Method and system for measuring at least one physical parameter for a bicycle

A method for measuring at least one physical parameter comprising at least one of speed and distance travelled by a bicycle during use thereof by a user, using at least one permanent magnet disposed on a frame portion or a fork for mounting a freely rotatable wheel and at least one measuring circuit with at least one magnetic sensor disposed on a wheel of the bicycle, the permanent magnet being disposed on the frame portion or the fork at a same distance from an axis of rotation of the wheel as the measuring circuit to be opposite to the measuring circuit at its passage during rotation of the wheel, comprising:

• setting the bicycle into movement with the wheel in rotation with the measuring circuit,
• detecting a passage of the magnetic sensor of the measuring circuit opposite to the permanent magnet by generating an induced voltage pulse at each passage of the measuring circuit in rotation,
• rectifying the voltage generated by the magnetic sensor using a rectifier and storing the rectified voltage on a smoothing capacitor to power the measuring circuit,
• calculating a physical parameter comprising at least one of the speed and the travelled distance of the bicycle in a calculation unit, which is clocked by a timepiece quartz oscillator of the measuring circuit, based on the induced voltage pulses received over time from the magnetic sensor using a value of a diameter of the wheel of the bicycle, and storing of at least one of measurements of speed and travelled distance obtained by integration into the calculation unit of the measuring circuit in a non-volatile memory of the measuring circuit, and
• wirelessly transmitting at least one measurement calculated in the calculation unit of the measuring circuit to a portable device carried by the user or on a portion of the bicycle using a signal transmission-reception unit linked to an antenna of the measuring circuit.

A method for measuring at least one physical parameter comprising at least one speed and distance travelled by a bicycle during use thereof by a user, using at least one permanent magnet disposed on a frame portion or a fork for mounting a freely rotatable wheel and at least one measuring circuit with at least one magnetic sensor disposed on a wheel of the bicycle, the permanent magnet being disposed on the frame portion or the fork at a same distance from an axis of rotation of the wheel as the measuring circuit to be opposite to the measuring circuit at its passage during the rotation of the wheel, comprising:

• setting the bicycle into movement with the wheel in rotation with the measuring circuit,
• detecting a passage of the magnetic sensor of the measuring circuit opposite to the permanent magnet by generating an induced voltage pulse at each passage of the measuring circuit in rotation,
• rectifying the voltage generated by the magnetic sensor using a rectifier and storing the rectified voltage on a smoothing capacitor to power the measuring circuit,
• determining passage times of the measuring circuit with the magnetic sensor opposite to the permanent magnet in a calculation unit, which is clocked by a timepiece quartz oscillator of the measuring circuit, based on induced voltage pulses provided by the magnetic sensor,
• wirelessly transmitting data relating to passage times of the magnetic sensor opposite to the permanent magnet to a portable device carried by the user or on a portion of the bicycle by a signal transmission-reception unit linked to an antenna of the measuring circuit, and
• calculating in a processing unit of the portable device the physical parameter and storing measurements of at least one of speed and travelled distance obtained by integration into the processing unit of the portable device in a non-volatile memory of the portable device.