Coordinated shift control of nonsynchronizer transmission for electric vehicles based on dynamic tooth alignment

This paper addresses the integration of the energy management and the shift control in parallel hybrid electric vehicles with dual-clutch transmission to reduce the fuel consumption, decrease the pollutant emissions, and improve the driving comfort simultaneously. Dynamic programming with a varying weighting factor in the cost function is proposed to balance the shift frequency and the fuel consumption for the power-split control and gear schedule design. Simulation results present that the drivability can be improved with a varying weighting factor due to fewer shift events while the fuel consumption is only slightly increased compared to dynamic programming with a constant weighting factor. A shift-energy-management strategy integrating the upshift and power-split control based on a multi-objective optimization is presented where model predictive control is employed to ensure engine load rate constraints. The strategy can smoothen the engine torque through torque compensation from the electric motor to prevent engine transient emissions resulting from a sudden load change. In a simulation study, the NOx and HC emissions could be reduced by 1.4% and 2.6% with 2% increase of the overall fuel consumption for the Federal Test Procedure 75 by smoothening the engine torque. For the New European Driving Cycle, 0.9% and 1.1% reduction of NOx and HC emissions could be achieved with only 0.3% more fuel consumption.

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A novel shift control concept for multi-speed electric vehicles

Mechanical Systems and Signal Processing ◽

10.1016/j.ymssp.2018.04.017 ◽

2018 ◽

Vol 112 ◽

pp. 171-193 ◽

Cited By ~ 11

Author(s):

Wenwei Mo ◽

Paul D. Walker ◽

Yuhong Fang ◽

Jinglai Wu ◽

Jiageng Ruan ◽

...

Keyword(s):

Electric Vehicles ◽

Shift Control ◽

Control Concept

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Observer-Based Backstepping Controller Design for Gear Shift Control of a Seamless Clutchless Two-Speed Transmission for Electric Vehicles

2015 IEEE Vehicle Power and Propulsion Conference (VPPC) ◽

10.1109/vppc.2015.7352986 ◽

2015 ◽

Cited By ~ 2

Author(s):

Mir Saman Rahimi Mousavi ◽

Ali Pakniyat ◽

Mohamed K. Helwa ◽

Benoit Boulet

Keyword(s):

Electric Vehicles ◽

Controller Design ◽

Gear Shift ◽

Shift Control ◽

Backstepping Controller

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A Study on Shift Process Control of AMT for Battery Electric Bus

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.88-89.128 ◽

2011 ◽

Vol 88-89 ◽

pp. 128-133 ◽

Cited By ~ 1

Author(s):

Hong Bo Liu ◽

Yu Long Lei ◽

Yu Zhang ◽

Xiao Lin Zhang ◽

You De Li

Keyword(s):

Electric Vehicles ◽

Control Strategy ◽

Mechanical Transmission ◽

Environment Protection ◽

Battery Electric Vehicles ◽

Shift Control ◽

Shift Performance ◽

Electric Bus ◽

Dynamics Models ◽

Energy Shortage

With ever increasing concerns on energy shortage and environment protection, the development of the battery electric vehicles (BEVs) has taken on an accelerated pace. In this paper, firstly, an AMT (Automatic Mechanical Transmission) without clutch and synchronizer used in battery electric bus is introduced. Then, the dynamics models of the shift process are created, and the factors that affect the shift performance are discussed. Finally, the AMT shift control strategy is designed and applied in the field buses. The on-road tests results show that the shift control strategy is valid and reliable, which meets the vehicle comfort and power requirements.

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