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智能修正型换挡规律的设计及在双离合器式自动变速器中的应用 总被引:8,自引:0,他引:8
以车速和发动机油门为控制参数,设计双离合器式自动变速器(Dual clutch transmission, DCT)的两参数换挡规律,硬件在环仿真结果表明该控制规律在城市工况极易导致频繁换挡,在制动工况容易产生意外升挡.分析不合理换挡现象的原因,并指出驾驶员的不合理操作习惯是引起频繁换挡和意外升挡的主要原因,两参数换挡规律不易避免不合理换挡现象.基于"sugeno"型模糊控制方法,建立智能修正型换挡规律的控制系统,该系统以油门开度和油门开度变化率为输入,实时升、降挡车速的修正系数为输出,确定隶属度函数并制定相应的模糊控制规则.智能换挡系统中的降挡速度为两参数降挡曲线临界值与降挡修正系数的乘积,升挡速度为两参数升挡曲线临界值与升挡修正系数的商.控制结果表明智能换挡规律在保留两参数换挡规律优点的同时,可以避免频繁换挡及意外升挡现象的发生,提高整车的舒适性和燃油经济性. 相似文献
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分析了双离合器式自动变速器车辆的频繁换挡及意外换挡现象,指出了引起DCT车辆频繁换挡的直接原因是车速相对于油门突变的滞后,根本原因是基于稳态工况的传统换挡规律无法满足动态工况下的要求。采用基于结构风险最小化准则的支持向量机方法建立了发动机动态转矩和油耗模型,提出了基于油门、车速、油门变化率为输入的三参数换挡规律设计方法,当油门突变时,系统能够根据油门变化率实时修正换挡规律,油门突增则降挡规律减小,油门突减则升挡规律增加,从而避免发生频繁换挡及意外换挡。运用Matlab/Simulink进行了DCT车辆的换挡仿真研究,并通过了自动变速器台架实验验证。仿真和实验结果表明基于支持向量机发动机动态模型的换挡规律在保留原有换挡规律优点的基础上,可以避免频繁换挡及意外换挡现象,满足车辆实际行驶工况的需要,具有更好的动力性和燃油经济性。 相似文献
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针对湿式双离合器式自动变速器的换挡控制问题,在分析了自动变速器换挡品质评价指标的基础上,提出了双离合器式自动变速器的降挡控制策略,开发了双离合器式自动变速器的电控系统,编写了控制程序。以2挡降1挡为例,并分别在不同油门开度下进行了正扭矩降挡和负扭矩降挡实车试验,取得了良好换挡品质。通过试验验证了控制策略的有效性。试验结果表明,车辆在换挡过程中车速变化平稳,油温变化较小,该控制策略能够满足汽车降挡过程的平顺性和快捷性要求,使车辆具有良好的换挡品质。 相似文献
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不同的换挡规律对车辆的动力性和可靠性具有重要影响.根据矿用汽车动力传递系统的结构特点,分析发动机与液力自动变速箱共同工作特性,基于Matlab获取共同输入和输出特性曲线;在此基础上,根据某矿用汽车发动机数学模型,分析不同油门开度下柴油发动机调速特性数学模型;根据传统换挡规律的缺点,制定动力性换挡规律,并根据输入输出特点,获取最佳换挡点;采用Simulink和TruckSim联合的方式,搭建整车的分析数学模型;分析不同的循环工况下,各种换挡规律的差异.结果可知:以油门开度和车速为基础,获得车辆的理论换挡点,获得车辆的理论换挡曲线;动力性换挡规律作用下,使得不同装载和坡度时,车辆换挡时的速度发生变化,速度明显提升;动力性换挡规律更适应于矿用汽车的工作环境,既保证车辆的动力性要求,同时可以提高整车的操控稳定性. 相似文献
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依据叉车工作泵的压力大小分为空载、满载、半载3种工况,计算叉车输入特性、输出特性和牵引特性,据此建立了以油门开度、车速和油泵压力为控制参数的三参数换挡规律;设计了基于dSPACE的实车快速控制原型试验,验证了换挡控制策略和执行机构策略;设计了自动变速器控制器(TCU)样机和硬件在环仿真试验台,进行了基于dSPACE的硬件在环试验,验证了控制策略在TCU样机中的控制效果。试验结果表明:基于dSPACE开发的TCU满足性能要求,并能提高开发效率,可为叉车自动变速器控制器的开发提供参考。 相似文献
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ZHANG Hongyan ZHAO Dingxuan TANG Xinxing Ding Chunfeng 《机械工程学报(英文版)》2008,21(1):20-24
From the viewpoint of energy saving and improving transmission efficiency, the ZL50E wheel loader is taken as the study object. And the system model is analyzed based on the transmission system of the construction vehicle. A new four-parameter shift schedule is presented, which can keep the torque converter working in the high efficiency area. The control algorithm based on the Elman recursive neural network is applied, and four-parameter control system is developed which is based on industrial computer. The system is used to collect data accurately and control 4D180 power-shift gearbox of ZL50E wheel loader shift timely. An experiment is done on automatic transmission test-bed, and the result indicates that the control system could reliably and safely work and improve the efficiency of hydraulic torque converter. Four-parameter shift strategy that takes into account the power consuming of the working pump has important operating significance and reflects the actual working status of construction vehicle. 相似文献
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OPTIMAL TORQUE CONTROL STRATEGY FOR PARALLEL HYBRID ELECTRIC VEHICLE WITH AUTOMATIC MECHANICAL TRANSMISSION 总被引:3,自引:1,他引:2
GU Yanchun YIN Chengliang ZHANG Jianwu School of Mechanical Engineering Shanghai Jiaotong University Shanghai China 《机械工程学报(英文版)》2007,20(1):16-20
