During the shifting process of hybrid transmission,the motor plays an important role due to its fast response and accurate torque control.However,it also leads to an excessive reliance on the motor,while neglecting th...During the shifting process of hybrid transmission,the motor plays an important role due to its fast response and accurate torque control.However,it also leads to an excessive reliance on the motor,while neglecting the collaborative control of the motor and clutch.Therefore,there is still room for further improvement in the shifting quality of the hybrid system.In addition,the changing motor torque can easily cause a certain shifting impact at the moment of the clutch state transition,especially for the transition from sliding state to engaged state.In the meanwhile,due to the presence of multiple power sources,the influence of acceleration on the shifting process cannot be ignored.For these problems,this paper proposes a power-on upshifting control strategy for a two-speed series-parallel hybrid transmission,and the root cause of the shifting impact when the clutch slip is eliminated is analyzed.On this basis,a motor torque control method is proposed that is easily to be implemented in engineering,that is,when the target slip is reduced to the threshold Δω_(1),set the motor proportionalintegral(PI)controller output to zero to ensure that the motor output torque can be changed to zero when the clutch slip is eliminated so that the shifting impact here can be suppressed.Then the factors that affect the value setting of Δω_(1) are analyzed based on the dynamics model and verified by simulation and hardware-in-loop(HIL)test based on the control variable method.In addition,the influence of acceleration on the shifting process is analyzed,and corresponding control strategies are proposed to improve the shifting quality.Finally,the Worldwide Harmonized Light Vehicles Test Cycle(WLTC)test is conducted on the vehicle model to compare the shifting control effects under different working conditions,which can verify the proposed effectiveness of the control strategy.展开更多
为解决纯电动汽车动力性与经济性的矛盾,针对某新能源汽车企业开发的双电机驱动的小型纯电动车,设计一款基于双行星排集成式齿轮传动机构的双速自动变速器,分析低速挡与高速挡的动力传递特性,提出电液比例压力控制的智能换挡策略。研究...为解决纯电动汽车动力性与经济性的矛盾,针对某新能源汽车企业开发的双电机驱动的小型纯电动车,设计一款基于双行星排集成式齿轮传动机构的双速自动变速器,分析低速挡与高速挡的动力传递特性,提出电液比例压力控制的智能换挡策略。研究结果表明,相比单级固定齿比减速器,该变速器使0~50 km·h^(-1)加速时间减少了24.2%,新欧洲驾驶循环(New European Driving Cycle,NEDC)工况百公里电耗降低了13.1%,爬坡能力提高了44.9%,同时确保了换挡平顺性。展开更多
基金financially supported by National Natural Science Foundation of China(Grant Number:52172352,52322216)Beijing Natural Science Foundation(Grant Number:L233039)+4 种基金Ningbo Natural Science Foundation(Grant No.2023J052)“Pioneer”and“Leading Goose”R&D Program of Zhejiang(Grant No.2023C01133)Key R&D Program of Ningbo(Grant No.2023Z014)the support of Beijing Key Laboratory for High-efficient Power Transmission and System Control of New Energy Resource Vehiclethe support of the Fundamental Research Funds for the Central Universities.
文摘During the shifting process of hybrid transmission,the motor plays an important role due to its fast response and accurate torque control.However,it also leads to an excessive reliance on the motor,while neglecting the collaborative control of the motor and clutch.Therefore,there is still room for further improvement in the shifting quality of the hybrid system.In addition,the changing motor torque can easily cause a certain shifting impact at the moment of the clutch state transition,especially for the transition from sliding state to engaged state.In the meanwhile,due to the presence of multiple power sources,the influence of acceleration on the shifting process cannot be ignored.For these problems,this paper proposes a power-on upshifting control strategy for a two-speed series-parallel hybrid transmission,and the root cause of the shifting impact when the clutch slip is eliminated is analyzed.On this basis,a motor torque control method is proposed that is easily to be implemented in engineering,that is,when the target slip is reduced to the threshold Δω_(1),set the motor proportionalintegral(PI)controller output to zero to ensure that the motor output torque can be changed to zero when the clutch slip is eliminated so that the shifting impact here can be suppressed.Then the factors that affect the value setting of Δω_(1) are analyzed based on the dynamics model and verified by simulation and hardware-in-loop(HIL)test based on the control variable method.In addition,the influence of acceleration on the shifting process is analyzed,and corresponding control strategies are proposed to improve the shifting quality.Finally,the Worldwide Harmonized Light Vehicles Test Cycle(WLTC)test is conducted on the vehicle model to compare the shifting control effects under different working conditions,which can verify the proposed effectiveness of the control strategy.
文摘为解决纯电动汽车动力性与经济性的矛盾,针对某新能源汽车企业开发的双电机驱动的小型纯电动车,设计一款基于双行星排集成式齿轮传动机构的双速自动变速器,分析低速挡与高速挡的动力传递特性,提出电液比例压力控制的智能换挡策略。研究结果表明,相比单级固定齿比减速器,该变速器使0~50 km·h^(-1)加速时间减少了24.2%,新欧洲驾驶循环(New European Driving Cycle,NEDC)工况百公里电耗降低了13.1%,爬坡能力提高了44.9%,同时确保了换挡平顺性。
