摘要
为了提高混合动力各系统的控制效率和响应性,针对P2结构混合动力系统控制对象的特点和整车的功能需求,提出了P2结构混合动力控制系统的构架和所有有效的工作模式,并从整车运行工况和模式转换效率的角度总结了所有有效的工作模式转换真值矩阵。为了满足各节点单元的协同控制要求,提出了P2混合动力控制系统的协同控制构架,约束了各控制单元的主要功能和接口定义,并对多个控制单元之间的复合控制过程进行描述。分析了2种不同动力源在液压控制的混合动力离合器的耦合过程以及混合动力离合器与换挡离合器控制过程重叠时所带来的动力迟滞,对离合器的压力控制和发动机的启动过程时序进行了优化。在不同的控制阶段定义了关键的控制目标,建立发动机扭矩、电机扭矩、混合动力离合器控制压力三者之间的关联。结果表明:发动机、电机、变速器之间通过HCU的协同控制方法能够高效地完成混动工作模式之间的转换。整车试验验证了各系统的系统控制效果,整个模式转换过程的时间为1.5s,换挡品质和动力响应性满足驾驶需求。
To improve the control efficiency and responsiveness of hybrid systems,a P2 control structure and effective hybrid mode are proposed based on the characteristics of the P2 hybrid control system＇s complex control object and the vehicle function requirement.The entire mode conversion truth matrix is proposed based on the vehicle＇s driving cycle and mode conversion efficiency.To meet the coordinated control requirements,a P2 hybrid coordinated control structure is presented,where the main functions and interface definitions of each control unit were constrained.With consideration given to the response delay of the two different power sources in the coupling process by the hydraulic hybrid clutch and control overlap between the hybrid clutch and shift clutch,the clutch control and engine start control sequences were optimized.The relationship between the engine torque,motor torque,and hybrid clutch control pressure,was established by defining the key control objective in different control stages.Theresults show that the mode conversion can be realized efficiently by HCU according to coordinate among engine,motor,and transmission.Each system control result is verified by vehicle test.The whole mode conversion time is 1.5 s,and the gear shift quality and dynamic responsiveness also meet the driving requirements.
作者
郭伟
徐向阳
刘献栋
王书翰
董鹏
GUO Wei;XU Xiang-yang;LIU Xian-dong;WANG Shu-han;DONG Peng(School of Transportation Science and Engineering, Beihang University, Beijing 100191, China;Beijing Key Laboratory for High-efficient Power Transmission and System Control of New Energy Resource Vehicle, Beihang University, Beijing 100191, China)
出处
《中国公路学报》
EI
CAS
CSCD
北大核心
2018年第6期308-316,共9页
China Journal of Highway and Transport
基金
国家自然科学基金项目(51705012)
关键词
汽车工程
P2结构混合动力系统
模式转换
协同控制
离合器
automotive engineering
P2 structural hybrid power system
mode conversion
coor-dinate control
clutch
