This article describes the launching behaviors of passenger cars equipped with continuously variable transmission (CVT), which have different torsional couplings: a torsion damper and a dual mass flywheel. To reduce the driveline vibration and noise, a torsional coupling is installed in the CVT vehicle, in which the wet type multiplate clutch is used as a start device. In addition, a torsional coupling makes considerable effects on the launching performance of a vehicle. The launching performances, considered here, are the acceleration performance with various throttle positions and the transient characteristics of vehicle creep and throttle tip-in. By using the mathematical models of each driveline component, we developed a simulation program to investigate the launching performance in various launching conditions. In order to verify our simulation program, we performed the road test of a prototype vehicle that has torsion damper as a torsional coupling. Finally, we analyzed and compared the launching performances in two cases of a torsion damper and a dual mass flywheel using the developed simulation program.

Keywords:
road vehicles, automotive components, torsion, damping, vibration control, flywheels
Topics:
Dampers, Engines, Flywheels, Torsion, Vehicles, Couplings, Simulation
1.
Jones, P. G., 1965, “Torsional Vibration in Drivelines,” Transactions of SAE, S428.
2.
Drexl, H. J., 1987, “Torsional Dampers and Alternative Systems to Reduce Driveline Vibrations,” Transactions of SAE, 870393.
3.
Sebulke, A., 1987, “The Two-Mass Flywheel—A Torsional Vibration Damper for the Power Train of Passenger Cars—State of the Art and Further Technical Development,” Transactions of SAE, 870394.
4.
Boedo, S., and Freyburger, D. E., 1991, “A Grease-Filled Coupling for CVT Vehicles,” Transactions of SAE, 911940.
5.
Sato, Y., Tanaka, H., Ozaki, T., and Shoji, M., 1996, “Fuzzy Control of Engagement of CVT-Starting Wet-Clutch,” Proceedings of International Conference on Continuously Variable Power Transmissions, Sept. 11–12.
6.
Funatsu, K., 1996, “Electronic Control System of Honda for CVT,” Proceedings of International Conference on Continuously Variable Power Transmissions, Sep. 11–12.
7.
Daewoo Motor Company, 1998, G7 Technical Report: Development of Energy Efficient CVT Technology, Korea Ministry of Science.
8.
Amijima
,
S.
,
1991
, “
Study on Axial Force and its Distribution for a newly developed Block-type CVT Belt
,”
Int. J. Veh. Des.
,
12
(3)
(3)
.
9.
Asayama
,
H.
,
1995
, “
Mechanism of Metal Pushing Belt
,”
Transactions of JSAE
,
9532209
9532209
.
10.
LuK, 1994, Comfort and Economy, LuK Drive Train Systems.
11.
Jania
,
L. P.
,
1959
, “
Engagement Characteristics of Wet-Type Clutches
,”
Transactions of SAE
,
67
.
12.
Anderson
,
R. L.
, and
Bierley
,
R. L.
,
1965
, “
Measurement of Automatic Transmission Shift Performance
,”
Transactions of SAE
,
650465
650465
.
13.
Steinhagen
,
H. G.
,
1980
, “
The Plate Clutch
,”
Transactions of SAE
,
800978
800978
.
14.
Spicer
,
J. B.
,
Richardson
,
C. J. K.
,
Ehrlich
,
M. J.
,
Berstein
,
J. R.
,
Fukuda
,
M.
, and
Terada
,
M.
,
2001
, “
Effects of Frictional Loss on Bicycle Chain Drive Efficiency
,”
ASME J. Mech. Des.
,
123
(
4
), pp.
598
–
605
.
15.
Carbone
,
G.
,
Mangialardi
,
L.
, and
Mantriota
,
G.
,
2001
, “
Theoretical Model of Metal V-Belt Drives During Rapid Ratio Changing
,”
ASME J. Mech. Des.
,
123
(
1
), pp.
111
–
117
.
16.
Huang
,
Y. M.
, and
Hu
,
B. S.
,
2003
, “
Minimum Fuel Consumption and CO Emission and Optimum Speed of the Motorcycle with a CVT
,”
ASME J. Mech. Des.
,
125
(
4
), pp.
311
–
316
.
17.
Kim
,
J.
,
2004
, “
Design of a Hydraulic System for a Power Split Type CVT
,”
Transactions of KSAE
,
12
(
1
), pp.
168
–
173
.
Copyright © 2005
 by ASME
You do not currently have access to this content.