IPC분류정보
국가/구분 |
United States(US) Patent
등록
|
국제특허분류(IPC7판) |
|
출원번호 |
US-0702399
(2003-11-05)
|
우선권정보 |
JP-0325453 (2002-11-08) |
발명자
/ 주소 |
- Ogiso, Akio
- Yoshida, Satohisa
- Umebayashi, Makoto
|
출원인 / 주소 |
|
대리인 / 주소 |
|
인용정보 |
피인용 횟수 :
2 인용 특허 :
9 |
초록
▼
A vehicle air-conditioning system of a dual air conditioner type includes a front seat air-conditioning unit for air-conditioning a front seat side and a rear seat air-conditioning unit for air-conditioning a rear seat side. The system includes parallel connected evaporators for the front seat air-c
A vehicle air-conditioning system of a dual air conditioner type includes a front seat air-conditioning unit for air-conditioning a front seat side and a rear seat air-conditioning unit for air-conditioning a rear seat side. The system includes parallel connected evaporators for the front seat air-conditioning unit and the rear seat air-conditioning unit. At a low flow rate of refrigerant, the system prevents a significant increase in the temperature of air blown into the rear seat area relative to the temperature in the front seat area. The system employs a variable capacity compressor that enables its discharge capacity to be controlled by an external control signal, allowing the discharge capacity of the compressor to be controlled in accordance with the higher evaporator temperature of the temperatures at the front seat evaporator and the rear seat evaporator and a target evaporator temperature.
대표청구항
▼
1. A vehicle air-conditioning system comprising:a front seat air-conditioning unit for air-conditioning a front seat side in a passenger compartment, said front seat air-conditioning unit comprising a front seat evaporator, front seat evaporator temperature sensor means for sensing a temperature at
1. A vehicle air-conditioning system comprising:a front seat air-conditioning unit for air-conditioning a front seat side in a passenger compartment, said front seat air-conditioning unit comprising a front seat evaporator, front seat evaporator temperature sensor means for sensing a temperature at said front seat evaporator, and a front seat air blower for blowing air into said front seat evaporator; a rear seat air-conditioning unit for air-conditioning a rear seat side in the passenger compartment, said rear seat air-conditioning unit comprising a rear seat evaporator, rear seat evaporator temperature sensor means for sensing a temperature at said rear seat evaporator, and a rear seat air blower for blowing air into said rear seat evaporator, wherein said front seat evaporator and said rear seat evaporator are connected in parallel to each other in a refrigeration cycle, allowing one compressor to circulate a refrigerant through said front seat evaporator and said rear seat evaporator, said compressor allowing its discharge flow rate of the refrigerant to be controlled by an external control signal; and control means for receiving sensor signals from said front seat evaporator temperature sensor means and said rear seat evaporator temperature sensor means to control a discharge flow rate of the refrigerant from said compressor, wherein a discharge flow rate of the refrigerant from said compressor is controlled in accordance with a higher evaporator temperature of temperatures at said front seat evaporator and said rear seat evaporator and a target evaporator temperature. 2. The vehicle air-conditioning system according to claim 1, wherein said compressor is controlled to provide the refrigerant at a discharge flow rate of about zero when a lower evaporator temperature of temperatures at said front seat evaporator and said rear seat evaporator is dropped to a predetermined frost determination temperature.3. The vehicle air-conditioning system according to claim 1, wherein said compressor is a variable capacity compressor that can vary its discharge capacity such that a discharge capacity of the variable capacity compressor is varied to thereby change the discharge flow rate of refrigerant.4. The vehicle air-conditioning system according to claim 1, wherein said compressor is a motor driven compressor driven by a motor such that an RPM of the motor is controlled to thereby vary the discharge flow rate of refrigerant.5. The vehicle air-conditioning system according to claim 1, wherein said target evaporator temperature is determined at least in accordance with a target blowing temperature of air blown into a passenger compartment from the front seat air-conditioning unit and a temperature of outside air.6. The vehicle air-conditioning system according to claim 1, wherein while said compressor circulates the refrigerant through both said front seat evaporator and said rear seat evaporator, said control means controls the discharge flow rate of the refrigerant from said compressor in accordance with the higher evaporator temperature of the temperatures at said front seat evaporator and said rear seat evaporator and the target evaporator temperature.7. The vehicle air-conditioning system according to claim 6, wherein said target evaporator temperature is a temperature that is common to front and rear seats.8. A vehicle air-conditioning system comprising:a front seat air-conditioning unit for air-conditioning a front seat side in a