Thermal Management System and Method for Hybrid Vehicles

Abstract

The present invention discloses a thermal management system and method for a hybrid vehicle. The thermal management system of the hybrid vehicle includes an engine group cooling circuit, a motor group cooling circuit, a battery pack cooling circuit, an air conditioning device cooling circuit, and a heat exchanger. The heat exchanger is connected between the cooling circuits. A first-stage heat exchange control branch provided with a first-stage switch is connected to the engine group cooling circuit; a second-stage heat exchange control branch provided with a second-stage switch is connected to the motor group cooling circuit; a third-stage heat exchange control branch provided with a third-stage switch is connected to the battery pack cooling circuit; a fourth-stage heat exchange control branch provided with a fourth-stage switch is connected to the air conditioning device cooling circuit; the first-stage switch, the second-stage switch, the third-stage switch, and the fourth-stage switch control heat exchange between the cooling circuits through the heat exchanger. Therefore, it has the advantages of high integration degree of the thermal management system, high thermal management efficiency, and high heat utilization rate.

Description

Technical Field

[0001] The present invention relates to the field of automobiles, and particularly to a thermal management system and method for a hybrid vehicle. Background Art

[0002] An automotive thermal management system is a complex heat exchange system that covers component thermal protection in high-temperature environments, air conditioning refrigeration, as well as component anti-icing / frosting and air conditioning heating in low-temperature environments. For traditional internal combustion engine-powered vehicles, the components involved in the automotive thermal management system include the engine, transmission, oil cooler, respiratory system, air conditioner, passenger compartment, etc.; for hybrid vehicle models, a cooling system or heating system for components such as motors, batteries, and controllers is additionally added, making the thermal management system more complex.

[0003] Existing hybrid vehicle thermal management systems basically add separate motor and battery cooling systems on the basis of traditional hybrid thermal management systems. Although they have basic cooling and heating functions, their respective cooling systems operate independently, with low integration and intelligence levels, resulting in low thermal management efficiency and low heat utilization rate of the hybrid vehicle thermal management system. Summary of the Invention

[0004] The purpose of the present invention is to solve the problems in the existing thermal management system of hybrid vehicles, such as low integration, resulting in low thermal management efficiency and low heat utilization rate of the thermal management system. Therefore, the present invention provides a thermal management system and method for a hybrid vehicle, which have the advantages of high integration of the thermal management system, high thermal management efficiency, and high heat utilization rate.

[0005] To solve the above problems, an embodiment of the present invention provides a thermal management system for a hybrid vehicle, including:

[0006] An engine group cooling circuit, the engine group cooling circuit includes an engine and an engine group heat dissipation device connected in series in sequence, and the engine group heat dissipation device is used to dissipate heat from the engine;

[0007] A motor group cooling circuit, the motor group cooling circuit includes a motor and a motor group heat dissipation device connected in series in sequence, and the motor group heat dissipation device is used to dissipate heat from the motor;

[0008] A battery group cooling circuit, the battery group cooling circuit includes a battery;

[0009] An air conditioning device cooling circuit, the air conditioning device cooling circuit includes an air conditioning device;

[0010] A heat exchanger, the heat exchanger is connected between the engine group cooling circuit, the motor group cooling circuit, the battery group cooling circuit, and the air conditioning device cooling circuit; wherein,

[0011] A primary heat exchange control branch with a primary switch is connected to the engine group cooling circuit, and the primary heat exchange control branch is connected to the heat exchanger to control the connection or disconnection between the engine group cooling circuit and the heat exchanger through the primary switch;

[0012] A secondary heat exchange control branch with a secondary switch is connected to the motor group cooling circuit, and the secondary heat exchange control branch is connected to the heat exchanger to control the connection or disconnection between the motor group cooling circuit and the heat exchanger through the secondary switch;

[0013] A tertiary heat exchange control branch with a tertiary switch is connected to the battery pack cooling circuit, and the tertiary heat exchange control branch is connected to the heat exchanger to control the connection or disconnection between the battery pack cooling circuit and the heat exchanger through the tertiary switch;

[0014] A quaternary heat exchange control branch with a quaternary switch is connected to the air conditioning unit cooling circuit, and the quaternary heat exchange control branch is connected to the heat exchanger to control the connection or disconnection between the air conditioning unit cooling circuit and the heat exchanger through the quaternary switch;

[0015] Among them, the primary switch, secondary switch, tertiary switch and quaternary switch control heat exchange between the engine group cooling circuit, motor group cooling circuit, battery pack cooling circuit and air conditioning unit cooling circuit through the heat exchanger.

[0016] With the above technical solution, the thermal management system of the hybrid vehicle is divided into four cooling levels: the engine group cooling circuit, the motor group cooling circuit, the battery pack cooling circuit, and the air conditioning unit cooling circuit. The heat exchanger is connected between these four cooling circuits, so that the primary heat exchange control branch, the secondary heat exchange control branch, the tertiary heat exchange control branch, and the quaternary heat exchange control branch are all connected to the heat exchanger. When the primary switch is turned on, the engine group cooling circuit is connected to the heat exchanger, and the cooling fluid in the engine group cooling circuit can flow through the heat exchanger via the primary heat exchange control branch; when the secondary switch is turned on, the motor group cooling circuit is connected to the heat exchanger, and the cooling fluid in the motor group cooling circuit can flow through the heat exchanger via the secondary heat exchange control branch; when the tertiary switch is turned on, the battery pack cooling circuit is connected to the heat exchanger, and the cooling fluid in the battery pack cooling circuit can flow through the heat exchanger via the tertiary heat exchange control branch; when the quaternary switch is turned on, the air conditioning unit cooling circuit is connected to the heat exchanger, and the cooling fluid in the air conditioning unit cooling circuit can flow through the heat exchanger via the quaternary heat exchange control branch; when any two or any three or all four of the engine group cooling circuit, the motor group cooling circuit, the battery pack cooling circuit, and the air conditioning unit cooling circuit are connected to the heat exchanger, heat exchange can occur between any two or any three or all four of them, making full use of the heat generation capacity and heat dissipation requirements of each cooling circuit, and effectively integrating the engine group cooling circuit with the motor group cooling circuit, the battery pack cooling circuit, and the air conditioning unit cooling circuit, thereby improving the thermal management efficiency of the thermal management system. Therefore, it has the advantages of high integration degree, high thermal management efficiency, and high heat utilization rate of the thermal management system.

[0017] Furthermore, another embodiment of the present invention provides a thermal management system for a hybrid vehicle. The engine group cooling circuit further includes:

[0018] A primary water pump and a primary expansion water tank. The primary water pump is connected in series between the engine and the engine group heat dissipation device, and the primary expansion water tank is connected in series with the primary water pump and the engine in sequence to supply cooling fluid to the engine group cooling circuit;

[0019] An exhaust gas recirculation cooling device, an engine oil cooling device, and a transmission oil cooling device. The exhaust gas recirculation cooling device, the engine oil cooling device, and the transmission oil cooling device are connected in parallel and are all connected in series with the primary water pump and the engine. The engine group heat dissipation device is also used to dissipate heat from the exhaust gas recirculation cooling device, the engine oil cooling device, and the transmission oil cooling device.

[0020] Adopting the above technical solution, by arranging the exhaust gas recirculation cooling device, the engine oil cooler, the transmission oil cooler and the engine in the engine group cooling circuit, the heat generation capacity and high-temperature heat dissipation requirements of the engine, the exhaust gas recirculation cooling device, the engine oil cooler and the transmission oil cooler are fully considered. When the engine and the vehicle's transmission have heating requirements, such as during the cold start of the engine and the transmission, the engine oil and the transmission oil have low temperatures and high viscosities, and the transmission efficiency is relatively low. At this time, in the engine group cooling circuit, the heat of the engine and the exhaust gas recirculation cooling device can be used to transfer heat to the engine oil and the transmission oil through the engine oil cooler and the transmission oil cooler, reducing the frictional loss during the cold start process and improving the efficiency of the thermal management system.

[0021] Further, another embodiment of the present invention provides a thermal management system for a hybrid vehicle. The engine group heat dissipation device includes a thermostat and an engine group radiator connected in series in sequence. The thermostat is used to adjust the flow rate of the cooling fluid introduced into the engine group radiator according to the temperature of the cooling fluid at the outlet of the engine.

[0022] The transmission oil cooler includes a transmission check valve and a transmission oil cooler connected in series in sequence. The cooling fluid in the engine group cooling circuit exchanges heat with the transmission oil cooler through the transmission check valve.

[0023] Adopting the above technical solution, by setting the transmission check valve, when the engine group cooling circuit transfers heat to the motor group cooling circuit, by controlling the transmission check valve to close, the cooling fluid in the engine group cooling circuit is prevented from exchanging heat with the transmission oil cooler, so as to avoid the transmission oil from absorbing heat and reducing the heat transferred from the engine group cooling circuit to the motor group cooling circuit.

