SUV车辆差动制动防侧翻控制研究EI北大核心CSCD

建立了SUV车辆的线性侧翻预警与控制模型,利用CarSim进行了侧翻动力学的仿真分析。以前轮独立后轮低选控制的ABS为基础,运用最优控制原理设计了上层控制器得到最优横摆力矩,设计了差动制动协调器进行制动力分配和协调驾驶员的制动操作,与ABS下层控制器、执行器共同组成差动制动防侧翻控制系统。利用CarSim和Matlab/Simulink对控制系统进行了鱼钩转向试验联合仿真,结果表明,该控制系统方案可行,满足侧翻预警与控制的有效性和实时性的要求。     

SUV车辆差动制动防侧翻控制研究

建立了SUV车辆的线性侧翻预警与控制模型,利用CarSim进行了侧翻动力学的仿真分析。以前轮独立后轮低选控制的ABS为基础,运用最优控制原理设计了上层控制器得到最优横摆力矩,设计了差动制动协调器进行制动力分配和协调驾驶员的制动操作,与ABS下层控制器、执行器共同组成差动制动防侧翻控制系统。利用CarSim和Matlab/Simulink对控制系统进行了鱼钩转向试验联合仿真,结果表明,该控制系统方案可行,满足侧翻预警与控制的有效性和实时性的要求。     

基于底盘集成控制的轻型汽车防侧翻控制

提出了一种基于底盘集成控制的轻型汽车主动防侧翻控制系统。选取横向载荷转移率作为侧翻预警因子,并通过一3自由度侧翻参考模型进行实时计算。在此基础上,应用模型预测控制算法对主动转向和主动差动制动系统进行集成控制,提出了主动防侧翻控制算法。利用Matlab/Simulink与Carsim对车辆进行了典型工况的联合仿真。结果表明,所提出的主动防侧翻控制系统能准确预测车辆侧翻危险,避免侧翻事故发生,有效提高车辆综合行驶性能。     

基于模糊差动制动的运动型多功能汽车防侧翻控制

为了提高SUV高速紧急操纵下防侧翻性能,提出了基于模糊差动制动控制的防侧翻控制策略.研究中考虑轮胎非线性因素的影响,建立了4自由度非线性汽车侧翻模型,并通过横向载荷转移率负反馈设计了参数自整定的模糊PID控制器,以驱动电控机械制动系统(EMB)产生抗横摆力矩防止汽车侧翻.典型工况下的算例分析结果表明,该控制策略能充分发挥EMB响应快的特性,防止SUV高速紧急操纵下侧翻.     

客车预警防侧翻控制研究

客车车辆重心高、轮距窄,在紧急避让或高速超车易发生侧翻事故。建立三自由度名义模型,联立TruckSim非线性整车模型设计了基于横向动态载荷转移率预警系统和防侧翻系统,利用角阶跃工况联合仿真对设计系统进行验证。仿真结果表明:基于模糊PID控制能够有效改善客车行驶稳定性,降低客车侧翻风险。     

防抱死制动系统对SUV车辆操控稳定性仿真分析

针对SUV车辆在制动情况下出现的操纵性和稳定性变差现象,在CarSim软件中建立了SUV车辆动力学模型,在对开的路面对行驶的紧急制动工况进行了仿真,初步发现防抱死系统对该工况下车辆操纵稳定性的影响最大,为进一步验证,与Simulink结合建立了整车联合仿真模型,将Carsim中SUV制动过程中的制动压力导出至Simulink模型作制动仿真测试,进一步描绘出车轮侧偏角、横移角速度和偏移位移等影响操纵稳定性的参数数值变化曲线,通过分析对比,确定了紧急制动条件下为SUV车辆加装防抱死系统能达到提高操纵稳定性的目标,最终达到安全驾驶的目的。     

某混凝土搅拌车差动制动防侧翻控制仿真分析

针对混凝土搅拌运输车侧翻事故多发的现象,该文介绍了差动制动的防侧翻原理,基于ADAMS/Car建立了搅拌车的整车动力学模型,设计了针对搅拌车的差动制动防侧翻控制系统,并结合ADAMS/Car和Simulink建立了联合仿真试验模型,仿真试验结果表明,通过虚拟试验仿真可以合理的选择侧翻门限值,设计的差动制动防侧翻系统可以有效防止高速转向引起的车辆侧翻。     

A Research on Anti-Rollover Control for Vehicles with Semi-active Suspension

为利用半主动悬架阻尼连续可调的特性来提高汽车的主动安全性,建立了汽车侧翻预测模型,并以此为基础设计了一种双层结构的连续减振控制器,进行汽车防侧翻控制.上层控制器采用滑模控制方法输出期望侧倾力矩,下层控制器根据这个期望侧倾力矩,利用线性插值方法输出半主动悬架中各减振器的输入电流.利用MATLAB/Simulink对整个系统进行了仿真,结果表明,该控制器能有效提高汽车的防侧翻能力.     

