Power-assisted bicycle with a gear shift smoothening function
US8886426B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 2, 2012 |
| Grant date | Nov 11, 2014 |
| Priority date | — |
| Expiry date | May 18, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB60L2200/12
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A power-assisted bicycle includes a bicycle body with a power assistance provider and a derailleur, a microcomputer, a gear-shift control driver, and sensors. When the microcomputer decides to perform gear shifting, it controls the power assistance provider to provide an assistant power output and the gear-shift control driver to drive the derailleur to shift gears properly subject to a before-shifting time period, an in-shifting time period and an after-shifting time period. Further, the microcomputer controls the power assistance provider to change the current assistant power to a predetermined low assistant power during the before-shifting time period, or to maintain the predetermined low assistant power during the in-shifting time period, or to change the assistant power output to a level higher than the current assistant power and then to return to the said current assistant power after the end of the after-shifting time period.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.