CN113859051A - Vehicle and control method of thermal management system thereof - Google Patents
Vehicle and control method of thermal management system thereof Download PDFInfo
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- CN113859051A CN113859051A CN202010615210.7A CN202010615210A CN113859051A CN 113859051 A CN113859051 A CN 113859051A CN 202010615210 A CN202010615210 A CN 202010615210A CN 113859051 A CN113859051 A CN 113859051A
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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
- B60L58/27—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 heating
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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
- B60H1/004—Air-conditioning arrangements specially adapted for particular vehicles for vehicles having an electrical drive, e.g. hybrid or fuel cell for vehicles having a combustion engine and electric drive means, e.g. hybrid electric vehicles
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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
- B60H1/02—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant
- B60H1/03—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant and from a source other than the propulsion plant
- B60H1/034—Heating, cooling or ventilating [HVAC] devices the heat being derived from the propulsion plant and from a source other than the propulsion plant from the cooling liquid of the propulsion plant and from an electric heating device
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- 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
- B60K1/00—Arrangement or mounting of electrical propulsion units
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- 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
- B60K11/04—Arrangement or mounting of radiators, radiator shutters, or radiator blinds
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P7/00—Controlling of coolant flow
- F01P7/14—Controlling of coolant flow the coolant being liquid
- F01P7/16—Controlling of coolant flow the coolant being liquid by thermostatic control
- F01P7/165—Controlling of coolant flow the coolant being liquid by thermostatic control characterised by systems with two or more loops
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
- F02N19/00—Starting aids for combustion engines, not otherwise provided for
- F02N19/02—Aiding engine start by thermal means, e.g. using lighted wicks
- F02N19/04—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines
- F02N19/10—Aiding engine start by thermal means, e.g. using lighted wicks by heating of fluids used in engines by heating of engine coolants
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16H—GEARING
- F16H57/00—General details of gearing
- F16H57/04—Features relating to lubrication or cooling or heating
- F16H57/0412—Cooling or heating; Control of temperature
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- 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
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K2001/003—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units
- B60K2001/006—Arrangement or mounting of electrical propulsion units with means for cooling the electrical propulsion units the electric motors
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- 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
- B60K1/00—Arrangement or mounting of electrical propulsion units
- B60K2001/008—Arrangement or mounting of electrical propulsion units with means for heating the electrical propulsion units
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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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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Transportation (AREA)
- Thermal Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Physics & Mathematics (AREA)
- Power Engineering (AREA)
- Hybrid Electric Vehicles (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Air-Conditioning For Vehicles (AREA)
Abstract
The invention discloses a vehicle and a control method of a thermal management system thereof, wherein the thermal management system comprises a cooling unit of an engine, a battery unit and a PTC heating unit, and the control method comprises the following steps: when the engine is in a low-temperature state, the heat of the engine heats the battery unit according to the outlet water temperature information of the engine, and the PTC heating unit selectively heats the battery unit. According to the control method of the thermal management system of the vehicle, when the engine is in a low-temperature state, the heat of the engine is utilized to preheat the battery unit in combination with the outlet water temperature information of the engine, and then the PTC heating unit is combined, so that the PTC heating unit can selectively determine whether to heat the battery unit according to the specific temperature information, and therefore the situation that the battery cannot be heated due to insufficient power of the battery in the related technology can be avoided.
Description
Technical Field
The invention relates to the field of vehicles, in particular to a vehicle and a control method of a thermal management system of the vehicle.
Background
The whole hybrid vehicle heat management system is divided into an engine cooling system, an inter-cooling system, a motor electric control cooling system, an air conditioning system and a battery cooling system, and all the systems operate independently. This leads to the following disadvantages:
(1) the engine warm air heating and the PTC electric heating can only be independently operated under a specific working condition, so that the cost is increased, and the energy consumption is high; (2) in the design of battery heating, only the PTC electric heater is designed to heat the battery, the efficiency is low, and the condition that the battery heating cannot be met due to insufficient battery power can occur.
Disclosure of Invention
The present invention is directed to solving at least one of the problems of the prior art. Therefore, the invention provides a control method of a thermal management system of a vehicle, which has the advantage of good performance.
The invention also provides a vehicle, and the control method of the thermal management system is applied to the thermal management system of the vehicle.
