CN1216260C - Car air-conditioner evaporator refrigerating agent flow control system - Google Patents
Car air-conditioner evaporator refrigerating agent flow control system Download PDFInfo
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- CN1216260C CN1216260C CN 03141547 CN03141547A CN1216260C CN 1216260 C CN1216260 C CN 1216260C CN 03141547 CN03141547 CN 03141547 CN 03141547 A CN03141547 A CN 03141547A CN 1216260 C CN1216260 C CN 1216260C
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Abstract
The present invention relates to a car air-conditioner refrigerating agent flow rate control system which uses an electronic expansion valve as a flow rate adjusting mechanism of a refrigerating agent. Temperature sensors are placed at an inlet and an outlet of an evaporator to respectively measure the temperature of the inlet and the outlet of the evaporator. A sum of a difference of the inlet and the outlet and a superheat degree correction value of the inner pressure of the evaporator is used as the actual superheat degree of the evaporator. The deviation of the actual superheat degree of the evaporator and the set superheat degree is used as a superheat degree feedback signal of the evaporator to be transmitted in a controller, and simultaneously, the rotary speed of a compressor is used as a feedforward signal to be transmitted in the controller. The controller controls the opening degree of the electronic expansion valve according to the feedforward signal of the rotary speed of the compressor and the superheat degree feedback signal of the evaporator so that the superheat degree of the evaporator is at an optimum value. The present invention enhances the heat exchanging efficiency of the evaporator and prevents the large superheat degree of the evaporator and efficiency reduction. The present invention has the advantages of less superheat degree and easy liquid hammer of the compressor and ensures that the evaporator is supplied with the proper flow rate of the refrigerating agent.
Description
Technical field
What the present invention relates to is a kind of sedan air conditioner evaporator refrigerant flow control system, particularly a kind of employing electric expansion valve is as throttle mechanism, the aperture of feed-forward signal by compressor rotary speed and the feedback signal of evaporator superheat control electric expansion valve, guarantee to supply with the control system of the suitable refrigerant flow of evaporator, belong to the automobile air conditioning technology field.
Technical background
The automobile air-conditioning evaporator refrigerant flow control adopts heating power expansion valve and restriction sleeve usually, compressor is compressed into high pressure with refrigerant, hi-heat gas, through becoming the liquid of High Temperature High Pressure after the condenser condenses, high temperature, high-voltage refrigerant liquid enters the reservoir trailing portion and is stored in the reservoir, part enters evaporator through the regulating action of heating power expansion valve, evaporation becomes refrigerant gas in evaporator, enter compressor, thereby finish a refrigerating cycle, because the operating lag of heating power expansion valve bulb, response lag, make the thermal load of the car speed of a motor vehicle or car chamber change suddenly, heating power expansion valve has little time the variation of responding system, possible partially liq can not evaporate in evaporator fully, enters compressor, and the compressor liquid hammer takes place easily.In actual applications, in order to address this problem, be cost to sacrifice degree of superheating usually, the degree of superheating setting value is higher 3～5 ℃ than optimal operating condition, the refrigeration system maximum capacity often can not be given full play to like this, and refrigerating efficiency reduces, and system can't move under optimum state.The restriction sleeve system compares with the thermal expansion valve system, movement-less part, and the reliability height, but in a single day select, can't regulate the flow of refrigerant with the variation of condition of service.Sedan air conditioner is a non-self-contained air-conditioner system, and the rotating speed of compressor changes with engine speed, and when the car speed of a motor vehicle changed suddenly, the maximum speed of revolution of compressor may be low-tach 6～7 times.In the process that compressor rotary speed changes significantly, if can not in time regulate the flow of refrigerant, guarantee suitable degree of superheating, phenomenons such as compressor liquid hammer or evaporator superheat be excessive may appear, had a strong impact on the stability and the traveling comfort of system.
Summary of the invention
For deficiency and the defective that overcomes prior art, the present invention has designed a kind of employing electric expansion valve as throttle mechanism, the aperture of feed-forward signal by compressor rotary speed and the feedback signal of evaporator superheat control electric expansion valve, guarantee to supply with the control system of the suitable refrigerant flow of evaporator, prevent compressor generation liquid hammer, make sedan air conditioner be in operation under the optimum state.
