Control system and method for a continuously variable transmission
US6979276B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 16, 2001 |
| Grant date | Dec 27, 2005 |
| Priority date | — |
| Expiry date | Dec 16, 2021 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2037/0886
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A control system for a multi-regime continuously variable ratio transmission system. The system has input and output shafts and a continuously variable ratio transmission unit (“variator”) connected to the input shaft. Also included is a mixing epicyclic gear train with a first input gear coupled to the input shaft, a second input gear connected to the variator output and an output gear driving an output shaft. Fluid-pressure actuated clutches engage the outputs and ratio combinations to operate the CVT in a number of regimes. The control system includes means for engaging the clutch of a new regime, retaining both clutches engaged in a synchronous mode and disengaging the clutch of the old regime. The control system also has means for applying fluid pressure to engage the new regime clutch in a single stage at the maximum available clutch engaging fluid pressure.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.