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CN109278497B - Electric automobile thermal management system and control method and device thereof - Google Patents

Electric automobile thermal management system and control method and device thereof Download PDF

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Publication number
CN109278497B
CN109278497B CN201811278741.0A CN201811278741A CN109278497B CN 109278497 B CN109278497 B CN 109278497B CN 201811278741 A CN201811278741 A CN 201811278741A CN 109278497 B CN109278497 B CN 109278497B
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CN
China
Prior art keywords
temperature
loop
controller
battery
liquid pump
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Application number
CN201811278741.0A
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Chinese (zh)
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CN109278497A (en
Inventor
李壮哲
王敏
郭洪江
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Guangzhou Xiaopeng Motors Technology Co Ltd
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Guangzhou Xiaopeng Motors Technology Co Ltd
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Priority to CN201811278741.0A priority Critical patent/CN109278497B/en
Publication of CN109278497A publication Critical patent/CN109278497A/en
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Classifications

    • 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
    • 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
    • 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
    • B60H1/00814—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation
    • B60H1/00878—Control systems or circuits characterised by their output, for controlling particular components of the heating, cooling or ventilating installation the components being temperature regulating devices
    • B60H1/00899—Controlling the flow of liquid in a heat pump system
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
    • B60K11/00—Arrangement in connection with cooling of propulsion units
    • B60K11/02—Arrangement in connection with cooling of propulsion units with liquid cooling
    • 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
    • B60H2001/00307—Component temperature regulation using a liquid flow
    • 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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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Transportation (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Electric Propulsion And Braking For Vehicles (AREA)

Abstract

The invention discloses an electric automobile heat management system and a control method and a control device thereof, wherein the system comprises a motor loop, a battery loop, an air conditioner cooling loop, a four-way valve and a controller, and the control method comprises the following steps: acquiring the temperature of cooling liquid of a motor loop through a first temperature sensor as a first temperature; acquiring the temperature of the cooling liquid of the battery loop as a second temperature through a second temperature sensor; acquiring the temperature of the battery core of the BMS in the battery loop as a third temperature through a third temperature sensor; when the controller detects that the motor loop breaks down or the battery loop breaks down, the four-way valve is controlled by the controller to be communicated with the motor loop and the battery loop according to the first temperature, the second temperature and the third temperature. According to the invention, when one of the motor loop and the battery loop fails, the other loop is communicated through the four-way valve to replace work, so that the loop of the thermal management system is protected, and the service life of the vehicle is prolonged. The invention can be widely applied to the field of new energy automobiles.

Description

Electric automobile thermal management system and control method and device thereof
Technical Field
The invention relates to the field of new energy automobiles, in particular to an electric automobile thermal management system and a control method and device thereof.
Background
Compared with the traditional automobile, the new energy automobile has the whole automobile structure without an engine and a gearbox. Therefore, the thermal management architecture of the whole vehicle is greatly changed and replaced by the thermal management of an electric control system, a motor and a battery. In the driving process of the new energy vehicle, the heat pipe of the whole vehicle plays a great role, and more severe requirements are provided for the heat dissipation capacity, the heating capacity, the energy consumption and the like of the motor loop and the battery loop.
In the use process of the vehicle, when a liquid pump (such as a water pump and the like) in the thermal management control loop fails and cannot work, the vehicle cannot radiate heat, the risk of overtemperature of each element can occur, the use of the vehicle can be seriously influenced, and the performance of the vehicle is limited. When serious, even serious phenomena such as motor overtemperature, battery overtemperature and the like are likely to occur, damage is caused to the control element, and the service life of the vehicle is shortened.
Disclosure of Invention
In order to solve the technical problems, the invention aims to: the electric automobile thermal management system with long service life and the control method and the device thereof are provided.
The technical scheme adopted by one aspect of the invention is as follows:
The utility model provides an electric automobile thermal management system, includes motor circuit, battery circuit, air conditioner cooling circuit, cross valve and controller, the motor circuit includes first liquid supply device, first liquid pump, motor controller, motor, machine that charges, first temperature sensor, radiator and first heat exchanger, the battery circuit includes second liquid supply device, BMS, second temperature sensor, heater, second liquid pump and second heat exchanger, the output of first liquid supply device passes through the cross valve and then is connected with the input of first liquid pump, the output of first liquid pump loops through motor controller, motor, machine that charges, first temperature sensor, radiator and first heat exchanger and then is connected with the input of first liquid supply device, the output of BMS passes through the cross valve and then is connected with the input of second temperature sensor, the output of second temperature sensor loops through heater, second liquid pump, second heat exchanger and second liquid supply device and then is connected with the input of BMS, first heat exchanger and second heat exchanger still pass through the cross valve and then are connected with the input of BMS, first heat exchanger and second heat exchanger, temperature controller, second heat exchanger, temperature sensor and heat exchanger.
Further, the air conditioner cooling loop comprises a diverter, a first stop valve, an air conditioner compressor and a second stop valve, wherein the input end of the diverter is connected with the output end of the air conditioner compressor, the first output end of the diverter sequentially passes through the first stop valve and the first heat exchanger and is further connected with the first input end of the air conditioner compressor, the second output end of the diverter sequentially passes through the second stop valve and the second heat exchanger and is further connected with the second input end of the air conditioner compressor, and the controller is respectively connected with the first stop valve, the air conditioner compressor and the second stop valve.
Further, still include main relay, first relay, second relay and third relay, the input of main relay is connected with the output of controller, air condition compressor, heater, motor controller, BMS, machine that charges, first relay, second relay and third relay are connected respectively to the output of main relay, the input of first liquid pump is connected to the output of first relay, the input of second liquid pump is connected to the output of second relay, the input of radiator is connected to the output of third relay.
Further, a third temperature sensor is further included, and the third temperature sensor is respectively connected with the battery cells of the BMS and the controller.
