[go: up one dir, main page]
More Web Proxy on the site http://driver.im/

US20120125026A1 - Air Conditioning System for Vehicle - Google Patents

Air Conditioning System for Vehicle Download PDF

Info

Publication number
US20120125026A1
US20120125026A1 US13/388,040 US201013388040A US2012125026A1 US 20120125026 A1 US20120125026 A1 US 20120125026A1 US 201013388040 A US201013388040 A US 201013388040A US 2012125026 A1 US2012125026 A1 US 2012125026A1
Authority
US
United States
Prior art keywords
refrigerant
refrigerant flow
pressure difference
pressure
flow rate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Abandoned
Application number
US13/388,040
Other languages
English (en)
Inventor
Tetsuya Ishizeki
Atsuo Inoue
Masato Tsuboi
Kenichi Suzuki
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sanden Corp
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Assigned to SANDEN CORPORATION reassignment SANDEN CORPORATION ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: INOUE, ATSUO, ISHIZEKI, TETSUYA, SUZUKI, KENICHI, TSUBOI, MASATO
Publication of US20120125026A1 publication Critical patent/US20120125026A1/en
Abandoned legal-status Critical Current

Links

Images

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/06—Control using electricity
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/00485—Valves for air-conditioning devices, e.g. thermostatic valves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3236—Cooling devices information from a variable is obtained
    • B60H2001/3248—Cooling devices information from a variable is obtained related to pressure
    • B60H2001/3254—Cooling devices information from a variable is obtained related to pressure of the refrigerant at an expansion unit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60H—ARRANGEMENTS OF HEATING, COOLING, VENTILATING OR OTHER AIR-TREATING DEVICES SPECIALLY ADAPTED FOR PASSENGER OR GOODS SPACES OF VEHICLES
    • B60H1/00—Heating, cooling or ventilating [HVAC] devices
    • B60H1/32—Cooling devices
    • B60H2001/3286—Constructional features
    • B60H2001/3297—Expansion means other than expansion valve

