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汽车底盘的技术状况关系到整车的行驶操纵稳定性和安全性,同时还影响发动机的动力传递和燃油消耗。汽车底盘测功机是能对与汽车的动力性、经济性、操纵性和安全性有关的参数进行检测、分析和判断的室内检测设备。 相似文献
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机械变速器,尤其是多棣位机械变速器的操纵品质,对汽车动力性和燃油经济性、行驶安全性,乘员舒适性和汽车使用寿命等影响很。用电子控制自动操纵来代替传统的手工操纵,能使上述指标达到最理想的状态。 相似文献
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江淮牌HF131、HFD131型3吨载货汽车是合肥江淮汽车制造厂的更新换代产品。分别装用新型汽油发动机和柴油发动机以及新型驾驶室。整车的燃油经济性、动力性和操纵稳定性均有提高;同时又继承原有底盘 相似文献
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汽车性能及技术状况对高速公路行车安全的影响 总被引:1,自引:0,他引:1
探讨了人、车、路与环境交通安全系统中车的影响因素 ,主要分析了汽车的操纵稳定性和制动性对车辆行驶安全性的影响 ,同时探讨了在高速行驶过程中发动机和底盘的技术状况对交通安全的影响。 相似文献
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近年来随着汽车保有量增加,道路交通安全问题已逐渐成为世界性的难题。许多国家通过立法对汽车行驶安全性提出越来越严格的要求,并强制安装一些底盘稳定性电子控制装置。论文基于车辆制动性能和操纵稳定性能对国内外车辆行驶安全性法规确定的试验方法和评价指标研究进展进行了对比综述,对于进一步完善和实现汽车性能测试、提高我国车辆底盘控制系统自主开发能力、健全国内车辆主动安全性法规等具有一定的积极意义。 相似文献
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Downhill Assist Control Method for Hybrid Electric Vehicle 总被引:1,自引:0,他引:1
为提高混合动力汽车(HEV)下坡过程中的安全性和燃油经济性,基于HEV电机制动力矩可精确调节、制动能量可回收的特点,提出了一种下坡主动安全控制方法.结合对驾驶员坡道驾驶意图的识别,建立分层控制系统架构;根据目标车速计算制动力矩,制定制动力矩在各制动子系统间的分配和动态协调策略,并进行仿真验证.结果表明,该方法在提高下坡路段HEV行驶安全性和燃油经济性的同时,减轻了驾驶员的操纵负担,改善了乘员的乘坐舒适性. 相似文献
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应用参数灵敏度分析了城市公交汽车在实际行驶过程中,行驶车速、载重量、道路阻力系数等运行参数对汽车燃油经济性的影响程度。分析表明:道路阻力因数波动对汽车油耗的影响最大,其次是实际载重量和行驶车速。选择子午线轮胎来降低滚动阻力系数或者选择较为平坦的路面行驶能够有效降低燃油的消耗;行驶速度越大,对汽车燃油经济性影响也越明显,在高速情况下应该尽量减少速度的波动。 相似文献
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汽车转向系统除了基本的转向功能外,还要满足其它各种功能的需求。比如操纵稳定性、NVH、燃油经济性、碰撞性能、轻量化及其它功能。操纵稳定性是评价汽车安全驾驶的主要指标;文章主要论述了汽车操作稳定性的影响因素及主客观评价,并通过不同测试操作进行相应测评。 相似文献
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汽车悬架特性检测设备的结构原理及选用 总被引:2,自引:0,他引:2
悬架装置是保证汽车行驶平顺性的重要总成。它的主要功能是:缓和由路面不平引起的振动和冲击,以保证汽车具有良好的行驶平顺性;迅速衰减车身和车桥的振动;传递作用在车轮和车身之间的各种力和力矩。同时,汽车悬架装置对汽车的安全性、操纵稳定性、通过性和汽车燃料经济性等都有影响。 相似文献
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随着车辆控制技术的发展,电控空气悬架系统逐步取代了传统空气悬架.文章介绍了电控空气悬架系统的结构组成及其功能特点,概述了国内外电控空气悬架的发展情况,简要分析了其发展趋势.与传统弹簧悬架相比,电控空气悬架系统具有较优越的动态传递特性,能降低车轮与路面之间的相对动载,减少汽车对路面的冲击损坏,较好地改善汽车的行驶平顺性和操纵稳定性. 相似文献
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提升桥的使用,可减轻车辆的自重,降低油耗,减少轮胎的磨损,能为用户带来良好的经济效益。由于通过气囊将提升桥提升,气囊具有良好的非线性弹性特性,用于车辆悬架装置中可以明显改善车辆的操纵稳定性和行驶平顺性,同时可以减轻重载车辆对路面的破坏,在重卡上得到广泛的应用。本文对提升桥悬架结构形式进行简述,对比分析了目前几种提升桥控制系统各自优缺点。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(4):568-586
In the last few years, various control systems have been investigated in the automotive field with the aim of increasing the level of safety and stability, avoid roll-over, and customise handling characteristics. One critical issue connected with their integration is the lack of state and parameter information. As an example, vehicle handling depends to a large extent on tyre inflation pressure. When inflation pressure drops, handling and comfort performance generally deteriorate. In addition, it results in an increase in fuel consumption and in a decrease in lifetime. Therefore, it is important to keep tyres within the normal inflation pressure range. This paper introduces a model-based approach to estimate online tyre inflation pressure. First, basic vertical dynamic modelling of the vehicle is discussed. Then, a parameter estimation framework for dynamic analysis is presented. Several important vehicle parameters including tyre inflation pressure can be estimated using the estimated states. This method aims to work during normal driving using information from standard sensors only. On the one hand, the driver is informed about the inflation pressure and he is warned for sudden changes. On the other hand, accurate estimation of the vehicle states is available as possible input to onboard control systems. 相似文献
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In this study, cooperative regenerative braking control of front-wheel-drive hybrid electric vehicle is proposed to recover optimal braking energy while guaranteeing the vehicle lateral stability. In front-wheel-drive hybrid electric vehicle, excessive regenerative braking for recuperation of the maximum braking energy can cause under-steer problem. This is due to the fact that the resultant lateral force on front tire saturates and starts to decrease. Therefore, cost function with constraints is newly defined to determine optimum distribution of brake torques including the regenerative brake torque for improving the braking energy recovery as well as the vehicle lateral stability. This cost function includes trade-off relation of two objectives. The physical meaning of first objective of cost function is to maximize the regenerative brake torque for improving the fuel economy and that of second objective is to increase the mechanical-friction brake torques at rear wheels rather than regenerative brake torque at front wheels for preventing front tire saturation. And weighting factor in cost function is also proposed as a function of under-steer index representing current state of the vehicle lateral motion in order to generalize the constrained optimization problem including both normal and severe cornering situation. For example, as the vehicle approaches its handling limits, adaptation of weighting factor is possible to prioritize front tire saturation over increasing the recuperation of braking energy for driver safety and vehicle lateral stability. Finally, computer simulation of closed loop driver-vehicle system based on Carsim? performed to verify the effectiveness of adaptation method in proposed controller and the vehicle performance of the proposed controller in comparison with the conventional controller for only considering the vehicle lateral stability. Simulation results indicate that the proposed controller improved the performance of braking energy recovery as well as guaranteed the vehicle lateral stability similar to the conventional controller. 相似文献
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