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对比分析了国内外车辆侧翻稳定性相关的标准法规的基本情况。研究了车辆发生侧翻的类型和机理,基于侧向加速度判断车辆侧翻状态的方法,通过整车道路试验对比了正弦停滞试验和鱼钩试验诱导车辆发生侧翻的效果,初步探讨了多用途乘用车侧翻稳定性动态测试方法和评价指标,为国内车辆侧翻稳定系统的开发和测评标准的制定提供了参考。 相似文献
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D. W. Pi N. Chen J. X. Wang B. J. Zhang 《International Journal of Automotive Technology》2011,12(3):391-399
This paper presents a method for estimating the vehicle side slip angle, which is considered as a significant signal in determining
the vehicle stability region in vehicle stability control systems. The proposed method combines the model-based method and
kinematics-based method. Side forces of the front and rear axles are provided as a weighted sum of directly calculated values
from a lateral acceleration sensor and a yaw rate sensor and from a tire model according to the nonlinear factor, which is
defined to identify the degree of nonlinearity of the vehicle state. Then, the side forces are fed to the extended Kalman
filter, which is designed based on the single-track vehicle model associated with a tire model. The cornering stiffness identifier
is introduced to compensate for tire force nonlinearities. A fuzzy-logic procedure is implemented to determine the nonlinear
factor from the input variables: yaw rate deviation from the reference value and lateral acceleration. The proposed observer
is compared with a model-based method and kinematics-based method. An 8 DOF vehicle model and Dugoff tire model are employed
to simulate the vehicle state in MATLAB/SIMULINK. The simulation results shows that the proposed method is more accurate than
the model-based method and kinematics-based method when the vehicle is subjected to severe maneuvers under different road
conditions. 相似文献
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Young H. Cho J. Kim Assistant Professor 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1996,25(1):51-69
A method to study handling characteristics of a vehicle moving along a curved path is presented. A simple bicycle model and a feedback controller with proportional gain are used to simulate the vehicle and the driver. The lateral stability of the vehicle/driver system is analyzed by using the root locus method and numerical integration in the time domain. The effect of the curvature on the system stability is discussed in detail. A new suggestion is made for the look ahead distance to calculate the preview lateral error of the vehicle with respect to the center of the road. Interesting results are shown for some important parameters such as the gain factor, the vehicle speed and the curvature of the path. Possible extensions of the method to more general cases and other applications are discussed. 相似文献
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针对改扩建高速公路单侧加宽方案老路利用时可能存在的行车稳定性问题,应用基于车辆动力学的建模仿真方法,采用联合仿真技术,在Carsim/Trucksim仿真软件中得到车辆在横坡组合路段行驶过程中车轮的垂直载荷与车辆侧向加速度;在Simulink中计算车辆的横向载荷转移率和侧向加速度;通过上述指标分析车辆横向侧翻和侧滑稳定性,判断车辆在改扩建公路横坡组合路段上的行驶稳定性;联合仿真结果表明,车辆在横向坡度为2%和1.5%、换道路长为120 m和80 m的横坡组合路段上行驶均具有良好的横向稳定性;该方法可用于其他道路和驾驶行为的车辆稳定性分析. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(9):1043-1063
The mathematical analysis of vehicle stability has been utilised as an important tool in the design, development, and evaluation of vehicle architectures and stability controls. This paper presents a novel method for automatic generation of the linearised equations of motion for mechanical systems that is well suited to vehicle stability analysis. Unlike conventional methods for generating linearised equations of motion in standard linear second order form, the proposed method allows for the analysis of systems with non-holonomic constraints. In the proposed method, the algebraic constraint equations are eliminated after linearisation and reduction to first order. The described method has been successfully applied to an assortment of classic dynamic problems of varying complexity including the classic rolling coin, the planar truck–trailer, and the bicycle, as well as in more recent problems such as a rotor–stator and a benchmark road vehicle with suspension. This method has also been applied in the design and analysis of a novel three-wheeled narrow tilting vehicle with zero roll-stiffness. An application for determining passively stable configurations using the proposed method together with a genetic search algorithm is detailed. The proposed method and software implementation has been shown to be robust and provides invaluable conceptual insight into the stability of vehicles and mechanical systems. 相似文献
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L. Xiong G. W. Teng Z. P. Yu W. X. Zhang Y. Feng 《International Journal of Automotive Technology》2016,17(4):651-663
In this paper, a novel direct yaw control method based on driver operation intention for stability control of a distributed drive electric vehicle is proposed. It was discovered that the vehicle loses its stability easily under an emergency steering alignment (EA) problem. An emergent control algorithm is proposed to improve vehicle stability under such a condition. A driver operation intention recognition module is developed to identify the driving conditions. When the vehicle enters into an EA condition, the module can quickly identify it and transfer the control method from normal direct yaw control to emergency control. Two control algorithms are designed. The emergency control algorithm is applied to an EA condition while the adaptive control algorithm is applied to other conditions except the EA condition. Both simulation results and real vehicle results show that: The driver module can accurately identify driving conditions based on driver operation intention. When the vehicle enters into EA condition, the emergent control algorithm can intervene quickly, and it has proven to outperform normal direct yaw control for better stabilization of vehicles. 相似文献