[0024] Further, another embodiment of the present invention provides a thermal management system for a hybrid vehicle. The motor group cooling circuit further includes:

[0025] A secondary water pump and a secondary expansion water tank, the secondary water pump and the secondary expansion water tank are connected in series, and are both connected to the motor in series. The secondary expansion water tank provides cooling fluid to the motor group cooling circuit.

[0026] An air-to-water intercooler, the air-to-water intercooler is connected to the motor in parallel, and is connected to the secondary water pump and the secondary expansion water tank in series.

[0027] The heater core and the one-way valve of the heater core are connected in series. The heater core and the one-way valve of the heater core are both connected in series with the secondary expansion water tank, the generator, and the water-cooled intercooler in sequence, and are connected in parallel with the motor group cooling device. The cooling fluid in the motor group cooling circuit exchanges heat with the heater core through the one-way valve of the heater core.

[0028] With the above technical solution, by arranging the motor and the water-cooled intercooler in the motor group cooling circuit, the heat generation capacity and heat dissipation requirements of the motor and the water-cooled intercooler are fully considered. The cooling temperatures of the motor and the water-cooled intercooler are quite the same. When there is no heating demand in the passenger compartment, by controlling the one-way valve of the heater core to close, more cooling fluid flow can pass through the motor group cooling device, enabling the motor group cooling device to fully dissipate heat from the motor and the water-cooled intercooler and improving the heat dissipation efficiency. When the ambient temperature is relatively low and heating of the passenger compartment is required, by controlling the one-way valve of the heater core to open, the heat of the motor and the water-cooled intercooler can be transferred to the heater core for heating the passenger compartment. At this time, the heat can also be transferred from the engine group cooling circuit to the motor group cooling circuit by controlling the first-level switch to be turned on, thereby accelerating the heating effect of the passenger compartment.

[0029] Furthermore, another embodiment of the present invention provides a thermal management system for a hybrid vehicle. The battery pack cooling circuit further includes:

[0030] A tertiary water pump and a tertiary expansion water tank. The tertiary water pump and the tertiary expansion water tank are connected in series, and are both connected in series with the battery. The tertiary expansion water tank supplies cooling fluid to the battery pack cooling circuit;

[0031] A respiratory system heating water jacket and a heating water jacket one-way valve. The respiratory system heating water jacket and the heating water jacket one-way valve are connected in series. The respiratory system heating water jacket and the heating water jacket one-way valve are both connected in series with the tertiary expansion water tank, the tertiary water pump, and the battery in sequence. The cooling fluid in the battery pack cooling circuit exchanges heat with the respiratory system heating water jacket through the heating water jacket one-way valve.

[0032] With the above technical solution, by arranging the battery and the respiratory system heating water jacket in the battery pack cooling circuit, the heat generation capacity and heat dissipation requirements of the battery and the respiratory system heating water jacket are fully considered. The battery efficiency is relatively sensitive to temperature, and its efficient operating temperature range is relatively low. In a low-temperature environment, the engine respiratory system pipeline often freezes and blocks, affecting the crankcase pressure and the normal operation of the engine. Therefore, it is necessary to heat the easily frozen parts to prevent freezing and blockage. Arranging the respiratory system heating water jacket in the battery pack cooling circuit can utilize the heat of the battery in the battery pack cooling circuit to heat the respiratory system heating water jacket. When the battery temperature is low, by controlling the opening of the first-stage switch and the second-stage switch, the excess heat in the engine group cooling circuit and the motor group cooling circuit is transferred to the battery pack cooling circuit through the heat exchanger, thereby avoiding the freezing and blockage of the engine respiratory system pipeline and improving the heat utilization rate at the same time.

[0033] Further, another embodiment of the present invention provides a thermal management system for a hybrid vehicle. The air conditioning device includes:

[0034] A compressor, a condenser, an expansion valve, and an evaporator connected in series in sequence.

[0035] With the above technical solution, by arranging the air conditioning device in the air conditioning device cooling circuit, the evaporator cools the air output of the air conditioner for refrigerating the entire vehicle passenger compartment. By controlling the opening of the fourth-stage switch, it is possible to cool the engine group cooling circuit, the motor group cooling circuit, and the battery group cooling circuit through the air conditioning device in the air conditioning device cooling circuit to meet the heat dissipation requirements of each thermal management component in each cooling circuit.

[0036] Another embodiment of the present invention provides a thermal management method for a hybrid vehicle, which is applicable to the above thermal management system for a hybrid vehicle. The thermal management method for a hybrid vehicle includes the following steps:

[0037] Real-time detect the first-stage temperature Ta at the outlet of the engine and compare it with the set first-stage temperature range of the engine group cooling circuit, where the first-stage temperature range is T1~T2, and T1>T2;

[0038] Real-time detect the second-stage temperature Tb at the outlet of the motor and compare it with the set second-stage temperature range of the motor group cooling circuit, where the second-stage temperature range is T2~T3, and T2>T3;

[0039] Real-time detect the third-stage temperature Tc at the outlet of the battery and compare it with the set third-stage temperature range of the battery group cooling circuit, where the third-stage temperature range is T3~T4, and T3>T4;

[0040] The four - stage temperature Td at the outlet of the air - conditioning device is detected in real time and compared with the set four - stage temperature range of the cooling circuit of the air - conditioning device. Among them, the four - stage temperature range is T4~T5, and T4>T5;

[0041] According to the above comparison results, the opening or closing of the first - stage switch, second - stage switch, third - stage switch, and fourth - stage switch is controlled respectively.

[0042] Adopting the above technical solution, by controlling the cooling circuit of the engine group within the first - stage temperature range T1~T2, the cooling circuit of the motor group within the second - stage temperature range T2~T3, the cooling circuit of the battery group within the third - stage temperature range T3~T4, and the cooling circuit of the air - conditioning device within the fourth - stage temperature range T4~T5, and T1>T2>T3>T4>T5, the temperatures of the four cooling levels decrease gradually. By detecting the first - stage temperature Ta, second - stage temperature Tb, third - stage temperature Tc, and fourth - stage temperature Td in real time and comparing them with the corresponding temperature ranges, the opening or closing of the first - stage switch, second - stage switch, third - stage switch, and fourth - stage switch is controlled respectively, realizing the control and coordination among the four cooling levels of the engine - group cooling circuit, motor - group cooling circuit, battery - group cooling circuit, and air - conditioning - device cooling circuit, so that the engine - group cooling circuit, motor - group cooling circuit, battery - group cooling circuit, and air - conditioning - device cooling circuit are respectively controlled within reasonable temperature ranges, and realizing the gradual transfer of heat, meeting the heat - exchange requirements of high - temperature heat dissipation and low - temperature heating in each cooling circuit, achieving the purpose of improving the thermal - management efficiency of the thermal - management system of the hybrid vehicle and improving the overall vehicle energy utilization rate. Further, another embodiment of the present invention provides a thermal - management method for a hybrid vehicle. The steps of controlling the opening or closing of the first - stage switch, second - stage switch, third - stage switch, and fourth - stage switch respectively according to the above comparison results include:

[0043] When Ta>T1, the engine - group cooling circuit dissipates heat, and the first - stage switch, second - stage switch, third - stage switch, and fourth - stage switch are controlled to be turned on. The engine - group cooling circuit transfers heat to the motor - group cooling circuit, battery - group cooling circuit, and air - conditioning - device cooling circuit through the heat exchanger;

[0044] When T2≤Ta≤T1, the first - stage switch is controlled to be in the off state;

[0045] When Ta<T2, the engine - group cooling circuit is heated, and it is judged whether Ta is less than Tb;

[0046] If so, the first - stage switch and second - stage switch are controlled to be turned on, and the motor - group cooling circuit transfers heat to the engine - group cooling circuit through the heat exchanger;

[0047] If not, the first - stage switch and second - stage switch are controlled to be in the off state.

[0048] With the above technical solution, for the engine group cooling circuit, within the first-level temperature range T1 to T2, according to the change of the first-level temperature Ta, the engine group cooling circuit operates accordingly. That is, when Ta > T1, T2 ≤ Ta ≤ T1, Ta < T2, correspondingly, the engine group cooling circuit dissipates heat, the first-level switch is closed, and heating is carried out. At the same time, according to actual requirements, the opening of the first-level switch, second-level switch, third-level switch, and fourth-level switch is controlled, so that heat exchange is carried out between the engine group cooling circuit and the motor group cooling circuit, battery group cooling circuit, and air-conditioning unit cooling circuit through the heat exchanger to meet the high-temperature heat dissipation requirements and low-temperature heating requirements of the engine group cooling circuit.

