Title:
VARIATOR CHARACTERIZATION FOR FEED FORWARD TORQUE CONTROL
Document Type and Number:
WIPO Patent Application WO/2013/048601
Kind Code:
A3
Abstract:
In an embodiment, torque control operation is provided in a transmission having a variable displacement variator (100) with a hydraulic actuator (104). The transmission is engaged in a neutral state (401) such that the variator output experiences substantially zero torque, and a first hydraulic pressure sweep to the hydraulic actuator is commanded (402) while a corresponding sweep of motor speed ratio of the variator is recorded. The transmission is engaged into a locked mode (403) providing a fixed output speed and a second hydraulic pressure sweep to the hydraulic actuator is commanded (404), and a corresponding sweep of variator output torque is recorded during this sweep. A torque/pressure map (408) is then constructed relating motor torque, motor speed ratio, and actuator pressure by scaling the sweep of motor speed ratios and the sweep of variator output torque. The resultant map (303) is usable to provide feed forward torque control of the transmission.
Inventors:
LISTER BRIAN (US)
BRICKNER CHAD (US)
BRICKNER CHAD (US)
Application Number:
PCT/US2012/042854
Publication Date:
May 23, 2013
Filing Date:
June 18, 2012
Export Citation:
Assignee:
CATERPILLAR INC (US)
LISTER BRIAN (US)
BRICKNER CHAD (US)
LISTER BRIAN (US)
BRICKNER CHAD (US)
International Classes:
F16H61/14; F16H15/38; F16H61/04; F16H61/66
Foreign References:
| JP2003185016A | 2003-07-03 | |||
| US5782711A | 1998-07-21 | |||
| US20040186648A1 | 2004-09-23 | |||
| US7841455B2 | 2010-11-30 | |||
| US20080139363A1 | 2008-06-12 |
Attorney, Agent or Firm:
EARLE, Kevin, C. et al. (Peoria, IL, US)
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