Definitions

  • the present invention relates to an air conditioning system for vehicles, and specifically, to an improvement of an air conditioning system for vehicles which can accurately estimate a refrigerant flow rate in its refrigeration cycle and, via the estimation, can accurately estimate a compressor torque, and which can achieve those easily by a compact structure.
  • a refrigerant flow rate at that time is effective for the estimation of a compressor torque, and if the refrigerant flow rate can be estimated accurately, the compressor torque can also be accurately estimated.
  • an air conditioning system for vehicles because it is required to be installed in a limited space such as an engine compartment, it is strongly required to make the air conditioning system for vehicles small-sized and reduce the cost thereof.
  • a prime mover for a vehicle is frequently used for driving a compressor in a refrigeration cycle, there may be a case where a power capable of being used for the drive of the compressor is restricted for controlling the prime mover for the vehicle for running the vehicle. Therefore, it is important to estimate a compressor torque in a refrigeration cycle more accurately also for control and saving of fuel consumption for vehicle side, etc.
  • a method for intentionally providing a particular pressure difference detection means in a refrigerant path, estimating a refrigerant flow rate from the detected pressure difference and estimating a compressor torque from the estimated refrigerant flow rate in spite of a strong requirement of an accurate estimation of a compressor torque in a refrigeration cycle is not a general method. Therefore, for the purpose of estimating an accurate compressor torque finally, unless a design is performed in consideration of requirement specular in an air conditioning system for vehicles, that is, space saving and cost down, further, contribution to saving of fuel consumption of a vehicle, it is difficult to obtain an optimum formation.
  • an object of the present invention is to provide an air conditioning system for vehicles wherein an orifice is disposed at an optimum position in a refrigeration cycle, a refrigerant flow rate used for estimation of a compressor torque can be accurately estimated by accurately detecting a difference between pressures at upstream and downstream positions of the orifice which has a high correlation with the refrigerant flow rate, ultimately, the compressor torque can be estimated accurately, and by performing this estimation based on detection by a pressure difference detection means assembled efficiently in a particular place at an optimum form, space saving and cost down can be achieved and ultimately the estimation can contribute to saving of fuel consumption of a vehicle.
  • an air conditioning system for vehicles having a refrigeration cycle provided with a refrigerant compressor, a condenser for condensing compressed refrigerant, a pressure reduction/expansion mechanism for reducing in pressure and expanding refrigerant sent from the condenser and an evaporator for evaporating refrigerant sent from the pressure reduction/expansion mechanism, is characterized in that an orifice for throttling a refrigerant flow is disposed in a refrigerant path between the condenser and the pressure reduction/expansion mechanism, a pressure difference detection means capable of detecting a pressure difference between pressures at upstream and downstream positions of the orifice in a refrigerant flow direction is provided, and provided are a refrigerant flow rate estimation means for estimating a refrigerant flow rate with reference to a pressure difference detected by the pressure difference detection means and a compressor torque estimation means for estimating a compressor torque with reference to a refrigerant flow
  • the detection of a pressure difference between pressures at upstream and downstream positions of the orifice in the refrigerant flow direction which becomes a basis for accurate estimation of the refrigerant flow rate, ultimately, for accurate estimation of the compressor torque, can be stably performed efficiently and accurately by disposing the orifice at an optimum position in the refrigeration cycle, namely, at a refrigerant path between the condenser and the pressure reduction/expansion mechanism whose refrigerant condition is in a stable condition that is formed mainly from a liquid phase.
  • the pressure difference detection means including the orifice
  • by adding a particular device as described later it becomes possible to easily dispose it at a predetermined position while achieving space saving, and it also becomes possible to achieve cost down for the pressure difference detection means itself and the assembly thereof.
  • the pressure difference between pressures at upstream and downstream positions of the orifice is detected in a region in which the refrigerant is mainly in a liquid phase, and an accurate detection of the pressure difference can be performed efficiently.
  • the accurate detection of the pressure difference enables an accurate estimation of the refrigerant flow rate, and ultimately, enables an accurate estimation of the compressor torque.
  • this air conditioning system for vehicles it is important how space saving and cost down can be achieved, and in order to achieve this efficiently, it is preferred to employ a structure wherein a tube for forming a part of the above-described refrigerant path between the condenser and the pressure reduction/expansion mechanism and the above-described pressure difference detection means are formed as an integrated unit, and the orifice is disposed in the unit.
  • a desirable detection of the pressure difference becomes possible only by assembling the integrated unit at a predetermined position in the refrigeration cycle, namely, at a position of the refrigerant path between the condenser and the pressure reduction/expansion mechanism, thereby easily achieving space saving and cost down.
  • a structure wherein a sight glass capable of observing an inside of the refrigerant path is further provided to the above-described integrated unit.
  • the condition in the refrigerant path can be easily observed, and for example, in a case where bubbles are observed in the refrigerant path, it can be securely determined that the amount of refrigerant in the refrigeration cycle tends to lack, and it becomes possible to take a measure such as supplement of refrigerant.
  • a structure can be employed wherein the above-described pressure difference detection means detects the pressure difference by calculating a difference between pressures detected by a first pressure sensor for detecting a pressure at an upstream position of the orifice in the refrigerant flow direction and a second pressure sensor, different from the first pressure sensor, for detecting a pressure at a downstream position of the orifice in the refrigerant flow direction.
  • the first pressure sensor and the second pressure sensor can detect respective pressures independently from each other, and by determining a difference between both detected amounts, a desired pressure difference can be calculated and detected.
  • the above-described refrigerant flow rate estimation means also can estimate the refrigerant flow rate with reference to the pressure difference detected by the pressure difference detection means and with reference to amounts detected by the first pressure sensor and/or the second pressure sensor. In such a manner, it becomes possible to estimate the refrigerant flow rate at a condition where an absolute value of a pressure at a detection position and a refrigerant condition accompanying with the absolute value are added to the pressure difference, and it becomes possible to estimate the refrigerant flow rate more accurately.
  • compressor torque estimation means estimates the compressor torque with reference to a refrigerant flow rate estimated by the refrigerant flow rate estimation means, a physical amount having a correlation with a suction pressure of the compressor, a physical amount having a correlation with a rotational speed of the compressor and an amount detected by the first pressure sensor.
