• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>IFAC PapersOnLine >Cylinder Charge Estimation in Diesel Engines with Dual Independent Variable Valve Timing
【24h】

Cylinder Charge Estimation in Diesel Engines with Dual Independent Variable Valve Timing

机译：双独立可变气门正时的柴油发动机气缸充气估计

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

With stricter emission legislations and demands on low fuel consumption, new engine technologies are continuously investigated. At the same time the accuracy in the over all engine control and diagnosis and hence also the required estimation accuracy is tightened. Central for the internal combustion control is the trapped cylinder charge and composition. Traditionally cylinder charge is estimated using cycle averaged manifold pressures and engine speed in e.g. two dimensional look-up tables. With the introduction of variable valve timing, two additional degrees of freedom are introduced. To incorporate support for these new dimensions in a traditional look-up table estimation approach would be rather expensive in terms of model calibration and collection of empirical data. This is especially true if the cam phasers are given large enough authority to offer the powerful thermal management capabilities required to fulfill future emission legislations.Two semi-physical models for pumped mass flow through the engine are developed and evaluated on experimental data. Both utilize crank angle resolved manifold pressures and cylinder volumes at discrete valve events, e.g. intake valve closing. The data covers a large operating region in engine speed/load and large independent variations in both intake and exhaust valve timing, including valve overlap and symmetric/asymmetric underlap.
机译：随着更严格的排放法规和对低油耗的要求，不断研究新的发动机技术。同时，在整个发动机控制和诊断中的精度以及因此所需的估计精度被加强。内燃控制的中心是被困的汽缸充气和成分。传统上，汽缸充气是使用循环平均歧管压力和发动机转速估算的，例如二维查询表。随着可变气门正时的引入，引入了另外两个自由度。在模型校准和经验数据收集方面，将对这些新维度的支持合并到传统的查找表估计方法中将是相当昂贵的。如果赋予凸轮相位器足够大的权限以提供满足未来排放法规所需的强大热管理功能，则尤其如此。开发了两个半物理模型，用于通过发动机的泵送质量流量并根据实验数据进行评估。两者都利用离散的阀事件（例如，气门行程）时的曲轴角分辨歧管压力和气缸容积。进气门关闭。数据涵盖了发动机转速/负载的大工作区域以及进气门和排气门正时的独立变化，包括气门重叠和对称/不对称重叠。

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