The technical scheme adopted by the other aspect of the invention is as follows:
a control method of an electric automobile thermal management system comprises the following steps:
acquiring the temperature of cooling liquid of a motor loop through a first temperature sensor as a first temperature;
acquiring the temperature of the cooling liquid of the battery loop as a second temperature through a second temperature sensor;
acquiring the temperature of the battery core of the BMS in the battery loop as a third temperature through a third temperature sensor;
When the controller detects that the motor loop breaks down or the battery loop breaks down, the four-way valve is controlled by the controller to be communicated with the motor loop and the battery loop according to the first temperature, the second temperature and the third temperature.
Further, when the controller detects that the motor loop fails or the battery loop fails, the controller controls the four-way valve to be communicated with the motor loop and the battery loop according to the first temperature, the second temperature and the third temperature, and the method specifically comprises the following steps:
when the controller detects that the first liquid pump fails, the controller cuts off the power supply of the first liquid pump and stops sending a working instruction to the first liquid pump;
When the controller judges that the first temperature is smaller than a first threshold value, the controller controls the four-way valve to disconnect the communication between the motor loop and the battery loop;
When the controller judges that the first temperature is greater than a second threshold value, the controller controls the four-way valve to be communicated with the motor loop and the battery loop, and meanwhile, the controller drives the second liquid pump and increases the rotating speed of the second liquid pump, and the controller drives the radiator to radiate heat;
When the controller judges that the third temperature is greater than a third threshold value, an air conditioner cooling loop is started by the controller to cool the battery core of the BMS;
and when the controller judges that the third temperature is greater than the fourth threshold value, the controller controls the four-way valve to disconnect the communication between the motor loop and the battery loop.
Further, when the controller detects that the motor loop fails or the battery loop fails, the controller controls the four-way valve to be communicated with the motor loop and the battery loop according to the first temperature, the second temperature and the third temperature, and the method specifically comprises the following steps:
When the controller detects that the second liquid pump fails, the controller cuts off the power supply of the second liquid pump and stops sending working instructions to the second liquid pump;
When the controller judges that the first temperature is smaller than a fifth threshold value, the controller controls the four-way valve to be communicated with the motor loop and the battery loop, and meanwhile, the controller drives the first liquid pump and increases the rotating speed of the first liquid pump, and the controller drives the radiator to radiate heat;
When the controller judges that the first temperature is greater than a sixth threshold value, the air conditioner cooling loop is started through the controller and the first liquid pump is driven to work, the motor loop is cooled, then when the controller judges that the difference value between the first temperature and the third temperature is less than a seventh threshold value, the controller controls the four-way valve to be communicated with the motor loop and the battery loop, and meanwhile, the controller is used for improving the rotating speed of the first liquid pump and driving the radiator to radiate heat.
Further, when the controller detects that the motor loop fails or the battery loop fails, the controller controls the four-way valve to be communicated with the motor loop and the battery loop according to the first temperature, the second temperature and the third temperature, and the method specifically comprises the following steps:
When the controller detects that the second liquid pump fails, the controller cuts off the power supply of the second liquid pump and stops sending working instructions to the second liquid pump;
when the controller judges that the temperature difference between the first temperature and the second temperature is smaller than an eighth threshold value, the controller controls the four-way valve to be communicated with the motor loop and the battery loop, and meanwhile, the controller drives the first liquid pump and increases the rotating speed of the first liquid pump;
When the controller judges that the temperature difference between the first temperature and the second temperature is larger than a ninth threshold value, firstly starting an air conditioner cooling loop through the controller and driving a first liquid pump to work so as to cool a motor loop, then judging that the temperature difference between the first temperature and the second temperature is smaller than a tenth threshold value, controlling a four-way valve to be communicated with the motor loop and a battery loop through the controller, and simultaneously improving the rotating speed of the first liquid pump through the controller;
And when the third temperature is detected to be smaller than the eleventh threshold value after the preset time passes, starting the heater by the controller to heat.
The technical scheme adopted by the other aspect of the invention is as follows:
a control method of an electric automobile thermal management system comprises the following steps:
acquiring the temperature of cooling liquid of a motor loop as a first temperature;
Acquiring the temperature of the cooling liquid of the battery loop as a second temperature;
Acquiring the temperature of an electric core of the BMS in the battery loop as a third temperature;
when the motor loop is detected to be faulty or the battery loop is detected to be faulty, the four-way valve is controlled to be communicated with the motor loop and the battery loop according to the first temperature, the second temperature and the third temperature.
The technical scheme adopted by the other aspect of the invention is as follows:
A control device of an electric automobile thermal management system, comprising:
At least one memory for storing a program;
the at least one processor is used for executing the program to realize the control method of the electric automobile thermal management system.
The beneficial effects of the invention are as follows: according to the electric automobile thermal management system, the control method and the control device thereof, when the motor loop or the battery loop breaks down, the four-way valve is controlled to be communicated with the motor loop and the battery loop, and when one loop in the motor loop and the battery loop breaks down, the other loop is communicated with the four-way valve to replace work, so that the loop of the thermal management system is protected, the influence of the fault loop on the performance of a vehicle is avoided, and the service life of the vehicle is prolonged.
Drawings
Fig. 1 is a schematic structural diagram of an electric vehicle thermal management system according to an embodiment of the present invention;
fig. 2 is a diagram of a complete machine architecture of an electric automobile thermal management system according to an embodiment of the present invention;
Fig. 3 is a flowchart of a control method of an electric automobile thermal management system according to an embodiment of the present invention;
fig. 4 is another flowchart of a control method of an electric automobile thermal management system according to an embodiment of the present invention;
fig. 5 is a block diagram of a control device of an electric automobile thermal management system according to an embodiment of the present invention.
Detailed Description
Referring to fig. 1 and 2, an embodiment of the present invention provides an electric automobile thermal management system, which comprises a motor loop, a battery loop, an air conditioner cooling loop, a four-way valve 1 and a controller, wherein the motor loop comprises a first liquid supply device, a first liquid pump 2, a motor controller IPU, a motor, a charger DCDC/CCS, a first temperature sensor, a radiator and a first heat exchanger 3, the battery loop comprises a second liquid supply device, a BMS, a second temperature sensor, a heater, a second liquid pump 4 and a second heat exchanger 5, the output end of the first liquid supply device is further connected with the input end of the first liquid pump 2 through the four-way valve 1, the output end of the first liquid pump 2 is further connected with the input end of the first liquid supply device through the motor controller IPU, the motor, the charger DCDC/CCS, the first temperature sensor, the radiator and the first heat exchanger 3, the output end of the BMS is further connected with the input end of the second temperature sensor through the four-way valve 1, the output end of the second temperature sensor is further connected with the input end of the second temperature sensor 5 through the BMS, the second liquid pump 4, the second heat exchanger, the heat exchanger and the heat exchanger 3 are further connected with the first liquid pump 2, the output end of the first liquid pump 2 is further connected with the input end of the four-way valve 3 through the motor controller IPU, the second liquid pump 2, the heat exchanger and the heat exchanger.