The present invention includes driving circuit, controller and the feedforward compensation link of compressor, condenser, reservoir, electric expansion valve, evaporator fan, evaporator, evaporator outlet temperature sensor, evaporator temperature sensor, compressor rotary speed sensor, AD modular converter, electric expansion valve.The outlet of compressor links to each other with the import of condenser, the outlet of condenser links to each other with the import of reservoir, the outlet of reservoir links to each other with the import of electric expansion valve, the outlet of electric expansion valve links to each other with the import of evaporator, the outlet of evaporator connects the import of compressor, the evaporator temperature sensor is close on the tube wall of evaporator, and its mouth is electrically connected with the input end of A/D modular converter; The evaporator outlet temperature sensor is close on the tube wall of evaporator outlet, and its mouth is electrically connected with the input end of A/D modular converter; The mouth of A/D modular converter is electrically connected with controller, compressor links to each other with motorcar engine by magnetic clutch, the mouth that is installed in the compressor rotary speed sensor on magnetic clutch next door is electrically connected with the input end of feedforward compensation link, the mouth of feedforward compensation link is electrically connected with controller, the input end of the driving circuit of electric expansion valve is electrically connected with controller, and the mouth of the driving circuit of electric expansion valve is electrically connected with electric expansion valve.Its middle controller comprises program memory ROM, data memory RAM and central processing unit CPU.Be positioned at evaporator and import and export the temperature that two temperature sensors on the tube wall are measured the evaporator import and export respectively, both heal differentials add the degree of superheating of the cooresponding super heat value of the differential pressure of evaporator (being about 2 ℃) expression evaporator.The degree of superheating of evaporator and the feedback signal of the deviation of setting degree of superheating as evaporator superheat are sent into controller, simultaneously with the compressor rotary speed that collects as feed-forward signal, after the output of feedforward compensation link, send into controller.Controller send the driving circuit of electric expansion valve the output signal addition of feedback signal and feedforward compensation link, the aperture of control electric expansion valve, thereby the flow of control evaporator refrigerant.
In the sedan air conditioner system, owing to adopt the control element of electric expansion valve as refrigerant flow, operation characteristic according to sedan air conditioner, adopt compressor rotary speed as the deviation of feed-forward signal and evaporator superheat as feedback signal, in time control the flow of refrigerant, overcome the limitation of heating power expansion valve and restriction sleeve, the heat interchanging area of evaporator is fully used, improve the heat exchange efficiency of evaporator, avoided evaporator superheat excessive, decrease in efficiency; Degree of superheating is too small, and liquid hammer takes place compressor easily, guarantees the stability of sedan air conditioner system and the traveling comfort of sedan air conditioner.
Description of drawings
Fig. 1 is the schematic diagram of sedan air conditioner evaporator refrigerant flow control system.
1 is compressor among the figure, and 2 is condenser, and 3 is reservoir, 4 is electric expansion valve, 5 is evaporator fan, and 6 is evaporator, and 7 is the evaporator outlet temperature sensor, 8 is the evaporator temperature sensor, 9 is the compressor rotary speed sensor, and 10 is the AD modular converter, and 11 is controller, 12 is the driving circuit of electric expansion valve, and 13 is the feedforward compensation link.
The specific embodiment
Below in conjunction with accompanying drawing concrete enforcement of the present invention is further described
As shown in Figure 1, the present invention mainly comprises: compressor 1, condenser 2, reservoir 3, electric expansion valve 4, evaporator fan 5, evaporator 6, evaporator outlet temperature sensor 7, evaporator temperature sensor 8, compressor rotary speed sensor 9, AD modular converter 10, controller 11, the driving circuit 12 of electric expansion valve, feedforward compensation link 13.The outlet of compressor 1 links to each other with the import of condenser 2, the outlet of condenser 2 links to each other with the import of reservoir 3, the outlet of reservoir 3 links to each other with the import of electric expansion valve 4, and the outlet of electric expansion valve 4 links to each other with the import of evaporator 6, and the outlet of evaporator 6 connects the import of compressor 1.Evaporator import and export temperature sensor 8,7 adopts thermally dependent resistor.Evaporator temperature sensor 8 is close on the tube wall of evaporator 6 imports, and its mouth is electrically connected with the input end of A/D modular converter 10; Evaporator outlet temperature sensor 7 is close on the tube wall of evaporator 6 outlets, and its mouth is electrically connected with the input end of A/D modular converter 10; The mouth of A/D modular converter 10 is electrically connected with controller 11, and controller 11 mainly comprises program memory ROM, data memory RAM and central processing unit CPU.Compressor links to each other with motorcar engine by magnetic clutch, the compressor rotary speed sensor 9 that is installed in the magnetic clutch next door ends lock sensor for magneto-electric, the mouth of compressor rotary speed sensor 9 is electrically connected with the input end of feedforward compensation link 13, the mouth of feedforward compensation link 13 is electrically connected with controller 11, the input end of the driving circuit 12 of electric expansion valve is electrically connected with controller 11, and the mouth of the driving circuit 12 of electric expansion valve is electrically connected with electric expansion valve 4.
