基于自适应LS-SVM的柴油机废气再循环冷却控制系统设计  

Design of Diesel Engine Exhaust Recycling Cooling Control System Based on Adaptive LS-SVM

作　　者：教传艳[1,2] JIAO Chuanyan(School of Mechanical Engineering and Automation,Shenyang Institute of Technology,Fushun 113122,China;Liaoning Key Laboratory of Information Physics Fusion and Intelligent Manufacturing for CNC Machine,Fushun 113122,China)

机构地区：[1]沈阳工学院机械工程与自动化学院,辽宁抚顺113122 [2]辽宁省数控机床信息物理融合与智能制造重点实验室,辽宁抚顺113122

出　　处：《计算机测量与控制》2022年第2期124-128,144,共6页Computer Measurement &Control

摘　　要：针对当前柴油机废气再循环冷却控制系统受到时滞问题影响,导致系统开度走势与设定走势不一致、废气再循环效果差的问题,提出基于自适应LS-SVM的柴油机废气再循环冷却控制系统;以AT89C51单片机40针作为电控单元核心部件,利用位置传感器向系统发送负载信号,利用温度传感器来传输信号并反馈至D/A转换器;在D/A转换器中,反馈信号以串行或并行方式进入寄存器,并在转换后输出电流电压,控制系统阀门在排气再循环时的开启;伺服泵采用冷却系统,为系统提供液压动力源;利用自适应LS-SVM原理计算柴油机废气再循环冷却控制目标边界值,在最小二乘支持向量机基础上,利用求解线性方程组进行优化,消除了控制误差;根据控制差的大小,调整控制系统的输出值;由试验结果可知,该系统开度走势与设定开度走势一致,且与设定开度误差为1开度,说明使用该系统具有良好稳态特性,有效克服了系统中时滞问题,废气再循环效果较好。Aiming at the current diesel engine exhaust gas recirculation cooling control system affected by time lag,which causes the system opening trend to be inconsistent with the set trend and the exhaust gas recirculation effect is poor,a diesel exhaust gas recirculation cooling control system based on adaptive LS-SVM is proposed.The 40-pin AT89C51 single-chip microcomputer is used as the core component of the electronic control unit,and the position sensor is used to send load signals to the system,and the temperature sensor is used to transmit the signals and feedback to the D/A converter.In the D/A converter,the feedback signal enters the register in a serial or parallel manner,and outputs the current and voltage after the conversion,and controls the opening of the system valve during exhaust gas recirculation.The servo pump adopts a cooling system to provide a hydraulic power source for the system.The adaptive LS-SVM principle is used to calculate the target boundary value of the diesel engine exhaust gas recirculation cooling control.Based on the least square support vector machine,the linear equations are solved for optimization and the control error is eliminated.According to the size of the control difference,adjust the output value of the control system.From the test results,it can be seen that the system opening trend is consistent with the set trend,and the error of the setting opening degree is within 1 opening degree.The recycling effect is better.

关 键 词：自适应LS-SVM 柴油机 废气再循环 冷却控制开度 

分 类 号：TK421[动力工程及工程热物理—动力机械及工程]