The automatic control of clutch starting in car with a metal pushingbelt-planetary gear continuously variable transmission (CVT) is a complex problem. A suited controlstrategy is required to realize quick and smooth s...The automatic control of clutch starting in car with a metal pushingbelt-planetary gear continuously variable transmission (CVT) is a complex problem. A suited controlstrategy is required to realize quick and smooth start. A simulation state space equation isestablished on clutch staring control of a car with CVT by bond graph theory. According to the fuzzycontrol method with the expert system, a fuzzy control system of car starting process to weaken thejerk motion is introduced. The simulation results indicate that the jerk motion of clutch startingis below 10 m/s^3.展开更多
Start-up working condition is the key to the research of optimal engagementof automatic clutch for AMT. In order to guarantee an ideal dynamic performance of the clutchengagement, an optimal controller is designed by ...Start-up working condition is the key to the research of optimal engagementof automatic clutch for AMT. In order to guarantee an ideal dynamic performance of the clutchengagement, an optimal controller is designed by considering throttle angle, engine speed, gearratio, vehicle acceleration and road condition. The minimum value principle is also introduced toachieve an optimal dynamic performance of the nonlinear system compromised in friction plate wearand vehicle drive quality. The optimal trajectory of the clutch engagement can be described in theform of explicit and analytical expressions and characterized by the deterministic and accuratecontrol strategy in stead of indeterministic and soft control techniques which need thousands ofexperiments. For validation of the controller, test work is carried out for the automated clutchengagements in a commercial car with an traditional mechanical transmission, a hydraulic actuator, agroup of sensors and a portable computer system. It is shown through experiments that dynamicbehaviors of the clutch engagement operated by the optimal control are more effective and efficientthan those by fuzzy control.展开更多
The electro-hydraulic clutch control system controls the transferred torque of gear-shifting clutches in clutch-to-clutch transmissions. A nonlinear dynamic model of an electro-hydraulic clutch shift control system is...The electro-hydraulic clutch control system controls the transferred torque of gear-shifting clutches in clutch-to-clutch transmissions. A nonlinear dynamic model of an electro-hydraulic clutch shift control system is presented. The mechanical and fluid subsystems of all valves are investigated, including their interactions. Model validation of the electro-hydraulic valve system is performed by comparing the simulated and measured pressure curves. The dynamic characteristics of the electro-hydraulic clutch shift control system with different supply pressures and different fluid temperatures are simulated and evaluated. It is found that pipes which are often ignored between the electro-hydraulic valve system and the clutch piston,have strong influence on clutch piston chamber pressures. In order to satisfy the required time and reduce the fluctuation of the clutch piston chamber pressures,the orifices' diameters and valve structure are optimized.展开更多
A sliding mode control approach based on the feedback linearization is proposed for the electrically controllable clutch of AMT vehicles. The nonlinear dynamic model for the hydraulic actuator associated with clutch i...A sliding mode control approach based on the feedback linearization is proposed for the electrically controllable clutch of AMT vehicles. The nonlinear dynamic model for the hydraulic actuator associated with clutch is established. By means of the exact feedback linearization procedure of differential geometry, an equivalent, fully controllable and linear model is derived via a homomorphic transformation for the AMT clutch system.Furthermore, a sliding mode control is introduced to improve robustness. The tracking tests are performed using the sliding mode control on a Santana LX passenger car, and the experimental results prove that this nonlinear controller is of fine robustness and high degree of tracking accuracy.展开更多
Based on detail analysis of clutch engaging process control targets and adaptive demands, a control strategy which is based on speed signal, different from that of based on main clutch displacement signal, is put forw...Based on detail analysis of clutch engaging process control targets and adaptive demands, a control strategy which is based on speed signal, different from that of based on main clutch displacement signal, is put forward. It considers both jerk and slipping work which are the most commonly used quality evaluating indexes of vehicle starting phase. The adaptive control system and its reference model are discussed profoundly. Taking the adaptability to different starting gears and different road conditions as examples, some proving field test records are shown to illustrate the main clutch adaptive control strategy at starting phase. Proving field test gives acceptable results.展开更多
针对如何提高阀控离合器的位置控制精度、克服非线性等问题,该文提出了一种基于状态反馈线性化的电液伺服系统模型预测控制方案。首先建立了伺服系统状态空间模型,将非线性系统映射为新坐标空间内的线性系统模型;接着设计了一种基于马...针对如何提高阀控离合器的位置控制精度、克服非线性等问题,该文提出了一种基于状态反馈线性化的电液伺服系统模型预测控制方案。首先建立了伺服系统状态空间模型,将非线性系统映射为新坐标空间内的线性系统模型;接着设计了一种基于马尔可夫链预测模型的反馈线性化模型预测控制器(feedback linearization model predictive controller,FLMPC),通过设计损失函数求解最优输入序列,最终作用于反馈线性化系统。仿真结果证明,在相同输入情况下,反馈线性化系统与原系统的位置误差满足控制需要,可以有效减少超调量。且在保证被控对象快速稳定控制的条件下,相比非线性模型预测控制,该算法单步计算时间更短。展开更多
针对纯电动汽车两挡双离合自动变速器(two-speed dual-clutch transmission,2DCT)换挡控制模型及参数的不确定性和存在的未知干扰,提出了一种线性自抗扰(linear active disturbance rejection controller,LADRC)换挡控制策略。首先建立2...针对纯电动汽车两挡双离合自动变速器(two-speed dual-clutch transmission,2DCT)换挡控制模型及参数的不确定性和存在的未知干扰,提出了一种线性自抗扰(linear active disturbance rejection controller,LADRC)换挡控制策略。首先建立2DCT换挡过程动力学模型,并分析了换挡过程;然后考虑控制模型的不确定性及未知干扰,将LADRC控制器应用到换挡过程对期望角速度进行跟踪,并采用扩张状态观测器(extended state observer,ESO)对扰动进行实时估计,并加以补偿,最后与PID控制进行对比。仿真和实验结果表明,该控制器跟踪误差更小,鲁棒性强,能保证良好的换挡品质。展开更多
基金National Natural Science Founda-tion of China (No.59835160).