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为了提高四轮独立驱动智能电动汽车在变曲率弯道下的轨迹跟踪精度和横摆稳定性,提出了一种模型预测控制与直接横摆力矩控制协同的综合控制方法。建立了横纵向耦合的车辆动力学模型,采用2阶龙格库塔离散法保证了离散模型的精度,并基于简化的2自由度动力学模型推导了车辆横摆稳定性约束,设计了非线性模型预测控制器;利用直接横摆力矩控制能够改变车辆横摆角速度和航向角的特点,考虑模型预测控制器的预测状态、控制量以及跟踪误差,设计了协同控制规则。仿真结果表明,协同控制方法解决了考虑横摆稳定性约束的模型预测控制器中存在的稳定性约束与控制精度相矛盾的问题,并补偿了模型预测控制器没有可行解时对横摆稳定性的约束,同时提高了智能汽车的轨迹跟踪精度和横摆稳定性。 相似文献
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独立悬架汽车转向系统刚度测量 总被引:6,自引:0,他引:6
汽车转向系统刚度是影响汽车操纵稳定性的重要因素之一,本文介绍了一种实用的测量独立悬架汽车转向系统刚度的试验方法,分析了汽车转向系统的受力状况,推导了转向系统中各环节刚度的计算公式,对一辆实车进行的试验测量得到了可靠的数据结果,对进一步探讨转向系统刚度对汽车操纵稳定性的影响具有重要的意义。 相似文献
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A Fuzzy Logic Direct Yaw-Moment Control System for All-Wheel-Drive Electric Vehicles 总被引:10,自引:0,他引:10
Farzad Tahami Shahrokh Farhangi Reza Kazemi 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2004,41(3):203-221
Summary In-wheel-motors are revolutionary new electric drive systems that can be housed in vehicle wheel assemblies. Such E-wheels permit packaging flexibility by eliminating the central drive motor and the associated transmission and driveline components, including the transmission, the differential, the universal joints and the drive shaft. Apart from many advantages of such a system, unequalled independent wheel control allows vehicle dynamic improvement to assist the driver in enhancing cornering and straight-line stability on slippery roads and in adverse ground conditions. In this paper a Fuzzy logic driver-assist stability system for all-wheel-drive electric vehicles based on a yaw reference DYC is introduced. The system assists the driver with path correction, thus enhancing cornering and straight-line stability and providing enhanced safety. A feed-forward neural network is employed to generate the required yaw rate reference. The neural net maps the vehicle speed and the steering angle to give the yaw rate reference. The vehicle true speed is estimated using a multi-sensor data fusion method. Data from wheel sensors and an embedded accelerometer are fed into an estimator, where a Fuzzy logic system decides which input is more reliable. The efficiency of the proposed system is approved by conducting a computer simulation. The proposed control system is an effective and easy to implement method to enhance the stability of all-wheel-drive electric vehicles. 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(3):203-221
Summary In-wheel-motors are revolutionary new electric drive systems that can be housed in vehicle wheel assemblies. Such E-wheels permit packaging flexibility by eliminating the central drive motor and the associated transmission and driveline components, including the transmission, the differential, the universal joints and the drive shaft. Apart from many advantages of such a system, unequalled independent wheel control allows vehicle dynamic improvement to assist the driver in enhancing cornering and straight-line stability on slippery roads and in adverse ground conditions. In this paper a Fuzzy logic driver-assist stability system for all-wheel-drive electric vehicles based on a yaw reference DYC is introduced. The system assists the driver with path correction, thus enhancing cornering and straight-line stability and providing enhanced safety. A feed-forward neural network is employed to generate the required yaw rate reference. The neural net maps the vehicle speed and the steering angle to give the yaw rate reference. The vehicle true speed is estimated using a multi-sensor data fusion method. Data from wheel sensors and an embedded accelerometer are fed into an estimator, where a Fuzzy logic system decides which input is more reliable. The efficiency of the proposed system is approved by conducting a computer simulation. The proposed control system is an effective and easy to implement method to enhance the stability of all-wheel-drive electric vehicles. 相似文献
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Jianlin SUN 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》1987,16(4):227-239
The paper presents a new method to study the dynamic properties of the bridge-vehicle system. The transfer function of the system is obtained by iteration in the frequency domain instead of the time domain. The relationship between vehicle speed and the lowest natural frequency of the system is investigated and a parametric study of the system stability is made. The varying parameters concerned are the vehicle speed, the ratio of vehicle mass to bridge mass, the ratio of vehicle eigenfrequency to bridge eigenfrequence, and the relative damping of the vehicle and bridge. 相似文献
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ADAMS软件在汽车操纵稳定性研究中的应用 总被引:1,自引:0,他引:1
以转向盘转角阶跃输入为例,说明采用ADAMS对车辆操纵稳定性进行研究评价的方法及过程。利用AD-AMS软件可以进行不同车速、不同载荷下的操纵稳定性仿真,能够对车辆的操纵稳定性做出预测,为设计提供参考,这对于车辆开发前期对车辆性能的预测十分重要。 相似文献
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Active Roll Control of Single Unit Heavy Road Vehicles 总被引:5,自引:0,他引:5
David J. M. Sampson David Cebon 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2003,40(4):229-270
Summary Strategies are investigated for controlling active anti-roll systems in single unit heavy road vehicles, so as to maximise roll stability. The achievable roll stability improvements that can be obtained by applying active anti-roll torques to truck suspensions are discussed. Active roll control strategies are developed, based on linear quadratic controllers. It is shown that an effective controller can be designed using the LQG approach, combined with the loop transfer recovery method to ensure adequate stability margins. A roll controller is designed for a torsionally flexible single unit vehicle, and the vehicle response to steady-state and transient cornering manoeuvres is simulated. It is concluded that roll stability can be improved by between 26% and 46% depending on the manoeuvre. Handling stability is also improved significantly. 相似文献
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刚柔耦合多体车辆操纵稳定性研究 总被引:9,自引:3,他引:9
利用多体动力学方法建立了基于ADAMS软件平台的整车刚柔耦合多体系统操纵动力学仿真分析模型。并分别对多刚体模型和刚柔耦合多体模型进行了“转向盘脉冲输入”、“ISO移线”仿真,分析了构件的柔性对汽车操纵稳定性的评价指标值的影响。 相似文献