基于主动横向稳定杆的汽车防侧翻控制

为了提高汽车转向时的侧向稳定性,建立了汽车三自由度侧翻模型,提出了主动横向稳定杆直接防侧翻力矩控制的汽车侧向稳定性控制方案。采用LQR最优控制算法,以侧向加速度、质心侧偏角和横向载荷转移率为综合控制对象,以主动横向稳定杆为执行机构,建立防侧翻控制系统,在Matlab/Simulink环境中对汽车进行阶跃转向侧翻仿真实验。仿真结果表明,基于主动横向稳定杆LQR控制系统能够及时在横向稳定杆上产生抗侧翻力矩,提高汽车的转向侧翻控制能力,减少侧翻事故的发生。     

基于新型磁流变阻尼器的汽车防侧翻研究

为提高车辆防侧翻性能，提出一种新型磁流变（MR）阻尼器，并对其蓄能器的弹性力进行了分析。在假设该MR阻尼器磁流变液（MRF）不可压缩，且在同一腔室内压力均匀分布的基础上，对其粘性力及受磁场强度控制的阻尼力进行推导分析，并仿真分析了MR阻尼器总阻尼力。最后，在CarSim中建立整车模型，在Simulink中通过PID控制进行联合仿真，结果表明，装备新型MR阻尼器的车辆可以在急转弯工况中使侧倾角减小近20%，在鱼钩试验工况中使轮胎最大垂直位移减小约50%，具有很好的防侧翻效果。     

Stability and optimised H∞ control of tripped and untripped vehicle rollover

Vehicle rollover is a serious traffic accident. In order to accurately evaluate the possibility of untripped and some special tripped vehicle rollovers, and to prevent vehicle rollover under unpredictable variations of parameters and harsh driving conditions, a new rollover index and an anti-roll control strategy are proposed in this paper. Taking deflections of steering and suspension induced by the roll at the axles into consideration, a six degrees of freedom dynamic model is established, including lateral, yaw, roll, and vertical motions of sprung and unsprung masses. From the vehicle dynamics theory, a new rollover index is developed to predict vehicle rollover risk under both untripped and special tripped situations. This new rollover index is validated by Carsim simulations. In addition, an H-infinity controller with electro hydraulic brake system is optimised by genetic algorithm to improve the anti-rollover performance of the vehicle. The stability and robustness of the active rollover prevention control system are analysed by some numerical simulations. The results show that the control system can improve the critical speed of vehicle rollover obviously, and has a good robustness for variations in the number of passengers and longitude position of the centre of gravity.     

基于主动转向技术的汽车防侧翻控制的研究

以汽车2自由度模型作为参考模型，建立了一种汽车防侧翻的控制方法。该方法采用主动转向技术来改变转向轮的转向角度，有效地减少了汽车的侧向加速度，提高了汽车的防侧翻的能力。在8自山度汽车动力学模型的基础上，运用主动转向技术的控制策略进行了汽车的性能仿真分析。与末采用汽车防侧翻控制系统的汽车动力学分析结果相比，汽车的主动安全性得到了增强。     

Effect of vertical and lateral coupling between tyre and road on vehicle rollover

The vehicle stability involves many aspects, such as the anti-rollover stability in extreme steering operations and the vehicle lateral stability in normal steering operations. The relationships between vehicle stabilities in extreme and normal circumstances obtain less attention according to the present research works. In this paper, the coupling interactions between vehicle anti-rollover and lateral stability, as well as the effect of road excitation, are taken into account on the vehicle rollover analysis. The results in this paper indicate that some parameters influence the different vehicle stabilities diversely or even contradictorily. And it has been found that there are contradictions between the vehicle rollover mitigation performance and the lateral stability. The direct cause for the contradiction is the lateral coupling between tyres and road. Tyres with high adhesion capacity imply that the vehicle possesses a high performance ability to keep driving direction, whereas the rollover risk of this vehicle increases due to the greater lateral force that tyres can provide. Furthermore, these contradictions are intensified indirectly by the vertical coupling between tyres and road. The excitation from road not only deteriorates the tyres’ adhesive condition, but also has a considerable effect on the rollover in some cases.     