文摘The automatic control of clutch starting in car with a metal pushingbelt-planetary gear continuously variable transmission (CVT) is a complex problem. A suited controlstrategy is required to realize quick and smooth start. A simulation state space equation isestablished on clutch staring control of a car with CVT by bond graph theory. According to the fuzzycontrol method with the expert system, a fuzzy control system of car starting process to weaken thejerk motion is introduced. The simulation results indicate that the jerk motion of clutch startingis below 10 m/s^3.
文摘Start-up working condition is the key to the research of optimal engagementof automatic clutch for AMT. In order to guarantee an ideal dynamic performance of the clutchengagement, an optimal controller is designed by considering throttle angle, engine speed, gearratio, vehicle acceleration and road condition. The minimum value principle is also introduced toachieve an optimal dynamic performance of the nonlinear system compromised in friction plate wearand vehicle drive quality. The optimal trajectory of the clutch engagement can be described in theform of explicit and analytical expressions and characterized by the deterministic and accuratecontrol strategy in stead of indeterministic and soft control techniques which need thousands ofexperiments. For validation of the controller, test work is carried out for the automated clutchengagements in a commercial car with an traditional mechanical transmission, a hydraulic actuator, agroup of sensors and a portable computer system. It is shown through experiments that dynamicbehaviors of the clutch engagement operated by the optimal control are more effective and efficientthan those by fuzzy control.
基金National Natural Science Foundation of China(No.51405010)National Science and Technology Support Program,China(No.2011BAG09B00)
文摘The electro-hydraulic clutch control system controls the transferred torque of gear-shifting clutches in clutch-to-clutch transmissions. A nonlinear dynamic model of an electro-hydraulic clutch shift control system is presented. The mechanical and fluid subsystems of all valves are investigated, including their interactions. Model validation of the electro-hydraulic valve system is performed by comparing the simulated and measured pressure curves. The dynamic characteristics of the electro-hydraulic clutch shift control system with different supply pressures and different fluid temperatures are simulated and evaluated. It is found that pipes which are often ignored between the electro-hydraulic valve system and the clutch piston,have strong influence on clutch piston chamber pressures. In order to satisfy the required time and reduce the fluctuation of the clutch piston chamber pressures,the orifices' diameters and valve structure are optimized.
基金This project is imbursed by elite university teacher supporting plan
文摘A sliding mode control approach based on the feedback linearization is proposed for the electrically controllable clutch of AMT vehicles. The nonlinear dynamic model for the hydraulic actuator associated with clutch is established. By means of the exact feedback linearization procedure of differential geometry, an equivalent, fully controllable and linear model is derived via a homomorphic transformation for the AMT clutch system.Furthermore, a sliding mode control is introduced to improve robustness. The tracking tests are performed using the sliding mode control on a Santana LX passenger car, and the experimental results prove that this nonlinear controller is of fine robustness and high degree of tracking accuracy.
文摘Based on detail analysis of clutch engaging process control targets and adaptive demands, a control strategy which is based on speed signal, different from that of based on main clutch displacement signal, is put forward. It considers both jerk and slipping work which are the most commonly used quality evaluating indexes of vehicle starting phase. The adaptive control system and its reference model are discussed profoundly. Taking the adaptability to different starting gears and different road conditions as examples, some proving field test records are shown to illustrate the main clutch adaptive control strategy at starting phase. Proving field test gives acceptable results.
文摘针对如何提高阀控离合器的位置控制精度、克服非线性等问题,该文提出了一种基于状态反馈线性化的电液伺服系统模型预测控制方案。首先建立了伺服系统状态空间模型,将非线性系统映射为新坐标空间内的线性系统模型;接着设计了一种基于马尔可夫链预测模型的反馈线性化模型预测控制器(feedback linearization model predictive controller,FLMPC),通过设计损失函数求解最优输入序列,最终作用于反馈线性化系统。仿真结果证明,在相同输入情况下,反馈线性化系统与原系统的位置误差满足控制需要,可以有效减少超调量。且在保证被控对象快速稳定控制的条件下,相比非线性模型预测控制,该算法单步计算时间更短。
文摘针对纯电动汽车两挡双离合自动变速器(two-speed dual-clutch transmission,2DCT)换挡控制模型及参数的不确定性和存在的未知干扰,提出了一种线性自抗扰(linear active disturbance rejection controller,LADRC)换挡控制策略。首先建立2DCT换挡过程动力学模型,并分析了换挡过程;然后考虑控制模型的不确定性及未知干扰,将LADRC控制器应用到换挡过程对期望角速度进行跟踪,并采用扩张状态观测器(extended state observer,ESO)对扰动进行实时估计,并加以补偿,最后与PID控制进行对比。仿真和实验结果表明,该控制器跟踪误差更小,鲁棒性强,能保证良好的换挡品质。