According to a control method of a thermal management system of a vehicle according to an embodiment of the present invention, the thermal management system includes a cooling unit of an engine, a battery unit, and a PTC heating unit;
the control method comprises the following steps:
when the engine is in a low-temperature state, the heat of the engine heats the battery unit according to the outlet water temperature information of the engine, and the PTC heating unit selectively heats the battery unit.
According to the control method of the thermal management system of the vehicle, when the engine is in a low-temperature state, the battery unit is preheated by using the heat of the engine in combination with the outlet water temperature information of the engine, and then the PTC heating unit is combined, so that the PTC heating unit can selectively determine whether to heat the battery unit according to the specific temperature information, and therefore the situation that the battery cannot be heated due to insufficient battery power in the related technology can be avoided.
In some embodiments, the coolant of the PTC heating unit is communicated with the cooling unit of the engine through a first stop valve, when the engine is in a low temperature state, the PTC heating unit is opened, the first stop valve is closed, and outlet water of the engine is preheated until the outlet water temperature of the engine reaches a target temperature.
In some embodiments, the cooling unit of the engine comprises a thermostat and a small circulation branch, wherein the small circulation branch is used for connecting and communicating a water outlet of the engine with the thermostat, and the thermostat is suitable for controlling the on-off of the small circulation branch;
after the water outlet of the engine is preheated, when the water outlet temperature of the engine reaches the target temperature, the engine is started, the heat of the engine heats a water path in the engine, the heated water flows through the small circulation branch, the PTC heating unit is adjusted to a preset gear, and the water path of the small circulation branch and the PTC heating unit heat the cooling liquid simultaneously.
In some embodiments, when the ambient temperature is normal, the PTC heating unit is turned off, the first stop valve is turned off, and the water in the small circulation branch heats the cooling liquid;
when the vehicle is in a hybrid mode, the air conditioning system is heated through the small circulation branch, and when the small circulation branch does not meet the requirement, the air conditioning system is heated through the PTC heating unit;
when the vehicle is in an EV mode, the PTC heating unit is connected with a warm air core body in series through a three-way electromagnetic valve to directly heat the air conditioning system;
in the battery heating process, when mixing the mode, through the small circle branch road heats the battery cell, works as when the battery cell does not reach and predetermines the temperature requirement, PTC heating element heats the battery cell.
In some embodiments, the thermal management system further comprises an integrated heating loop for heating of an air conditioning system and a battery unit, the integrated heating loop being connected in parallel with the PTC heating unit and comprising a three-way solenoid valve, a warm air core and a plate heat exchange water side structure;
in the air-conditioning heating process or the engine warming process, the PTC heating unit is adjusted to a preset gear, the three-way electromagnetic valve is communicated with a cooling flow path at the warm air core body, and the plate heat exchange water side structure loop is disconnected;
in the process of heating the battery, the three-way electromagnetic valve is connected with the plate heat exchange water side structure loop, the warm air core body loop is disconnected, and when the temperature of the battery unit does not meet the preset requirement, the battery unit is heated through the PTC electric heating unit;
when the vehicle is in an EV mode, the PTC heating unit is connected with the plate heat exchange water side structure in series through the three-way electromagnetic valve to heat the battery unit;
and in the high-temperature cooling process of the engine, the comprehensive heating loop is cut off.
In some embodiments, the thermal management system further comprises a transmission oil cooling unit and an electric machine electronically controlled cooling unit, the transmission oil cooling unit being in parallel with the electric machine electronically controlled cooling unit.
In some embodiments, the transmission oil cooling unit includes a second shutoff valve and a check valve connected in series, the second shutoff valve being open to shut off the transmission cooling circuit during engine warm-up; when the temperature of the water in the transmission is higher than a preset value, the second stop valve is closed, and the transmission cooling circuit is communicated.
In some embodiments, the second shutoff valve is closed when the vehicle is in hybrid mode and EV mode drive cooling, and the transmission cooling circuit is connected in parallel in the electric machine electronically controlled cooling unit low temperature circuit.
