Calibrating sensor unit orientation for use in a vehicle monitoring system
First Claim
1. A system configured to calibrate orientation of an accelerometer in a vehicle that includes a sensor set, wherein the sensor set is configured to generate output signals conveying vectors of acceleration of the vehicle, wherein the sensor set has a three-dimensional orientation in relation to the vehicle, the system configured to couple with the vehicle, the system comprising:
- one or more processors configured to;
determine a gravity vector, wherein the determination of the gravity vector is based on the output signals generated by the sensor set, and wherein the determination of the gravity vector is further based on a determination that the vehicle is stopped;
perform a comparison of a rate of acceleration of the vehicle with a threshold level of acceleration to determine whether a magnitude of the rate of acceleration of the vehicle has exceeded the threshold level of acceleration such that the magnitude of the rate of acceleration of the vehicle is sufficient to assume the vehicle is not turning left or right but moving straight;
determine the vehicle is longitudinally accelerating and not turning left or right, wherein the determination is based on the comparison of the rate of acceleration of the vehicle with the threshold level of acceleration, wherein the magnitude of the rate of acceleration of the vehicle has exceeded the threshold level of acceleration;
subsequent to the determination that the vehicle is longitudinally accelerating, determine a longitudinal vector of the vehicle based on the generated output signals; and
determine the three-dimensional orientation of the sensor set in relation to the vehicle, wherein determination of the three-dimensional orientation is based on the gravity vector and the longitudinal vector.
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Accused Products
Abstract
This disclosure relates to a system and method for calibrating sensors upon installation in a vehicle. The system includes a sensor set configured to generate output signals conveying vectors of acceleration of the vehicle. The system determines a three-dimensional orientation of the sensor set in relation to the vehicle. The system converts output signals from the sensor set into vectors of acceleration of the vehicle.
15 Citations
20 Claims
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1. A system configured to calibrate orientation of an accelerometer in a vehicle that includes a sensor set, wherein the sensor set is configured to generate output signals conveying vectors of acceleration of the vehicle, wherein the sensor set has a three-dimensional orientation in relation to the vehicle, the system configured to couple with the vehicle, the system comprising:
one or more processors configured to; determine a gravity vector, wherein the determination of the gravity vector is based on the output signals generated by the sensor set, and wherein the determination of the gravity vector is further based on a determination that the vehicle is stopped; perform a comparison of a rate of acceleration of the vehicle with a threshold level of acceleration to determine whether a magnitude of the rate of acceleration of the vehicle has exceeded the threshold level of acceleration such that the magnitude of the rate of acceleration of the vehicle is sufficient to assume the vehicle is not turning left or right but moving straight; determine the vehicle is longitudinally accelerating and not turning left or right, wherein the determination is based on the comparison of the rate of acceleration of the vehicle with the threshold level of acceleration, wherein the magnitude of the rate of acceleration of the vehicle has exceeded the threshold level of acceleration; subsequent to the determination that the vehicle is longitudinally accelerating, determine a longitudinal vector of the vehicle based on the generated output signals; and determine the three-dimensional orientation of the sensor set in relation to the vehicle, wherein determination of the three-dimensional orientation is based on the gravity vector and the longitudinal vector. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method to calibrate orientation of an accelerometer in a vehicle that includes a sensor set, wherein the sensor set generates output signals conveying vectors of acceleration of the vehicle, wherein the sensor set has a three-dimensional orientation in relation to the vehicle, the method comprising:
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determining a gravity vector, wherein the determination of the gravity vector is based on the output signals generated by the sensor set, and wherein the determination of the gravity vector is further based on a determination that the vehicle is stopped; performing a comparison of a rate of acceleration of the vehicle with a threshold level of acceleration to determine whether a magnitude of the rate of acceleration of the vehicle has exceeded the threshold level of acceleration such that the magnitude of the rate of acceleration of the vehicle is sufficient to assume the vehicle is not turning left or right but moving straight; determining the vehicle is longitudinally accelerating and not turning left or right, wherein the determination is based on the comparison of the rate of acceleration of the vehicle with the threshold level of acceleration, wherein the magnitude of the rate of acceleration of the vehicle has exceeded the threshold level of acceleration; subsequent to the determination that the vehicle is longitudinally accelerating, determining a longitudinal vector of the vehicle based on the generated output signals; and determining the three-dimensional orientation of the sensor set in relation to the vehicle, wherein determining the three-dimensional orientation is based on the gravity vector and the longitudinal vector. - View Dependent Claims (18, 19, 20)
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Specification