Title:
MODE TRANSITION CONTROL IN A CVT WITH FIXED GEAR FUNCTIONALITY
Document Type and Number:
WIPO Patent Application WO/2016/082132
Kind Code:
A1
Abstract:
A vehicle includes a power plant, continuously variable transmission (CVT), drive wheels, sensors, and controller. The CVT achieves a fixed gear/positive engagement and friction drive modes, and includes an input member that receives input torque from the power plant, an output member, and a variator assembly having drive and driven variator pulleys. The pulleys are connected to each other via an endless rotatable drive element, and to a respective one of the input and output members. Pulley actuators change a CVT speed ratio. The controller calculates a relative slip of the pulleys using measured speeds and displacements from the sensors, reduces the relative slip until the relative slip is below a calibrated speed limit or within a calibrated speed range via actuator control signal to the pulley actuators, and commands the fixed gear/positive engagement mode via positive engagement control signals to the CVT until the relative slip reaches zero.
Inventors:
HUANG YING (CN)
DUAN CHENGWU (CN)
DUAN CHENGWU (CN)
Application Number:
PCT/CN2014/092302
Publication Date:
June 02, 2016
Filing Date:
November 26, 2014
Export Citation:
Assignee:
GM GLOBAL TECH OPERATIONS INC (US)
International Classes:
F16H9/24; F16G1/28; F16G5/20; F16H61/02
Foreign References:
| EP1288532A2 | 2003-03-05 | |||
| JP2013127289A | 2013-06-27 | |||
| JP4293768B2 | 2009-07-08 | |||
| JP2014185716A | 2014-10-02 | |||
| US20090105041A1 | 2009-04-23 |
Attorney, Agent or Firm:
LIU, SHEN & ASSOCIATES (Building 110 Caihefang Road, Haidian District, Beijing 0, CN)
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