• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文会议>Advances in automotive control >MODEL-BASED CONTROL OF AN SCR-CATALYST FOR THE NOx-REDUCTION OF DIESEL-ENGINES
【24h】

MODEL-BASED CONTROL OF AN SCR-CATALYST FOR THE NOx-REDUCTION OF DIESEL-ENGINES

机译：柴油发动机NOx还原的SCR催化剂基于模型的控制

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 portion of the diesel vehicles in NOx emissions is continously growing. Engine-operated measures to reduce nitrogen oxid lead to an increase in particle emissions and/or an increase in fuel consumption. An exhaust-gas treatment offers a way-out in this conflict of antagonistic objectives.rnA control concept for a technique to reduce the amount of NOx catalytically by adding urea is presented. Inside the catalyst ammonia is produced, which combines with NOx and turns into nitrogen and water. A critical point is a surplus in ammonia as toxic ammonia is yielded into the atmosphere. To avoid this risk the control device has to calculate permanently the amount of ammonia which is accumulated and converted. It also has to regulate the dosing proportion accordingly.rnIn order to define the conversion of components inside the catalyst in transient operation a temperature model as well as a reaction-kinetic model had been developed. The temperature model allows the calculation of the course of temperature inside the catalyst. This on the other hand determines the diffusion and reaction inside the catalyst (reaction-kinetic model).rnThe course of temperature as well as the course of NOx-and NH3 inside the catalyst can be calculated with sufficient exactness. Thus the urea dosing proportion can be controlled in such a way that no ammonia slip is possible behind the catalyst.
机译：柴油车中NOx排放量的比例不断增加。由发动机操作的减少氮氧化物的措施导致微粒排放增加和/或燃料消耗增加。废气处理为这种对抗性目标冲突提供了一种出路。提出了一种通过添加尿素催化减少NOx量的技术的控制概念。在催化剂内部产生氨，该氨与NOx结合并转化为氮气和水。一个关键点是氨的过量，因为有毒的氨会散发到大气中。为了避免这种风险，控制设备必须永久性地计算出积累和转化的氨气量。为了确定催化剂在瞬态运行中组分的转化率，开发了温度模型和反应动力学模型。温度模型允许计算催化剂内部的温度过程。另一方面，这决定了催化剂内部的扩散和反应（反应动力学模型）。rn催化剂内部的温度变化过程以及NOx和NH3的变化过程可以足够精确地计算出来。因此，可以以这样的方式控制尿素的添加比例，使得在催化剂后不可能有氨泄漏。

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