Adaptive Clutch Engaging Process Control for Automatic Mechanical Transmission

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.

OPTIMAL TORQUE CONTROL STRATEGY FOR PARALLEL HYBRID ELECTRIC VEHICLE WITH AUTOMATIC MECHANICAL TRANSMISSION

In parallel hybrid electrical vehicle （PHEV） equipped with automatic mechanical transmission （AMT）, the driving smoothness and the clutch abrasion are the primary considerations for powertrain control during gearshift and clutch operation. To improve these performance indexes of PHEV, a coordinated control system is proposed through the analyzing of HEV powertrain dynamic characteristics. Using the method of minimum principle, the input torque of transmission is optimized to improve the driving smoothness of vehicle. Using the methods of fuzzy logic and fuzzy-PID, the engaging speed of clutch and the throttle opening of engine are manipulated to ensure the smoothness of clutch engagement and reduce the abrasion of clutch friction plates. The motor provides the difference between the required input torque of transmission and the torque transmitted through clutch plates. Results of simulation and experiments show that the proposed control strategy performs better than the contrastive control system, the smoothness of driving and the abrasion of clutch can be improved simultaneously.

Defect Analysis and Innovation Design of Synchronizer for Clutchless Automatic Mechanical Transmission

The synchronizer is a key component of automatic mechanical transmission(AMT)equipped in electric vehicles,but the inertial lock-ring synchronizer(ILRS)commonly used there is not suitable especially for pure electric vehicles without a clutch because of big shift impact.To make the shifting process rapid and smooth,a new synchronizer named pressure-controllable friction ring synchronizer(PCFRS)was designed.Initially,the inevitable shortcoming of ILRS was verified by simulation and test.Furthermore,the mechanical characteristics and advantages of the new synchronizer over ILRS were analyzed.Then,the formulations describing the dynamic transmission based on the working mechanism of the PCFRS were established.Finally,the shifting simulation results with PCFRS and ILRS based on the same operating conditions were compared and analyzed.The research shows that the PCFRS can meet the main shifting evaluation index of an AMT without complex control methods,as well as it takes only 0.2406 s to finish the comfortable and zero-speed-difference shifting.The shifting quality of PCFRS is better than that of the ILRS.It lays a foundation for using the new synchronizer as a part of clutchless AMTs equipped in pure electric vehicles.

Strategy to control crawling vehicles with automated mechanical transmission

In order to move vehicles with automated mechanical transmission （AMT） a little bit of distance, such as reversing into or moving in a garage, a control strategy for crawling vehicles was proposed. Based on the dynamic analysis of vehicle starting process and requirements of crawl driv- ing for the vehicle, a control strategy of the clutch was designed. The strategy increased the.slipping friction torque first and then decreased it, in order to realize the crawl driving. The speed increased by the engagement of the clutch, and then the clutch turned to disengage to the half disengage point, when the speed met the requirements. Based on the control strategy, a control software was de- signed. In the end, the software was tested on a vehicle with AMT. The lowest steady vehicle speed was reduced to 40% of the original value, which was set in the control strategy.

Design and application of electric oil pump in automatic transmission for efficiency improvement and start–stop function

For the purpose of improving efficiency and realizing start–stop function, an electric oil pump(EOP) is integrated into an 8-speed automatic transmission(AT). A mathematical model is built to calculate the transmission power loss and the hydraulic system leakage. Based on this model, a flow-based control strategy is developed for EOP to satisfy the system flow requirement. This control strategy is verified through the forward driving simulation. The results indicate that there is a best combination for the size of mechanical oil pump(MOP) and EOP in terms of minimum energy consumption. In order to get a quick and smooth starting process, control strategies of the EOP and the on-coming clutch are proposed. The test environment on a prototype vehicle is built to verify the feasibility of the integrated EOP and its control strategies. The results show that the selected EOP can satisfy the flow requirement and a quick and smooth starting performance is achieved in the start–stop function. This research has a high value for the forward design of EOP in automatic transmissions with respect to efficiency improvement and start–stop function.

