Dynamics and Control of Clutchless Automated Manual Transmissions for Electric Vehicles

Walker, Paul; Fang, Yuhong; Zhang, Nong

doi:10.1115/1.4036928

Cited by 40 publications

(22 citation statements)

References 29 publications

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“…With the increase of environmental pollution, the electric vehicles have attracted extensive attention owe to their advantages of zero emissions. When developing the transmission system of electric vehicles, high efficiency and low cost are two key points that should be taken into consideration [1].…”

Section: Introductionmentioning

confidence: 99%

Variable Weight Coefficient Optimization of Gearshift Actuator With Direct-Driving Automated Transmission

Zhang

et al. 2020

IEEE Access

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Direct-Driving Automated Mechanical Transmission (DAMT) gearshift actuator is a kind of electromagnetic linear actuator. In practical application, the actual gearshift force in each steady states is significantly different from the electromagnetic force model. For the optimization of gear shifting actuator with undetermined volume constraint, this paper presents a variable weight coefficient optimization method of electromagnetic linear actuator which equates the output forces under different steady states in the fitness function. These are intended to adjust the relationships among the optimized objects by using the fitness function to improve the overall optimization effect. In order to obtain the fitness value of each combination parameter accurately, finite element analysis (FEA) is adopted in this paper, to improve the efficiency of the algorithm, and a more efficient simulated annealing-particle swarm optimization algorithm (SA-PSO) is used by the proposed optimization method. Finally, experiment is carried out based on prototype of gearshift actuator to verify the optimization results. The results show that the maximum electromagnetic force and terminal electromagnetic force are both increased by more than 20%, and the volatility of gearshift force is reduced 26.4%, which ensures the structure compactness and fast response. The proposed method decreases the volatility by 27.5% compared with the constant weight coefficients and improves the gearshift force in each stage. INDEX TERMS DAMT, gearshift actuator, variable weight coefficient optimization, experiment.

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Section: Introductionmentioning

confidence: 99%

Variable Weight Coefficient Optimization of Gearshift Actuator With Direct-Driving Automated Transmission

Zhang

et al. 2020

IEEE Access

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“…A simplified diagram of the test vehicle's powertrain is shown in Fig. 3 [24]. Without considering their torsional and transverse vibrations, each part is considered to be a rigid body.…”

Section: Vehicle Driveline Modellingmentioning

confidence: 99%

Double layer control for AMT clutch in commercial vehicle starting: design and experiment

Song¹,

Wang²,

Liu³

et al. 2019

SV-JME

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Engagement control of an automatic mechanical transmission clutch during vehicle start-up has important influences on the safety, comfort, service life, energy consumption, and emissions of the vehicle. However, all existing control strategies use single-layer control, which leads to poor temperature adaptability. This paper develops a double-layer control strategy based on an automatic actuator to improve vehicle start-up performance. The governing characteristics of a diesel engine with a variable-speed governor are studied. The working principles and a model of the automatic actuator are described. A simulation of vehicle start-up is constructed and tested. Finally, the double-layer control strategy is verified in an experimental vehicle. The experimental and simulation results show that the double-layer control strategy provides shorter start times, less jerking, and lower friction, thereby demonstrating its effectiveness and practicability. Keywords: automatic mechanical transmission, start-up process, clutch engagement control, double-layer control Highlights • A double-layer control strategy is designed based on an automatic clutch actuator and controller. • Temperature changes affect clutch engagement performance during the vehicle start-up process. • Comparative outcomes verify the benefits of our scheme in terms of start time, jerking and friction work. • Experiments with an actual vehicle further validate the proposed control strategy.

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“…The application of a multispeed transmission for EVs consists of dual clutch transmission (DCT) [8,9], continuous variable transmission (CVT) [5], automatic transmission (AT) [10,11], and automated manual transmission (AMT) [6,[11][12][13]. Each of the above transmission configurations has its own merits and demerits.…”

Section: Introductionmentioning

confidence: 99%

Optimal Design and Control of a Two-Speed Planetary Gear Automatic Transmission for Electric Vehicle

Huang

Yin

2020

Applied Sciences

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Multispeed transmissions are helpful for improvement of the economy and drivability of electric vehicles (EVs). In this paper, we propose a two-speed transmission based on dual planetary gear mechanism, in which shifts are realized by torque transfer between two brakes located on ring gears. To synthesize the dynamic and economic performances of the vehicle, a multiobjective optimization problem is constructed for gear ratio optimization and Pareto-optimal solutions of gear ratio combinations are obtained by Nondominated sorting genetic algorithm-II (NSGA-II). In particular, the minimum electric energy consumption of the EV is calculated with a fast Dynamic Programming (DP) in each iteration. Following this, a constant-output-torque control (COTC) scheme is adopted for the torque phase and inertia phase of gearshift process to ensure constant output torque on the wheel. To enhance transient responses, the feedforward–feedback controller structure is applied and a disturbance observer is integrated to improve robustness. Simulation results demonstrate that the two-speed transmission has much better performance in terms of acceleration time and energy economy compared to the fixed-ratio transmission, and the proposed gearshift control method is able to achieve fast and smooth gear shift robustly while maintaining constant output torque.

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Dynamics and Control of Clutchless Automated Manual Transmissions for Electric Vehicles

Cited by 40 publications

References 29 publications

Variable Weight Coefficient Optimization of Gearshift Actuator With Direct-Driving Automated Transmission

Variable Weight Coefficient Optimization of Gearshift Actuator With Direct-Driving Automated Transmission

Double layer control for AMT clutch in commercial vehicle starting: design and experiment

Optimal Design and Control of a Two-Speed Planetary Gear Automatic Transmission for Electric Vehicle

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