Device for ascertaining data for determining a velocity of a vehicle, evaluation device, and method for this purpose
AssigneeK.W.H. Ciclosport Vertriebs GmbH
InventorsGeorg Jahnen, Christian Becker
Life of this patent
Estimating the term…
Abstract
The invention relates to a device for ascertaining data for determining a velocity of a vehicle having a magnet, which is attachable to a wheel and executes a circular movement upon rotation of the wheel. Furthermore, a sensor unit is provided for recording signals due to the circular movement of the magnet. The sensor unit has at least one sensor for measuring a quantitative magnetic field strength change. In this case, the sensor is configured to sample the magnetic field strength change at a sampling frequency of at least 200 Hz. In addition, the invention relates to a method for ascertaining data for determining a velocity of a vehicle.
Claims13
An apparatus for determining a velocity of a vehicle, wherein the vehicle is adapted to transport an individual and has at least one wheel, the apparatus comprising:
- a magnet, which is adapted to be attached to the wheel and which carries out a circular movement upon rotation of the wheel;
- a sensor unit for recording signals, caused by the circular movement of the magnet, wherein the sensor unit is configured to be fastened on a component of the vehicle past which the magnet moves;
- the sensor unit having at least one sensor configured to measure a magnetic field strength and/or a magnetic field strength change, and the sensor further being configured to sample the magnetic field strength change at a sampling frequency of at least 200 Hz, in that at least two sensors are provided on the wheel for measuring a magnetic field strength and/or a magnetic field strength change;
- and in that the at least two sensors for measuring a magnetic field strength and/or a magnetic field strength change are arranged in a direction of the circular movement of the magnet, and outputs from the at least two sensors relating to at least the magnetic field strength and/or the magnetic field strength change are used to determine the velocity of the at least one wheel.
A method for ascertaining data for determining a velocity of a vehicle adapted for transporting individuals, the vehicle having at least one wheel and a magnet attached to the wheel to execute a circular movement during rotation of the wheel, and a sensor unit secured to a component of the vehicle for recording signals caused by circular movement of the magnet as the magnet moves past the sensor unit as the wheel rotates, the sensor unit having at least two sensors for measuring a magnetic field strength and/or a magnetic field strength change the method comprising:
- determining a magnetic field strength and/or a measurement of the magnetic field strength change by means of the sensor unit;
- the measurement being carried out at a sampling frequency of at least 200 Hz, and
- wherein the at least two sensors for measuring a magnetic field strength and/or a magnetic field strength change are arranged in a direction of the circular movement of the magnet when it is attached to the wheel;
- the sensor unit carries out at least two measurements of the magnetic field strength and/or the magnetic field strength change at adjacent locations which are arranged in the direction of the circular movement of the magnet and
- in that, to determine the velocity of the vehicle, time intervals Δ1, Δ2 of the at least two measurements of the magnetic field strength and/or the magnetic field strength change are evaluated.
Dependencies are inferred from the claim text.