CN102980262B - Electric automobile heat pump air conditioning system driven by variable frequency motor - Google Patents
Electric automobile heat pump air conditioning system driven by variable frequency motor Download PDFInfo
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- CN102980262B CN102980262B CN201210512903.9A CN201210512903A CN102980262B CN 102980262 B CN102980262 B CN 102980262B CN 201210512903 A CN201210512903 A CN 201210512903A CN 102980262 B CN102980262 B CN 102980262B
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Air-Conditioning For Vehicles (AREA)
Abstract
The invention relates to an electric automobile heat pump air conditioning system driven by a variable frequency motor and belongs to the technical field of air conditionings and vehicles. The electric automobile heat pump air conditioning system disclosed by the invention can simultaneously implement heating and refrigerating functions and can effectively utilize part of heat in the environment in a heating mode; compared with a conventional electric heating mode, the electric automobile heat pump air conditioning system has the characteristics of high energy efficiency, no potential safety hazard and the like; the electric automobile heat pump air conditioning system has a simple structure, is low in cost, is convenient to control in the using process and has is low in energy consumption; and meanwhile, the rotating speeds of the variable frequency motor and a vehicle indoor/outdoor heat exchanger fan can be regulated at any time according to a signal acquired by a vehicle indoor/outdoor temperature sensor, so that the system always works under the optimal working condition.
Description
Technical field
The present invention relates to the electric automobile heat-pump air-conditioning system that a kind of variable-frequency motor drives, belong to air-conditioning technical and automobile technical field.
Background technology
What the automotive air-conditioning system taking internal combustion engine as power adopted in the time freezing summer is steam compression cycle, and what when warm oneself winter, utilize is engine exhaust heat.And can be less for the waste heat utilizing in electric automobile, cannot meet the requirement of heating in winter.Under prior art condition, be the car indoor environment heating of electric automobile if adopt traditional electrical heating method, can, because energy consumption is compared with the high distance travelled that badly influences, therefore, be unfavorable for application and the popularization of electric automobile.
Summary of the invention
The present invention is directed to the electric automobile high shortcoming of energy consumption of warming oneself winter, propose a kind of variable-frequency motor that adopts steam compression cycle and drive electric automobile heat-pump air-conditioning system, for driver and crew provide comfortable environment.
The electric automobile heat-pump air-conditioning system that variable-frequency motor drives, mainly comprises variable-frequency motor, compressor, four-way change-over valve, car outdoor heat exchanger fan, car outdoor heat exchanger, the first expansion valve, the first check valve, the second check valve, the 3rd check valve, the 4th check valve, the second expansion valve, the first triple valve, the second triple valve, the 3rd triple valve, the 4th triple valve, car indoor temperature transmitter, car indoor heat exchanger, car indoor heat exchanger fan, control system, gas-liquid separator, the pressure sensor at car outdoor temperature sensor and exhaust outlet of compressor place.
In electric automobile heat-pump air-conditioning system of the present invention, the belt wheel of variable-frequency motor is connected by polywedge bet with the belt wheel of compressor, drives compressor operating.Air conditioning hose connects the entrance of four-way change-over valve for the exhaust outlet of compressor, and appropriate position setting pressure sensor in this flexible pipe, and air conditioning hose connects the outlet of gas-liquid separator for the air entry of compressor; Its excess-three mouth of four-way change-over valve is connected with outlet, the outlet of car outdoor heat exchanger and the entrance of gas-liquid separator of car indoor heat exchanger respectively with air conditioning hose; The entrance of car outdoor heat exchanger is connected with the first triple valve with copper pipe, all the other two mouthfuls of the first triple valve connect respectively the outlet of entrance and first expansion valve of the first check valve with copper pipe, the entrance of the first expansion valve is connected with copper pipe with the outlet of the second check valve simultaneously, the entrance of the outlet of the first check valve and the second check valve is connected with two mouthfuls of the second triple valve respectively with copper pipe; The entrance of car indoor heat exchanger is connected with wherein a bite of the 4th triple valve with copper pipe, all the other two mouthfuls are connected with the outlet of the second expansion valve and the entrance of the 4th check valve respectively with copper pipe, the entrance of the second expansion valve is connected with the outlet of the 3rd check valve with copper pipe, the outlet of the entrance of the 3rd check valve and the 4th check valve is connected with two mouthfuls of the 3rd triple valve respectively with copper pipe, finally the second triple valve is connected with air conditioning hose with the 3rd triple valve, forms the circuit system of sealing.Described control system is connected by shielding line with the pressure sensor at car outdoor temperature sensor, car indoor temperature transmitter and exhaust outlet of compressor place, and its output connects respectively variable-frequency motor, four-way change-over valve, car outdoor heat exchanger fan, car indoor heat exchanger fan.
