Arrangement for operating an automotive CVT
US6537176B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 27, 2001 |
| Grant date | Mar 25, 2003 |
| Priority date | — |
| Expiry date | Mar 27, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H61/66272
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
An arrangement for operating a CVT transmission of a motor vehicle is proposed which comprises a hydraulic circuit supplied from a hydraulic pressure source (8) having two parallel second branches (16, 17) attached to the first branch (9) of the hydraulic circuit each for supplying pressure to a hydraulic actuator (4, 5) for respectively a cone pulley pair (2, 3) of the transmission wherein with the first branch (9) and each second branch (16, 18) an independently controllable pressure valve system (12, 13, 18, 19, 20, 21) is associated for adjusting the hydraulic pressure in the respective branch (9, 16, 17). According to the invention at least one of the pressure valve systems (18, 19, 20, 21) associated with the second branches (16, 17) has a controllable pressure-differential valve (18, 19) connected between the first branch (9) and the second branch (16, 17) concerned. At the same time the control unit (15) is designed for the purpose of optionally working in a first pressure control mode in which it adjusts the pressure in the second branch (16, 17) attached to the pressure-differential valve (18, 19) by control of the pressure valve system (12, 13) associated with the second…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.