# US 10,870,329 B2 · Ventilation device for an interior of a motor vehicle and method for operating a ventilation device of this kind > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 10,870,329 B2 - Document ID: US10870329B2 - Status: Granted - Kind: B2 - Application number: 16/515,655 - Filed: 2019-07-18 - Published: 2019-11-07 - Granted: 2020-12-22 - Earliest claimed: 2017-01-19 - Assignees: Bayerische Motoren Werke Aktiengesellschaft - Applicants: Bayerische Motoren Werke Aktiengesellschaft - Inventors: Jan Biermann - Web page: https://patentgrep.com/patent/US10870329B2 ## CPC - B60H 1/00507: {Details, e.g. mounting arrangements, desaeration devices (B60H1/32 takes precedence)} - F24F 13/24: Means for preventing or suppressing noise - G10K 11/178: by electro-acoustically regenerating the original acoustic waves in anti-phase - B60H 2001/006: {Noise reduction} - F24F 2013/247: {Active noise-suppression} - B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES - F24F: AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING (removing dirt or fumes from areas where they are produced B08B15/00; vertical ducts for carrying away waste gases from buildings E04F17/02; tops for chimneys or ventilating shafts, terminals for flues F23L17/02) - G10K: SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR ## 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. ## Claims ### Claim 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; 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; and a flow guard element, wherein the at least one second sound transducer is covered by the flow guard element with respect to the air stream, wherein the flow guard element is acoustically permeable and is at least substantially impermeable to the air stream such that only a portion of the air stream passes through the flow guard element. ### Claim 2 (depends on 1) 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. ### Claim 3 (depends on 2) 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. ### Claim 4 (depends on 3) 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. ### Claim 5 (depends on 2) 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. ### Claim 6 (depends on 1) 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. ### Claim 7 (depends on 1) 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. ### Claim 8 (depends on 1) 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. ### Claim 9 (depends on 8) The method according to claim 8 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. ### Claim 10 (depends on 8) The method according to claim 8 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. ### Claim 11 (depends on 9) 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.