Method and apparatus for preventing over-shifting on electric vehicles
US9132825B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jan 21, 2014 |
| Grant date | Sep 15, 2015 |
| Priority date | — |
| Expiry date | Jan 21, 2034 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16H2061/166
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
Methods and apparatus are provided for preventing over-shifting in electric vehicles having a multi-gear transmission and an electric motor operable in a drive mode and a regenerative braking mode. The method includes: (a) predicting the speed of the electric motor resulting from downshifting from a current gear being used to a next lower gear based on a current speed of the electric vehicle, a current speed of the electric motor, and a gear ratio of the next lower gear; (b) determining if the speed of the electric motor predicted in (a) will cause an overvoltage condition from regenerative braking or an overspin condition in the electric motor; (c) preventing downshifting to the next lower gear when it is determined that the downshifting will cause an overvoltage condition or an overspin condition in the electric motor; and (d) repeating steps (a), (b), and (c) a plurality of times.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.