[0049] Furthermore, another embodiment of the present invention provides a heat management method for a hybrid vehicle. According to the above comparison results, the steps of respectively controlling the opening or closing of the first-level switch, second-level switch, third-level switch, and fourth-level switch further include:

[0050] When Tb > T2, the motor group cooling circuit dissipates heat, the second-level switch, third-level switch, and fourth-level switch are controlled to open, and the motor group cooling circuit transfers heat to the battery group cooling circuit and the air-conditioning unit cooling circuit through the heat exchanger;

[0051] When T3 ≤ Tb ≤ T2, the second-level switch is controlled to be in the closed state;

[0052] When Tb < T3, the motor group cooling circuit is heated, the first-level switch is controlled to open, and the engine group cooling circuit transfers heat to the motor group cooling circuit through the heat exchanger.

[0053] With the above technical solution, for the motor group cooling circuit, within the second-level temperature range T2 to T3, according to the change of the second-level temperature Tb, the motor group cooling circuit operates accordingly. That is, when Tb > T2, T3 ≤ Tb ≤ T2, Tb < T3, correspondingly, the motor group cooling circuit dissipates heat, the second-level switch is closed, and heating is carried out. At the same time, according to actual requirements, the opening of the first-level switch, second-level switch, third-level switch, and fourth-level switch is controlled, so that heat exchange is carried out between the motor group cooling circuit and the engine group cooling circuit, battery group cooling circuit, and air-conditioning unit cooling circuit through the heat exchanger to meet the high-temperature heat dissipation requirements and low-temperature heating requirements of the motor group cooling circuit.

[0054] Furthermore, another embodiment of the present invention provides a heat management method for a hybrid vehicle. According to the above comparison results, the steps of respectively controlling the opening or closing of the first-level switch, second-level switch, third-level switch, and fourth-level switch further include:

[0055] When Tc > T3, the battery pack cooling circuit dissipates heat. Control the third-level switch and the fourth-level switch to turn on. The battery pack cooling circuit transfers heat to the air-conditioning unit cooling circuit through the heat exchanger, and determine whether Tc is greater than Tb;

[0056] If so, control the second-level switch to turn on. The battery pack cooling circuit transfers heat to the motor set cooling circuit through the heat exchanger;

[0057] If not, control the second-level switch to turn off;

[0058] When T4 ≤ Tc ≤ T3, control the third-level switch to be in the off state;

[0059] When Tc < T4, the battery pack cooling circuit is heated. Control the first-level switch, the second-level switch, and the third-level switch to turn on. The engine set cooling circuit and the motor set cooling circuit transfer heat to the battery pack cooling circuit through the heat exchanger.

[0060] Adopting the above technical solution, for the battery pack cooling circuit, within the three-level temperature range T3 - T4, according to the change of the three-level temperature Tc, the battery pack cooling circuit works accordingly. That is, when Tc > T3, T4 ≤ Tc ≤ T3, and Tc < T4, correspondingly, the battery pack cooling circuit dissipates heat, the third-level switch is turned off, and is heated; at the same time, according to actual requirements, control the opening of the first-level switch, the second-level switch, the third-level switch, and the fourth-level switch, so that heat exchange is carried out between the battery pack cooling circuit and the engine set cooling circuit, the motor set cooling circuit, and the air-conditioning unit cooling circuit through the heat exchanger to meet the high-temperature heat dissipation requirements and low-temperature heating requirements of the battery pack cooling circuit.

[0061] Furthermore, another embodiment of the present invention provides a thermal management method for a hybrid vehicle. According to the above comparison results, the steps of respectively controlling the opening or closing of the first-level switch, the second-level switch, the third-level switch, and the fourth-level switch further include:

[0062] When Td > T4, the air-conditioning unit cooling circuit dissipates heat;

[0063] When T5 ≤ Td ≤ T4, control the fourth-level switch to be in the off state;

[0064] When Td < T5, the air-conditioning unit cooling circuit is heated.

[0065] With the above technical solution, for the cooling circuit of the air conditioning device, within the four - level temperature range T4 - T5, according to the change of the four - level temperature Td, the cooling circuit of the air conditioning device operates accordingly. That is, when Td > T4, T5 ≤ Td ≤ T4, Td < T5, correspondingly, the cooling circuit of the air conditioning device dissipates heat, the four - level switch closes, and heating is carried out. At the same time, according to actual requirements, the opening of the first - level switch, second - level switch, third - level switch, and fourth - level switch is controlled, so that heat exchange is carried out between the cooling circuit of the air conditioning device and the cooling circuits of the engine group, motor group, and battery group through the heat exchanger to meet the high - temperature heat dissipation requirements and low - temperature heating requirements of the cooling circuit of the air conditioning device.

[0066] Other features and corresponding beneficial effects of the present invention are described and explained in the following part of the specification, and it should be understood that at least some of the beneficial effects are obvious from the description in the specification of the present invention. Brief Description of the Drawings

[0067] Figure 1 It is a schematic structural diagram of the thermal management system of a hybrid vehicle provided in Embodiment 1 of the present invention;

[0068] Figure 2 It is a schematic cross - sectional view of the heat exchanger in the thermal management system of a hybrid vehicle provided in Embodiment 1 of the present invention;

[0069] Figure 3 It is a schematic structural diagram of the first - level cooling pipeline of the heat exchanger in the thermal management system of a hybrid vehicle provided in Embodiment 1 of the present invention;

[0070] Figure 4 It is a schematic structural diagram of the second - level cooling pipeline and the third - level cooling pipeline of the heat exchanger in the thermal management system of a hybrid vehicle provided in Embodiment 1 of the present invention;

[0071] Figure 5 It is a schematic structural diagram of the fourth - level cooling pipeline of the heat exchanger in the thermal management system of a hybrid vehicle provided in Embodiment 1 of the present invention.

[0072] Explanation of the Reference Numerals in the Drawings:

[0073] 10, Thermal management system of a hybrid vehicle;

[0074] 100, Cooling circuit of the engine group; 110, Engine; 121, Thermostat; 122, Engine group radiator; 130, First - level water pump; 140, First - level expansion water tank; 150, Exhaust gas recirculation cooling device; 160, Engine oil cooling device; 171, Transmission one - way valve; 172, Transmission oil cooler;

[0075] 200, Motor set cooling circuit; 210, Motor; 221, Thermostat of motor set; 222, Radiator of motor set; 230, Secondary water pump; 240, Secondary expansion water tank; 250, Water-cooled intercooler; 260, Heater core; 270, Check valve of heater core

[0076] 300, Battery pack cooling circuit; 310, Battery; 320, Tertiary water pump; 330, Tertiary expansion water tank; 340, Heating water jacket of respiratory system; 350, Check valve of heating water jacket

[0077] 400, Air conditioning unit cooling circuit; 410, Compressor; 420, Condenser; 430, Expansion valve; 440, Evaporator

[0078] 500, Heat exchanger

[0079] 510, Primary cooling pipeline; 511, Microchannel; 5101, Inlet; 5102, Outlet

[0080] 520, Secondary cooling pipeline; 521, Microchannel; 5201, Inlet; 5202, Outlet

[0081] 530, Tertiary cooling pipeline; 531, Microchannel; 5301, Inlet; 5302, Outlet

[0082] 540, Quaternary cooling pipeline; 541, Microchannel; 5401, Inlet; 5402, Outlet

[0083] 550, Heat exchange fins

[0084] 600, Primary heat exchange control branch; 610, Primary switch

[0085] 700, Secondary heat exchange control branch; 710, Secondary switch

[0086] 800, Tertiary heat exchange control branch; 810, Tertiary switch

[0087] 900, Quaternary heat exchange control branch; 910, Quaternary switch Detailed implementation manners

[0088] The following specific embodiments illustrate the implementation manners of the present invention, and those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Although the description of the present invention will be introduced in conjunction with preferred embodiments, this does not mean that the features of this invention are limited to this implementation manner. On the contrary, the purpose of introducing the invention in conjunction with the implementation manner is to cover other alternatives or modifications that may be extended based on the claims of the present invention. In order to provide a deep understanding of the present invention, many specific details will be included in the following description. The present invention can also be implemented without these details. In addition, in order to avoid confusing or obscuring the key points of the present invention, some specific details will be omitted in the description. It should be noted that, without conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0089] It should be noted that in this specification, similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0090] The technical solutions of the present invention will be clearly and completely described below with reference to the drawings. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0091] In the description of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. In addition, the terms "first", "second", "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0092] In the description of the present invention, it should be noted that unless otherwise clearly specified and limited, the terms "mounted", "connected", "coupled" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium, and it can be the communication inside two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0093] To make the objectives, technical solutions, and advantages of the present invention clearer, the embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0094] Embodiment 1:

[0095] As Figure 1 shown, the thermal management system 10 of a hybrid vehicle provided by the embodiment of the present invention includes an engine group cooling circuit 100, a motor group cooling circuit 200, a battery pack cooling circuit 300, an air conditioning device cooling circuit 400, and a heat exchanger 500.

