Electric vehicle low-temperature heat management method and system and vehicle

Abstract

The invention discloses an electric vehicle low-temperature heat management method and system and a vehicle, and relates to the technical field of electric vehicles. The method comprises the steps that the temperature of the environment where a vehicle is located and the working state of a vehicle air conditioner are obtained; in response to the fact that the vehicle air conditioner is in the starting state and the environment temperature is larger than a first temperature threshold value, low-temperature heat management is conducted on the vehicle based on a first control strategy, and the first control strategy is used for conducting low-temperature heat management on the vehicle when the heat pump system is in the operation working condition; and in response to the situation that the vehicle air conditioner is in the closed state or the environment temperature is smaller than a second temperature threshold value, low-temperature heat management is conducted on the vehicle based on a second control strategy, and the second control strategy is used for conducting low-temperature heat management on the vehicle when the heat pump system is not in the operation working condition. According to the invention, the technical problem of high energy consumption of the electric vehicle in a low-temperature state in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric vehicles, in particular to an electric vehicle low-temperature thermal management method, system and vehicle. BACKGROUND

[0002] In the technical field of electric vehicles, thermal management technology is crucial for improving vehicle performance and energy efficiency, especially in low-temperature environments. Traditional thermal management strategies usually rely on heat pump air conditioning systems to absorb heat from the outside air, but this method is inefficient in low-temperature conditions because the heat pump's heating capacity decreases significantly due to the low outside air temperature, resulting in increased energy consumption. With increasing emphasis on energy saving and emission reduction and improving energy utilization efficiency, how to further reduce the overall energy consumption of the vehicle has become a problem in the design of thermal management systems.

[0003] There is no effective solution to the above technical problems. SUMMARY

[0004] The embodiments of the present application provide an electric vehicle low-temperature thermal management method, system and vehicle to at least solve the technical problem of high energy consumption of electric vehicles in low-temperature conditions in related technologies.

[0005] According to one embodiment of the present application, an electric vehicle low-temperature thermal management method is provided, comprising: obtaining an ambient temperature of a vehicle and a working state of a vehicle air conditioner; in response to the vehicle air conditioner being in an open state and the ambient temperature being greater than a first temperature threshold, performing low-temperature thermal management on the vehicle based on a first control strategy, wherein the first control strategy is used to perform low-temperature thermal management on the vehicle when a heat pump system is in a running condition; in response to the vehicle air conditioner being in a closed state or the ambient temperature being less than a second temperature threshold, performing low-temperature thermal management on the vehicle based on a second control strategy, wherein the second control strategy is used to perform low-temperature thermal management on the vehicle when the heat pump system is not in a running condition.

[0006] Optionally, the first control strategy includes a third control strategy and a fourth control strategy, the third control strategy is used to perform low-temperature thermal management on the vehicle when the discharging capacity of the power battery is greater than or equal to a preset threshold, and the fourth control strategy is used to perform low-temperature thermal management on the vehicle when the discharging capacity of the power battery is less than the preset threshold, performing low-temperature thermal management on the vehicle based on the first control strategy includes: obtaining a peak discharging power of the power battery; in response to the peak discharging power being greater than a first power threshold, performing low-temperature thermal management on the vehicle based on the third control strategy; and in response to the peak discharging power being less than or equal to a second power threshold, performing low-temperature thermal management on the vehicle based on the fourth control strategy.

[0007] Optionally, the second control strategy comprises a fifth control strategy and a sixth control strategy, the fifth control strategy being used for low-temperature thermal management of the vehicle when the discharge capability of the power battery is greater than or equal to a preset threshold, and the sixth control strategy being used for low-temperature thermal management of the vehicle when the discharge capability of the power battery is less than the preset threshold, the low-temperature thermal management of the vehicle based on the second control strategy comprising: acquiring a peak discharge power of the power battery; in response to the peak discharge power being greater than a third power threshold, performing the low-temperature thermal management of the vehicle based on the fifth control strategy; and in response to the peak discharge power being less than or equal to a fourth power threshold, performing the low-temperature thermal management of the vehicle based on the sixth control strategy.

[0008] Optionally, the low-temperature thermal management of the vehicle based on the third control strategy comprises: acquiring a motor system cooling water temperature and a reducer oil circuit oil temperature; in response to the motor system cooling water temperature being greater than or equal to a sum of an ambient temperature and a first numerical value, controlling the vehicle air conditioner cooler to absorb heat from the motor system; in response to the motor system cooling water temperature being less than or equal to the ambient temperature, controlling the vehicle air conditioner cooler to absorb heat from an air source; in response to the reducer oil circuit oil temperature being greater than or equal to a sum of the motor system cooling water temperature and a second numerical value, adjusting a working state of the first four-way valve to connect heat exchange between the reducer and the motor system; in response to the reducer oil circuit oil temperature being less than the motor system cooling water temperature, adjusting the working state of the first four-way valve to block the heat exchange between the reducer and the motor system; and adjusting the working state of the first four-way valve to block heat exchange between the reducer and the power battery.

[0009] Optionally, the low-temperature thermal management of the vehicle based on the fourth control strategy comprises: acquiring a motor system cooling water temperature; in response to the motor system cooling water temperature being greater than or equal to a sum of an ambient temperature and a first numerical value, controlling the vehicle air conditioner cooler to absorb heat from the motor system; in response to the motor system cooling water temperature being less than or equal to the ambient temperature, controlling the vehicle air conditioner cooler to absorb heat from an air source; and adjusting a working state of the first four-way valve and a working state of the second four-way valve to block heat exchange between the reducer and the motor system and to connect heat exchange between the reducer and the power battery.

[0010] Optionally, the low-temperature thermal management of the vehicle is performed based on a fifth control strategy, including: obtaining the motor system cooling water temperature, the reducer oil circuit oil temperature, and the power battery cooling water temperature; in response to the motor system cooling water temperature being greater than or equal to the sum of the reducer oil circuit oil temperature and a second value, adjusting the working state of the first four-way valve to connect the heat exchange between the reducer and the motor system; in response to the motor system cooling water temperature being less than the reducer oil circuit oil temperature, adjusting the working state of the first four-way valve to block the heat exchange between the reducer and the motor system; in response to the power battery cooling water temperature being less than the reducer oil circuit oil temperature, adjusting the working state of the first four-way valve and the working state of the second four-way valve to block the heat exchange between the reducer and the power battery; and in response to the power battery cooling water temperature being greater than or equal to the sum of the reducer oil circuit oil temperature and a third value, adjusting the working state of the first four-way valve and the working state of the second four-way valve to connect the heat exchange between the reducer and the power battery.

[0011] Optionally, the low-temperature thermal management of the vehicle is performed based on a sixth control strategy, including: obtaining the motor system cooling water temperature, the reducer oil circuit oil temperature, and the power battery cooling water temperature; in response to the motor system cooling water temperature being greater than or equal to the sum of the reducer oil circuit oil temperature and a second value, adjusting the working state of the first four-way valve to connect the heat exchange between the reducer and the motor system; in response to the motor system cooling water temperature being less than the reducer oil circuit oil temperature, adjusting the working state of the first four-way valve to block the heat exchange between the reducer and the motor system; in response to the reducer oil circuit oil temperature being greater than the sum of the power battery cooling water temperature and a fourth value, adjusting the working state of the first four-way valve and the working state of the second four-way valve to connect the heat exchange between the reducer and the power battery; and in response to the reducer oil circuit oil temperature being less than or equal to the power battery cooling water temperature, adjusting the working state of the first four-way valve and the working state of the second four-way valve to block the heat exchange between the reducer and the power battery.

[0012] Optionally, the low-temperature thermal management method of the electric vehicle further includes: obtaining the driving mode of the vehicle; in response to the driving mode being a two-wheel drive mode, adjusting the working state of the three-way valve to block the heat exchange between the front electric drive system and the rear electric drive system; and adjusting the working state of the second four-way valve to block the heat exchange between the first reducer and the second reducer, wherein the first reducer and the second reducer are both internal components of the vehicle.

