吉林大学学报(工学版) ›› 2023, Vol. 53 ›› Issue (1): 61-71.doi: 10.13229/j.cnki.jdxbgxb20210596

• 车辆工程·机械工程 • 上一篇    下一篇

基于分层控制器的SCR系统滚动时域优化控制方法

孙耀1(),胡云峰1,周杰敏2,程欢2,曲婷1(),赵靖华1,3,陈虹4   

  1. 1.吉林大学 汽车仿真与控制国家重点实验室，长春 130022
    2.东风商用车技术中心，武汉 430056
    3.吉林师范大学 计算机学院，吉林 四平 136000
    4.同济大学 电子与信息工程学院，上海 200092
  • 收稿日期:2021-06-30 出版日期:2023-01-01 发布日期:2023-07-23
  • 通讯作者: 曲婷 E-mail:syao@jlu.edu.cn;quting@jlu.edu.cn
  • 作者简介:孙耀（1988-），男，讲师，博士. 研究方向：模型预测控制，动力系统工作性能优化. E-mail：syao@jlu.edu.cn
  • 基金资助:
    国家自然科学基金项目(62103160);吉林省教育厅项目(JJKH20211098KJ);吉林省科技发展计划项目(20210508058RQ)

Moving horizon optimization control of SCR system based on hierarchical controller

Yao SUN1(),Yun-feng HU1,Jie-min ZHOU2,Huan CHENG2,Ting QU1(),Jing-hua ZHAO1,3,Hong CHEN4   

  1. 1.State Key Laboratory of Automotive Simulation and Control，Changchun 130022，China
    2.Technology Center of Dongfeng Commercial Vehicle，Wuhan 430056，China
    3.College of Computer Science and Technology，Jilin Normal University，Siping 136000，China
    4.College of Electronic and Information Engineering，Tongji University，Shanghai 200092，China
  • Received:2021-06-30 Online:2023-01-01 Published:2023-07-23
  • Contact: Ting QU E-mail:syao@jlu.edu.cn;quting@jlu.edu.cn

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摘要：

为保证选择性催化还原（SCR）系统的转化效率并减少尿素消耗量，本文基于氨覆盖率设计了一种新颖的分层控制器，上层为模型预测控制（MPC）氨覆盖率优化控制器，实时优化计算得到的氨覆盖率目标值；下层为三步法非线性跟踪控制器，结合类稳态控制、参考前馈控制、变增益反馈控制跟踪参考目标。在仿真环境与原机电子控制单元（ECU）进行对比验证，分层控制器的关键指标均有所提升，氨逃逸下降超过85%，NO x 比排放下降27.4%，尿素消耗量降低5%。结果表明，本文提出的优化方法具有较强的应用价值。

关键词: 自动控制技术, 尿素SCR系统, 分层控制器, 模型预测控制, 三步法跟踪控制器

Abstract:

To maintain NO x conversion efficiency and reduce urea consumption of urea-SCR system， this paper designed a novel hierarchical controller. The up-level controller was a MPC controller to optimize the target ammonia coverage ratio online. The low-level controller was a triple step method controller to fast track the reference using steady-like control， reference feedforward control and gain-scheduling feedback control. Compare the controller performance in MIL environment and all key indicators improved with the cascaded controller. Ammonia slip decreased over 85%， and specific NO x emission declined 27.4%， while the urea consumption also decreased by 5%. The results show that the optimized strategy proposed in this paper has strong application value.

Key words: automatic control technology, urea-SCR system, hierarchical controller, model predictive control, triple step tracking controller

中图分类号: 

  • U463.6

图1

SCR系统级联式控制架构"

图2

单核SCR降阶模型框架"

图3

SCR系统的单核CSTR模型"

表1

参数辨识结果"

待辨识参数辨识结果
K1253 480
K2979 000
K3127 900
K433 050
K592 850
E1542.4
E22 450
E35 598
E42 546.8
E510 198
θMAX50

图4

SCR模型仿真结果和实验数据对比情况"

图5

第一组数据对结果"

图6

第二组对比数据结果"

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