• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>The automobile in the second decade: sharing all energy solutions >HCCI-COMBUSTION IN THE Z ENGINE
【24h】

HCCI-COMBUSTION IN THE Z ENGINE

机译：Z引擎中的HCCI燃烧

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

The most common car engine is a 4-cylinder 4-stroke engine. The car manufacturers have arngreat pressure to lower the cost of the cars and this deal also with the engines. The challengesrnare the coming new emission norms (for example EURO-6) and also the custom acceptance,rnbecause of the fact, that the car drives are used to the 4-cylinder engine and they want to havernthe same driving fun also from the new engines. A 2-cylinder 2-stroke engine has the samernpower output and toque as a 4-cylinder 4-stroke engine and thus it offers the same drivingrnfun. Equal balancing is easy to make without some big additional costs, if the gas exchange ofrnthe engine is made by using poppet valves and camshafts. As there are only about 50% of thernmoving parts in the engine, its acceleration is even better than by a 4-cylinder engine.rnOne of the latest developments in 2-stoke engines is the Z engine, having the compressionrnpartially transferred outside of the working cylinders. This offers new thermo dynamicalrnpossibilities to adjust the working cycle and the combustion. As there are methods to controlrnthe temperature at TDC, a HCCI-combustion is possible in the Z engine at all loads. Thisrnlowers significant the cost of the engine, as no urea injection, or NOx catalyst is needed tornpass the coming EU-6 emission norm. The cost of the Z engine is lower also because of thernfact that it has only 2 working cylinders instead of 4. These unique features lower the costs ofrnthe Z engine about 40% (56) compared to an equal 4-cylinder 4-stroke engine.rnIn 1999, Aumet Oy (51) began to research this 2-stroke car diesel engine, called the Z engine,rnin co-operation with the Internal Combustion Engine Laboratory at the Helsinki University ofrnTechnology (HUT) and the Energy Technology Department at the Lappeenranta University ofrnTechnology (LUT). So far, four master’s theses, two SAE Papers (49,50) and four FisitarnPapers have been completed on the subject. Modern simulation tools, such as Star CD, GTPower,rnDiesel RK and Chemkin have been used. Aumet’s research project was a part of thernFinnish Engine Technology Programme, ProMotor, and it was supported by the NationalrnTechnology Agency Finland, TEKES. The prototype engine made its first start in Decemberrn2004 and testing of the engine has been made two years in a test bench at VTT (TechnicalrnResearch Centre of Finland). The Z engine has until now got seven international patents,rnseveral are pending and Aumet Oy has got recently the Euro patent in February 2009.rnIn the HCCI combustion simulation of the Z engine, a 4-dimensional ignition delay map,rncalculated with Chemkin and integrated in Diesel RK (52), has been used. The simulationsrnand tests with the test engine show that the Z engine has a very good efficiency, especially atrnpart load. A HCCI-combustion at all loads is possible in the Z engine, with lambda about 1,5-rn2 and EGR-rate 10-40%, depending of the load. The TDC-temperature at part load is aboutrn800 K and at full load (bmep 30 bar) about 700 K. The HCCI-ignition, triggered with a sparkrnplug occurs at full load between 0-20° ATDC and this limits the pressure and maximalrntemperature. NOx values are very low as the maximal temperature at full load is about 1900rnK, because of the low starting temperature of the combustion, intern EGR and the expansionrnduring the combustion. Intern EGR and active radicals stabilize the combustion (10-15).
机译：最普通的汽车发动机是四缸四冲程发动机。汽车制造商具有降低汽车成本的巨大压力，这也涉及发动机。面临的挑战是即将到来的新排放标准（例如EURO-6），以及自定义接受，因为事实是汽车驱动器已习惯于4缸发动机，而他们也希望从新发动机中获得相同的驾驶乐趣。 2缸2冲程发动机具有与4缸4冲程发动机相同的功率输出和扭矩，因此提供了相同的驱动乐趣。如果使用提升阀和凸轮轴进行发动机的气体交换，则可以很容易地实现均等的平衡而无需付出大量的额外费用。由于发动机中只有约50％的运动部件，因此其加速度甚至比四缸发动机还要好.2冲程发动机的最新发展之一是Z发动机，其压缩力部分地转移到了工作之外气瓶。这为调节工作循环和燃烧提供了新的热力学可能性。由于存在控制TDC处温度的方法，因此Z发动机在所有负载下都可能发生HCCI燃烧。这大大降低了发动机成本，因为不需要尿素喷射或NOx催化剂来突破即将到来的EU-6排放标准。 Z发动机的成本也较低，这是因为它实际上只有2个工作气缸而不是4个工作气缸。与同等的4缸4冲程发动机相比，这些独特的功能将Z发动机的成本降低了约40％（56）。 rn 1999年，Aumet Oy（51）与赫尔辛基科技大学（HUT）的内燃机实验室以及拉彭兰塔（Lappeenranta）能源技术系合作研究了这种称为Z冲程的2冲程汽车柴油发动机。电子技术大学（LUT）。到目前为止，已经完成了四篇硕士论文，两篇SAE论文（49,50）和四篇FisitarnPapers。使用了现代仿真工具，例如Star CD，GTPower，rnDiesel RK和Chemkin。 Aumet的研究项目是芬兰发动机技术计划ProMotor的一部分，并得到了芬兰国家技术局TEKES的支持。该原型发动机于2004年12月首次启动，在VTT（芬兰技术研究中心）的测试台上进行了两年的发动机测试。 Z引擎迄今已获得七项国际专利，正在申请中，还有数项正在申请中，Aumet Oy最近于2009年2月获得了欧洲专利。rn在Z引擎的HCCI燃烧模拟中，使用Chemkin计算并集成了一个四维点火延迟图。已使用Diesel RK（52）中的Diesel RK。用测试引擎进行的仿真和测试表明Z引擎具有非常好的效率，尤其是在部分负载下。 Z引擎在所有负载下均可能发生HCCI燃烧，λ约为1,5-rn2，EGR率取决于负载，为10-40％。在部分负载下的TDC温度约为800 K，在完全负载（bmep 30 bar）下约为700K。由火花塞触发的HCCI点火发生在0-20°ATDC的完全负载下，这限制了压力和最高温度。由于燃烧的起始温度低，内部EGR和燃烧期间的膨胀，NOx值非常低，因为满载时的最高温度约为1900rnK。实习生EGR和活性基团可稳定燃烧（10-15）。

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