[0013] According to an embodiment of the present application, a low-temperature thermal management system for an electric vehicle is provided for performing the low-temperature thermal management method of the electric vehicle in any of the above embodiments, including: an air conditioning system circuit, a motor system circuit, a reducer system circuit, and a power battery system circuit.

[0014] According to one of the embodiments of the present application, there is also provided an electric vehicle low-temperature thermal management device, comprising: an acquisition module, configured to acquire an ambient temperature where the vehicle is located and a working state of a vehicle air conditioner; a first management module, configured to, in response to the vehicle air conditioner being in an open state and the ambient temperature being greater than a first temperature threshold, perform low-temperature thermal management on the vehicle based on a first control strategy, wherein the first control strategy is used to perform low-temperature thermal management on the vehicle when a heat pump system is in a running working condition; and a second management module, configured to, in response to the vehicle air conditioner being in a closed state or the ambient temperature being less than a second temperature threshold, perform low-temperature thermal management on the vehicle based on a second control strategy, wherein the second control strategy is used to perform low-temperature thermal management on the vehicle when the heat pump system is not in the running working condition.

[0015] According to one of the embodiments of the present application, there is also provided a vehicle, comprising: a memory, storing an executable program; and a processor, configured to run the program, wherein the program performs the electric vehicle low-temperature thermal management method in any of the above embodiments when running.

[0016] According to one of the embodiments of the present application, there is also provided a computer readable storage medium, storing a computer program, wherein the computer program is configured to perform the electric vehicle low-temperature thermal management method in any of the above embodiments when running on a computer or a processor.

[0017] According to one of the embodiments of the present application, there is also provided an electronic device, comprising a memory and a processor, the memory storing a computer program, and the processor being configured to run the computer program to perform the electric vehicle low-temperature thermal management method in any of the above embodiments.

[0018] According to one of the embodiments of the present application, there is also provided a computer program product, comprising a computer program, which, when executed by a processor, implements the electric vehicle low-temperature thermal management method in any of the above embodiments.

[0019] In the embodiments of the present application, by acquiring an ambient temperature where the vehicle is located and a working state of a vehicle air conditioner, in response to the vehicle air conditioner being in an open state and the ambient temperature being greater than a first temperature threshold, performing low-temperature thermal management on the vehicle based on a first control strategy, wherein the first control strategy is used to perform low-temperature thermal management on the vehicle when a heat pump system is in a running working condition, in response to the vehicle air conditioner being in a closed state or the ambient temperature being less than a second temperature threshold, performing low-temperature thermal management on the vehicle based on a second control strategy, wherein the second control strategy is used to perform low-temperature thermal management on the vehicle when the heat pump system is not in the running working condition, the purpose of optimizing energy utilization of a heat pump air conditioning system and improving energy efficiency of an electric vehicle in a low-temperature environment is achieved, thereby realizing the technical effects of reducing overall energy consumption of the vehicle and enhancing vehicle power performance and battery discharge capacity in a low-temperature working condition, and further solving the technical problem of high energy consumption of the electric vehicle in a low-temperature state in the related art. Attached Figure Description

[0020] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0021] Figure 1 This is a flowchart of a low-temperature thermal management method for electric vehicles according to one embodiment of the present invention;

[0022] Figure 2 This is a structural diagram of an electric vehicle low-temperature thermal management system according to one embodiment of the present invention;

[0023] Figure 3 This is a structural block diagram of a low-temperature thermal management device for electric vehicles according to one embodiment of the present invention. Detailed Implementation

[0024] For ease of understanding, some concepts related to embodiments of the present invention are illustrated below for reference.

[0025] Heat pump system: A heat pump is a device that can extract heat energy from a low-temperature heat source and transfer that heat to a high-temperature heat source while consuming a certain amount of external work. In the thermal management system of electric vehicles, the heat pump system can be used for heating and can raise the temperature of the passenger compartment or battery pack in a more energy-efficient way.

[0026] Water-cooled electric drive system: A water-cooled electric drive system is a system that uses a fluid (usually water) as a cooling medium to cool the motor and inverter in order to keep these components operating within a high-efficiency range.

[0027] Oil-cooled reducers: Oil-cooled reducers use lubricating oil as the cooling medium. The circulating oil carries away the heat generated inside the reducer, maintaining it within a suitable operating temperature range. In low-temperature environments, the oil viscosity increases and its fluidity decreases, which affects the reducer's efficiency and performance. Therefore, managing the oil temperature is crucial for maintaining the reducer's optimal operating condition.

[0028] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0029] It is to be understood that the terms "first", "second", and the like, used in the description and the claims of the application as well as the above description of the drawings merely specify a certain order, and cannot be understood as implying a specific order or chronology. It is to be understood that the data thus used can be interchanged, where appropriate, so that the embodiments of the application described herein can be carried out in a different order than the one illustrated or described herein. In the description of the embodiments, the term "a plurality" means two or more, unless otherwise specified. Furthermore, the terms "comprise" and "have", as well as any variations thereof, are intended to cover non-exclusive inclusions, for example, a process, method, system, product, or apparatus that comprises a list of steps or units is not necessarily limited to those steps or units that are clearly listed, but can include other steps or units that are not clearly listed or inherent to such a process, method, product, or apparatus.

[0030] According to an embodiment of the application, an embodiment of a method for low temperature thermal management of an electric vehicle is provided. It is to be understood that the steps illustrated in the flowcharts of the drawings can be performed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowcharts, in some cases, the steps shown or described can be performed in an order different from that shown.

[0031] The method embodiment can be executed in an electronic device comprising a memory and a processor, a similar control device or system. Taking the electronic device as an example, the electronic device can comprise one or more processors and a memory for storing data. Optionally, the electronic device can further comprise a communication device for communication function and a display device. Those skilled in the art can understand that the above structural description is merely illustrative, and does not limit the structure of the electronic device. For example, the electronic device can comprise more or less components than the above structural description, or have a different configuration from the above structural description.

[0032] The processor can include one or more processing units. For example, the processor can include a central processing unit (CPU), a graphics processing unit (GPU), a digital signal processing (DSP) chip, a microcontroller unit (MCU), a field-programmable gate array (FPGA), a neural-network processing unit (NPU), a tensor processing unit (TPU), an artificial intelligent (AI) type processor, or the like. Different processing units can be independent components or integrated in one or more processors. In some examples, the electronic device can also include one or more processors.

[0033] The memory can be used to store a computer program, for example, a computer program corresponding to the low-temperature thermal management method of the electric vehicle in the embodiments of the present application. The processor realizes the above-mentioned low-temperature thermal management method of the electric vehicle by running the computer program stored in the memory. The memory can include a high-speed random access memory, and can also include a non-volatile memory, such as one or more magnetic storage devices, flash memories, or other non-volatile solid-state memories. In some examples, the memory can further include a memory remotely arranged with respect to the processor, and these remote memories can be connected to the electronic device through a network. Examples of the above-mentioned network include but are not limited to the Internet, an intranet, a local area network, a mobile communication network, and a combination thereof.

[0034] The communication device is used to receive or send data via a network. Specific examples of the above-mentioned network can include a wireless network provided by a communication provider of a mobile terminal. In one example, the communication device includes a network interface controller (NIC) which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the communication device can be a radio frequency (RF) module which is used to communicate with the Internet in a wireless manner.

