A hybrid vehicle thermal management system

Abstract

The application provides a hybrid vehicle thermal management system, which comprises a battery circulating water circuit, a motor electric control circulating water circuit, a passenger cabin heating circulating water circuit and a passenger cabin refrigeration circulating loop; the motor electric control circulating water circuit and the battery circulating water circuit share a first four-way valve; by switching the working mode of the first four-way valve, the motor electric control circulating water circuit and the battery circulating water circuit can be connected or disconnected; the passenger cabin heating circulating water circuit and the passenger cabin refrigeration circulating loop share a combined battery cooler with the battery circulating water circuit; by switching the working mode of a second four-way valve on the passenger cabin heating circulating water circuit, whether the cooling water of the passenger cabin heating circulating water circuit flows through the combined battery cooler can be controlled; by switching the working state of an electronic expansion valve on the passenger cabin refrigeration circulating loop, whether the refrigerant of the passenger cabin refrigeration circulating loop flows through the combined battery cooler can be controlled; the application can realize the recycling of motor electric control elements and engine waste heat, and make the whole vehicle more energy-saving.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of vehicle thermal management, and particularly relates to a hybrid electric vehicle thermal management system. BACKGROUND

[0002] In order to improve energy utilization efficiency, change the energy utilization system, and realize electricization, new energy and clean transportation, it is the trend and direction of urban public transportation and private transportation development. At present, electric vehicles have technical bottlenecks, and electric vehicles face charging anxiety and range anxiety. Compared with the pure electric vehicle scheme, the hybrid electric vehicle is a new energy vehicle solution with great advantages for realizing clean transportation and solving the anxiety of electric vehicle users at the present stage.

[0003] Due to the difference between the hybrid electric vehicle and the traditional fuel vehicle and the pure electric vehicle design, the whole vehicle thermal management is different from that of the traditional fuel vehicle and the pure electric vehicle. The thermal management system of the hybrid electric vehicle includes air conditioning refrigeration and heating of the passenger compartment, engine cooling, battery cooling and heating, and motor and control cooling. For the hybrid electric vehicle, due to the large number of thermal management components and different temperature requirements, the design of the whole vehicle thermal management system is complex.

[0004] In the existing hybrid power vehicle thermal management system, the motor and control thermal management system and the battery thermal management are usually independent. In the motor and control cooling system, the cooling water is pressurized by an electronic water pump, and then pumped to the motor controller (PCU for short), the water-cooled motor water jacket or the oil-cooled motor oil cooler, the charger (OBC for short) and the DCDC converter, etc. The heat of the heat generating elements is taken away by the cooling water. Finally, the heat of the cooling water is taken away by the low-temperature radiator at the front end of the vehicle using the head-on wind of the vehicle head and the forced cooling of the electronic cooling fan. Through the regulation of the electronic cooling fan, the heat generating elements in the whole system are in the best working temperature range. In the existing technology, during the use of the hybrid electric vehicle in the cold region, the temperature of the power battery approaches the parking environment temperature after long-time parking. After the vehicle starts, the power battery can only participate in the whole vehicle system function after being preheated to the allowable temperature. At present, most of the existing hybrid electric vehicles with liquid-cooled battery packs use independent electric heating components to provide power for the heating components to realize low-temperature preheating of the battery pack. Due to the limited discharge performance of the low-temperature battery pack, the heating efficiency is relatively low and the vehicle energy is wasted. In addition, when the vehicle is stored for a long time, the battery pack preheating function fails due to the lack of power input of the electric heating component, which causes the vehicle to be unable to be used normally. Therefore, how to design a hybrid electric vehicle thermal management system to improve the reliability and heat utilization rate of the thermal management system has become a technical problem that needs to be solved by the technical personnel in the field. SUMMARY

[0005] The application aims to provide a hybrid vehicle thermal management system to solve the above technical problems in the prior art.

[0006] To achieve the above object, the application provides the following technical scheme.

[0007] A hybrid vehicle thermal management system comprises a battery circulating water circuit, a motor electric control circulating water circuit, a passenger cabin heating circulating water circuit and a passenger cabin refrigeration circulating loop, the motor electric control circulating water circuit and the battery circulating water circuit share a first four-way valve, and the motor electric control circulating water circuit and the battery circulating water circuit can be connected or disconnected by switching the working mode of the first four-way valve; when the motor electric control circulating water circuit and the battery circulating water circuit are connected, the battery pack on the battery circulating water circuit can be heated or cooled by using the cooling water of the motor electric control circulating water circuit; the passenger cabin heating circulating water circuit and the passenger cabin refrigeration circulating loop share a combined battery cooler respectively, the passenger cabin heating circulating water circuit is provided with a second four-way valve, and the cooling water of the passenger cabin heating circulating water circuit can be controlled to flow through or not to flow through the combined battery cooler by switching the working mode of the second four-way valve; when the cooling water of the passenger cabin heating circulating water circuit flows through the combined battery cooler, the cooling water on the battery circulating water circuit can be heated; the passenger cabin refrigeration circulating loop is provided with an electronic expansion valve, and the refrigerant of the passenger cabin refrigeration circulating loop can be controlled to flow through or not to flow through the combined battery cooler by switching the working state of the electronic expansion valve; when the refrigerant of the passenger cabin refrigeration circulating loop flows through the combined battery cooler, the cooling water on the battery circulating water circuit can be cooled.

