Electric Vehicle (EV) equipped with two-speed transmission has benefit in improving dynamic performance and saving battery consumption. However, during gear shift process, torque interruption and shift impact may lead to a bad shift quality. This work investigates gear shift process in an Automated Manual Transmission (AMT) configuration-based two-speed transmission. First of all, a typical gear shift process is analyzed. Parameters like motor speed, shift force, motor torque change rate, and speed difference between synchronizer and target engage gear are all included to find the relationships with shift duration. Then vehicle jerk is introduced as a criterion to evaluate shift impact. Besides, a comprehensive shift control strategy is developed. While keeping the output torque at wheels unchanged, the shift strategy also improved motor working efficiency after gear shift. Therefore, to determine an optimum shift strategy and achieve a balance among different parameters, Genetic Algorithm (GA) multi-objective optimization method is implemented. Through GA optimization, several solutions are presented and discussed. The final results can well satisfy the requirements of different objectives. This work provides a novel and efficient method for shift strategy development.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Two-Speed Transmission Gear Shift Process Analysis and Optimization Using Genetic Algorithm


    Additional title:

    Sae Int. J. Elec. Veh


    Contributors:
    Yang, Jiansen (author) / Wang, Xinyu (author) / Cao, Zhan (author)


    Publication date :

    2020-01-16


    Size :

    9 pages




    Type of media :

    Conference paper


    Type of material :

    Print


    Language :

    English




    Genetic Algorithm Based Gear Shift Optimization for Electric Vehicles

    Jain, Himanshu / Singh, Sanchit / NV, Shivaram et al. | SAE Technical Papers | 2016


    Gear shift optimization

    Niste, K. | Tema Archive | 1989



    Marine transmission with synchronizer to shift into high speed gear

    VANSELOUS JOSEPH S / SHARKNESS ERIC / JAGER JIRI | European Patent Office | 2018

    Free access

    Transmission gear shift indication techniques

    YU SONGPING / OTHMAN MOHAMED / MCNAMARA RYAN B et al. | European Patent Office | 2016

    Free access