Sensing method for wheel rotation, wheel localization method, and wheel localization system
AssigneeSilergy Semiconductor Technology (Hangzhou) LTD
InventorChikang Liu
Life of this patent
Estimating the term…
Abstract
A method of sensing wheel rotation can include: sensing magnetic force information in an environment of a wheel by a magnetometer to obtain measured magnetic force information; generating relative magnetic force information by performing mathematical operation processing in accordance with the measured magnetic force information, where the relative magnetic force information does not change with geomagnetic field and does change with a rotation angle of a wheel; and obtaining angle information related to the rotation angle of the wheel in accordance with the relative magnetic force information.
Claims17
An apparatus for localizing at least one wheel of a vehicle, the apparatus comprising:
- a) at least one magnetometer arranged in at least one wheel, and being configured to obtain measured magnetic force information;
- b) an anti-lock brake system (ABS) unit configured to provide rotation position information related to rotation positions of each wheel;
- and
- c) an electronic control unit configured to generate relative magnetic force information that does not change with geomagnetic field and does change with a rotation angle of a wheel in accordance with the measured magnetic force information, obtain angle information related to the rotation angle of the wheel between a first time point and a second time point in accordance with a change of the relative magnetic force information between the first and the second time points, obtain rotation information of the rotation angles of each wheel in accordance with the rotation position information, and estimate an estimated rotation angle of each wheel between the first and second time points in accordance with the rotation information, and to perform localization of the wheel by matching an estimated rotation angle to a calculated rotation angle obtained in accordance with the angle information between the first and the second time points, wherein the electronic control unit is configured to determine the position of the wheel in the vehicle in accordance with more than two sets of the comparison between the calculated rotation angle and each of the estimated rotation angles.
A method of wheel localization, the method comprising:
- a) obtaining angle information of a wheel in a vehicle that is related to a rotation angle of the wheel;
- b) obtaining rotation position information on rotation positions of each wheel from an anti-lock brake system (ABS) unit;
- c) obtaining rotation information of each wheel on the rotation angle in accordance with rotation position information;
- d) estimating an estimated rotation angle of each wheel between a first time point and a second time point in accordance with the rotation information;
- e) comparing each of the estimated rotation angles against a calculated rotation angle of the wheel obtained in accordance with the angle information between the first and the second time points;
- f) performing localization of the wheel in the vehicle in accordance with a comparison result that an estimated rotation angle matches the calculated rotation angle;
- and
- g) determining the position of the wheel in the vehicle in accordance with more than two sets of the comparison between the calculated rotation angle and each of the estimated rotation angles.
Dependencies are inferred from the claim text.