In some embodiments, the cooling unit of the engine comprises a thermostat, a small circulation branch and a large circulation branch, the small circulation branch is used for connecting and communicating a water outlet of the engine with the thermostat, cooling liquid of the large circulation branch flows out of the water outlet of the engine, flows through a high-temperature radiator and the thermostat and returns to the engine, and the thermostat is suitable for controlling the on-off of the large circulation branch and the small circulation branch;
in the engine warming process, the small circulation branch is opened, and the large circulation branch is closed;
after the engine is warmed up, the major cycle branch is opened, the minor cycle branch flow is gradually reduced, and when the thermostat reaches the full-open temperature, the major cycle branch is opened, and the minor cycle branch is closed.
According to the vehicle provided by the embodiment of the invention, the vehicle comprises the thermal management system, and the control method of the thermal management system is the control method of the thermal management system of the vehicle.
According to the vehicle provided by the embodiment of the invention, when the engine is in a low-temperature state, the heat of the engine is utilized to preheat the battery unit in combination with the outlet water temperature information of the engine, and then the PTC heating unit is combined, so that the PTC heating unit can selectively determine whether to heat the battery unit according to the specific temperature information, and the condition that the battery cannot be heated due to insufficient battery power in the related technology can be avoided.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
fig. 1 is a schematic structural diagram of a thermal management system of a vehicle according to an embodiment of the present invention.
Reference numerals:
1. water outlet 2 of engine and water inlet of engine
3. Small circulation branch 4, three-way electromagnetic valve
5. PTC heating unit 6, warm braw core
7. Plate heat exchange water side structure 8 and plate heat exchange cold water side structure
9. Thermostat 10, first stop valve
11. Electric control radiator 12 of motor and electric water pump II
13. Second stop valve 14, derailleur oil cooler
15. Check valve 16 and motor electronic control cooling unit
17. Electric water pump III 18 and condenser
19. Intercooler 20 and high-temperature radiator
21. Turbocharger 22, check valve one
23. Electric water pump four 24 and auxiliary water tank one
25. Temperature sensor 26 and battery pack
27. Secondary water tank II 28 and electric water pump V
29. Battery pack cooler water side 30, battery pack cooler refrigerant side
31. Throttle valve air inlet 32 and engine
33. And the electric water pump I.
Detailed Description
Embodiments of the present invention will be described in detail below, the embodiments described with reference to the drawings being illustrative, and the embodiments of the present invention will be described in detail below.
A control method of a thermal management system of a vehicle according to an embodiment of the present invention, which includes an engine 32, a battery unit, and a PTC heating unit 5, is described below with reference to fig. 1. It should be noted that the vehicle may be a new energy vehicle, which may be a hybrid vehicle; the PTC heating unit 5 includes a PTC, which may also be called a thermistor, that uses electric power for heating vehicle-related components or spaces on the new energy vehicle.
The control method of the thermal management system comprises the following steps:
when the engine 32 is in a low temperature state, the heat of the engine 32 heats the battery cell according to the outlet water temperature information of the engine 32, and the PTC heating unit 5 selectively heats the battery cell.
According to the control method of the thermal management system of the vehicle, when the engine 32 is in a low-temperature state, the battery unit is preheated by using the heat of the engine 32 in combination with the outlet water temperature information of the engine 32, and then the PTC heating unit 5 is combined, so that the PTC heating unit 5 can selectively determine whether to heat the battery unit according to the specific temperature information, and therefore the situation that the battery cannot be heated due to insufficient battery power in the related art can be avoided.
According to some embodiments of the present invention, as shown in fig. 1, the coolant of the PTC heating unit 5 is communicated with the cooling unit of the engine 32 through a first stop valve 10, the cooling unit of the engine 32 includes a thermostat 9 and a small circulation branch 3, the small circulation branch 3 is used for connecting and communicating the water outlet 1 of the engine and the thermostat 9, and the thermostat 9 is adapted to control the on-off of the small circulation branch 3.
The control method of the thermal management system further comprises the following steps: when the engine 32 is in a low-temperature state, the PTC heating unit 5 is started, the first stop valve 10 is closed, the outlet water of the engine 32 is preheated until the outlet water temperature of the engine 32 reaches a target temperature, the engine 32 is started, the heat of the engine 32 heats a water path in the engine 32, the heated water flows through the small circulation branch, the PTC heating unit 5 is adjusted to a preset gear, and the water path of the small circulation branch and the PTC heating unit 5 simultaneously heat the coolant; when the ambient temperature is normal, the PTC heating unit 5 is turned off, the first stop valve 10 is turned off, and the water in the small circulation branch heats the coolant. At this time, the small circulation branch can directly heat the coolant, so that the temperature rising speed of the coolant of the engine 32 can be increased in the warming-up process, and the warming-up time can be shortened.
