Sensor apparatus and method for determining pedalling cadence and travelling speed of a bicycle
US9075076B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 15, 2010 |
| Grant date | Jul 7, 2015 |
| Priority date | — |
| Expiry date | Jan 11, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P1/023
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor (1) for determining both a cadence of a crank and a travelling speed of a bicycle includes an accelerometer (4) providing a first signal dependent on a first acceleration along a first measurement axis (z) and a second signal dependent on a second acceleration along a second measurement axis (y) perpendicular to the first measurement axis. The accelerometer (4), a wireless transmitter (6) and a power source (8) are contained in a housing (2) that can be attached to a wheel of the bicycle. The sensor (1) determines the cadence from the rate at which consecutive changes of polarity occur in the first signal, or from the rate at which consecutive positive and negative extreme values occur in the first signal. The sensor also determines the travelling speed from the rate at which consecutive maximum and minimum extreme values occur in the second signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.