements for high performance and low emission as well as normal and reliable operation of diesel engine for medium and heavy commercial vehicle under high combustion pressure and high thermal load 摘要结合我国自主开发的“奥威”发动机在设计工作中的理论分析与实践，就低排放中重型商用车柴油机在开发工作中为满足高性能、低排放的要求及在高燃烧爆发压力和高热负荷下正常可靠地工作，对发动机的关键零部件，尤其是缸盖与缸体的设计概念进行了分析。