基于工况预测的电动汽车两挡AMT换挡过程控制

电动汽车两挡AMT换挡过程中,在驱动电机扭矩卸载和恢复阶段,驱动电机扭矩变化速率对冲击度影响最为明显,而冲击度和换挡时间是对立的,为了平衡换挡时间和冲击度,提升换挡品质,提出一种基于工况预测的扭矩控制策略。采用欧几里得贴近度识别车辆实际行驶工况类型,建立径向基函数(Radial Basis Function,RBF)神经网络预测未来行驶车速信息;设计模糊控制器识别驾驶员期望换挡类型,在驱动电机扭矩卸载和恢复阶段,输出相应换挡类型的驱动电机扭矩变化速率。仿真分析和实车验证表明:基于工况预测的扭矩控制策略可根据预测车辆的实际行驶工况实时调整驱动电机扭矩卸载和恢复阶段的驱动电机扭矩变化速率,平衡换挡时间和冲击度,满足了驾驶员对换挡平顺性和动力性的需求,有助于实现换挡品质的提升。

一种纯电动AMT换挡控制方法研究

针对纯电动机械式自动变速器(Automatic Mechanical Transmission, AMT)动力中断时间长、换挡性能差等问题,基于典型换挡过程构建了以摘挡、调速过程时间最优为目标的方法,提出了换挡过程中时间重叠的控制策略,以优化换挡控制方法。基于换挡过程理论分析确定了控制策略方案并通过台架试验进行了验证。结果表明:当变速箱位置传感器信号脱离设定的在挡位置时,永磁同步电机便可以降扭矩从而缩短时间;永磁同步电机在调速过程中进行部分进挡,进挡位置点控制在同步点附近,从而在挂挡时缩短进挡行程,有效缩短挂挡时间。换挡控制方法优化后纯电动AMT换挡时间缩短了28.2%,提高了纯电动AMT的换挡性能。

Slow driving control of tracked vehicles with automated mechanical transmission based on fuzzy logic

In order to move tracked vehicles at an extremely slowspeed with automated mechanical transmission（ AMT）,slowdriving function was added in the original system. The principle and requirement of slowdriving function were analyzed. Based on analysis of slow driving characteristic,identification of slowdriving condition and fuzzy control algorithm,a control strategy of the clutch was designed. In order to realize slowdriving,the clutch was controlled in a slipping mode as manual driving. The vehicle speed was increased to a required speed and kept in a small range by engaging or disengaging the clutch to the approximate half engagement point. Based on the control strategy,a control software was designed and tested on a tracked vehicle with AMT. The test results showthat the control of the clutch with the slowdriving function was smoother than that with original systemand the vehicle speed was slower and steadier.

马尔科夫链关联下电动汽车机械变速器可靠性评估方法设计

可靠性评估理论应用到电动汽车机械式变速器齿轮系的设计中,当前方法多是根据电动汽车动力性要求,在保证零件结构强度和刚度可靠使用的条件下,以变速器安全和功率使用区间为目标函数,建立了汽车机械式变速器多目标可靠性模型,但是这种方式忽略了目标之间的整体关联性。为此,设计一种电动汽车机械变速器可靠性评估方法。对电动汽车机械变速器各个部件展开运行模式分析,确定影响其可靠性的主要因素。根据运行模式分析的结果,使用状态枚举和蒙特卡洛抽样方法得到各个故障模式的马尔科夫链,并进行时域离散化处理,根据时域离散化处理得到的状态样本,构建模拟状态转移矩阵,可以计算出电动汽车机械变速器的可靠性指标,用于评估自动变速器的可靠性能。实验结果表明,采用所提方法可以获取高精度和高效率的电动汽车机械变速器可靠性评估结果。

AMT离合器接合过程中的压力控制

为了解决离合器特性在AMT的批量生产中出现较大的离散性和在长期运行过程中因磨损等导致的漂移等问题,提出了一种基于压力控制的离合器控制方法。该方法可以直接控制离合器传递扭矩的大小,而且与离合器的制造、装配误差和磨损情况无关。有效地改善了AMT的离合器控制性能,并且为AMT的批量生产提供了保证。

重型车辆AMT硬件在环仿真试验研究

以重型车辆电控机械式自动变速器(permanent magent synchronous motor,AMT)样机开发为应用背景,基于MATLAB/Simulink/Stateflow/RTW与dSPACE软硬件系统,开发了重型车辆AMT硬件在环仿真试验系统。利用该系统实时验证组合型两参数换挡控制策略,并进行了平路起步、坡道起步以及连续加、减挡AMT样车道路试验。结果表明:所开发的硬件在环仿真系统能快速、有效地验证重型车辆AMT控制策略,正确评估其综合性能,为重型车辆AMT控制器的开发提供了很好的系统测试平台。

电动客车AMT系统的研究与实现

研究适用于电动客车的电控机械式自动变速系统(AMT),实现无离合器换挡控制.按照AMT系统设计准则研制了电动客车AMT.引入CAN总线技术,实现了AMT与交流电机的协调控制.提出了电动客车AMT换挡控制策略,改善换挡品质.对ECU进行了电磁兼容性设计,使之能正常工作.在交通部公路试验场进行的试验表明,所研制的电动客车AMT系统达到了预定的技术指标.

