共查询到19条相似文献,搜索用时 187 毫秒
1.
2.
3.
4.
5.
6.
7.
8.
9.
《世界汽车》2014,(11)
Q1:我对别克全新SUV昂科威非常感兴趣,听说它的四驱系统比较特别,请编辑老师介绍一下。
上海读者:杜天宇
A1:昂科威搭载的是适时四驱系统,提供两种不同版本供消费者选择,官方将两种四驱分别命名为“智能四驱”与“全路况智能四驱”,二者主要区别在于左右后轮动力分配。官方公布的资料显示,智能四驱主要会配备在精英版与豪华版车型上,其后桥配备一个多片离合器式限滑差速器,正常情况下以前驱为主,当系统监测到车轮打滑时,通过压紧离合器片将部分动力传递至后轮,以达到分配前后动力的目的。这套智能四驱系统的后桥限滑差速器装配在靠近左后轮的位置,在车轮不打滑时,后轮是不会获得任何动力的。由于是以前驱为主的四驱车型,如果两个前轮均处于打滑状态,车辆脱困则更多依靠车轮上的电子限滑辅助系统对车轮进行制动,从而达到脱困的效果。全路况智能四驱系统配备于旗舰版与运动旗舰版车型上,其与智能四驱系统主要区别在于它后桥上布置了两个多片离合器式限滑差速器,从前桥而来的动力可以通过两个限滑差速器按需分配给左右后轮,这样的方式无论在城市路面行驶还是在复杂路况下行驶时对车辆的行驶稳定性以及通过性都有很大的帮助。总体而言,昂科威的适时四驱系统结构并不算复杂,通过布置于后桥的多片离合器式限滑差速器达到分配后轮转矩的目的。 相似文献
上海读者:杜天宇
A1:昂科威搭载的是适时四驱系统,提供两种不同版本供消费者选择,官方将两种四驱分别命名为“智能四驱”与“全路况智能四驱”,二者主要区别在于左右后轮动力分配。官方公布的资料显示,智能四驱主要会配备在精英版与豪华版车型上,其后桥配备一个多片离合器式限滑差速器,正常情况下以前驱为主,当系统监测到车轮打滑时,通过压紧离合器片将部分动力传递至后轮,以达到分配前后动力的目的。这套智能四驱系统的后桥限滑差速器装配在靠近左后轮的位置,在车轮不打滑时,后轮是不会获得任何动力的。由于是以前驱为主的四驱车型,如果两个前轮均处于打滑状态,车辆脱困则更多依靠车轮上的电子限滑辅助系统对车轮进行制动,从而达到脱困的效果。全路况智能四驱系统配备于旗舰版与运动旗舰版车型上,其与智能四驱系统主要区别在于它后桥上布置了两个多片离合器式限滑差速器,从前桥而来的动力可以通过两个限滑差速器按需分配给左右后轮,这样的方式无论在城市路面行驶还是在复杂路况下行驶时对车辆的行驶稳定性以及通过性都有很大的帮助。总体而言,昂科威的适时四驱系统结构并不算复杂,通过布置于后桥的多片离合器式限滑差速器达到分配后轮转矩的目的。 相似文献
10.
11.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(11):1416-1442
In the motorsport environment, passive limited slip differentials are a well-established means of improving the traction limitation imposed by the open differential. Torque sensing types are highly adjustable, and can alter both the stability and agility of the vehicle in the various cornering phases of a typical manoeuvre. In this paper, an adjustable clutch plate or ‘Salisbury’ differential model is presented, which can significantly alter its torque bias characteristics through adjustments in the drive/coast ramp angle, the number of friction faces and preload. To allow robust evaluation of differential parameter changes on ultimate vehicle performance and handling balance, a unified acceleration or ‘GG’ diagram framework is then described. This builds on traditional GG diagram approaches, by using nonlinear constrained optimisation to define both the vehicle acceleration limits and a ‘feasibility’ region within the performance envelope. By linearising a seven degrees of freedom vehicle model at multiple operating points, eigenvalue and yaw rate response analysis is then used to establish contours of stability and agility throughout the GG envelope. This brings new insights into the way in which handling balance changes below and up to the vehicle's acceleration limits. 相似文献
12.
