Transmission gear shifting
US9651145B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 13, 2015 |
| Grant date | May 16, 2017 |
| Priority date | — |
| Expiry date | Nov 17, 2035 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2306/48
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A fixed-gear transmission including a plurality of planetary gear sets and a plurality of clutches is described. A method for controlling the fixed-gear transmission includes commanding a first iteration of a skip-at-sync transmission shift and monitoring clutch slip of an oncoming holding clutch associated with the skip-at-sync transmission shift during execution of the shift, which includes monitoring synchronization of the on-coming holding clutch and a maximum clutch slip overshoot value. A progressive clutch pressure ramp rate for the oncoming holding clutch is adaptively controlled in response to the clutch synchronization of the on-coming hold clutch during execution of a subsequent iteration of the skip-at-sync transmission shift.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.