  • a structure can be employed wherein the above-described pressure difference detection means detects the pressure difference by a pressure difference sensor for directly detecting a pressure difference between pressures at upstream and downstream positions of the orifice in the refrigerant flow direction.
  • a pressure difference sensor for directly detecting a pressure difference between pressures at upstream and downstream positions of the orifice in the refrigerant flow direction.
  • Such a structure for the refrigeration cycle in the present invention may be suitable particularly for an air conditioning system for vehicles for which space saving and cost down are strongly required. Further, if a structure is employed wherein a signal of the compressor torque estimated by the above-described compressor torque estimation means is sent to a control unit for a drive source of the compressor (for example, a control unit for a vehicle engine), an amount of power capable of being used for driving the compressor in the drive source can be properly determined, a more adequate control as the whole of the vehicle becomes possible, and it can contribute also to saving of fuel consumption of the vehicle, etc. more appropriately.
  • a control unit for a drive source of the compressor for example, a control unit for a vehicle engine
  • the pressure difference detection means including the orifice is assembled efficiently at an optimum position in the refrigeration cycle, the pressure difference between pressures at upstream and downstream positions of the orifice can be detected accurately, and a refrigerant flow rate having a high correlation with the pressure difference, ultimately, a compressor torque, can be estimated accurately. Then, by adding a device to the structure of the pressure difference detection means including the orifice and the form for assembly thereof, in particular, by forming it as an integrated unit, space saving and cost down as the whole of the refrigeration cycle can be achieved more securely while satisfying the function up to the accurate estimation of the compressor torque, and an optimum formation for an air conditioning system for vehicles can be realized.
  • FIG. 1 is a schematic diagram of a refrigeration cycle in an air conditioning system for vehicles according to an embodiment of the present invention.
  • FIG. 2 is a schematic diagram of a pressure difference detection means disposed in the refrigeration cycle depicted in FIG. 1 .
  • FIG. 3 is an appearance perspective view of the pressure difference detection means depicted in FIG. 2 .
  • FIG. 4 depicts diagrams in characteristics showing examples of P-h diagrams of the refrigeration cycle depicted in FIG. 1 .
  • FIG. 1 shows a schematic structure of a refrigeration cycle in an air conditioning system for vehicles according to an embodiment of the present invention.
  • symbol 1 indicates the whole of a refrigeration cycle
  • refrigeration cycle 1 has a compressor 2 for compressing refrigerant, a condenser 3 for condensing the compressed refrigerant, an expansion valve 4 as a pressure reduction/expansion mechanism for pressure reducing and expanding the refrigerant sent from the condenser 3 , and an evaporator 5 for evaporating the refrigerant sent from the expansion valve 4 .
  • an orifice for throttling the flow of refrigerant is provided, and a pressure difference detection means 7 capable of detecting a pressure difference between pressures at the upstream and downstream positions of the orifice in the direction of the refrigerant flow is provided.
  • pressure difference detection means 7 is formed as shown in FIG. 2 , and is formed as an integrated unit 11 wherein an orifice 8 for throttling the flow of refrigerant in the arrow direction is assembled in the inside, and a first pressure sensor 9 and a second pressure sensor 10 detecting the pressures at the respective upstream and downstream positions of the orifice 8 in the refrigerant flow direction are formed integrally.
  • a difference between amounts detected both sensors 9 , 10 of first pressure sensor 9 positioned at the upstream side of orifice 8 and second pressure sensor 10 positioned at the downstream side of orifice 8 is calculated by a pressure difference calculation means 11 as a pressure difference to be detected in the present invention.
  • the detection of the pressure difference can also be performed by a pressure difference sensor (not shown) for directly detecting the pressure difference between pressures at upstream and downstream positions of orifice 8 in the refrigerant flow direction, other than the structure where first pressure sensor 9 and second pressure sensor 10 independent from each other are provided as described above.
  • Symbol 12 indicates a refrigerant flow rate estimation means, and it estimates a refrigerant flow rate with reference to the pressure difference calculated (detected) by pressure difference calculation means 11 (pressure difference detection means).
  • pressure difference calculation means 11 pressure difference detection means.
  • the torque of compressor 2 is estimated by compressor torque estimation means 13 with reference to the refrigerant flow rate estimated by the above-described refrigerant flow rate estimation means 12 .
  • This estimation of the torque of compressor 2 can be carried out, for example, by estimating the compressor torque with reference to the refrigerant flow rate estimated by refrigerant flow rate estimation means 12 , a physical amount having a correlation with a suction pressure of compressor 2 (for example, a physical amount detected by a suction pressure sensor), a physical amount having a correlation with a rotational speed of compressor 2 , and the amount detected by the above-described first pressure sensor 9 .
  • orifice 8 for throttling the flow of refrigerant, which has passed through condenser 3 , in a specified region in refrigeration cycle 1 and accurately detecting a pressure difference between pressures at upstream and downstream positions of the orifice 8 , the refrigerant flow rate having a high correlation with the pressure difference, ultimately, the compressor torque, can be estimated accurately. Further, by forming orifice 8 and first pressure sensor 9 and second pressure sensor 10 as integrated unit 11 , while achieving a desired detection of pressure difference, facilitation of assembly of these at predetermined positions, and space saving and cost down as the whole of the refrigeration cycle, can be achieved securely.
  • a structure can also be employed wherein a sight glass 14 is provided to the above-described integrated unit 11 and the inside of refrigerant path 6 can be appropriately observed through the sight glass 14 .
  • the condition in refrigerant path 6 can be easily observed, and as aforementioned, for example, in case where bubbles are observed in refrigerant path 6 , it can be determined that the amount of refrigerant in refrigeration cycle 1 tends to lack, and it becomes possible to take an appropriate measure such as supplement of refrigerant.
  • refrigeration cycle 1 in the air conditioning system for vehicles according to the present invention can be represented by a P-h diagram, for example, as shown in FIGS. 4 (A) and (B).
  • orifice 8 provided on predetermined refrigerant path 6 , a pressure difference between the upstream and downstream sides of the orifice can be forcibly given, and it becomes possible to estimate a refrigerant flow rate having a high correlation with the pressure difference, ultimately, a compressor torque.
  • the stable and accurate detection of the pressure difference between the upstream and downstream sides of the orifice may contribute to an accurate estimation of refrigerant flow rate and an accurate estimation of compressor torque.
  • the air conditioning system for vehicles according to the present invention can be applied to any air conditioning system for vehicles requiring to accurately estimate a compressor torque, and in particular, it is suitable for a case where space saving and cost down are required.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Air-Conditioning For Vehicles (AREA)
US13/388,040 2009-07-30 2010-07-20 Air Conditioning System for Vehicle Abandoned US20120125026A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2009-177993 2009-07-30
JP2009177993A JP2011031679A (ja) 2009-07-30 2009-07-30 車両用空調装置
PCT/JP2010/062189 WO2011013541A1 (ja) 2009-07-30 2010-07-20 車両用空調装置