[0008] Preferably, the battery circulating water circuit comprises a battery water tank, a second electronic water pump, the combined battery cooler, a battery pack, the first four-way valve, the interface a of the first four-way valve is connected to the water outlet of the battery pack, and the interface b of the first four-way valve is connected to the water inlet of the battery water tank; the motor electric control circulating water circuit comprises a motor water tank, a first electronic water pump, a first four-way valve, a motor controller, a DCDC converter, a charger, a water-cooled motor or an oil-cooled motor heat exchanger, a three-way valve, and a three-way pipe one, the water outlet of the three-way pipe one is connected to the water inlet of the motor water tank, the interface g of the three-way valve is connected to the water outlet of the water-cooled motor or the oil-cooled motor heat exchanger, and the interface e of the three-way valve is connected to the first water inlet of the three-way pipe one; the motor electric control circulating water circuit further comprises a first radiator arranged between the interface f of the three-way valve and the second water inlet of the three-way pipe one; the interface c of the first four-way valve is connected to the water outlet of the first electronic water pump, and the interface d of the first four-way valve is connected to the water inlet of the motor controller; when the working mode of the first four-way valve is mode one, the interface c is connected to the interface b, the interface a is connected to the interface d, and the motor electric control circulating water circuit is connected to the battery circulating water circuit; when the working mode of the first four-way valve is mode two, the interface c is connected to the interface d, the interface a is connected to the interface b, and the motor electric control circulating water circuit is disconnected from the battery circulating water circuit.

[0009] Preferably, when the battery needs to be heated, the working mode of the first four-way valve is mode one, and the interface g of the three-way valve is controlled to be connected to the interface e; when the battery needs to be cooled, the working mode of the first four-way valve is mode one, and the interface g of the three-way valve is controlled to be connected to the interface f; when the motor electric control element needs to be kept warm, the working mode of the first four-way valve is mode two, and the interface g of the three-way valve is controlled to be connected to the interface e; when only the motor electric control element needs to be cooled, the working mode of the first four-way valve is mode two, and the interface g of the three-way valve is controlled to be connected to the interface f.

[0010] Preferably, the motor water tank, the first electronic water pump, the battery water tank, and the second electronic water pump are integrated into a motor-battery integrated module.

[0011] Preferably, the passenger cabin heating circulation water path comprises a main water pump, an engine, a three-way pipe two, a three-way pipe three, a water heater, a three-way pipe four, a heater core, the second four-way valve, a thermostat, and a water outlet of the thermostat is communicated with a water inlet of the main water pump; the passenger cabin heating circulation water path further comprises the combined battery cooler, a second radiator, a third electronic water pump, and an expansion water kettle, a water inlet of the three-way pipe two is communicated with a water outlet of the engine, a first water outlet of the three-way pipe two is communicated with a first water inlet of the three-way pipe three, the second radiator is arranged between a second water outlet of the three-way pipe two and a water inlet of the thermostat, and a water outlet of the three-way pipe three is communicated with a water inlet of the water heater; the third electronic water pump is arranged between an interface B of the second four-way valve and a second water inlet of the three-way pipe three; an interface A of the second four-way valve is communicated with the water inlet of the thermostat, and an interface C of the second four-way valve is communicated with a water outlet of the heater core; a water inlet of the three-way pipe four is communicated with a water outlet of the water heater, a first water outlet of the three-way pipe four is communicated with a water inlet of the heater core, and the combined battery cooler is arranged between an interface D of the second four-way valve and a second water outlet of the three-way pipe four; a degassing port of the expansion water kettle is respectively communicated with degassing ports of the engine, the water heater and the second radiator, and a water supplement port of the expansion water kettle is respectively communicated with water inlets of the main water pump and the third electronic water pump; a first temperature sensor for detecting the engine water outlet temperature is arranged at the water outlet of the engine, and a second temperature sensor for detecting the water heater water outlet temperature is arranged at the water outlet of the water heater.

[0012] Preferably, when the battery needs to be heated alone, if the engine water outlet temperature is less than a first set threshold, or the engine water outlet temperature is not less than the first set threshold and the temperature difference between the engine water outlet temperature and the water heater water outlet temperature is not less than a second set threshold, the third electronic water pump is enabled to work, and the interface D of the second four-way valve is communicated with the interface B; if the engine water outlet temperature is not less than the first set threshold and the temperature difference between the engine water outlet temperature and the water heater water outlet temperature is less than the second set threshold, the main water pump is enabled to work, and the interface D of the second four-way valve is communicated with the interface A.

[0013] Preferably, when the passenger cabin heating and the battery heating need to be performed simultaneously, if the engine water outlet temperature is less than the first set threshold, or the engine water outlet temperature is not less than the first set threshold and the temperature difference between the engine water outlet temperature and the water heater water outlet temperature is not less than the second set threshold, the third electronic water pump is enabled to work, and the interface D and the interface C of the second four-way valve are both communicated with the interface B; if the engine water outlet temperature is not less than the first set threshold and the temperature difference between the engine water outlet temperature and the water heater water outlet temperature is less than the second set threshold, the main water pump is enabled to work, and the interface D and the interface C of the second four-way valve are both communicated with the interface A.

[0014] Preferably, when the passenger compartment needs to be heated independently, if the engine outlet water temperature is less than the first set threshold, or the engine outlet water temperature is not less than the first set threshold and the temperature difference between the engine outlet water temperature and the water heater outlet water temperature is not less than the second set threshold, the third electronic water pump is started, and the interface C of the second four-way valve is communicated with the interface B; if the engine outlet water temperature is not less than the first set threshold and the temperature difference between the engine outlet water temperature and the water heater outlet water temperature is less than the second set threshold, the main water pump is started, and the interface C of the second four-way valve is communicated with the interface A.

