柴油机乙醇选择催化还原系统控制策略的研究

Study on Control Strategy of Ethanol Selective Catalytic Reduce System in Diesel Engine

设计了一种氮氧化物(NOx)选择催化还原(SCR)试验台,简单介绍了试验台的系统组成和功能。为车载柴油机排气SCR净化系统提出了一种先进的控制策略,该控制策略主要包括还原剂喷射控制和助燃机剂喷射控制组成。对控制策略进行了试验研究,结果表明:使用该控制策略的SCR净化系统对车用柴油机排气NOx有较好的净化效果。

An advanced control strategy of diesel emission catalytic reduction system where ethanol was used as reducer was described. The control strategy was consisted of two parts： the control of injection quantity of reducer and the control of injection quantity of ethanol. In order to cheek the control strategy, a test-bench was created, which included control system, SCR device, ethanol injection system. The experiment result showed the cleaning effect of diesel exhaust SCR after-treatment system was satisfied by using the control strategy.