共查询到19条相似文献,搜索用时 234 毫秒
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通过对各种四轮驱动系统的的分析,说明智能四驱系统是将来的发展方向。在ADAMS/View里建立整车模型和动力控制系统,完成对各种四驱系统的仿真,并对仿真结果作了比较,证明了智能四驱系统的优越性。 相似文献
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汽车在高速行驶中的经济性和稳定性与汽车受到的空气阻力和升力直接相关。与传统燃油车相比,降低风阻对于电动汽车提升续航里程和降低能耗更加重要。本文中采用雷诺时均方法对某款纯电动SUV车型进行在120 km/h车速下整车外流场仿真分析,并将风阻系数和升力系数与等比例油泥模型风洞试验的结果进行了对比。采用常用的Realizable k-ε湍流模型对该SUV车型后扰流板进行仿真优化。研究了该SUV的后扰流板上表面不同倾斜角度对整车气动升力和阻力系数的影响;进一步,在最佳倾角的基础上,通过5种后扰流板通孔形式的对比分析,确定了最优状态的后扰流板。最终的验证试验结果表明,整车风阻系数降低3.9%,而升力系数的增加在可接受范围内。 相似文献
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为了在设计阶段保证整车的NVH性能,通过搭建虚拟路面仿真平台探究轮胎关键物理参数对于整车路面振动噪声的影响规律。结合实车采集的试验场NVH路面PSD、高精度物理轮胎CDTire模型以及整车声固耦合模型,建立完整的整车路噪仿真环境。通过某款SUV的仿真结果表明,不同款轮胎及同款轮胎不同批次对整车路面振动噪声有直接的影响。虚拟路面方法可以在整车开发早期甄别出在车辆噪声中起主导作用的频率段,从而排查明显的NVH设计缺陷,同时,可以为车型NVH正向开发提供轮胎选型依据。 相似文献
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某整车生产企业需要对某燃油SUV车型进行换代升级,新车型需要在纯电动、增程式、混联式混合动力系统中选择合适的类型与参数作为新车型采用的动力系统。针对这一问题,通过计算得到动力系统的功率与扭矩的需求指标,并结合供应商资源对不同动力系统的具体参数进行选择确定。通过cruise软件搭建整车仿真计算模型,并建立相应的纯电动、增程式车型的控制策略、确定减速器速比,最后对整车搭载不同动力系统时的动力性、经济性进行计算分析。结果表明,该车型搭载纯电动动力系统时的能源消耗费用最低,搭载增程式动力系统能够大幅提高燃油经济性,搭载混联式混合动力系统能够获得最好的整车动力性与燃油经济性。其结果对同类车型动力系统类型的匹配、选择提供了参考和依据。 相似文献
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一提到四驱,很多人会想到SUV,其实当四驱系统应用于轿车上时,同时会让主动安全性得到质的提升。一贯生产SUV车型的铃木深谙此道,所生产的第一款中级轿车凯泽西便打出了四驱牌。 相似文献
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J. Kim 《International Journal of Automotive Technology》2016,17(2):319-326
In this paper, the optimal power distribution of the front and rear motors for minimizing energy consumption of a 4WD EV is investigated. An optimal power distribution control is developed based on the mathematical energy consumption model of an EV. The objective function is defined while ignoring time. And, the time effect is applied by considering the objective function for every single driving point which consists of the vehicle driving force and velocity. From the optimization problem, the optimal torque distribution maps of the front and rear motors can be obtained for all vehicle driving force and velocity ranges. These maps can be expressed using a 3-dimensional map. If the vehicle driving force and velocity are determined, the optimal front and rear motor torques can be determined using these maps. These maps can distribute the front and rear motor torques for the entire velocity range. Thus, these maps can perform the optimal power (torque times speed) distribution of the front and rear motors for minimizing the energy consumption of the 4WD EV. The performance of the optimal power distribution is evaluated by comparing the energy consumption to that of simple power distribution control. For obtaining the energy consumption, a vehicle driving simulation is performed. For the simulation, the driving cycle is required, and the NEDC (New European Driving Cycle) is used. From the simulation results, it is found that the energy consumption of simple power distribution is 4.8 % larger than the optimal one. Thus, the optimal power distribution can minimize the 4WD EV energy consumption as the optimization objective function. 相似文献
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Penglei Dai Jay Katupitiya 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2018,56(11):1682-1716
The aim of this paper is to present a novel control method for a four-wheel steer and four-wheel drive (4WS4WD) vehicle. The novelty is in the integration of sliding mode control (SMC) and particle swarm optimization (PSO) that is proposed to solve the control problem caused by the nonlinear, highly coupled and over-actuated characteristics of the four-wheel steer and four-wheel drive (4WS4WD) vehicle. The validity of the control method is evaluated by two criterions, namely path following performance assessed by the vehicle's position errors with respect to the reference path, and motion quality reflected by the smoothness of vehicle's velocities and accelerations. In vehicle modelling, a kinematic model and a dynamic model considering all slip forces are proposed for the controller design. Simulation results are provided to demonstrate the applicability of the proposed methodology and its robustness. 相似文献
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K. Jeon H. Hwang S. Choi J. Kim K. Jang K. Yi 《International Journal of Automotive Technology》2012,13(2):247-253
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. 相似文献
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采用自然坐标系下的整车动力学模型,模拟变速或转向过程中可能存在的变化情况,进行了四电动轮独立驱动的电动汽车仿真。仿真试验表明,在变速或转向的过程中,各轮的输出转矩可能会有较大差异。因此在此类电动汽车的设计中应当充分考虑对变速或转向时各轮的转矩加以控制,以提高操控性能。 相似文献
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