Dimensional Synthesis of a Dedicated Hybrid Transmission Through Efficiency Optimization of Gear Trains
Hybridization is a promising solution to reduce regulated emissions without compromising vehicle’s performance, what makes the development of transmission systems for hybrid electric vehicles a relevant and prolific study field. Inside this scenario, one new transmission category emerges: the Dedicated Hybrid Transmission (DHT), which includes transmission systems that use at least two sources of propulsion, an internal combustion engine and at least one electric motor, and whose functionality depends on both propulsion sources. One important aspect to be studied is the gear trains’ mechanical efficiency of DHTs. In this paper, a DHT available on the market was selected as a case study to apply a technique of dimensional synthesis focusing on efficiency. The technique is based on an electromechanical analogy associating graph and screw theories with Kirchhoff laws. The objective is to optimize the DHT’s efficiency by altering the gears’ pitch radii, seeking to reduce the consumption of a vehicle under city driving conditions.
KeywordsEfficiency optimization Automotive transmission Gear trains Dimensional synthesis Graph and screw theories Electromechanical analogy
Unable to display preview. Download preview PDF.
thanks are due to CNPq for financial support.
- 1.AVL: Avl future hybrid 7 and 8 mode (2016), https://www.avl.com/documents/10138/2699442/Solution+Sheet+Future+Hybrid, accessed: 02 oct. 2017
- 5.Davies, T.: The 1887 committee meets again. subject: freedom and constraint. In: Proceedings of a Symposium commemorating the legacy, works and life of Sir Robert Stawell Ball upon the 100th Anniversary of ‘A Treatise on the theory of Screws’ (2000)Google Scholar
- 6.Ehsani, M., Gao, Y., Emadi, A.: Modern electric, hybrid electric, and fuel cell vehicles: fundamentals, theory, and design. CRC press (2009)Google Scholar
- 7.EPA: Dynamometer drive schedules (2017), https://www.epa.gov/vehicle-and-fuel-emissions-testing/dynamometer-drive-schedules, accessed: 25 jul. 2017
- 11.Naunheimer, H., Bertsche, B., Ryborz, J., Novak, W.: Automotive transmissions: Fundamentals, selection, design and application. Springer Science & Business Media (2010)Google Scholar
- 12.de Souza, M.B.: Eficiency optimization of a hybrid automotive transmission’s gear train using graph and screw theories. Master’s thesis, Universidade Federal de Santa Catarina (2018)Google Scholar
- 13.de Souza, M.B., de Souza Vieira, R., Martins, D., Cazangi, H.R., Laus, L.P.: Mechanical efficiency determination of a dedicated hybrid transmisssion using graph and screw theories: a case study. In: 24th ABCM International Congress of Mechanical Engineering (COBEM 2017). ABCM (2017)Google Scholar
- 14.Xue, N.: Design and Optimization of Lithium-Ion Batteries for Electric-Vehicle Applications. Ph.D. thesis, University of Michigan (2014)Google Scholar