passenger compartment, wherein said front seat air-conditioning unit comprises a front seat evaporator, front seat evaporator temperature sensor means for sensing a temperature at said front seat evaporator, and a front seat air blower for blowing air into said front seat evaporator; a rear seat air-conditioning unit for air-conditioning a rear seat side in the passenger compartment, wherein said rear seat air-conditioning unit comprises a rear seat evaporator, rear seat evaporator temperature sensor means for sensing a temperature at said rear seat evaporator, and a rear seat air blower for blowing air into said rear seat evaporator, wherein said front seat evaporator and said rear seat evaporator are connected in parallel to each other in a refrigeration cycle, allowing one compressor to circulate a refrigerant through said front seat evaporator and said rear seat evaporator, said compressor allowing its discharge flow rate of the refrigerant to be controlled by an external control signal; and control means for receiving a sensor signal from said front seat evaporator temperature sensor means and said rear seat evaporator temperature sensor means to control a discharge flow rate of the refrigerant from said compressor, wherein: within a range of a high cooling heat load operation, a discharge flow rate of the refrigerant from said compressor is controlled only in accordance with a temperature at said front seat evaporator; and within a range of a low cooling heat load operation, a discharge flow rate of the refrigerant from said compressor is controlled in accordance with a higher evaporator temperature of temperatures at said front seat evaporator and said rear seat evaporator and a target evaporator temperature. 9. The vehicle air-conditioning system according to claim 8, wherein said compressor is controlled to provide the refrigerant at a discharge flow rate of about zero when a lower evaporator temperature of temperatures at said front seat evaporator and said rear seat evaporator is dropped to a predetermined frost determination temperature.10. The vehicle air-conditioning system according to claim 8, wherein said compressor is a variable capacity compressor which can vary its discharge capacity such that a discharge capacity of the variable capacity compressor is varied to thereby change the discharge flow rate of refrigerant.11. The vehicle air-conditioning system according to claim 8, wherein said compressor is a motor driven compressor which is driven by a motor such that an RPM of the motor is controlled to thereby vary the discharge flow rate of refrigerant.12. The vehicle air-conditioning system according to claim 8, wherein said target evaporator temperature is determined at least in accordance with a target blowing temperature of air blown into a passenger compartment from the front seat air-conditioning unit and a temperature of outside air.13. The vehicle air-conditioning system according to claim 8, wherein while said compressor circulates the refrigerant through both said front seat evaporator and said rear seat evaporator, said control means controls the discharge flow rate of the refrigerant from said compressor in accordance with the higher evaporator temperature of the temperatures at said front seat evaporator and said rear seat evaporator and the target evaporator temperature.14. The vehicle air-conditioning system according to claim 13, wherein said target evaporator is a temperature that is common to front and rear seats.15. A control unit for a vehicle air-conditioning system including a front seat air-conditioning unit for air-conditioning a front seat side in a passenger compartment, a rear seat air-conditioning unit for air-conditioning a rear seat side in the passenger compartment, and one compressor for circulating a refrigerant, said control unit comprising:an input device for receiving control signals from a plurality of sensors, the front seat air-conditioning unit and the rear seat air-conditioning unit, wherein the control signals include signals indicative of a front seat evaporator blower temperature, a rear seat evaporator blower temperature and an outside air temperature; and a control program for determining a discharge flow rate for the refrigerant from the compressor of the vehicle air-conditioning system and for generating an external control signal representative of a discharge flow rate for the refrigerant, wherein said control program determines the discharge flow rate of the refrigerant from the compressor in accordance with a higher evaporator temperature of the front seat blower evaporator temperatures and the rear seat evaporator temperature and a target evaporator temperature. 16. The control unit of claim 15, wherein said control program further determines the discharge flow rate only in accordance with the front seat blower evaporator temperature within a range of a high cooling heat load operation.17. The control unit of claim 15, wherein said control program determines the target evaporator temperature at least in accordance with a target blowing temperature of air blown into a passenger compartment from the front seat air-conditioning unit and the outside air temperature.
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