Ventilation Device for an Interior of a Motor Vehicle and Method for Operating a Ventilation Device of This Kind

Patent metadata

Field	Value
Publication number	US-2019337357-A1
Application number	US-201916515655-A
Country	US
Kind code	A1
Filing date	Jul 18, 2019
Priority date	Jan 19, 2017
Publication date	Nov 7, 2019
Grant date	—

Abstract

A ventilation device for an interior of a motor vehicle includes a ducting system with at least one air duct and a blower via which an air flow can be generated in the ducting system. To allow active ventilation of the interior at particularly low noise levels, at least one sound transducer of the ventilation device is provided via which a sound pressure in the ducting system can be detected and a signal corresponding to the sound pressure detected can be transmitted to at least one second sound transducer of the ventilation device. In order to reduce the sound pressure, a counter sound pressure depending on the signal in the ducting system can be generated by the at least one second sound transducer.

First claim

What is claimed is:

1 . A ventilation device for an interior compartment of a motor vehicle, comprising:
a channel system which includes an air channel; a blower, wherein an air stream is generatable in the channel system by the blower; at least one first sound transducer; and at least one second sound transducer; wherein a sound pressure in the channel system is detectable by the at least one first sound transducer and wherein a signal corresponding to a detected sound pressure is transmittable to the at least one second sound transducer by the at least one first sound transducer; wherein an antisound pressure for reducing the detected sound pressure is generatable by the at least one second sound transducer dependent on the signal.

2 . The ventilation device according to claim 1 , wherein the air channel is divided by a separating element into a first partial channel and a second partial channel.

3 . The ventilation device according to claim 2 , wherein the first partial channel and the second partial channel are delimited with respect to one another in an air-impermeable manner at least in regions.

4 . The ventilation device according to claim 3 , wherein the first partial channel and the second partial channel are delimited with respect to one another parallel to a flow direction of the air stream.

5 . The ventilation device according to claim 2 , wherein the first partial channel and the second partial channel each have a first sound transducer and a second sound transducer.

6 . The ventilation device according to claim 1 further comprising a flow guard element, wherein the at least one second sound transducer is delimited with respect to an interior region of the air channel by the flow guard element, wherein the flow guard element is acoustically permeable and is at least substantially impermeable to the air stream.

7 . The ventilation device according to claim 1 , wherein the at least one second sound transducer is mounted such that the at least one second sound transducer is acoustically decoupled from the air channel.

8 . The ventilation device according to claim 1 , wherein the detected sound pressure is reduceable in a frequency range from 600 Hz to 2500 Hz by the at least one second sound transducer.

9 . A method for operating the ventilation device according to claim 1 , comprising the acts of:
detecting the sound pressure in the channel system by the at least one first sound transducer; generating the signal corresponding to the detected sound pressure by the at least one first sound transducer; transmitting the signal by the at least one first sound transducer to the at least one second sound transducer; and generating the antisound pressure by the at least one second sound transducer dependent on the signal and reducing the detected sound pressure in the channel system by the antisound pressure.

10 . The method according to claim 9 further comprising the acts of:
determining a sound spectrum corresponding to the detected sound pressure; and
in the act of generating, controlling the at least one second sound transducer dependent on the determined sound spectrum.

11 . The method according to claim 9 further comprising the act of:
in the act of generating, controlling the at least one second sound transducer dependent on a temperature of the air stream.

12 . The method according to claim 10 further comprising the act of:
in the act of generating, controlling the at least one second sound transducer dependent on a temperature of the air stream.

Assignees

• Bayerische Motoren Werke Ag

Inventors

• Biermann Jan

Classifications

• B60H2001/006

  Noise reduction · CPC title

• G10K11/178 Primary

  by electro-acoustically regenerating the original acoustic waves in anti-phase · CPC title

• F24F13/24

  Means for preventing or suppressing noise · CPC title

• B60H1/00507 Primary

  Details, e.g. mounting arrangements, desaeration devices (B60H1/32 takes precedence) · CPC title

• F24F2013/247

  Active noise-suppression · CPC title