[0035] The display device can be, for example, a liquid crystal display (LCD) and a touch display (also referred to as a "touch screen" or "touch display screen") in the form of a touch screen. The liquid crystal display can enable a user to interact with a user interface of the mobile terminal. In some embodiments, the mobile terminal described above has a graphical user interface (GUI), with which a user can interact with the GUI by finger contact and / or gestures on the touch-sensitive surface, where the human-machine interaction function can optionally include the following interactions: creating web pages, drawing, word processing, making electronic documents, games, video conferencing, instant messaging, sending and receiving e-mails, call interface, playing digital videos, playing digital music, and / or web browsing, etc., executable instructions for performing the above human-machine interaction functions are configured / stored in one or more computer program products or readable storage media executable by the processor.

[0036] In the present embodiment, a low-temperature thermal management method for an electric vehicle running on an electronic device is provided, Figure 1 is a flowchart of the low-temperature thermal management method for an electric vehicle according to an embodiment of the present application, as Figure 1 shown, the flow includes the following steps:

[0037] Step S10, obtaining the ambient temperature where the vehicle is located and the working state of the vehicle air conditioner;

[0038] In the embodiment of the present application, the ambient temperature refers to the air temperature of the external surrounding environment of the vehicle, which is measured by the temperature sensor installed on the vehicle. For example, the ambient temperature can be represented as T ambi .

[0039] The working state of the vehicle air conditioner refers to whether the vehicle air conditioning system is currently started.

[0040] As can be seen, by obtaining the ambient temperature where the vehicle is located and the working state of the vehicle air conditioner, the present application optimizes energy utilization, and ensures that the vehicle can run in the most efficient way under different ambient temperature and air conditioner use scenarios.

[0041] Step S12, in response to the vehicle air conditioner being in an open state and the ambient temperature being greater than a first temperature threshold, performing low-temperature thermal management on the vehicle based on a first control strategy, wherein the first control strategy is used to perform low-temperature thermal management on the vehicle when the heat pump system is in a running working condition;

[0042] In the embodiment of the present application, the first temperature threshold can be set to T cali + ΔT, wherein T cali may be -20℃, and ΔT can be 3℃, which is not limited here.

[0043] The first control strategy is that in the case that the heat pump system works, the heat pump absorbs heat from the motor loop system, thereby reducing the energy consumption of the heat pump, and according to different working condition scenes, the distribution strategy of the motor waste heat and the battery waste heat among the heat pump, the motor and the battery is considered, on the one hand, the power consumption of the whole vehicle is reduced, and on the other hand, the discharge power capability of the battery at low temperature is considered, and the low-temperature power performance of the whole vehicle is ensured.

[0044] In response to the vehicle air conditioner being in the open state and the environment temperature being greater than the first temperature threshold, the low-temperature thermal management of the vehicle based on the first control strategy can be understood as that when the driver opens the vehicle air conditioner and the environment temperature is higher than the first temperature threshold T cali +ΔT, the first control strategy is adopted for the low-temperature thermal management of the vehicle.

[0045] It can be seen that when the vehicle air conditioner is in the open state and the environment temperature is greater than the first temperature threshold, the first control strategy can realize the intelligent thermal energy management of the thermal management system of the electric vehicle in the low-temperature environment, not only effectively reduces the air conditioning energy consumption and improves the performance of the battery and the reducer, but also avoids the unnecessary waste of thermal energy and enhances the overall energy efficiency of the vehicle under the low-temperature condition.

[0046] Step S14, in response to the vehicle air conditioner being in the closed state or the environment temperature being less than the second temperature threshold, the low-temperature thermal management of the vehicle based on the second control strategy, wherein the second control strategy is used for the low-temperature thermal management of the vehicle in the case that the heat pump system is not in the running working condition.

[0047] In the embodiment of the application, the second temperature threshold can be set to T cali , wherein T cali may be minus 20℃, which is not limited here.

[0048] The second control strategy is that in the case that the heat pump system does not work and when the environment temperature is lower than a certain value, the positive temperature coefficient thermistor (PTC) works, so in this case, the air conditioner cooler does not work and does not need to absorb heat from the motor loop system. The second control strategy mainly considers how to distribute the waste heat of the motor and the battery in different working condition scenes, on the one hand, the low-temperature efficiency of the reducer is ensured, the low-temperature power consumption of the whole vehicle is reduced, and on the other hand, the low-temperature discharge power capability of the battery is ensured, and the low-temperature power performance of the whole vehicle is ensured.

[0049] In response to the vehicle air conditioner being in the closed state or the environment temperature being less than the second temperature threshold, the low-temperature thermal management of the vehicle based on the second control strategy can be understood as that when the driver closes the air conditioner or the environment temperature is lower than a certain value, the second control strategy is adopted for the low-temperature thermal management of the vehicle. cali ​

[0050] It can be seen that the second control strategy, in the case that the heat pump system does not work, through intelligent management and distribution of heat between various thermal management systems in the vehicle interior, saves energy and optimizes the performance of the battery and the retarder in a low-temperature environment.

[0051] Based on the above steps, by acquiring the ambient temperature of the vehicle and the working state of the vehicle air conditioner; in response to the vehicle air conditioner being in an open state and the ambient temperature being greater than a first temperature threshold, performing low-temperature thermal management on the vehicle based on a first control strategy, wherein the first control strategy is used to perform low-temperature thermal management on the vehicle in the case that the heat pump system is in a running working condition; in response to the vehicle air conditioner being in a closed state or the ambient temperature being less than a second temperature threshold, performing low-temperature thermal management on the vehicle based on a second control strategy, wherein the second control strategy is used to perform low-temperature thermal management on the vehicle in the case that the heat pump system is not in a running working condition, the purpose of optimizing the energy utilization of the heat pump air conditioning system and improving the energy efficiency of the electric vehicle in a low-temperature environment is achieved, thereby realizing the technical effects of reducing the overall energy consumption of the vehicle and enhancing the power performance and battery discharge capacity of the vehicle in a low-temperature working condition, and further solving the technical problem of high energy consumption of the electric vehicle in a low-temperature state in the related art.

[0052] Optionally, the first control strategy includes a third control strategy and a fourth control strategy, the third control strategy is used to perform low-temperature thermal management on the vehicle when the discharge capacity of the power battery is greater than or equal to a preset threshold, and the fourth control strategy is used to perform low-temperature thermal management on the vehicle when the discharge capacity of the power battery is less than the preset threshold, and in step S12, performing low-temperature thermal management on the vehicle based on the first control strategy can include the following execution steps:

[0053] Step S121, acquiring the peak discharge power of the power battery;

[0054] Step S122, in response to the peak discharge power being greater than a first power threshold, performing low-temperature thermal management on the vehicle based on the third control strategy;

[0055] Step S123, in response to the peak discharge power being less than or equal to a second power threshold, performing low-temperature thermal management on the vehicle based on the fourth control strategy.

[0056] In the embodiment of the application, the peak discharge power is the maximum instantaneous discharge power that the power battery can provide, and exemplarily, the peak discharge power can be represented as P peak .

[0057] The first power threshold can be represented as P cali1 + ΔP1, wherein P cali1 The numerical value is related to the vehicle model, for example, when the vehicle mass m = 1800 kg, P cali1 may be 100 kW, and ΔP1 may be 10 kW, which is not limited here.

[0058] The second power threshold can be represented as P cali1 , P cali1 may be 100kW, which is not limited herein.

[0059] In response to the peak discharge power being greater than the first power threshold, the low-temperature thermal management of the vehicle based on the third control strategy can be understood as that when the peak discharge power P peak of the power battery is greater than P cali1 + ΔP1, the third control strategy is adopted for the low-temperature thermal management of the vehicle.

[0060] In response to the peak discharge power being less than or equal to the second power threshold, the low-temperature thermal management of the vehicle based on the fourth control strategy can be understood as that when the peak discharge power P peak of the power battery is less than or equal to P cali1 , the fourth control strategy is adopted for the low-temperature thermal management of the vehicle.

