CN111976419A - Refrigeration method and control system for eliminating temperature disturbance - Google Patents
Refrigeration method and control system for eliminating temperature disturbance Download PDFInfo
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- CN111976419A CN111976419A CN202010640256.4A CN202010640256A CN111976419A CN 111976419 A CN111976419 A CN 111976419A CN 202010640256 A CN202010640256 A CN 202010640256A CN 111976419 A CN111976419 A CN 111976419A
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- 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
- B60H1/00357—Air-conditioning arrangements specially adapted for particular vehicles
- B60H1/00385—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell
- B60H1/00392—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell for electric vehicles having only electric drive means
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- 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
- B60H1/00271—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit
- B60H1/00278—HVAC devices specially adapted for particular vehicle parts or components and being connected to the vehicle HVAC unit for the battery
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- 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
- B60H1/00642—Control systems or circuits; Control members or indication devices for heating, cooling or ventilating devices
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- 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
- B60H1/3204—Cooling devices using compression
- B60H1/3205—Control means therefor
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
- B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
- B60L58/24—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries
- B60L58/26—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries for controlling the temperature of batteries by cooling
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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Abstract
The invention relates to the technical field of refrigeration control, and provides a refrigeration method and a control system for eliminating temperature disturbance.
Description
Technical Field
The invention relates to the technical field of refrigeration control, in particular to a refrigeration method and a control system for eliminating temperature disturbance.
Background
At present, most of electric vehicles only adopt one compressor to refrigerate a battery pack and a passenger compartment at the same time, and control a refrigerant loop through a Chiller (cooler) electromagnetic valve and an Evap (fuel evaporation control) battery valve respectively so as to achieve the purpose of exchanging heat for the battery pack or an evaporator. The control process mainly comprises the following 4 states:
1. when only the passenger compartment sends a refrigeration request, the compressor is controlled to be started, the EVAP electromagnetic valve is opened, the Chiller electromagnetic valve is closed, the battery water pump is closed, and all refrigerants exchange heat through the evaporator;
2. when only the battery pack sends a refrigeration request, the compressor is controlled to be started, the EVAP electromagnetic valve is closed, the Chiller electromagnetic valve is opened, the battery water pump is opened, and all refrigerants are subjected to Chiller heat exchange;
3. when the passenger compartment and the battery pack send out refrigeration requests at the same time, the compressor is controlled to be started, the EVAP electromagnetic valve is opened, the Chiller electromagnetic valve is opened, the battery water pump is opened, so that part of the refrigerant is subjected to Chiller heat exchange, and part of the refrigerant is subjected to evaporator heat exchange;
4. when the passenger cabin and the battery pack have no refrigeration request, the compressor is controlled to be closed, the EVAP electromagnetic valve is opened, the Chiller electromagnetic valve is closed, and the battery water pump is closed.
However, when the system is switched from single-passenger cabin refrigeration to simultaneous refrigeration of the passenger cabin and the battery pack, the pressure of the coolant in the Chiller loop is lower than that in the EVAP loop, so that most of the coolant flows to the Chiller loop instantly, and the coolant flow of the EVAP loop is greatly reduced. And the opening degree of the thermal expansion valve is reduced due to the reduction of the flow rate of the refrigerant in the EVAP circuit, so that the temperature of the evaporator is increased. And when the refrigeration demand is strong in summer, the temperature of the evaporator can not be reduced through the position of the air mixing door, so that the temperature of an air outlet in the automobile rises, and the comfort level of a human body is further influenced.
Disclosure of Invention
The invention provides a refrigeration method and a control system for eliminating temperature disturbance, and solves the technical problems of low refrigeration accuracy and poor refrigeration effect caused by refrigeration intervention of a battery pack in a passenger compartment air conditioner when a passenger compartment and the battery pack are simultaneously refrigerated in the existing new energy automobile.
In order to solve the above technical problems, the present invention provides a refrigeration method for eliminating temperature disturbance, comprising:
when the passenger cabin and the battery pack enter a refrigeration initial stage simultaneously, controlling the electric compressor to work according to a first preset rotating speed, opening the first electromagnetic valve, opening and closing the second electromagnetic valve according to a preset control waveform, and opening the battery water pump;
when the passenger compartment and the battery pack enter a refrigeration stabilization period at the same time, the electric compressor is controlled to work at a second preset rotating speed, the first electromagnetic valve is opened, the second electromagnetic valve is opened, and the battery water pump is opened.
This basic scheme is through the initial stage of refrigeration refrigerated simultaneously at passenger cabin and battery package, control electric compressor, first solenoid valve is respectively with the work of first predetermined rotational speed, it switches on to predetermine the control waveform, lean on the support of first predetermined rotational speed electric compressor and improved refrigeration efficiency, still utilize the break-make of the refrigeration circuit of second solenoid valve developments regulation and control battery package, reduce the refrigerant pressure in passenger cabin, thereby the refrigerated intervention disturbance degree simultaneously of battery package has been reduced effectively, guaranteed the steady transition of high temperature to microthermal in the passenger cabin of refrigeration initial stage (the steady transition of refrigeration initial stage to refrigeration stationary phase), utilize the control valve of on-vehicle system from the area, give the comfortable use of user and experience.
