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.

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.

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.

Study of Controlling Clutch Engagement for AMT Based on Fuzzy Logic

The control of the clutch engagement for an automatic mechanical transmission in the process of a tracklayer getting to start is studied. The dynamic model of power transmission and automatic clutch system is developed. Using tools of Simulink, the transient characteristics during the vehicle starting, including the jerk and the clutch slip time, are provided here. Based on the analyses of the simulation results and driver’s experiences, a fuzzy controller is designed to control the clutch engagement. Simulation results verify its value.

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.

混合动力汽车无同步器AMT主动同步控制策略

以混合动力商用车电控机械式自动变速器(Automated Mechanical Transmission,AMT)换挡过程为研究对象,以减小换挡冲击和缩短换挡时间为目的,使用Simulink搭建了包含动力源动态协调与基于最优控制原理的电动机主动同步控制的无同步器换挡控制模型,并使用AMESim建立了动力系统及整车动力学仿真模型;以5挡升至6挡为例,采用AMESim与Simulink开展联合仿真分析,并与传统换挡策略的换挡性能进行了对比。仿真结果表明,换挡过程中,同步时间缩短21.42%,最大冲击度减少24.88%,整个换挡时间缩短18%。最后,基于dSPACE半实物仿真平台对所提控制策略进行了实时验证。

AMT车辆低附着路面起步控制研究

针对机械式自动变速器(AMT)车辆低附着路面起步行驶驱动轮打滑问题,以装备了6挡AMT的轻卡车型为研究对象,根据AMT系统与防抱死制动系统(ABS)轮速判断车辆低附着路面起步驱动轮打滑情况,对低附着路面车辆起步进行动力学分析,提出AMT车辆低附着路面起步控制策略,设计相应控制软件,在低附着路面进行实车测试验证。试验结果表明,该研究方法能够很好地满足AMT车辆低附着路面起步的要求,有效避免驱动轮打滑,提高车辆操纵稳定性,具有很强的实用性。

两挡AMT纯电动汽车的换挡协调控制及仿真研究

与传统内燃机汽车相比,纯电动汽车在环保方面具有显著优势,大力发展电动汽车已经成为汽车产业发展主流趋势.以纯电动汽车自动变速器(Automated Mechanical Transmission,AMT)为研究对象,对其参数换挡协调控制进行了研究.按照控制参数的变化实现换挡,根据电动机特性和汽车行驶动力学方程,应用MATLAB/Simulink搭建车辆模型,进一步制定换挡控制策略,并对其进行仿真模拟验证.仿真结果表明,建立的仿真模型和设计的换挡规律是合理可行的.

Shifting force control of an AMT heavy-duty truck based on manual shift test

Taking a heavy-duty truck as a research platform,the changing characteristics of shifting force,shift time,and slipping work are obtained through theoretical analysis and manual shift test of a real vehicle. Based on the analysis of the test results,a gear-shifting control strategy of the hydraulic automated shift control system is designed and experimentally verified on the bench. By optimizing the control parameters of high-speed switching valves,a control strategy and parameters are obtained,which can meet the requirements of dynamic performance and reliability.

基于SolidWorks的自动去毛刺机设计

目前钣料人工去毛刺的方法存在加工效率慢、打磨质量不稳定的缺点,为了解决这个问题,设计了一款自动去毛刺机。该机器依据辊筒输送机的结构进行机械设计,并借助机械传动等基础知识,通过SolidWorks编程软件进行设计。首先,阐述了该设备的设计原理及技术特点;其次,对该设备的机械结构组成进行了介绍;然后建立了PLC控制系统及介绍关键电器元件的作用;最后,在SolidWorks软件上进行测试设备的实际性能,结果表明,自动去毛刺机能够有效地去除钣料上的毛刺,并实现自动化加工的要求。与传统手工去毛刺工艺相比,该设备具有加工效率高、去除毛刺质量稳定等特点,且可以节省劳动力,为企业降低用工成本。

基于动力系统协调控制的AMT换挡品质研究

配备AMT机械式自动变速器的车辆在换挡时变速器的速比会突然发生变化,致使发动机输出轴和变速器输出轴之间产生转速差、车辆出现冲击、离合器产生过度磨损等情况。基于此,提出了换挡过程中精确控制发动机转速和转矩的反馈控制、时间最优控制和PID控制相结合的协调控制算法,以及利用电机的辅助作用,快速补充换挡过程中的动力中断,提高了换挡品质。建立综合考虑发动机、电动机、离合器和电子节气门相互协调控制的换挡控制策略。通过仿真试验,表明该控制策略能有效地提高换挡品质。

基于扩张观测器的HMCVT换段离合器油压跟踪控制

针对液压机械无级变速器(HMCVT)换段离合器油压跟踪控制过程中,不匹配干扰造成实际油压与期望油压产生偏差的问题,提出了一种基于扩张观测器的全局终端滑模控制算法,以实现油压的高精度跟踪控制。通过建立带有不匹配干扰的非线性湿式离合器数学模型,推导了油压控制系统的状态方程,使用扩张观测器对不匹配干扰进行估计,设计了一种能够快速收敛的全局终端滑模控制算法,并将干扰估计值补偿到控制算法中以提高控制精度和降低滑模控制的抖振。基于全局终端滑模控制算法设计了换段离合器油压跟踪控制器,通过试验对控制器效果进行了验证。结果表明,扩张观测器能够有效观测不匹配干扰,与传统终端滑模控制算法相比,基于本文算法设计的油压跟踪控制器动态响应时间仅为0.13 s,超调量为0.08 MPa,且无明显抖振。在换段过程中,冲击度降低12.7%,滑摩功减少10.2%,表明所提油压跟踪控制算法具有较好鲁棒性,能够改善换段离合器的接合品质。