[0096] The engine group cooling circuit 100 includes an engine 110 and an engine group heat dissipation device connected in series in sequence. The engine group heat dissipation device is used to dissipate heat from the engine 110; the motor group cooling circuit 200 includes a motor 210 and a motor group heat dissipation device connected in series in sequence. The motor group heat dissipation device is used to dissipate heat from the motor 210; the battery pack cooling circuit 300 includes a battery 310; the air conditioning device cooling circuit 400 includes an air conditioning device.

[0097] The heat exchanger 500 is connected between the engine group cooling circuit 100, the motor group cooling circuit 200, the battery pack cooling circuit 300, and the air conditioning device cooling circuit 400.

[0098] Among them, a primary heat exchange control branch 600 provided with a primary switch 610 is connected to the engine group cooling circuit 100, and the primary heat exchange control branch 600 is connected to the heat exchanger 500 to control the connection or disconnection between the engine group cooling circuit 100 and the heat exchanger 500 through the primary switch 610. In this embodiment, Figure 1 the position where the primary heat exchange control branch 600 in is connected to the heat exchanger 500 is only a schematic position, not the actual position.

[0099] A secondary heat exchange control branch 700 provided with a secondary switch 710 is connected to the motor group cooling circuit 200, and the secondary heat exchange control branch 700 is connected to the heat exchanger 500 to control the connection or disconnection between the motor group cooling circuit 200 and the heat exchanger 500 through the secondary switch 710. In this embodiment, Figure 1 the position where the secondary heat exchange control branch 700 in is connected to the heat exchanger 500 is only a schematic position, not the actual position.

[0100] A tertiary heat exchange control branch 800 provided with a tertiary switch 810 is connected to the battery pack cooling circuit 300, and the tertiary heat exchange control branch 800 is connected to the heat exchanger 500 to control the connection or disconnection between the battery pack cooling circuit 300 and the heat exchanger 500 through the tertiary switch 810. In this embodiment, Figure 1The position where the tertiary heat exchange control branch 800 in [description] is connected to the heat exchanger 500 is only a schematic position, not the actual position.

[0101] A quaternary heat exchange control branch 900 provided with a quaternary switch 910 is connected to the air-conditioning unit cooling circuit 400, and the quaternary heat exchange control branch 900 is connected to the heat exchanger 500 to control the connection or disconnection between the air-conditioning unit cooling circuit 400 and the heat exchanger 500 through the quaternary switch 910. In this embodiment, Figure 1 The position where the quaternary heat exchange control branch 900 in [description] is connected to the heat exchanger 500 is only a schematic position, not the actual position.

[0102] Among them, the primary switch 610, the secondary switch 710, the tertiary switch 810, and the quaternary switch 910 control heat exchange between the engine group cooling circuit 100, the motor group cooling circuit 200, the battery pack cooling circuit 300, and the air-conditioning unit cooling circuit 400 through the heat exchanger 500. In this embodiment, the primary switch 610 is a primary cooling control valve, the secondary switch 710 is a secondary cooling control valve, the tertiary switch 810 is a tertiary cooling control valve, and the quaternary switch 910 is a quaternary cooling control valve.

[0103] In this embodiment, the thermal management system 10 of the hybrid vehicle is divided into four cooling levels: the engine group cooling circuit 100, the motor group cooling circuit 200, the battery pack cooling circuit 300, and the air conditioning device cooling circuit 400. The heat exchanger 500 is connected between each cooling circuit, so that the primary heat exchange control branch 600, the secondary heat exchange control branch 700, the tertiary heat exchange control branch 800, and the quaternary heat exchange control branch 900 are all connected to the heat exchanger 500. When the primary switch 610 is turned on, the engine group cooling circuit 100 is connected to the heat exchanger 500, and the cooling fluid in the engine group cooling circuit 100 can flow through the heat exchanger 500 through the primary heat exchange control branch 600. When the secondary switch 710 is turned on, the motor group cooling circuit 200 is connected to the heat exchanger 500, and the cooling fluid in the motor group cooling circuit 200 can flow through the heat exchanger 500 through the secondary heat exchange control branch 700. When the tertiary switch 810 is turned on, the battery pack cooling circuit 300 is connected to the heat exchanger 500, and the cooling fluid in the battery pack cooling circuit 300 can flow through the heat exchanger 500 through the tertiary heat exchange control branch 800. When the quaternary switch 910 is turned on, the air conditioning device cooling circuit 400 is connected to the heat exchanger 500, and the cooling fluid in the air conditioning device cooling circuit 400 can flow through the heat exchanger 500 through the quaternary heat exchange control path. When any two or any three or all four of the engine group cooling circuit 100, the motor group cooling circuit 200, the battery pack cooling circuit 300, and the air conditioning device cooling circuit 400 are connected to the heat exchanger 500, heat exchange can occur between any two or any three or all four of them, making full use of the heat generation capacity and heat dissipation requirements of each cooling circuit, and effectively integrating the engine group cooling circuit 100 with the motor group cooling circuit 200, the battery pack cooling circuit 300, and the air conditioning device cooling circuit 400, improving the thermal management efficiency of the thermal management system. Therefore, it has the advantages of high integration degree, high thermal management efficiency, and high heat utilization rate of the thermal management system.

[0104] The cooling fluid in the engine group cooling circuit 100, the motor group cooling circuit 200, and the battery pack cooling circuit 300 is coolant, and the cooling fluid in the air conditioning device cooling circuit 400 is refrigerant.

[0105] Furthermore, the engine group cooling circuit 100 further includes a primary water pump 130, a primary expansion water tank 140, an exhaust gas recirculation cooling device 150, an engine oil cooling device 160, and a transmission oil cooling device.

[0106] The primary water pump 130 is connected in series between the engine 110 and the engine group heat dissipation device, and the primary expansion water tank 140 is connected in series to the primary water pump 130 and the engine 110 in sequence to supply cooling fluid to the engine group cooling circuit 100.

[0107] The exhaust gas recirculation cooling device 150, the engine oil cooling device 160, and the transmission oil cooling device are connected in parallel and are all connected in series with the primary water pump 130 and the engine 110. The engine group cooling device is also used to dissipate heat from the exhaust gas recirculation cooling device 150, the engine oil cooling device 160, and the transmission oil cooling device. The exhaust gas recirculation cooling device 150 is used to cool the exhaust gas of the hybrid vehicle; the engine oil cooling device 160 is used to cool the engine oil of the engine 110 of the hybrid vehicle to ensure that the engine oil of the engine 110 is at a suitable working temperature; the transmission oil cooling device is used to cool the transmission oil of the hybrid vehicle to ensure that the transmission oil is at a suitable working temperature. In this embodiment, by arranging the exhaust gas recirculation cooling device 150, the engine oil cooling device 160, the transmission oil cooling device, and the engine 110 in the engine group cooling circuit 100, the heat generation capacity and high-temperature heat dissipation requirements of the engine 110, the exhaust gas recirculation cooling device 150, the engine oil cooling device 160, and the transmission oil cooling device are fully considered. When the engine 110 and the vehicle's transmission have heating requirements, such as during the cold start of the engine 110 and the transmission, the engine oil and the transmission oil have low temperatures and high viscosities, and the transmission efficiency is relatively low. At this time, in the engine group cooling circuit 100, the heat of the engine 110 and the exhaust gas recirculation cooling device 150 can be used to transfer heat to heat the engine oil of the engine 110 and the transmission oil through the engine oil cooling device 160 and the transmission oil cooling device, reducing the frictional loss during the cold start process and improving the efficiency of the thermal management system.

[0108] Further, the engine group cooling device includes a thermostat 121 and an engine group radiator 122 connected in series in sequence. The thermostat 121 is used to adjust the flow rate of the cooling fluid flowing into the engine group radiator 122 according to the temperature of the cooling fluid at the outlet of the engine 110.

[0109] The transmission oil cooling device includes a transmission check valve 171 and a transmission oil cooler 172 connected in series in sequence. The cooling fluid in the engine group cooling circuit 100 exchanges heat with the transmission oil cooler 172 through the transmission check valve 171.

[0110] In this embodiment, by setting the transmission check valve 171, when the engine group cooling circuit 100 transfers heat to the motor group cooling circuit 200, by controlling the transmission check valve 171 to close, the cooling fluid in the engine group cooling circuit 100 is prevented from exchanging heat with the transmission oil cooler 172, so as to avoid the transmission oil absorbing heat and reducing the heat transferred from the engine group cooling circuit 100 to the motor group cooling circuit 200.

[0111] Further, the motor set cooling circuit 200 further includes a secondary water pump 230, a secondary expansion water tank 240, a water-cooled intercooler 250, a heater core 260, and a heater core check valve 270.