[0061] It can be seen that when the peak discharge power of the battery is higher than the first power threshold, the thermal management system operates according to the third control strategy, which can avoid unnecessary energy consumption, and when the peak discharge power of the battery is less than or equal to the second power threshold, the thermal management system operates according to the fourth control strategy, which focuses on improving the temperature of the power battery, thereby realizing efficient use of energy and improvement of system performance, and at the same time ensuring the driving experience and safety of the vehicle in a low-temperature environment.

[0062] Optionally, the second control strategy includes a fifth control strategy and a sixth control strategy, the fifth control strategy is used for the low-temperature thermal management of the vehicle when the discharge capacity of the power battery is greater than or equal to a preset threshold, and the sixth control strategy is used for the low-temperature thermal management of the vehicle when the discharge capacity of the power battery is less than the preset threshold, and in step S14, the low-temperature thermal management of the vehicle based on the second control strategy can include the following execution steps:

[0063] Step S141, acquiring the peak discharge power of the power battery;

[0064] Step S142, in response to the peak discharge power being greater than a third power threshold, the low-temperature thermal management of the vehicle based on the fifth control strategy;

[0065] Step S143, in response to the peak discharge power being less than or equal to a fourth power threshold, the low-temperature thermal management of the vehicle based on the sixth control strategy.

[0066] In the embodiment of the application, the third power threshold can be represented as P cali2 + ΔP2, wherein P cali2 is a value related to the vehicle type, for example, when the mass m of the vehicle is 1800kg, P cali2The 100 kW can be taken, and the 10 kW can be taken, which is not limited here.

[0067] The fourth power threshold can be represented as P cali2 , P cali2 The 100 kW can be taken, which is not limited here.

[0068] In response to the peak discharge power being greater than the third power threshold, the low-temperature thermal management of the vehicle based on the fifth control strategy can be understood as when the peak discharge power P peak of the power battery is greater than P cali2 + ΔP2, the low-temperature thermal management of the vehicle is adopted based on the fifth control strategy.

[0069] In response to the peak discharge power being less than or equal to the fourth power threshold, the low-temperature thermal management of the vehicle based on the sixth control strategy can be understood as when the peak discharge power P peak of the power battery is less than or equal to P cali2 , the low-temperature thermal management of the vehicle is adopted based on the sixth control strategy.

[0070] It can be seen that through the above steps, the performance of the battery and the reducer is improved, the energy consumption is reduced, the driving experience and vehicle safety are enhanced, and the flexibility of the thermal management system and the adaptability to complex environments are embodied. The electric vehicle can improve the performance of the battery and the reducer, reduce the energy consumption, enhance the driving experience and vehicle safety, and reflect the flexibility of the thermal management system and the adaptability to complex environments.

[0071] Optionally, in step S122, the low-temperature thermal management of the vehicle based on the third control strategy can include the following execution steps:

[0072] Step S1221, acquiring the motor system cooling water temperature and the reducer oil circuit oil temperature;

[0073] Step S1222, in response to the motor system cooling water temperature being greater than or equal to the sum of the ambient temperature and the first value, controlling the vehicle air conditioner cooler to absorb heat from the motor system;

[0074] Step S1223, in response to the motor system cooling water temperature being less than or equal to the ambient temperature, controlling the vehicle air conditioner cooler to absorb heat from the air source;

[0075] Step S1224, in response to the reducer oil circuit oil temperature being greater than or equal to the sum of the motor system cooling water temperature and the second value, adjusting the working state of the first four-way valve to connect the heat exchange between the reducer and the motor system;

[0076] Step S1225, in response to the reducer oil circuit oil temperature being less than the motor system cooling water temperature, adjusting the working state of the first four-way valve to block the heat exchange between the reducer and the motor system;

[0077] Step S1226, adjust the working state of the first four-way valve to block the heat exchange between the reducer and the power battery.

[0078] In the embodiment of the present application, the motor system cooling water temperature is the water temperature in the cooling loop where the motor and the inverter are located, which reflects the thermal state of the motor system under the current working condition. Exemplarily, the motor system cooling water temperature can be represented as T_motor_water, which is not limited herein.

[0079] The reducer oil circuit oil temperature refers to the temperature of the oil in the reducer cooling oil circuit. Especially in a low temperature environment, the reducer oil circuit oil temperature has a significant impact on its transmission efficiency. Higher oil temperature can reduce oil viscosity, improve reducer efficiency, and reduce energy loss. Exemplarily, the reducer oil circuit oil temperature can be represented as T_reducer_oil, which is not limited herein.

[0080] The first value is a preset temperature difference value, which is used to determine whether the motor system cooling water temperature is high enough relative to the ambient temperature, so as to determine whether the heat pump system should preferentially absorb heat from the motor system rather than from the outside air. Exemplarily, the selection of the first value ΔT1 needs to consider the actual heat generation of the motor system and the heat absorption efficiency of the air conditioning system, and it is usually a positive number, such as 10°C, which is not limited herein.

[0081] The second value is another preset temperature difference value, which is used to evaluate the relationship between the reducer oil temperature and the motor system cooling water temperature. The second value ΔT2 is also calibrated according to the system characteristics and heat exchange efficiency, for example, 5°C, which is not limited herein.

[0082] In response to the motor system cooling water temperature being greater than or equal to the sum of the ambient temperature and the first value, controlling the vehicle air conditioning cooler to absorb heat from the motor system can be understood as follows: if T_motor_water is greater than or equal to Tambi+ΔT1, it means that the motor system water temperature is high, and it is more energy-efficient for the air conditioning cooler to absorb heat from the motor cooling water. At this time, the air conditioning cooler absorbs heat from the motor system, not from the air source.

[0083] In response to the motor system cooling water temperature being less than or equal to the ambient temperature, controlling the vehicle air conditioning cooler to absorb heat from the air source can be understood as follows: if T_motor_water is less than or equal to Tambi, the air conditioning cooler is exited from absorbing heat from the motor system and switched to absorbing heat from the air source.

[0084] In response to the reducer oil temperature being greater than or equal to the sum of the motor system cooling water temperature and the second value, the working state of the first four-way valve is adjusted to communicate heat exchange between the reducer and the motor system. It can be understood that if T_reducer_oil is greater than or equal to T_motor_water + ΔT2, the 1 port of the first four-way valve (i.e., four-way valve 1) is opened and the 2 port is closed, the reducer cooling oil flows through the heat exchanger 1, and the heat exchange is performed with the motor cooling water circuit to warm up the motor cooling water circuit.

[0085] In response to the reducer oil temperature being less than the motor system cooling water temperature, the working state of the first four-way valve is adjusted to block heat exchange between the reducer and the motor system. It can be understood that if T_reducer_oil is less than T_motor_water, the 1 port of the first four-way valve is closed and the 2 port is opened, the reducer cooling oil does not flow through the heat exchanger 1, and the reducer cooling oil circuit does not perform heat exchange with the motor cooling water circuit.

[0086] Adjusting the working state of the first four-way valve to block heat exchange between the reducer and the power battery can be understood as that because the battery discharge capacity is sufficient, the effect of heating the battery is not obvious, at this time the 4 port of the first four-way valve is closed, the 4 port of the second four-way valve (i.e., four-way valve 2) is also closed, the reducer cooling oil does not flow through the heat exchanger 2, and the heat of the reducer does not exchange with the power battery. The heat is left for the reducer itself or for the motor cooling system for the heat pump, which can reduce the energy consumption of the air conditioning system and improve the reducer oil temperature to improve the efficiency of the reducer.

[0087] It can be seen that through the above steps, first, the system realizes accurate selection of the heat source of the vehicle air conditioner cooler by real-time monitoring of the motor system cooling water temperature and the reducer oil temperature, combining the ambient temperature and the first value and the second value, that is, when the motor system water temperature is suitable, the motor waste heat is used for heating, and when the water temperature is lower than the ambient temperature, the energy is not wasted, and the heat is absorbed from the air source. This strategy effectively reduces the energy consumption of the air conditioner. Secondly, the mechanism can intelligently control the heat exchange between the reducer and the motor system. When the reducer oil temperature is relatively high, the heat transfer between the two systems is promoted through the adjustment of the first four-way valve, and the waste heat of the reducer is used to improve the temperature of the motor system. Conversely, the heat exchange is cut off to prevent unnecessary consumption of heat. Finally, by blocking the heat exchange between the reducer and the power battery, the system avoids excessive heating when the battery discharge capacity is sufficient, thereby saving energy and protecting the battery health.

