Control Method, Device, Equipment and Storage Medium for Electric Vehicle Heat Pump Air Conditioning System

Abstract

The present invention provides a control method, device, equipment and storage medium for an electric vehicle heat pump air conditioning system. The method includes obtaining the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system and the dew point temperature of the external air, obtaining the difference between the dew point temperature of the external air and the initial temperature of the coolant to obtain a first trigger temperature value; when the heat pump is heating, if the initial temperature of the coolant is less than or equal to the water vapor frost point temperature and the first trigger temperature value is greater than or equal to a first preset safety threshold, starting the motor to heat the coolant in the outdoor heat exchanger to increase the coolant temperature; obtaining the temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system after heating, and obtaining a second trigger temperature value according to the difference between the temperature of the coolant after heating and the dew point temperature of the external air; when the temperature of the coolant after heating is greater than or equal to a preset temperature value, or the second trigger temperature value is greater than or equal to a second preset safety threshold, the motor heating is exited. This application can prevent frosting on the surface of the outdoor heat exchanger in advance.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and particularly relates to a control method, device, equipment and storage medium for a heat pump air conditioning system of an electric vehicle. Background Art

[0002] When the heat pump of a pure electric vehicle heat pump air conditioning system is heating in winter, the outdoor heat exchanger acts as an evaporator to absorb the heat of the external environment, the indoor condenser releases heat to the indoor environment to achieve winter heating, the compressor compresses the refrigerant to generate high-temperature and high-pressure gas, and exchanges heat through the heating core to heat the passenger compartment or the battery. The refrigerant evaporator exchanges heat with the coolant of the electric drive circuit, absorbs the coolant temperature, and then exchanges heat with the air through the outdoor heat exchanger to absorb the air heat, reducing the air temperature on the surface of the outdoor radiator. In winter, the outdoor ambient temperature is relatively low. If the surface temperature of the outdoor heat exchanger is lower than the air dew point temperature, the moisture in the air will frost on the surface of the outdoor heat exchanger. The frost layer will hinder the heat exchange between the coolant of the outdoor heat exchanger and the external environment, which is not conducive to the normal operation of the system and may even fail to provide normal heating function. There are two hot gas defrosting methods in the existing heat pump type vehicle air conditioning defrosting system: one is low-pressure hot gas defrosting after expansion, and the other is high-pressure hot gas defrosting before expansion. However, the inventor of the present application has found through research that the existing defrosting technology on the surface of the outdoor heat exchanger is to defrost by changing the direction of the air conditioner compressor, and cannot prevent the surface of the outdoor heat exchanger from frosting in advance. Summary of the Invention

[0003] Aiming at the technical problem that in the existing pure electric vehicle heat pump air conditioning system, when the heat pump is heating in winter, the defrosting technology on the surface of the outdoor heat exchanger is to defrost by changing the direction of the air conditioner compressor, and cannot prevent the surface of the outdoor heat exchanger from frosting in advance, the present invention provides a control method, device, equipment and storage medium for a heat pump air conditioning system of an electric vehicle.

[0004] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0005] On the one hand, the present invention provides a control method for a heat pump air conditioning system of an electric vehicle, including:

[0006] Obtain the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system and the dew point temperature of the external air, and obtain the difference between the dew point temperature of the external air minus the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system to obtain a first trigger temperature value;

[0007] When the whole vehicle is performing heat pump heating, if the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system is less than or equal to the water vapor frost point temperature, and the first trigger temperature value is greater than or equal to a first preset safety threshold, start the motor to heat the coolant in the outdoor heat exchanger of the heat pump air conditioning system to increase the coolant temperature;

[0008] Obtain the temperature of the coolant after heating in the outdoor heat exchanger of the heat pump air conditioner system, and obtain a second trigger temperature value according to the difference between the temperature of the coolant after heating in the outdoor heat exchanger of the heat pump air conditioner system and the dew point temperature of the external air;

[0009] When the temperature of the coolant after heating in the outdoor heat exchanger of the heat pump air conditioner system is greater than or equal to a preset temperature value, or when the second trigger temperature value is greater than or equal to a second preset safety threshold, then stop the motor from heating the coolant in the outdoor heat exchanger of the heat pump air conditioner system.

[0010] Furthermore, the step of starting the motor to heat the coolant in the outdoor heat exchanger of the heat pump air conditioner system to increase the coolant temperature includes:

[0011] Obtain the mapping relationship between the frosting temperature value and the motor heating power;

[0012] According to the mapping relationship between the frosting temperature value and the motor heating power and the first trigger temperature value, obtain the target motor heating power;

[0013] Based on the target motor heating power, start the motor to heat the coolant in the outdoor heat exchanger of the heat pump air conditioner system to increase the coolant temperature.

