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根据驱动方式的不同,车桥也分成转向桥、驱动桥、转向驱动桥和支持桥四种。其中转向桥和支持桥都属于从动桥。大多数汽车采用前置后驱动(FR),因此前桥作为转向桥,后桥作为驱动桥;而前置前驱动(FF)汽车则前桥成为转向驱动桥,后桥充当支持桥。本文主要对车桥的组成及工作原理进行分析。 相似文献
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专用夹具是根据零件机械加工工艺过程中某一工序而专门设计的。由于不考虑通用性,故结构紧凑、操作方便,可以保证较高的加工精度和劳动生产率。文中根据某国产超重型越野车前桥转向横拉杆臂零件回转面的技术要求和加工生产的技术条件,拟定合理的工艺方法和工艺规程,完成专用夹具设计。 相似文献
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专用夹具是根据零件机械加工工艺过程中某一工序而专门设计的.由于不考虑通用性,故结构紧凑、操作方便,可以保证较高的加工精度和劳动生产率.文中根据某国产超重型越野车前桥转向横拉杆臂零件回转面的技术要求和加工生产的技术条件,拟定合理的工艺方法和工艺规程,完成专用夹具设计. 相似文献
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为了保证汽车直线行驶的稳定性，转向轻便性和减少轮胎和机件的磨损，在汽车的转向轮上设计有车轮定位，它包括主销后倾、主销内倾、前轮外倾和前轮前束。早期汽车的前轮定价中只有前轮前束可以调整，其它则设计成不可调式。现在随着各种新结构的不断应用，不仅前桥采用了独立悬架，而且后桥大部分也采用了独立悬架以及后轮定位。为进一步提高汽车操纵稳定性和降低轮胎与机件的磨损，四轮定位的检测与调整显得日益重要。本文仅就四轮定位的调整谈谈现代轿车中常采用的方法。 相似文献
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阳义 《科技成果管理与研究》2011,(8):73-74
汽车振动是舒适性评价的重要指标之一,它与很多因素有关,除悬架、轮胎、座椅等部件外,转向系统的振动也直接影响汽车的舒适性,文章对汽车转向系统前轴的侧倾振动、前轮绕主销的摆振和外界激振进行了的简单分析。 相似文献
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《Journal of The Franklin Institute》2018,355(18):9321-9350
This paper simultaneously addresses the parameter/state uncertainties, external disturbances, input saturations, and actuator faults in the handling and stability control for four-wheel independently actuated (FWIA) electric ground vehicles (EGVs). Considering the high cost of the available sensors for vehicle lateral velocity measurement, a robust H∞ dynamic output-feedback controller is designed to control the vehicle motion without using the lateral velocity information. The investigated parameter/state uncertainties include the tire cornering stiffness, vehicle mass, and vehicle longitudinal velocity. The unmodeled terms in the vehicle lateral dynamics model are dealt as the external disturbances. Faults of the active steering system and in-wheel motors can cause dangerous consequences for driving, and are considered in the control design. Input saturation issues for the tire forces can deteriorate the control effects, and are handled by the proposed strategy. Integrated control with active front steering (AFS) and direct yaw moment (DYC) is adopted to control the vehicle yaw rate and sideslip angle simultaneously. Simulation results based on a high-fidelity and full-car model via CarSim-Simulink show the effectiveness of the proposed control approach. 相似文献
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Biao Ma Yulong Liu Xiaoxiang Na Yahui Liu Yiyong Yang 《Journal of The Franklin Institute》2019,356(8):4397-4419
Shared control structure is beneficial to steering controller design of intelligence vehicles, and human-machine goal consistency is a key prerequisite for shared control. However, the goal consistency is usually given and cannot be changed, and the steering controller in low goal consistency, which directly affect the vehicle performance in case of emergency, has not been sufficiently investigated. This paper proposes a shared steering controller for path-following task based on Nash game strategy and steer-by-wire system considering different human-machine goal consistency. The driver-automation interactive path-following task is modeled by non-cooperative MPC, and authority weight of lateral displacement is used to balance the control objectives of the driver and automation. Human-machine goal consistency is determined by the driver and the automation controller steering angle. Aimed at different goal consistencies, a continuous authority weight adjustment algorithm is designed to ensure correct path following. This is especially true in low consistency in this study, when four driving modes are given to meet the different demand for control power. Simulations and hard-in-loop tests are conducted to verify the proposed control algorithm and the results show that it can perform the path-following task irrespective of human-machine goal consistency. 相似文献
