Transmission with L1-L2 shift method while engine braking
US10113639B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 4, 2015 |
| Grant date | Oct 30, 2018 |
| Priority date | — |
| Expiry date | May 29, 2037 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2200/2084
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A transmission includes a stationary member, an input member, and gear sets each having a plurality of nodes. The transmission includes a first clutch that connects a node of one gear set to the stationary member to establish an L1 mode, and a second clutch that connects a node of another gear set to the stationary member to establish a 2L mode. A SOWC is connected between nodes of two gear sets, and a controller, in response to a requested shift L1-L2 shift while engine braking, executes a method to release the first clutch and thereby enters a neutral mode. The SOWC is released when slip across the first clutch exceeds a first threshold, then the first clutch reapplied when a SOWC slip level exceeds another threshold to thereby enter a 1st gear freewheeling mode. The second clutch is reapplied to enter the L2 mode and resume engine braking.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.