Improper seatbelt usage detection

Patent metadata

Field	Value
Publication number	US-10889262-B2
Application number	US-201816209227-A
Country	US
Kind code	B2
Filing date	Dec 4, 2018
Priority date	Dec 6, 2017
Publication date	Jan 12, 2021
Grant date	Jan 12, 2021

Abstract

A system for detecting improper usage of a seatbelt of a vehicle includes a vehicle seat having a seat cushion and a seat back. A shoulder belt and a lap belt are intended to restrain an occupant sitting on the vehicle seat. The system includes a sensor module associated with the shoulder belt and the lap belt. The sensor module generates signals indicative of at least one parameter associated with the vehicle seat, the shoulder belt, and the lap belt when the occupant is sitting on the vehicle seat. The system also includes a controller that receives the signals indicative of the at least one parameter associated with the seat back, the shoulder belt, and the lap belt. The controller analyzes the received one or more signals, and determines whether the seatbelt is being used improperly by the occupant, based on the analysis.

First claim

What is claimed is:

1. A system for detecting improper usage of a seatbelt of a vehicle, the system comprising:
a vehicle seat having a seat cushion and a seat back;
a shoulder belt and a lap belt, wherein the shoulder belt and lap belt are intended to restrain an occupant sitting on the vehicle seat;
a first sensor module associated with the shoulder belt and the lap belt, the first sensor module configured to generate one or more signals indicative of at least one parameter associated with the vehicle seat in combination with the occupant sitting on the vehicle seat;
a second sensor module associated with the vehicle seat, the second sensor module configured to generate one or more signals indicative of at least one parameter associated with the vehicle seat in combination with the occupant sitting on the vehicle seat;
a controller configured to:
receive the one or more signals from the first sensor module and the second sensor module;
analyze the received one or more signals from the first sensor module and the second sensor module; and
determine whether the seatbelt is being used improperly by the occupant, based on the analysis.

2. The system of claim 1 , wherein the sensor module comprises a capacitance sensor.

3. The system of claim 2 , wherein the capacitance sensor is a mutual capacitance sensor formed between the seat back and the shoulder belt.

4. The system of claim 3 , wherein the mutual capacitance sensor is formed in part by using a conductive material within the seat back.

5. The system of claim 3 , wherein the mutual capacitance sensor is formed in part by using a conductive material integrated within the shoulder belt.

6. The system of claim 1 , wherein the sensor module comprises a self-capacitance sensor formed using the seat back.

7. The system of claim 6 , wherein the sensor module further comprises self-capacitance sensor using the shoulder belt.

8. The system of claim 6 , wherein the sensor module further comprises self-capacitance sensor using the lap belt.

9. The system of claim 5 , wherein the controller is further configured to:
compare a calculated mutual capacitance with a threshold value; and
determine improper usage of the seatbelt by the occupant, if the calculated mutual capacitance exceeds the threshold value.

10. The system of claim 9 , wherein the threshold value is pre-determined based on an occupant profile.

11. The system of claim 1 , wherein the sensor module is an inertial sensor module.

12. The system of claim 11 , wherein the one or more signals indicative of at least one parameter include signals indicative of a spatial orientation of the shoulder belt.

13. The system of claim 12 , wherein the controller is further configured to:
receive the signals indicative of the spatial orientation of the shoulder belt;

determine an orientation profile of the shoulder belt based on the received signals; and
determine whether the seatbelt is being used improperly by the occupant, based on the determined orientation profile.

14. The system of claim 13 , wherein the controller is further configured to:
compare the orientation profile of the shoulder belt with a pre-stored orientation profile of the shoulder belt, wherein the pre-stored orientation profile corresponds to a proper usage of the seatbelt; and
determine improper usage of the seatbelt by the occupant, based on the comparison.

15. A system for detecting an improper usage of a seatbelt of a vehicle, the system comprising:
a vehicle seat having a seat cushion and a seat back;
a shoulder belt and a lap belt, wherein the shoulder belt and the lap belt are intended to restrain an occupant sitting on the vehicle seat;
a first capacitance sensor disposed with the seat back, wherein the first capacitance sensor is configured to generate a first signal indicative of self capacitance measured at the seat back when the occupant is sitting on the vehicle seat;
a second capacitance sensor disposed with the shoulder belt, wherein the second sensor is configured to generate a second signal indicative of self capacitance measured at the shoulder belt when the occupant is sitting on the vehicle seat;
a controller configured to:
receive the first signal indicative of self capacitance measured at the seat back;
receive the second signal indicative of self capacitance measured at the shoulder belt;
compare the first signal and the second signal; and
determine the improper usage of the seatbelt by the occupant based on the comparison.

16. The system of claim 15 , wherein the controller is further configured to:
calculate a difference between the first signal and the second signal; and compare the calculated difference with a threshold value; and
determine improper usage of the seatbelt by the occupant, if the calculated difference exceeds the threshold value.

17. The system of claim 16 , wherein the threshold difference value is pre-determined based on an occupant profile.

18. The system of claim 15 , wherein the first capacitance sensor is integrated within a fabric of the seat back.

19. The system of claim 15 , wherein the second capacitance sensor is integrated within a fabric of the shoulder belt.

20. A system for detecting an improper usage of a seatbelt of a vehicle, the system comprising:
a vehicle seat;
a shoulder belt and a lap belt, wherein the shoulder belt and lap belt are intended to restrain an occupant sitting on the vehicle seat;
an inertial measurement sensor associated with the shoulder belt, wherein the inertial measurement sensor generates a first signal indicative of a spatial orientation of the shoulder belt when the occupant is sitting on the vehicle seat;
a capacitance sensor disposed with the seat back, wherein the capacitance sensor is configured to generate a second signal indicative of self capacitance measured at the seat back when the occupant is sitting on the vehicle seat; and
a controller configured to:
receive the first signals indicative of the spatial orientation of the shoulder belt;
receive the second signals indicative of self capacitance measured at the seat back;
determine an orientation profile of the shoulder belt based on the received first signals; and
determine whether the seatbelt is being used improperly by the occupant, based on the determined orientation profile and the received second signals.

21. The system of claim 20 , wherein the controller is further configured to:
compare the orientation profile of the shoulder belt with a pre-stored orientation profile of the shoulder belt; and
determine improper usage of the seatbelt by the occupant, based on the comparison.

22. The system of claim 21 , wherein the pre-stored orientation profile corresponds to a proper usage of the seatbelt.

Assignees

• Tesla Inc

Inventors

• Liau Forrest Wen

Classifications

• B60N2/002

  Seats provided with an occupancy detection means mounted therein or thereon (detection means responsive to presence or absence of children B60N2/266) · CPC title

• B60R2022/4808

  Sensing means arrangements therefor · CPC title

• B60R21/01532

  using electric or capacitive field sensors · CPC title

• B60R2022/4891

  preventing use of the vehicle when the seatbelt is not fastened · CPC title

• B60R2022/485

  for sensing belt anchor position, belt orientation, or the like · CPC title