High-temperature high-pressure refrigerant gas from compressor 1 comes out after condenser 2 condensations, enters reservoir 3, the refrigerant that comes out from reservoir 3 is through the throttling of electric expansion valve 4, enter evaporator 6 evaporations, get back to compressor 1, finish a refrigerating cycle from the refrigerant gas that evaporator 6 comes out.Evaporator fan 5 is sent into the car chamber with air through evaporator 6, regulates the air-conditioned coach indoor temperature.Compressor rotary speed sensor 9 with compressor rotary speed as feed-forward signal, after 13 outputs of feedforward compensation link, send into controller 11, simultaneously the degree of superheating of evaporator is sent into controller 11 with the deviation of setting degree of superheating as the feedback signal of evaporator superheat, controller 11 is the output addition of feedback output and feedforward compensation link 13, send into the driving circuit 12 of electric expansion valve, the aperture of control electric expansion valve, thereby the flow of control evaporator refrigerant.
Claims (2)
1. sedan air conditioner evaporator refrigerant flow control system, mainly comprise compressor (1), condenser (2), reservoir (3), electric expansion valve (4), evaporator fan (5), evaporator (6), evaporator outlet temperature sensor (7), evaporator temperature sensor (8), compressor rotary speed sensor (9), A/D modular converter (10), controller (11), the driving circuit of electric expansion valve (12), feedforward compensation link (13), it is characterized in that adopting electric expansion valve as refrigerant flow regulating mechanism, the aperture of feed-forward signal by compressor rotary speed and evaporator superheat feedback signal control electric expansion valve, control the evaporator refrigerant flow, the outlet of compressor (1) links to each other with the import of condenser (2), and the outlet of condenser (2) links to each other with the import of reservoir (3), and the outlet of reservoir (3) links to each other with the import of electric expansion valve (4), the outlet of electric expansion valve (4) links to each other with the import of evaporator (6), the outlet of evaporator (6) connects the import of compressor (1), and evaporator temperature sensor (8) is close on the tube wall of evaporator (6) import, and its mouth is electrically connected with the input end of A/D modular converter (10); Evaporator outlet temperature sensor (7) is close on the tube wall of evaporator (6) outlet, and its mouth is electrically connected with the input end of A/D modular converter (10); The mouth of A/D modular converter (10) is electrically connected with controller (11), compressor (1) links to each other with motorcar engine by magnetic clutch, the mouth that is installed in the compressor rotary speed sensor (9) on magnetic clutch next door is electrically connected with the input end of feedforward compensation link (13), the mouth of feedforward compensation link (13) is electrically connected with controller (11), the input end of the driving circuit of electric expansion valve (12) is electrically connected with controller (11), and the mouth of the driving circuit of electric expansion valve (12) is electrically connected with electric expansion valve (4).
