Classification and analysis of lateral torque-vectoring differentials using velocity diagrams

Sawase, Kaoru; Inoue, Katsumi

doi:10.1243/09544070jauto824

Cited by 9 publications

(7 citation statements)

References 6 publications

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“…where K cvt is the gain value of the CVT ratio and the referenced CVT ratios are related to the steering angle. Also the gain values K cvt in both equation (12) and equation (13) are selected to be equal in order to maintain the symmetry of the driving behaviour of the vehicle. While cornering, a higher ratio slows the inside wheel, and a lower ratio speeds up the outside wheel to achieve the limited-slip differential function.…”

Section: Dual Continuously Variable Transmissionmentioning

confidence: 99%

See 1 more Smart Citation

Limited-slip and torque-vectoring effect of a dual continuously variable transmission

Chen

Huang

Yang³

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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This study investigates the limited-slip and steering characteristics of a dual continuously variable transmission system. The dual continuously variable transmission is a unique final drive system composed of two continuously variable transmissions, with one continuously variable transmission connected to each rear wheel. In this study, a dynamic model of the dual continuously variable transmission system is derived, and models of the conventional final drive systems, i.e. the solid axle and the open differential, are used as benchmarks. In the simulations, the dual continuously variable transmission model, the solid axle model and the open differential model are applied to a vehicle dynamic model for split-m road tests and a series of steering tests. According to the results of the split-m road tests, the limited-slip function of a dual continuously variable transmission system is verified. The results of the steering tests show that different torque distributions for the inside wheels and the outside wheels while cornering can be controlled with different gain values of the continuously variable transmissions; for this reason, the application of the dual continuously variable transmission system as a torque-vectoring device is proposed, and a basic setting principle is presented. The results of this study establish a fundamental knowledge for developing the dual continuously variable transmission as an advanced final system for improving the vehicle dynamics.

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Section: Dual Continuously Variable Transmissionmentioning

confidence: 99%

“…Mitsubishi S-AWC, Honda SH-AWD and ZF Torque Vectoring). Studies of the dynamics and control logic of TVDs have been previously reported, [3][4][5][6][7][8][9][10][11][12][13][14] and the principles of operation have already been explained in detail.…”

Section: Introductionmentioning

confidence: 99%

Limited-slip and torque-vectoring effect of a dual continuously variable transmission

Chen

Huang

Yang³

et al. 2016

Proceedings of the Institution of Mechanical Engineers, Part D:

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“…The TVD's theoretical energy loss E LOSS , which is generated by the slip clutch when a vehicle drives with S, is represented as [17] …”

Section: Maximum Acceptable Differential Speed Ratio Of Torque-vectormentioning

confidence: 99%

“…Because of its complicated structure, the operation and characteristics of these mechanisms are difficult to understand. Therefore, the present authors evaluated the characteristics, namely the output torques of the right and the left wheels, the clutch torque required to generate the output torque difference, the clutch slip speed, and the energy loss of TVD by applying the velocity diagram and concluded that TVDs are classified into seven kinds in total and that the TVD mechanisms adopted in the super AYC [15] are well balanced to reduce both the required clutch torque and the clutch slip speed [17]. In that analysis, the maximum acceptable differential speed ratio S max , which is defined as the differential speed ratio of TVD in the state when the differential speed of the slip clutch becomes zero, is introduced as a design parameter of the TVD.…”

Section: Introductionmentioning

confidence: 99%

Maximum acceptable differential speed ratio of lateral torque-vectoring differentials for vehicles

Sawase

Inoue

2009

Proceedings of the Institution of Mechanical Engineers, Part D:

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A lateral torque-vectoring differential consists of a slip clutch for torque vectoring from right to left, another slip clutch for torque vectoring from left to right, differential gears, and some planetary gears which generate the differential speeds of the slip clutches. The present authors introduced a design parameter, namely the maximum acceptable differential speed ratio, and showed that the design parameter is very useful to analyse the lateral torquevectoring differentials. The minimum of the design parameter is determined by the vehicle driving condition in which the torque-vectoring differential should be activated. In order to find the most appropriate value of the design parameter, this paper studies possible influences -namely the vehicle track, vehicle cornering radius, dynamic tyre radius difference between right and left wheels, lateral torque vectoring, and tyre-road friction characteristic -on the maximum acceptable differential speed ratio. As a result, the lateral torque vectoring and tyreroad friction characteristic should be considered as much as the vehicle track or cornering radius; meanwhile the dynamic tyre radius variation is negligible. Finally, a determination method for the maximum acceptable differential speed ratio is proposed.

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“…14 The application of a velocity diagram to a TVD was proposed by Sawase and Inoue. 15 The velocity diagram can easily represent the revolution speed and the torque relation of each gear, and then we can clearly understand the characteristics of the TVD. First, the definitions of the E-TVD in this paper are described.…”

Section: Introductionmentioning

confidence: 99%

Classification and analysis of electric-powered lateral torque-vectoring differentials

Kato

Sawase

2012

Proceedings of the Institution of Mechanical Engineers, Part D:

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An electric-powered lateral torque-vectoring differential utilizes the output torque of an electric motor for generating the torque difference between the right and the left wheels. Compared with conventional torque-vectoring differentials which utilize the slipping clutch or brake for torque vectoring, electric-powered lateral torque-vectoring differentials have advantages, namely the response and the control accuracy of the torque difference. However, an electric-powered lateral torque-vectoring differential is complex as it is composed of a single electric motor and some planetary gear units; therefore it is difficult to understand its mechanism and characteristics. This paper describes the classification and analysis of electric-powered lateral torque-vectoring differentials. Electric-powered lateral torque-vectoring differentials are studied using the velocity diagram which is utilized for analysis of the conventional torque-vectoring differentials. The analysis shows that the simplest electric-powered lateral torque-vectoring differential is a mechanism of five elements with two degrees of freedom; the mechanism is composed of a single electric motor, one differential gear unit and two planetary gear units; the gear ratios of the planetary gear units are equal to each other. The simplest mechanisms are classified into nine kinds and these have two differences in their characteristics, namely the torque amplification factor between the electric motor and the vectoring torque, and the revolution speeds of one rotational element. Finally, the best mechanism is evaluated from the differences of the characteristics.

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Classification and analysis of lateral torque-vectoring differentials using velocity diagrams

Cited by 9 publications

References 6 publications

Limited-slip and torque-vectoring effect of a dual continuously variable transmission

Limited-slip and torque-vectoring effect of a dual continuously variable transmission

Maximum acceptable differential speed ratio of lateral torque-vectoring differentials for vehicles

Classification and analysis of electric-powered lateral torque-vectoring differentials

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