Control valve system for a continuously variable belt driven transmission for motor vehicles
This patient describes a hydraulic valve system for controlling a continuously variable drive ratio automotive vehicle transmission adapted to shift continuously between different drive ratios and having first and second control pulleys driveably connected by an endless traction belt, a displacement cylinder associated with each pulley, the location of the belt on each pulley being radially variable in response to hydraulic fluid pressure in the associated cylinder to shift between the drive ratios, comprising; first and second hydraulic fluid pumps; main pressure regulation valve means connected to the discharge of the second pump for producing line pressure and torque converter supply pressure; torque converter means for hydrodynamically, driveably connecting the engine of the vehicle to a transmission pulley, the torque converter means having an impeller, a turbine, the impeller connected to the engine, the turbine connected to the pulley; a lockup clutch adapted to selectively driveably connect the turbine and the impeller when hydraulic fluid flows in a first direction through the torque converter and to disconnect the turbine and impeller when the flow is in the opposite direction; a lockup valve supplied with line pressure, coupled to the electronic control means for opening and closing communication between line pressure and a converter lockup pressure line in accordance with the control of the electronic control.
- Assignee:
- Ford Motor Co., Dearborn, MI
- Patent Number(s):
- US 4790216
- OSTI ID:
- 6410940
- Resource Relation:
- Patent File Date: Filed date 26 Aug 1987
- Country of Publication:
- United States
- Language:
- English
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