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1、Recent Developments in Automotive Differential DesignAthanassios Mihailidis and Ioannis NerantzisAbstract The current paper consists of two main parts: In the first, the evolution of passenger car differentials during th

2、e past twenty years of automotive design is presented. A short description on the features and principle of operation of each device is given. In the second part, a recent advance in differential design is presented. It

3、is a newly developed differential, designed to actively control the distribution of the driving torque to the wheels. The new device incorporates an electric machine, which can operate either as a motor or generator and

4、affects torque distribution to the vehicles driving wheels. The driving behavior of a vehicle equipped with the new differential was simulated in ADAMS/Car. Com- parative results were obtained using the following three t

5、ypes of differentials: an open differential, a limited slip differential and the new actively controlled device. Acceleration tests on road surface with different friction coefficient on each side of the vehicle for each

6、 differential type verified the accuracy of the simulation and verified that driving stability can be enhanced by actively controlled differentials.Keywords Differential ? Torque vectoring ? Torque sensing ? Active yaw1

7、IntroductionThe development and use of differential mechanisms starts form the ancient times and evolves in our days to the most complex driveline systems. Historical evidence for the existence of an early differential d

8、evice is the Antikythera mechanism (de Price 1974). The device is dated back to 80 BC and it derives from manyA. Mihailidis (&) ? I. Nerantzis Aristotle University of Thessaloniki, Thessaloniki, Greece e-mail: amih@a

9、uth.grI. Nerantzis e-mail: nerantzis@meng.auth.grG. Dobre (ed.), Power Transmissions, Mechanisms and Machine Science 13, DOI: 10.1007/978-94-007-6558-0_8, ? Springer Science+Business Media Dordrecht 2013125The Active Yaw

10、 Control system introduced by Mitsubishi was developedduring the 1990s. As seen in Fig. 3, it consists of a bevel gear differential, two multiple disk clutches and three gear pairs, which enable the alteration of speed o

11、f the clutch disks. This combination makes possible the distribution of torque to the driving wheels independently of their speed (Sawase and Sano 1999). In such systems the meaning of slip limiting is often confusing an

12、d therefore they are called torque proportioning or torque vectoring systems. In the last decade the term ‘‘torque vectoring’’ is used to describe the controllable torque distribution to the driving wheels of road vehicl

13、es. This is achieved with differentials similar to the two previously described in combination with an electronic system that monitors and logs the dynamic status of the vehicle and determines the desired torque for each

14、 wheel. Park and Kroppe (2004) describe a torque vectoring system whichFig. 1 Limited slip bevel gear differential (Hagiwara and Teraoka 1989)Fig. 2 Hydraulic CVT system used to control the torque distribution (Shibahata

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