2. sedan air conditioner evaporator refrigerant flow control system according to claim 1, its feature is that also evaporator out temperature sensor (8,7) adopts thermally dependent resistor, controller (11) mainly comprises program memory ROM, data memory RAM and central processing unit CPU, and compressor rotary speed sensor (9) ends lock sensor for magneto-electric.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03141547 CN1216260C (en) | 2003-07-10 | 2003-07-10 | Car air-conditioner evaporator refrigerating agent flow control system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 03141547 CN1216260C (en) | 2003-07-10 | 2003-07-10 | Car air-conditioner evaporator refrigerating agent flow control system |
Publications (2)
| Publication Number | Publication Date |
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| CN1477355A CN1477355A (en) | 2004-02-25 |
| CN1216260C true CN1216260C (en) | 2005-08-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 03141547 Expired - Fee Related CN1216260C (en) | 2003-07-10 | 2003-07-10 | Car air-conditioner evaporator refrigerating agent flow control system |
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| WO2005098328A1 (en) * | 2004-04-09 | 2005-10-20 | Matsushita Electric Industrial Co. Ltd. | Drying equipment |
| CN100406820C (en) * | 2005-01-20 | 2008-07-30 | 松下电器产业株式会社 | Refrigeration circulating system and control method thereof |
| JP3988780B2 (en) * | 2005-09-09 | 2007-10-10 | ダイキン工業株式会社 | Refrigeration equipment |
| CN1987257B (en) * | 2005-12-22 | 2010-05-05 | 乐金电子(天津)电器有限公司 | Heating operation method for composite air conditioner |
| CN100454186C (en) * | 2006-07-13 | 2009-01-21 | 天津大学 | Constant-temperature and constant humidity store house variable capacity automatic controlling system |
| CN201272224Y (en) * | 2008-09-01 | 2009-07-15 | 浙江吉利控股集团有限公司 | Vehicle mounted independent air conditioner system of electric automobile |
| CN101852523B (en) * | 2009-03-31 | 2012-01-11 | 海尔集团公司 | Superheat degree control method and system for refrigeration circulation system |
| CN101876471B (en) * | 2009-04-30 | 2012-11-21 | 比亚迪股份有限公司 | Control method for air conditioning refrigerating system of automobile |
| DE102011053256A1 (en) * | 2011-09-05 | 2013-03-07 | Dr. Ing. H.C. F. Porsche Aktiengesellschaft | Refrigeration circuit for use in a motor vehicle |
| CN103033004B (en) * | 2011-09-29 | 2016-03-30 | 杭州三花研究院有限公司 | A kind of control method of automotive air-conditioning system electric expansion valve |
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| CN102444961B (en) * | 2011-12-05 | 2014-08-27 | Tcl空调器(中山)有限公司 | Air-conditioning temperature control device and temperature collecting method thereof |
| CN103245154B (en) * | 2012-02-09 | 2016-08-31 | 杭州三花研究院有限公司 | A kind of control method of automotive air-conditioning system electric expansion valve |
| CN103423835B (en) * | 2012-04-24 | 2017-04-12 | 杭州三花研究院有限公司 | Control method of vehicle air-conditioning system and vehicle air-conditioning system |
| CN103423836B (en) * | 2012-04-24 | 2018-03-13 | 杭州三花研究院有限公司 | Vehicle air conditioner control method for overheat and vehicle air conditioner |
| CN103277876B (en) * | 2013-06-24 | 2016-03-23 | 苏州翔箭智能科技有限公司 | The control method of the electric expansion valve in air-conditioning system |
| CN104515270B (en) * | 2013-09-28 | 2018-12-11 | 杭州三花研究院有限公司 | A kind of air-conditioning system and its control method |
| JP6197657B2 (en) * | 2014-01-14 | 2017-09-20 | 株式会社デンソー | Thermal management system for vehicles |
| EP3268682B1 (en) | 2015-03-09 | 2022-08-24 | Carrier Corporation | Expansion valve control |
| CN105270143B (en) * | 2015-09-14 | 2017-08-25 | 北京汽车股份有限公司 | Vehicle-mounted fast cooling system and automobile |
| CN106016458B (en) * | 2016-05-31 | 2019-02-19 | 广东美的暖通设备有限公司 | Air conditioner and its mode switch control method |
| CN113199921B (en) * | 2021-06-08 | 2023-03-21 | 吉利汽车研究院（宁波）有限公司 | Pulsation adjusting structure and method of vehicle air conditioning system and vehicle |
| CN116222008A (en) * | 2022-12-30 | 2023-06-06 | 广州智业节能科技有限公司 | Automatic control system for cold station |
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- 2003-07-10 CN CN 03141547 patent/CN1216260C/en not_active Expired - Fee Related
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