Further, when the vehicle is in a hybrid mode, the air conditioning system is heated through the small circulation branch, and when the small circulation branch does not meet the requirement, the air conditioning system is heated through the PTC heating unit 5.
When the vehicle is in an EV mode, namely a pure electric mode, the PTC heating unit 5 is connected with the warm air core body 6 in series through the three-way electromagnetic valve 4 to directly heat the air conditioning system. It should be noted that "in series" herein may refer to the series connection of the cooling liquid passages of the respective portions. In the battery heating process, when the hybrid mode, heat battery unit through the small circulation branch road, when battery unit did not reach and predetermine the temperature requirement, PTC heating element 5 heats battery unit. Therefore, heat sources of the vehicle can be comprehensively allocated, a heat management system of the vehicle is subjected to refined management and control, and overhigh energy consumption is avoided when each heat source module operates independently.
It should be noted that, when the vehicle is in the hybrid mode or the EV mode, the engine is in the working state, and the engine releases heat, the water circulation system of the engine cools the engine, and the heat absorbed by the water circulation system at the engine can be taken away through the small circulation branch, and the small circulation branch can transfer the part of the heat to the air conditioning system or the battery unit, so that the heating effect of the air conditioning system or the battery unit can be realized, and the energy saving effect is further achieved.
In some embodiments, the thermal management system further comprises an integrated heating loop for air conditioning and battery unit heating, the integrated heating loop being connected in parallel with the PTC heating unit 5 and comprising the three-way solenoid valve 4, the warm air core 6 and the plate heat exchange water side structure 7. It should be noted that "parallel connection" herein may refer to parallel connection of the cooling liquid passages of the respective portions. In the air-conditioning heating process or the warming-up process of the engine 32, the PTC heating unit 5 is adjusted to a preset gear, the three-way electromagnetic valve 4 is communicated with a cooling loop at the warm air core body 6, and the loop of the plate heat exchange water side structure 7 is disconnected; in the process of battery heating, the three-way electromagnetic valve 4 is connected with a heat exchange water side structure 7 loop, the warm air core body 6 loop is disconnected, and when the temperature of the battery unit does not meet the preset requirement, the battery unit is heated through the PTC electric heating unit; when the vehicle is in the EV mode, the PTC heating unit 5 heats the battery unit through the three-way electromagnetic valve 4 serial plate heat exchange water side structure 7; in the high temperature cooling process of the engine 32, the integrated heating loop is cut off. Compared with the prior art, the warm-up time can be effectively shortened, and the oil consumption is reduced. Further, when the engine 32 is cooled at a high temperature, the integrated heating circuit can be shut off by the first shut-off valve 10, and the load on the cooling flow path of the engine 32 can be reduced. It should be noted that "in series" herein may refer to the series connection of the cooling liquid passages of the respective portions.
In some embodiments, the thermal management system further includes a transmission oil cooling unit and an electric machine electronically controlled cooling unit 16, the transmission oil cooling unit being connected in parallel with the electric machine electronically controlled cooling unit 16. The transmission oil cooling unit includes a second shutoff valve 13 and a check valve 15 in series. It should be noted that "in series" and "in parallel" herein may refer to series and parallel of the cooling liquid passages of each portion. In the related art, the transmission oil cooler 14 is connected in parallel in the high-temperature cooling loop of the engine 32, and the temperature of the water of the transmission is high, so that the temperature of the oil of the transmission is high, and the flow of a branch of the transmission oil cooler 14 is unstable, which is not beneficial to the lubrication of the transmission.
