共查询到19条相似文献,搜索用时 116 毫秒
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针对目前防抱死制动系统(ABS)产品试验过程中存在的问题,对汽车ABS性能试验台作了深入研究。为了给汽车ABS提供一种在实验室环境下经济高效合理的测试手段,设计出一种能够较为准确地模拟汽车实际工作情况的ABS制动试验台。介绍了该试验台的结构特点、设计原理及关健技术,为汽SABS的试验和教学提供了新的解决方法。 相似文献
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根据ABS制动试验台的测量记录的制动管路压力变化数据,对Jetta-GTX轿车制动管路的压力增减变化特性进行了建模,通过对模型曲线和试验曲线的对比表明,利用最小二乘曲线拟合法直接识别得到模型的参数,从而可以较好地拟合ABS系统制动轮缸的压力变化。 相似文献
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根据ABS制动试验台的测量记录的制动管路压力变化数据,对Jetta-GTX轿车制动管路的压力增减变化特性进行了建模,通过对模型曲线和试验曲线的对比表明,利用最小二乘曲线拟合法直接识别得到模型的参数,从而可以较好地拟合ABS系统制动轮缸的压力变化。 相似文献
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《机械设计》2016,(11)
为深入研究电动汽车机电复合回馈制动过程,评估各种回馈制动控制策略的有效性,设计了一种缩小比例的电动汽车机电复合回馈制动模拟试验台。基于相似原理,详细推导出了缩比试验和原型试验物理量之间相似关系的系列方程;利用模块化思想设计了试验台结构,根据电动汽车制动转矩的实际控制过程,确定了试验台控制方案,并采用虚拟仪器技术开发了试验台的测控软件。在制动能量最大化机电复合回馈制动模糊控制策略下,以试验台电机转速为1 530 r/min为初始转速(对应初始制动车速为60 km/h),进行匀减速制动试验,实际制动转矩能很好地跟随理论需求制动转矩变化而变化;以超级电容吸收的电机回馈能量计算,相对消耗的总制动能,能量回馈率达到了5.1%。试验结果表明,模拟试验台较好地实现了电动汽车机电复合回馈制动过程,并可用于评估控制策略的有效性。 相似文献
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当前自动扶梯附加制动器试验只能在现场整梯上进行,为了提高制动试验的便利性,降低实验成本,设计了一种附加制动器试验台,利用虚拟样机技术,对实际工况下的制动试验进行模拟并验证其可靠性。通过三维软件CATIA建立附加制动器试验台三维实体模型;然后,利用多体动力学仿真软件ADAMS建立试验台的动力学模型,并进行制动器运动学和动力学仿真;基于此,在Simulink中搭建试验台控制系统,通过Adams Controls模块将动力学模型与控制系统模型组合建立联合仿真系统。根据自动扶梯制动工况条件,对其进行制动试验仿真,结果表明,该模型的计算结果与理论值较为一致,验证了试验台联合仿真模型的可靠性,其中不同工况条件下的仿真试验数据可用于改进试验台的结构设计。该研究成果可为附加制动器试验提供了高效可行的方法。 相似文献
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为了实现车辆制动模拟试验中附着系数的准确模拟和实时可调,设计了一种汽车制动模拟试验台,通过控制磁粉离合器励磁电流,实时模拟不同路面附着系数;搭建了基于路面识别的单轮车辆制动系统仿真模型,进行了单一路面和跃变路面下的制动仿真;研制了车辆制动模拟实验系统,开展了单一路面下汽车制动模拟实验和跃变路面下附着系数跟踪控制实验。研究结果表明,在湿沥青路面上以120 km/h初速度制动时,相比于基于固定目标滑移率,基于路面识别的最佳滑移率下的制动距离缩短了3.1%,且在低附着路面下更为明显;单一路面下制动时车速和轮速的实验值与仿真值基本吻合;跃变路面下附着系数最大跟踪误差仅为6.2%,跟踪控制效果良好。 相似文献
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考虑路面不平度的路面识别方法 总被引:3,自引:0,他引:3
基于滑移率控制的汽车电控制动系统实现的难点在于确定不同路面下的最佳滑移率。不平路面上路面不平度引起的动载荷会对汽车车轮速度、滑移率、制动力系数等参数带来波动,间接影响路面识别。在两种轮胎模型的基础上,将汽车平日里行驶的路面划分为6种类型,提出一种能适应不平路面的识别算法。依据路面最佳滑移率前制动力系数-滑移率曲线下的封闭面积构造一个能代表典型路面特征参数的特征值,给出6种典型路面的特征值区间并据此识别汽车当前行驶路面。建立含路面不平度激励的14自由度汽车动力学模型,通过在单一路面和对接路面上的汽车制动模拟试验验证了识别算法的有效性。结果表明算法能在不平路面上较准确、快速地识别当前给定路面状态并将识别结果便捷地用于汽车电控制动系统的最佳滑移率控制。 相似文献
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Ning Li Xiaobin Ning Qiucheng Wang Jiliang Li 《Journal of Mechanical Science and Technology》2017,31(6):2691-2699
To obtain a reasonable match of the main parameters of a hydraulic regenerative braking system and to improve the energy recovery efficiency, this paper establishes the corresponding mathematical models and testbed for a hydraulic regenerative braking system. The proposed system is analysed and verified through simulation and experiments. Then, the linear and nonlinear mathematical models of a full vehicle are built, with joint simulation of the hydraulic regenerative braking system, and the influence of the hydraulic regenerative braking system on braking performance under different running conditions is discussed. The results indicate that the deviations in the simulation results between the linear and nonlinear dynamic models are very small. When the brake deceleration and road adhesion coefficient are 0.2, deviations are within 1.38 %. With an increase in the braking deceleration and road adhesion coefficient, the deviations in braking time and distance between the systems become larger and larger. When the braking deceleration and road adhesion coefficient are 0.7, the deviation reaches 30 %. Finally, with braking energy recovery efficiency and braking distance as the optimization objectives, the nonlinear braking energy recovery system parameters are optimized. After optimization, the energy recovery efficiency of the nonlinear system reaches 76.3 %, and the braking distance is 22.8 m. 相似文献
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This work presents a hydraulic anti-lock braking system (ABS) for a motorcycle. The ABS has a hydraulic modulator and an intelligent
controller. The hydraulic modulator is analyzed, and then equipped on a scooter for road tests. The intelligent controller
controls the hydraulic modulator by estimated vehicle velocity to calculate the slip ratio of the wheels in real time. The