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. 相似文献
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STUDY ON SHIFT SCHEDULE AND SIMULATION OF AUTOMATIC TRANSMISSION 总被引:3,自引:1,他引:2
0 INTRODUCTIONThe main powertrain of engineering vehicle,suchas loader, bulldoZer and scraper etc, adopthydrodynamic drive in order to improve theadaptability to heavy lo.d[ l '2]. However, the transm-ission efficiency of hydrodynamic drive is very lOw,especially althOugh driveline is supposed to supplyhuge power under heavy load, it contrarily degradelargely even to zero. Hydrodynamic drive causes workefficiency low, and energy waste. The wasted energywas transfOrmed into heat lead to o… 相似文献
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Shifting Rule Modification Strategy of Automatic Transmission Based on Driver-vehicle-road Environment 总被引:1,自引:0,他引:1
Accidental or frequent shift often occurs when the shifting rule is built based on traditional two parameters (I.e., velocity and throttle), because the speed of engine varies slower than change of throttle opening. Currently, modifying shift point velocity value or throttle by throttle change rate is one of common methods, but the results are not so satisfactory in some working condition such as uphill. The reason is that these methods merely consider throttle change rate which is not enough for a car driving in driver-vehicle-road environment system. So a novel fuzzy control modification strategy is proposed to avoid or reduce those abnormal shift actions. It can adjust shifting rule by the change rate of throttle, current gear position and road environment information, while different gear position and driving environment get corresponding modification value. In order to compare the results of shifting actions, fuel consumption and braking distance, emergent braking in level road and extra-urban driving cycle(EUDC) working conditions with fuzzy shifting schedule modification strategy are simulated digitally. Furthermore, a hardware-in-the-loop simulation platform is introduced to verify its effect in slope road condition according to the ON/OFF numbers of solenoid valve in hydraulic system. The simulation results show that the problem of unexpected shift in those working conditions may be resolved by fuzzy modification strategy. At last, it is concluded that although there is some slight decline in power performance in uphill situation, this fuzzy modification strategy could correctly identify slope of road, decrease braking distance, improve vehicle comfort and fuel economy effectively and prolong the life of clutch system. So, this fuzzy logic shifting strategy provides important References for vehicle intelligent shifting schedule. 相似文献
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为了实现汽车驾驶机器人对给定车速的准确跟踪,提出了一种驾驶机器人车速跟踪神经网络控制方法。网络模型输入层变量为驾驶机器人油门和制动器、离合器机械腿、换挡机械手的位移;中间层为隐层,节点数为5,神经元传递函数为正切传递函数;输出层变量为试验车辆车速,神经元传递函数为线性传递函数。结果表明,该方法的收敛速度明显高于梯度下降法的收敛速度,且达到的控制精度更高,车速跟踪误差满足国家汽车试验标准的要求。 相似文献
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智能换挡是车辆自动变速技术的发展方向.为此以最佳动力性作为控制目标,研究了工程车辆的动力换挡变速器如何实现智能化控制的问题.以装备有4D180型液力机械式变速器的 ZL50装载机为对象,建立了工程车辆动力传动系统仿真模型,在此基础上,应用混沌神经网络(CNN)设计了工程车辆自动换挡智能控制系统,并利用 Matlab 软件进行了仿真,仿真结果表明:所提出的智能换挡控制系统的结构和算法是可行的,可以实现工程车辆的自动换挡. 相似文献