13.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(12):1772-1794
Modern motorsport limited slip differentials (LSD) have evolved to become highly adjustable, allowing the torque bias that they generate to be tuned in the corner entry, apex and corner exit phases of typical on-track manoeuvres. The task of finding the optimal torque bias profile under such varied vehicle conditions is complex. This paper presents a nonlinear optimal control method which is used to find the minimum time optimal torque bias profile through a lane change manoeuvre. The results are compared to traditional open and fully locked differential strategies, in addition to considering related vehicle stability and agility metrics. An investigation into how the optimal torque bias profile changes with reduced track-tyre friction is also included in the analysis. The optimal LSD profile was shown to give a performance gain over its locked differential counterpart in key areas of the manoeuvre where a quick direction change is required. The methodology proposed can be used to find both optimal passive LSD characteristics and as the basis of a semi-active LSD control algorithm. 相似文献
14.
电动轮驱动的汽车取消了机械式差速器后,在转向行驶、路面不平及车轮半径不等3种工况下,会出现差速问题。文章进行了实车转向行驶试验和车轮半径不等时的差速试验,验证了对电动轮电机控制按转矩模式控制而转速随动以实现自适应差速的控制策略。电动轮控制器可以实现很好的差速性能,说明采用转矩控制和转速随动的策略是解决汽车电子差速问题的前提和关键。 相似文献
15.
16.
《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(5):533-550
This paper presents a semi-active differential, magneto-rheological fluid limited slip differential, which allows us to bias the torque between the driving wheels. It is based on the magneto-rheological fluid employment, by which it is possible to change, in a controlled manner, the internal friction torque and, consequently, the torque bias ratio. This device is an adaptive one and allows us to obtain an asymmetric torque distribution in order to improve vehicle handling. The device modelling and the control algorithm, realised for this activity, are described. The illustrated results highlight the advantages that are attainable regarding directional behaviour, stability, and traction. 相似文献
17.
《JSAE Review》1994,15(3):209-214
A new limited slip differential was developed by Fuji Univance Corp. in co-operation with Automotive Products plc, which has a simple structure and applied special cams.The limited slip differential has a constant torque bias ratio regardless of the input torque. This paper presents its structure, principle of operation, analysis results of design parameters on the torque bias ratio characteristic, and experimental results. 相似文献
18.
本文中提出一种新型具备转矩定向分配功能差速器的集中式电驱动桥系统。该集中驱动系统可以在不改变总驱动转矩的条件下,类似分布式驱动方式实现驱动转矩在左右轮间的任意分配,从而产生改变车辆横摆动力学的直接横摆力偶矩。首先,分析了转矩定向分配差速器结构特点及其工作原理;其次,利用键合图理论建立了其动力学模型,并仿真分析了其动态响应特性;然后,设计了转矩响应控制系统以改善该差速器的动态性能;最后,嵌入整车模型进行了联合仿真。结果表明,装备该差速器的车辆可任意分配左右轮驱动转矩,并有效改善车辆操控特性。 相似文献
19.
Y. S. Pyoun H. T. Kim Y. C. Lee A. Gafurov H. Kim D. H. Jung 《International Journal of Automotive Technology》2008,9(1):61-70
Surface topology, cone angle and the forces acting on the cone of the clutch type limited slip differential (LSD) are major
design parameters for the bias ratio and the noise condition. Therefore much research has been dedicated to these developments
but the results have been used to submit patents. A new cone type limited slip differential for sport utility vehicles and
recreational vehicles, which has a very simple structure and easy compliance with the vehicle performance, has been developed
by the axiomatic approach and the ultrasonic nano crystal surface modification (UNSM) technology. The design criteria and
optimal value of the design parameters are determined by the axiomatic approach utilizing CAE tools. Test methodologies in
a test rig and in a vehicle were also developed. Test results showed good performance of bias ratio and noise level but durability
is still under testing. This study is an extension of F2006P266, FISITA 2006. 相似文献