In an embodiment of the present invention, a control method of a thermal management system includes:
when the engine 32 is warmed up, the second stop valve 13 is disconnected, and the transmission cooling loop is cut off, so that the water temperature rising speed of the transmission can be increased, and the friction loss is reduced;
when the temperature of the water in the transmission is higher than a preset value, the second stop valve 13 is closed, the transmission cooling loop is communicated, and the temperature of the water in the transmission and the temperature of the oil are lower, so that the load of the high-temperature engine 32 cooling loop can be reduced, the stability of the water flow of the transmission branch is improved, the cooling of the transmission and the cooling of the engine 32 are facilitated, and the lubrication of the transmission is facilitated. In the pure electric mode, the transmission is easily cooled;
when the vehicle is in hybrid mode and EV mode running cooling, the second stop valve 13 is closed, and the transmission cooling circuit is connected in parallel in the low-temperature circuit of the electric motor electronic control cooling unit 16. It should be noted that "parallel connection" herein may refer to parallel connection of the cooling liquid passages of the respective portions.
In the related art, the small circulation branch is bypassed, and the flow of the small circulation branch 3 is still generated after the thermostat 9 is fully opened, so that the load of the engine 32 is increased, and the cooling of the engine 32 is not facilitated. According to some embodiments of the present invention, the cooling unit of the engine 32 includes a thermostat 9, a small circulation branch 3 and a large circulation branch, the small circulation branch 3 is used for connecting and communicating the water outlet 1 of the engine and the thermostat 9, after flowing out from the water outlet 1 of the engine, the coolant of the large circulation branch flows through the high temperature radiator 20 and the thermostat 9 and returns to the engine 32, and the thermostat 9 is adapted to control the on-off of the large circulation branch and the small circulation branch 3;
in the warming-up process of the engine 32, the small circulation branch 3 is opened, and the large circulation branch is closed;
after the engine 32 is warmed up, the large circulation branch is opened, the flow of the small circulation branch 3 is gradually reduced, and when the thermostat 9 reaches the full-open temperature, the large circulation branch is opened and the small circulation branch 3 is closed. This reduces the load on the cooling flow path of the engine 32, and reduces the power consumption requirement of the water pump.
According to the vehicle provided by the embodiment of the invention, the vehicle comprises the thermal management system, and the control method of the thermal management system is the control method of the thermal management system of the vehicle.
As shown in fig. 1, the thermal management system of the vehicle includes a water outlet 1 of the engine, a water inlet 2 of the engine, a small circulation branch 3, a three-way electromagnetic valve 4, a PTC heating unit 5, a warm air core 6, a plate heat exchange water side structure 7, a plate cold water side structure 8, a thermostat 9, a first stop valve 10, a motor electrically-controlled radiator 11, a second electric water pump 12, a second stop valve 13, a transmission oil cooler 14, a one-way valve 15, a motor electrically-controlled cooling unit 16, a third electric water pump 17, a condenser 18, an intercooler 19, a high-temperature radiator 20, a turbocharger 21, a one-way valve 22, a fourth electric water pump 23, a first auxiliary water tank 24, a temperature sensor 25, a battery pack 26, a second auxiliary water tank 27, a fifth electric water pump 28, a battery pack cooler water side 29, a battery pack cooler refrigerant side 30, a throttle air inlet 31, an engine 32, and a first electric water pump 33. The connection and communication of the above components are shown in fig. 1, and the connection and operation of the above components are well known to those skilled in the art and will not be described herein.
According to the vehicle of the embodiment of the invention, when the engine 32 is in a low-temperature state, the heat of the engine 32 is utilized to preheat the battery unit in combination with the outlet water temperature information of the engine 32, and the PTC heating unit 5 is combined, so that the PTC heating unit 5 can selectively determine whether to heat the battery unit according to the specific temperature information, thereby avoiding the situation that the battery cannot be heated due to insufficient battery power in the related art.
In the description herein, references to the description of the term "one embodiment," "some embodiments," "an illustrative embodiment," "an example," "a specific example," or "some examples" or the like mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example.
While embodiments of the invention have been shown and described, it will be understood by those of ordinary skill in the art that: various changes, modifications, substitutions and alterations can be made to the embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.
Claims (10)
1. A control method of a thermal management system of a vehicle, characterized in that the thermal management system includes a cooling unit of an engine, a battery unit, and a PTC heating unit;
the control method comprises the following steps:
when the engine is in a low-temperature state, the heat of the engine heats the battery unit according to the outlet water temperature information of the engine, and the PTC heating unit selectively heats the battery unit.
2. The control method of a thermal management system of a vehicle according to claim 1, wherein the coolant of the PTC heating unit and the cooling unit of the engine are communicated through a first shut-off valve,
when the engine is in a low-temperature state, the PTC heating unit is started, the first stop valve is closed, and the outlet water of the engine is preheated until the outlet water temperature of the engine reaches the target temperature.