Specifically, as shown in fig. 1, the electric vehicle thermal management system of the present embodiment is mainly divided into the following five parts:
(1) And a motor loop.
The motor loop mainly comprises high-voltage devices such as a motor controller IPU, a motor, a charger DCDC/CCS and the like, the heat dissipation mode is to utilize the first liquid pump 2 to conduct heat balance of the loop, when the liquid temperature of the loop exceeds a certain threshold value and the first liquid pump 2 works, the radiator is started to cool the cooling liquid of the loop, and the cooling liquid is driven to circulate through the first liquid pump 2.
As shown in fig. 1, the motor circuit specifically includes:
1) First liquid supply device: the input and output ends are respectively connected with the first heat exchanger 3 and the four-way valve and are used for accommodating and compensating the expansion and contraction amount of the cooling liquid in the motor loop and also used for providing the cooling liquid. The first liquid supply device can be an expansion pot.
2) The first liquid pump 2: the input and output ends are respectively connected with the four-way valve and the motor controller IPU and are used for realizing cooling liquid circulation of a motor loop and carrying out heat balance. The first liquid pump 2 corresponds to a cooling liquid, for example, the cooling liquid is water, and the first liquid pump 2 may be a water pump.
3) Motor controller IPU: the input and output ends are respectively connected with the first liquid pump 2 and the motor and used for driving the motor.
4) And (3) a motor: the input and output ends are respectively connected with the motor controller IPU and the charger DCDC/CCS and are used for providing power sources for the electric automobile.
5) Charger DCDC/CCS: the input and output ends are respectively connected with the motor and the first temperature sensor and used for charging a battery of the electric automobile and providing a required power supply for the first temperature sensor and the like through DC-DC direct current conversion.
6) A first temperature sensor: the input and output ends are respectively connected with the DCDC/CCS of the charger and the radiator and used for detecting the temperature of cooling liquid of the motor loop.
7) A radiator: the input end and the output end are respectively connected with the first temperature sensor and the first heat exchanger 3 and are used for cooling the cooling liquid of the motor loop. The heat sink may be implemented with an electronic fan.
8) The first heat exchanger 3: the input and output ends are respectively connected with the radiator and the first liquid supply device and used for exchanging heat with the air conditioner cooling loop.
(2) And a battery circuit.
The battery loop is mainly used for heating or cooling the BMS, and the cooling liquid is driven to circulate through the second liquid pump 4. As shown in fig. 1, the battery circuit specifically includes:
1) And a second liquid supply device: the input and output ends are respectively connected with the second heat exchanger 5 and the BMS, and are used for accommodating and compensating the expansion and contraction amount of the cooling liquid in the battery loop and also used for providing the cooling liquid. The second liquid supply device can be an expansion kettle.
2) BMS: and the input end and the output end of the battery management system are respectively connected with the second liquid supply device and the four-way valve and are used for feeding back the current working state (such as the temperature of the battery cell) of the BMS. The BMS is mainly used for accurately measuring the service condition of the battery pack in the vehicle system, protecting the battery from being excessively charged and discharged, balancing the electric quantity of each battery in the battery pack, analyzing and calculating the electric quantity of the battery pack, converting the electric quantity into driving-understandable endurance information, and ensuring that the power battery can safely run. The BMS internally comprises a battery core, and in the daily vehicle use process, the temperature of the battery core needs to be controlled within the optimal working temperature range so as to exert the optimal working performance. For this reason, the present invention adds a third temperature sensor for detecting the temperature of the battery cells in real time inside the BMS.
3) A second temperature sensor: the input and output ends are respectively connected with the four-way valve and the heater and are used for detecting the temperature of the cooling liquid of the battery loop.
4) A heater: the input and output terminals are respectively connected with the second temperature sensor and the second liquid pump 4 for heating in response to a heating request sent to the BMS by the controller. The heater may be a PTC heater.
5) Second liquid pump 4: the input and output ends are respectively connected with the heater and the second heat exchanger 5 for realizing the circulation of the cooling liquid of the battery loop so as to perform heat balance. The second liquid pump 4 corresponds to the cooling liquid, for example, the cooling liquid is water, and the second liquid pump 4 may be a water pump.
6) The second heat exchanger 5: the input and output ends are respectively connected with the second liquid pump 4 and the second liquid supply device and are used for exchanging heat with the air conditioner cooling loop.
(3) Air conditioner cooling circuit: the heat exchanger is used for carrying out heat exchange with a motor loop and a battery loop through the first heat exchanger 3 and the second heat exchanger 5 respectively, so that the rapid heat dissipation function of 2 loops is realized, and then the motor or the battery is protected from over-temperature.
(4) Four-way valve 1: for connecting the motor circuit and the battery circuit in series. When 2 loops do not need to be interacted, the four-way valve is closed, and the 2 loops are independently controlled, at the moment, the o pin and the p pin of the four-way valve 1 are communicated, and the s pin and the t pin are communicated; when 2 loops need to be interacted, the four-way valve is opened, 2 loops are combined into a single control loop, at the moment, the o pin and the t pin of the four-way valve 1 are communicated, the p pin and the s pin are communicated, and when a liquid pump of one loop fails, the other loop device is utilized for replacing work, so that the protection function is realized.