[0088] Optionally, in step S123, the low-temperature thermal management of the vehicle based on the fourth control strategy can include the following execution steps:

[0089] In step S1231, the motor system cooling water temperature is obtained.

[0090] Step S1232, in response to the motor system cooling water temperature being greater than or equal to the sum of the ambient temperature and the first value, controlling the vehicle air conditioner cooler to absorb heat from the motor system;

[0091] Step S1233, in response to the motor system cooling water temperature being less than or equal to the ambient temperature, controlling the vehicle air conditioner cooler to absorb heat from the air source;

[0092] Step S1234, adjusting the working state of the first four-way valve and the working state of the second four-way valve to block heat exchange between the reducer and the motor system and to connect heat exchange between the reducer and the power battery.

[0093] In the embodiment of the present application, in response to the motor system cooling water temperature being greater than or equal to the sum of the ambient temperature and the first value, controlling the vehicle air conditioner cooler to absorb heat from the motor system can be understood as follows: if T_motor_water is greater than or equal to Tambi+ΔT1, it indicates that the motor system water temperature is high, and it is more energy-saving for the air conditioner cooler to absorb heat from the motor cooling water, so at this time the air conditioner cooler is controlled to absorb heat from the motor system and not from the air source.

[0094] In response to the motor system cooling water temperature being less than or equal to the ambient temperature, controlling the vehicle air conditioner cooler to absorb heat from the air source can be understood as follows: if T_motor_water is less than or equal to Tambi, the air conditioner cooler is exited from absorbing heat from the motor system and is switched to absorbing heat from the air source.

[0095] Adjusting the working state of the first four-way valve and the working state of the second four-way valve to block heat exchange between the reducer and the motor system and to connect heat exchange between the reducer and the power battery can be understood as follows: the 1 port of the first four-way valve is closed and the 2 port is opened, the reducer cooling oil does not flow through the heat exchanger 1, and the reducer oil circuit does not exchange heat with the motor cooling water circuit. The 3 port of the first four-way valve is closed and the 4 port is opened, the 1 port of the second four-way valve is closed and the 4 port is opened, the reducer cooling oil flows through the heat exchanger 2, the reducer heat flows to the power battery, the battery is heated, the battery is warmed up, the discharge capacity is improved, and the power performance is ensured.

[0096] It can be seen that through the above steps, first, by monitoring the motor system cooling water temperature in real time and comparing it with the ambient temperature and the first value, the system can intelligently judge the heat source selection of the vehicle air conditioner cooler, when the motor system water temperature is high, the motor waste heat is preferentially used for heating, reducing the dependence on external air source heat pump, thereby reducing the air conditioning energy consumption. Secondly, the above steps are based on the heat exchange control mechanism, by adjusting the working state of the first four-way valve and the second four-way valve, the heat exchange between the motor system and the reducer is effectively isolated, avoiding the loss of the reducer waste heat under the condition that the battery discharge capacity is insufficient, and instead directing the part of the heat to the power battery, heating the battery, significantly improving the performance of the battery under low temperature conditions, enhancing the power output capability of the vehicle, and at the same time ensuring the efficient use of energy.

[0097] Optionally, in step S142, the low-temperature thermal management of the vehicle based on the fifth control strategy can include the following execution steps:

[0098] Step S1421, acquiring the motor system cooling water temperature, the reducer oil circuit oil temperature and the power battery cooling water temperature;

[0099] Step S1422, in response to the motor system cooling water temperature being greater than or equal to the sum of the reducer oil circuit oil temperature and the second value, adjusting the working state of the first four-way valve to connect the heat exchange between the reducer and the motor system;

[0100] Step S1423, in response to the motor system cooling water temperature being less than the reducer oil circuit oil temperature, adjusting the working state of the first four-way valve to block the heat exchange between the reducer and the motor system;

[0101] Step S1424, in response to the power battery cooling water temperature being less than the reducer oil circuit oil temperature, adjusting the working state of the first four-way valve and the working state of the second four-way valve to block the heat exchange between the reducer and the power battery;

[0102] Step S1425, in response to the power battery cooling water temperature being greater than or equal to the sum of the reducer oil circuit oil temperature and the third value, adjusting the working state of the first four-way valve and the working state of the second four-way valve to connect the heat exchange between the reducer and the power battery.

[0103] In the embodiment of the application, the power battery cooling water temperature is the water temperature in the power battery cooling system, reflecting the thermal state of the battery system under the current environment. In a low temperature environment, maintaining the battery cooling water temperature in an appropriate range can avoid rapid decline in battery performance, ensuring the power performance and driving safety of the vehicle.

[0104] The third value is a preset temperature difference threshold value for determining whether heat exchange between the power battery cooling water temperature and the reducer oil circuit oil temperature is beneficial. The third value ΔT3 is selected according to the thermal characteristics of the battery, the safety threshold and the efficiency of the reducer, to ensure that the maximum utilization of thermal energy is achieved while the battery is not damaged. For example, ΔT3 can be 5°C, which is not limited here.

[0105] In response to the motor system cooling water temperature being greater than or equal to the sum of the reducer oil circuit oil temperature and the second value, the working state of the first four-way valve is adjusted to enable heat exchange between the reducer and the motor system. If T_reducer_oil+ΔT2 is less than or equal to T_motor_water, port 1 of the first four-way valve is opened and port 2 is closed, the reducer cooling oil flows through the heat exchanger 1 and exchanges heat with the motor cooling water circuit, the electric drive cooling water circuit is heated by the reducer oil circuit, the reducer oil temperature is increased, and the efficiency of the reducer is improved.

[0106] In response to the motor system cooling water temperature being less than the reducer oil circuit oil temperature, the working state of the first four-way valve is adjusted to block heat exchange between the reducer and the motor system. If T_reducer_oil is greater than T_motor_water, port 1 of the first four-way valve is closed and port 2 is opened, the reducer cooling oil does not flow through the heat exchanger 1, and the reducer cooling oil circuit does not exchange heat with the motor cooling water circuit, to prevent heat from flowing from the reducer cooling oil circuit to the motor cooling water circuit. Since the efficiency of the reducer is greatly affected by the oil temperature, and the efficiency of the motor is less affected by the cooling water temperature, the oil temperature of the reducer is as high as possible to ensure the efficiency of the reducer.

[0107] In response to the power battery cooling water temperature being less than the reducer oil circuit oil temperature, the working state of the first four-way valve and the working state of the second four-way valve are adjusted to block heat exchange between the reducer and the power battery. If T_reducer_oil is greater than T_Batt_water, port 4 of the first four-way valve is closed and port 4 of the second four-way valve is also closed, the reducer cooling oil does not flow through the heat exchanger 2, and the heat of the reducer does not exchange with the power battery, so that the heat is left to the reducer itself to ensure the oil temperature of the reducer and improve the efficiency of the reducer.

[0108] In response to the power battery cooling water temperature being greater than or equal to the sum of the reducer oil circuit oil temperature and the third value, the working state of the first four-way valve and the working state of the second four-way valve are adjusted to connect the heat exchange between the reducer and the power battery. It can be understood that if T_reducer_oil+ΔT3 is less than or equal to T_Batt_water, the 4th port of the first four-way valve is opened and the 3rd port is closed, the 4th port of the second four-way valve is opened and the 1st port is closed, the reducer cooling oil flows through the heat exchanger 2, and the battery cooling water is used to heat the reducer oil circuit. By increasing the temperature of the reducer oil, the efficiency of the reducer in a low temperature state is improved.

