Control system for a continuously variable transmission
A hydraulic control is described for a continuously variable transmission having hydraulically adjustable axially movable pulley members and a gearing arrangement for the transmitting of torque between an input shaft and a output shaft. The control consists of: a source of fluid pressure; first valve means connected with the source and being operable to supply control fluid to one of the first valve means to impose a force thereon; feedback means for imposing a force proportional to the axial position of the one adjustable pulley member on the first valve means in addition to the control fluid imposed force; torque sensing means operatively connected with the gearing arrangement for transmitting a force proportional to the torque transmitted by the gearing arrangement; servo motor means operatively connected with the torque sensing means; second valve means connected with the torque sensing means and being operable on a change of torque transmission to distribute a pressure signal from the source to the servo motor means and the servo motor means being responsive to the pressure fluid to balance the force on the torque to balance the force on the torque sensing means and discontinue fluid distribution thereto; and means for directing the pressure signal from the second valve means to the first valve means.
- Assignee:
- General Motors Corp., Detroit, MI
- Patent Number(s):
- US 4608031
- OSTI ID:
- 5284982
- Country of Publication:
- United States
- Language:
- English
Similar Records
Continuously variable transmission and control
Continuously variable transmission
Related Subjects
330602* -- Vehicle Design Factors-- Engine-Transmission Matching
CONTROL
CONTROL EQUIPMENT
EQUIPMENT
FEEDBACK
FLOW REGULATORS
FLUIDS
GEARS
HYDRAULIC CONTROL DEVICES
HYDRAULIC FLUIDS
MACHINE PARTS
MECHANICAL TRANSMISSIONS
MOTORS
PRESSURE CONTROL
SERVOMECHANISMS
SHAFTS
SIGNALS
TORQUE
VALVES
VEHICLES
WORKING FLUIDS