(5) And (3) a controller: the logic control core of the system is respectively and electrically connected with a heater, an air conditioner cooling loop, a radiator, a first temperature sensor, a second temperature sensor, a third temperature sensor, a BMS, a motor controller, a charger, a first liquid pump, a second liquid pump and the like, and is used for sending a heating request to the heater, sending a refrigerating request to the air conditioner cooling loop, sending a heat dissipation cooling request to the radiator, acquiring the temperature of the first temperature sensor, acquiring the temperature of the second temperature sensor, acquiring the temperature of the third temperature sensor, controlling the four-way valve to be communicated with or disconnected from the motor loop and the battery loop and the like. The controller may employ a VCU.
The cooling liquid in this embodiment can be flexibly selected according to actual needs, and water can be generally selected as the cooling liquid.
As shown in fig. 2 (thick black lines are buses in fig. 2), the BMS, the motor controller, the charger, the air conditioner compressor, the heater, etc. may be communicatively connected to the controller through Can buses.
As can be seen from the above description, in this embodiment, the four-way valve is used to connect the motor circuit and the battery circuit, so that the 2 thermal management circuits can be controlled simultaneously, and when the circuit devices fail to work normally, such as the liquid pump, the liquid pump of another circuit is replaced, so that the logic control of the circuit protection function is realized.
Referring to fig. 1 and 2, as a further preferred embodiment, the air conditioner cooling circuit includes a diverter 6, a first stop valve 7, an air conditioner compressor 8 and a second stop valve 9, an input end of the diverter 6 is connected with an output end of the air conditioner compressor 8, a first output end of the diverter 6 sequentially passes through the first stop valve 7 and the first heat exchanger 3 and is further connected with a first input end of the air conditioner compressor 8, a second output end of the diverter 6 sequentially passes through the second stop valve 9 and the second heat exchanger 5 and is further connected with a second input end of the air conditioner compressor 8, and the controller is respectively connected with the first stop valve 7, the air conditioner compressor 8 and the second stop valve 9.
Specifically, the main components of the air conditioning cooling circuit function as follows:
1) Shunt 6: the input end is connected with an air conditioner compressor 8, and the output end is respectively connected with a first stop valve 7 and a second stop valve 9 and is used for dividing an air conditioner cooling loop into two parts so as to distinguish two processes of heat exchange with a motor loop and heat exchange with a battery loop.
2) First shutoff valve 7: the input end and the output end are respectively connected with the diverter 6 and the first heat exchanger 3 and are used for independently controlling a loop which exchanges heat with the motor loop in the cooling loop of the air conditioner.
3) Air conditioner compressor 8: the output is connected to the flow divider 6 and the input is connected to the first heat exchanger 3 and the second heat exchanger 5, respectively, for responding to a cooling request from the controller to the motor circuit and/or the battery circuit. The air conditioning compressor 8 serves to compress refrigerant and can power the entire air conditioning cooling circuit.
Second shut-off valve 9: the input and output ends are respectively connected with the diverter 6 and the second heat exchanger 5 and are used for independently controlling a loop which exchanges heat with the battery loop in the air conditioner cooling loop.
The cooling circuit of the air conditioner compressor of the embodiment can exchange heat with the motor circuit and the battery circuit through the first heat exchanger 3 and the second heat exchanger 5 respectively. The loops share an air conditioner compressor, 2 loops are independently controlled by using 2 stop valves, and the two processes of heat exchange with a motor loop and heat exchange with a battery loop are distinguished by matching with a diverter.
Referring to fig. 2, further as a preferred embodiment, the electric motor further comprises a main relay, a first relay, a second relay and a third relay, wherein the input end of the main relay is connected with the output end of the controller, the output end of the main relay is respectively connected with an air conditioner compressor, a heater, a motor controller, a BMS, a charger, the first relay, the second relay and the third relay, the output end of the first relay is connected with the input end of the first liquid pump, the output end of the second relay is connected with the input end of the second liquid pump, and the output end of the third relay is connected with the input end of the radiator.
Specifically, the main relay, the input is connected with the output of controller, and air condition compressor, heater, motor controller, BMS, the machine that charges, first relay, second relay and third relay are connected respectively to the output for respond to the request of controller, carry out on-off control to air condition compressor, heater, motor controller, BMS, the machine that charges, first relay, second relay and third relay.
The first relay, the second relay and the third relay, the input end is connected with the main relay, and the output end is correspondingly connected with the first liquid pump, the second liquid pump and the radiator respectively and is used for controlling the first liquid pump, the second liquid pump and the radiator to be independently switched.
The main relay, the first relay, the second relay, and the third relay may be implemented using existing relays.
Referring to fig. 2, further as a preferred embodiment, a third temperature sensor is further included, and the third temperature sensor is connected to the battery cells of the BMS and the controller, respectively.
Specifically, the third temperature sensor is arranged in the BMS and used for acquiring the temperature of the battery cell of the BMS.
Referring to fig. 3, an embodiment of the present invention provides a control method of an electric vehicle thermal management system, including the following steps:
s201, acquiring the temperature of cooling liquid of a motor loop through a first temperature sensor as a first temperature;
S202, acquiring the temperature of the cooling liquid of the battery loop through a second temperature sensor as a second temperature;
S203, acquiring the temperature of the battery core of the BMS in the battery loop through a third temperature sensor as a third temperature;
And S204, when the controller detects that the motor loop breaks down or the battery loop breaks down, the four-way valve is controlled by the controller to be communicated with the motor loop and the battery loop according to the first temperature, the second temperature and the third temperature.
Specifically, the motor loop failure includes a first liquid pump failure, a radiator failure, and the like, wherein the first liquid pump failure has a great influence on heat dissipation of the motor loop.
The battery circuit faults comprise faults of the second liquid pump, faults of the heater and the like, wherein the second liquid pump faults have great influence on heat dissipation of the battery circuit.
The four-way valve is communicated with the motor loop and the battery loop, and aims to control the motor loop and the battery loop simultaneously by being connected in series as one loop, so that when a device of one loop sends a fault, the device of the other loop can be used for replacing work.
As can be seen from the above, in this embodiment, when the motor loop or the battery loop fails, the four-way valve is controlled to communicate with the motor loop and the battery loop, and when one loop of the motor loop and the battery loop fails, the other loop is communicated with the four-way valve to replace the operation, thereby protecting the loop of the thermal management system, avoiding the influence of the failed loop on the vehicle performance (mainly the heat dissipation and heating performance), and prolonging the service life of the vehicle.