[0015] Preferably, the second four-way valve, the third electronic water pump and the expansion water kettle are integrated into a heating and blowing integrated module.

[0016] Preferably, the passenger compartment refrigeration circulation loop comprises a compressor, a condenser, a three-way pipe five, a solenoid valve, a thermal expansion valve, an evaporator, a three-way pipe six, the water outlet of the three-way pipe six is communicated with the water inlet of the compressor, the first water inlet of the three-way pipe six is communicated with the water outlet of the evaporator, the water inlet of the three-way pipe five is communicated with the water outlet of the condenser, and the first water outlet of the three-way pipe five is communicated with the water inlet of the solenoid valve; the passenger compartment refrigeration circulation loop further comprises the electronic expansion valve and the combined battery cooler which are arranged in series between the second water outlet of the three-way pipe five and the second water inlet of the three-way pipe six; when the passenger compartment needs to be refrigerated independently, the solenoid valve is opened and the electronic expansion valve is closed; when the battery needs to be cooled independently, the solenoid valve is closed and the electronic expansion valve is opened; when the passenger compartment needs to be refrigerated and the battery needs to be cooled at the same time, the solenoid valve and the electronic expansion valve are both opened.

[0017] The beneficial effects of the present application are as follows:

[0018] The hybrid vehicle thermal management system can heat or cool the battery pack by using the cooling water of the motor electric control circulation waterway, heat the cooling water of the battery pack by using the cooling water of the passenger compartment heating circulation waterway, cool the cooling water of the battery pack by using the refrigerant of the passenger compartment refrigeration circulation loop, and heat the battery pack by using the waste heat of the heating elements on the motor electric control circulation waterway and the waste heat of the heating elements on the passenger compartment heating circulation waterway. Therefore, the reliability and heat utilization rate of the hybrid vehicle thermal management system are improved, the battery pack can be normally preheated at low temperature, and the vehicle is more energy-saving. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed in the embodiments, and further specifically describe the specific embodiments of the present application with reference to the drawings, in which

[0020] Figure 1 A schematic diagram of a hybrid vehicle thermal management system is provided for the embodiments of the present application.

[0021] Figure 2 A schematic diagram of a motor electric control circulating water path and a battery circulating water path is provided for the embodiments of the present application.

[0022] Figure 3 A schematic diagram of a passenger cabin heating circulating water path and a battery circulating water path is provided for the embodiments of the present application.

[0023] Figure 4 A schematic diagram of a passenger cabin refrigeration circulating loop and a battery circulating water path is provided for the embodiments of the present application.

[0024] Markings in the drawings:

[0025] 11, motor water kettle, 12, first electronic water pump, 13, motor controller,

[0026] 14, DCDC converter, 15, charger, 16, water-cooled motor or oil-cooled motor heat exchanger,

[0027] 17, three-way valve, 18, three-way pipe one, 19, first radiator;

[0028] 21, battery water kettle, 22, second electronic water pump, 23, combined battery cooler,

[0029] 24, battery pack; 31, main water pump, 32, engine, 33, three-way pipe two,

[0030] 34, three-way pipe three, 35, water heater, 36, three-way pipe four, 37, air heater water tank,

[0031] 38, second radiator, 39, thermostat; 41, expansion water kettle, 42, third electronic water pump;

[0032] 51, compressor, 52, condenser, 53, three-way pipe five, 54, solenoid valve,

[0033] 55, thermal expansion valve, 56, evaporator, 57, three-way pipe six, 58, electronic expansion valve;

[0034] 61, first four-way valve, 62, second four-way valve; 71, first temperature sensor,

[0035] 72. Second temperature sensor; 73. Third temperature sensor; 74. Fourth temperature sensor.

[0036] 75. Fifth temperature sensor. Detailed Implementation

[0037] To enable those skilled in the art to better understand the technical solution of the present invention, the present solution will be further described in detail below with reference to specific embodiments.

[0038] like Figures 1 to 4 As shown in the figure, this embodiment of the invention provides a thermal management system for a hybrid electric vehicle, which includes a battery circulating water circuit, a motor-controlled circulating water circuit, a passenger compartment heating circulating water circuit, and a passenger compartment cooling circulating circuit. The motor-controlled circulating water circuit and the battery circulating water circuit share a first four-way valve 61. By switching the operating mode of the first four-way valve 61, the motor-controlled circulating water circuit and the battery circulating water circuit can be connected or disconnected. When the motor-controlled circulating water circuit and the battery circulating water circuit are connected, the cooling water of the motor-controlled circulating water circuit can heat or cool the battery pack in the battery circulating water circuit. The passenger compartment heating circulating water circuit and the passenger compartment cooling circulating circuit share a combined battery cooler 2 with the battery circulating water circuit. 3. The passenger compartment heating circulation water circuit has a second four-way valve 62. By switching the working mode of the second four-way valve 62, it is possible to control whether the cooling water in the passenger compartment heating circulation water circuit flows through the combined battery cooler 23. When the cooling water in the passenger compartment heating circulation water circuit flows through the combined battery cooler, the cooling water in the battery circulation water circuit can be heated. The passenger compartment cooling circulation circuit has an electronic expansion valve 58. By switching the working state of the electronic expansion valve, it is possible to control whether the refrigerant in the passenger compartment cooling circulation circuit flows through the combined battery cooler. When the refrigerant in the passenger compartment cooling circulation circuit flows through the combined battery cooler, the cooling water in the battery circulation water circuit can be cooled.