In a further embodiment, the indication when the passenger compartment and the battery pack enter the initial stage of cooling simultaneously is: the passenger cabin and the battery pack send out a refrigeration request at the same time;
the marks when the passenger compartment and the battery pack enter the refrigeration stabilization period simultaneously are as follows: when the second electromagnetic valve is switched to be fully opened, the temperature of the passenger compartment is kept stable.
According to the scheme, the marks of the initial refrigeration stage and the stable refrigeration stage are clearly and clearly set, so that accurate detection of the initial refrigeration stage and the stable refrigeration stage of the passenger compartment and the battery pack is realized, accurate feedback of a refrigeration request is further realized, and accurate and efficient refrigeration control of the passenger compartment and the battery pack is guaranteed.
In further embodiments, the first solenoid valve is an Evap solenoid valve; the second electromagnetic valve is a Chiller electromagnetic valve.
According to the scheme, the independent and accurate control of the passenger cabin and the battery pack is realized by respectively arranging the Evap electromagnetic valve and the Chiller electromagnetic valve corresponding to the passenger cabin and the battery pack.
In a further embodiment, the first preset rotation speed is higher than the second preset rotation speed, and the second preset rotation speed is a normal working rotation speed.
This scheme sets up the first rotational speed of predetermineeing that is higher than normal operating speed, and the rotational speed through improving electric compressor (first rotational speed of predetermineeing) at the refrigeration initial stage has improved the refrigeration efficiency of system to can adapt to the refrigeration demand when passenger cabin, battery package synchronous access (send the refrigeration request simultaneously), realized the battery package and inserted the feedback adjustment to the temperature disturbance that passenger cabin refrigeration produced.
In further embodiments, the preset control waveform is: and alternately opening and closing the second electromagnetic valve, gradually prolonging the opening time of the second electromagnetic valve, and keeping the closing time of the second electromagnetic valve unchanged.
In the refrigeration initial stage of simultaneous refrigeration of the passenger compartment and the battery pack, the second electromagnetic valve is controlled to be opened and closed alternately in order to gradually prolong the classification of the opening time and the closing time, so that the refrigerant pressure of the battery pack side is increased, the refrigerant pressure of the passenger compartment side is reduced, the refrigerant distribution of the passenger compartment and the battery pack is uniform, and the stable transition of the refrigeration process of the passenger compartment is ensured.
In a further embodiment, the electric compressor, the first solenoid valve, and the condenser, the thermostatic expansion valve, and the first evaporator are connected in series to form an evaporation circuit corresponding to the passenger compartment; the first electromagnetic valve is used for controlling the connection or disconnection of the evaporation loop;
the electric compressor, the second electromagnetic valve, the condenser and the second evaporator are connected in series to form a battery pack cooling loop corresponding to the battery pack; the second electromagnetic valve is used for controlling the conduction or the disconnection of the battery pack cooling loop; the battery water pump is used for controlling the heat exchange rate between the battery pack and the battery pack cooling loop.
The electric compressor and the condenser are independently connected with the evaporation loop and the battery pack cooling loop in series, so that the evaporation loop and the battery pack cooling loop are connected in series, synchronous refrigeration of the passenger cabin and the battery pack can be realized by only using one group of refrigeration equipment (the electric compressor and the condenser), the use efficiency of the equipment is greatly improved, and the production cost of products is reduced.
In a further embodiment, when only the passenger compartment sends a refrigeration request, the electric compressor is controlled to work at the second preset rotating speed, and the first electromagnetic valve is opened;
when only the battery pack sends a refrigeration request, the electric compressor is controlled to work according to the second preset rotating speed, the second electromagnetic valve is opened, and the battery water pump is opened.
This scheme sets up the control law when independently sending the refrigeration request corresponding to passenger cabin and battery package respectively, when two sets of equipment (passenger cabin and battery package) independently apply for the refrigeration, through right electric compressor, first solenoid valve, second solenoid valve and battery water pump bind the control, when reducing the refrigeration cost, realized the accurate and effectual control of independently refrigerating passenger cabin and battery package.
The invention also provides a control system for eliminating the temperature disturbance, and the refrigeration method for eliminating the temperature disturbance comprises an air conditioner controller, and an electric compressor, a first electromagnetic valve, a second electromagnetic valve and a battery pack cooling module which are electrically connected with the air conditioner controller; the system also comprises a condenser connected with the electric compressor pipeline, a thermostatic expansion valve and a first evaporator which are connected with the first electromagnetic valve pipeline, and a second evaporator which is connected with the second electromagnetic valve pipeline;
the electric compressor, the condenser, the first electromagnetic valve, the thermostatic expansion valve and the first evaporator which are connected in sequence form an evaporation loop;
the electric compressor, the condenser, the second electromagnetic valve and the second evaporator which are connected in sequence form a battery pack cooling loop;
when the air conditioner controller receives refrigeration requests sent by the passenger cabin and the battery pack at the same time and determines that the passenger cabin and the battery pack both enter the initial refrigeration stage, the air conditioner controller controls the electric compressor to work according to a first preset rotating speed, the first electromagnetic valve is opened, the second electromagnetic valve is opened and closed according to a preset control waveform, and the battery water pump is opened; when the air conditioner controller determines that the air conditioner controller and the air conditioner controller both enter a refrigeration stabilization period, the electric compressor is controlled to work at a second preset rotating speed, the first electromagnetic valve is opened, the second electromagnetic valve is opened, and the battery water pump is opened;
when the air conditioner controller only receives a refrigeration request sent by the passenger cabin, the electric compressor is controlled to work according to the second preset rotating speed, and the first electromagnetic valve is opened;
when the air conditioner controller only receives a refrigeration request sent by the battery pack, the electric compressor is controlled to work according to the second preset rotating speed, the second electromagnetic valve is opened, and the battery water pump is opened.
The basic scheme is that a group of common refrigeration equipment (an electric compressor and a condenser), a first electromagnetic valve, a thermal expansion valve and a first evaporator which are connected in series with the common refrigeration equipment to form an evaporation loop, a second electromagnetic valve, a second evaporator which are connected in series with the common refrigeration equipment to form a battery pack cooling loop, and an air conditioner controller jointly form a temperature control mechanism, in the initial refrigeration stage of simultaneous refrigeration of a passenger compartment and a battery pack, the electric compressor and the first electromagnetic valve are controlled by the air conditioner controller to respectively work at a first preset rotating speed and conduct in a preset control waveform, the support of the electric compressor at the first preset rotating speed improves the refrigeration efficiency, the on-off of the refrigeration loop of the battery pack is dynamically regulated and controlled by the second electromagnetic valve, the refrigerant pressure of the passenger compartment is reduced, the intervention disturbance degree of simultaneous refrigeration of the battery pack is effectively reduced, the stable transition from high temperature to low temperature in the passenger compartment in the initial refrigeration stage (the stable transition from the initial refrigeration stage to the, the control valve of the vehicle-mounted system is utilized to give comfortable use experience to a user.
In further embodiments, the preset control waveform is: alternately opening and closing the second electromagnetic valve, gradually prolonging the opening time of the second electromagnetic valve, and keeping the closing time of the second electromagnetic valve unchanged;
in the refrigeration initial stage of simultaneous refrigeration of the passenger compartment and the battery pack, the second electromagnetic valve is controlled to be opened and closed alternately in order to gradually prolong the classification of the opening time and the closing time, so that the refrigerant pressure of the battery pack side is increased, the refrigerant pressure of the passenger compartment side is reduced, the refrigerant distribution of the passenger compartment and the battery pack is uniform, and the stable transition of the refrigeration process of the passenger compartment is ensured.
The first preset rotating speed is higher than the second preset rotating speed, and the second preset rotating speed is a normal working rotating speed;
the first electromagnetic valve is an Evap electromagnetic valve; the second electromagnetic valve is a Chiller electromagnetic valve.
This scheme sets up the first rotational speed of predetermineeing that is higher than normal operating speed, utilizes the rotational speed through improving electric compressor (first rotational speed of predetermineeing) at the refrigeration initial stage, has improved the refrigeration efficiency of system to can adapt to the passenger cabin fast, the refrigeration demand when battery package synchronous access (send the refrigeration request simultaneously), realized the battery package and inserted the feedback adjustment to the temperature disturbance that passenger cabin refrigeration produced.
In a further embodiment, the battery pack cooling module comprises a cooling pipeline and a temperature sensor which are tightly attached to the battery pack, and a battery water pump for controlling the flow speed of cooling liquid in the cooling pipeline; and when a refrigeration request of the battery pack is received, the air conditioner controller starts the battery water pump to control the cooling liquid to exchange heat with the second evaporator.
The cooling pipeline and the temperature sensor which are tightly attached to the battery pack are arranged, so that the heat conduction efficiency and the temperature feedback rate of the battery pack are improved, the temperature of the battery pack can be accurately detected in real time, and an alarm can be given in time when the temperature of the battery pack is abnormal; the battery water pump is arranged on the cooling pipeline and electrically connected with the air conditioner controller, the water flow speed in the cooling pipeline is controlled by the battery water pump, and the remote control of the air conditioner controller on the refrigeration (cooling) of the battery pack is realized.
Drawings
FIG. 1 is a flow chart of the operation of a cooling method for eliminating temperature disturbance provided in embodiment 1 of the present invention;
fig. 2 is a schematic diagram of a pulse waveform of the preset control waveform in fig. 1 according to embodiment 1 of the present invention;
fig. 3 is an electrical connection structure diagram of a part of devices of a control system for eliminating temperature disturbance according to embodiment 2 of the present invention;
fig. 4 is a structural diagram of a mechanical connection of a part of devices of a control system for eliminating temperature disturbance provided in embodiment 2 of the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the accompanying drawings, which are given solely for the purpose of illustration and are not to be construed as limitations of the invention, including the drawings which are incorporated herein by reference and for illustration only and are not to be construed as limitations of the invention, since many variations thereof are possible without departing from the spirit and scope of the invention.
Example 1
As shown in fig. 1, the refrigeration method for eliminating temperature disturbance according to the embodiment of the present invention includes the steps of:
when the passenger cabin and the battery pack enter a refrigeration initial stage simultaneously, controlling the electric compressor to work according to a first preset rotating speed, opening the first electromagnetic valve, opening and closing the second electromagnetic valve according to a preset control waveform, and opening the battery water pump;
when the passenger cabin and the battery pack enter a refrigeration stabilization period simultaneously, the electric compressor is controlled to work according to a second preset rotating speed, the first electromagnetic valve is opened, the second electromagnetic valve is opened, and the battery water pump is opened.
This embodiment is through the initial stage of refrigeration refrigerated simultaneously at passenger cabin and battery package, control electric compressor, first solenoid valve is respectively with the work of first predetermined rotational speed, it switches on to predetermine the control waveform, rely on the support of first predetermined rotational speed electric compressor to improve refrigeration efficiency, still utilize the break-make of the refrigeration circuit of second solenoid valve developments regulation and control battery package, reduce refrigerant (refrigerant) pressure in passenger cabin, thereby the refrigerated intervention disturbance degree simultaneously of battery package has been reduced effectively, the smooth transition (the smooth transition of the initial stage of refrigeration to the refrigeration stationary phase) of high temperature to microthermal in the passenger cabin of refrigeration initial stage has been guaranteed, utilize the control valve of on-vehicle system from the area, give the comfortable use of user and experience.
In this embodiment, the flags when the passenger compartment and the battery pack enter the initial stage of cooling at the same time are: the passenger cabin and the battery pack send out a refrigeration request at the same time;
when the passenger compartment and the battery pack enter the refrigeration stabilization period at the same time, the marks are as follows: when the second electromagnetic valve is switched to be fully opened, the temperature of the passenger compartment is kept stable;
the end of the cooling stabilization period is marked by: the battery pack or the passenger compartment does not need to be refrigerated, and a refrigeration ending request is sent out.
In the embodiment, the marks of the initial refrigeration stage and the stable refrigeration stage are clearly and clearly set, so that accurate detection of the initial refrigeration stage and the stable refrigeration stage of the passenger compartment and the battery pack is realized, accurate feedback of a refrigeration request is further realized, and accurate and efficient refrigeration control of the passenger compartment and the battery pack is ensured.
In this embodiment, the first solenoid valve is an Evap solenoid valve; the second solenoid valve is a Chiller solenoid valve.
The vehicle-mounted EVAP system (fuel evaporation control system) is composed of a fuel tank, an activated carbon canister and a carbon canister control electromagnetic valve and is used for controlling the evaporation of vehicle-mounted fuel, and the Evap electromagnetic valve mentioned in the embodiment is the carbon canister control electromagnetic valve.
The battery cooler (Chiller) is mainly composed of a heat exchanger (equivalent to the second evaporator hereinafter), an expansion valve (TXV) with solenoid valves, a pipe connection and a bracket. The heat exchanger is mainly used for heat exchange between power battery cooling liquid and refrigerant of a refrigeration system, and heat in the power battery cooling liquid is transferred to the refrigerant. The cell valve is a beller cell valve mentioned in this embodiment.
In the embodiment, the independent and precise control of the passenger cabin and the battery pack is realized by respectively arranging the Evap electromagnetic valve and the Chiller electromagnetic valve corresponding to the passenger cabin and the battery pack.
In this embodiment, the first preset rotation speed is higher than the second preset rotation speed, and the second preset rotation speed is the normal operation rotation speed.
The first preset rotating speed higher than the normal working rotating speed is set in the embodiment, and the rotating speed of the electric compressor (the first preset rotating speed) is increased at the initial stage of refrigeration, so that the refrigeration efficiency of the system is improved, the refrigeration requirement when the passenger compartment and the battery pack are synchronously accessed (the refrigeration requirement is sent out simultaneously) can be quickly adapted, and the feedback adjustment of the temperature disturbance generated by the refrigeration of the passenger compartment by the battery pack access is realized.
Referring to fig. 2, in the present embodiment, the preset control waveform is: and alternately opening and closing the second electromagnetic valve, gradually prolonging the opening time of the second electromagnetic valve, and keeping the closing time of the second electromagnetic valve unchanged.
In the embodiment, the second battery valve is controlled to be opened and closed alternately by the pulse waveform, and the increasing amplitude and the closing time of the opening time can be set according to the actual refrigeration requirement, for example, when a user pursues stable refrigeration (temperature smooth transition), the duty ratio of the closing time can be slightly increased at the initial stage of refrigeration, for example, the closing time can be set to be 3 seconds, the initial value of the opening time is 1 second, and the increasing amplitude is 1 second. When a user pursues rapid cooling, the duty ratio of the off time may be slightly reduced at the initial stage of cooling, for example, the off time may be set to 3 seconds, the initial value of the on time is 2 seconds, and the increment is 1.5 seconds. A plurality of gears can be set according to the requirements of stable refrigeration and quick refrigeration, and the proportion of closing time and the increasing amplitude of opening time at the initial refrigeration stage are preset, so that a user can directly control refrigeration.
The abscissa in fig. 2 represents time, and the ordinate represents the current pulse signal value, which is divided into 1 and 0. Wherein a pulse signal value of 1 indicates that an open signal is given to the second battery valve (opening the second battery valve), and a pulse signal value of 0 indicates that a close signal is given to the second battery valve (closing the second battery valve).
In the embodiment, at the initial stage of refrigeration when the passenger compartment and the battery pack are refrigerated simultaneously, the second electromagnetic valve is controlled to gradually prolong the opening time and the closing time, and the classification is alternately opened and closed, so that the refrigerant pressure on the side of the battery pack is increased, the refrigerant pressure on the side of the passenger compartment is reduced, the refrigerant distribution of the passenger compartment and the battery pack is uniform, and the stable transition of the refrigerating process of the passenger compartment is ensured.
Referring to fig. 4, in the present embodiment, the electric compressor, the first solenoid valve, the condenser, the thermostatic expansion valve, and the first evaporator are connected in series to form an evaporation circuit corresponding to the passenger compartment; the first electromagnetic valve is used for controlling the connection or disconnection of the evaporation loop;
the thermostatic expansion valve is internally provided with a temperature sensing bulb for detecting the temperature change of the outlet of the first evaporator, and then the cooling efficiency of the passenger compartment is controlled by adjusting the flow of the refrigerant.
The electric compressor, the second electromagnetic valve, the condenser and the second evaporator are connected in series to form a battery pack cooling loop corresponding to the battery pack; the second electromagnetic valve is used for controlling the conduction or the disconnection of the battery pack cooling loop; the battery water pump is used for controlling the heat exchange rate between the battery pack and the battery pack cooling loop.
The battery water pump is used for controlling the flow speed of cooling liquid in the cooling pipeline tightly attached to the battery pack.
In the embodiment, the electric compressor and the condenser are independently connected in series with the evaporation loop and the battery pack cooling loop, so that the evaporation loop and the battery pack cooling loop are connected in series, and further, the passenger compartment and the battery pack can be synchronously refrigerated by only using one group of refrigeration equipment (the electric compressor and the condenser), the service efficiency of the equipment is greatly improved, and the production cost of products is reduced.
In the embodiment, when only the passenger compartment sends a refrigerating request, the electric compressor is controlled to work at a second preset rotating speed, and the first electromagnetic valve is opened;
when only the battery pack sends a refrigeration request, the electric compressor is controlled to work according to a second preset rotating speed, the second electromagnetic valve is opened, and the battery water pump is opened.
This embodiment sets up the control law when independently sending the refrigeration request corresponding to passenger cabin and battery package respectively, when two sets of equipment (passenger cabin and battery package) independently apply for the refrigeration, through the control of binding to electric compressor, first solenoid valve, second solenoid valve and battery water pump, when reducing the refrigeration cost, has realized the accurate and effectual control of independently refrigerating passenger cabin and battery package.
The specific working process of the refrigeration method in this embodiment is as follows:
when the passenger compartment and the battery pack enter the initial stage of refrigeration at the same time, the electric compressor is controlled to work according to a first preset rotating speed (the rotating speed of the electric compressor is increased on the basis of the normal rotating speed, the air displacement is increased by increasing the compression ratio in unit time, and then the circulation of a refrigerant is accelerated), a refrigerant is compressed into high-temperature and high-pressure gas and is transmitted to a condenser, and low-temperature and high-pressure liquid is obtained through heat dissipation. At the moment, the first electromagnetic valve is opened, the second electromagnetic valve is opened and closed according to a preset control waveform, and the battery water pump is opened. When the second electromagnetic valve is closed, the medium-temperature high-pressure liquid is transmitted to the evaporation loop, is throttled and depressurized by the thermostatic expansion valve to become low-pressure liquid, and finally reaches the first evaporator to be evaporated and absorb heat, so that the temperature of the passenger compartment is reduced.
When the second electromagnetic valve is opened, the medium-temperature high-pressure liquid is shunted to the evaporation loop and the battery pack cooling loop, and is evaporated and absorbs heat in the first evaporator (the cooling process of the passenger compartment is the same as the above) and the second evaporator respectively, so that the temperature of the passenger compartment and the temperature of the battery pack are reduced. When the medium-temperature high-pressure liquid is transmitted to the battery pack cooling loop, the battery water pump controls the flow of the cooling liquid in the cooling pipeline to perform thermal interaction with the medium-temperature high-pressure liquid, so that the temperature of the battery pack is reduced;
when the second electromagnetic valve is switched to be fully opened and the temperature of the passenger compartment is still stable, and the passenger compartment and the battery pack are judged to simultaneously enter a refrigeration stabilization period, the electric compressor is controlled to work at a second preset rotating speed (normal rotating speed), the first electromagnetic valve is opened, the second electromagnetic valve is opened, and the battery water pump is opened; at the moment, the temperature of the passenger compartment tends to be stable, the condenser respectively conveys stable and continuous low-temperature high-pressure liquid to the evaporation loop and the battery pack cooling loop, and the temperature disturbance of refrigerant shunting of the battery pack cooling loop on the passenger compartment is basically negligible.
Example 2
The reference numbers in the drawings in the present embodiment include: the system comprises an air conditioner controller 1, an electric compressor 2, a first electromagnetic valve 3, a second electromagnetic valve 4, a battery pack cooling module 5, a cooling pipeline 51, a temperature sensor 52, a battery water pump 53, a condenser 6, a thermal expansion valve 7, a first evaporator 8 and a second evaporator 9.
Referring to fig. 3 and 4, an embodiment of the present invention further provides a control system for eliminating temperature disturbance, and the refrigeration method for eliminating temperature disturbance of embodiment 1 is operated, where the refrigeration method includes an air conditioner controller 1, and an electric compressor 2, a first electromagnetic valve 3, a second electromagnetic valve 4, and a battery pack cooling module 5 electrically connected to the air conditioner controller; the system also comprises a condenser 6 connected with the electric compressor 2 through a pipeline, a thermostatic expansion valve 7 and a first evaporator 8 which are connected with the first electromagnetic valve 3 through a pipeline, and a second evaporator 9 connected with the second electromagnetic valve 4 through a pipeline;
wherein the thick connecting lines in figure 4 represent the flow ducts of the refrigerant fluid.
The electric compressor 2, the condenser 6, the first electromagnetic valve 3, the thermostatic expansion valve 7 and the first evaporator 8 which are connected in sequence form an evaporation loop;
the electric compressor 2, the condenser 6, the second electromagnetic valve 4 and the second evaporator 9 which are connected in sequence form a battery pack cooling loop;
the thermostatic expansion valve 7 is internally provided with a temperature sensing bulb for detecting the temperature change at the outlet of the first evaporator 8, and then the cooling efficiency of the passenger compartment is controlled by adjusting the flow of the refrigerant (refrigerant).
A liquid reservoir (a liquid storage tank/a drying bottle) is further provided behind the condenser 6 for filtering and drying a refrigerant, which circulates through a pipe connecting the respective parts.
When the air conditioner controller 1 receives refrigeration requests sent by the passenger compartment and the battery pack at the same time and determines that the passenger compartment and the battery pack both enter the initial refrigeration stage, the air conditioner controller 1 controls the electric compressor 2 to work according to a first preset rotating speed, the first electromagnetic valve 3 is opened, the second electromagnetic valve 4 is opened and closed according to a preset control waveform, and the battery water pump 53 is opened; when the air conditioner controller 1 determines that the air conditioner controller and the air conditioner controller both enter a refrigeration stabilization period, the electric compressor 2 is controlled to work according to a second preset rotating speed, the first electromagnetic valve 3 is opened, the second electromagnetic valve 4 is opened, and the battery water pump 53 is opened;
when the air conditioner controller 1 only receives a refrigeration request sent by a passenger compartment, the electric compressor 2 is controlled to work according to a second preset rotating speed, and the first electromagnetic valve 3 is opened;
when the air conditioner controller 1 only receives a refrigeration request sent by the battery pack, the electric compressor 2 is controlled to work according to a second preset rotating speed, the second electromagnetic valve 4 is opened, and the battery water pump 53 is opened.
In the embodiment, a group of common refrigeration equipment (an electric compressor 2 and a condenser 6), a first electromagnetic valve 3, a thermal expansion valve 7 and a first evaporator 8 which are connected in series with the common refrigeration equipment to form an evaporation loop, a second electromagnetic valve 4, a second evaporator 9 which are connected in series with the common refrigeration equipment to form a battery pack cooling loop, and an air-conditioning controller 1 jointly form a temperature control mechanism, in the initial refrigeration stage of simultaneous refrigeration of a passenger compartment and a battery pack, the air-conditioning controller 1 controls the electric compressor 2 and the first electromagnetic valve 3 to respectively work at a first preset rotating speed and conduct in a preset control waveform, the refrigeration efficiency is improved by depending on the support of the first preset rotating speed electric compressor 2, the second electromagnetic valve 4 is also used for dynamically regulating and controlling the on-off of the refrigeration loop of the battery pack, the refrigerant pressure of the passenger compartment is reduced, and the disturbance degree of simultaneous refrigeration of the battery pack is effectively reduced, the stable transition from high temperature to low temperature in the passenger cabin at the initial stage of refrigeration (the stable transition from the initial stage of refrigeration to the stable period of refrigeration) is ensured, and the comfortable use experience is given to a user by utilizing the control valve of the vehicle-mounted system.
Referring to fig. 2, in the present embodiment, the preset control waveform is: the second electromagnetic valve 4 is alternately opened and closed, and the opening period of the second electromagnetic valve 4 is gradually extended, but the closing period of the second electromagnetic valve 4 is kept unchanged.
In this embodiment, the air conditioner controller 1 outputs a pulse waveform to the second battery valve to control the second battery valve to open and close alternately, and the increase amplitude of the opening time and the closing time can be set according to the actual refrigeration requirement. For example, when the user pursues stable cooling (temperature smooth transition), the duty ratio of the off time may be slightly increased at the beginning of cooling, for example, the off time may be set to 3 seconds, the on time may be set to 1 second at the initial value, and the increment may be set to 1 second. When a user pursues rapid cooling, the duty ratio of the off time may be slightly reduced at the initial stage of cooling, for example, the off time may be set to 3 seconds, the initial value of the on time is 2 seconds, and the increment is 1.5 seconds. A plurality of gears can be set according to the requirements of stable refrigeration and quick refrigeration, and the proportion of closing time and the increasing amplitude of opening time at the initial refrigeration stage are preset, so that a user can directly control refrigeration.
The abscissa in fig. 2 represents time, the ordinate represents the current pulse signal value, the pulse signal value is divided into 1 and 0, a pulse signal value of 1 represents that the air conditioner controller 1 gives an opening signal to the second battery valve (opens the second battery valve), and a pulse signal value of 0 represents that the air conditioner controller 1 gives a closing signal to the second battery valve (closes the second battery valve).
In the initial stage of refrigeration in which the passenger compartment and the battery pack are simultaneously refrigerated, the second electromagnetic valve 4 is controlled to gradually prolong the time for opening and the time for keeping closing, and the classification is alternately opened and closed, so that the refrigerant pressure on the side of the battery pack is increased, the refrigerant pressure on the side of the passenger compartment is reduced, the refrigerant distribution of the passenger compartment and the refrigerant of the battery pack is uniform, and the stable transition of the refrigerating process of the passenger compartment is ensured.
The first preset rotating speed is higher than the second preset rotating speed, and the second preset rotating speed is the normal working rotating speed;
the first electromagnetic valve 3 is an Evap electromagnetic valve; the second solenoid valve 4 is a belleville solenoid valve.
The vehicle-mounted EVAP system (fuel evaporation control system) is composed of a fuel tank, an activated carbon canister and a carbon canister control electromagnetic valve and is used for controlling the evaporation of vehicle-mounted fuel, and the Evap electromagnetic valve mentioned in the embodiment is the carbon canister control electromagnetic valve.
The battery cooler (Chiller) is mainly composed of a heat exchanger, an expansion valve (TXV) with a solenoid valve, a pipeline interface and a bracket. The heat exchanger is mainly used for heat exchange between power battery cooling liquid and refrigerant of a refrigeration system, and heat in the power battery cooling liquid is transferred to the refrigerant. The cell valve is a beller cell valve mentioned in this embodiment.
The first preset rotating speed higher than the normal working rotating speed is set in the embodiment, the refrigerating efficiency of the system is improved by utilizing the rotating speed of the electric compressor 2 (the first preset rotating speed) at the initial stage of refrigeration, so that the refrigerating demand when the passenger compartment and the battery pack are synchronously accessed (the refrigerating demand is sent out simultaneously) can be quickly adapted, and the feedback adjustment of the temperature disturbance generated by the refrigeration of the passenger compartment by the battery pack access is realized.
In the present embodiment, the battery pack cooling module 5 includes a cooling pipe 51 and a temperature sensor 52 closely attached to the battery pack, and a battery water pump 53 for controlling the flow rate of the cooling liquid in the cooling pipe 51; when receiving a cooling request of the battery pack, the air conditioning controller 1 starts the battery water pump 53 to control the heat exchange between the coolant and the second evaporator 9.
In the embodiment, the cooling pipeline 51 and the temperature sensor 52 tightly attached to the battery pack are arranged to improve the heat conduction efficiency and the temperature feedback rate of the battery pack, so that the temperature of the battery pack can be accurately detected in real time, and an alarm can be given in time when the temperature of the battery pack is abnormal; the battery water pump 53 electrically connected with the air conditioner controller 1 is arranged on the cooling pipeline 51, and the battery water pump 53 is used for controlling the water flow speed in the cooling pipeline 51, so that the remote control of the air conditioner controller 1 on the refrigeration (cooling) of the battery pack is realized.
The working process of the control system in this embodiment is as follows:
when the air conditioner controller 1 receives refrigeration requests sent by the passenger compartment and the battery pack at the same time and determines that both the passenger compartment and the battery pack enter the initial refrigeration stage, the electric compressor 2 is controlled to work at a first preset rotating speed (the rotating speed of the electric compressor 2 is increased on the basis of the normal rotating speed, the air displacement is increased by increasing the compression ratio in unit time, the circulation of a refrigerant is accelerated, a refrigerant (low-temperature and low-pressure gas) is compressed into high-temperature and high-pressure gas and is transmitted to the condenser 6, and medium-temperature and high-pressure liquid is obtained through heat dissipation. At this time, the air conditioner controller 1 controls the first electromagnetic valve 3 to be opened, the second electromagnetic valve 4 to be opened and closed according to a preset control waveform, and the battery water pump 53 to be opened. When the second electromagnetic valve 4 is closed, the low-temperature high-pressure liquid is transmitted to the evaporation loop, throttled and depressurized by the thermostatic expansion valve 7 to become low-pressure liquid, and finally reaches the first evaporator 8 to be evaporated and absorb heat, so that the temperature of the passenger compartment is reduced.
When the second electromagnetic valve 4 is opened, the medium-temperature high-pressure liquid is shunted to the evaporation circuit and the battery pack cooling circuit, and is evaporated and absorbs heat in the first evaporator 8 (the cooling process of the passenger compartment is the same as above) and the second evaporator 9, respectively, so that the temperatures of the passenger compartment and the battery pack are reduced. When the medium-temperature high-pressure liquid is transmitted to the battery pack cooling loop, the battery water pump 53 controls the flow of the cooling liquid in the cooling pipeline 51 to perform thermal interaction with the medium-temperature high-pressure liquid, so that the temperature of the battery pack is reduced;
when the air conditioner controller 1 detects that the second electromagnetic valve 4 is switched to full open and the temperature of the passenger compartment is still stable, and the passenger compartment and the battery pack are judged to enter a refrigeration stabilization period at the same time, the electric compressor 2 is controlled to work at a second preset rotating speed (normal rotating speed), the first electromagnetic valve 3 is opened, the second electromagnetic valve 4 is opened, and the battery water pump 53 is opened; at this time, the temperature of the passenger compartment tends to be stable, the condenser 6 respectively conveys stable and continuous low-temperature high-pressure liquid to the evaporation circuit and the battery pack cooling circuit, and the temperature disturbance of the refrigerant shunt of the battery pack cooling circuit to the passenger compartment is basically negligible.
The air conditioner controller 1 determines whether the battery pack enters the initial stage of cooling according to the temperature of the battery pack fed back by the temperature sensor 52, adjusts the battery water pump 53 according to a specific temperature value, and further controls the flow rate of the cooling liquid in the cooling pipeline 51.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (10)
1. A refrigeration method for eliminating temperature disturbances, comprising:
when the passenger cabin and the battery pack enter a refrigeration initial stage simultaneously, controlling the electric compressor to work according to a first preset rotating speed, opening the first electromagnetic valve, opening and closing the second electromagnetic valve according to a preset control waveform, and opening the battery water pump;
when the passenger compartment and the battery pack enter a refrigeration stabilization period at the same time, the electric compressor is controlled to work at a second preset rotating speed, the first electromagnetic valve is opened, the second electromagnetic valve is opened, and the battery water pump is opened.
2. A method of cooling with temperature disturbance rejection as claimed in claim 1,
the marks when the passenger compartment and the battery pack enter the initial refrigeration stage at the same time are as follows: the passenger cabin and the battery pack send out a refrigeration request at the same time;
the marks when the passenger compartment and the battery pack enter the refrigeration stabilization period simultaneously are as follows: when the second electromagnetic valve is switched to be fully opened, the temperature of the passenger compartment is kept stable.
3. A refrigeration method for eliminating temperature disturbances as recited in claim 1 wherein: the first electromagnetic valve is an Evap electromagnetic valve; the second electromagnetic valve is a Chiller electromagnetic valve.
4. A refrigeration method for eliminating temperature disturbances as recited in claim 1 wherein: the first preset rotating speed is higher than the second preset rotating speed, and the second preset rotating speed is a normal working rotating speed.
5. A refrigeration method for eliminating temperature disturbance according to claim 1, wherein the preset control waveform is: and alternately opening and closing the second electromagnetic valve, gradually prolonging the opening time of the second electromagnetic valve, and keeping the closing time of the second electromagnetic valve unchanged.
6. A refrigeration method for eliminating temperature disturbances as recited in claim 1 wherein:
the electric compressor, the first electromagnetic valve, the condenser, the thermostatic expansion valve and the first evaporator are connected in series to form an evaporation loop corresponding to the passenger compartment; the first electromagnetic valve is used for controlling the connection or disconnection of the evaporation loop;
the electric compressor, the second electromagnetic valve, the condenser and the second evaporator are connected in series to form a battery pack cooling loop corresponding to the battery pack; the second electromagnetic valve is used for controlling the conduction or the disconnection of the battery pack cooling loop; the battery water pump is used for controlling the heat exchange rate between the battery pack and the battery pack cooling loop.
7. A refrigeration method for eliminating temperature disturbances as recited in claim 2 further comprising:
when only the passenger cabin sends a refrigerating request, the electric compressor is controlled to work according to the second preset rotating speed, and the first electromagnetic valve is opened;
when only the battery pack sends a refrigeration request, the electric compressor is controlled to work according to the second preset rotating speed, the second electromagnetic valve is opened, and the battery water pump is opened.
8. A control system for canceling temperature disturbances, comprising: the air conditioner comprises an air conditioner controller, and an electric compressor, a first electromagnetic valve, a second electromagnetic valve and a battery pack cooling module which are electrically connected with the air conditioner controller; the system also comprises a condenser connected with the electric compressor pipeline, a thermostatic expansion valve and a first evaporator which are connected with the first electromagnetic valve pipeline, and a second evaporator which is connected with the second electromagnetic valve pipeline;
the electric compressor, the condenser, the first electromagnetic valve, the thermostatic expansion valve and the first evaporator which are connected in sequence form an evaporation loop;
the electric compressor, the condenser, the second electromagnetic valve and the second evaporator which are connected in sequence form a battery pack cooling loop;
when the air conditioner controller receives refrigeration requests sent by the passenger cabin and the battery pack at the same time and determines that the passenger cabin and the battery pack both enter the initial refrigeration stage, the air conditioner controller controls the electric compressor to work according to a first preset rotating speed, the first electromagnetic valve is opened, the second electromagnetic valve is opened and closed according to a preset control waveform, and the battery water pump is opened; when the air conditioner controller determines that the air conditioner controller and the air conditioner controller both enter a refrigeration stabilization period, the electric compressor is controlled to work at a second preset rotating speed, the first electromagnetic valve is opened, the second electromagnetic valve is opened, and the battery water pump is opened;
when the air conditioner controller only receives a refrigeration request sent by the passenger cabin, the electric compressor is controlled to work according to the second preset rotating speed, and the first electromagnetic valve is opened;
when the air conditioner controller only receives a refrigeration request sent by the battery pack, the electric compressor is controlled to work according to the second preset rotating speed, the second electromagnetic valve is opened, and the battery water pump is opened.
9. A control system for canceling temperature disturbances according to claim 8 wherein:
the preset control waveform is as follows: alternately opening and closing the second electromagnetic valve, gradually prolonging the opening time of the second electromagnetic valve, and keeping the closing time of the second electromagnetic valve unchanged;
the first preset rotating speed is higher than the second preset rotating speed, and the second preset rotating speed is a normal working rotating speed;
the first electromagnetic valve is an Evap electromagnetic valve; the second electromagnetic valve is a Chiller electromagnetic valve.
10. A control system for canceling temperature disturbances according to claim 8 wherein: the battery pack cooling module comprises a cooling pipeline and a temperature sensor which are tightly attached to the battery pack, and a battery water pump which is used for controlling the flowing speed of cooling liquid in the cooling pipeline; and when a refrigeration request of the battery pack is received, the air conditioner controller starts the battery water pump to control the cooling liquid to exchange heat with the second evaporator.
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