直喷式汽油机共轨压力的无标定建模控制  

Model-Based Non-Calibration Control of Common Rail Pressure for a Gasoline Direct Injection Engine

作　　者：董奥 陈韬[1] 陈大昕 钱振环 谢辉[1] DONG Ao;CHEN Tao;CHEN Daxin;QIAN Zhenhuan;XIE Hui(State Key Laboratory of Engines,Tianjin University,Tianjin 300072,China)

机构地区：[1]天津大学,内燃机燃烧学国家重点实验室,天津300072

出　　处：《内燃机工程》2020年第5期84-92,共9页Chinese Internal Combustion Engine Engineering

基　　金：国家重点研发计划(2016YFB0101402)。

摘　　要：为了对直喷式汽油机共轨压力实施全里程生命周期和复杂工况下的精确控制,提出了一种基于共轨系统建模的无标定控制计算法。根据共轨系统的结构参数和流量特性,建立了喷油器、高压油泵和共轨管的数学模型,并对相关参数进行了拟合和验证。为了提高离线拟合参数的鲁棒性,对模型中的未知参数设计了自学习方案,以进行实时修正和优化。通过采用精确前馈模型和自抗扰控制器,实现了共轨系统无标定控制,并提高了系统的自抗扰能力。在Simulink仿真平台进行的试验验证显示,与传统控制方法相比,本建模计算法可以将反馈输出比降低到40%以下,并使瞬时响应时间及其上冲量降低45%以上,从而免除了前馈反馈参数复杂的标定过程,并具有良好的鲁棒性和全生命周期适应能力,该方法可用于共轨系统的嵌入式控制。In order to accurately control the common rail pressure for a gasoline direct injection(GDI)engine over the total mileage life cycle and under complicated operating conditions,a model-based non-calibration control(NC-MBC)algorithm was proposed.According to the structural parameters and flow characteristics of the common rail system,the mathematical models of injectors,high-pressure fuel pumps,and common rail tubes were established,and related parameters were fitted and verified.In order to improve the robustness of offline fitting parameters in the models,a self-learning scheme for unknown parameters was designed for real-time correction and optimization.By adopting an accurate feedforward model and an active disturbance rejection controller,a non-calibration precise control of the common rail system was achieved,and the system s active disturbance rejection control capability was improved.The experimental verification conducted on the Simulink simulation platform shows that compared with traditional control method,this model-based algorithm can reduce the feedback output ratio to less than 40%coupled to the reduction of transient response time and its overshoot by more than 45%,thus eliminating a complex calibration process for the feedforward feedback parameters,and having good robustness and adaptability to the total life cycle,which can be suitable for embedded control of common rail system.

关 键 词：共轨 精确建模 模型参数自学习 自抗扰控制 无标定控制 

分 类 号：TK411[动力工程及工程热物理—动力机械及工程]