[0039] The hybrid electric vehicle thermal management system provided in this invention can heat or cool the battery pack using the cooling water in the motor control circulation circuit, and can also heat the battery pack's cooling water using the cooling water in the passenger compartment heating circulation circuit. Simultaneously, it can cool the battery pack's cooling water using the refrigerant in the passenger compartment cooling circulation circuit. Therefore, this invention can utilize the waste heat from the heating elements in the motor control circulation circuit and the waste heat from the heating elements (i.e., the engine) in the passenger compartment heating circulation circuit to heat the battery pack, thereby improving the reliability and heat utilization rate of the hybrid electric vehicle thermal management system, enabling the battery pack to undergo normal low-temperature preheating, resulting in greater vehicle energy efficiency.

[0040] Further, as shown in Figure 2 The battery circulation water path includes a battery water tank 21, a second electronic water pump 22, the combined battery cooler 23, a battery pack 24, the first four-way valve 61 in series, the interface a of the first four-way valve 61 is connected to the water outlet of the battery pack 24, and the interface b of the first four-way valve 61 is connected to the water inlet of the battery water tank 21. The motor electric control circulation water path includes a motor water tank 11, a first electronic water pump 12, the first four-way valve 61, a motor controller 13, a DCDC converter 14, a charger 15, a water-cooled motor or oil-cooled motor heat exchanger 16, a three-way valve 17, a three-way pipe one 18, the water outlet of the three-way pipe one is connected to the water inlet of the motor water tank, the interface g of the three-way valve is connected to the water outlet of the water-cooled motor or oil-cooled motor heat exchanger, and the interface e of the three-way valve is connected to the first water inlet of the three-way pipe one. The motor electric control circulation water path further includes a first radiator 19 arranged between the interface f of the three-way valve 17 and the second water inlet of the three-way pipe one 18. The interface c of the first four-way valve is connected to the water outlet of the first electronic water pump, and the interface d of the first four-way valve is connected to the water inlet of the motor controller. When the working mode of the first four-way valve is mode one, the interface c is connected to the interface b, the interface a is connected to the interface d, the motor electric control circulation water path is connected to the battery circulation water path. When the working mode of the first four-way valve is mode two, the interface c is connected to the interface d, the interface a is connected to the interface b, and the motor electric control circulation water path is disconnected from the battery circulation water path.

[0041] Specifically, when the battery needs to be heated, the heat management controller sets the working mode of the first four-way valve 61 to mode one and controls the interface g of the three-way valve to be connected to the interface e. At this time, the cooling water in the motor water tank is pressurized by the first electronic water pump and then flows through the interface c of the first four-way valve→the interface b of the first four-way valve→the battery water tank→the second electronic water pump→the combined battery cooler (i.e. a three-in and three-out battery cooler)→the battery pack→the interface a of the first four-way valve→the interface d of the first four-way valve→the motor controller (PCU for short)→the DCDC converter→the charger (OBC for short)→the water-cooled motor or oil-cooled motor heat exchanger→the interface g of the three-way valve→the interface e of the three-way valve→the first water inlet of the three-way pipe one→the water outlet of the three-way pipe one→the motor water tank→the first electronic water pump for circulation, so as to utilize the waste heat of the motor electric control heat generating elements (such as the motor controller, the DCDC converter, the charger, and the water-cooled motor or oil-cooled motor heat exchanger) to assist in heating the battery, thereby realizing the utilization of waste heat.

[0042] When the battery needs to be cooled, the working mode of the first four-way valve 61 is mode one, and the interface g of the three-way valve is controlled to communicate with the interface f; at this time, the cooling water of the motor kettle is pressurized by the first electronic water pump, and then flows through the interface c of the first four-way valve → the interface b of the first four-way valve → the battery kettle → the second electronic water pump → the combined battery cooler → the battery pack → the interface a of the first four-way valve → the interface d of the first four-way valve → the motor controller → the DCDC converter → the charger → the water-cooled motor or oil-cooled motor heat exchanger → the interface g of the three-way valve → the interface f of the three-way valve → the first radiator → the second water inlet of the three-way pipe one → the water outlet of the three-way pipe one → the motor kettle → the first electronic water pump to circulate, so that the cooling water can be cooled by the oncoming wind blowing to the first radiator and the electronic cooling fan in the first radiator, and then the battery pack is cooled.

[0043] When the motor electronic control element needs to be kept warm, the working mode of the first four-way valve is mode two, and the interface g of the three-way valve is controlled to communicate with the interface e; at this time, the cooling water of the motor kettle is pressurized by the first electronic water pump, and then flows through the interface c of the first four-way valve → the interface d of the first four-way valve → the motor controller → the DCDC converter → the charger → the water-cooled motor or oil-cooled motor heat exchanger → the interface g of the three-way valve → the interface e of the three-way valve → the first water inlet of the three-way pipe one → the water outlet of the three-way pipe one → the motor kettle → the first electronic water pump to circulate, which avoids the cooling water flowing through the first radiator to prevent the temperature of the cooling water from being lowered, thereby avoiding the temperature of each motor electronic control element from being lowered.