[0112] The secondary water pump 230 and the secondary expansion water tank 240 are connected in series, and both are connected to the motor 210 in series. The secondary expansion water tank 240 supplies cooling fluid to the motor set cooling circuit 200.

[0113] The water-cooled intercooler 250 is connected to the motor 210 in parallel and is connected to the secondary water pump 230 and the secondary expansion water tank 240 in series. The water-cooled intercooler 250 is used to reduce the intake air temperature of the engine 110.

[0114] The heater core 260 is connected to the heater core check valve 270 in series. The heater core 260 and the heater core check valve 270 are both connected to the secondary expansion water tank 240, the generator 210, and the water-cooled intercooler 250 in series in sequence, and are connected to the motor set heat dissipation device in parallel. The cooling fluid in the motor set cooling circuit 200 exchanges heat with the heater core 260 through the heater core check valve 270. The heater core 260 heats the air blown out by the air conditioner for heating the passenger compartment of the whole vehicle.

[0115] The motor set heat dissipation device includes a motor set thermostat 221 and a motor set radiator 222 connected in series in sequence. The motor set thermostat 221 is used to adjust the flow rate of the cooling fluid flowing into the motor set radiator 222 according to the temperature of the cooling fluid at the outlet of the motor 210.

[0116] In this embodiment, by arranging the motor 210 and the water-cooled intercooler 250 in the motor set cooling circuit 200, the heat generation capacity and heat dissipation requirements of the motor 210 and the water-cooled intercooler 250 are fully considered. The cooling temperatures of the motor 210 and the water-cooled intercooler 250 are quite the same. When there is no need for heating in the passenger compartment, by controlling the heater core check valve 270 to close, more cooling fluid flow can pass through the motor set heat dissipation device, enabling the motor set heat dissipation device to fully dissipate heat from the motor 210 and the water-cooled intercooler 250 and improving the heat dissipation efficiency; when the ambient temperature is low and heating of the passenger compartment is required, by controlling the heater core check valve 270 to open, the heat of the motor 210 and the water-cooled intercooler 250 can be transferred to the heater core 260 for heating the passenger compartment. At this time, the heat can also be transferred from the engine set cooling circuit 100 to the motor set cooling circuit 200 by controlling the first-level switch 610 to open, thereby accelerating the heating effect of the passenger compartment and meeting the air conditioning heating requirements.

[0117] Further, the battery pack cooling circuit 300 further includes a three-stage water pump 320, a three-stage expansion water kettle 330, a respiratory system heating water jacket 340, and a heating water jacket one-way valve 350.

[0118] The three-stage water pump 320 and the three-stage expansion water kettle 330 are connected in series, and both are connected to the battery 310 in series. The three-stage expansion water kettle 330 supplies cooling fluid to the battery pack cooling circuit 300.

[0119] The respiratory system heating water jacket 340 and the heating water jacket one-way valve 350 are connected in series. The respiratory system heating water jacket 340 and the heating water jacket one-way valve 350 are both connected to the three-stage expansion water kettle 330, the three-stage water pump 320, and the battery 310 in series in sequence. The cooling fluid in the battery pack cooling circuit 300 exchanges heat with the respiratory system heating water jacket 340 through the heating water jacket one-way valve 350.

[0120] In this embodiment, by arranging the battery 310 and the respiratory system heating water jacket 340 in the battery pack cooling circuit 300, the heat generation capacity and heat dissipation requirements of the battery 310 and the respiratory system heating water jacket 340 are fully considered. The efficiency of the battery 310 is relatively sensitive to temperature, and its efficient working temperature range is relatively low. In a low-temperature environment, the engine respiratory system pipeline often freezes and blocks, affecting the crankcase pressure and the normal operation of the engine 110. Therefore, it is necessary to heat the easily frozen parts to prevent freezing and blocking. Arranging the respiratory system heating water jacket 340 in the battery pack cooling circuit 300 can utilize the heat of the battery 310 in the battery pack cooling circuit 300 to heat the respiratory system heating water jacket 340. When the temperature of the battery 310 is relatively low, by controlling the first-stage switch 610 and the second-stage switch 710 to be turned on, the excess heat in the engine group cooling circuit 100 and the motor group cooling circuit 200 is transferred to the battery pack cooling circuit 300 through the heat exchanger 500, thereby avoiding the freezing and blocking of the engine respiratory system pipeline and improving the heat utilization rate at the same time.

[0121] Further, the air conditioning device includes a compressor 410, a condenser 420, an expansion valve 430, and an evaporator 440 that are connected in series in sequence.

[0122] In this embodiment, by arranging the air conditioning device in the air conditioning device cooling circuit 400, the evaporator 440 cools the air output of the air conditioner for cooling the entire vehicle passenger compartment. By controlling the fourth-stage switch 910 to be turned on, the engine group cooling circuit 100, the motor group cooling circuit 200, and the battery pack cooling circuit 300 can be cooled by the air conditioning device in the air conditioning device cooling circuit 400 to meet the heat dissipation requirements of each heat management component in each cooling circuit.

[0123] Combined with Figures 2 - 5, the heat exchanger 500 in the heat management system 10 of the hybrid vehicle provided by this embodiment is a centralized heat exchanger. The heat exchanger 500 is provided with a primary cooling pipeline 510, a secondary cooling pipeline 520, a tertiary cooling pipeline 530, and a quaternary cooling pipeline 540. Heat exchange fins 550 are provided between any two of the primary cooling pipeline 510, the secondary cooling pipeline 520, the tertiary cooling pipeline 530, and the quaternary cooling pipeline 540, and all have microchannels for inputting cooling fluid.

[0124] Among them, the primary heat exchange control branch 600 is connected to the primary cooling pipeline 510. When the primary switch 610 is turned on, the cooling fluid in the engine group cooling circuit 100 flows through the primary heat exchange control branch 600, enters the microchannel 511 of the primary cooling pipeline 510 from the inlet 5101 of the primary cooling pipeline 510, and flows out from the outlet 5102 of the primary cooling pipeline 510 into the primary heat exchange control branch 600, so that the primary heat exchange control branch 600, the primary cooling pipeline 510, and the engine group cooling circuit 100 form a heat exchange circulation circuit. Conversely, when the primary switch 610 is turned off, the cooling fluid in the engine group cooling circuit 100 does not flow through the heat exchanger 500.

[0125] The secondary heat exchange control branch 700 is connected to the secondary cooling pipeline 520. When the secondary switch 710 is turned on, the cooling fluid in the motor group cooling circuit 200 flows through the secondary heat exchange control branch 700, enters the microchannel 521 of the secondary cooling pipeline 520 from the inlet 5201 of the secondary cooling pipeline 520, and flows out from the outlet 5202 of the secondary cooling pipeline 520 into the secondary heat exchange control branch 700, so that the secondary heat exchange control branch 700, the secondary cooling pipeline 520, and the motor group cooling circuit 200 form a heat exchange circulation circuit. Conversely, when the secondary switch 710 is turned off, the cooling fluid in the motor group cooling circuit 200 does not flow through the heat exchanger 500.

[0126] The tertiary heat exchange control branch 800 is connected to the tertiary cooling pipeline 530. When the tertiary switch 810 is turned on, the cooling fluid in the battery pack cooling circuit 300 flows through the tertiary heat exchange control branch 800, enters the microchannel 531 of the tertiary cooling pipeline 530 from the inlet 5301 of the tertiary cooling pipeline 530, and flows out from the outlet 5302 of the tertiary cooling pipeline 530 into the tertiary heat exchange control branch 800, so that the tertiary heat exchange control branch 800, the tertiary cooling pipeline 530, and the battery pack cooling circuit 300 form a heat exchange circulation circuit. Conversely, when the tertiary switch 810 is turned off, the cooling fluid in the battery pack cooling circuit 300 does not flow through the heat exchanger 500.

[0127] The fourth-stage heat exchange control branch 900 is connected to the fourth-stage cooling pipeline 540. When the fourth-stage switch 910 is turned on, the cooling fluid in the cooling circuit 400 of the air-conditioning device flows through the fourth-stage heat exchange control branch 900 from the inlet 5401 of the fourth-stage cooling pipeline 540 into the microchannels 541 of the fourth-stage cooling pipeline 540, and flows out from the outlet 5402 of the fourth-stage cooling pipeline 540 into the fourth-stage heat exchange control branch 900, so that the fourth-stage heat exchange control branch 900, the fourth-stage cooling pipeline 540, and the cooling circuit 400 of the air-conditioning device form a heat exchange circulation circuit. On the contrary, when the fourth-stage switch 910 is turned off, the cooling fluid in the cooling circuit 400 of the air-conditioning device does not flow through the heat exchanger 500.