[0109] It can be seen that through the above steps, the system monitors the motor system cooling water temperature, the reducer oil circuit oil temperature and the power battery cooling water temperature in real time, and determines the heat exchange strategy according to the preset second value and third value. When the motor system cooling water temperature is high enough, the heat exchange between the reducer and the motor system is promoted, the waste heat of the reducer is effectively utilized, and the waste of heat is avoided. When the motor system water temperature is low and is not sufficient for beneficial heat exchange with the reducer, the heat exchange is blocked in time to prevent the reduction of the reducer oil temperature. At the same time, the system also intelligently selects whether to connect the heat exchange between the reducer and the power battery according to the power battery cooling water temperature. When the battery water temperature is lower than the reducer oil temperature, heat exchange is avoided to prevent the battery temperature from being too low, and vice versa. The reducer oil temperature is used to increase the battery temperature, the low temperature performance of the battery is improved, and the driving power of the vehicle is ensured. Through the dynamic adjustment of the above steps, the present application can optimize the utilization of vehicle thermal energy, reduce the energy consumption of the air conditioning system, and improve the driving experience and operating efficiency of the vehicle in cold conditions.

[0110] Optionally, in step S143, the low-temperature thermal management of the vehicle based on the sixth control strategy can include the following execution steps:

[0111] Step S1431, obtaining the motor system cooling water temperature, the reducer oil circuit oil temperature and the power battery cooling water temperature;

[0112] Step S1432, in response to the motor system cooling water temperature being greater than or equal to the sum of the reducer oil circuit oil temperature and the second value, adjusting the working state of the first four-way valve to connect the heat exchange between the reducer and the motor system;

[0113] Step S1433, in response to the motor system cooling water temperature being less than the reducer oil circuit oil temperature, adjusting the working state of the first four-way valve to block the heat exchange between the reducer and the motor system;

[0114] Step S1434, in response to the reducer oil circuit oil temperature being greater than the sum of the power battery cooling water temperature and the fourth value, adjusting the working state of the first four-way valve and the working state of the second four-way valve to connect the heat exchange between the reducer and the power battery;

[0115] In step S1435, in response to the reducer oil circuit oil temperature being less than or equal to the power battery cooling water temperature, the working state of the first four-way valve and the working state of the second four-way valve are adjusted to block the heat exchange between the reducer and the power battery.

[0116] In the embodiment of the present application, the fourth value is a preset temperature difference threshold value, which is used to determine whether the temperature difference between the reducer oil circuit oil temperature and the power battery cooling water temperature is large enough to enable effective heat exchange without causing overheating risk or efficiency loss of the power battery. Exemplarily, the fourth value ΔT4 can be 5°C, which is not limited herein.

[0117] In response to the motor system cooling water temperature being greater than or equal to the sum of the reducer oil circuit oil temperature and the second value, the working state of the first four-way valve is adjusted to enable the heat exchange between the reducer and the motor system. It can be understood that if T_reducer_oil+ΔT2 is less than or equal to T_motor_water, port 1 of the first four-way valve is opened and port 2 is closed, the reducer cooling oil flows through the heat exchanger 1 to perform heat exchange with the motor cooling water circuit, the motor cooling water circuit is heated by the reducer oil circuit, and the efficiency of the reducer is improved by increasing the temperature of the reducer oil.

[0118] In response to the motor system cooling water temperature being less than the reducer oil circuit oil temperature, the working state of the first four-way valve is adjusted to block the heat exchange between the reducer and the motor system. It can be understood that if T_reducer_oil is greater than T_motor_water, port 1 of the first four-way valve is closed and port 2 is opened, the reducer cooling oil does not flow through the heat exchanger 1, and the reducer cooling oil circuit does not perform heat exchange with the motor cooling water circuit, thereby preventing the heat in the reducer cooling oil circuit from flowing to the motor cooling water circuit. Since the efficiency of the reducer is greatly affected by the oil temperature, while the efficiency of the motor is little affected by the cooling water temperature, the temperature of the reducer oil is as high as possible to ensure the efficiency of the reducer.

[0119] In response to the reducer oil circuit oil temperature being greater than the sum of the power battery cooling water temperature and the fourth value, the working state of the first four-way valve and the working state of the second four-way valve are adjusted to enable the heat exchange between the reducer and the power battery. It can be understood that if T_reducer_oil is greater than T_Batt_water+ΔT4, port 4 of the first four-way valve is opened and port 3 is closed, and port 4 of the second four-way valve is opened and port 1 is closed, the reducer cooling oil flows through the heat exchanger 2, and the reducer oil circuit is heated by the battery water circuit, thereby increasing the discharge capacity of the battery by increasing the temperature of the battery.

[0120] In response to the reducer oil circuit oil temperature being less than or equal to the power battery cooling water temperature, the working state of the first four-way valve and the working state of the second four-way valve are adjusted to block heat exchange between the reducer and the power battery. It can be understood that if T_reducer_oil is less than or equal to T_Batt_water, at this time, the 4th port of the first four-way valve is closed, and the 4th port of the second four-way valve is also closed, the reducer cooling oil does not flow through the heat exchanger 2, and the battery heat does not exchange with the reducer oil circuit, avoiding the flow of battery heat to the reducer oil circuit.

[0121] It can be seen that through the above steps, when the motor system cooling water temperature is high, the system will promote heat exchange between the reducer and the motor system by adjusting the first four-way valve, make full use of the waste heat of the reducer, improve the temperature of the electric drive system, reduce the energy consumption of the air conditioning heating, and at the same time guarantee the operation efficiency of the reducer. Conversely, when the motor system cooling water temperature is low, which is not conducive to heat exchange, the heat flow between the reducer and the motor is blocked, and unnecessary loss of the reducer oil temperature is avoided.

[0122] Optionally, the electric vehicle low-temperature thermal management method further comprises the following execution steps:

[0123] Step S15, acquiring the driving mode of the vehicle;

[0124] Step S16, in response to the driving mode being two-drive mode, adjusting the working state of the three-way valve to block heat exchange between the front electric drive system and the rear electric drive system; and,

[0125] Step S17, adjusting the working state of the second four-way valve to block heat exchange between the first reducer and the second reducer, wherein the first reducer and the second reducer are both internal components of the vehicle.

[0126] In the embodiment of the application, in response to the driving mode being two-drive mode, the working state of the three-way valve is adjusted to block heat exchange between the front electric drive system and the rear electric drive system, which can be understood as follows: when the driving mode of the vehicle is two-drive mode, i.e., the first electric drive (first motor, first inverter, first reducer) does not work, then the 1st port and the 2nd port of the three-way valve are communicated, and the 1st port and the 3rd port are closed, so that the cooling water does not flow through the first motor and the first inverter, thereby preventing the heat of the rear electric drive from flowing to the front electric drive, resulting in waste of heat.

[0127] Adjusting the working state of the second four-way valve to block heat exchange between the first reducer and the second reducer can be understood as follows: the 1st port and the 2nd port of the second four-way valve are communicated, and the 3rd port is closed, so that the reducer cooling oil does not flow through the first reducer, thereby preventing the heat of the second reducer from flowing to the first reducer, resulting in waste of heat.

[0128] It can be seen that by avoiding the non-working electric drive system and the reducer absorbing heat in the working system, the efficient operation of the thermal management system is ensured, especially in low temperature conditions, the energy consumption of air conditioning heating can be greatly reduced through the energy scheduling strategy, and the operating efficiency of the electric drive system and the reducer is improved, thereby ensuring the stability and economy of the power performance of the electric vehicle.

[0129] In the embodiment, an electric vehicle low-temperature thermal management system is also provided, Figure 2 is a structural diagram of an electric vehicle low-temperature thermal management system according to an embodiment of the present application, as Figure 2 shown, the electric vehicle low-temperature thermal management system includes an air conditioning system circuit, a motor system circuit, a reducer system circuit and a power battery system circuit.