performance of the hydraulic modulator and intelligent controller are assessed by the hardware-in-the-loop (HIL) simulations
and road tests. In HIL simulation, the ABS is tested for different initial braking velocities on roads with different adhesive
coefficients. Furthermore, both HIL simulations and road tests are conducted on a one-phase pavement road and three-phase
pavement road. 相似文献
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Jimoh O. Pedro Olurotimi A. Dahunsi Otis T. Nyandoro 《Journal of Mechanical Science and Technology》2012,26(12):4115-4130
A direct adaptive neural network-based feedback linearization (NNFBL) slip control scheme for an antilock braking system (ABS) is presented. The NNFBL slip controller is developed to minimise the vehicle braking distance and to simultaneously improve its overall ride comfort and road handling. The comprehensive vehicle model incorporates the passive suspension dynamics, the dynamics of the electro-mechanical based braking system and air drag and wheel bearing friction. A feedforward, multilayer perceptron (MLP) neural network (NN) model that is well suited for control by discrete input-output linearization (NNIOL) is selected to represent the ABS with passive suspension. The NN model was trained using Levenberg-Marquardt optimization algorithm. The controlled signal was further boosted using a genetic algorithm generated gain. The effectiveness of the proposed controller is demonstrated by simulation results, in the presence of deterministic road disturbance input to the suspension and varying road conditions. The results are superior with respect to braking distance minimization and also to reference slip tracking, especially on the dry asphalt road. 相似文献
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针对纯电动汽车电液复合制动系统电机再生制动力与液压制动力动态响应特性的差异及其非线性特性问题,提出了一种基于Agent的电液复合制动防抱死控制方法。构建了由电机Agent、液压制动Agent和ABS Agent组成的复合制动系统,依据让步策略、竞争策略和协同策略对电机再生制动力和液压制动力协调分配。MATLAB/Simulink仿真结果表明:紧急制动状态下,各Agent间能有效协作,前轮始终先于后轮进入抱死趋势,复合制动系统可以准确识别路面附着系数变化并及时调整电机制动力与液压制动力,提高了制动稳定性与系统的自适应能力。 相似文献
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PHEV再生制动试验台建模与仿真 总被引:1,自引:0,他引:1
基于并联式混合动力结构形式,以回收整车再生制动能量为目的,应用模块化设计思想建模,搭建了一套整车再生制动试验平台。提出了一种并行制动力分配下的再生制动控制策略,建立了再生制动系统中主要元件的数学模型。为了验证再生制动试验台系统的性能以及工作可靠性,在MATLAB/Simulink平台上,通过试验数据和数学模型相结合的1方式建立再生制动系统的仿真模型。选择国际通用城市道路循环UDDS工况下进行仿真,仿真结果表明,再生制动能量得到有效回收,验证了提出的再生制动试验台结构及其控制策略的合理性。 相似文献
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The accurate estimation of road friction coefficient in the active safety control system has become increasingly prominent. Most previous studies on road friction estimation have only used vehicle longitudinal or lateral dynamics and often ignored the load transfer, which tends to cause inaccurate of the actual road friction coefficient. A novel method considering load transfer of front and rear axles is proposed to estimate road friction coefficient based on braking dynamic model of two-wheeled vehicle. Sliding mode control technique is used to build the ideal braking torque controller, which control target is to control the actual wheel slip ratio of front and rear wheels tracking the ideal wheel slip ratio. In order to eliminate the chattering problem of the sliding mode controller, integral switching surface is used to design the sliding mode surface. A second order linear extended state observer is designed to observe road friction coefficient based on wheel speed and braking torque of front and rear wheels.The proposed road friction coefficient estimation schemes are evaluated by simulation in ADAMS/Car. The results show that the estimated values can well agree with the actual values in different road conditions. The observer can estimate road friction coefficient exactly in real-time andresist external disturbance. The proposed research provides a novel method to estimate road friction coefficient with strong robustness and more accurate. 相似文献
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电动自行车制动性能关乎行车安全,制动性能检测是电动自行车的重点检测项目之一。针对传统的路面检测存在的问题,搭建电动自行车整车制动性能检测平台,试验台架有机械台架结合现代工控设备组成,旨在对制动性能进行实时、精确检测;为验证检测平台设计的合理性,根据车辆动力学原理,分别建立实际道路上整车制动工况下的数学模型和台架制动检测的数学模型;利用仿真软件Matlab/Simulink进行对比分析研究。仿真结果表明,该检测平台可以比较精确检测影响整车制动性能各参数,检测平台的设计是合理的。 相似文献