Study on Shift Characteristics of Overrunning Clutch Shift-assistant Transmission

LI Gang, HUANG Xiangdong, YANG YANG Yong, ZHAO Kegang

Abstract

A novel type of automatic transmission named Overrunning Clutch Shift-assistant Transmission (OCT) was designed in the paper, which realized the shifts by the alternative work of friction clutch and Overrunning Clutch. Dynamic model of a 2-speed OCT was built to discuss the driveline vibration during shifts. Control strategy of the friction clutch and power source was presented in this paper, which was also verified by both simulation and test results. The results also show that the control strategy can make both upshift and downshift smooth, and jerk of the shifts is below 10 m·s-3.

 

Keywords: clutches,  shift-assistant,  traction un-interruption,  automatic transmission,  shift characteristic


Full Text:

PDF


References


DARRELL R. Performance characterization of automatic transmission upshifts with reduced shift times[R]. Washington DC: SAE International, 2015; 2015-01-1086.

YANG Y, HUANG X D, ZHAO K C,. et al. Impact of engagement of one-way clutch on shift characteristics of transmission [J]. Journal of Hunan University (Natural Sciences), 2016,43(4):44 - 51. (In Chinese)

LIU Y G.QIN D T,JIANG H .et al. Shift control strategy and experimental validation for dry dual clutch transmissions[J]. Mechanism and Machine Theory. 2014 ,75:41 - 53.

WALKER P D, ZHANG N. Modelling of dual clutch transmission equipped powertrains for shift transient simulations[J]. Mechanism and Machine Theory, 2013, 60:47 - 59.

CHO D. launch performance optimization of GTDI-DCT power-train [J]. SAE International Journal of Engines,2015,8(3) : 1111 - 1116.

HEATH R P G. CHILI) A J. Zeroshift automated manual transmission. [R]. Washington DC: SAE International. 2007: 2007-26-061.

HEATH R P G. CHILD A J. Zeroshift: A seamless automated manual transmission with no torque interrupt [R]. Washington DC:SAE International.2007:2007-01-1307.

HUANG X D, ZHAO K G. LIU Y W,et al. A novel type of uninterrupt shift transmission: CN101806359A [R], 2010-08-18. (In Chinese)

LIU Y W.ZHAO K G. HUANG X D. et al. Shift characteristics of mechanical transmission without torque interrupt [J]. Journal of South China University of Technology. 2011. 39 (6): 18-23. (In Chinese)

ALDO S. GABRIELE P. FA BIO V, et al. A novel seamless 2-speed transmission system for electric vehicle: principles and simulation results[J]. SAE International Journal of Engines. 2011.4(2): 2671 -2685.

YAMASAKI M. KONNO H. KUROIWA H. et al. Automated manual transmission with torque assist mechanism for reducing shift shock [R]. Washington DC: SAE International. 2005:1783-1786.


Refbacks

  • There are currently no refbacks.