# US 11,305,609 B2 · Fresh air filter regeneration for an HVAC system in a work vehicle > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,305,609 B2 - Document ID: US11305609B2 - Status: Granted - Kind: B2 - Application number: 16/612,731 - Filed: 2018-05-10 - Published: 2020-05-28 - Granted: 2022-04-19 - Earliest claimed: 2017-05-11 - Assignees: CNH Industrial America LLC - Applicants: CNH Industrial America LLC - Inventors: Doriano Ferri; Joaquim Guitart Corominas - Web page: https://patentgrep.com/patent/US11305609B2 ## CPC - B60H 1/00378: {for tractor or load vehicle cabins} - B01D 46/44: controlling filtration - B01D 46/71: with pressurised gas, e.g. pulsed air - B60H 1/00735: {Control systems or circuits characterised by their input, i.e. by the detection, measurement or calculation of particular conditions, e.g. signal treatment, dynamic models} - B60H 1/00864: {Ventilators and damper doors} - B60H 1/26: Ventilating openings in vehicle exterior; Ducts for conveying ventilating air - B60H 3/0633: {with provisions for regenerating or cleaning the filter element} - B01D 2279/50: for air conditioning - B60H 2001/00099: {comprising additional ventilating means} - B60H 2001/00221: {Devices in the floor or side wall area of the passenger compartment} - B60H: ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES - B01D: SEPARATION (separating solids from solids by wet methods B03B, B03D; by pneumatic jigs or tables B03B; by other dry methods B07; magnetic or electrostatic separation of solid materials from solid materials or fluids, separation by high-voltage electric fields B03C; centrifuges, vortex apparatus B04; presses per se for squeezing-out liquid from liquid-containing material B30B9/02; treatment of water C02F, e.g. softening by ion-exchange C02F1/42; {arrangements of air intake cleaners in gas turbine plants F02C7/05} ; arrangements or mounting of filters in air-conditioning, air-humidification or ventilation F24F13/28) ## Abstract An HVAC system for use with an operator cab of a work vehicle is characterized by an air duct arrangement in communication with a first fan outlet and second fan outlet. At least one air flow diverter is positioned within the air duct arrangement for selectively diverting air flowing through the air duct arrangement. During a “fresh air filter regeneration” mode the at least one air flow diverter closes the air duct arrangement, the first fan is activated, and the second fan is deactivated, whereby discharge air from the first fan flows through the second fan in a reverse direction and flows through the fresh air filter. ## Claims ### Claim 1 A heating ventilating and air conditioning (HVAC) system for an operator cab of a work vehicle, the HVAC system including: a first fan having an inlet and an outlet, the first fan inlet being in communication with an interior of the operator cab; a second fan having an inlet and an outlet, the second fan inlet being in communication with an exterior ambient environment; a fresh air filter positioned in communication with the inlet of the second fan; an air duct arrangement in communication with the first fan outlet and the second fan outlet; and at least one air flow diverter positioned within the air duct arrangement for selectively, diverting air flowing through the air duct arrangement; and wherein in a “fresh air filter regeneration” mode the at least one air flow diverter closes the air duct arrangement, the first fan is activated, and the second fan is deactivated, whereby air discharged by the first fan is diverted to the second fan for flow through the second fan in a direction from the second fan outlet to the second fan inlet before flowing through the fresh air filter. ### Claim 2 (depends on 1) The HVAC system of claim 1, wherein the HVAC system includes an HVAC module having a recirculation box coupled with the second fan, the recirculation box controlling an amount of recirculation air and fresh air that are drawn into the second fan, the recirculation box having a controllable first door in communication with the interior of the operator cab, and a controllable second door in communication with the exterior ambient environment, the first door being closed and the second door being opened during said fresh air filter regeneration mode. ### Claim 3 (depends on 1) The HVAC system of claim 1, wherein: the air duct arrangement includes at least one distribution plenum, each said at least one distribution plenum having at least one outlet and an inlet in communication with the first fan outlet and the second fan outlet, each said at least one distribution plenum including at least one of said at least one air flow diverter; and an electrical processing circuit is configured in said fresh air filter regeneration mode to position the at least one air flow diverter to close each said outlet of each said at least one distribution plenum. ### Claim 4 (depends on 1) The HVAC system of claim 1, wherein: said fresh air filter regeneration mode requires that an output signal received from a door sensor of the operator cab indicates that an access door is open. ### Claim 5 (depends on 1) The HVAC system of claim 1, wherein an electrical processing circuit coupled with the first fan and the second fan initiates said fresh air filter regeneration mode dependent upon a time basis. ### Claim 6 (depends on 4) The HVAC system of claim 4, wherein an electrical processing circuit coupled with the first fan and the second fan initiates said fresh air filter regeneration mode when an output signal received from a second door sensor of the operator cab indicates that a second door is closed. ### Claim 7 (depends on 5) The HVAC system of claim 5, wherein the time basis corresponds to a predetermined number of operating hours for the work vehicle. ### Claim 8 (depends on 3) The HVAC system of claim 3, wherein the air duct arrangement includes a front delivery layout having at least one of said at least one air flow diverter, and a parallel delivery layout having at least one of said at least one air flow diverter, said electrical processing circuit controlling each said air flow diverter during said fresh air filter regeneration mode to close each of said front delivery layout and said parallel delivery layout. ### Claim 9 (depends on 8) The HVAC system of claim 8, wherein: the HVAC system includes an HVAC module containing each of the first fan and the second fan; and the front delivery layout includes a first distribution plenum of said at least one distribution plenum having a plurality of outlets and an inlet in communication with the first fan outlet and the second fan outlet, said first distribution plenum including at least one of said at least one air flow diverter for selectively opening and closing said plurality of outlets. ### Claim 10 (depends on 1) The HVAC system, of claim 1, wherein said fresh air filter regeneration mode is initiated dependent upon at least one sensed or calculated operating parameter associated with the fresh air filter. ### Claim 11 (depends on 10) The HVAC system of claim 10, wherein the at least one sensed or calculated operating parameter includes a pressure drop across the fresh air filter. ### Claim 12 (depends on 1) The HVAC system of claim 1, wherein the first fan is a recirculation blower and the second fan is a pressurization blower. ### Claim 13 A work vehicle including the HVAC system according to any one of the preceding claim.