System and method for prevention of windshield fogging in a motor vehicle
First Claim
Patent Images
1. A method for controlling a heating, ventilation and air-conditioning (HVAC) system of a vehicle to prevent fogging of a windshield of the automotive vehicle, the method comprising:
- determining whether the vehicle has been recently turned "on"; and
preventing the HVAC system from directing air flow toward the windshield for a first predetermined time period after the controller determines that the vehicle has recently been turned "on".
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Accused Products
Abstract
A method and system for controlling a heating, ventilation and air-conditioning (HVAC) system of a vehicle to prevent fogging of a windshield of the automotive vehicle is provided. The method and system include determination of whether the vehicle has been recently turned "on" and preventing the HVAC system from directing air flow toward the windshield for a first predetermined time period after it has been determined that the vehicle has recently been turned "on".
16 Citations
19 Claims
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1. A method for controlling a heating, ventilation and air-conditioning (HVAC) system of a vehicle to prevent fogging of a windshield of the automotive vehicle, the method comprising:
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determining whether the vehicle has been recently turned "on"; and preventing the HVAC system from directing air flow toward the windshield for a first predetermined time period after the controller determines that the vehicle has recently been turned "on". - View Dependent Claims (2)
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3. A method for controlling a heating, ventilation and air-conditioning (HVAC) system of a vehicle to prevent fogging of a windshield of the automotive vehicle, the method comprising:
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determining whether the vehicle has been recently turned "on"; preventing the HVAC system from directing air flow toward the windshield for a first predetermined time period after a controller determines that the vehicle has recently been turned "on"; receiving a plurality of input signals; determining whether the HVAC system is dry, comprising the controller determining that a compressor of the HVAC system was not operating prior to the vehicle being turned "off" and determining that a blower was operating for a third predetermined time period while the compressor was not operating prior to the vehicle being turned "off"; and if the HVAC system is dry, permitting the HVAC system to direct air flow to the windshield. - View Dependent Claims (4, 5)
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6. A method for controlling a heating, ventilation and air-conditioning (HVAC) system of a vehicle to prevent fogging of a windshield of the automotive vehicle, the method comprising:
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determining whether the vehicle has been recently turned "on"; preventing the HVAC system from directing air flow toward the windshield for a first predetermined time period after the controller determines that the vehicle has recently been turned "on"; receiving a plurality of input signals comprising an ambient temperature and a coolant temperature; determining whether the HVAC system is dry comprising a controller determining whether the ambient temperature is below a first predetermined temperature and whether the vehicle coolant temperature is below a second predetermined temperature; and if the HVAC system is dry, permitting the HVAC system to direct air flow to the windshield. - View Dependent Claims (7)
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8. A method for controlling a heating, ventilation and air-conditioning (HVAC) system of a vehicle to prevent fogging of a windshield of the automotive vehicle, the method comprising:
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determining whether the vehicle has been recently turned "on"; preventing the HVAC system from directing air flow toward the windshield for a first predetermined time period after the controller determines that the vehicle has recently been turned "on"; receiving a plurality of input signals comprising an ambient temperature and a coolant temperature; determining whether the HVAC system is dry wherein the step of determining whether the HVAC system is dry comprises the controller determining whether the vehicle was turned "off" for a second predetermined time period before the vehicle was most recently turned "on"; and if the HVAC system is dry, permitting the HVAC system to direct air flow to the windshield. - View Dependent Claims (9)
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10. A method for controlling a heating, ventilation and air-conditioning (HVAC) system of a vehicle to prevent fogging of a windshield of the automotive vehicle, the method comprising:
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determining whether the vehicle has been recently turned "on"; preventing the HVAC system from directing air flow toward the windshield for a first predetermined time period after the controller determines that the vehicle has recently been turned "on"; receiving a plurality of input signals comprising an ambient temperature and a coolant temperature; determining whether the HVAC system is dry comprising variably adjusting the first time period for which air is prevented from flowing toward the windshield based on the plurality of input signals; and if the HVAC system is dry, permitting the HVAC system to direct air flow to the windshield.
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- 11. A system for controlling a heating, ventilation and air-conditioning (HVAC) system of a vehicle to prevent fogging of a windshield of the automotive vehicle, the system comprising a controller operative to determine whether the vehicle has been recently turned "on" and for preventing the HVAC system from directing air flow toward the windshield for a first predetermined time period after the controller determines that the vehicle has recently been turned "on".
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14. A system for controlling a heating, ventilation and air-conditioning (HVAC) system of a vehicle to prevent fogging of a windshield of the automotive vehicle, the system comprising:
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a controller operative to determine whether the vehicle has been recently turned "on" and for preventing the HVAC system from directing air flow toward the windshield for a first predetermined time period after the controller determines that the vehicle has recently been turned "on"; a plurality of sensors for sensing a plurality of input signals; and the controller being operative to determine whether the HVAC system is dry from the plurality of input signals, and if the HVAC system is dry, permitting the HVAC system to direct air flow to the windshield, wherein the controller determines whether the HVAC system is dry by determining that a compressor of the HVAC system was not operating prior to the vehicle being turned "off" and determining whether a blower was operating for a third predetermined time period while the compressor was not operating prior to the vehicle being turned "off". - View Dependent Claims (15)
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16. A system for controlling a heating, ventilation and air-conditioning (HVAC) system of a vehicle to prevent fogging of a windshield of the automotive vehicle, the system comprising:
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a controller operative to determine whether the vehicle has been recently turned "on" and for preventing the HVAC system from directing air flow toward the windshield for a first predetermined time period after the controller determines that the vehicle has recently been turned "on"; a plurality of sensors for sensing a plurality of input signals, wherein the input signals comprise an ambient temperature signal and a coolant temperature signal; and the controller being operative to determine whether the HVAC system is dry by determining whether the ambient temperature signal is below a first predetermined value and the coolant temperature signal is below a second predetermined value, and if the HVAC system is dry, permitting the HVAC system to direct air flow to the windshield. - View Dependent Claims (17)
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18. A system for controlling a heating, ventilation and air-conditioning (HVAC) system of a vehicle to prevent fogging of a windshield of the automotive vehicle, the system comprising:
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a controller operative to determine whether the vehicle has been recently turned "on" and for preventing the HVAC system from directing air flow toward the windshield for a first predetermined time period after the controller determines that the vehicle has recently been turned "on"; a plurality of sensors for sensing a plurality of input signals including an ambient temperature; and the controller being operative to determine whether the HVAC system is dry from the plurality of input signals, and if the HVAC system is dry, permitting the HVAC system to direct air flow to the windshield, wherein the controller determines whether the HVAC system is dry by determining that a compressor of the HVAC system was not operating prior to the vehicle being turned "off" and determining whether a blower was operating for a third predetermined time period while the compressor was not operating prior to the vehicle being turned "off" and determining that the ambient temperature is below a predetermined temperature.
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19. A system for controlling a heating, ventilation and air-conditioning (HVAC) system of a vehicle to prevent fogging of a windshield of the automotive vehicle, the system comprising:
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a controller operative to determine whether the vehicle has been recently turned "on" and for preventing the HVAC system from directing air flow toward the windshield for a first predetermined time period after the controller determines that the vehicle has recently been turned "on"; a plurality of sensors for sensing a plurality of input signals; and the controller being operative to determine whether the HVAC system is dry from the plurality of input signals, and if the HVAC system is dry, permitting the HVAC system to direct air flow to the windshield, wherein the controller determines whether the HVAC system is dry by determining whether the vehicle was turned "off" for a second predetermined time period.
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Specification