The Journal of Engine Research

The Journal of Engine Research

Optimization of car gearbox conversion ratios based on providing maximum traction in different gears

Document Type : Original Article

Authors
Seyed Masoud Hashemi 1
Masoud Tarahomi 2
Moslem Houshyar 2
1 Assistant Professor, Mechanical Engineering, Malek Ashtar University of Technology, Iran
2 MSc graduate, Mechanical Engineering, Malek Ashtar University of Technology, Iran
10.22034/er.2022.697911
Abstract
The purpose of this paper is to optimize the gearbox conversion ratios of vehicles and the gearbox gear ratios are calculated in such a way that the engine provides the maximum possible traction, thus providing the maximum slope force with respect to the stability condition. First, the gearbox conversion ratios are determined by considering the type of vehicle and the appropriate calculation method. Then the gear conversion ratios are changed so that, considering the stability condition, the traction force diagram in the gears is as close as possible to the ideal traction force diagram and the uncovered parts are less in the ideal traction force diagram and the actual middle gear diagram. This is done for a two-stage gearbox with two intermediate axles, which is located in the transmission line with a diesel engine. The obtained results show that with the optimization of the gearbox, the rate of improvement of traction force in the maximum case is 17.5%, slope 16.3%, acceleration 17.2% and torque 13.5% in 3rd gear. Comparisons made for validation with a base vehicle also show a good agreement between the base vehicle and the vehicle in this study.
 
Keywords
Gearbox
Engine
Optimization
traction force
stability condition
[1] M. Mitschke, , Dynamid der kraftfahrzeuge, Band A, Antrieb und bremsung, 3, Auflage, Springer, Germany Translated by: S. M. Hashemi,1995
[2] S. M. Hashemi, Vehicle design, Power transmission systems, Malek ashtar university, Iran, 2015, (In Persian)
[3] M. El-Sayed, D. Song, Automotive performance optimization, Transmission and Driveline Symposium, SAE Technical, paper series: 980825, 1998
[4] A. Masomi, M. Shariat, A. Motamedi, Optimal design of car gearbox based on performance and fuel consumption indicators, Journal of faculty of engineering, Vol 40, Tehran, 2007
[5] M. Rezaee, V. Shaterian, Provide a model for feasibility of replacing continiusly variable transmission with a manual transmission to reduce fuel consumption, Journal of engine research, Vol 16, Iran, 2010
[6] M. Peng, J. Lin, X. Liu, Optimizing Design of Powertrain Transmission Ratio of Heavy Duty Truck, IFAC (International Federation of
Automatic Control) Hosting by Elsevier Ltd, China, 2018
[7] J. Sun, Y. Chiu, W. Zuo, S. Zhou, J. Gan, Y. li, Transmission ratio optimization of two-speed gearbox in battery electric passenger vehicles, Advances in Mechanical Engineering, Vol 13, 2021
[8] L. Han, H. Zhang, R. Fang, H. Liu, Optimization Transmission Efficiency with Driver Intention for Automotive Continuously Variable Transmission under Slip Mode, Chinese Journal of Mechanical Engineering, China, 2021
[9] G. Lechner, H. Naunheimer, Automotive Transmissions, published by Springer, Berlin, Heldelberg, New York, 1994
[10] J. Reimpell, H.t Stoll, J. W. Betzler, The Automotive Chassis:Engineering Principles, Second edition published by Butterworth-Heinemann, Oxford, Auckland, 2001
[11] Motor management diagram, Ford econovan (Diesel), http://www.ford.com, Germany, 2000
The Journal of Engine Research
Volume 66, Issue 66
Spring 2022
Pages 36-45

  • Receive Date 09 March 2022
  • Revise Date 06 June 2022
  • Accept Date 06 June 2022