催化器动力总成台架老化与转毂老化对比研究

Comparative Research of the Catalyst Aging between Powertrain Bench and Vehicle Roller

为满足20万公里排放耐久性试验要求,需要制作等效老化程度的排气系统用于发动机标定数据的匹配开发。鉴于实车老化周期长、成本高,寻找合适的替代方案成为共识。本文基于某国六b项目,对比了动力总成台架老化方案与整车转毂老化方案的过程及结果,并对两种方案的差异原因进行了分析与研究,得出结论:动力总成台架老化方案的催化器老化程度接近于整车转毂老化催化器,具有实用价值;两种方案结果存在差距的原因为:排气系统散热环境的不同及不同控制台对行驶阻力参数设定、油门开度大小控制有差异。优化这些差异点,缩小差距是可期的。

In order to meet the 200,000-kilometer emission durability test requirements,it is necessary to make equivalent aging degree exhaust system to do the development of the engine application data.Because of the long time and high cost of real vehicle aging,it is necessary to find a suitable alternative.This paper compares the process and results of the powertrain bench aging scheme and the vehicle roller aging scheme based on an actual C6b project,analyzes and studies the reasons for the difference between these two schemes,and draws the conclusion:The aging level of the powertrain bench catalyst is close to that of the vehicle roller,this proves the practicability of powertrain bench aging scheme;the reasons for the difference between these two results can be concluded:the difference in the heat dissipation environment of the exhaust system and the driving resistance parameters setting of different control consoles,and in acceleration pedal control.Targeted optimization of these differences is expected to narrow the gap.