[0130] The air conditioning system circuit includes an air conditioning cooler, an electric water pump 1, a compressor and other related components, and the air conditioning refrigerant is driven to flow and operate in the circuit by the electric water pump 1. The motor system cooling circuit includes a first motor, a first inverter, a second motor, a second inverter, a three-way valve, an electric water pump 2, an electric water pump 3 and a heat exchanger 1. The three-way valve can adjust the flow direction of the cooling water. When the three-way valve 12 port is connected and the 13 port is closed, the cooling water does not flow through the first motor and the first inverter. The air conditioning cooler is connected to the motor system circuit and can absorb heat from the motor system circuit. The electric water pump 2 operates to drive the cooling water to flow and operate in the second motor and the second inverter. The electric water pump 3 operates to drive the cooling water to flow and operate in the first motor and the first inverter. The reducer system cooling circuit includes a first reducer, a second reducer, an electric oil pump 3, an electric oil pump 4, a four-way valve 1 and a four-way valve 2. The electric oil pump 3 operates to drive the cooling oil to flow and operate in the second reducer. The electric oil pump 4 operates to drive the cooling oil to flow and operate in the first reducer. The four-way valve 1 and the four-way valve 2 can adjust the flow direction of the cooling oil. The heat exchanger 1 is connected to the motor cooling system circuit and the reducer cooling circuit to realize heat exchange between the two circuits. The battery system cooling circuit includes a power battery and an electric water pump 4. The electric water pump 4 operates to drive the cooling water to flow and operate in the power battery. The heat exchanger 2 is connected to the reducer cooling system circuit and the power battery system cooling circuit to realize heat exchange between the two circuits.

[0131] Those skilled in the art can clearly understand that the method according to the above-mentioned embodiments can be realized by means of software and necessary general hardware platform, of course, can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a plurality of instructions for making a terminal device (which can be a mobile phone, computer, server, or network device, etc.) execute the method of each embodiment of the present application.

[0132] In this embodiment, an electric vehicle low-temperature thermal management device is also provided, which is used to realize the above-mentioned embodiments and preferred embodiments, and will not be described again. As used below, the term "module" can be a combination of software and / or hardware that realizes a predetermined function. Although the device described in the following embodiments is preferably realized in software, hardware, or a combination of software and hardware is also possible and contemplated.

[0133] Figure 3 is a structural block diagram of an electric vehicle low-temperature thermal management device according to an embodiment of the present application, as Figure 3 shown, taking an electric vehicle low-temperature thermal management device 300 as an example, the device comprises: an acquisition module 301, configured to acquire an ambient temperature where the vehicle is located and a working state of a vehicle air conditioner; a first management module 302, configured to, in response to the vehicle air conditioner being in an open state and the ambient temperature being greater than a first temperature threshold, perform low-temperature thermal management on the vehicle based on a first control strategy, wherein the first control strategy is used to perform low-temperature thermal management on the vehicle when the heat pump system is in a running working condition; and a second management module 303, configured to, in response to the vehicle air conditioner being in a closed state or the ambient temperature being less than a second temperature threshold, perform low-temperature thermal management on the vehicle based on a second control strategy, wherein the second control strategy is used to perform low-temperature thermal management on the vehicle when the heat pump system is not in a running working condition.

[0134] It should be noted that the above-mentioned various modules can be realized by software or hardware, and for the latter, the following implementation manners can be used, but are not limited thereto: all the above-mentioned modules are located in the same processor; or the above-mentioned various modules are located in different processors in any combination.

[0135] The embodiments of the present application also provide a vehicle, comprising: a memory, which stores an executable program; and a processor, configured to run the program, wherein the program performs the electric vehicle low-temperature thermal management method in any one of the above-mentioned embodiments when running.

[0136] The embodiment of the present application also provides a computer readable storage medium, wherein the storage medium stores a computer program, and the computer program is configured to execute the steps in any one of the method embodiments when running on a computer or a processor.

[0137] Optionally, in the embodiment, the computer readable storage medium is configured to store a computer program for executing the following steps.

[0138] Step S10: acquiring an ambient temperature where a vehicle is located and a working state of a vehicle air conditioner;

[0139] Step S12: in response to the vehicle air conditioner being in an open state and the ambient temperature being greater than a first temperature threshold, performing low-temperature thermal management on the vehicle based on a first control strategy, wherein the first control strategy is used for performing low-temperature thermal management on the vehicle when the heat pump system is in a running working condition.

[0140] Step S14: in response to the vehicle air conditioner being in a closed state or the ambient temperature being less than a second temperature threshold, performing low-temperature thermal management on the vehicle based on a second control strategy, wherein the second control strategy is used for performing low-temperature thermal management on the vehicle when the heat pump system is not in the running working condition.

[0141] Optionally, in the embodiment, the computer readable storage medium can include but is not limited to a U disk, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk and various storage media that can store a computer program.

[0142] The embodiment of the present application also provides an electronic device, comprising a memory and a processor, wherein the memory stores a computer program, and the processor is configured to execute the computer program to perform the steps in any one of the method embodiments.

[0143] Optionally, in the embodiment, the processor in the electronic device is configured to execute the computer program to perform the following steps.

[0144] Step S10: acquiring an ambient temperature where a vehicle is located and a working state of a vehicle air conditioner;

[0145] Step S12: in response to the vehicle air conditioner being in an open state and the ambient temperature being greater than a first temperature threshold, performing low-temperature thermal management on the vehicle based on a first control strategy, wherein the first control strategy is used for performing low-temperature thermal management on the vehicle when the heat pump system is in a running working condition.

[0146] In response to the vehicle air conditioner being in the closed state or the ambient temperature being less than a second temperature threshold, the vehicle is subjected to low-temperature thermal management based on a second control strategy, where the second control strategy is used to subject the vehicle to low-temperature thermal management when the heat pump system is not in the operating condition.

[0147] The embodiments of the present application also provide a computer program product comprising a computer program which, when executed by a processor, implements the steps in any of the method embodiments described above.

[0148] Optionally, in the present embodiment, the computer program in the computer program product described above, when executed by the processor, can be configured to perform the following steps:

[0149] In step S10, the ambient temperature in which the vehicle is located and the working state of the vehicle air conditioner are acquired.

[0150] In response to the vehicle air conditioner being in the opened state and the ambient temperature being greater than a first temperature threshold, the vehicle is subjected to low-temperature thermal management based on a first control strategy, where the first control strategy is used to subject the vehicle to low-temperature thermal management when the heat pump system is in the operating condition.

[0151] In response to the vehicle air conditioner being in the closed state or the ambient temperature being less than a second temperature threshold, the vehicle is subjected to low-temperature thermal management based on a second control strategy, where the second control strategy is used to subject the vehicle to low-temperature thermal management when the heat pump system is not in the operating condition.

[0152] Optionally, the specific examples in the present embodiment can refer to the examples described in the above embodiments and optional implementation manners, and the present embodiment will not be described here again.

[0153] The serial numbers of the above embodiments of the present application are only for description, and do not represent the advantages and disadvantages of the embodiments.

[0154] In the above embodiments of the present application, the description of each embodiment has its own focus, and the parts not described in detail in a certain embodiment can be referred to the related description of other embodiments.

[0155] In the several embodiments of the present application, it should be understood that the disclosed technology can be implemented in other ways. Of course, the unit embodiment described above is only schematic. For example, the division of the units can be a logical function division. There can be another division manner in actual implementation. For example, a plurality of units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the coupling or direct coupling or communication connection between the units shown or discussed can be indirect coupling or communication connection through some interfaces, units or modules. There can be electrical or other forms.

[0156] The units described as separate components may or may not be physically separate, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple units. Part or all of the units can be selected according to actual needs to achieve the purpose of the embodiment scheme.

