Speeding innovation for industry
Success | Internet of things
Leti innovation stories
Cyclists who want to know how much power they are generating with each push
of the pedal can find out by mounting several sensors on their bicycles, either on
the rear-wheel axis or on the pedals themselves. France-based carbon-composite
bicycle component manufacturer Corima is taking this concept even further. The
manufacturer’s new power sensor—developed in conjunction with Leti—is integrated
into its carbon bicycle wheels, where it can measure power sight unseen.
Integrating the sensor into a carbon
wheel weighing in at just 500 grams
created some major challenges. The
new sensor had to be both small and
Power output is calculated via indirect
measurements and takes into account
other factors affecting the wheel, such
as the cyclist’s weight and fluctuating
wheel angles due to curves or a
standing pedaling posture, for instance.
The measurement remains robust at
temperatures ranging from -15°C to 50°C.
Leti contributed its expertise in the field
of sensors, while Corima brought proven
experience modelling the distribution
of power through bicycle wheels.
The development work also required
solid know-how in electronics, signal
processing, and wireless communication
(to transmit data to the meter in real time).
Resources and skills
CEA is a French government-funded technological research organisation in four main areas: low-carbon energies, defense and security, information technologies and health technologies. A prominent player in the European Research Area, it is involved in setting up collaborative projects with many partners around the world.