Automatic alignment of a vehicle three-axes accelerometer
First Claim
1. A method, implemented by one or more devices, comprising:
- receiving, by the one or more devices, acceleration measurements from a three axis accelerometer mounted in a vehicle;
determining, by the one or more devices and based on the acceleration measurements, a dominant orientation of the accelerometer in relation to gravity, the determination of the dominant orientation including calculating a first transformation angle and a second transformation angle as parameters to perform coordinate realignment of a coordinate frame of the accelerometer to a coordinate frame of the vehicle;
identifying, by the one or more devices and based on the acceleration measurements, an occurrence of acceleration events of the vehicle, each of the acceleration events including a plurality of acceleration measurements in which a magnitude of the plurality of acceleration measurements are greater than a threshold value;
determining, by the one or more devices and based on an analysis of the acceleration events, a third transformation angle as a parameter to perform coordinate realignment of the coordinate frame of the accelerometer to the coordinate frame of the vehicle; and
storing, by the one or more devices, the first, second, and third transformation angles.
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Accused Products
Abstract
The axes of an accelerometer, installed in a vehicle at an arbitrary orientation, may be realigned to the coordinate frame of the vehicle. In one implementation, a method may include determining, based on acceleration measurements from the accelerometer that likely corresponds to stopping, a dominant orientation of the accelerometer in relation to gravity, including calculating a first transformation angle and a second transformation angle as parameters to perform coordinate realignment of a coordinate frame of the accelerometer to a coordinate frame of the vehicle. The method may further include identifying, based on the acceleration measurements, an occurrence of acceleration events of the vehicle; determining, based on an analysis of the acceleration events, a third transformation angle; and storing the first, second, and third transformation angles.
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Citations
24 Claims
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1. A method, implemented by one or more devices, comprising:
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receiving, by the one or more devices, acceleration measurements from a three axis accelerometer mounted in a vehicle; determining, by the one or more devices and based on the acceleration measurements, a dominant orientation of the accelerometer in relation to gravity, the determination of the dominant orientation including calculating a first transformation angle and a second transformation angle as parameters to perform coordinate realignment of a coordinate frame of the accelerometer to a coordinate frame of the vehicle; identifying, by the one or more devices and based on the acceleration measurements, an occurrence of acceleration events of the vehicle, each of the acceleration events including a plurality of acceleration measurements in which a magnitude of the plurality of acceleration measurements are greater than a threshold value; determining, by the one or more devices and based on an analysis of the acceleration events, a third transformation angle as a parameter to perform coordinate realignment of the coordinate frame of the accelerometer to the coordinate frame of the vehicle; and storing, by the one or more devices, the first, second, and third transformation angles. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. A system comprising:
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a three axis accelerometer; and an analysis component to; receive acceleration measurements from the accelerometer; determine, based on the acceleration measurements, a dominant orientation of the accelerometer in relation to gravity, the determination of the dominant orientation including calculating a first transformation angle and a second transformation angle as parameters to perform coordinate realignment of a coordinate frame of the accelerometer to a coordinate frame of a vehicle in which the accelerometer is placed; identify occurrences of acceleration events of the vehicle; calculate, based on select ones of the acceleration events, a third transformation angle as a parameter to perform coordinate realignment of the coordinate frame of the accelerometer to the coordinate frame of the vehicle; calculate, based on one of the acceleration measurements and based on the first, second, and third transformation angles, a transformed value of the one of the acceleration measurements, the transformed value measuring acceleration relative to the coordinate frame of the vehicle; and output the transformed value. - View Dependent Claims (14, 15, 16, 17, 18, 19)
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20. A device comprising:
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an accelerometer to generate acceleration measurements; and an analysis component to; determine, based on the acceleration measurements, a dominant orientation of the accelerometer in relation to gravity, the determination of the dominant orientation including calculating a first transformation angle and a second transformation angle as parameters to perform coordinate realignment of a coordinate frame of the accelerometer to a coordinate frame of a vehicle; identify, based on the acceleration measurements, an occurrence of acceleration events of the vehicle, each of the acceleration events including a plurality of acceleration measurements; determine, based on an analysis of the acceleration events, a third transformation angle as a parameter to perform coordinate realignment of the coordinate frame of the accelerometer to the coordinate frame of the vehicle; and store the first, second, and third transformation angles. - View Dependent Claims (21, 22, 23, 24)
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Specification