Publications (1)

Publication Number Publication Date
US20120125026A1 true US20120125026A1 (en) 2012-05-24

Family

ID=43529200

Family Applications (1)

Application Number Title Priority Date Filing Date
US13/388,040 Abandoned US20120125026A1 (en) 2009-07-30 2010-07-20 Air Conditioning System for Vehicle

Country Status (5)

Country Link
US (1) US20120125026A1 (ja)
EP (1) EP2460677A4 (ja)
JP (1) JP2011031679A (ja)
CN (1) CN102470727A (ja)
WO (1) WO2011013541A1 (ja)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102635989A (zh) * 2012-03-22 2012-08-15 奇瑞汽车股份有限公司 一种汽车空调保护系统及其控制方法
EP2965932B1 (en) * 2013-03-06 2019-05-08 Panasonic Intellectual Property Management Co., Ltd. Vehicle air conditioning device
KR20230111650A (ko) * 2022-01-17 2023-07-26 두원중공업(주) 차량용 압축기의 구동 토크 예측 장치 및 그 방법

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5628206A (en) * 1994-04-01 1997-05-13 Nippondenso Co., Ltd. Refrigerant condenser
JP2005016352A (ja) * 2003-06-24 2005-01-20 Sanden Corp 圧縮機出力算出装置およびそれを用いた制御装置
US20050109113A1 (en) * 2003-11-25 2005-05-26 Denso Corporation Pressure sensor
US20080104984A1 (en) * 2006-10-27 2008-05-08 Akinobu Kanai Structure for sensing refrigerant flow rate in a compressor
US20080221822A1 (en) * 2004-08-13 2008-09-11 Marc Laverdiere System and Method for Calibration of a Flow Device