[0044] When only the motor electronic control element needs to be cooled, the working mode of the first four-way valve is mode two, and the interface g of the three-way valve is controlled to communicate with the interface f; at this time, the cooling water of the motor kettle is pressurized by the first electronic water pump, and then flows through the interface c of the first four-way valve → the interface d of the first four-way valve → the motor controller → the DCDC converter → the charger → the water-cooled motor or oil-cooled motor heat exchanger → the interface g of the three-way valve → the interface f of the three-way valve → the first radiator → the second water inlet of the three-way pipe one → the water outlet of the three-way pipe one → the motor kettle → the first electronic water pump to circulate, which can regulate the cooling intensity of the first radiator by regulating the electronic cooling fan in the first radiator, so that the temperature of the cooling water is regulated, and then the temperature control of each motor electronic control heating element can be realized.

[0045] It can be understood that the water inlet of the battery pack can be provided with a third temperature sensor 73 for detecting the water temperature on the battery circulating water path, and the water inlet of the motor controller can be provided with a fourth temperature sensor 74 for detecting the cooling water temperature on the motor electric control circulating water path, and the third temperature sensor and the fourth temperature sensor are respectively electrically connected with the thermal management controller, and the thermal management controller controls the action state of the three-way valve and the working mode of the first four-way valve according to the temperature values of the third temperature sensor and the fourth temperature sensor, to realize the above four working requirements.

[0046] It can be preferred that the motor water kettle 11, the first electronic water pump 12, the battery water kettle 21 and the second electronic water pump 22 are integrated into a motor-battery integrated module, so as to effectively save the arrangement space.

[0047] Further, as shown in the figure, Figure 3 The passenger compartment heating circulating water path includes a main water pump 31, an engine 32, a three-way pipe two 33, a three-way pipe three 34, a water heater 35, a three-way pipe four 36, a heater core 37, the second four-way valve 62 and a thermostat 39, the water outlet of the thermostat 39 is communicated with the water inlet of the main water pump 31; the passenger compartment heating circulating water path further includes the combined battery cooler 23, a second radiator 38, a third electronic water pump 42 and an expansion water kettle 41, the water inlet of the three-way pipe two is communicated with the water outlet of the engine, the first water outlet of the three-way pipe two is communicated with the first water inlet of the three-way pipe three, the second radiator 38 is arranged between the second water outlet of the three-way pipe two 33 and the water inlet of the thermostat 39, and the water outlet of the three-way pipe three is communicated with the water inlet of the water heater; the third electronic water pump 42 is arranged between the interface B of the second four-way valve and the second water inlet of the three-way pipe three; the interface A of the second four-way valve is communicated with the water inlet of the thermostat, and the interface C of the second four-way valve is communicated with the water outlet of the heater core; the water inlet of the three-way pipe four is communicated with the water outlet of the water heater, the first water outlet of the three-way pipe four is communicated with the water inlet of the heater core, and the combined battery cooler is arranged between the interface D of the second four-way valve and the second water outlet of the three-way pipe four; the degassing port of the expansion water kettle 41 is respectively communicated with the degassing ports of the engine, the water heater and the second radiator, and the water supplement port of the expansion water kettle is respectively communicated with the water inlets of the main water pump and the third electronic water pump; the water outlet of the engine is provided with a first temperature sensor 71 for detecting the engine outlet water temperature, and the water outlet of the water heater is provided with a second temperature sensor 72 for detecting the water heater outlet water temperature.

[0048] Specifically, when the battery needs to be heated alone:

[0049] If the engine outlet water temperature (i.e. the temperature value of the first temperature sensor) is less than the first set threshold, or the engine outlet water temperature is not less than the first set threshold and the temperature difference between the engine outlet water temperature and the water heater outlet water temperature (i.e. the temperature value of the second temperature sensor) is not less than the second set threshold, the thermal management controller operates the third electronic water pump 42 and makes the interface D of the second four-way valve communicate with the interface B; at this time, the cooling water in the expansion water tank flows through the three-way pipe three → the water heater (abbreviated as WPTC) → the three-way pipe four → the combined battery cooler → the interface D of the second four-way valve → the interface B of the second four-way valve → the third electronic water pump to circulate, and at the same time, when the cooling water in the passenger cabin heating circulation water circuit flows through the combined battery cooler, heat is transferred to the cooling water in the battery circulation water circuit by heat exchange, so that the cooling water in the battery circulation water circuit is heated, thereby achieving heating of the battery pack 24; the thermal management controller adjusts the heating power of the water heater according to the temperature value of the third temperature sensor, so that the temperature value of the third temperature sensor can reach the set target value, so that the battery pack is heated to the required temperature;

[0050] If the engine outlet water temperature is not less than the first set threshold and the temperature difference between the engine outlet water temperature and the water heater outlet water temperature is less than the second set threshold, the main water pump 31 is operated and the interface D of the second four-way valve is made to communicate with the interface A; at this time, the cooling water in the expansion water tank flows through the engine (engine water jacket) and the three-way pipe two, and then is divided into two paths, one path flows through the three-way pipe three → the water heater → the three-way pipe four → the combined battery cooler → the interface D of the second four-way valve → the interface A of the second four-way valve → the thermostat → the main water pump 31 to circulate, and the other path flows through the second radiator → the thermostat → the main water pump to circulate; when the cooling water in the passenger cabin heating circulation water circuit flows through the combined battery cooler, heat is transferred to the cooling water in the battery circulation water circuit by heat exchange, so that the cooling water in the battery circulation water circuit is heated, thereby achieving heating of the battery pack using the waste heat of the engine; the thermal management controller adjusts the rotation speed of the electronic cooling fan of the second radiator according to the temperature value of the first temperature sensor, thereby adjusting the cooling intensity and further adjusting the cooling water temperature.

