Torque-Fill Control and Energy Management for a Four-Wheel-Drive Electric Vehicle Layout With Two-Speed Transmissions

Pinto, Stefano De; Camocardi, Pablo; Sorniotti, Aldo; Gruber, Patrick; Perlo, Pietro; Viotto, Fabio

doi:10.1109/tia.2016.2616322

Cited by 52 publications

(42 citation statements)

References 16 publications

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“…An electro-mechanical EM gear selector (EM-S in Figure 1d), based on a dog-clutch coupling, is used for the selection of the first EM gear, second EM gear and EM neutral gear (N). Since the synchronisation process for the EM gear shifts can be implemented through the EM torque to control the EM speed in closed-loop during the inertia phase (see a similar controller in De Pinto et al [16]), a mechanical synchroniser is not needed.…”

Section: Case Study Vehicle and Transmissionsmentioning

confidence: 99%

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On the Energy Efficiency of Dual Clutch Transmissions and Automated Manual Transmissions

et al. 2017

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Abstract:The main benefits of dual clutch transmissions (DCTs) are: (i) a higher energy efficiency than automatic transmission systems with torque converters; and (ii) the capability to fill the torque gap during gear shifts to allow seamless longitudinal acceleration profiles. Therefore, DCTs are viable alternatives to automated manual transmissions (AMTs). For vehicles equipped with engines that can generate considerable torque, large clutch-slip energy losses occur during power-on gear shifts and, as a result, DCTs need wet clutches for effective heat dissipation. This requirement substantially reduces DCT efficiency because of the churning and ancillary power dissipations associated with the wet clutch pack. To the knowledge of the authors, this study is the first to analyse the detailed power loss contributions of a DCT with wet clutches, and their relative significance along a set of driving cycles. Based on these results, a novel hybridised AMT (HAMT) with a single dry clutch and an electric motor is proposed for the same vehicle. The HAMT architecture combines the high mechanical efficiency typical of AMTs with a single dry clutch, with the torque-fill capability and operational flexibility allowed by the electric motor. The measured efficiency maps of a case study DCT and HAMT are compared. This is then complemented by the analysis of the respective fuel consumption along the driving cycles, which is simulated with an experimentally validated vehicle model. In its internal combustion engine mode, the HAMT reduces fuel consumption by >9% with respect to the DCT.

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Section: Case Study Vehicle and Transmissionsmentioning

confidence: 99%

“…The mathematical description of the HAMT torque-fill function is provided by Gavgani et al [18,19], including gearshift simulations and experiments. De Pinto et al [16] present torque-fill controllers in electrified drivetrains, including gearshift performance indicators calculated during experimental gearshifts without and with EM torque-fill. …”

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confidence: 99%

On the Energy Efficiency of Dual Clutch Transmissions and Automated Manual Transmissions

et al. 2017

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“…At present, the main control method is based on the acceleration pedal and feedback signal of each wheel's speed. Combined with the steering wheel rotation angle and the speed relation of each driving wheel, the control instruction is sent to the driving motor through comprehensive analysis and calculation by the differential control of two-side driven wheels [6]. However, this method is mostly based on the Ackerman steering model, which ignores the characteristics of nonlinear system, which causes errors between the model and the actual vehicle.…”

Section: Introductionmentioning

confidence: 99%

Adaptive electronic differential control of vehicle by torque balance

Hong

Zhu²,

Wang

2019

Mobile Netw Appl

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Current adaptive torque balancing control of electric wheel-driven vehicle has shortcomings in electronic differential control of drive motor by using rotation speed mode. In order to solve this problem, an adaptive electronic differential control method of electric wheel-driven vehicle is proposed in this paper by torque balance. Firstly, by starting from the kinematics and dynamics of vehicle steering, the speed and force of each drived wheel in the steering are analyzed to explain the auxiliary role of electronic differential control to adaptive torque balancing, as well as influence of steering radius in vehicle. Then, electronic differential distribution by torque of wheel is used to control the abnormal jump interference and calculate the optimal combination of parameters in electronic differential control system. Finally, based on the optimal combination of these parameters, an adaptive electronic differential control of electric wheel-driven vehicle by torque balance is realized with fuzzy control in active and the reactive power. Experimental results show that the proposed method suppresses the abnormal jump interference factors of electronic differential control, as well as realizes the differential functions in control system. It has far-reaching significance by provideing a basic guarantee to realize adaptive electronic differential control system in electronic wheel-driven vehicle.

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“…Most general designs consist of two pairs of gearsets in different speed ratios, and utilize clutches, brakes, or motors to control the direction of the transferred wheel torque [10][11][12][13][14]. However, the two pairs of gearsets or motors in current designs result in heavier system weight and larger space requirements.…”

Section: Introductionmentioning

confidence: 99%

Design and Analysis of a New Torque Vectoring System with a Ravigneaux Gearset for Vehicle Applications

Chen

Chang

et al. 2017

Energies

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Abstract:The purpose of this research is to develop a new torque vectoring differential (TVD) for vehicle applications and investigate its effect on vehicle dynamic control. TVD is a technology that is able to distribute the engine torque to the left and right driving wheels at different ratios so that the yaw motion control can be realized. Attention has been paid to this technology in recent years because of its potential to improve the vehicle performance and driving safety. In this study, a new TVD design with a Ravigneaux gearset was developed. This new design is able to use only one pair of gearsets to generate two different speed ratios, and the weight and volume of the system can be reduced. To execute the research, current TVD designs were analyzed and their design principles were clarified. Next, a new TVD design with Ravigneaux gearset was proposed. Then the connecting manner and the gear ratio of the Ravigneaux gearset were discussed. The dynamic equation of the system was then derived and the operation of the system was simulated in a MATLAB program. Further simulation was performed with a vehicle dynamic model in SimulationX to demonstrate the effect of the new system. The results of this study show the potential of building a new TVD with a Ravigneaux gearset and can be helpful for further system development.

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Torque-Fill Control and Energy Management for a Four-Wheel-Drive Electric Vehicle Layout With Two-Speed Transmissions

Cited by 52 publications

References 16 publications

On the Energy Efficiency of Dual Clutch Transmissions and Automated Manual Transmissions

On the Energy Efficiency of Dual Clutch Transmissions and Automated Manual Transmissions

Adaptive electronic differential control of vehicle by torque balance

Design and Analysis of a New Torque Vectoring System with a Ravigneaux Gearset for Vehicle Applications

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