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH06281300A (ja) 1993-03-29 1994-10-07 Toshiba Corp 空気調和装置
JPH08219595A (ja) * 1995-02-17 1996-08-30 Nippondenso Co Ltd フィルタ装置、および冷凍装置
JP4513241B2 (ja) * 2001-08-09 2010-07-28 株式会社デンソー 減圧装置
JP4119143B2 (ja) * 2002-03-22 2008-07-16 カルソニックカンセイ株式会社 可変容量コンプレッサの駆動トルク算出装置
FR2840259B1 (fr) * 2002-05-31 2004-08-27 Valeo Climatisation Installation de climatisation de vehicule munie d'un dispositif electronique de controle
FR2862573B1 (fr) * 2003-11-25 2006-01-13 Valeo Climatisation Installation de climatisation de vehicule
JP2008133996A (ja) * 2006-11-28 2008-06-12 Sanden Corp 車両用冷房装置
JP2009063179A (ja) * 2007-09-04 2009-03-26 Sanden Corp 圧縮機の駆動トルク演算装置及び可変容量圧縮機の容量制御システム

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5628206A (en) * 1994-04-01 1997-05-13 Nippondenso Co., Ltd. Refrigerant condenser
JP2005016352A (ja) * 2003-06-24 2005-01-20 Sanden Corp 圧縮機出力算出装置およびそれを用いた制御装置
US20050109113A1 (en) * 2003-11-25 2005-05-26 Denso Corporation Pressure sensor
US20080221822A1 (en) * 2004-08-13 2008-09-11 Marc Laverdiere System and Method for Calibration of a Flow Device
US20080104984A1 (en) * 2006-10-27 2008-05-08 Akinobu Kanai Structure for sensing refrigerant flow rate in a compressor

Also Published As

Publication number Publication date
EP2460677A4 (en) 2013-09-25
CN102470727A (zh) 2012-05-23
JP2011031679A (ja) 2011-02-17
EP2460677A1 (en) 2012-06-06
WO2011013541A1 (ja) 2011-02-03

Similar Documents

Publication Publication Date Title
US20120125041A1 (en) Refrigeration Cycle
JP4558060B2 (ja) 冷凍サイクル装置
US6997000B2 (en) Refrigeration system and method of operation therefor
US20130086932A1 (en) Vehicle Air-Conditioning Device, and Refrigerant Leakage Diagnosis Method for Vehicle Air-Conditioning Device
US7891204B2 (en) Refrigeration cycle device for vehicle
CN107250690B (zh) 膨胀阀装置
JP5610674B2 (ja) 冷凍装置
JP4982326B2 (ja) 車両用空調装置
US20120125025A1 (en) Refrigeration Cycle
US20120125026A1 (en) Air Conditioning System for Vehicle
EP1491375A2 (en) Compressor output calculation unit and control unit using the same
JP5859299B2 (ja) 圧縮機の駆動トルク推定装置及びこれに用いる凝縮器
JP2009008063A (ja) 可変容量コンプレッサの制御装置
EP1489369A1 (en) Unit for calculating refrigerant suction pressure of compressor in refrigeration cycle
JP3921430B2 (ja) コンプレッサトルク推定装置
US20060073047A1 (en) Method for estimating drive torque of variable displacement compressor and system for controlling drive source rotation speed
JP6085791B2 (ja) 流量センサ
JP2006138314A (ja) 可変容量コンプレッサのトルク算出装置及びトルク算出方法
JP5119071B2 (ja) 冷凍サイクル装置の制御装置
JP2004115012A (ja) 制御装置を備える空調機
EP1491374A2 (en) Unit for calculating torque in refrigeration cycle and control unit using the same
JP2008209019A (ja) オイル量測定装置
JP2006001505A (ja) 車両用空調装置
JP2010023582A (ja) 冷凍サイクル装置
US20120210738A1 (en) Method For Controlling The Operation Of An Air-Conditioning Loop In A Vehicle

Legal Events

Date Code Title Description
AS Assignment

Owner name: SANDEN CORPORATION, JAPAN

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:ISHIZEKI, TETSUYA;INOUE, ATSUO;TSUBOI, MASATO;AND OTHERS;REEL/FRAME:027641/0262

Effective date: 20120112

STCB Information on status: application discontinuation

Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION