Granted Patent B1

US 11,731,469 · App. 17/659,010 · Granted Aug 22, 2023

Inventor: Glen Phillip McGillan (San Francisco, CA)

Assignee: Samsara, Inc.

B60C23/0488B60C11/243B60C23/0479B60C23/0489B60C23/061B60C23/20B60C2200/04

Abstract

Claims (62)

1. A method performed by an electronic device to monitor one or more wheels of a vehicle, the method comprising:

receiving first accelerometer measurements of a first accelerometer mounted on the vehicle's first wheel when the vehicle is moving during an interval of time;

determining based on the first accelerometer measurements a first path followed by the first accelerometer when the vehicle is moving during the interval of time;

receiving second accelerometer measurements of a second accelerometer mounted on a vehicle's second wheel when the vehicle is moving during the interval of time;

determining, based on the second accelerometer measurements, a second path followed by the second accelerometer when the vehicle is moving during the interval of time;

determining based on a comparison of the first path with the second path that at least one of the vehicle's first wheel and the vehicle's second wheel is misaligned; and

responsive to the at least one of the vehicle's first wheel and the vehicle's second wheel being misaligned, transmitting to a user device a first alert indicating the misalignment of at least one of the vehicle's first wheel and the vehicle's second wheel.

2. The method of claim 1 , wherein the comparison of the first path with the second path includes:

determining a subinterval of the interval of time during which the vehicle is not turning; and

determining, based on accelerometer measurements recorded during the subinterval of the interval of time, a difference between a first portion of the first path and a second portion of the second path, wherein the first portion is followed by the vehicle's first wheel during the subinterval of the interval of time and the second portion is followed by the vehicle's second wheel during the subinterval of the interval of time.

3. The method of claim 1 , further comprising:

receiving third accelerometer measurements of a third accelerometer mounted on the vehicle's third wheel when the vehicle is moving during the interval of time; and

determining based on the third accelerometer measurements a third path followed by the third accelerometer when the vehicle is moving during the interval of time.

4. The method of claim 3 , wherein the vehicle's first wheel is determined as not being properly aligned based on the first path being different from the second path and the third path but the second path and the third path being substantially identical.

5. The method of claim 1 , wherein the first alert indicates which of the vehicle's wheels is misaligned.

6. The method of claim 1 , wherein the comparison of the first path with the second path includes:

identifying portions of the first path and the second path that are expected to be substantially identical.

7. The method of claim 1 , wherein the comparison of the first path with the second path includes:

identifying whether the vehicle's first wheel is a front wheel or a back wheel; and

identifying whether the vehicle's second wheel is a front wheel or a back wheel.

8. The method of claim 7 , wherein the vehicle's first wheel is identified as being a front wheel or a back wheel based on comparing a movement of the vehicle's first wheel over time or comparing a distance traveled by vehicle's first wheel.

9. The method of claim 1 , further comprising:

receiving third accelerometer measurements of the first accelerometer when the vehicle is moving during a first interval of time;

determining based on the third accelerometer measurements a third path followed by the first accelerometer when the vehicle is moving during the first interval of time;

receiving fourth accelerometer measurements of the first accelerometer when the vehicle is moving during a second interval of time;

determining based on the fourth accelerometer measurements a fourth path followed by the first accelerometer when the vehicle is moving during the second interval of time; and

determining, based on a comparison of the third path with the fourth path that the vehicle's first wheel is misaligned.

10. The method of claim 1 , further comprising:

receiving pressure measurements of the vehicle's first wheel recorded during the interval of time;

determining, based on the first accelerometer measurements and the pressure measurements, a circumference of the vehicle's first wheel at a first time;

determining that the circumference of the vehicle's first wheel is less than a circumference threshold; and

responsive to determining that the circumference is less than the circumference threshold, transmitting to the user device a second alert indicating that a tread depth of a tire of the vehicle's first wheel has decreased.

11. The method of claim 10 , further comprising:

determining based on the first path that the vehicle's first wheel is out of balance with respect to an axle of the vehicle's first wheel; and

responsive to determining that the vehicle's first wheel is out of balance, transmitting to the user device a third alert that the vehicle's first wheel is out of balance.

12. A non-transitory machine-readable storage medium that provides instructions that, if executed by a processor of an electronic device will cause said electronic device to perform operations for monitoring one or more wheels of a vehicle, the operations comprising:

receiving first accelerometer measurements of a first accelerometer mounted on the vehicle's first wheel when the vehicle is moving during an interval of time;

determining based on the first accelerometer measurements a first path followed by the first accelerometer when the vehicle is moving during the interval of time;

receiving second accelerometer measurements of a second accelerometer mounted on a vehicle's second wheel when the vehicle is moving during the interval of time;

determining, based on the second accelerometer measurements, a second path followed by the second accelerometer when the vehicle is moving during the interval of time;

determining based on a comparison of the first path with the second path that at least one of the vehicle's first wheel and the vehicle's second wheel is misaligned; and

responsive to the at least one of the vehicle's first wheel and the vehicle's second wheel not being properly aligned, transmitting to a user device a first alert indicating the misalignment of at least one of the vehicle's first wheel and the vehicle's second wheel.

13. The non-transitory machine-readable storage medium of claim 12 , wherein the comparison of the first path with the second path includes:

determining a subinterval of the interval of time during which the vehicle is not turning; and

determining, based on accelerometer measurements recorded during the subinterval of the interval of time, a difference between a first portion of the first path and a second portion of the second path, wherein the first portion is followed by the vehicle's first wheel during the subinterval of the interval of time and the second portion is followed by the vehicle's second wheel during the subinterval of the interval of time.

14. The non-transitory machine-readable storage medium of claim 12 , wherein the operations further comprise:

receiving third accelerometer measurements of a third accelerometer mounted on the vehicle's third wheel when the vehicle is moving during the interval of time; and

determining based on the third accelerometer measurements a third path followed by the third accelerometer when the vehicle is moving during the interval of time.

15. The non-transitory machine-readable storage medium of claim 14 , wherein the vehicle's first wheel is determined as not being properly aligned based on the first path being different from the second path and the third path but the second path and the third path being substantially identical.

16. The non-transitory machine-readable storage medium of claim 12 , wherein the first alert indicates which of the vehicle's wheels is misaligned.

17. The non-transitory machine-readable storage medium of claim 12 , wherein the comparison of the first path with the second path includes:

identifying portions of the first path and the second path that are expected to be substantially identical.

18. The non-transitory machine-readable storage medium of claim 12 , wherein the comparison of the first path with the second path includes:

identifying whether the vehicle's first wheel is a front wheel or a back wheel; and

identifying whether the vehicle's second wheel is a front wheel or a back wheel.

19. The non-transitory machine-readable storage medium of claim 18 , wherein the vehicle's first wheel is identified as being a front wheel or a back wheel based on comparing a movement of the vehicle's first wheel over time or comparing a distance traveled by vehicle's first wheel.

20. The non-transitory machine-readable storage medium of claim 12 , wherein the operations further comprise:

receiving third accelerometer measurements of the first accelerometer when the vehicle is moving during a first interval of time;

determining based on the third accelerometer measurements a third path followed by the first accelerometer when the vehicle is moving during the first interval of time;

receiving fourth accelerometer measurements of the first accelerometer when the vehicle is moving during a second interval of time;

determining based on the fourth accelerometer measurements a fourth path followed by the first accelerometer when the vehicle is moving during the second interval of time; and

determining, based on a comparison of the third path with the fourth path that the vehicle's first wheel is misaligned.

Assignments (2)

Continuity (2)

Cited By (34)

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