Simulation and Studies on a Double Transition Shift Transmission

Paper #:
  • 2010-01-1978

Published:
  • 2010-10-05
Citation:
Chang, Y. and Wu, D., "Simulation and Studies on a Double Transition Shift Transmission," SAE Technical Paper 2010-01-1978, 2010, https://doi.org/10.4271/2010-01-1978.
Author(s):
Affiliated:
Pages:
7
Abstract:
DTS (Double Transition Shift) transmission can achieve multiple-speed automatic transmission by using minimum number of planetary gear sets and clutches. Historically DTS transmission has been overlooked because of the complexity to perform high quality shifts.In this paper, a vehicle model with a traditional AT (Automatic Transmission) is studied first using Matlab/SimDriveline; the simulation results and the vehicle road test data show good agreement. Then a DTS transmission is established based on the same vehicle model. An open-loop control module is developed. All possible parameters which can influence the shift performance are studied. The parametric study shows a double transition shift consists of two inter-action shifts, the parameters which can influence the shift quality include the overlap time of these two inter-action shifts, shifts ending time, downshift parameters and upshift parameters; downshift parameters include initial step of an oncoming brake, pressure slope of an oncoming brake, initial step of an offgoing brake, and pressure slope of an offgoing brake; upshift parameters include initial step of an oncoming clutch, and pressure slope of an oncoming clutch. And finally, the comparison of the vehicle performance with the same vehicle data but different transmissions, one is DTS and the other is traditional AT, is presented. The simulation results indicate that DTS vehicle has a smaller shift shock at lower throttle opening positions, minor shift quality decline and better fuel economy performance at higher throttle opening positions.
Access
Now
SAE MOBILUS Subscriber? You may already have access.
Buy
Select
Price
List
Download
$28.00
Mail
$28.00
Members save up to 42% off list price.
Share
HTML for Linking to Page
Page URL

Related Items

Article
2017-07-26
Technical Paper / Journal Article
2011-05-17
Training / Education
2010-08-03