Influence of EGR Transient Correction Strategy on Emission Performance of Heavy Duty Diesel Engine

doi:10.7652/xjtuxb201803006

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Influence of EGR Transient Correction Strategy on Emission Performance of Heavy Duty Diesel Engine

更新时间：2025-07-09

- Influence of EGR Transient Correction Strategy on Emission Performance of Heavy Duty Diesel Engine
- Vol. 52, Issue 3, Pages: 41-46(2018)
- 作者机构：
  
  1. 吉林大学汽车仿真与控制国家重点实验室,长春,130022
  2. 博世汽车柴油系统有限公司,江苏,无锡,214000
- 作者简介：
- 基金信息：
- DOI：10.7652/xjtuxb201803006
  CLC： TK421.2
- Online First：10 March 2018，
  
  Published：2018
- 稿件说明：
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Influence of EGR Transient Correction Strategy on Emission Performance of Heavy Duty Diesel Engine[J]. 2018, 52(3): 41-46.
DOI：

Influence of EGR Transient Correction Strategy on Emission Performance of Heavy Duty Diesel Engine[J]. 2018, 52(3): 41-46. DOI： 10.7652/xjtuxb201803006.

摘要

针对重型柴油机瞬态工况(特指恒定转速、转矩瞬增工况)空气系统响应迟滞造成的排放恶化问题

设计了废气再循环(EGR)瞬态修正控制策略

从EGR阀预控制和瞬态需求空气量两方面进行EGR瞬态修正:当判定发动机处于瞬态工况时

将EGR阀预控制开度设定为0

加快EGR阀关闭速度; 依据瞬态程度修正需求空气量

使实际进气量更早满足需求空气量

实现EGR阀适时开启。试验结果表明:经过EGR瞬态修正

改善了瞬态工况排放恶化、发动机动力性响应不及时等问题; 在WHTC(world harmonized transient cycle)瞬态循环中加入EGR瞬态修正后

氮氧化物(NO

)排放降低了4.7%

碳烟排放降低了46.4%

碳氢化合物和一氧化碳排放分别降低了8.5%和30.3%

但二氧化碳排放增加了0.3%

油耗增大了0.6%。EGR瞬态修正控制策略虽然牺牲了0.6%的油耗

但是显著改善了NO

、碳烟、碳氢化合物和一氧化碳等有害气体的排放

因此可为重型柴油发动机排放性能的改善提供借鉴。

Abstract

Aiming at solving the emission deterioration of diesel engine under transient working conditions caused by delayed response of air system

an exhaust gas recirculation(EGR)transient correction strategy is developed. EGR valve pre-control and desired air mass are both corrected under the transient correction strategy. The EGR valve pre-control value is set to zero when the engine is at a transient working condition to accelerate the closing of EGR valve. Meanwhile

the desired air mass is modified according to the transient level of engine by making the EGR valve open at reasonable time. With the EGR transient correction control

engine emissions and drivability under transient working condition are improved. Test results show that reductions of 4.7% NO

46.4% soot

8.5% HC and 30.3% CO

but increase of 0.6% fuel consumption

are obtained. Considering the obvious emissions improvement

the tiny fuel consumption increase can be ignored. It can be concluded that the proposed EGR transient correction strategy is effective for diesel engine performance improvement.

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references

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