Pulleys' Axial Movement Mechanism for Electro-Mechanical Continuously Variable Transmission

Abstract:

Pulley-based continuously variable transmission (CVT) with Metal Pushing V-belt (V-belt) is a type of automotive transmission that is widely applied currently by many car manufacturers worldwide. Unlike the conventional automotive transmissions, in a pulley-based CVT with V-belt, the transmission ratio (CVT ratio) is changed continuously without the use of discrete gears. Instead, the CVT ratio is varied through the simultaneous axial movement of the primary pulley and the secondary pulley. By axially moving both pulleys simultaneously, the radius of the V-belt on both pulleys will be changed accordingly, resulting in the change of the CVT ratio. The existing pulley-based CVTs in the market use electro-hydro-mechanical (EHM) actuation system to change and to maintain the desired CVT ratio through the hydraulic pressure. However, the application of EHM actuation system leads to some disadvantages, particularly in term of the high power consumption from the engine needed to maintain the desired CVT ratio. This reduces the efficiency of the powertrain system, which eventually increases the fuel consumption of the vehicles. In addition to that, the existing pulley-based CVTs also use single acting pulley mechanism to axially move the pulleys for changing the CVT ratio. Therefore, the issue of V-belt's misalignment, which shortens the lifespan of the V-belt, is inevitable here. In this paper, the pulleys' axial movement mechanism that uses electro-mechanical (EM) actuation system is proposed. Consequently, the working principle of the proposal is described and its potential benefits are discussed.

• Periodical: Applied Mechanics and Materials (Volume 663)
• Pages: 185-192
• DOI: https://doi.org/10.4028/www.scientific.net/AMM.663.185
• Online since: October 2014
• Authors: Kamarul Baharin Tawi*, Izhari Izmi Mazali, Bambang Supriyo, Nurulakmar Abu Husain, Mohd Salman Che Kob, Yusrina Zainal Abidin
• Keywords: Automotive, Axial Movement, Continuously Variable Transmission, Electro-Mechanical, Pulley

References

[1] S. Akehurst, An Investigation into the Loss Mechanisms Associated with a Pushing Metal V-belt Continuously Variable Transmission, Ph.D. Thesis, Univ. of Bath, Bath, United Kingdom, (2001).

[2] B. Bonsen, T. W. G. L. Klaassen, K. G. O. v. d. Meerakker, M. Steinbuch and P. A. Veenhuizen, Analysis of slip in a continuously variable transmission, in Proc. Dynamic Systems and Control, vol. 1 and 2, ASME International Mechanical Engineering Congress and Exposition IMECE, Washington, USA, 2003, pp.995-1000.

DOI: 10.1115/imece2003-41360

[3] K. B. Tawi, I. I. Mazali, B. Supriyo, N. A. Husain, M. Hussein, M. S. C. Kob and Y. Z. Abidin, Independent Clamping Actuator for Electro-Mechanical Continuously Variable Transmission, in Latest Trends in Circuits, Control and Signal Processing, Proc. 13th International Conference on Instrumentation, Measurement, Circuits and Systems IMCAS '13, Kuala Lumpur, Malaysia, 2013, pp.33-37.

DOI: 10.4028/www.scientific.net/amm.663.238

[4] E. Kirchner, Leistungsübertragung in Fahrzeuggetrieben; Grundlagen der Auslegung, Entwicklung und Validierung von Fahrzeuggetrieben und deren Komponente. Heidelberg, Germany: Springer, 2007, pp.402-406 and pp.408-422.

DOI: 10.1007/978-3-540-35292-1

[5] B. Bonsen, R. J. Pulles, S. W. H. Simons, M. Steinbuch and P. A. Veenhuizen, Implementation of a slip controlled CVT in a production vehicle, in IEEE Conference on Control Applications, Toronto, Canada, 2005, pp.1212-1217.

DOI: 10.1504/ijvd.2005.008473

[6] B. Bonsen, Efficiency optimization of the push-belt CVT by variator slip control, Ph.D. Thesis, Eindhoven Univ. of Tech., Eindhoven, Netherlands, (2005).

[7] T. W. G. L. Klaassen, The Empact CVT; Dynamics and Control of an Electromechanically Actuated CVT, Ph.D. Thesis, Eindhoven Univ. of Tech., Eindhoven, Netherlands, (2007).

[8] K. B. Tawi, Investigation of Belt Misalignment Effect on Metal Pushing V-Belt Continuously Variable Transmission, Ph.D. Thesis, Cranfield Univ., Cranfield, United Kingdom, (1997).

[9] Z. Faye, Study on Electro-Hydraulic Control System for CVT Metal Belt Axial Misalignment, IEEE International Conference on Mechatronics and Automation, Changchun, China, 2009, pp.1531-1535.

DOI: 10.1109/icma.2009.5246648

[10] K. B. Tawi, I. I. Mazali, B. Supriyo and M. S. C. Kob, Electro-Mechanical Continuously Variable Transmissions for Automotive Applications, in Proc. of International Conference on Innovative Technologies IN-TECH, Rijeka, Croatia, 2012, pp.149-153.

DOI: 10.1109/iciteed.2014.7007954

[11] B. Supriyo, K. B. Tawi, H. Jamaluddin, A. Budianto and I. I. Mazali, Shifting Performance Fuzzy-PID Ratio Controller of Electro-Mechanical Continuously Variable Transmission, in Latest Trends in Circuits, Control and Signal Processing, Proc. 3rd International Conference on Circuits, Systems, Control, Signals, Barcelona, Spain, 2012, pp.272-277.

[12] B. Supriyo, K. B. Tawi, M. Hussein, I. I. Mazali, M. S. C. Kob, M. Azwarie and Y. Z. Abidin, Ratio Calibration of Electro-Mechanical Dual Acting Pulley Continuously Variable Transmission System, in Latest Trends in Circuits, Control and Signal Processing, Proc. 13th International Conference on Instrumentation, Measurement, Circuits and Systems IMCAS '13, Kuala Lumpur, Malaysia, 2013, pp.38-43.

DOI: 10.4028/www.scientific.net/amm.663.238

[13] B. Supriyo, Realtime Implementation of Proportional Integral Derivative Based Ratio Controllers for Electro-Mechanical Dual Acting Pulley Continuously Variable Transmission, Ph.D. Thesis, Universiti Teknologi Malaysia, Johor Bahru, Malaysia, (2011).

DOI: 10.15282/jmes.8.2015.8.0130