METHODS AND SYSTEMS FOR ALIGNING A MOBILE DEVICE TO A VEHICLE

• US 20150369836A1
• Filed: 06/24/2015
• Published: 12/24/2015
• Est. Priority Date: 06/24/2014
• Status: Active Grant

• Current Assignee: Cambridge Mobile Telematics, Inc.
• Original Assignee: Censio, LLC
• Inventors: Cordova, Brad, Sahoo, Sanujit
• Granted Patent: US 10,078,099 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: B60W 40/09 Driving style or behaviour
• CPC Class Codes: G01P 15/18 in two or more dimensions

Abstract

A method of determining vehicle acceleration information includes obtaining a plurality of movement measurements from a mobile device in a vehicle, and determining a plurality of gravity vectors, each of the plurality of gravity vectors associated with at least two of the plurality of movement measurements. The method further includes removing a movement measurement from the plurality of movement measurements using the plurality of gravity vectors to provide a set of remaining movement measurements. An acceleration measurement for the vehicle is determined using the remaining movement measurements.

Claims

1. A method of determining vehicle acceleration information, the method comprising:

obtaining a plurality of movement measurements from a mobile device in a vehicle;

determining a plurality of gravity vectors, each of the plurality of gravity vectors associated with at least two of the plurality of movement measurements;

removing a movement measurement from the plurality of movement measurements using the plurality of gravity vectors to provide a set of remaining movement measurements; and

determining an acceleration measurement for the vehicle using the remaining movement measurements.

2. The method of claim 1, wherein at least one of the plurality of gravity vectors is associated with an accelerometer measurement from the mobile device.

3. The method of claim 1, wherein at least one of the plurality of gravity vectors is associated with a gyroscope measurement from the mobile device.

4. The method of claim 1, wherein the removed movement measurement is associated with a change in position of the mobile device within the vehicle.

5. The method of claim 1, wherein determining a plurality of gravity vectors comprises:

determining a first and second gravity vector over a time span;

determining that a change between the first and second gravity vectors over the time span is above a threshold; and

wherein removing a movement measurement from the plurality of movement measurements includes removing a movement measurement associated with the time span.

6. The method of claim 1, further comprising, determining at least one gravity vector using quaternions.

7. A system for determining vehicle acceleration information, the system comprising:

a processor;

a memory, having instructions stored thereon, that, when executed by the processor, cause the processor to perform operations, the operations comprising;

obtaining a plurality of movement measurements from a mobile device in a vehicle;

determining a plurality of gravity vectors, each of the plurality of gravity vectors associated with at least two of the plurality of movement measurements;

removing a movement measurement from the plurality of movement measurements using the plurality of gravity vectors to provide a set of remaining movement measurements; and

determining an acceleration measurement for the vehicle using the remaining movement measurements.

8. The system of claim 7, wherein at least one of the plurality of gravity vectors is associated with an accelerometer measurement from the mobile device.

9. The system of claim 7, wherein at least one of the plurality of gravity vectors is associated with a gyroscope measurement from the mobile device.

10. The system of claim 7, wherein the removed movement measurement is associated with a change in position of the mobile device within the vehicle.

11. The system of claim 7, wherein determining a plurality of gravity vectors comprises:

determining a first and second gravity vector over a time span;

determining that a change between the first and second gravity vectors over the time span is above a threshold; and

wherein removing a movement measurement from the plurality of movement measurements includes removing a movement measurement associated with the time span.

12. The system of claim 7, further comprising, determining at least one gravity vector using quaternions.

13. A non-transitory computer readable storage medium having instructions stored thereon, that, when executed by a processor, cause the processor to perform operations comprising:

obtaining a plurality of movement measurements from a mobile device in a vehicle;

determining a plurality of gravity vectors, each of the plurality of gravity vectors associated with at least two of the plurality of movement measurements;

removing a movement measurement from the plurality of movement measurements using the plurality of gravity vectors to provide a set of remaining movement measurements; and

determining an acceleration measurement for the vehicle using the remaining movement measurements.

14. The non-transitory computer readable storage medium of claim 13, wherein at least one of the plurality of gravity vectors is associated with an accelerometer measurement from the mobile device.

15. The non-transitory computer readable storage medium of claim 13, wherein at least one of the plurality of gravity vectors is associated with a gyroscope measurement from the mobile device.

16. The non-transitory computer readable storage medium of claim 13, wherein the removed movement measurement is associated with a change in position of the mobile device within the vehicle.

17. The non-transitory computer readable storage medium of claim 13, wherein determining a plurality of gravity vectors comprises:

determining a first and second gravity vector over a time span;

determining that a change between the first and second gravity vectors over the time span is above a threshold; and

wherein removing a movement measurement from the plurality of movement measurements includes removing a movement measurement associated with the time span.

18. The non-transitory computer readable storage medium of claim 13, further comprising, determining at least one gravity vector using quaternions.