柴油发动机废气再循环控制策略优化研究  

Optimization of diesel engine exhaust gas recirculation control strategy

作　　者：王禹 潘明章 桑海浪[2] WANG Yu;PAN Mingzhang;SANG Hailang(College of Mechanical Engineering,Guangxi University,Nanning 530004,Guangxi,China;Engineering R&D Institute of Guangxi Yuchai Machinery Co.,Ltd.,Nanning 530007,Guangxi,China)

机构地区：[1]广西大学机械工程学院,广西南宁530004 [2]广西玉柴机器股份有限公司,广西南宁530007

出　　处：《中国工程机械学报》2024年第2期196-201,共6页Chinese Journal of Construction Machinery

基　　金：广西重点研发计划资助项目(桂科AB21220059)。

摘　　要：针对柴油发动机在瞬态工况下废气再循环(EGR)控制响应慢和稳定性差问题,在对进气量控制的基础上,提出一种基于最小二乘向量机(LSSVM)的EGR目标开度预测模型。通过改进的平衡优化器算法(EO)来调整LSSVM的正则化参数和带宽,提高了模型预测性能,并分别建立了基于PLEO-LSSVM的EGR目标开度控制模型和基于PLEO-LSSVM的EGR双闭环控制模型。为验证提出的模型在瞬态工况下的性能,通过Simulink对提出的模型在定转速变扭矩和定扭矩变转速2种瞬态工况下进行模拟仿真与实验分析。仿真结果表明:提出的EGR目标开度控制模型和双闭环控制模型在瞬态工况下响应速度和稳定性上有更好的表现。其中,在定转速变扭矩和定扭矩变转速工况下,与传统的组合控制相比,提出的EGR目标开度控制模型响应速度分别快0.85%和3.64%,振幅分别小34.9%和12.1%。与现有的EGR双闭环控制相比,PLEO-LSSVM双闭环控制在定转速变扭矩工况下1.6~2.3 s时间内,响应速度快5.26%,振幅小31.7%,在4.5~5.5 s时间内,响应速度快5.5%,振幅小40.81%。在定扭矩变转速工况下6.7~7.3 s时间内,PLEO-LSSVM双闭环控制响应速度快2.17%,振幅小57.9%,在11.85~12.2 s时间内,响应速度快7.14%,振幅小60.9%。Aim to the current issue of slow response and poor stability for exhaust gas recirculation(EGR)control in diesel engine under transient conditions,a prediction model of EGR valve target opening based on least square vector machine was proposed based on least square vector machine(LSSVM)was proposed on the basis of intake gas control.The regularization parameters and bandwidth of the model are adjusted by the improved equilibrium optimizer(PLEO),and the model prediction performance is improved.The model of EGR target opening control based on PLEO-LSSVM and EGR double closed-loop control model based on PLEO-LSSVM are established respectively.In order to verify the performance of the proposed model under transient conditions,simulation of simulink and experimental analysis were carried out on the proposed model under two transient conditions:constant speed variable torque and constant torque variable speed.The simulation results show that the proposed EGR valve target opening control model and double closed-loop control model have better performance in response speed and stability under transient conditions.Compared with the traditional combined control,the response speed of the proposed EGR valve target opening control model is 0.85%and 3.64%faster and the amplitude is 34.9%and 12.1%smaller,respectively,under the conditions of constant speed varying torque and constant torque varying speed.Compared with the traditional EGR double closed-loop control,the PLEO-LSSVM double closed-loop control has a faster response speed of 5.26%and a smaller amplitude of 31.7%in 1.6-2.3 s under the condition of constant speed and variable torque,and a faster response speed of 5.5%and a smaller amplitude of 40.81%in 4.5-5.5 s.The PLEO-LSSVM double closed-loop control has a faster response speed of 2.17%and a smaller amplitude of 57.9%in 6.7-7.3 s time,and a faster response speed of 7.14%and a smaller amplitude of 60.9%in 11.85-12.2 s time under the condition of constant torque and variable speed.

关 键 词：柴油发动机 NO_x 废气再循环 最小二乘向量机 预测 

分 类 号：TK[动力工程及工程热物理]