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《Journal of The Franklin Institute》2022,359(16):8713-8741
In this paper, the optimal driving torques of four wheels in an electric vehicle (EV) are obtained by minimizing the losses of four in-wheel motors. In order to slightly change these optimal torques for vehicle stability recovery, a new constrained active front steering (AFS) system is analytically designed and integrated with the torque vectoring (TV) system in a novel decentralized structure. In the proposed structure, the required external yaw moment is applied by the TV controller only when the constrained AFS is filled to capacity determined by a stability index extracted from the nonlinear phase plane analysis. As a result of this integration strategy, the external yaw moment is used as low as possible. Consequently, the torques in electrical motors are used near the optimal values consistent with optimal energy consumption. Comparative simulation studies with the standalone TV are conducted in the CarSim software environment to show the efficiency of the proposed decentralized control structure in terms of energy consumption and stability. Moreover, the suitability of the constrained control method used in the integration structure is shown in comparison with the well-known nonlinear model predictive control method in terms of practical implementation. 相似文献
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运用软件Solidworks建立汽车后桥壳的三维模型,并利用有限元分析软件COSMOSWorks对该后桥壳进行静态受力分析,获取该零件的应力分布云图,从而为零件的合理设计提供有价值的参考。 相似文献
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促进新能源汽车产业供需双侧政策与政府采购、商业运营和私人乘用三类异质性市场之间的良性互动和合理配置,这是我国新能源汽车产业发展过程中亟待解决的现实难题。从政府采购、商业运营和私人乘用三类异质性市场比较的视角,利用面板数据回归和面板分位数回归分析了供需双侧政策对新能源汽车需求市场培育激励效应的差异性及其产生的原因。研究结果表明,三类异质性市场由于形成原因和目标消费群体的不同表现出不同的发展潜力,呈现交替发展的态势;供需双侧政策对于三类异质性市场的作用效果具有差异性,并且需求侧相比供给侧政策的作用效果更为显著。新能源汽车供需双侧政策的激励效果随着政府采购、商业运营和私人乘用三类异质性市场规模变化而呈现出差异性。新能源汽车产业政策制定时应充分考虑政策实施效果的市场异质性性和规模差异性,有针对地实施差异化的扶持政策。 相似文献
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汽车操纵稳定性是汽车的重要性能之一,然而多数关于汽车操纵稳定性的仿真都是基于汽车开路系统的仿真,如何将驾驶员的意识反馈到汽车的操纵特性上,形成人—汽车闭路系统的仿真还很少涉及。根据多体动力学理论基础,应用多体系统动力学仿真分析软件SIMPACK建立了汽车的整车模型,将驾驶员前方预描距离作为控制参数输入到转向操纵系统中,进而形成人—汽车闭路系统的仿真。最后将有预描距离和无预描距离作比较,得出驾驶员视野前方的预描距离对汽车的操纵稳定性起着很大的影响。 相似文献
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介绍了基于GPS技术的车辆监控系统原理,讨论了系统中软件架构的设计原则和实现思路。车辆监控系统由车辆调度中心、无线通信网络和车载设备组成。软件架构设计包括架构的选型和相关技术的运用,并详细讨论了通信平台的设计。 相似文献
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《Journal of The Franklin Institute》2022,359(6):2487-2513
To improve the path tracking control performance of the intelligent vehicle under critical maneuvers, a novel control strategy is introduced in this work. Considering that the tire cornering characteristics show high nonlinearities and uncertainties under those special driving conditions, a three-dimensional piecewise affine (PWA) identification method is proposed to realize the nonlinear modeling of the tire cornering characteristics for the first time. On this basis, the PWA model of the vehicle lateral dynamics is established. To obtain the vehicle target yaw rate for path tracking, a driver direction control model with adaptive preview time is put forward. Then, the linear quadratic optimal control method is further adopted to design multiple path tracking controllers for different working areas of the affine subsystems, thus the optimal steering angles of the front wheels can be generated to guarantee the path tracking performance for the intelligent vehicle under a wide range of driving conditions. Finally, to evaluate the performance of the proposed path tracking control strategy which considers the tire nonlinear cornering characteristics in the PWA form, the CarSim-Simulink co-simulation work is conducted. The co-simulation results show that the proposed control strategy presents significant performance advantages over the other two methodologies and demonstrates satisfactory path tracking control performance. 相似文献