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US 11,953,515 B2Granted
Method for computing angular velocity and system for using the same
AssigneeSTMicroelectronics (China) Investment Co., Ltd.
InventorDaopeng Fu
Life of this patent
Estimating the term…
Abstract
A method of processing information of a rotating wheel includes measuring angular velocity of a rotating wheel with a gyroscopic sensor, determining an instantaneous position of the rotating wheel with an accelerometer, and determining the angular positions of the rotating wheel based on the measured angular velocity and the instantaneous position of the rotating wheel. The gyroscopic sensor and the accelerometer are mounted on the rotating wheel.
Claims20
A method of processing information of a rotating wheel, the method comprising:
- measuring angular velocity of a rotating wheel with a gyroscopic sensor, the gyroscopic sensor being mounted on the rotating wheel;
- determining an instantaneous position of the rotating wheel with an accelerometer using a zero-crossing, the accelerometer being mounted on the rotating wheel, wherein determining the instantaneous position of the rotating wheel comprises:
- measuring, at the accelerometer, instantaneous values of acceleration along a first direction and a second direction perpendicular to the first direction;
- determining, from the measured instantaneous values, a value of acceleration resolved on a rotating plane of the rotating wheel, the rotating plane comprising the first and the second directions;
- and
- determining the instantaneous position of the rotating wheel when the value of acceleration resolved on the rotating plane passes through the zero-crossing;
- and
- determining the angular positions of the rotating wheel based on the measured angular velocity and the instantaneous position of the rotating wheel.
5 more elements
A vehicle comprising:
- a wheel configured to be rotated;
- a gyroscopic sensor coupled to the wheel;
- an accelerometer coupled to the wheel;
- and
- a controller connected to the gyroscopic sensor and the accelerometer, wherein the controller is configured to:
- take measurements of an angular velocity of the wheel with respect to time using the gyroscopic sensor;
- take measurements of gravitational acceleration of the wheel with respect to time using the accelerometer;
- and
- calculate an angular position of the wheel using the measurements of the angular velocity of the wheel with respect to time, wherein the controller corrects an angle error in the measurements of the angular position using a zero crossing in the measurements of the gravitational acceleration of the wheel to find an instantaneous position of the wheel, the controller being programmed to control the angle error to be within 5 degrees.
6 more elements
A display comprising:
- a wheel configured to be rotated around an axis perpendicular to a rotating plane;
- a plurality of light emitting circuits attached to the wheel;
- a gyroscopic sensor mounted on the wheel and configured to measure angular velocity of the wheel while the wheel is being rotated;
- an accelerometer mounted on the wheel and configured to measure acceleration of the wheel while the wheel is being rotated;
- and
- a controller programmed to:
- determine zero-crossings of a value of the acceleration resolved along the rotating plane;
- determine the angular position of the wheel based on the measured angular velocity and the zero-crossings;
- and
- set a display property of the plurality of light emitting circuits based on the angular position.
7 more elements
Dependencies are inferred from the claim text.