汽油直喷发动机排放研究与优化

Research and Optimization of Gasoline Direct Injection Engine Emission

随着排放法规的不断加严,对于传统动力总成而言,目前主流应对方案主要是升级发动机或者升级后处理装置。无论是升级发动机还是升级后处理装置,整车成本都会大大增加。相对于发动机本体的升级投入,后处理装置的投入相对较少一些。对于汽油直喷发动机而言,在不改变催化器配方和不增加颗粒捕集器的前提下,通过整车标定的手段达成法规要求难度巨大。本文通过优化整车标定数据的方式,最终实现颗粒物排放和气态排放物均满足国VI b排放要求,且能够满足现行RDE的要求。本文详细阐述秒采数据分析的两种方法以及优化喷油模式切换、减速断油及断油清氧等控制参数的过程及排放结果对比。

With the continuous tightening of emission regulations,for the traditional powertrain,the current mainstream solution is mainly to upgrade the engine or upgrade the after-treatment device.Whether it is upgrading the engine or upgrading the post-processing device,the vehicle cost will increase greatly.Compared with the upgrading investment of engine body,the investment of after-treatment device is relatively less.For gasoline direct injection engine,it is very difficult to achieve the regulation requirements by means of vehicle calibration without changing the form of catalyst and adding particulate trap.In this paper,by optimizing the vehicle calibration data,the final realization of particulate emissions and gaseous emissions meet the emission requirements of GB18352.6-2016,and can meet the requirements of the current RDE.In this paper,two methods of second data analysis are described in detail,and the process of optimizing the control parameters such as fuel injection mode switching,fuel cut-off during deceleration,and fuel cut-off and oxygen scavenging are compared with the emission results.