[0051] Further, when the passenger cabin heating and battery heating need to be performed at the same time:

[0052] If the engine outlet water temperature is less than the first set threshold, or the engine outlet water temperature is not less than the first set threshold and the temperature difference between the engine outlet water temperature and the water heater outlet water temperature is not less than the second set threshold, the third electronic water pump 42 is enabled to work, and the interface D and the interface C of the second four-way valve are both communicated with the interface B; at this time, the cooling water of the expansion water tank flows through the three-way pipe three, the water heater, and the three-way pipe four through the third electronic water pump, and is then divided into two branches, one branch circulates through the warm air water tank, the interface C of the second four-way valve, the interface B of the second four-way valve, and the third electronic water pump, so as to increase the water temperature in the warm air water tank, and then the hot water in the warm air water tank is transmitted to the air conditioning air duct through heat exchange by the air blower, so as to realize the heating demand of the passenger compartment; the other branch circulates through the combined battery cooler, the interface D of the second four-way valve, the interface B of the second four-way valve, and the third electronic water pump;

[0053] If the engine outlet water temperature is not less than the first set threshold and the temperature difference between the engine outlet water temperature and the water heater outlet water temperature is less than the second set threshold, the main water pump 31 is enabled to work, and the interface D and the interface C of the second four-way valve are both communicated with the interface A; at this time, the cooling water of the expansion water tank flows through the engine and the three-way pipe two through the main water pump, and is then divided into two branches, one branch circulates through the second radiator, the thermostat, and the main water pump; the other branch is divided into two branches again after flowing through the three-way pipe three, the water heater, and the three-way pipe four, one branch circulates through the combined battery cooler, the interface D of the second four-way valve, the interface A of the second four-way valve, the thermostat, and the main water pump, and the other branch circulates through the warm air water tank, the interface C of the second four-way valve, the interface A of the second four-way valve, and the main water pump, so as to use the waste heat of the engine to heat the passenger compartment.

[0054] It can be understood that when the battery is heated only by the passenger compartment heating circulating water path, the cooling water circulation path of the battery circulating water path is: the battery water tank, the second electronic water pump, the combined battery cooler, the battery pack, the interface a of the first four-way valve, the interface b of the first four-way valve, and the battery water tank.

[0055] Further, when the passenger compartment needs to be heated alone:

[0056] If the engine outlet water temperature is less than the first set threshold, or the engine outlet water temperature is not less than the first set threshold and the temperature difference between the engine outlet water temperature and the water heater outlet water temperature is not less than the second set threshold, the third electronic water pump 42 is enabled to work, and the interface C and the interface B of the second four-way valve are communicated; at this time, the cooling water of the expansion water tank flows through the three-way pipe three, the water heater, the three-way pipe four, the warm air water tank, the interface C of the second four-way valve, the interface B of the second four-way valve, and the third electronic water pump to circulate; the thermal management controller adjusts the heating power of the water heater according to the temperature value of the second temperature sensor until the temperature value reaches the set demand value, so as to meet the heating demand of the passenger compartment;

[0057] If the engine outlet water temperature is not less than the first set threshold value and the temperature difference between the engine outlet water temperature and the water heater outlet water temperature is less than the second set threshold value, the main water pump 31 is operated, and the interface C of the second four-way valve is communicated with the interface A. At this time, the cooling water of the expansion water tank flows through the engine, the three-way pipe two, and then is divided into two paths. One path circulates through the three-way pipe three, the water heater, the three-way pipe four, the heater core, the interface C of the second four-way valve, the interface A of the second four-way valve, the thermostat, and the main water pump, so as to realize the use of the waste heat of the engine to heat the passenger compartment; the other path circulates through the second radiator and the main water pump.

[0058] Specifically, the first set threshold value is in the range of 65℃-75℃, and can be preferably 70℃; the second set threshold value is in the range of 8℃-10℃, and can be preferably 9℃.

[0059] It can be preferred that the second four-way valve 62, the third electronic water pump 42, and the expansion water tank 41 are integrated into a heater core integrated module, so that the components are relatively compact and space-saving. It can be understood that the first radiator 19 can be a low-temperature radiator for cooling the cooling water of the motor electric control circulating water circuit; the second radiator 38 is a high-temperature radiator for cooling the cooling water of the engine; and the expansion water tank 41 is a high-temperature water tank, which, like the prior art, plays a role in water replenishment and pressure maintenance, which will not be described here.

[0060] Further, as shown in Figure 4 The passenger compartment refrigeration circulating loop includes a compressor 51, a condenser 52, a three-way pipe five 53, a solenoid valve 54, a thermal expansion valve 55, an evaporator 56, a three-way pipe six 57, an outlet of the three-way pipe six is communicated with an inlet of the compressor, a first inlet of the three-way pipe six is communicated with an outlet of the evaporator, an inlet of the three-way pipe five is communicated with an outlet of the condenser, and a first outlet of the three-way pipe five is communicated with an inlet of the solenoid valve; the passenger compartment refrigeration circulating loop further includes the electronic expansion valve 58 and the combined battery cooler 23 which are arranged in series between a second outlet of the three-way pipe five and a second inlet of the three-way pipe six; when the passenger compartment needs to be refrigerated alone, the solenoid valve 54 is opened, and the electronic expansion valve is closed. At this time, the refrigerant circulates through the compressor, the condenser, the three-way pipe five, the solenoid valve, the thermal expansion valve (TXV for short), the evaporator, the three-way pipe six, and the compressor; a sixth temperature sensor is arranged at the outlet of the evaporator, and the power of the compressor is regulated by the thermal management controller according to the temperature value of the sixth temperature sensor, i.e. the outlet temperature value of the evaporator, so as to meet the refrigeration demand of the passenger compartment.

