Bicycle electric power assist device and bicycle
US11794854B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 2019 |
| Grant date | Oct 24, 2023 |
| Priority date | — |
| Expiry date | Nov 7, 2040 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB62M6/90
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A bicycle electric power assist device includes: an electric motor connected in a torque transmitting relationship to a crank arm or a crankshaft driven by a pedal force; a battery; a control unit configured to control operation of the electric motor; a rotation angle sensor configured to detect a crank rotation angle position of the crankshaft; and a current sensor configured to detect a motor current, wherein the control unit includes: a pedal force estimation/calculation unit configured to estimate the pedal force of the pedals from a difference between the motor current in a first crank rotation angle position and the motor current in a second crank rotation angle position which is different from the first crank rotation angle position; and a motor drive control unit configured to control a drive current of the electric motor according to the pedal force estimated by the pedal force estimation/calculation unit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.