轻度混合动力AMT汽车自动起步控制研究

利用ISG(integrated starter/generator)电机的助力功能,在车辆起步时辅助发动机工作,将动力源(发动机和 ISG电机)转速维持在较低范围内,使车辆迅速平稳起步,大大减少了离合器的滑摩功。在建立轻度混合动力 AMT汽车起步模型的基础上进行了仿真,并提出了车辆自动起步控制规律。

混合动力汽车上AMT的换挡过程分析

基于电机控制器速度环的快速转速调节响应特点,提出了换挡过程借助电机速度调节、缩短换挡过程啮合齿轮同步时间的电机与自动机械变速器的综合协调控制方法.以研制的GZ6110HEV混联式混合动力电动大客车为例,建立系统的动力学模型,通过仿真和试验,证明该方法能大大缩短换挡时间,是有效和实用的.

越野车辆AMT消除意外换挡及频繁换挡策略研究

提出了油门钝化方法,用于解决装备AMT变速器的越野车辆经常出现车辆意外换挡及频繁换挡的问题.讨论了油门钝化控制策略对解决意外换挡及频繁换挡问题的可行性及其影响因素,通过采用步进的方式对油门信号进行处理,可以有效屏蔽短时间内油门剧烈变换对车辆换挡的影响.设计了油门钝化控制策略及控制软件.实车试验结果表明,采用油门钝化控制策略的越野车辆意外换挡及频繁换挡的现象得到了有效控制.

气动AMT系统故障诊断研究

为增强机械式自动变速器(AMT)故障诊断和容错运行能力,提高系统可靠性和稳定性,研究气动AMT故障诊断系统.以应用于重型商用车的12挡气动AMT系统为平台,采用信号检测、解析冗余、实时跟踪的诊断方法及冗余替代、开环控制、反馈量更换的容错处理方法,开发了遵循ISO15765协议的故障诊断系统.试验证明,所设计故障诊断系统能及时监测、判断气动AMT系统故障,并可采取有效容错措施,保证故障车辆的行驶能力.

基于流量阀的自动操纵机构的AMT离合器改装研究

分析了离合器操纵部件之间的运动关系,设计了基于流量电磁阀的离合器自动操纵机构和车辆起步过程的离合器自动控制策略,接着进行了离合器自动操纵机构基本性能的台架试验,最后,在原装用气助力式离合器操纵机构的北方奔驰重型商用车上改装,并进行了实际道路试验,验证了其实用性。

电动车辆AMT换挡过程中驱动电机控制策略

结合电动车辆的结构形式及其工作原理,研究了适用于电动车辆AMT(automated mechanical transmission)换挡过程的驱动电机控制策略,实现了AMT正常换挡.分析了制动状态下电机回馈制动力矩对AMT换挡的影响,提出了制动状态下AMT换挡时驱动电机控制策略.在纯电动环卫车上进行实车调试,结果表明,该控制策略可行,整个换挡时间约为1 s.

基于AMT的自动换挡协调控制策略研究

为了改善电控机械式自动变速箱(automated mechanical transmission,AMT)自动换挡品质,文章针对电机-变速器一体化电驱动系统的控制特点,在分析无离合动力传动系统自动换挡原理的基础上,制定了自动换挡协调控制系统框架和实现流程,提出了一种基于驱动电机转矩、转速双闭环控制的自动换挡协调控制策略。设定综合工况下的仿真试验表明,系统自动换挡协调控制策略正确、可靠,换挡品质较好。

AMT汽车起步过程节气门目标控制量的确定

根据电控机械自动变速汽车起步过程中,对不同目标油门踏板开度下传动系统冲击度的设计要求,提出一种新的节气门开度变化率目标控制量的求取方法。通过Matlab/Simulink仿真分析,建立了节气门开度变化率随目标油门踏板开度和离合器接合位移量而变化的目标控制数表。试验结果表明:所确定的节气门开度变化率目标控制数表,可有效地协调离合器接合速度与节气门开度之间的变化关系,较好地满足电控机械自动变速汽车的发动机局部恒转速起步控制策略的要求。