# US 7,406,832 B2 · Apparatus and methods for disinfecting components of an air conditioning system in 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 7,406,832 B2 - Document ID: US7406832B2 - Status: Granted - Kind: B2 - Application number: 11/602,972 - Filed: 2006-11-22 - Published: 2007-03-22 - Granted: 2008-08-05 - Earliest claimed: 2004-05-25 - Assignees: Bayerische Motoren Werke Aktiengesellschaft - Inventors: Stefan Wiedemann; Dieter Schlenz - Web page: https://patentgrep.com/patent/US7406832B2 ## CPC - B60H 3/0078: {comprising electric purifying means} - B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES ## Abstract A device for disinfecting components of an air conditioning system in a motor vehicle is provided. The device includes an ozone generator arranged in close proximity to an evaporator in the air conditioning system. The device further includes an electronic control unit configured to activate the ozone generator to produce a comparatively large amount of ozone sufficient to disinfect the evaporator. The electronic control device activates the ozone generator when information provided to the control unit indicates that a condition is met, under which air flaps between the air conditioning system and a passenger compartment of the motor vehicle may remain closed or are expected to remain closed for a time sufficient for the disinfection. ## Claims ### Claim 1 A device for disinfecting components of an air conditioning system in a motor vehicle, the device comprising: an ozone generator arranged in close proximity to an evaporator in the air conditioning system; and an electronic control unit configured to activate the ozone generator to produce a comparatively large amount of ozone sufficient to disinfect the evaporator, when information provided to the control unit indicates that a condition is met, under which air flaps between the air conditioning system and a passenger compartment of the motor vehicle may remain closed for a time sufficient for the disinfection, wherein the condition under which the air flaps may remain closed is met when the passenger compartment is in a probable unoccupied state, and wherein the control unit is configured to detect the probable unoccupied state of the passenger compartment. ### Claim 2 (depends on 1) The device of claim 1, wherein the control unit determines that the passenger compartment is in the probable unoccupied state, when at least one of an internal combustion engine and a radio terminal is deactivated. ### Claim 3 (depends on 1) The device of claim 1, wherein the control unit determines that the passenger compartment is in the probable unoccupied state, when a central locking system is activated. ### Claim 4 (depends on 1) The device of claim 1, wherein the control unit determines that the passenger compartment is in the probable unoccupied state, when a seat occupant detection system does not detect passengers. ### Claim 5 (depends on 1) The device of claim 1, wherein the condition, under which the air flaps may remain closed, is met by at least one of a switched-off state of an auxiliary ventilating function, an auxiliary heating function, an auxiliary air conditioning function, and a residual heat function when the internal combustion engine is switched off. ### Claim 6 (depends on 1) The device of claim 1, wherein the condition, under which the air flaps may remain closed, is that auxiliary electric devices may be activated. ### Claim 7 (depends on 1) The device of claim 1, wherein the condition, under which the air flaps may remain closed, is a predetermined clock time. ### Claim 8 (depends on 1) The device of claim 1, wherein, when the air flaps are closed, the control unit induces the production of the ozone for a predetermined first time span. ### Claim 9 (depends on 8) The device of claim 8, wherein the control unit determines, after passage of the predetermined first time span, a second time span sufficient for reducing the ozone, and wherein the control unit causes the air flaps to remain closed for at least the second time span. ### Claim 10 (depends on 9) The device of claim 9, wherein, when the air flaps are closed, the control unit activates a blower of the air conditioning system for a predetermined third time span, when within the passage of the first time span or within the passage of the second time span the condition is no longer met. ### Claim 11 (depends on 1) The device of claim 1, wherein the control unit is configured to control the ozone generator to produce a second amount of ozone less than the first amount, when information provided to the control unit indicates a second condition is met, under which the air flaps between the air conditioning system and the passenger compartment are expected to be open. ### Claim 12 A method for disinfecting components of an air conditioning system in a motor vehicle, the method comprising the acts of: determining a condition under which air flaps between the air conditioning system and a passenger compartment of the motor vehicle may remain closed for an amount of time sufficient to disinfect the air conditioning system; and when the condition is met, inducing a first amount of ozone in the air conditioning system, the first amount of ozone sufficient to disinfect an evaporator of the air conditioning system, wherein determining the condition under which the air flans may remain closed comprises determining that the passenger compartment is in a probable unoccupied state. ### Claim 13 (depends on 12) The method of claim 12, wherein determining that the passenger compartment is in a probable unoccupied state comprises: determining that at least one of an internal combustion engine and a radio terminal is deactivated. ### Claim 14 (depends on 12) The method of claim 12, wherein determining that the passenger compartment is in a probable unoccupied state comprises: determining that a central locking system is activated. ### Claim 15 (depends on 12) The method of claim 12, wherein determining that the passenger compartment is in a probable unoccupied state comprises: determining that a seat occupant detection system does not detect passengers. ### Claim 16 (depends on 12) The method of claim 12, wherein determining a condition under which the air flaps may remain closed comprises: determining at least one of a switched-off state of an auxiliary ventilating function, an auxiliary heating function, an auxiliary air conditioning function, and a residual heat function when the internal combustion engine is switched off. ### Claim 17 (depends on 12) The method of claim 12, wherein determining a condition under which the air flaps may remain closed comprises: determining that auxiliary electric devices may be activated. ### Claim 18 (depends on 12) The method of claim 12, wherein determining a condition under which the air flaps may remain closed comprises: determining that a current clock time is in a predetermined time range. ### Claim 19 (depends on 12) The method of claim 12, further comprising: when the air flaps are closed, inducing the first amount of ozone in the air conditioning system for a first time span. ### Claim 20 (depends on 19) The method of claim 19, further comprising: determining, after passage of the first time span, a second time span sufficient for reducing the ozone; and controlling the air flaps to remain closed for at least the second time span. ### Claim 21 (depends on 20) The method of claim 20, further comprising: detecting that the condition is no longer met during at least one of the first time span and the second time span; and activating a blower of the air conditioning system for a predetermined third time span. ### Claim 22 (depends on 12) The method of claim 12, further comprising: reducing the first amount of ozone to a second amount of ozone less than the first amount, when another condition is present under which the air flaps between the air conditioning system and the passenger compartment are expected to be open.