Described control system comprises data acquisition module and object control module.The signal of data collecting module collected car indoor temperature, car outdoor temperature, Compressor Discharge Pressure, and sent in control system; Control system generates relevant control signal according to the data that gather, by the control of four-way change-over valve is realized to refrigeration mode or heating mode, by the control to variable-frequency motor, car outdoor heat exchanger fan, car indoor heat exchanger rotation speed of the fan, electric automobile heat-pump air-conditioning system is worked under the higher state of Energy Efficiency Ratio.
Described the first expansion valve is inner equilibrium formula expansion valve, reducing pressure by regulating flow, adjust flux in the time heating.The temperature-sensitive bag of the first expansion valve is fixed on the exit of car outdoor heat exchanger, experiences the degree of superheat of car outdoor heat exchanger exit working medium under heating mode, thereby the automatic aperture of variable expansion valve realizes the object of adjust flux.The flow adjustment range of the first expansion valve is large, and temperature control precision is high, and reaction speed is fast, good stability, and can protect compressor in the time that system brings into operation and be out of service.
Described the second expansion valve is inner equilibrium formula expansion valve, reducing pressure by regulating flow, adjust flux in the time of refrigeration.The temperature-sensitive bag of the second expansion valve is fixed on the exit of car indoor heat exchanger, experiences the aperture of the automatic variable expansion valve of the degree of superheat of car indoor heat exchanger exit working medium by temperature-sensitive bag, thereby reaches the object of adjust flux.The flow adjustment range of the second expansion valve is large, and temperature control precision is high, and reaction speed is fast, good stability, and can protect compressor in the time that system brings into operation and be out of service.
Described car outdoor heat exchanger serves as condenser under refrigeration mode, under heating mode, serves as evaporimeter.Meeting under the prerequisite of heat exchange amount, should make the volume of car outdoor heat exchanger as much as possible little, and there is shock resistance.
Described car indoor heat exchanger serves as evaporimeter under refrigeration mode, under heating mode, serves as condenser.Meeting under the prerequisite of heat exchange amount, should make the volume of car indoor heat exchanger as much as possible little, and there is shock resistance.
The workflow of electric automobile heat-pump air-conditioning system of the present invention is as follows:
When the higher car of environment temperature is indoor need to lower the temperature time, heat pump type air conditioning system starts, and control system makes the state of four-way change-over valve in power-off, now under refrigeration mode, works.The HTHP gaseous working medium of first being discharged by compressor enters car outdoor heat exchanger through four-way change-over valve, then from the first check valve and the 3rd check valve, enter the second expansion valve, then under the reducing pressure by regulating flow effect of the second expansion valve, enter evaporation endothermic in car indoor heat exchanger, reduce the indoor temperature of car, last working medium is inhaled in compressor and compresses through another passage of four-way change-over valve and gas-liquid separator, realizes kind of refrigeration cycle.Under refrigeration mode, working medium is without the first expansion valve, the second check valve and the 4th check valve.
