IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0710044
(2010-02-22)
|
등록번호 |
US-8312918
(2012-11-20)
|
발명자
/ 주소 |
- Burns, Trevor
- Kanemaru, Junichi
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
0 인용 특허 :
3 |
초록
▼
A system and method for detecting low levels of humidity (i.e. less than 10%) inside an automotive vehicle is provided whereby the total absolute humidity inside the vehicle is determined by multiplying the number of occupants in the vehicle by an absolute humidity factor to obtain a total absolute
A system and method for detecting low levels of humidity (i.e. less than 10%) inside an automotive vehicle is provided whereby the total absolute humidity inside the vehicle is determined by multiplying the number of occupants in the vehicle by an absolute humidity factor to obtain a total absolute humidity expelled by the vehicle occupants. The absolute humidity outside the vehicle is added to the total absolute humidity expelled by the vehicle occupants to arrive at a total vehicle cabin absolute humidity.
대표청구항
▼
1. A control method in an HVAC system of a vehicle for preemptively eliminating a fog condition, comprising: calculating a fog margin based on a window temperature of a window and a dew point inside the vehicle, wherein the dew point is based on ambient temperature and one of relative humidity and a
1. A control method in an HVAC system of a vehicle for preemptively eliminating a fog condition, comprising: calculating a fog margin based on a window temperature of a window and a dew point inside the vehicle, wherein the dew point is based on ambient temperature and one of relative humidity and absolute humidity inside the vehicle, and the dew point is calculated by: determining the relative humidity, anddetermining whether the relative humidity is less than a predetermined percentage, wherein if the relative humidity is greater than or equal to the predetermined percentage then the relative humidity and ambient temperature are used to calculate the dew point, wherein if the relative humidity is less than the predetermined percentage then the absolute humidity and ambient temperature are used to calculate the dew point; andcomparing the fog margin to a dew point margin to determine the fogging condition. 2. The control method of claim 1 wherein at least one of A/C power, fan speed and vent mode is controlled based on the fogging condition. 3. The control method of claim 1 wherein the fogging condition is “fog not possible” when the fog margin is greater than a first predetermined threshold that is above the dew point margin, is “fog control zone” when the fog margin is greater than the dew point margin but not greater than the first predetermined threshold, is “fog danger zone” when the fog margin is less than the dew point margin but not below a second predetermined threshold that is below the dew point margin, and is “severe fog zone” when the fog margin is less than the second predetermined threshold. 4. The control method of claim 3 wherein the A/C power is turned on when the fogging condition is “fog control zone,” “fog danger zone,” or “severe fog zone” irrespective of a desired temperature set point for the vehicle. 5. The control method of claim 4 wherein the A/C power is modulated when the fogging condition is “fog control zone,” and is turned on to maximum power when the fogging condition is “fog danger zone” or “severe fog zone.” 6. The control method of claim 3 wherein the vent mode is modified when an ambient temperature of the vehicle is above a predetermined threshold temperature and the fogging condition is “fog danger zone” or “severe fog zone,” irrespective of a desired temperature set point for the vehicle. 7. The control method of claim 6 wherein the vent mode is modified to open the heater and defrost ducts when the fogging condition is “fog danger zone” and is modified to open the defrost duct only when the fogging condition is “severe fog zone.” 8. The control method of claim 3 wherein a fan speed is set based on a desired temperature set point, the fan speed increased a first amount when the fogging condition is “fog danger zone” and ambient temperature is greater than or equal to a predetermined temperature, increased a second, higher amount when the fogging condition is “fog danger zone” and ambient temperature is less than the predetermined temperature, increased a third, still higher amount when the fogging condition is “fog severe zone” and ambient temperature is greater than or equal to the predetermined temperature, and increased a fourth, even higher amount when the fogging condition is “fog severe zone” and ambient temperature is less than the predetermined amount. 9. The control method of claim 1 wherein calculating the fog margin includes: determining a window temperature for a window of the vehicle; anddetermining a dew point for the vehicle. 10. The control method of claim 1 wherein the dew point margin is calculated by: determining a fog predictability factor;determining a sensor accuracy factor for a humidity sensor inside the vehicle; anddetermining the dew point margin based on the fog predictability factor and the sensor accuracy factor. 11. The control method of claim 1, wherein if the relative humidity is less than the predetermined percentage, the absolute humidity is calculated by: determining the number of occupants in the vehicle;determining an average amount of humidity a person expels (AH(factor)); anddetermining absolute humidity of air outside the vehicle (AH(ambient)). 12. The control method of claim 11, wherein the absolute humidity is calculated by multiplying the number of occupants by AH(factor) to obtain a total occupant expelled absolute humidity and then adding AH(ambient) to the total occupant expelled absolute humidity. 13. An HVAC method for controlling fogging on a window in a vehicle, comprising: determining a fog margin based on a window temperature of the window and a dew point inside the vehicle, wherein the dew point is based on ambient temperature and one of relative humidity and absolute humidity inside the vehicle, and the dew point is calculated by: determining the relative humidity, anddetermining whether the relative humidity is less than a predetermined percentage, wherein if the relative humidity is less than the predetermined percentage then calculating absolute humidity, wherein the absolute humidity is calculated by:determining the number of occupants in the vehicle;determining an average amount of humidity a person expels (AH(factor));determining absolute humidity of air outside the vehicle (AH(ambient)); andmultiplying the number of occupants by AH(factor) to obtain a total occupant expelled absolute humidity and then adding AH(ambient) to the total occupant expelled absolute humidity; andcontrolling A/C power, fan speed and vent mode in an HVAC system based on the fog margin. 14. The HVAC method of claim 13 wherein the A/C power is turned off, and the fan speed and the vent mode are controlled based only on a desired cabin temperature set point when the fog margin is above a first predetermined threshold representing a fog not possible zone for the window. 15. The HVAC method of claim 14 wherein the A/C power is turned on and modulated between a maximum power and a minimum power, and fan speed and vent mode are controlled based only on the desired cabin temperature set point when the fog margin is less than the first predetermined threshold but above a second predetermined threshold representing a fog control zone for the window. 16. The HVAC method of claim 15 wherein the A/C power is turned on and held at a maximum power, and the fan speed and the vent mode are controlled based on the desired cabin temperature set point and an ambient temperature when the fog margin is less than the second predetermined threshold but above a third predetermined threshold representing a fog danger zone for the window. 17. The HVAC method of claim 16 wherein the A/C power is turned on and held at a maximum power, and the fan speed and the vent mode are controlled based on the desired cabin temperature set point, the ambient temperature and relative humidity when the fog margin is less than the third predetermined threshold representing a severe fog zone for the window. 18. The HVAC method of claim 13 wherein controlling the A/C power, the fan speed and the vent mode based on the fog margin includes: comparing the fog margin to predetermined thresholds; andcontrolling the A/C power, the fan speed and the vent mode based on the fog margin as compared to the predetermined thresholds. 19. The HVAC method of claim 18 wherein the predetermined thresholds are based on a dew point margin for the vehicle. 20. The HVAC method of claim 19 wherein the dew point margin is calculated by: determining a fog predictability factor;determining a sensor accuracy factor for a humidity sensor inside the vehicle; anddetermining the dew point margin based on the fog predictability factor and the sensor accuracy factor.
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