[0128] Specifically, as Figure 2 shown, the fourth-stage cooling pipeline 540 is located on the periphery of the first-stage cooling pipeline 510, the second-stage cooling pipeline 520, and the third-stage cooling pipeline 530. The first-stage cooling pipeline 510 is adjacent to the second-stage cooling pipeline 520 and the third-stage cooling pipeline 530; among them, the second-stage cooling pipeline 520 and the third-stage cooling pipeline 530 are arranged on the same integrated plane.

[0129] As Figure 3 shown, the microchannels 511 of the first-stage cooling pipeline 510 extend in a straight line; as Figure 4 shown, the microchannels 521 of the second-stage cooling pipeline 520 and the microchannels 531 of the third-stage cooling pipeline 530 are arranged at intervals and are parallel to each other, and extend in an "S" shape; as Figure 5 shown, the microchannels 541 of the fourth-stage cooling pipeline 540 extend in a straight line.

[0130] Through the above arrangements of the first-stage cooling pipeline 510, the second-stage cooling pipeline 520, the third-stage cooling pipeline 530, and the fourth-stage cooling pipeline 540 in the heat exchanger 500, the following heat exchange can be achieved:

[0131] The cooling fluid in the engine group cooling circuit 100 can exchange heat with the cooling fluids in the motor group cooling circuit 200, the battery group cooling circuit 300, and the air-conditioning device cooling circuit 400 through the heat exchange fins 550. That is, the engine group cooling circuit 100 can exchange heat with the motor group cooling circuit 200, the battery group cooling circuit 300, and the air-conditioning device cooling circuit 400 through the heat exchanger 500.

[0132] Heat exchange can occur between the cooling fluids in the motor set cooling circuit 200 and the battery pack cooling circuit 300 through the heat exchange fins 550, and both can also exchange heat with the cooling fluids in the engine set cooling circuit 100 and the air conditioning unit cooling circuit 400 through the heat exchange fins 550. That is, heat exchange can occur between the motor set cooling circuit 200 and the battery pack cooling circuit 300 through the heat exchanger 500, and both can exchange heat with the engine set cooling circuit 100 and the air conditioning unit cooling circuit 400 through the heat exchanger 500.

[0133] The cooling fluid in the air conditioning unit cooling circuit 400 can exchange heat with the cooling fluids in the engine set cooling circuit 100, the motor set cooling circuit 200, and the battery pack cooling circuit 300 through the heat exchange fins 550. That is, the air conditioning unit cooling circuit 400 can exchange heat with the engine set cooling circuit 100, the motor set cooling circuit 200, and the battery pack cooling circuit 300 through the heat exchanger 500.

[0134] Those skilled in the art can understand that in other alternative embodiments, the arrangement structure of the cooling pipelines in the heat exchanger 500 can also be other structures, as long as heat exchange can be achieved between the engine set cooling circuit 100, the motor set cooling circuit 200, the battery pack cooling circuit 300, and the air conditioning unit cooling circuit 400 through the heat exchanger 500.

[0135] Embodiment 2:

[0136] A heat management method for a hybrid vehicle provided by another embodiment of the present invention is applicable to the heat management system 10 of the hybrid vehicle in Embodiment 1. The heat management method for the hybrid vehicle includes the following steps:

[0137] Real-time detect the primary temperature Ta at the outlet of the engine 110 and compare it with the set primary temperature range of the engine set cooling circuit 100, where the primary temperature range is T1 to T2, and T1 > T2. In this embodiment, the primary temperature Ta at the outlet of the engine 110 is the primary temperature Ta of the cooling fluid at the outlet of the engine 110.

[0138] Real-time detect the secondary temperature Tb at the outlet of the motor 210 and compare it with the set secondary temperature range of the motor set cooling circuit 200, where the secondary temperature range is T2 to T3, and T2 > T3. In this embodiment, the secondary temperature Tb at the outlet of the motor 210 is the secondary temperature Tb of the cooling fluid at the outlet of the motor 210.

[0139] The tertiary temperature Tc at the outlet of the battery 310 is detected in real time and compared with the set range of the tertiary temperature of the battery pack cooling circuit 300. The range of the tertiary temperature is T3 to T4, and T3 > T4. In this embodiment, the tertiary temperature Tc at the outlet of the battery 310 is the tertiary temperature Tc of the cooling fluid at the outlet of the battery 310.

[0140] The quaternary temperature Td at the outlet of the air conditioning device is detected in real time and compared with the set range of the quaternary temperature of the air conditioning device cooling circuit 400. The range of the quaternary temperature is T4 to T5, and T4 > T5. In this embodiment, the quaternary temperature Td at the outlet of the air conditioning device is the tertiary temperature Tc of the cooling fluid at the outlet of the condenser 420 (see the condenser 420 in Figure 1 ).

[0141] According to the above comparison results, the opening or closing of the primary switch 610, secondary switch 710, tertiary switch 810, and quaternary switch 910 is controlled respectively.

[0142] In this embodiment, by controlling the engine 110 cooling circuit within the range of the primary temperature T1 to T2, the motor cooling circuit 200 within the range of the secondary temperature T2 to T3, the battery pack cooling circuit 300 within the range of the tertiary temperature T3 to T4, and the air conditioning device cooling circuit 400 within the range of the quaternary temperature T4 to T5, and T1 > T2 > T3 > T4 > T5, the temperatures of the four cooling levels are gradually reduced. By detecting the primary temperature Ta, secondary temperature Tb, tertiary temperature Tc, and quaternary temperature Td in real time and comparing them with the corresponding temperature ranges, the opening or closing of the primary switch 610, secondary switch 710, tertiary switch 810, and quaternary switch 910 is controlled respectively, so as to realize the control and coordination among the four cooling levels of the engine cooling circuit 100, motor cooling circuit 200, battery pack cooling circuit 300, and air conditioning device cooling circuit 400. Through the cooperation between the heat exchanger 500 and each level of switch, the engine cooling circuit 100, motor cooling circuit 200, battery pack cooling circuit 300, and air conditioning device cooling circuit 400 are respectively controlled within a reasonable temperature range, and the heat is transferred step by step, meeting the heat exchange requirements of high-temperature heat dissipation and low-temperature heating in each cooling circuit, achieving the purpose of improving the thermal management efficiency of the thermal management system 10 of the hybrid vehicle and improving the overall vehicle energy utilization rate.

[0143] Furthermore, the steps of controlling the opening or closing of the primary switch 610, secondary switch 710, tertiary switch 810, and quaternary switch 910 respectively according to the above comparison results include:

[0144] When Ta > T1, the engine group cooling circuit 100 dissipates heat. Control the first-stage switch 610, second-stage switch 710, third-stage switch 810, and fourth-stage switch 910 to turn on. The engine group cooling circuit 100 transfers heat to the motor group cooling circuit 200, battery pack cooling circuit 300, and air-conditioning unit cooling circuit 400 through the heat exchanger 500. In this embodiment, when Ta > T1, the temperature of the engine group cooling circuit 100 is relatively high. Control the first-stage switch 610 to turn on, so that part of the cooling fluid flow passes through the first-stage heat exchange control branch 600 and flows through the heat exchanger 500. At the same time, control the second-stage switch 710, third-stage switch 810, and fourth-stage switch 910 to turn on step by step, so that part of the heat of the engine group cooling circuit 100 is transferred to the motor group cooling circuit 200, battery pack cooling circuit 300, and air-conditioning unit cooling circuit 400 for further cooling to meet the high-temperature heat dissipation requirements of the engine group cooling circuit 100.

[0145] When T2 ≤ Ta ≤ T1, control the first-stage switch 610 to be in the off state. In this embodiment, when Ta is within the first-stage temperature range T1 - T2, control the temperature of the engine group cooling circuit 100 through the engine group heat dissipation device to keep it within a reasonable temperature range.

[0146] When Ta < T2, the engine group cooling circuit 100 is heated, and it is judged whether Ta is less than Tb.

[0147] If so, control the first-stage switch 610 and second-stage switch 710 to turn on, and the motor group cooling circuit 200 transfers heat to the engine group cooling circuit 100 through the heat exchanger 500; if not, control the first-stage switch 610 and second-stage switch 710 to be in the off state. In this embodiment, when the hybrid vehicle is operating in a low-temperature environment or during cold start, during the cold start of the engine 110 and the transmission, the engine oil and transmission oil of the engine 110 have a low temperature and high viscosity, and the transmission efficiency is relatively low. If Ta < Tb during cold start, control the first-stage switch 610 and second-stage switch 710 to turn on, and the motor group cooling circuit 200 transfers heat to the engine group cooling circuit 100 through the heat exchanger 500 to accelerate the warm-up speed of the engine 110 and the transmission to meet the low-temperature heating requirements of the engine 110 cooling circuit.