Further as a preferred embodiment, when the controller detects that the motor circuit is faulty or the battery circuit is faulty, the step S204 of controlling the four-way valve to connect the motor circuit and the battery circuit by the controller according to the first temperature, the second temperature and the third temperature specifically includes:
when the controller detects that the first liquid pump fails, the controller cuts off the power supply of the first liquid pump and stops sending a working instruction to the first liquid pump;
When the controller judges that the first temperature is smaller than a first threshold value, the controller controls the four-way valve to disconnect the communication between the motor loop and the battery loop;
When the controller judges that the first temperature is greater than a second threshold value, the controller controls the four-way valve to be communicated with the motor loop and the battery loop, and meanwhile, the controller drives the second liquid pump and increases the rotating speed of the second liquid pump, and the controller drives the radiator to radiate heat;
When the controller judges that the third temperature is greater than a third threshold value, an air conditioner cooling loop is started by the controller to cool the battery core of the BMS;
and when the controller judges that the third temperature is greater than the fourth threshold value, the controller controls the four-way valve to disconnect the communication between the motor loop and the battery loop.
Specifically, the controller can detect and monitor the state, the first temperature, the second temperature, the third temperature and the like of the first liquid pump in real time, and when detecting that the first liquid pump fails, the controller can control the four-way valve to communicate the motor loop with the battery loop so as to replace the first liquid pump with the second liquid pump of the battery loop and the like to continue working, thereby reducing the influence of the first liquid pump failure on the heat management of the motor loop. When detecting that the first liquid pump breaks down, the vehicle will fall the power and travel, can send first liquid pump trouble information to instrument display simultaneously, suggestion driver: the first fluid pump failed and was requested to be serviced as soon as possible.
When the first temperature is smaller than a first threshold value, the motor loop is indicated to be free from heat dissipation and is not treated, namely, the motor loop and the battery loop are disconnected at the moment, so that the motor loop and the battery loop continue to independently operate.
The rotating speed of the second liquid pump is improved so as to meet the flow requirement of the motor loop.
When the third temperature is greater than the third threshold value, the battery cell temperature of the BMS is higher, and the air conditioner compressor needs to be started to cool the battery cell of the BMS so as to reduce the influence on the battery cell of the BMS.
When the third temperature is greater than the fourth threshold value, the battery core temperature of the BMS is too high, and the BMS can be damaged when the BMS is continuously operated, so that the communication between the motor loop and the battery loop is required to be disconnected through the four-way valve, and the BMS is protected.
The first threshold value, the second threshold value, the third threshold value and the fourth threshold value are all preset values, the preset values can be carried out according to the actual conditions of the electric automobile, and the first threshold value is more than the second threshold value and less than the third threshold value and less than the fourth threshold value.
Further as a preferred embodiment, when the controller detects that the motor circuit is faulty or the battery circuit is faulty, the step S204 of controlling the four-way valve to connect the motor circuit and the battery circuit by the controller according to the first temperature, the second temperature and the third temperature specifically includes:
When the controller detects that the second liquid pump fails, the controller cuts off the power supply of the second liquid pump and stops sending working instructions to the second liquid pump;
When the controller judges that the first temperature is smaller than a fifth threshold value, the controller controls the four-way valve to be communicated with the motor loop and the battery loop, and meanwhile, the controller drives the first liquid pump and increases the rotating speed of the first liquid pump, and the controller drives the radiator to radiate heat;
When the controller judges that the first temperature is greater than a sixth threshold value, the air conditioner cooling loop is started through the controller and the first liquid pump is driven to work, the motor loop is cooled, then when the controller judges that the difference value between the first temperature and the third temperature is less than a seventh threshold value, the controller controls the four-way valve to be communicated with the motor loop and the battery loop, and meanwhile, the controller is used for improving the rotating speed of the first liquid pump and driving the radiator to radiate heat.
Specifically, the controller can detect and monitor the state, the first temperature, the second temperature, the third temperature and the like of the second liquid pump in real time, and when the second liquid pump is detected to be faulty and the battery core of the BMS needs to dissipate heat, the four-way valve can be controlled to communicate the motor loop with the battery loop, so that the first liquid pump and the like of the motor loop are used for replacing the second liquid pump to continue to work, and the influence of the second liquid pump fault on the heat management of the battery loop is reduced. When detecting that the second liquid pump breaks down and the battery cell of BMS needs to dispel the heat, the vehicle will fall the power and go, can send second liquid pump trouble information to instrument display simultaneously, suggestion driver: the second fluid pump failed and was requested to be serviced as soon as possible.
The rotating speed of the first liquid pump is increased to meet the flow requirement of the battery loop.
When the first temperature is higher than the sixth threshold, the temperature of the cooling liquid in the motor loop is higher, so that the air conditioner compressor needs to be started to cool the motor loop first, and the damage of devices in the motor loop due to high temperature is prevented. And when the controller judges that the difference value between the first temperature and the third temperature is smaller than the seventh threshold value, the four-way valve is controlled by the controller to be communicated with the motor loop and the battery loop, so that the temperature difference between the temperature of cooling liquid of the motor loop and the temperature of the battery cell of the BMS is not too large, cold and hot impact to the battery cell of the BMS is prevented, and the battery cell of the BMS is protected.
The fifth threshold, the sixth threshold and the seventh threshold can be preset according to the actual situation of the electric automobile, and the fifth threshold is smaller than the seventh threshold and smaller than the sixth threshold.