[0014] Furthermore, the step of obtaining the mapping relationship between the frosting temperature value and the motor heating power includes:

[0015] Obtain a plurality of target frosting temperature values, where the target frosting temperature value is the difference between the coolant temperature in the outdoor heat exchanger and the dew point temperature of the external air, and the target frosting temperature value includes the first trigger temperature value;

[0016] Obtain the minimum heating power required to complete defrosting for each of the target frosting temperature values within a preset defrosting time, and obtain the motor heating power corresponding to the target frosting temperature value;

[0017] Establish the mapping relationship between the frosting temperature value and the motor heating power according to the plurality of target frosting temperature values and the motor heating power corresponding to the target frosting temperature value.

[0018] Furthermore, the method further includes:

[0019] Obtain the difference between the surface temperature of the outdoor heat exchanger of the heat pump air conditioner system and the internal temperature of the outdoor heat exchanger of the heat pump air conditioner system, and obtain the target difference;

[0020] Set the preset temperature value according to the target difference.

[0021] Furthermore, the step of obtaining the initial temperature and the heated temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioner system is obtained by collecting through a temperature sensor arranged at the coolant inlet of the outdoor heat exchanger.

[0022] Further, the dew point temperature of the outside air is obtained by referring to an air temperature - air humidity - dew point temperature conversion table.

[0023] Further, the air temperature and air humidity are obtained by collecting through temperature and humidity sensors arranged on the surface of the outdoor heat exchanger.

[0024] On the other hand, the present invention provides a control device for an electric vehicle heat pump air - conditioning system, including:

[0025] A first trigger temperature value acquisition module, configured to acquire the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air - conditioning system and the dew point temperature of the outside air, obtain the difference between the dew point temperature of the outside air minus the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air - conditioning system, and obtain a first trigger temperature value;

[0026] A heating start module, configured to, when the vehicle performs heat pump heating, if the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air - conditioning system is less than or equal to the water vapor frost point temperature, and the first trigger temperature value is greater than or equal to a first preset safety threshold, start the motor to heat the coolant in the outdoor heat exchanger of the heat pump air - conditioning system to increase the coolant temperature;

[0027] A second trigger temperature value acquisition module, configured to acquire the temperature of the coolant in the outdoor heat exchanger of the heat pump air - conditioning system after heating, and obtain a second trigger temperature value according to the difference between the temperature of the coolant in the outdoor heat exchanger of the heat pump air - conditioning system after heating minus the dew point temperature of the outside air;

[0028] A heating exit module, configured to, when the temperature of the coolant in the outdoor heat exchanger of the heat pump air - conditioning system after heating is greater than or equal to a preset temperature value, or the second trigger temperature value is greater than or equal to a second preset safety threshold, exit the motor from heating the coolant in the outdoor heat exchanger of the heat pump air - conditioning system.

[0029] On yet another aspect, the present invention provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the computer program, the steps in the above - mentioned control method for an electric vehicle heat pump air - conditioning system are implemented.

[0030] On still another aspect, the present invention provides a computer - readable storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the steps in the above - mentioned control method for an electric vehicle heat pump air - conditioning system are implemented.

[0031] Compared with the prior art, the control method, device, equipment and storage medium of the electric vehicle heat pump air conditioning system provided by the present invention obtain the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system and the dew point temperature of the external air, and use the difference between the dew point temperature of the external air and the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system as the first trigger temperature value; when the vehicle conducts heat pump heating, if the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system is less than or equal to the water vapor frost point temperature, and the first trigger temperature value is greater than or equal to the first preset safety threshold, the motor is started to heat the coolant to increase the coolant temperature to turn on the anti-frost function; the temperature of the coolant after heating in the outdoor heat exchanger of the heat pump air conditioning system is obtained, and the difference between the temperature of the coolant after heating in the outdoor heat exchanger of the heat pump air conditioning system and the dew point temperature of the external air is used as the second trigger temperature value; when the temperature of the coolant after heating in the outdoor heat exchanger of the heat pump air conditioning system is greater than or equal to the preset temperature value, or the second trigger temperature value is greater than or equal to the second preset safety threshold, the motor is stopped from heating the coolant in the outdoor heat exchanger of the heat pump air conditioning system. Based on the existing system architecture of the company that uses the electric drive coolant temperature for heat exchange and the motor to heat the coolant temperature during heat pump heating, during heat pump heating, the first preset safety threshold and the relatively low initial temperature of the coolant are used to judge whether the surface of the outdoor heat exchanger is frosted, and the measure of starting the motor to heat the coolant is used to quickly heat the coolant temperature to prevent the surface of the outdoor heat exchanger from frosting during heat pump heating, and the coolant temperature is quickly heated through the motor heating power corresponding to different frost temperature values. When the second preset safety threshold is reached or the temperature of the coolant after heating is relatively high, the motor heating is stopped. Therefore, the frosting on the surface of the outdoor heat exchanger can be prevented in advance, which is applicable to idling and driving processes, ensuring the normal operation of the system. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic flowchart of the control method of the electric vehicle heat pump air conditioning system provided by an embodiment of the present invention.