[0148] In this embodiment, for the engine set cooling circuit 100, within the primary temperature range T1 to T2, according to the change of the primary temperature Ta, the engine set cooling circuit 100 operates accordingly. That is, when Ta > T1, T2 ≤ Ta ≤ T1, Ta < T2, correspondingly, the engine set cooling circuit 100 dissipates heat, the primary switch 610 is closed, and heating is performed. At the same time, according to actual requirements, the opening of the primary switch 610, secondary switch 710, tertiary switch 810, and quaternary switch 910 is controlled, so that heat exchange is performed between the engine set cooling circuit 100 and the motor set cooling circuit 200, battery set cooling circuit 300, and air conditioning unit cooling circuit 400 through the heat exchanger 500 to meet the high-temperature heat dissipation requirements and low-temperature heating requirements of the engine set cooling circuit 100.

[0149] Further, according to the above comparison results, the steps of respectively controlling the opening or closing of the primary switch 610, secondary switch 710, tertiary switch 810, and quaternary switch 910 further include:

[0150] When Tb > T2, the motor set cooling circuit 200 dissipates heat, the secondary switch 710, tertiary switch 810, and quaternary switch 910 are controlled to be opened, and the motor set cooling circuit 200 transfers heat to the battery set cooling circuit 300 and air conditioning unit cooling circuit 400 through the heat exchanger 500. In this embodiment, when Tb > T2, the temperature of the motor set cooling circuit 200 is relatively high. The secondary switch 710 is controlled to be opened so that part of the cooling fluid flow passes through the secondary heat exchange control branch 700 and flows through the heat exchanger 500. At the same time, the tertiary switch 810 and quaternary switch 910 are controlled to be opened step by step, so that part of the heat of the motor set cooling circuit 200 is transferred to the battery set cooling circuit 300 and air conditioning unit cooling circuit 400 for further cooling to meet the high-temperature heat dissipation requirements of the motor set cooling circuit 200.

[0151] When T3 ≤ Tb ≤ T2, the secondary switch 710 is controlled to be in the closed state. In this embodiment, when Tb is within the secondary temperature range T2 to T3, the temperature of the motor set cooling circuit 200 is controlled by the motor set heat dissipation device to be within a reasonable temperature range.

[0152] When Tb < T3, the motor set cooling circuit 200 is heated, the primary switch 610 is controlled to be opened, and the engine set cooling circuit 100 transfers heat to the motor set cooling circuit 200 through the heat exchanger 500 to meet the low-temperature heating requirements of the motor set cooling circuit 200.

[0153] In this embodiment, for the motor set cooling circuit 200, within the secondary temperature range T2 to T3, according to the change of the secondary temperature Tb, the motor set cooling circuit 200 operates accordingly. That is, when Tb > T2, T3 ≤ Tb ≤ T2, Tb < T3, correspondingly, the motor set cooling circuit 200 dissipates heat, the secondary switch 710 is closed, and heating is performed. At the same time, according to actual requirements, the opening of the primary switch 610, secondary switch 710, tertiary switch 810, and quaternary switch 910 is controlled, so that heat exchange is carried out between the motor set cooling circuit 200 and the engine set cooling circuit 100, battery pack cooling circuit 300, and air conditioning unit cooling circuit 400 through the heat exchanger 500 to meet the high-temperature heat dissipation requirements and low-temperature heating requirements of the motor set cooling circuit 200.

[0154] Further, according to the above comparison results, the steps of separately controlling the opening or closing of the primary switch 610, secondary switch 710, tertiary switch 810, and quaternary switch 910 further include:

[0155] When Tc > T3, the battery pack cooling circuit 300 dissipates heat, the tertiary switch 810 and quaternary switch 910 are controlled to open, and the battery pack cooling circuit 300 transfers heat to the air conditioning unit cooling circuit 400 through the heat exchanger 500, and it is judged whether Tc is greater than Tb.

[0156] If so, the secondary switch 710 is controlled to open, and the battery pack cooling circuit 300 transfers heat to the motor set cooling circuit 200 through the heat exchanger 500.

[0157] If not, the secondary switch 710 is controlled to close. In this embodiment, when Tc > T3, the temperature of the battery 310 is relatively high and needs to be cooled. The tertiary switch 810 is controlled to open, and at the same time, the quaternary switch 910 is controlled to open, so that the battery 310 is cooled by the air conditioning unit in the air conditioning unit cooling circuit 400 to meet the cooling requirements of the battery 310. If Tc > Tb, the secondary switch 710 is controlled to open, so that the heat in the battery pack cooling circuit 300 is transferred to the motor set cooling circuit 200 through the heat exchanger 500 for auxiliary heat dissipation. The high-temperature heat dissipation requirements of the battery pack cooling circuit 300 are met.

[0158] When T4 ≤ Tc ≤ T3, the tertiary switch 810 is controlled to be in the closed state.

[0159] When Tc < T4, the battery pack cooling circuit 300 is heated, and the first-stage switch 610, the second-stage switch 710, and the third-stage switch 810 are controlled to be turned on. The engine group cooling circuit 100 and the motor group cooling circuit 200 transfer heat to the battery pack cooling circuit 300 through the heat exchanger 500, so that the temperature of the battery 310 rises rapidly, improving the battery efficiency. When the temperature of the battery 310 reaches the reasonable range, that is, when Tc is within the three-stage temperature range T3 - T4, the first-stage switch 610, the second-stage switch 710, and the third-stage switch 810 are controlled to be turned off, and the heating of the battery 310 is stopped. The low-temperature heating requirement of the battery pack cooling circuit 300 is satisfied.

[0160] In this embodiment, for the battery pack cooling circuit 300, within the three-stage temperature range T3 - T4, according to the change of the three-stage temperature Tc, the battery pack cooling circuit 300 works accordingly. That is, when Tc > T3, T4 ≤ Tc ≤ T3, and Tc < T4, correspondingly, the battery pack cooling circuit 300 dissipates heat, the third-stage switch 810 is turned off, and heating is performed. At the same time, according to actual requirements, the first-stage switch 610, the second-stage switch 710, the third-stage switch 810, and the fourth-stage switch 910 are controlled to be turned on, so that heat exchange is performed between the battery pack cooling circuit 300 and the engine group cooling circuit 100, the motor group cooling circuit 200, and the air-conditioning unit cooling circuit 400 through the heat exchanger 500 to meet the high-temperature heat dissipation requirement and the low-temperature heating requirement of the battery pack cooling circuit 300.

[0161] Further, according to the above comparison results, the steps of respectively controlling the on or off of the first-stage switch 610, the second-stage switch 710, the third-stage switch 810, and the fourth-stage switch 910 further include:

[0162] The air-conditioning unit cooling circuit 400 is mainly used for the refrigeration requirement in the passenger compartment, and meets the battery cooling requirement of the battery pack cooling circuit 300 by turning on or off the third-stage switch 810 and the fourth-stage switch 910. In addition, after meeting the above requirements, the first-stage switch 610, the second-stage switch 710, the third-stage switch 810, and the fourth-stage switch 910 can be further controlled to be turned on or off in combination with the cooling requirements of the circuits 100 and 200 to achieve an integrated cooling control effect.

[0163] When T5 ≤ Td ≤ T4, the fourth-stage switch 910 is controlled to be in the off state.

[0164] When Td < T5, the air-conditioning unit cooling circuit 400 is heated. In the present embodiment, the four-stage switch 910 is controlled to be turned on. At the same time, according to the demand, the first-stage switch 610, the second-stage switch 710, and the third-stage switch 810 are controlled to be turned on, so that the excess heat in the engine set cooling circuit 100, the motor set cooling circuit 200, and the battery set cooling circuit 300 is transferred to the air-conditioning unit cooling circuit 400 through the heat exchanger 500, meeting the low-temperature heating demand of the air-conditioning unit cooling circuit 400.

[0165] In the present embodiment, for the air-conditioning unit cooling circuit 400, within the four-stage temperature range T4 - T5, according to the change of the four-stage temperature Td, the air-conditioning unit cooling circuit 400 operates accordingly. That is, when Td > T4, T5 ≤ Td ≤ T4, and Td < T5, correspondingly, the air-conditioning unit cooling circuit 400 dissipates heat, the four-stage switch 910 is turned off, and heating is performed. At the same time, according to the actual demand, the first-stage switch 610, the second-stage switch 710, the third-stage switch 810, and the four-stage switch 910 are controlled to be turned on, so that heat exchange is carried out between the air-conditioning unit cooling circuit 400 and the engine set cooling circuit 100, the motor set cooling circuit 200, and the battery set cooling circuit 300 through the heat exchanger 500 to meet the high-temperature heat dissipation demand and the low-temperature heating demand of the air-conditioning unit cooling circuit 400.

