Sensing method for wheel rotation, wheel localization method, and wheel localization system
AssigneeSilergy Semiconductor Technology (Hangzhou) LTD
InventorChikang Liu
Life of this patent
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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.
Claims10
A tire pressure monitoring system (TPMS) for a vehicle, the system comprising:
- a) at least one magnetometer arranged in at least one wheel of the plurality of wheels of the vehicle, and being configured to obtain measured magnetic force information in the environment in which the at least one wheel is positioned;
- b) a tire pressure sensor arranged in at least one of the plurality of wheels of the vehicle to obtain tire pressure information related to the tire pressure of the vehicle;
- c) an electronic control unit configured to receive the measured magnetic force information, tire pressure information, and a rotational position related to rotational positions of each wheel provided by an anti-lock braking system (ABS) unit of the wheel information, and to determine which wheel in the plurality of wheels the wheel comes from according to the measured magnetic force information and the rotational position information, and then assigning the identification name of the tire pressure sensor to the wheel;
- and
- d) wherein the electronic control unit is configured to perform mathematical operations on the measured magnetic force information to obtain relative magnetic force information, obtain the angle information related to the rotation angle of the wheel according to the change amount of the relative magnetic force information, obtain rotation information of the rotation angles of each wheel in accordance with the rotation position information, estimate an estimated rotation angle of each wheel between a 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.
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 in accordance with the measured magnetic force information, obtain angle information related to the rotation angle of the wheel in accordance with a change of the relative magnetic force information, 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 a 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.
Dependencies are inferred from the claim text.