3. The control method of the thermal management system of the vehicle according to claim 2, wherein a cooling unit of the engine includes a thermostat and a small circulation branch for connecting and communicating a water outlet of the engine and the thermostat, the thermostat being adapted to control on/off of the small circulation branch;
after the water outlet of the engine is preheated, when the water outlet temperature of the engine reaches the target temperature, the engine is started, the heat of the engine heats a water path in the engine, the heated water flows through the small circulation branch, the PTC heating unit is adjusted to a preset gear, and the water path of the small circulation branch and the PTC heating unit heat the cooling liquid simultaneously.
4. The control method of a thermal management system of a vehicle according to claim 3, wherein when a normal ambient temperature, the PTC heating unit is turned off, the first cutoff valve is turned off, and water in the small circulation branch heats the coolant;
when the vehicle is in a hybrid mode, the air conditioning system is heated through the small circulation branch, and when the small circulation branch does not meet the requirement, the air conditioning system is heated through the PTC heating unit;
when the vehicle is in an EV mode, the PTC heating unit is connected with a warm air core body in series through a three-way electromagnetic valve to directly heat the air conditioning system;
in the battery heating process, when mixing the mode, through the small circle branch road heats the battery cell, works as when the battery cell does not reach and predetermines the temperature requirement, PTC heating element heats the battery cell.
5. The method of controlling a thermal management system of a vehicle according to claim 1, wherein the thermal management system further comprises an integrated heating circuit for heating an air conditioning system and a battery unit,
the comprehensive heating loop is connected with the PTC heating unit in parallel and comprises a three-way electromagnetic valve, a warm air core body and a plate heat exchange water side structure;
in the air-conditioning heating process or the engine warming process, the PTC heating unit is adjusted to a preset gear, the three-way electromagnetic valve is communicated with a cooling flow path at the warm air core body, and the plate heat exchange water side structure loop is disconnected;
in the process of heating the battery, the three-way electromagnetic valve is connected with the plate heat exchange water side structure loop, the warm air core body loop is disconnected, and when the temperature of the battery unit does not meet the preset requirement, the battery unit is heated through the PTC electric heating unit;
when the vehicle is in an EV mode, the PTC heating unit is connected with the plate heat exchange water side structure in series through the three-way electromagnetic valve to heat the battery unit;
and in the high-temperature cooling process of the engine, the comprehensive heating loop is cut off.
6. The method of controlling a thermal management system of a vehicle of claim 1, further comprising a transmission oil cooling unit and an electric machine electronically controlled cooling unit, the transmission oil cooling unit in parallel with the electric machine electronically controlled cooling unit.
7. The control method of a thermal management system of a vehicle according to claim 6, wherein the transmission oil cooling unit includes a second shutoff valve and a check valve connected in series,
when the engine is warmed up, the second stop valve is disconnected, and the transmission cooling circuit is cut off;
when the temperature of the water in the transmission is higher than a preset value, the second stop valve is closed, and the transmission cooling circuit is communicated.
8. The control method of the thermal management system of the vehicle according to claim 6, wherein the second shutoff valve is closed when the vehicle is in a hybrid mode and an EV mode running cooling, and the transmission cooling circuit is connected in parallel in the electric machine electronically controlled cooling unit low temperature circuit.
9. The control method of the thermal management system of the vehicle according to claim 6, wherein a cooling unit of the engine comprises a thermostat, a small circulation branch and a large circulation branch, the small circulation branch is used for connecting and communicating a water outlet of the engine with the thermostat, cooling liquid of the large circulation branch flows out of the water outlet of the engine and then flows through a high-temperature radiator and the thermostat and then returns to the engine, and the thermostat is suitable for controlling the on-off of the large circulation branch and the small circulation branch;
in the engine warming process, the small circulation branch is opened, and the large circulation branch is closed;
after the engine is warmed up, the major cycle branch is opened, the minor cycle branch flow is gradually reduced, and when the thermostat reaches the full-open temperature, the major cycle branch is opened, and the minor cycle branch is closed.
10. A vehicle comprising a thermal management system, a control method of the thermal management system being the control method of the thermal management system of the vehicle according to any one of claims 1 to 9.
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