In the time that heat pump type air conditioning system is started working under refrigeration mode, the main target of control system is to reduce as early as possible the indoor temperature of car, control system is according to the temperature signal of car indoor temperature transmitter and car outdoor temperature sensor, control variable-frequency motor, car indoor heat exchanger fan and car outdoor heat exchanger fan in lower operation at a high speed, now system is moved under the pattern of refrigerating capacity maximum; Along with the decline of car indoor temperature, control system will be taken into account the Energy Efficiency Ratio of system, controls variable-frequency motor, car indoor heat exchanger fan and car outdoor heat exchanger fan all in suitable rotating speed, and now system is preferably being moved under pattern; In the time that car indoor temperature drops to a certain scope, the target of control system is that system is worked under the highest Energy Efficiency Ratio, control system makes compressor, car indoor heat exchanger fan and car outdoor heat exchanger fan all in best rotating speed, and the indoor temperature of car is kept within the specific limits.Under refrigeration mode, the pressure sensor at compressor outlet place is sent into the signal collecting in control system, and too high when pressure at expulsion, in order to protect the parts such as compressor and system not damaged, control system is sent signal makes variable-frequency motor out of service.
When the lower car of environment temperature is indoor need to warm oneself time, heat pump type air conditioning system starts, and control system makes four-way change-over valve energising, and system is worked under heating mode.The HTHP gaseous working medium of first being discharged by compressor enters car indoor heat exchanger through four-way change-over valve, the heat being carried passes to the indoor air of car, thereby realize heating function, then working medium is entered in the first expansion valve by the 4th check valve, the second check valve, under the reducing pressure by regulating flow effect of expansion valve, enter in car outdoor heat exchanger, now working medium will absorb a part of heat from environment, another passage and gas-liquid separator finally by four-way change-over valve are got back in compressor, realize and heat circulation.Under heating condition, working medium is without the first check valve, the second expansion valve and the 3rd check valve.
In the time that heat pump type air conditioning system is started working under heating mode, the main target of control system is to improve as early as possible the indoor environment temperature of car, control system is according to the signal of car indoor temperature transmitter and car outdoor temperature sensor, control variable-frequency motor, car indoor heat exchanger fan and car outdoor heat exchanger fan all in lower operation at a high speed, now system is worked under the pattern of heating capacity maximum; Along with the rising of car indoor temperature, control system will be taken into account the Energy Efficiency Ratio of system, and the rotating speed of variable-frequency motor, car outdoor heat exchanger fan and car indoor heat exchanger fan is all in suitable rotating speed, and now system is preferably being moved under pattern; In car indoor temperature is elevated to a certain scope time, the target of control system is that system is worked under the highest Energy Efficiency Ratio, makes variable-frequency motor, car outdoor heat exchanger fan and car indoor heat exchanger fan in best rotating speed.Under heating mode, the pressure sensor at compressor outlet place is sent into the signal collecting in control system, and when pressure at expulsion is during higher than a certain value, control system is sent signal makes variable-frequency motor out of service.
Beneficial effect
Electric automobile heat-pump air-conditioning system of the present invention can be realized simultaneously and heating and refrigerating function, under heating mode, can effectively utilize a part of heat in environment, compared with traditional Electric heating, has Energy Efficiency Ratio higher, does not have the features such as potential safety hazard; And simple in structure, cost is low, it is convenient in the process using, to control, and energy consumption is low; Meanwhile, the signal that can collect according to car chamber inside/outside temperature sensor, regulate at any time variable-frequency motor and car indoor/rotating speed of external heat exchanger fan, carry out work thereby make system be in optimum operating mode always.
Brief description of the drawings
Fig. 1 is the structural representation of electric automobile heat-pump air-conditioning system of the present invention;
Fig. 2 be in detailed description of the invention electric automobile heat-pump air-conditioning system under refrigeration mode, the flow direction schematic diagram of working medium;
Fig. 3 be in detailed description of the invention electric automobile heat-pump air-conditioning system under heating mode, the flow direction schematic diagram of working medium;
Fig. 4 be in detailed description of the invention electric automobile heat-pump air-conditioning system in the time that heating mode moves, the relation of car average indoor temperature and time;
Fig. 5 be in detailed description of the invention electric automobile heat-pump air-conditioning system in the time that refrigeration mode moves, the relation of car average indoor temperature and time.
Label declaration: 1-compressor, 2-pressure sensor, 3-four-way change-over valve, 4-car outdoor heat exchanger fan, 5-car outdoor heat exchanger, 6-the first triple valve, 7-the first check valve, 8-the first expansion valve, 9-the second check valve, 10-the second triple valve, 11-the 3rd triple valve, 12-the 3rd check valve, 13-the second expansion valve, 14-the 4th check valve, 15-the 4th triple valve, 16-car indoor heat exchanger, 17-car indoor heat exchanger fan, 18-car indoor temperature transmitter, 19-control system, 20-gas-liquid separator, 21-car outdoor temperature sensor, 22-variable-frequency motor.
Detailed description of the invention
Below in conjunction with drawings and Examples, content of the present invention is described further objects and advantages of the present invention in order better to illustrate.
In the electric automobile heat-pump air-conditioning system of the present embodiment, what adopt is piston-type variable capacity compressors, car outdoor application be micro-channel heat exchanger, the indoor use of car be fin-tube type heat exchanger, under refrigerating/heating pattern, use respectively the expansion valve of two different models, and use copper pipe and air conditioning hose etc. that each several part is coupled together.
The refrigerating/heating function of native system is to realize by following measure:
The steam compression cycle heat pump type air conditioning system driving based on variable-frequency motor, comprise 1-compressor, 2-pressure sensor, 3-four-way change-over valve, 4-car outdoor heat exchanger fan, 5-car outdoor heat exchanger, 6-the first triple valve, 7-the first check valve, 8-the first expansion valve, 9-the second check valve, 10-the second triple valve, 11-the 3rd triple valve, 12-the 3rd check valve, 13-the second expansion valve, 14-the 4th check valve, 15-the 4th triple valve, 16-car indoor heat exchanger, 17-car indoor heat exchanger fan, 18-car indoor temperature transmitter, 19-control system, 20-gas-liquid separator, 21-car outdoor temperature sensor, 22-variable-frequency motor.The electric automobile heat-pump air-conditioning system being made up of above critical piece as shown in Figure 1.
When system is during in refrigeration mode, four-way change-over valve 3 no powers, its inner ac mouth communicates, and bd mouth communicates, and the flow direction of working medium is as shown in Figure 2.Under " suction " effect of compressor 1, gaseous working medium in car indoor heat exchanger 16 enters in compressor 1 through the bd of four-way change-over valve 3 mouth and gas-liquid separator 20, after compression, become the gaseous working medium of HTHP, enter in car outdoor heat exchanger 5 by the ac mouth of four-way change-over valve 3, under the effect of outdoor heat exchanger fan 4, carry out forced-convection heat transfer with environment, become the liquid refrigerant of middle temperature, now in car outdoor heat exchanger 5, can think approximate isobaric condensation, then working medium is through the first triple valve 6, the first check valve 7, the second triple valve 10, the 3rd triple valve 11, the 3rd check valve 12 enters in the second expansion valve 13, under the reducing pressure by regulating flow effect of the second expansion valve 13, the temperature and pressure of working medium further reduces, become after vaporific and enter and in car indoor heat exchanger 16, carry out evaporation endothermic through the 4th check valve 15, thereby reduce the indoor temperature of car, last working medium is through the bd of four-way change-over valve 3 mouth, gas-liquid separator 20 enters in compressor 1, complete kind of refrigeration cycle.Under this pattern, car outdoor heat exchanger 5 makees condenser and uses, and car indoor heat exchanger 16 makees evaporimeter and uses, and working medium does not flow through the first expansion valve 8, the second check valve 9 and the 4th check valve 14.
When system is during in heating mode, four-way change-over valve 3 is switched on, and its inner ab mouth communicates, and cd mouth communicates, and the flow direction of working medium as shown in Figure 3.The HTHP gaseous working medium of first discharging from compressor 1 enters car indoor heat exchanger 16 through the ab mouth of four-way change-over valve 3, under the effect of car indoor heat exchanger fan 17, the heat carrying is passed to the indoor air of car by working medium, thereby realize the function of heating, then working medium enters the 4th triple valve 15, the 4th check valve 14, the 3rd triple valve 11, the second triple valve 10, the second check valve 9, then after the reducing pressure by regulating flow of the first expansion valve 8, enter and in car outdoor heat exchanger 5, carry out evaporation endothermic, heat in environment is brought in system, last under the swabbing action of compressor 1, working medium is got back in compressor 1 through the cd of four-way change-over valve 3 mouth and gas-liquid separator 20, complete and heat circulation.Under this pattern, car outdoor heat exchanger 5 makees evaporimeter and uses, and car indoor heat exchanger 16 makees condenser and uses, and working medium does not flow through the first check valve 7, the 3rd check valve 12 and the second expansion valve 13.
When the starting stage of system in refrigerating/heating pattern, in order to make the indoor temperature of electric automobile reach as early as possible comfortable scope, now control system is sent control signal to car outdoor heat exchanger fan 4, car indoor heat exchanger fan 17 and variable-frequency motor 22, make its rotating speed the highest, thereby make refrigerating capacity or heating capacity maximum; In the time that the indoor temperature of car reaches certain limit, the target of control system is that heat pump type air conditioning system is worked under optimum pattern, and now control system is controlled the rotating speed of variable-frequency motor 22, car outdoor heat exchanger fan 4 and car indoor heat exchanger fan 17 automatically according to the signal of car indoor temperature transmitter 18 and car outdoor temperature sensor 21.In the time that Compressor Discharge Pressure is too high, control system quits work variable-frequency motor, thus protection system.
The electric automobile heat-pump air-conditioning system driving for variable-frequency motor has carried out heating test in the time that environment temperature is 1.6 DEG C and 5.5 DEG C, has carried out refrigeration test in the time that environment temperature is 30.1 DEG C and 36.5 DEG C.Under heating mode, the rotating speed of compressor remains on 1700RPM, and car is indoor/and external heat exchanger fan remains on 2000RPM, and Fig. 4 is car average indoor temperature relation over time.Under refrigeration mode, compressor rotary speed remains on 3400RPM, and car is indoor/and external heat exchanger fan also remains on 2000RPM, and Fig. 5 is car average indoor temperature relation over time.From Fig. 4 and Fig. 5: this system can realize heat-production functions preferably in winter, and can realize preferably refrigerating function summer.
The foregoing is only the preferred embodiment of native system, therefore do not limit protection scope of the present invention, every equalization of doing according to native system changes and all belongs in the interest field that native system contains with modifying.
Claims (4)
1. the electric automobile heat-pump air-conditioning system that variable-frequency motor drives, is characterized in that: comprise variable-frequency motor, compressor, four-way change-over valve, car outdoor heat exchanger fan, car outdoor heat exchanger, the first expansion valve, the first check valve, the second check valve, the 3rd check valve, the 4th check valve, the second expansion valve, the first triple valve, the second triple valve, the 3rd triple valve, the 4th triple valve, car indoor temperature transmitter, car indoor heat exchanger, car indoor heat exchanger fan, control system, gas-liquid separator, car outdoor temperature sensor and pressure sensor;
The belt wheel of variable-frequency motor is connected by polywedge bet with the belt wheel of compressor; The exhaust outlet of compressor connects the entrance of four-way change-over valve, setting pressure sensor in the middle of the two, and the air entry of compressor connects the outlet of gas-liquid separator; Its excess-three mouth of four-way change-over valve is connected with outlet, the outlet of car outdoor heat exchanger and the entrance of gas-liquid separator of car indoor heat exchanger respectively; The entrance of car outdoor heat exchanger is connected with the first triple valve, all the other two mouthfuls of the first triple valve connect respectively the outlet of entrance and first expansion valve of the first check valve, the entrance of the first expansion valve is connected with the outlet of the second check valve, the entrance of the outlet of the first check valve and the second check valve is connected with two mouthfuls of the second triple valve respectively simultaneously; The entrance of car indoor heat exchanger is connected with wherein a bite of the 4th triple valve, all the other two mouthfuls are connected with the outlet of the second expansion valve and the entrance of the 4th check valve respectively, the entrance of the second expansion valve is connected with the outlet of the 3rd check valve, the outlet of the entrance of the 3rd check valve and the 4th check valve is connected with two mouthfuls of the 3rd triple valve respectively, the second triple valve is connected with the 3rd triple valve, forms the circuit system of sealing; Described control system is connected by shielding line with the pressure sensor at car outdoor temperature sensor, car indoor temperature transmitter and exhaust outlet of compressor place, and its output connects respectively variable-frequency motor, four-way change-over valve, car outdoor heat exchanger fan, car indoor heat exchanger fan.