基于目标速度的汽车ACC系统油门控制策略研究

ACC系统能够根据雷达等传感器检测到的前方车辆行驶信息,并自动控制本车的油门开度和制动强度,实现自适应巡航行驶,通过对车辆行驶纵向阻力特性的分析,针对目前广泛使用的基于目标加速度的油门开度控制策略受车辆装载质量影响较大的情况,利用功率平衡原理,提出了1种基于目标车速的油门开度控制策略,并利用PreScan软件对基于目标车速的油门开度控制策略进行了仿真实验,仿真结果表明了该控制策略有效的避免了整车装载质量变化对控制目标的影响。     

兼具馈能与主动抗侧倾功能的电控液压悬架系统设计与研究

为解决特种车辆或载重车辆在极端工况下易侧翻的问题,提出了一种兼具馈能与主动抗侧倾功能的电控液压悬架系统。对该悬架系统的主动抗侧倾模式和馈能模式进行了功能原理设计与分析;针对主动抗侧倾模式与馈能模式,构建了电液悬架系统仿真模型;设计了电液悬架系统主动抗侧倾模糊PID控制策略和侧倾力矩分配方案,以及执行机构逻辑门限值控制策略,并基于Matlab/Simulink、TruckSim和AMESim仿真软件,搭建了电液悬架系统主动抗侧倾控制策略联合仿真平台;对装配有电液悬架系统的车辆模型在极限工况下的抗侧倾性能进行仿真分析,并对车辆在随机路面激励输入下的馈能特性进行仿真分析。结果表明,装配该电液悬架的特种车辆具备较强的防侧翻能力,并具有较好的悬架运动能量回收潜力。     

碰撞试验中侧气囊对假人头胸部的保护效果

侧面安全气囊和气帘是专门针对乘员进行保护的安全装置,在发生侧面碰撞的交通事故中能有效地减少乘员受伤害的程度.文章从2013年在国家轿车质量监督检验中心进行的,依据GB 20071-2006《汽车侧面碰撞的乘员保护》进行的侧面碰撞试验中,选取了10个车型,包括轿车和SUV,每个车型分别进行了有侧面安全气囊、气帘和没有侧面安全气囊的侧面碰撞试验,结果表明配备侧面气囊和气帘的汽车能对乘员头部和上部肋骨提供更好的保护,但对中部和下部肋骨的保护效果一般,可以看出侧面气囊和气帘能对乘员头胸部提供更好的保护.     

An improvement in rollover detection of articulated vehicles using the grey system theory

A Rollover Index combined with the grey system theory, called a Grey Rollover Index (GRI), is proposed to assess the rollover threat for articulated vehicles with a tractor–semitrailer combination. This index can predict future trends of vehicle dynamics based on current vehicle motion; thus, it is suitable for vehicle-rollover detection. Two difficulties are encountered when applying the GRI for rollover detection. The first difficulty is effectively predicting the rollover threat of the vehicles, and the second difficulty is achieving a definite definition of the real rollover timing of a vehicle. The following methods are used to resolve these problems. First, a nonlinear mathematical model is constructed to accurately describe the vehicle dynamics of articulated vehicles. This model is combined with the GRI to predict rollover propensity. Finally, TruckSim^? software is used to determine the real rollover timing and facilitate the accurate supply of information to the rollover detection system through the GRI. This index is used to verify the simulation based on the common manoeuvres that cause rollover accidents to reduce the occurrence of false signals and effectively increase the efficiency of the rollover detection system.     

一种智能四驱控制的CRUISE仿真及应用

智能四驱是目前SUV车型发展的趋势,如何对该整车模型建模及性能仿真显得尤其重要。文章根据一款SUV车型物理结构及所采用的控制策略进行分析,采用CRUISE软件搭建整车性能仿真模型,并通过试验结果对其动力性经济性进行验证。表明,常用工况中,智能四驱仿真结果与两驱模式下性能基本一致,提供了一种比较行之有效的整车性能匹配的分析方法。     

Development of an electric active rollcontrol (ARC) algorithm for a SUV

Cornering maneuvers with reduced body roll and without loss in comfort are leading requirements for car manufacturers. An electric active roll control (ARC) system controls body roll angle with motor-driven actuators installed in the centers of the front and rear stabilizer bars. A vehicle analysis model developed using a CarSim S/W was validated using vehicle test data. Two ARC algorithms for a sports utility vehicle (SUV) were designed using a sliding-mode control algorithm based on a nonlinear roll model and an estimated lateral acceleration based on a linearized roll model. Co-simulation with the Matlab simulink controller model and the CarSim vehicle model were conducted to evaluate the performance of two ARC control algorithms. To validate the ARC performance in a real vehicle, vehicle tests were conducted at KATECH proving ground using a small SUV equipped with two ARC actuators, upper and lower controllers and a few subsystems. From the simulation and vehicle validation test results, the proposed ARC control algorithm for the developed ARC actuator prototypes improves the vehicle’s dynamic performance.     

北汽自我救赎

这是一家在中国汽车发展史留下浓彩重墨的企业：几乎与一汽同时推出中国最早的自主品牌轿车;自主研发的多款轻卡车填补中国汽车工业的空白;生产的吉普车曾风靡大江南北。作为县团级官员的标准坐驾;建立了中国最早的中外合资企业,其产品一度垄断了高端越野车市场……然而。这样一家在中国汽车行业举足轻重的企业,在上世纪九十年代中期,却渐渐失去了光彩。近几年。一场加速内部资源整合,实现公司国际化战略的“战役”,在这家企业悄然拉开帷幕。