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Development of a Hydraulic Hybrid System for Urban Traffic

机译：城市交通液压混合系统的开发

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The development of today's powertrains focuses on the reduction of CO_2 emissions. Therefore several new technologies for internal combustion engines have been established. A further tendency is the successive electrification of powertrains in hybrid vehicles. However, these trends lead to increasing system costs which are a very important aspect at the market segment of compact cars. At the Institute of Internal Combustion Engines of the Technical University of Munich a drivetrain concept for urban and commuter traffic is under development. It is based on a lean-burn air-cooled two-cylinder natural gas engine which is combined with a hydraulic hybrid system. The paper contains detailed information about the engine as well as the hybrid vehicle powertrain in parallel structure. Particular characteristics and innovations of the hydraulic hybrid system compared to systems known so far are shown. The size of the hydraulic pump is chosen in consideration of low pump losses and suitable torque in combination with the engine map. Furthermore, the paper puts emphasis on the selection of the hydraulic storage type regarding system efficiency, complexity and package. Subsequent to the description of the hybrid system, the results of an entire vehicle simulation of the parallel hydraulic hybrid powertrain are presented and discussed. In summary, the paper describes concept, design and simulation results of a two-cylinder natural gas engine combined with an innovative hydraulic hybrid system in parallel structure.
机译：今天的发动局的发展侧重于减少CO_2排放。因此，已经建立了几种用于内燃机的新技术。进一步的趋势是混合动力车辆中的动力传递电流的连续电气化。然而，这些趋势导致系统成本提高，这是紧凑型汽车市场部分的一个非常重要的方面。在慕尼黑技术大学内燃机内燃机研究所，为城市和通勤交通的动力传动系统概念正在开发。它基于瘦燃烧的空气冷却的双缸天然气发动机，该天然气发动机与液压混合系统结合。本文包含有关发动机的详细信息以及并联结构中的混合动力车辆动力系。与迄今已知的系统相比，液压混合系统的特殊特性和创新。考虑到低泵损失和合适的扭矩与发动机地图相结合，选择液压泵的尺寸。此外，本文强调了对系统效率，复杂性和包装的液压储存类型的选择。在混合系统的描述之后，呈现并讨论了并联液压混合动力系的整个车辆模拟的结果。总之，本文介绍了双缸天然气发动机与平行结构的创新液压混合系统结合的概念，设计和仿真结果。

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