Further as a preferred embodiment, when the controller detects that the motor circuit is faulty or the battery circuit is faulty, the step S204 of controlling the four-way valve to connect the motor circuit and the battery circuit by the controller according to the first temperature, the second temperature and the third temperature specifically includes:
When the controller detects that the second liquid pump fails, the controller cuts off the power supply of the second liquid pump and stops sending working instructions to the second liquid pump;
when the controller judges that the temperature difference between the first temperature and the second temperature is smaller than an eighth threshold value, the controller controls the four-way valve to be communicated with the motor loop and the battery loop, and meanwhile, the controller drives the first liquid pump and increases the rotating speed of the first liquid pump;
When the controller judges that the temperature difference between the first temperature and the second temperature is larger than a ninth threshold value, firstly starting an air conditioner cooling loop through the controller and driving a first liquid pump to work so as to cool a motor loop, then judging that the temperature difference between the first temperature and the second temperature is smaller than a tenth threshold value, controlling a four-way valve to be communicated with the motor loop and a battery loop through the controller, and simultaneously improving the rotating speed of the first liquid pump through the controller;
And when the third temperature is detected to be smaller than the eleventh threshold value after the preset time passes, starting the heater by the controller to heat.
Specifically, the controller can detect and monitor the state, the first temperature, the second temperature, the third temperature and the like of the second liquid pump in real time, and when the second liquid pump is detected to be faulty and the battery core of the BMS needs to be heated, the four-way valve is controlled to communicate the motor loop with the battery loop, so that the first liquid pump and the like of the motor loop are used for replacing the second liquid pump to continue working, and the influence of the second liquid pump fault on the thermal management of the battery loop is reduced. When detecting that the second liquid pump breaks down and the battery cell of BMS needs to heat, the vehicle will fall the power and go, can send second liquid pump trouble information to instrument display simultaneously, suggestion driver: the second fluid pump failed and was requested to be serviced as soon as possible.
When the motor loop and the battery loop are communicated, the battery cell needs to be heated, so that the first temperature is higher than the second temperature in the initial state, and the second temperature is positioned in the battery loop and is in positive correlation with the third temperature (namely, the temperature of the battery cell) in the battery loop (the higher the second temperature is, the higher the third temperature is). Therefore, when the temperature difference between the first temperature and the second temperature is smaller than the eighth threshold value, the temperature difference between the cooling liquid of the motor loop and the temperature of the battery core is within the allowable range, cold and hot impact cannot be caused to the battery core, at the moment, the motor loop and the battery loop are communicated through the four-way valve, meanwhile, the first liquid pump is driven through the controller, the rotating speed of the first liquid pump is increased, and the BMS is heated by waste heat of the motor. The rotating speed of the first liquid pump is increased to meet the flow requirement of the battery loop.
When the temperature difference between the first temperature and the second temperature is larger than a ninth threshold value, the temperature difference between the cooling liquid of the motor loop and the temperature of the battery core is large, cold and hot impact can be possibly caused on the battery core, at the moment, the air conditioner cooling loop is started through the controller and the first liquid pump is driven to work, the motor loop is cooled, then when the controller judges that the temperature difference between the first temperature and the second temperature is smaller than the tenth threshold value, the four-way valve is controlled by the controller to be communicated with the motor loop and the battery loop, and meanwhile, the rotating speed of the first liquid pump is increased through the controller.
When the third temperature is detected to be smaller than the eleventh threshold after the preset time, the fact that the heating requirement of the battery core cannot be met only through the motor loop is indicated, and the heater is started to heat through the controller.
The eighth threshold, the ninth threshold, the tenth threshold and the eleventh threshold may be preset according to the actual situation of the electric vehicle, and the eighth threshold is smaller than the tenth threshold and smaller than the ninth threshold.
As shown in fig. 1 and fig. 2, the cooling liquid is taken as water, the controller is a vehicle control unit VCU, the first liquid pump and the second liquid pump are both water pumps (at this time, the first liquid pump is also called a motor water pump, the second liquid pump is also called a battery water pump), the radiator is an electronic fan, and in a control loop of the thermal management system, the vehicle control unit VCU monitors and diagnoses the motor water pump, the battery water pump, the first temperature sensor, the second temperature sensor, the electronic fan and other devices in real time. When the water pump is not operated, such as water pump locked-rotor, the control method according to the present invention in this embodiment performs the following control modes:
control strategy for motor water pump failure and no work
Specifically, the specific control process when the motor water pump fails to work is as follows:
1) When the VCU diagnoses that the motor water pump fails and cannot work, the power supply of the motor water pump is disconnected, the motor water pump working instruction is stopped, meanwhile, the vehicle runs with reduced power, motor water pump failure information is sent to an instrument for display, and a driver is prompted: the motor water pump fails to work, please contact with maintenance as soon as possible;
2) The VCU judges the temperature of the first temperature sensor of the current motor loop and executes the following operations:
If the temperature of the first temperature sensor is smaller than a certain threshold T1, heat dissipation is not needed, and no treatment is performed; if the temperature of the first temperature sensor is greater than a certain threshold T2, the VCU sends a command to control the four-way valve to switch, and the motor is conducted with the battery loop;
after the 2 loops are conducted, the VCU drives the battery water pump, the battery water pump is utilized to carry out loop water circulation driving, meanwhile, the rotating speed of the battery water pump is increased to meet the flow requirement of the loops, and the electronic fan is driven to radiate heat; meanwhile, the maximum temperature of the battery core of the BMS is also judged, if the temperature of the battery core is higher than a certain threshold value T3, an air conditioner compressor is started to cool a battery loop, the heat dissipation capacity of the loop is improved, and the water temperature is reduced;
If the temperature of the battery core exceeds the early warning value T4, the control of the four-way valve is stopped, the communication of 2 loops is disconnected, and the BMS is protected.
Control strategy for failure of battery water pump
Specifically, the control process when the battery water pump fails to work includes:
(1) Control process when heat dissipation is needed for battery cell
Specifically, the specific control process when the battery cell needs to dissipate heat is as follows:
1) The VCU diagnoses that the battery water pump fails and can not work, cuts off the water pump power supply, stops sending the water pump work instruction, simultaneously, the vehicle runs the power down to send battery water pump failure information to instrument display, prompt the driver: the water pump of the battery is in fault, please contact with maintenance as soon as possible;
2) The VCU judges the temperature of a first temperature sensor of the current motor loop and executes the following operation;
If the temperature of the first temperature sensor is smaller than a certain threshold T5, the VCU controls the four-way valve to switch, the motor loop and the battery loop are conducted, the motor water pump is driven, the rotating speed of the motor water pump is increased to meet the flow requirement of the loop, and meanwhile the electronic fan is driven to work;
If the temperature of the first temperature sensor is greater than a certain threshold value T6, the VCU firstly requests to start the air conditioner compressor and drives the motor water pump to work, so as to cool the cooling liquid of the motor loop and protect the devices of the motor loop. After the temperature difference between the temperature of the first temperature sensor and the temperature of the third temperature sensor is less than a certain temperature T7 (in order to ensure that the temperature of the first temperature sensor and the temperature difference of the battery core are not too large and prevent cold and hot impact), the VCU controls the four-way valve to switch, the motor loop and the battery loop are conducted, the rotating speed of the water pump is increased, and the electronic fan is started.