[0061] When the battery needs to be cooled alone, the electromagnetic valve is closed, and the electronic expansion valve 58 is opened, at this time, the refrigerant circulates through the compressor, the condenser, three-way pipe five, the electronic expansion valve (EXV for short), the combined battery cooler, three-way pipe six and the compressor; the fifth temperature sensor 75 is arranged between the combined battery cooler and three-way pipe six, and the power of the compressor and the opening degree of the electronic expansion valve are regulated by the heat management controller according to the temperature value of the fifth temperature sensor, so as to meet the cooling demand of the battery pack;

[0062] When the passenger compartment refrigeration and battery cooling need to be performed at the same time, the electromagnetic valve 54 and the electronic expansion valve 58 are both opened, at this time, the refrigerant circulates through the compressor 51, the condenser 52, three-way pipe five 53, one-way through the electromagnetic valve 54, the thermal expansion valve 55, the evaporator 56, three-way pipe six 57 and the compressor 51, and the other way through the electronic expansion valve 58, the combined battery cooler 23, three-way pipe six 57 and the compressor 51, so as to realize the refrigeration of the passenger compartment by using the evaporator 56.

[0063] The application can realize heating by using engine waste heat, can also use WPTC heating when the engine is not started, can also consider the heat management of the battery, provides a more compact hybrid heat management system integrated design scheme, reduces the cost and installation and arrangement difficulty, and can realize the whole vehicle heat management and reasonable distribution and utilization of the hybrid vehicle, meets the cooling and heating needs of the vehicle under various working conditions, and can achieve the purposes of energy saving and emission reduction and prolonging the cruising range.

[0064] The above is only the preferred embodiment of the application, and it should be pointed out that the above examples are only used for illustrating the application and are not used for limiting the scope of the application, and after reading the content of the application, those skilled in the art can make various modifications or changes to the application, and these equivalent forms also fall within the scope defined by the appended claims of the application.

Claims

1. A thermal management system for a hybrid electric vehicle, characterized in that, It includes a battery circulation water circuit, a motor and electronic control circulation water circuit, a passenger compartment heating circulation water circuit, and a passenger compartment cooling circulation circuit. The motor and electronic control circulation water circuit and the battery circulation water circuit share a first four-way valve. By switching the operating mode of the first four-way valve, the motor and electronic control circulation water circuit and the battery circulation water circuit can be connected or disconnected. When the motor and electronic control circulation water circuit and the battery circulation water circuit are connected, the cooling water of the motor and electronic control circulation water circuit can be used to heat or cool the battery pack in the battery circulation water circuit. The passenger compartment heating circulation water circuit and the passenger compartment cooling circulation circuit share a combined battery cooler with the battery circulation water circuit. The passenger compartment heating circulation water circuit has a second four-way valve. By switching the operating mode of the second four-way valve, it is possible to control whether the cooling water of the passenger compartment heating circulation water circuit flows through the combined battery cooler. When the cooling water in the crew cabin heating circulation circuit flows through the combined battery cooler, it can heat the cooling water in the battery circulation circuit. The crew cabin cooling circulation circuit has an electronic expansion valve. By switching the working state of the electronic expansion valve, it is possible to control whether the refrigerant in the crew cabin cooling circulation circuit flows through the combined battery cooler. When the refrigerant in the crew cabin cooling circulation circuit flows through the combined battery cooler, it can cool the cooling water in the battery circulation circuit.

2. The hybrid electric vehicle thermal management system according to claim 1, characterized in that, The battery circulation water circuit includes a battery water tank, a second electronic water pump, the combined battery cooler, a battery pack, and a first four-way valve arranged in series. The port a of the first four-way valve is connected to the outlet of the battery pack, and the port b of the first four-way valve is connected to the inlet of the battery water tank. The motor-controlled circulating water circuit includes a motor kettle, a first electronic water pump, a first four-way valve, a motor controller, a DC-DC converter, a charger, a water-cooled motor or an oil-cooled motor heat exchanger, a three-way valve, and a three-way pipe connected in series. The outlet of the three-way pipe is connected to the inlet of the motor kettle, the interface g of the three-way valve is connected to the outlet of the water-cooled motor or oil-cooled motor heat exchanger, and the interface e of the three-way valve is connected to the first inlet of the three-way pipe. The motor-controlled circulating water circuit also includes a first radiator disposed between the interface f of the three-way valve and the second inlet of the three-way pipe; the interface c of the first four-way valve is connected to the outlet of the first electronic water pump, and the interface d of the first four-way valve is connected to the inlet of the motor controller; when the first four-way valve is in mode one, interface c is connected to interface b, interface a is connected to interface d, and the motor-controlled circulating water circuit is connected to the battery circulating water circuit; when the first four-way valve is in mode two, interface c is connected to interface d, interface a is connected to interface b, and the motor-controlled circulating water circuit is disconnected from the battery circulating water circuit.