[0157] In addition, each functional unit in each embodiment of the present application can be integrated in one processing unit, or each unit can exist physically, or two or more units can be integrated in one unit. The integrated unit can be realized in the form of hardware or in the form of a software functional unit.

[0158] The integrated unit, if realized in the form of a software functional unit and sold or used as an independent product, can be stored in a computer readable storage medium. Based on this understanding, the technical solutions of the present application, essentially or the part that contributes to the prior art, or all or part of the technical solutions can be embodied in the form of a software product. The computer software product is stored in a storage medium, including a number of instructions to make a computer device (which can be a personal computer, a server or a network device, etc.) execute all or part of the steps of the method described in each embodiment of the present application. The foregoing storage medium includes: a U disk, a read-only memory (Read-Only Memory, ROM), a random access memory (Random Access Memory, RAM), a mobile hard disk, a magnetic disk or an optical disk, and various program code storage media.

[0159] The above is only the preferred embodiment of the present application, it should be noted that for those skilled in the art, without departing from the principles of the present application, can make a number of improvements and refinements, these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A method for low-temperature thermal management of electric vehicles, characterized in that, include: Obtain the ambient temperature of the vehicle and the operating status of the vehicle's air conditioning; In response to the vehicle's air conditioning being turned on and the ambient temperature being greater than a first temperature threshold, the vehicle is subjected to low-temperature thermal management based on a first control strategy, wherein the first control strategy is used to perform low-temperature thermal management on the vehicle when the heat pump system is in operation. In response to the vehicle's air conditioning being turned off, or the ambient temperature being lower than a second temperature threshold, the vehicle is subjected to low-temperature thermal management based on a second control strategy, wherein the second control strategy is used to perform low-temperature thermal management on the vehicle when the heat pump system is not in operation.

2. The method according to claim 1, characterized in that, The first control strategy includes a third control strategy and a fourth control strategy. The third control strategy is used to perform low-temperature thermal management on the vehicle when the discharge capacity of the power battery is greater than or equal to a preset threshold. The fourth control strategy is used to perform low-temperature thermal management on the vehicle when the discharge capacity of the power battery is less than the preset threshold. The low-temperature thermal management of the vehicle based on the first control strategy includes: Obtain the peak discharge power of the power battery; In response to the peak discharge power being greater than a first power threshold, the vehicle is subjected to low-temperature thermal management based on the third control strategy; In response to the peak discharge power being less than or equal to the second power threshold, the vehicle is subjected to low-temperature thermal management based on the fourth control strategy.

3. The method according to claim 1, characterized in that, The second control strategy includes a fifth control strategy and a sixth control strategy. The fifth control strategy is used to perform low-temperature thermal management on the vehicle when the power battery discharge capacity is greater than or equal to a preset threshold. The sixth control strategy is used to perform low-temperature thermal management on the vehicle when the power battery discharge capacity is less than the preset threshold. The low-temperature thermal management of the vehicle based on the second control strategy includes: Obtain the peak discharge power of the power battery; In response to the peak discharge power being greater than the third power threshold, the vehicle is subjected to low-temperature thermal management based on the fifth control strategy; In response to the peak discharge power being less than or equal to the fourth power threshold, the vehicle is subjected to low-temperature thermal management based on the sixth control strategy.

4. The method according to claim 2, characterized in that, The low-temperature thermal management of the vehicle based on the third control strategy includes: Obtain the cooling water temperature of the motor system and the oil temperature of the reducer's oil circuit; In response to the motor system cooling water temperature being greater than or equal to the sum of the ambient temperature and a first value, the vehicle air conditioning cooler is controlled to absorb heat from the motor system; In response to the motor system cooling water temperature being less than or equal to the ambient temperature, the vehicle air conditioning cooler is controlled to absorb heat from the air source; In response to the oil temperature in the reducer oil circuit being greater than or equal to the sum of the cooling water temperature of the motor system and a second value, the working state of the first four-way valve is adjusted to connect the heat exchange between the reducer and the motor system. In response to the oil temperature in the reducer oil circuit being lower than the cooling water temperature of the motor system, the operating state of the first four-way valve is adjusted to block the heat exchange between the reducer and the motor system; Adjust the operating state of the first four-way valve to block heat exchange between the reducer and the power battery.

5. The method according to claim 2, characterized in that, The low-temperature thermal management of the vehicle based on the fourth control strategy includes: Obtain the cooling water temperature of the motor system; In response to the motor system cooling water temperature being greater than or equal to the sum of the ambient temperature and a first value, the vehicle air conditioning cooler is controlled to absorb heat from the motor system; In response to the motor system cooling water temperature being less than or equal to the ambient temperature, the vehicle air conditioning cooler is controlled to absorb heat from the air source; Adjust the operating states of the first four-way valve and the second four-way valve to block heat exchange between the reducer and the motor system, and to connect the reducer to the power battery.

6. The method according to claim 3, characterized in that, The low-temperature thermal management of the vehicle based on the fifth control strategy includes: Obtain the cooling water temperature of the motor system, the oil temperature of the reducer oil circuit, and the cooling water temperature of the power battery; In response to the motor system cooling water temperature being greater than or equal to the sum of the reducer oil circuit temperature and the second value, the working state of the first four-way valve is adjusted to connect the heat exchange between the reducer and the motor system. In response to the fact that the cooling water temperature of the motor system is lower than the oil temperature of the reducer oil circuit, the working state of the first four-way valve is adjusted to block the heat exchange between the reducer and the motor system; In response to the fact that the cooling water temperature of the power battery is lower than the oil temperature of the reducer oil circuit, the working state of the first four-way valve and the working state of the second four-way valve are adjusted to block the heat exchange between the reducer and the power battery. In response to the sum of the power battery cooling water temperature and the reducer oil circuit temperature and a third value, the working state of the first four-way valve and the working state of the second four-way valve are adjusted to connect the heat exchange between the reducer and the power battery.

7. The method according to claim 3, characterized in that, The low-temperature thermal management of the vehicle based on the sixth control strategy includes: Obtain the cooling water temperature of the motor system, the oil temperature of the reducer oil circuit, and the cooling water temperature of the power battery; In response to the motor system cooling water temperature being greater than or equal to the sum of the reducer oil circuit temperature and the second value, the working state of the first four-way valve is adjusted to connect the heat exchange between the reducer and the motor system. In response to the fact that the cooling water temperature of the motor system is lower than the oil temperature of the reducer oil circuit, the working state of the first four-way valve is adjusted to block the heat exchange between the reducer and the motor system; In response to the fact that the oil temperature in the reducer oil circuit is greater than the sum of the cooling water temperature of the power battery and the fourth value, the working state of the first four-way valve and the working state of the second four-way valve are adjusted to connect the heat exchange between the reducer and the power battery. In response to the oil temperature in the reducer oil circuit being less than or equal to the cooling water temperature of the power battery, the operating states of the first four-way valve and the second four-way valve are adjusted to block heat exchange between the reducer and the power battery.

8. The method according to any one of claims 1-7, characterized in that, The method further includes: Obtain the vehicle's drive mode; In response to the driving mode being two-wheel drive mode, the operating state of the three-way valve is adjusted to block heat exchange between the front electric drive system and the rear electric drive system; and, The operating state of the second four-way valve is adjusted to block heat exchange between the first reducer and the second reducer, wherein the first reducer and the second reducer are both internal components of the vehicle.

9. A low-temperature thermal management system for electric vehicles, used to perform the method according to any one of claims 1-8, characterized in that, include: Air conditioning system circuit, motor system circuit, reducer system circuit and power battery system circuit.

10. A vehicle, characterized in that, include: Memory, which stores executable programs; A processor for running the program, wherein the program, when running, executes the low-temperature thermal management method for electric vehicles as described in any one of claims 1 to 8.

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