[0033] Figure 2 It is a linear graph of the frost temperature value and the motor heating power provided by an embodiment of the present invention.

[0034] Figure 3 It is a structural block diagram of the control device of the electric vehicle heat pump air conditioning system provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] In order to make the technical means, creative features, achieved purposes and effects of the present invention easy to understand, the present invention will be further described below with reference to specific illustrations.

[0036] As a specific embodiment, please refer to Figure 1 shown, the present invention provides a control method for an electric vehicle heat pump air conditioning system, including:

[0037] Obtain the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system and the dew point temperature of the outside air, and obtain the difference between the dew point temperature of the outside air minus the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system to obtain the first trigger temperature value;

[0038] When the vehicle is performing heat pump heating, if the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system is less than or equal to the water vapor frost point temperature (for example, the water vapor frost point temperature is 0°C), and the first trigger temperature value is greater than or equal to the first preset safety threshold, start the motor to heat the coolant in the outdoor heat exchanger of the heat pump air conditioning system to increase the coolant temperature to turn on the anti-frost function;

[0039] Obtain the temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system after heating, and obtain the second trigger temperature value according to the difference between the temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system after heating minus the dew point temperature of the outside air;

[0040] When the temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system after heating is greater than or equal to the preset temperature value, or the second trigger temperature value is greater than or equal to the second preset safety threshold, then stop the motor from heating the coolant in the outdoor heat exchanger of the heat pump air conditioning system.

[0041] In one embodiment, the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system may be the coolant temperature collected when determining whether the coolant needs to be heated.

[0042] In one embodiment, starting the motor to heat the coolant in the outdoor heat exchanger of the heat pump air conditioning system to increase the coolant temperature includes:

[0043] Obtain the mapping relationship between the frost temperature value and the motor heating power;

[0044] According to the mapping relationship between the frost temperature value and the motor heating power and the first trigger temperature value, obtain the target motor heating power; that is, according to the first trigger temperature value, the corresponding motor heating power can be found in the mapping relationship between the frost temperature value and the motor heating power, and this motor heating power is used as the target motor heating power;

[0045] Based on the target motor heating power, start the motor to heat the coolant in the outdoor heat exchanger of the heat pump air conditioning system to increase the coolant temperature.

[0046] In one embodiment, the mapping relationship between the frost temperature value and the motor heating power may be a linear chart of the frost temperature value and the motor heating power. Specifically, the linear chart of the frost temperature value and the motor heating power is as Figure 2As shown, this chart was obtained by the inventors of this application through real vehicle tests to verify creativity. From this chart, it can be seen that the lower the frosting temperature value, the greater the motor heating power.

[0047] In one embodiment, obtaining the mapping relationship between the frosting temperature value and the motor heating power includes:

[0048] Obtain a plurality of target frosting temperature values, where the target frosting temperature value is the difference between the coolant temperature in the outdoor heat exchanger and the dew point temperature of the outside air, and the target frosting temperature value includes the first trigger temperature value;

[0049] Obtain the minimum heating power for defrosting each of the target frosting temperature values within the preset defrosting time, and obtain the motor heating power corresponding to the target frosting temperature value;

[0050] Establish the mapping relationship between the frosting temperature value and the motor heating power according to the plurality of target frosting temperature values and the motor heating power corresponding to the target frosting temperature value.

[0051] Specifically, in this embodiment, the inventors of this application have found through research that the linear chart of the frosting temperature value and the motor heating power can be calibrated through defrosting time, frosting temperature value, and optimal motor heating power tests to determine the optimal motor heating power at different frosting temperature values. This optimal motor heating power is the motor heating power corresponding to the fastest defrosting with the lowest vehicle energy consumption, that is, the lowest heating power that can complete defrosting within the preset defrosting time. Among them, the preset defrosting time can be set according to actual needs, for example, it can be 1 minute or 2 minutes, etc.