3. The hybrid electric vehicle thermal management system according to claim 2, characterized in that, When the battery needs to be heated, the first four-way valve is set to mode one, and the interface g controlling the three-way valve is connected to the interface e. When the battery needs cooling, the first four-way valve is set to mode one, and the interface g controlling the three-way valve is connected to the interface f. When the motor and electronic control components need to be kept warm, the first four-way valve is set to mode two, and the interface g controlling the three-way valve is connected to the interface e. When only the motor and electronic control components need cooling, the first four-way valve is set to mode two, and the interface g controlling the three-way valve is connected to the interface f.

4. The hybrid electric vehicle thermal management system according to claim 2, characterized in that, The motor-driven kettle, the first electronic water pump, the battery-powered kettle, and the second electronic water pump are integrated into a motor-battery integrated module.

5. The hybrid electric vehicle thermal management system according to claim 1, characterized in that, The crew compartment heating circulation system includes a main water pump, an engine, a second three-way pipe, a third three-way pipe, a water heater, a fourth three-way pipe, a heater tank, a second four-way valve, and a thermostat, all connected in series. The outlet of the thermostat is connected to the inlet of the main water pump. The crew compartment heating circulation system also includes a combined battery cooler, a second radiator, a third electronic water pump, and an expansion tank. The inlet of the second three-way pipe is connected to the outlet of the engine, and the first outlet of the second three-way pipe is connected to the first inlet of the third three-way pipe. The second radiator is located between the second outlet of the second three-way pipe and the inlet of the thermostat. The outlet of the third three-way pipe is connected to the inlet of the water heater. The third electronic water pump is located between port B of the second four-way valve and the second inlet of the third three-way pipe. The valve's interface A is connected to the thermostat's inlet, and the second four-way valve's interface C is connected to the heater core's outlet. The three-way pipe's inlet is connected to the water heater's outlet, and the three-way pipe's first outlet is connected to the heater core's inlet. The combined battery cooler is positioned between the second four-way valve's interface D and the three-way pipe's second outlet. The expansion tank's vent is connected to the engine, the water heater, and the second radiator's vents, respectively, and the expansion tank's filler is connected to the main water pump and the third electronic water pump's inlets, respectively. A first temperature sensor for detecting the engine's outlet water temperature is installed at the engine's outlet, and a second temperature sensor for detecting the water heater's outlet water temperature is installed at the water heater's outlet.

6. The hybrid electric vehicle thermal management system according to claim 4, characterized in that, When the battery needs to be heated separately, if the engine water outlet temperature is less than the first set threshold, or if the engine water outlet temperature is not less than the first set threshold and the temperature difference between the engine water outlet temperature and the water heater outlet temperature is not less than the second set threshold, then the third electronic water pump will be activated and the interface D of the second four-way valve will be connected to the interface B. If the engine outlet water temperature is not less than the first set threshold and the temperature difference between the engine outlet water temperature and the water heater outlet water temperature is less than the second set threshold, then the main water pump will be activated and the interface D of the second four-way valve will be connected to the interface A.

7. The hybrid electric vehicle thermal management system according to claim 4, characterized in that, When crew cabin heating and battery heating need to be carried out simultaneously, if the engine outlet water temperature is less than the first set threshold, or the engine outlet water temperature is not less than the first set threshold and the temperature difference between the engine outlet water temperature and the water heater outlet water temperature is not less than the second set threshold, then the third electronic water pump will be activated and the interfaces D and C of the second four-way valve will be connected to the interface B. If the engine outlet water temperature is not less than the first set threshold and the temperature difference between the engine outlet water temperature and the water heater outlet water temperature is less than the second set threshold, then the main water pump will be activated and the ports D and C of the second four-way valve will be connected to port A.

8. The hybrid electric vehicle thermal management system according to claim 4, characterized in that, When separate heating of the passenger compartment is required, if the engine outlet water temperature is less than the first set threshold, or if the engine outlet water temperature is not less than the first set threshold and the temperature difference between the engine outlet water temperature and the water heater outlet water temperature is not less than the second set threshold, then the third electronic water pump will be activated and the interface C of the second four-way valve will be connected to the interface B. If the engine outlet water temperature is not less than the first set threshold and the temperature difference between the engine outlet water temperature and the water heater outlet water temperature is less than the second set threshold, then the main water pump will be activated and the interface C of the second four-way valve will be connected to the interface A.

9. The hybrid electric vehicle thermal management system according to claim 5, characterized in that, The second four-way valve, the third electronic water pump, and the expansion tank are integrated into a warm air integrated module.

10. The hybrid electric vehicle thermal management system according to claim 1, characterized in that, The refrigeration cycle circuit of the passenger compartment includes a compressor, a condenser, a three-way pipe (number five), a solenoid valve, a thermal expansion valve, an evaporator, and a three-way pipe (number six) arranged in series. The outlet of the three-way pipe (number six) is connected to the inlet of the compressor, the first inlet of the three-way pipe (number six) is connected to the outlet of the evaporator, the inlet of the three-way pipe (number five) is connected to the outlet of the condenser, and the first outlet of the three-way pipe (number five) is connected to the inlet of the solenoid valve. The refrigeration cycle circuit of the passenger compartment also includes an electronic expansion valve and a combined battery cooler arranged in series between the second outlet of the three-way pipe (number five) and the second inlet of the three-way pipe (number six). When the crew compartment needs to be cooled separately, the solenoid valve opens and the electronic expansion valve closes; when the battery needs to be cooled separately, the solenoid valve closes and the electronic expansion valve opens; when the crew compartment and battery need to be cooled simultaneously, both the solenoid valve and the electronic expansion valve open.

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