...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Fortschritt-Berichte VDI, Reihe 12. Verkehrstechnik-Fahrzeugtechnik >Novel Valvetrain Design as Enabler for compliance with upcoming stringent emission demands in urban operation
【24h】

Novel Valvetrain Design as Enabler for compliance with upcoming stringent emission demands in urban operation

机译：新颖的Valvetrain设计为符合即将到来的城市经营中的严格排放需求的推动者

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Lower fuel consumption and reduced emissions are the main drivers for the development of new powertrains for light commercial vehicles. Therefore, technologies like cylinder deactivation, which reduce fuel consumption, improve CO_2 figures as well as thermal management of the exhaust aftertreatment system are highly attractive. In order to allow the usage of cylinder deactivation as soon as possible after engine start, Eaton has developed an innovative electro-mechanical variable valvetrain actuation system capable of cam profile switching down to engine temperatures well below the given minimum Euro 6 test temperature. This consists of a set of Switching Roller Finger Follower (SRFF) being controlled by a single electric actuator via an actuation shaft. The Eaton Electro Mechanical Actuation System (EMAS) is a highly efficient-low energy consuming architecture, easily adaptable to any engine layout, therefore having minimum integration costs. The introduction of a complex technology as cylinder deactivation requires a comprehensive optimization of the operating strategy, especially in conjunction with other engine systems such as boosting and EGR-systems. A virtual development and assessment of these new variabilities is possible with FEV's mean value-based powertrain simulation process. Based on a typical LCV with a 2.31-Diesel engine, the operation strategy of cylinder deactivation in combination with a highly flexible airpath was investigated and optimized. Classical cylinder deactivation is limited to a relatively small operation window due to NVH and engine out emission restrictions. Dynamic Skip Fire (DSF), which manages cylinder deactivation on an event-by-event basis, allows extending the operating window with deactivated cylinders considerably and thereby maximizes the improvement of fuel economy and emissions. For full exploitation of the overall potential of VVT/CDA technology, a further increased valvetrain flexibility is required, as individual cylinders need to be activated and deactivated on a cycle-by-cycle basis with fully flexible activation patterns. To meet this requirement EATON is developing e-latch, a further enhanced valvetrain system, having an electro-magnetic actuator on board of each SRFF, enabling individual valve control, extremely low energy consumption, very low and consistent response time: a perfect match for CDA. After comprehensive optimization to exploit the benefit of CDA attractive CO_2 benefits combined with improved thermal management of the exhaust aftertreatment system to minimize pollutant emissions can be realized, exceeding the benefits of conventional cylinder deactivation. These promising results highlight, that advanced valvetrain systems in combination with CDA can comprehensively improve the attributes of Diesel based powertrain and thereby make them fit for the future applications. The study underlines the cost-effective achievement of fuel consumption savings by an upgrade of the internal combustion engine. In combination with the integration of steel pistons up to 10 g/km CO_2 reduction in the official certification cycle is possible, while meeting the anticipated Post-EU6 emission standards and substantially lowering the risks of oil dilution in real-world driving conditions. A cost advantage of up to 5% versus a 48V equipped engine variant describes a promising option on the base of a modular engine architecture for LCV applications with predominantly long-distance operational profile.
机译：较低的燃料消耗和减少排放是开发光商用车辆新动力的主要驱动因素。因此，汽缸停用等技术降低了燃料消耗，改善了废气后处理系统的热管理，具有高度吸引力。为了允许在发动机启动后尽快使用气缸停用，伊顿开发了一种创新的机电可变阀门致动系统，能够凸轮轮廓切换到发动机温度远低于给定的最小欧元6次测试温度。这包括一组开关滚子手指跟随器（SRFF）由单个电动致动器通过致动轴控制。伊顿电器机械驱动系统（EMAS）是一种高效的能耗架构，容易适应任何发动机布局，因此具有最小的集成成本。作为气缸停用的复杂技术的引入需要全面优化操作策略，特别是与其他发动机系统（例如升压和EGR系统）结合使用。对于基于FEV的基于价值的动力传动系统的仿真过程，可以实现这些新变色的虚拟开发和评估。基于具有2.31柴油发动机的典型LCV，研究了气缸失活的操作策略与高度灵活的航空航空器进行了优化。由于NVH和发动机输出限制，古典汽缸停用仅限于相对较小的操作窗口。动态跳过火（DSF）在逐个事件的基础上管理气缸停用，允许将工作窗伸，随着停用的汽缸延伸，从而最大化燃料经济性和排放的改善。为了充分利用VVT / CDA技术的总体潜力，需要进一步提高的阀门灵活性，因为需要在逐个循环基础上激活并停用单个汽缸以完全柔性的激活模式。为了满足这一要求，伊顿开发了E-Latch，进一步增强的阀门系统，在每个SRFF的船上具有电磁执行器，使单独的阀门控制，极低的能量消耗，非常低，响应的响应时间非常低，响应时间非常低CDA。经过全面的优化，利用CDA有吸引力的CO_2益处结合改进的排气后处理系统，以最大限度地实现污染物排放，超出传统气缸失活的益处。这些有前途的结果突出显示，高级Valvetrain系统与CDA组合可以全面改善基于柴油的动力总成的属性，从而使它们适合未来的应用。该研究强调了内燃机升级的成本效益节约的燃料消耗。与钢活塞的整合相结合，可以在官方认证周期中减少10克/公里的CO_2，同时满足预期的欧盟局后期排放标准，并大大降低了现实世界驾驶条件中的石油稀释风险。高达5％的成本优势与48V配备的发动机变体相比，描述了用于LCV应用的模块化发动机架构基础的有希望的选择，其具有主要的长距离操作简档。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号