Adaptive seating system

• US 6,055,473 A
• Filed: 02/19/1997
• Issued: 04/25/2000
• Est. Priority Date: 02/19/1997
• Status: Expired due to Term

• Current Assignee: Autoliv AB (Autoliv Incorporated)
• Original Assignee: General Motors Corporation (Motors Liquidation Co. GUC Trust)
• Inventors: Dong, Yibing, Oleszko, Mark Allan, Xu, Liwen, Zwolinski, Joseph John, Anahid, Hassan
• Primary Examiner(s): Cuchlinski, Jr., William A.
• Assistant Examiner(s): Donnelly, Arthur D.
• Application Number:
  US08/801,218
• Time in Patent Office: 1,161 Days
• Field of Search: 364/558, 701/20, 701/45, 701/49, 248/558, 296/65.1
• US Class Current: 701/49
• 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 2/665 using inflatable bladders
• CPC Class Codes: B60N 2/80 Head-rests
• CPC Class Codes: B60N 2/885 provided with side-rests
• CPC Class Codes: B60N 2/914 Hydro-pneumatic adjustments of the shape
• CPC Class Codes: B60N 2/99 adjustable
• CPC Class Codes: B60R 21/01516 using force or pressure sensing means
• CPC Class Codes: G01G 19/4142 for controlling activation of safety devices, e.g. airbag systems electrical circuits for triggering safety arrangements in case of vehicle accidents B60R21/015
• CPC Class Codes: G01G 5/045 combined with means for totalising the pressure imposed by several load-cells

Abstract

Adaptive seating comfort control automatically senses occupation of a seat, estimates attributes of the seat occupant, and generates and issues seating comfort control commands in response to the occupant attributes to provide for maximum seating comfort and to provide for a desired interaction with other control systems. Comfort control commands take the form of desired pressure commands for at least one fluid filled bladder within the seat and may be updated periodically during a period of seat occupation to account for change in position of the seat occupant or to reduce occupant muscle fatigue.

Claims

1. An automatic seating comfort control system, comprising:

a seat having a plurality of bladders disposed therein;

a fluid pressure control system for controlling passage of a fluid into and out of selected ones of the plurality of bladders;

at least one pressure transducer for transducing fluid pressure within the fluid pressure control system into at least one corresponding pressure signal; and

a controller for receiving the pressure signal and for estimating seat occupant dimension information as a function of the received pressure signal, the occupant dimension information including at least one of occupant height and weight information;

the controller generating seating control signals as a function of the seat occupant dimension information and outputting the seating control signals to the fluid pressure control system to automatically control seating comfort.

2. The system of claim 1, wherein the seat is secured within an automotive vehicle having a plurality of vehicle control systems, the automatic seating comfort control system further comprising:

a communication link for communicating the seat occupant dimension information to at least one of the plurality of vehicle control systems.

3. The system of claim 1, wherein the at least one pressure transducer comprises a plurality of pressure transducers for transducing a plurality of pressures representative of the pressures within the plurality of bladders into a corresponding plurality of pressure signals,

and wherein the controller receives the plurality of pressure signals and estimates occupant dimension information as a function of the received plurality of pressure signals.

4. The system of claim 3, wherein the seating control signals generated and output by the controller include desired bladder pressure control signals for the plurality of bladders for controlling seating firmness.

5. The system of claim 3, further comprising:

at least one seat position transducer for transducing seat orientation into at least one corresponding position signal;

and wherein the controller further receives the position signal and estimates seat occupant dimension information as a function of the received pressure signal and the received position signal.

6. The system of claim 3, wherein the seating control signals generated and output by the controller include at least one desired seat position control signal for controlling seating position.

7. The system of claim 6, wherein the seat includes a seatback and a headrest adjacent the seatback, the system further comprising:

an actuator secured within a first one of the group consisting of the seatback and the headrest, the actuator having an output shaft coupled to a second one of the group consisting of the seatback and the headrest, the actuator controlled in response to a headrest position control signal applied thereto to extend and retract the output shaft relative to the actuator to vary the position of the headrest relative to the seatback;

and wherein the at least one desired seat position control signal includes the headrest position control signal.

8. The system of claim 1, further comprising:

an operator interface for transducing a request for manual seating control from an operator into a manual control request signal and for transducing manual control commands from an operator into manual seat control command signals;

wherein the fluid pressure control system receives the manual seat control command signals and controls passage of a fluid into and out of selected ones of the plurality of bladders in response to the received manual seat control command signals;

and wherein the controller receives the manual control request signal and suspends automatic seating control operations upon receipt thereof.

9. A method for controlling firmness of an automotive vehicle seat having a plurality of fluid-filled bladders disposed therein and having a fluid pressure control system for varying the fluid pressure in individual ones of the plurality of fluid-filled bladders in response to pressure control commands, comprising the steps of:

transducing pressure within the fluid pressure control system into corresponding pressure signals;

periodically sampling the pressure signals;

sensing presence of an occupant within the seat;

upon sensing the presence, estimating attributes of the occupant as a function of the sampled pressure signals, the attributes including at least one of height and weight of the occupant;

generating desired pressure values for at least one of the plurality of fluid-filled bladders as a function of both the sampled pressure signals and the estimated attributes of the occupant;

determining pressure control commands as a function of the desired pressure values; and

controlling pressure within at least one of the plurality of fluid-filled bladders in accordance with the determined pressure control commands.

10. The method of claim 9, the seat having a headrest adjacent thereto and an actuator for varying the position of the headrest relative to the seat in response to a headrest position control command, the method further for controlling automotive seat headrest position and further comprising the steps of:

calculating a desired headrest position as a function of the occupant attributes;

generating a headrest position command as a function of the desired headrest position; and

controlling headrest position in accordance with the generated headrest position command.

11. The method of claim 9, wherein the automotive vehicle includes an additional vehicle control system, the method further comprising the step of:

communicating the estimated attributes of the seat occupant to the additional vehicle control system.