Automatic headrest adjustment control system for a vehicle seat assembly

• US 20030090133A1
• Filed: 10/25/2002
• Published: 05/15/2003
• Est. Priority Date: 10/30/2001
• Status: Active Grant

• Current Assignee: Lear Corporation
• Original Assignee: Lear Corporation
• Inventors: Nathan, John F., Hein, David A.
• Granted Patent: US 7,145,263 B2
• Time in Patent Office: Days
• US Class Current: 297/217.3
• CPC Class Codes: B60N 2/002 Seats provided with an occupancy detection means mounted therein or thereon detection means responsive to presence or absence of children B60N2/266
• CPC Class Codes: B60N 2/0224 Non-manual adjustments, e.g. with electrical operation
• CPC Class Codes: B60N 2/0268 using sensors or detectors for adapting the seat or seat part, e.g. to the position of an occupant
• CPC Class Codes: B60N 2/829 characterised by their adjusting mechanisms, e.g. electric motors
• CPC Class Codes: B60N 2/832 movable to an inoperative or stowed position
• CPC Class Codes: B60N 2/853 characterised by their adjusting mechanisms, e.g. electric motors
• CPC Class Codes: B60N 2/856 movable to an inoperative or stowed position

Abstract

A control system and method for automatically adjusting the position of a headrest of a seat assembly for a vehicle. The control system includes at least one occupancy sensor disposed within the seat assembly for detecting the presence of a passenger in the seat assembly and at least one passenger position sensor disposed proximate to the headrest for detecting the position of a passenger'"'"'s head relative to the position of the headrest. A control module monitors the output of the at least one occupancy and position sensors and generates a control signal instructing the at least one drive motor to reposition the headrest to adjust to the presence and position of the passenger in the seat.

Claims

1. A control system for automatically adjusting the position of a headrest of a vehicle seat assembly, the control system comprising:

at least one occupancy sensor adapted to be disposed in the seat assembly for detecting the presence of a passenger in the seat assembly;

at least one passenger position sensor adapted to be disposed proximate to the headrest for detecting the position of a passenger'"'"'s head relative to the position of the headrest;

a control module configured to communicate with the at least one occupancy sensor and the at least one passenger position sensor for receiving output signals, wherein the control module is configured to interpret output signals generated by the sensors and to generate a control signal to position the headrest; and

at least one drive motor adapted to be operatively connected to the headrest for positioning the headrest based on the control signal received from the control module.

2. The control system of claim 1 wherein the at least one occupancy sensor comprises a sensor adapted to be disposed in a seat bottom cushion of the seat assembly for detecting the presence of a passenger in the seat assembly.

3. The control system of claim 1 wherein the at least one occupancy sensor comprises a sensor adapted to be disposed in a seat back cushion of the seat assembly for detecting the presence of a passenger in the seat assembly.

4. The control system of claim 1 wherein the at least one passenger position sensor comprises a sensor adapted to be disposed within the headrest for detecting the proximity of the passenger'"'"'s head to the headrest.

5. The control system of claim 1 wherein the at least one passenger position sensor comprises at least one sensor adapted to be mounted in a headliner of the vehicle above the headrest for detecting the proximity of the passenger'"'"'s head to the headrest.

6. The control system of claim 1 further comprising at least one load sensor configured to communicate with the control module for monitoring the at least one drive motor and for detecting a pinch condition during the positioning of the headrest.

7. The control system of claim 1 wherein the control module is configured to generate an output signal instructing the at least one drive motor to position the headrest in proximity to the passenger'"'"'s head based on output received from the at least one passenger position sensor if the at least one occupancy sensor detects the presence of the passenger in the seat assembly.

8. The control system of claim 1 wherein the control module is configured to generate an output signal instructing the at least one drive motor to position the headrest in a stored position if the at least one occupancy sensor does not detect the presence of the passenger in the seat assembly.

9. A seat assembly for use in a passenger compartment of a vehicle, the seat assembly comprising:

a seat bottom;

a seat back mounted to the seat bottom;

a headrest adjustably connected to and disposed adjacent an upper portion of the seat back; and

an automatic headrest adjustment control system, the control system including

at least one occupancy sensor disposed within the seat bottom for detecting the presence of a passenger in the seat assembly,

at least one passenger position sensor disposed proximate to the headrest for detecting the position of a passenger'"'"'s head relative to the position of the headrest,

a control module in communication with the at least one occupancy sensor and the at least one passenger position sensor for receiving output signals of the sensors, wherein the control module generates a control signal to position the headrest based on the output signals, and

at least one drive motor operatively connected to the headrest for positioning the headrest based on the control signal received from the control module.

10. The seat assembly of claim 9 further comprising at least one load sensor in communication with the control module for monitoring the at least one drive motor and detecting a pinch condition during the positioning of the headrest.

11. The seat assembly of claim 9 wherein the at least one occupancy sensor of the control system comprises a single sensor mat extending through and across multiple adjacent seat bottom cushions to detect the presence of a passenger in the seat assembly.

12. The seat assembly of claim 9 wherein the control system further comprises an ignition sensor configured to communicate with the control module for monitoring the ignition condition of the vehicle.

13. The seat assembly of claim 9 wherein the control system further comprises a door open sensor configured to communicate with the control module for monitoring the condition of the vehicle doors.

14. The seat assembly of claim 9 wherein the at least one passenger position sensor comprises a sensor disposed within the headrest for detecting the position of the passenger'"'"'s head in proximity to the headrest.

15. The seat assembly of claim 9 wherein the at least one passenger position sensor comprises at least one sensor adapted to be mounted in a headliner of the vehicle above the headrest for detecting the position of the passenger'"'"'s head in proximity to the headrest.

16. The seat assembly of claim 9 wherein the control module generates an output signal instructing the at least one drive motor to position the headrest in proximity to the passenger'"'"'s head based on output received from the at least one passenger position sensor if the at least one occupancy sensor detects the presence of the passenger in the seat assembly, the ignition sensor detects an active condition and the door open sensor detects a closed position.

17. The seat assembly of claim 9 wherein the control module generates an output signal instructing the at least one drive motor to position the headrest in a stored position if the at least one occupancy sensor does not detect the presence of the passenger in the seat assembly.

18. A method of automatically adjusting the position of a headrest of a vehicle seat assembly, the method comprising:

monitoring output signals from at least one occupancy sensor and at least one passenger position sensor to detect the presence and position of a passenger in the vehicle seat assembly;

generating a control signal based on the output signals for instructing at least one drive motor to position the headrest; and

positioning the headrest with the at least one drive motor based on the control signal between at least one position in proximity to the passenger'"'"'s head and a stored position.

19. The method of claim 18 further comprising the step of monitoring the at least one drive motor for detecting a pinch condition during the positioning of the headrest.

20. The method of claim 18 further comprising the step of monitoring the ignition condition of the vehicle, wherein the step of generating the control signal includes generating the control signal based on the ignition condition detected by an ignition sensor.

21. The method of claim 18 further comprising the step of monitoring the position of a vehicle door, wherein the step of generating the control signal includes generating the control signal based on the position of the vehicle door detected by at least one door open sensors.