2. the electric automobile heat-pump air-conditioning system that a kind of variable-frequency motor according to claim 1 drives, is characterized in that: described control system comprises data acquisition module and object control module; The signal of data collecting module collected car indoor temperature, car outdoor temperature, Compressor Discharge Pressure, and sent in control system; Control system generates relevant control signal according to the data that gather, control variable-frequency motor, four-way change-over valve,
Car outdoor heat exchanger fan, car indoor heat exchanger fan are worked it under best state.
3. the electric automobile heat-pump air-conditioning system that a kind of variable-frequency motor according to claim 1 drives, is characterized in that: described the first expansion valve, the second expansion valve are inner equilibrium formula expansion valve, respectively reducing pressure by regulating flow, adjust flux in the time heating, freeze.
4. the electric automobile heat-pump air-conditioning system that a kind of variable-frequency motor according to claim 1 drives, is characterized in that: described car outdoor heat exchanger serves as condenser under refrigeration mode, under heating mode, serves as evaporimeter; Described car indoor heat exchanger serves as evaporimeter under refrigeration mode, under heating mode, serves as condenser.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210512903.9A CN102980262B (en) | 2012-12-04 | 2012-12-04 | Electric automobile heat pump air conditioning system driven by variable frequency motor |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201210512903.9A CN102980262B (en) | 2012-12-04 | 2012-12-04 | Electric automobile heat pump air conditioning system driven by variable frequency motor |
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| Publication Number | Publication Date |
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| CN102980262A CN102980262A (en) | 2013-03-20 |
| CN102980262B true CN102980262B (en) | 2014-11-12 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103307709B (en) * | 2013-06-03 | 2015-11-18 | 北京理工大学 | The electric automobile heat-pump air-conditioning system that a kind of refrigerant charge is adjustable |
| US20150165866A1 (en) * | 2013-12-18 | 2015-06-18 | Hyundai Motor Company | Aspirator in-car sensor module for vehicle, installation structure of in-car sensor module and vehicle having the installation structure |
| CN105691147A (en) * | 2016-01-18 | 2016-06-22 | 河北驰特轨道交通设备有限公司 | Heat pump air-conditioning system of blade electric vehicle |
| CN107990581A (en) * | 2017-11-24 | 2018-05-04 | 北京理工大学 | A kind of electric automobile carbon dioxide heat-pump air-conditioning system |
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| CN202092282U (en) * | 2011-06-07 | 2011-12-28 | 山东宝雅新能源汽车股份有限公司 | Air-conditioning control system of electric automobile |
| CN202145036U (en) * | 2011-07-01 | 2012-02-15 | 浙江盾安机械有限公司 | Heat pump type refrigeration and heating air-conditioning system for electric motor car |
| CN102788397A (en) * | 2012-09-05 | 2012-11-21 | 天津三电汽车空调有限公司 | Heat pump air-conditioning system of electric vehicle |
| CN202938438U (en) * | 2012-12-04 | 2013-05-15 | 北京理工大学 | Electric car heat pump air conditioning system driven by variable frequency motor |
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- 2012-12-04 CN CN201210512903.9A patent/CN102980262B/en not_active Expired - Fee Related
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN202092282U (en) * | 2011-06-07 | 2011-12-28 | 山东宝雅新能源汽车股份有限公司 | Air-conditioning control system of electric automobile |
| CN202145036U (en) * | 2011-07-01 | 2012-02-15 | 浙江盾安机械有限公司 | Heat pump type refrigeration and heating air-conditioning system for electric motor car |
| CN102788397A (en) * | 2012-09-05 | 2012-11-21 | 天津三电汽车空调有限公司 | Heat pump air-conditioning system of electric vehicle |
| CN202938438U (en) * | 2012-12-04 | 2013-05-15 | 北京理工大学 | Electric car heat pump air conditioning system driven by variable frequency motor |
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