(2) Control process when the cell needs to be heated
Specifically, the specific control process when the cell needs to be heated is as follows:
1) The VCU diagnoses that the battery water pump fails and can not work, cuts off the water pump power supply, stops sending the water pump work instruction, simultaneously, the vehicle runs the power down to send battery water pump failure information to instrument display, prompt the driver: the water pump of the battery is in fault, please contact with maintenance as soon as possible;
2) The VCU judges the temperature of the first temperature sensor of the current motor loop and the second temperature sensor of the battery loop, and performs the following operations:
If the temperature difference between the first temperature sensor and the second temperature sensor is less than a certain threshold value T8, the VCU controls the four-way valve to switch, the motor is conducted with the battery loop, the motor loop water pump is driven, and the rotating speed of the water pump is simultaneously increased;
If the temperature difference between the first temperature sensor and the second temperature sensor is more than a certain threshold T9, the VCU firstly requests to start the air conditioner compressor and drives the motor water pump to work, and cooling liquid in the motor loop is cooled. After the temperature difference between the first temperature sensor and the second temperature sensor is less than a certain temperature T10 (the temperature difference between the first temperature sensor and the battery core is not excessive, cold and hot impact is prevented), the VCU controls the four-way valve to switch, the motor loop and the battery loop are conducted, the motor water pump is driven, and the rotating speed of the motor water pump is simultaneously improved;
3) After a certain time, detecting the minimum temperature of the battery cell, and if the temperature of the battery cell is still lower than a certain threshold value T11, requesting to start a heater to heat by the VCU, and driving a battery water pump to work according to the maximum rotation speed.
Referring to fig. 4, an embodiment of the present invention provides a control method of an electric vehicle thermal management system, including the following steps:
S301, acquiring the temperature of cooling liquid of a motor loop as a first temperature;
s302, acquiring the temperature of the cooling liquid of the battery loop as a second temperature;
S303, acquiring the temperature of the battery cell of the BMS in the battery loop as a third temperature;
And S304, when the motor loop is detected to be failed or the battery loop is detected to be failed, controlling the four-way valve to be communicated with the motor loop and the battery loop according to the first temperature, the second temperature and the third temperature.
Specifically, the temperature of the cooling liquid of the motor loop is obtained through a first temperature sensor as a first temperature, the temperature of the cooling liquid of the battery loop is obtained through a second temperature sensor as a second temperature, the temperature of the battery core of the BMS in the battery loop is obtained through a third temperature sensor as a third temperature, and whether the motor loop fails or whether the battery loop fails is detected through a controller.
Specifically, the motor loop failure includes a first liquid pump failure, a radiator failure, and the like, wherein the first liquid pump failure has a great influence on heat dissipation of the motor loop.
The battery circuit faults comprise faults of the second liquid pump, faults of the heater and the like, wherein the second liquid pump faults have great influence on heat dissipation of the battery circuit.
The four-way valve is communicated with the motor loop and the battery loop, and aims to simultaneously control the motor loop and the battery loop through being connected in series as one loop, so that when a device of one loop sends a fault, the device of the other loop can be used for replacing work.
As can be seen from the above, in this embodiment, when the motor loop or the battery loop fails, the four-way valve is controlled to communicate with the motor loop and the battery loop, and when one loop of the motor loop and the battery loop fails, the other loop is communicated with the four-way valve to replace the operation, thereby protecting the loop of the thermal management system, avoiding the influence of the failed loop on the vehicle performance (mainly the heat dissipation and heating performance), and prolonging the service life of the vehicle.
Referring to fig. 5, an embodiment of the present invention provides a control device of a thermal management system of an electric vehicle, including:
At least one memory for storing a program;
the at least one processor is used for executing the program to realize the control method of the electric automobile thermal management system.
The content of the control method embodiment shown in fig. 4 or fig. 5 is applicable to the embodiment of the control device, and the functions of the embodiment of the control device are the same as those of the embodiment of the control method, and the achieved beneficial effects are the same as those of the embodiment of the control method.
While the preferred embodiment of the present application has been described in detail, the present application is not limited to the embodiments described above, and various equivalent modifications and substitutions can be made by those skilled in the art without departing from the spirit of the present application, and these equivalent modifications and substitutions are intended to be included in the scope of the present application as defined in the appended claims.

Claims (10)

1. An electric automobile thermal management system, characterized in that: the battery loop comprises a second liquid supply device, a BMS, a second temperature sensor, a heater, a second liquid pump and a second heat exchanger, wherein the output end of the first liquid supply device is connected with the input end of the first liquid pump through the four-way valve, the output end of the first liquid pump is sequentially connected with the input end of the first liquid pump through the motor controller, the motor, the charger, the first temperature sensor, the radiator and the first heat exchanger, the output end of the BMS is sequentially connected with the input end of the first liquid supply device through the four-way valve, the output end of the BMS is sequentially connected with the input end of the second temperature sensor through the four-way valve, the output end of the second temperature sensor is sequentially connected with the input end of the BMS through the heater, the second liquid pump, the second heat exchanger and the second liquid supply device, the first heat exchanger and the second heat exchanger are both connected with the cooling loop, and the air conditioner loop is used for carrying out heat exchange through the first heat exchange with the battery loop through the heat exchanger; the controller is connected with the four-way valve, the first liquid pump, the motor controller, the charger, the first temperature sensor, the radiator, the BMS, the second temperature sensor, the heater and the second liquid pump respectively.
