# US 2018/0320644 A1 · Air Filter Device for a Motor Vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 2018/0320644 A1 - Document ID: US20180320644A1 - Status: Published application - Kind: A1 - Application number: 16/032,524 - Filed: 2018-07-11 - Published: 2018-11-08 - Earliest claimed: 2016-01-15 - Assignees: Bayerische Motoren Werke Aktiengesellschaft - Applicants: Bayerische Motoren Werke Aktiengesellschaft - Inventors: Johannes BARTL; Volker RAAB; Christian DEBEVEC; Werner BAUMGARTNER - Web page: https://patentgrep.com/patent/US20180320644A1 ## CPC - F02M 35/088: {Water, snow or ice proofing; Separation or drainage of water, snow or ice} - F02B 29/0431: {Details or means to guide the ambient air to the heat exchanger, e.g. having a fan, flaps, a bypass or a special location in the engine compartment} - F02B 29/0475: {the intake air cooler being combined with another device, e.g. heater, valve, compressor, filter or EGR cooler, or being assembled on a special engine location} - F02M 35/0204: {for connecting or joining to other devices, e.g. pipes} - F02M 35/0209: {comprising flexible, resilient, movable or rotatable elements, e.g. with vibrating or contracting movements; Springs; Valves; Flaps (F02M35/06, F02M35/08 take precedence)} - F02M 35/024: using filters, e.g. moistened (F02M35/026 takes precedence; cleaning of the filtering material F02M35/08) - F02M 35/082: {By-pass means} - F02M 35/10163: {having air intakes specially adapted to selectively deliver naturally aspirated fluid or supercharged fluid} - F02M 35/108: with primary and secondary intake passages - F02B 29/0418: {the intake air cooler having a bypass or multiple flow paths within the heat exchanger to vary the effective heat transfer surface} - F02M 35/14: Combined air cleaners and silencers - Y02T 10/12: Improving ICE efficiencies - F02M: SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF - F02B: INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL (gas-turbine plants F02C; hot-gas or combustion-product positive-displacement engine plants F02G) - Y02T: CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION ## Abstract An air filter device for a motor vehicle is provided with a filter housing having an air inlet and an air outlet, a filter insert which is received in the filter housing and divides the inside of the filter housing into an untreated air section and a pure air section, and a bypass line for supplying air into the untreated air section. The bypass line extends from a connection opening in the filter housing to a cooler, especially a charge air cooler of the motor vehicle. ## Claims ### Claim 1 An air-filter device for a motor vehicle, comprising: a filter housing, which has an air inlet and an air outlet; a filter insert, which is accommodated in the filter housing and subdivides an interior of the filter housing into an unfiltered-air portion and a clean-air portion; and a bypass line for feeding air into the unfiltered-air portion, wherein the bypass line extends from a connection opening in the filter housing to a cooler of the motor vehicle. ### Claim 2 (depends on 1) The air-filter device as claimed in claim 1, wherein the filter housing has a housing channel between the connection opening and the filter insert. ### Claim 3 (depends on 2) The air-filter device as claimed in claim 2, wherein the filter insert has a bypass portion, which is directly adjacent to the housing channel. ### Claim 4 (depends on 2) The air-filter device as claimed in claim 2, wherein the housing channel has a flap, which releases or blocks an air flow in the housing channel. ### Claim 5 (depends on 1) The air-filter device as claimed in claim 1, wherein the air-filter device is configured as an intake muffler. ### Claim 6 (depends on 1) The air-filter device as claimed in claim 1, wherein the cooler is a charge-air cooler. ### Claim 7 (depends on 1) An air-supply assembly for an internal combustion engine of a motor vehicle, comprising: an air-filter device as claimed in claim 1; and an air-cooled charge-air cooler for cooling combustion air which is to be fed to the internal combustion engine, the charge-air cooler having an air-inlet side and an air-outlet side for cooling air and it being possible for cooling air to flow through said cooler in an air-flow direction, wherein one end of the bypass line, said end being assigned to the charge-air cooler, is adjacent to the air-outlet side of the charge-air cooler. ### Claim 8 (depends on 7) The air-supply assembly as claimed in claim 7, wherein the charge-air cooler has a combustion-air inlet, which is in flow connection with a combustion-air outlet of the charge-air cooler via cooling ribs around which cooling air flows, and the end of the bypass line, said end being assigned to the charge-air cooler, is arranged closer to the combustion-air inlet than to the combustion-air outlet. ### Claim 9 (depends on 7) The air-supply assembly as claimed in claim 7, wherein the end of the bypass line, said end being assigned to the charge-air cooler, is arranged on a periphery of the air-outlet side which is adjacent to the combustion-air inlet. ### Claim 10 (depends on 7) The air-supply assembly as claimed in claim 7, further comprising: a fan provided adjacent to the air-outlet side of the charge-air cooler, said fan forcing the cooling air in the air-flow direction and having a fan wheel and a fan frame, wherein the end of the bypass line, said end being assigned to the charge-air cooler, is fastened on the fan frame and is in flow connection with the air-outlet side of the charge-air cooler via an opening in the fan frame. ### Claim 11 (depends on 10) The air-supply assembly as claimed in claim 10, wherein the fan frame has a flap, which releases or blocks the opening in the fan frame.