Variator-assisted transmission and launch control methods for such a transmission
US10322723B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 12, 2015 |
| Grant date | Jun 18, 2019 |
| Priority date | — |
| Expiry date | Sep 8, 2035 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60Y2300/785
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A launch control method for a continuously variable transmission (CVT) is provided, where the CVT comprises a hydro-mechanical variator, a summing transmission connected to an output side of the variator, and a clutch for selectively connecting the summing transmission to an output member. The method determines whether a launch has been requested, and adjusts a variable displacement pump of the variator to a predetermined fixed displacement. Engagement of the clutch is commenced, and the method then determines whether a predetermined degree of slip exists between input and output elements of the clutch. The clutch is held at its present state of engagement when the predetermined degree of slip has been established, and the variator is placed into a torque control mode. The method then determines when there is zero slip between the input and output elements of the clutch, and then instructs full engagement of the clutch. The method then holds the pump of the variator at its current displacement until a predetermined time period has elapsed, before reverting to a standard transmission control algorithm. A CVT is also provided.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.