基于WHTC循环的车用柴油机瞬态性能与排放控制研究-动力工程专业论文.docxVIP

上海交通大学工程硕士学位论文摘要 上海交通大学工程硕士学位论文 摘要 万方数据 万方数据 基于 WHTC 循环的车用柴油机瞬态性能与排放控制研究 摘 要 瞬态工况是车用柴油机的常用工况，传统的基于稳态工况的台架开 发并不能很好的适应其实际运行特性。随着排放的升级和技术的进步， 瞬态工况下的性能指标也越来越受关注，加强对瞬态性能的研究对车用 柴油机的开发具有重大意义。 本文基于 WHTC 循环，围绕车用柴油机的瞬态性能进行了如下几个 方面的研究： 1） 通过研究车辆的运行特点，从动力性、经济性、驾驶平顺性 和排放性能等几个方面探索了车用柴油机瞬态性能的评价方法。 2） 通过对 WHTC 循环与 ETC 循环的对比和城市车辆运行工况的分 析，探讨了 WHTC 循环对评价城市车用柴油机排放的适用性。 3） 以一款 8.3L 增压中冷电控柴油机为研究对象，试验研究了燃 油喷射控制参数对 WHTC 循环排放和经济性的影响。同时对加速过程和 减速过程中柴油机和后处理系统参数的变化情况进行了研究，分析了动 态系数对 NOx 排放和氨泄漏的影响。 本文通过以上对柴油机和后处理系统参数瞬态工况标定策略的研 究，使得目标柴油机达到了基于 WHTC 循环的国四阶段排放标准。 关键词：瞬态性能，评价方法，WHTC 循环，燃油控制参数，动态系数 I 上海交通大学工程硕士学位论文AB 上海交通大学工程硕士学位论文 ABSTRACT Study on Transient Performance and Emission Control Strategy for Vehicle Diesel Engine Based on WHTC Cycle ABSTRACT As transient state is a common mode of the vehicle diesel engine, traditional bench testing strategy based on steady state do little to ensure transient performance compliance. It is important and necessary for the enterprises to do research on engine transient performance. The objective of this research is to investigate the transient performance of a vehicle diesel engine. This research is based on World Harmonious Transient Cycle. The content is as follows. A methodology is described for the evaluation of transient performance, such as dynamic performance, fuel consumption performance, ride performance, transient emission performance, etc. Comparison of WHTC and ETC show that WHTC is more applicable to evaluate the emission and fuel economy performance of a city vehicle By taking an 8.3 liter- diesel engine as the research object, this paper has focused on the influence factors of WHTC emission and fuel economy performance. The effect of fuel injection control parameters on the emission and fuel economy had been studied. Based on the acceleration process and deceleration process, the variation of diesel engine and SCR after-treatment system parameters has been analyzed. The influence of the dynamic factor has been studied. Based on the above researc