[0166] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A thermal management system for a hybrid vehicle, characterized in that, Comprising: An engine group cooling circuit, the engine group cooling circuit including an engine and an engine group heat dissipation device connected in series in sequence, the engine group heat dissipation device being used for dissipating heat from the engine; A motor group cooling circuit, the motor group cooling circuit including a motor and a motor group heat dissipation device connected in series in sequence, the motor group heat dissipation device being used for dissipating heat from the motor; A battery pack cooling circuit, the battery pack cooling circuit including a battery; An air conditioner cooling circuit, the air conditioner cooling circuit including an air conditioner; A heat exchanger, the heat exchanger being connected between the engine group cooling circuit, the motor group cooling circuit, the battery pack cooling circuit and the air conditioner cooling circuit; wherein, A first-stage heat exchange control branch provided with a first-stage switch is connected to the engine group cooling circuit, and the first-stage heat exchange control branch is connected to the heat exchanger to control the connection or disconnection between the engine group cooling circuit and the heat exchanger through the first-stage switch; A second-stage heat exchange control branch provided with a second-stage switch is connected to the motor group cooling circuit, and the second-stage heat exchange control branch is connected to the heat exchanger to control the connection or disconnection between the motor group cooling circuit and the heat exchanger through the second-stage switch; A third-stage heat exchange control branch provided with a third-stage switch is connected to the battery pack cooling circuit, and the third-stage heat exchange control branch is connected to the heat exchanger to control the connection or disconnection between the battery pack cooling circuit and the heat exchanger through the third-stage switch; A fourth-stage heat exchange control branch provided with a fourth-stage switch is connected to the air conditioner cooling circuit, and the fourth-stage heat exchange control branch is connected to the heat exchanger to control the connection or disconnection between the air conditioner cooling circuit and the heat exchanger through the fourth-stage switch; Wherein, the first-stage switch, the second-stage switch, the third-stage switch and the fourth-stage switch control heat exchange between the engine group cooling circuit, the motor group cooling circuit, the battery pack cooling circuit and the air conditioner cooling circuit through the heat exchanger.

2. The thermal management system of a hybrid vehicle according to claim 1, characterized in that, The engine group cooling circuit further includes: A first-stage water pump and a first-stage expansion water kettle, the first-stage water pump being connected in series between the engine and the engine group heat dissipation device, the first-stage expansion water kettle being connected in series with the first-stage water pump and the engine in sequence to provide a cooling fluid to the engine group cooling circuit; An exhaust gas recirculation cooling device, an engine oil cooling device, and a transmission oil cooling device, the exhaust gas recirculation cooling device, the engine oil cooling device, and the transmission oil cooling device being connected in parallel and all connected in series with the first-stage water pump and the engine, and the engine group heat dissipation device further being used for dissipating heat from the exhaust gas recirculation cooling device, the engine oil cooling device, and the transmission oil cooling device.

3. The thermal management system of a hybrid vehicle according to claim 2, characterized in that, The engine group heat dissipation device includes a thermostat and an engine group radiator connected in series in sequence, the thermostat being used for adjusting the flow rate of the cooling fluid flowing into the engine group radiator according to the temperature of the cooling fluid at the outlet of the engine; The transmission oil cooling device includes a transmission check valve and a transmission oil cooler connected in series in sequence. The cooling fluid in the engine group cooling circuit exchanges heat with the transmission oil cooler through the transmission check valve.

4. The thermal management system of a hybrid vehicle according to claim 1, characterized in that, The motor group cooling circuit further includes: A secondary water pump and a secondary expansion water tank. The secondary water pump and the secondary expansion water tank are connected in series, and both are connected to the motor in series. The secondary expansion water tank supplies cooling fluid to the motor group cooling circuit. An air-to-water intercooler, which is connected to the motor in parallel and is connected to the secondary water pump and the secondary expansion water tank in series. A heater core and a heater core check valve. The heater core and the heater core check valve are connected in series. The heater core and the heater core check valve are both connected to the secondary expansion water tank, the motor, and the air-to-water intercooler in series in sequence, and are connected to the motor group heat dissipation device in parallel. The cooling fluid in the motor group cooling circuit exchanges heat with the heater core through the heater core check valve.

5. The thermal management system of a hybrid vehicle according to claim 1, characterized in that, The battery pack cooling circuit further includes: A tertiary water pump and a tertiary expansion water tank. The tertiary water pump and the tertiary expansion water tank are connected in series, and both are connected to the battery in series. The tertiary expansion water tank supplies cooling fluid to the battery pack cooling circuit. A respiratory system heating water jacket and a heating water jacket check valve. The respiratory system heating water jacket and the heating water jacket check valve are connected in series. The respiratory system heating water jacket and the heating water jacket check valve are both connected to the tertiary expansion water tank, the tertiary water pump, and the battery in series in sequence. The cooling fluid in the battery pack cooling circuit exchanges heat with the respiratory system heating water jacket through the heating water jacket check valve.

6. The thermal management system of a hybrid vehicle according to claim 1, characterized in that, The air conditioning device includes: A compressor, a condenser, an expansion valve, and an evaporator connected in series in sequence.

7. A thermal management method for a hybrid vehicle, characterized in that, A thermal management system applicable to the hybrid vehicle as described in any one of claims 1 to 6. The thermal management method of the hybrid vehicle includes the following steps: Real-time detect the primary temperature Ta at the outlet of the engine and compare it with the set primary temperature range of the engine group cooling circuit, where the primary temperature range is T1 to T2, and T1 > T2. Real-time detect the secondary temperature Tb at the outlet of the motor and compare it with the set secondary temperature range of the motor group cooling circuit, where the secondary temperature range is T2 to T3, and T2 > T3. Real-time detect the tertiary temperature Tc at the outlet of the battery and compare it with the set tertiary temperature range of the battery pack cooling circuit, where the tertiary temperature range is T3 to T4, and T3 > T4. Real-time detect the quaternary temperature Td at the outlet of the air conditioning device and compare it with the set quaternary temperature range of the air conditioning device cooling circuit, where the quaternary temperature range is T4 to T5, and T4 > T5. According to the above comparison results, control the opening or closing of the first-level switch, second-level switch, third-level switch, and fourth-level switch respectively.

8. The thermal management method of a hybrid vehicle according to claim 7, characterized in that, The steps of controlling the opening or closing of the first-level switch, second-level switch, third-level switch, and fourth-level switch respectively according to the above comparison results include: When Ta > T1, the engine group cooling circuit dissipates heat, control the first-level switch, the second-level switch, the third-level switch, and the fourth-level switch to open, and the engine group cooling circuit transfers heat to the motor group cooling circuit, the battery pack cooling circuit, and the air conditioning unit cooling circuit through the heat exchanger; When T2 ≤ Ta ≤ T1, control the first-level switch to be in the closed state; When Ta < T2, the engine group cooling circuit is heated, and it is judged whether Ta is less than Tb; If so, control the first-level switch and the second-level switch to open, and the motor group cooling circuit transfers heat to the engine group cooling circuit through the heat exchanger; If not, control the first-level switch and the second-level switch to be in the closed state.

9. The thermal management method of a hybrid vehicle according to claim 7, characterized in that, The steps of controlling the opening or closing of the first-level switch, second-level switch, third-level switch, and fourth-level switch respectively according to the above comparison results further include: When Tb > T2, the motor group cooling circuit dissipates heat, control the second-level switch, the third-level switch, and the fourth-level switch to open, and the motor group cooling circuit transfers heat to the battery pack cooling circuit and the air conditioning unit cooling circuit through the heat exchanger; When T3 ≤ Tb ≤ T2, control the second-level switch to be in the closed state; When Tb < T3, the motor group cooling circuit is heated, control the first-level switch to open, and the engine group cooling circuit transfers heat to the motor group cooling circuit through the heat exchanger.

10. The thermal management method for a hybrid vehicle according to claim 7, characterized in that, The steps of controlling the opening or closing of the first-level switch, second-level switch, third-level switch, and fourth-level switch respectively according to the above comparison results further include: When Tc > T3, the battery pack cooling circuit dissipates heat, control the third-level switch and the fourth-level switch to open, the battery pack cooling circuit transfers heat to the air conditioning unit cooling circuit through the heat exchanger, and it is judged whether Tc is greater than Tb; If so, control the second-level switch to open, and the battery pack cooling circuit transfers heat to the motor group cooling circuit through the heat exchanger; If not, control the second-level switch to close; When T4 ≤ Tc ≤ T3, control the third-level switch to be in the closed state; When Tc < T4, the battery pack cooling circuit is heated, control the first-level switch, the second-level switch, and the third-level switch to open, and the engine group cooling circuit and the motor group cooling circuit transfer heat to the battery pack cooling circuit through the heat exchanger.

11. The thermal management method of a hybrid vehicle according to claim 7, characterized in that, The steps of controlling the opening or closing of the first-level switch, second-level switch, third-level switch, and fourth-level switch respectively according to the above comparison results further include: When Td > T4, the air conditioning unit cooling circuit dissipates heat; When T5 ≤ Td ≤ T4, control the fourth-level switch to be in the closed state; When Td < T5, the air conditioning unit cooling circuit is heated.

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