机械自动化在食品包装领域的应用研究

食品包装机械的种类较多,操作过程也较为复杂,需要推动食品包装机械的自动化发展。将自动化机械应用于食品包装领域,可以控制食品品质、减少原材料浪费,使食品行业满足市场需求,对食品行业的发展具有重要意义。

新型液压机械双流传动模式切换分析与控制研究

以自主开发的新型液压机械双流传动(HMT)系统为研究对象,分析了HMT系统的结构与工作特性。在此基础上,建立了HMT模式切换过程的数学模型与AMESim模型,并进行传动模式切换过程分析,获得HMT传动模式切换特性的影响因素。针对HMT模式切换过程存在的功率循环问题,提出了考虑功率循环的HMT模式切换策略。针对HMT模式切换过程中的速度波动问题,提出了基于马达输出转矩补偿的模式切换控制方法。仿真与试验结果表明:考虑功率循环的HMT传动模式切换策略可有效减小循环功率;基于马达输出转矩补偿的模式切换控制可有效减小速度的大范围波动。

基于扰动前馈补偿的HMT换段离合器控制方法

液压机械传动装置(hydro-mechanical transmission,HMT)是一种机-液耦合的强非线性系统,在换段过程中存在外界负载扰动和建模误差等因素影响其换段品质。该研究在分析HMT组成及工作原理的基础上,建立了HMT换段过程动力学模型和线性二次型控制模型,提出一种基于扰动前馈补偿的换段离合器控制方法,借助扰动观测器估计HMT换段过程的总扰动,将扰动补偿增益引入控制器的前馈项,实现扰动前馈补偿,并设计了抑制换段过程扰动的控制器。仿真结果表明,与未采用扰动前馈补偿控制相比,扰动前馈补偿控制的扰动值最大降低了48.9%、冲击度降低了27.8%、滑摩功减少了29.6%、换段时间减少了15.3%。最后通过试验验证了所提方法在快速处理换段过程扰动的同时,可较好地提升HMT的换段品质。研究结果可为液压机械传动装置的工程应用提供参考。

MPC-Based Downshift Control of Automated Manual Transmissions

Automated manual transmissions,which usually adopt synchronizers to complete the gear shift process,have many advantageous features.However,the torque interruption and the challenging control objectives during the gear shift process limit its industrial application,especially for the power-on gear downshift.This paper proposes a model predic-tive control(MPC)method to control the clutch engagement process and effectively shorten the torque interruption,consequently enhancing the gear downshift quality.During the control law deduction,the proposed MPC also accounts for time-domain constraints explicitly.After the control law was deduced,it was validated through simulations under two typical power-on gear downshift working scenarios.Both of the simulation results demonstrate that the controller proposed in this paper can shorten the torque interruption time during power-on gear downshifts while minimizing vehicle jerk for overall satisfactory drivability.

离合器起步过程的控制策略

离合器起步控制是电控机械式自动变速器(Automated mechanical transmission,AMT)发展过程中的一项关键技术。本文基于起步性能评价指标的分析,提出维持发动机恒速的离合器起步控制原则,并将实现该原则的控制方法应用于桑塔纳2000型轿车,从而有效地提高了车辆的起步品质。

湿式双离合器自动变速器起步控制

针对装有湿式双离合器自动变速器的起步控制问题,根据起步控制评价指标,制订起步控制策略,提出了基于模糊PID控制离合器压力的控制方法,实现了离合器压力的精确控制,给出起步控制流程。通过3种不同油门开度的起步试验和短时间连续起步停车试验,验证该控制策略。试验结果表明,该控制策略能够适应不同工况的起步要求,离合器油温得到良好控制。

湿式双离合器自动变速器的起步控制

针对湿式双离合器自动变速器起步平稳性差、滑摩功大的问题,根据双离合器自动变速器的自身结构特点,提出两个挡同时参与起步过程的控制策略,并给出程序流程图.采用基于模糊PID控制的离合器压力控制方法,实现了离合器压力的精确控制.通过3种不同节气门开度的起步试验和短时间连续起步停车试验,以验证该控制策略的有效性.试验结果表明,离合器压力控制算法适应性强,起步控制策略能够适应各种不同工况的起步要求.

机械式自动变速器系统的离合器起步模糊控制

机械式自动变速器 (AMT)车辆取消了离合器踏板 ,离合器的分离与接合由电子控制单元 ECU控制 ,起步时离合器的控制一直是 AMT技术的一个难点 ,本文通过分析车辆起步时的离合器接合过程 ,应用模糊控制技术对机械式自动变速器在车辆起步时的离合器接合过程进行控制 ,并在装有 AMT系统的轻型车上进行了实车试验 。