2. The electric vehicle thermal management system of claim 1, wherein: the air conditioner cooling loop comprises a diverter, a first stop valve, an air conditioner compressor and a second stop valve, wherein the input end of the diverter is connected with the output end of the air conditioner compressor, the first output end of the diverter is sequentially connected with the first input end of the air conditioner compressor through the first stop valve and the first heat exchanger, the second output end of the diverter is sequentially connected with the second input end of the air conditioner compressor through the second stop valve and the second heat exchanger, and the controller is respectively connected with the first stop valve, the air conditioner compressor and the second stop valve.
3. The electric vehicle thermal management system of claim 2, wherein: still include main relay, first relay, second relay and third relay, the input of main relay is connected with the output of controller, air condition compressor, heater, motor controller, BMS, machine that charges, first relay, second relay and third relay are connected respectively to the output of main relay, the input of first liquid pump is connected to the output of first relay, the input of second liquid pump is connected to the output of second relay, the input of radiator is connected to the output of third relay.
4. An electric vehicle thermal management system according to claim 1,2 or 3, characterized in that: the battery cell and the controller of the BMS are respectively connected with the third temperature sensor.
5. A control method of an electric vehicle thermal management system for controlling the electric vehicle thermal management system according to any one of claims 1 to 4, characterized by: the method comprises the following steps:
acquiring the temperature of cooling liquid of a motor loop through a first temperature sensor as a first temperature;
acquiring the temperature of the cooling liquid of the battery loop as a second temperature through a second temperature sensor;
acquiring the temperature of the battery core of the BMS in the battery loop as a third temperature through a third temperature sensor;
When the controller detects that the motor loop breaks down or the battery loop breaks down, the four-way valve is controlled by the controller to be communicated with the motor loop and the battery loop according to the first temperature, the second temperature and the third temperature.
6. The control method of the electric automobile thermal management system according to claim 5, characterized by comprising the steps of: when the controller detects that the motor loop breaks down or the battery loop breaks down, the four-way valve is controlled to be communicated with the motor loop and the battery loop through the controller according to the first temperature, the second temperature and the third temperature, and the method specifically comprises the following steps:
when the controller detects that the first liquid pump fails, the controller cuts off the power supply of the first liquid pump and stops sending a working instruction to the first liquid pump;
When the controller judges that the first temperature is smaller than a first threshold value, the controller controls the four-way valve to disconnect the communication between the motor loop and the battery loop;
When the controller judges that the first temperature is greater than a second threshold value, the controller controls the four-way valve to be communicated with the motor loop and the battery loop, and meanwhile, the controller drives the second liquid pump and increases the rotating speed of the second liquid pump, and the controller drives the radiator to radiate heat;
When the controller judges that the third temperature is greater than a third threshold value, an air conditioner cooling loop is started by the controller to cool the battery core of the BMS;
and when the controller judges that the third temperature is greater than the fourth threshold value, the controller controls the four-way valve to disconnect the communication between the motor loop and the battery loop.
7. The control method of the electric automobile thermal management system according to claim 5, characterized by comprising the steps of: when the controller detects that the motor loop breaks down or the battery loop breaks down, the four-way valve is controlled to be communicated with the motor loop and the battery loop through the controller according to the first temperature, the second temperature and the third temperature, and the method specifically comprises the following steps:
When the controller detects that the second liquid pump fails, the controller cuts off the power supply of the second liquid pump and stops sending working instructions to the second liquid pump;
When the controller judges that the first temperature is smaller than a fifth threshold value, the controller controls the four-way valve to be communicated with the motor loop and the battery loop, and meanwhile, the controller drives the first liquid pump and increases the rotating speed of the first liquid pump, and the controller drives the radiator to radiate heat;
When the controller judges that the first temperature is greater than a sixth threshold value, the air conditioner cooling loop is started through the controller and the first liquid pump is driven to work, the motor loop is cooled, then when the controller judges that the difference value between the first temperature and the third temperature is less than a seventh threshold value, the controller controls the four-way valve to be communicated with the motor loop and the battery loop, and meanwhile, the controller is used for improving the rotating speed of the first liquid pump and driving the radiator to radiate heat.
8. The control method of the electric automobile thermal management system according to claim 5, characterized by comprising the steps of: when the controller detects that the motor loop breaks down or the battery loop breaks down, the four-way valve is controlled to be communicated with the motor loop and the battery loop through the controller according to the first temperature, the second temperature and the third temperature, and the method specifically comprises the following steps:
When the controller detects that the second liquid pump fails, the controller cuts off the power supply of the second liquid pump and stops sending working instructions to the second liquid pump;
when the controller judges that the temperature difference between the first temperature and the second temperature is smaller than an eighth threshold value, the controller controls the four-way valve to be communicated with the motor loop and the battery loop, and meanwhile, the controller drives the first liquid pump and increases the rotating speed of the first liquid pump;
When the controller judges that the temperature difference between the first temperature and the second temperature is larger than a ninth threshold value, firstly starting an air conditioner cooling loop through the controller and driving a first liquid pump to work so as to cool a motor loop, then judging that the temperature difference between the first temperature and the second temperature is smaller than a tenth threshold value, controlling a four-way valve to be communicated with the motor loop and a battery loop through the controller, and simultaneously improving the rotating speed of the first liquid pump through the controller;
And when the third temperature is detected to be smaller than the eleventh threshold value after the preset time passes, starting the heater by the controller to heat.
9. A control method of an electric vehicle thermal management system for controlling the electric vehicle thermal management system according to any one of claims 1 to 4, characterized by: the method comprises the following steps:
acquiring the temperature of cooling liquid of a motor loop as a first temperature;
Acquiring the temperature of the cooling liquid of the battery loop as a second temperature;
Acquiring the temperature of an electric core of the BMS in the battery loop as a third temperature;
when the motor loop is detected to be faulty or the battery loop is detected to be faulty, the four-way valve is controlled to be communicated with the motor loop and the battery loop according to the first temperature, the second temperature and the third temperature.
10. The utility model provides a controlling means of electric automobile thermal management system which characterized in that: comprising the following steps:
At least one memory for storing a program;
at least one processor for executing the program to implement a control method of an electric vehicle thermal management system according to any one of claims 5-9.
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