System and method for variable sound dampening in an adjustable vehicle seat
A vehicle seat includes a first inflatable bladder and a pump fluidically coupled with the first bladder. A sound dampening assembly is fluidically coupled between the first bladder and the pump and includes an inner chamber defined by a first and second telescoping portions and a motor coupled between the first and second telescoping portions. A controller causes the motor to adjust the inner chamber in response to an operation of the pump.
1. A vehicle seat, comprising:
a first inflatable bladder;
a pump fluidically coupled with the first bladder;
a sound dampening assembly fluidically coupled between the first bladder and the pump and including an inner chamber defined by a first and second telescoping portions and a motor coupled between the first and second telescoping portions; and
a controller causing the motor to adjust the inner chamber in response to an operation of the pump.
2. The vehicle seat of claim 1 , wherein:
the sound dampening assembly is a muffler having first and second facing ends of the chamber defined respectively on the first and second telescoping portions; and
causing the motor to adjust the inner chamber includes adjusting a distance between the first and second facing ends.
3. The vehicle seat of claim 2 , wherein the muffler further includes at least one sound dampening material lining at least a portion of the inner chamber.
4. The vehicle seat of claim 1 , wherein:
the sound dampening assembly is a dual-pneumatic tube unit including a first tube of a fixed length and a second tube including the first and second telescoping portions; and
the first and second telescoping portions are fluidically coupled together at a first end and a second end of the second telescoping portion.
5. The vehicle seat of claim 4 , wherein causing the motor to adjust the inner chamber includes adjusting a length of the second tube.
6. The vehicle seat of claim 1 , wherein:
the operation of the pump is a speed of the pump; and
the controller causes the motor to adjust the inner chamber in response to the operation of the pump by driving the motor to change a length of the inner chamber to cancel at least one primary frequency of the operation of the pump that varies with the speed of the pump.
7. The vehicle seat of claim 6 , wherein the controller causes the motor to adjust the inner chamber based on a pre-programmed relationship between a pump speed signal and a corresponding desired length of the inner chamber.
8. The vehicle seat of claim 1 , further including a microphone positioned adjacent the pump and in communication with the controller, wherein:
the controller implements a feedback loop using the microphone to causes the motor to adjust the inner chamber in response to the operation of the pump to drive a sound level observed by the microphone toward a minimum level.
9. The vehicle seat of claim 1 , wherein:
the vehicle seat includes a cushion and a seatback coupled with the cushion; and
the pump and sound dampening assembly are mounted within the cushion.
10. A seat customization system, comprising:
a first inflatable bladder;
a pump fluidically coupled with the first bladder;
a sound dampening assembly fluidically coupled between the first bladder and the pump and including an inner chamber defined by a first and second telescoping portions and a motor coupled between the first and second telescoping portions; and
a controller causing the motor to adjust the inner chamber in response to an operation of the pump.
11. The system of claim 10 , wherein:
the sound dampening assembly is a muffler having first and second facing ends of the chamber defined respectively on the first and second telescoping portions; and
causing the motor to adjust the inner chamber includes adjusting a distance between the first and second facing ends.
12. The system of claim 10 , wherein:
the sound dampening assembly is a dual-pneumatic tube unit including a first tube of a fixed length and a second tube including the first and second telescoping portions;
the first and second telescoping portions are fluidically coupled together at a first end and a second end of the second telescoping portion; and
causing the motor to adjust the inner chamber includes adjusting a length of the second tube.
13. The system of claim 10 , wherein:
the operation of the pump is a speed of the pump; and
the controller causes the motor to adjust the inner chamber in response to the operation of the pump by driving the motor to change a length of the inner chamber to cancel at least one primary frequency of the operation of the pump that varies with the speed of the pump.
14. The system of claim 13 , wherein the controller causes the motor to adjust the inner chamber based on a pre-programmed relationship between a pump speed signal and a corresponding desired length of the inner chamber.
15. The system of claim 10 , further including a microphone positioned adjacent the pump and in communication with the controller, wherein:
the controller implements a feedback loop using the microphone to causes the motor to adjust the inner chamber in response to the operation of the pump to drive a sound level observed by the microphone toward a minimum level.