Occupant position detection with active electric field sensor

Patent metadata

Field	Value
Publication number	US-11254238-B2
Application number	US-201916571851-A
Country	US
Kind code	B2
Filing date	Sep 16, 2019
Priority date	Sep 16, 2019
Publication date	Feb 22, 2022
Grant date	Feb 22, 2022

Abstract

A vehicle seating assembly comprises a seat including a back having an array of at least two electrodes arranged in the back such that a master electrode has an electric field being greater than an electric field of each of the other electrodes within the array to detect a total change in capacitance from the array. A controller is responsive to a change in capacitance calculated from the master electrode being greater than a first threshold and each of the other electrodes in the array being greater than a second threshold and outputs occupant movement data indicative of a first status of the seat to a vehicle control sub-system.

First claim

What is claimed is:

1. A vehicle seating assembly, comprising:
a seat including a back having an array of at least two electrodes arranged in the back such that a master electrode has an electric field being greater than an electric field of each of the other electrodes within the array to detect a total change in capacitance from the array;
a controller that outputs occupant movement data indicative of a first status of the seat if the total change in capacitance is greater than a first threshold;
wherein the controller outputs occupant movement data being indicative of a second status of the seat if the master electrode has a change in capacitance being less than a second threshold and each of the other electrodes has a change in capacitance being less than the first threshold; and
wherein the first status of the seat is indicative of the master electrode having a change in capacitance being greater than the second threshold and each of the other electrodes having a change in capacitance being greater than the first threshold.

2. The vehicle seating assembly of claim 1 , wherein the controller transmits the status to a vehicle control sub-system.

3. The vehicle seating assembly of claim 1 , wherein the controller outputs occupant movement data being indicative of a third status of the seat if at least one electrode disposed on a first side of the array of the plurality of electrodes has a change in capacitance being greater than a change in capacitance of at least one electrode disposed on a second side of the array of the plurality of electrodes.

4. The vehicle seating assembly of claim 3 , wherein the controller outputs occupant movement data being indicative of a fourth status of the seat if at least one electrode disposed on a first side of the array of the plurality of electrodes has a change in capacitance being less than a change in capacitance of at least one electrode disposed on a second side of the array of the plurality of electrodes.

5. A vehicle comprising:
a seating assembly having a plurality of electrodes disposed in an array, and including a master electrode having an electric field being greater than each of the other electrodes in the plurality of electrodes; and
a controller that outputs occupant movement data indicative of a first status of the seat if a change in capacitance calculated from the master electrode is greater than a second threshold and each of the other electrodes in the plurality of electrodes has a change in capacitance greater than a first threshold;
wherein the plurality of electrodes is arranged symmetrically across a seating assembly centerline; and
wherein the controller outputs occupant movement data being indicative of a second status of the seat if the master electrode has a change in capacitance being less than the second threshold and each of the other electrodes has a change in capacitance being less than the first threshold.

6. The vehicle as claimed in claim 5 , wherein the controller outputs occupant movement data being indicative of a third status of the seat if at least one electrode disposed on a first side of the array of the plurality of electrodes has a change in capacitance being greater than a change in capacitance of at least one electrode disposed on a second side of the array of the plurality of electrodes.

7. The vehicle as claimed in claim 5 , wherein the controller outputs occupant movement data being indicative of a fourth status of the seat if at least one electrode disposed on a first side of the array of the plurality of electrodes has a change in capacitance being less than a change in capacitance of at least one electrode disposed on a second side of the array of the plurality of electrodes.

8. The vehicle as claimed in claim 7 , wherein the first and second sides of the array are oppositely orientated across a vertical centerline.

9. The vehicle as claimed in claim 5 , wherein the plurality of electrodes is arranged symmetrically across a seat centerline.

10. A method for controlling a vehicle sub-system comprising:
receiving occupant movement data from a seating assembly having a plurality of electrodes including a master electrode having an electric field being greater than each of the other electrodes in the plurality of electrodes being disposed in an array in a back portion of the seating assembly;
calculating, via a controller, a status of the seating assembly based on a change in capacitance calculated from the master electrode being greater than a second threshold and a change in capacitance from each of the other electrodes in the plurality of electrodes being greater than a first threshold; and
calculating, via the controller, responsive to the master electrode having a change in capacitance being less than the second threshold and each of the other electrodes having a change in capacitance being less than the first threshold, occupant movement data being indicative of a second status of the seating assembly; and
transmitting the status of the seating assembly to a vehicle control sub-system.

11. The method of claim 10 further comprising calculating, via the controller, responsive to at least one electrode disposed on a first side of the array of the plurality of electrodes having a change in capacitance being greater than a change in capacitance of at least one electrode disposed on a second side of the array of the plurality of electrodes, occupant movement data being indicative of a third status of the seating assembly.

12. The method of claim 10 further comprising calculating, via the controller, responsive to at least one electrode disposed on a first side of the array of the plurality of electrodes having a change in capacitance being less than a change in capacitance of at least one electrode disposed on a second side of the array of the plurality of electrodes, occupant movement data being indicative of a fourth status of the seat.

13. The method of claim 10 further comprising transmitting the status of the seating assembly to at least one additional vehicle control sub-system.

14. The method of claim 10 , wherein the second threshold is greater than the first threshold.

Assignees

• Ford Global Tech Llc

Inventors

• Lin Jun
• Le Jialiang
• Szawarski Hubert

Classifications

• G01V3/088 Primary

  operating with electric fields (G01V3/082 takes precedence) · CPC title

• B60N2/0027 Primary

  for detecting the position of the occupant or of occupant's body part · CPC title

• B60N2210/12

  Capacitive; Electric field · CPC title

• B60N2/0021

  characterised by the type of sensor or measurement · CPC title

• B60R21/01532 Primary

  using electric or capacitive field sensors · CPC title