Demonstration of Air-Power-Assist Engine Technology for Clean Combustion and Direct Energy Recovery in Heavy Duty Application
Demonstration of Air-Power-Assist Engine Technology for Clean Combustion and Direct Energy Recovery in Heavy Duty Application
复制标题
重型应用中清洁燃烧和直接能量回收的空气助力发动机技术演示
DOI：
10.2172/1001339
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发表时间：
2008
影响因子：
1
通讯作者：
C. Tai
中科院分区：
文献类型：
--
作者：
Hyungsuk Kang;C. Tai
该项目的第一阶段包括四个月的应用研究，从2005年9月1日开始，到2005年12月31日完成。在此期间，项目团队严重依赖高度详细的数值建模技术来评估APA技术的可行性。具体来说，(i) 构建了 GT-Power{sup TM} 发动机仿真模型来预测各种工况下的发动机效率。效率是根据第二定律热力学可用性定义的。 (ii) 将发动机仿真生成的发动机效率图输入到在 Matlab/Simulink 环境中构建的简化车辆模型中，以预测垃圾车在简单收集循环中的燃油消耗。 (iii) 支持改造现有 Sturman Industries 液压阀驱动 (HVA) 系统概念的设计和分析工作，并进行运行具有空气动力辅助功能的 HVA 系统所需的修改。 Matlab/Simulink 模型用于计算 HVA 系统的动态响应。计算机辅助设计 (CAD) 在 Solidworks 中完成，用于机械设计和水力布局。第一阶段结束时，预计燃油经济性将提高 11%。在第二阶段，发动机模拟小组完成了发动机测绘工作。空气处理团队在确定供应商和进行 3D 建模设计方面取得了实质性进展。 Sturman Industries完成了HVA系统的设计修改，并获得了沃尔沃动力总成的审核和认可。在第二阶段，通过使用空气处理集团的 APA 发动机技术降低 EGR 冷却器出口温度，新的 EGR 冷却器设计显示出提高 15% 燃油经济性的可能性。此外，采用 APA 技术的车辆模拟估计在各种驾驶循环中燃油经济性可提高 4 -21%。在第三阶段，发动机实验装置在马里兰州黑格斯敦的 VPTNA 启动。空气处理系统和HVA系统交付给VPTNA，并于2007年6月完成APA发动机的组装。于2007年10月对APA发动机进行了功能测试，并完成了AC和AM模式测试。测试完成后，进行数据分析和后处理。特别是，这些模型有助于确定实验 HVA 系统的一些关键问题。根据 AC 和 AM 模式下可用的发动机测试结果，预计燃油经济性比 NY 复合循环提高 14.7%。这接近但略低于 ADVISOR 模拟最初估计的 18%。 APA项目组通过仿真和实验测试展示了APA技术的概念。然而，要满足APA技术最初的期望，仍然存在技术挑战。这一概念的实现技术，即能够处理排气歧管高背压的完全灵活的气门驱动系统，被认为是实现 APA 概念的主要技术挑战之一。
The first phase of the project consists of four months of applied research, starting from September 1, 2005 and was completed by December 31, 2005. During this time, the project team heavily relied on highly detailed numerical modeling techniques to evaluate the feasibility of the APA technology. Specifically, (i) A GT-Power{sup TM}engine simulation model was constructed to predict engine efficiency at various operating conditions. Efficiency was defined based on the second-law thermodynamic availability. (ii) The engine efficiency map generated by the engine simulation was then fed into a simplified vehicle model, which was constructed in the Matlab/Simulink environment, to predict fuel consumption of a refuse truck on a simple collection cycle. (iii) Design and analysis work supporting the concept of retrofitting an existing Sturman Industries Hydraulic Valve Actuation (HVA) system with the modifications that are required to run the HVA system with Air Power Assist functionality. A Matlab/Simulink model was used to calculate the dynamic response of the HVA system. Computer aided design (CAD) was done in Solidworks for mechanical design and hydraulic layout. At the end of Phase I, 11% fuel economy improvement was predicted. During Phase II, the engine simulation group completed the engine mapping work. The air handling group made substantial progress in identifying suppliers and conducting 3D modelling design. Sturman Industries completed design modification of the HVA system, which was reviewed and accepted by Volvo Powertrain. In Phase II, the possibility of 15% fuel economy improvement was shown with new EGR cooler design by reducing EGR cooler outlet temperature with APA engine technology from Air Handling Group. In addition, Vehicle Simulation with APA technology estimated 4 -21% fuel economy improvement over a wide range of driving cycles. During Phase III, the engine experimental setup was initiated at VPTNA, Hagerstown, MD. Air Handling system and HVA system were delivered to VPTNA and then assembly of APA engine was completed by June 2007. Functional testing of APA engine was performed and AC and AM modes testing were completed by October 2007. After completing testing, data analysis and post processing were performed. Especially, the models were instrumental in identifying some of the key issues with the experimental HVA system. Based upon the available engine test results during AC and AM modes, the projected fuel economy improvement over the NY composite cycle is 14.7%. This is close to but slightly lower than the originally estimated 18% from ADVISOR simulation. The APA project group demonstrated the concept of APA technology by using simulation and experimental testing. However, there are still exists of technical challenges to meet the original expectation of APA technology. The enabling technology of this concept, i.e. a fully flexible valve actuation system that can handle high back pressure from the exhaust manifold is identified as one of the major technical challenges for realizing the APA concept.