[0052] In one embodiment, the method further includes:

[0053] Obtain the difference between the surface temperature of the outdoor heat exchanger of the heat pump air conditioning system and the internal temperature of the outdoor heat exchanger of the heat pump air conditioning system to obtain a target difference;

[0054] Set the preset temperature value according to the target difference.

[0055] Specifically, in this embodiment, the preset temperature value is greater than or equal to the target difference, and the preset temperature value can be set to 3°C according to experience. Specifically, since there is a temperature difference between the inside and the surface of the outdoor heat exchanger of the heat pump air conditioning system, in order to fully ensure that the surface temperature of the outdoor heat exchanger of the heat pump air conditioning system is greater than 0°C and does not frost, the value of the preset temperature value is preferentially set to 3°C in this embodiment. That is, when the temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system is heated to be greater than or equal to 3°C, it can well prevent the surface of the outdoor heat exchanger of the heat pump air conditioning system from frosting in advance.

[0056] In one embodiment, the initial temperature and the heated temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioner system are obtained by collecting through a temperature sensor arranged at the coolant inlet of the outdoor heat exchanger, that is, by arranging a coolant temperature sensor at the coolant inlet of the outdoor heat exchanger to collect the initial temperature of the coolant in the outdoor heat exchanger and the temperature of the coolant after heating. When the initial temperature of the coolant is lower than the dew point temperature of the outside air, it indicates that the surface of the outdoor heat exchanger is more likely to frost; and the frosting temperature value = the dew point temperature of the outside air - the initial temperature of the coolant. When the frosting temperature value is greater than or equal to 0°C, frosting will occur. Among them, the temperature sensor for collecting the coolant temperature can be implemented by using existing temperature sensors well-known to those skilled in the art, and details are not described herein again.

[0057] In one embodiment, the dew point temperature of the outside air is obtained by looking up in an air temperature - air humidity - dew point temperature conversion table, that is, the dew point temperature of the outside air can be quickly found through the air temperature - air humidity - dew point temperature conversion table; among them, the method for obtaining the air temperature - air humidity - dew point temperature conversion table includes: collecting the air temperature, air humidity, and dew point temperature, establishing the correlation relationship among the air temperature, air humidity, and dew point temperature, and obtaining the air temperature - air humidity - dew point temperature conversion table.

[0058] In one embodiment, the air temperature and air humidity are obtained by collecting through a temperature and humidity sensor arranged on the surface of the outdoor heat exchanger, that is, by arranging an external temperature and humidity sensor on the surface of the outdoor heat exchanger to collect the air temperature and air humidity, and then the dew point temperature of the outside air can be found through the air temperature - air humidity - dew point temperature conversion table. Among them, the temperature and humidity sensor can specifically be implemented by using existing temperature and humidity sensors well-known to those skilled in the art, and details are not described herein again.

[0059] In one embodiment, for the first preset safety threshold and the second preset safety threshold, those skilled in the art can verify through vehicle tests, and confirm according to the ambient temperature, ambient humidity, and the required temperature for heating the coolant by observing the change of the frosting temperature value and the frosting time on the surface of the outdoor heat exchanger, and such a confirmation process is relatively easy to achieve for those skilled in the art; of course, the first preset safety threshold and the second preset safety threshold can also be set according to the actual working conditions.

[0060] At this point, those skilled in the art should understand that although the steps in the flowchart are sequentially shown according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless there is a clear description in this article, that is, the execution of these steps has no strict order limit, and these steps can be executed in other orders. Moreover, at least a part of the steps in the flowchart may include multiple sub-steps or multiple stages. These sub-steps or stages do not have to be executed at the same time, but can be executed at different times. The execution order of these sub-steps or stages does not have to be sequential either, but can be executed alternately or in turn with at least a part of other steps or sub-steps or stages of other steps.

[0061] As another specific embodiment, please refer to Figure 3 As shown, the present invention provides a control device for an electric vehicle heat pump air conditioning system, including:

[0062] A first trigger temperature value acquisition module, configured to acquire the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system and the dew point temperature of the external air, and obtain a difference between the dew point temperature of the external air minus the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system, so as to obtain a first trigger temperature value;

[0063] A heating start module, configured to, when the vehicle performs heat pump heating, if the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system is less than or equal to the water vapor frost point temperature (for example, the water vapor frost point temperature is 0 °C), and the first trigger temperature value is greater than or equal to a first preset safety threshold, start the motor to heat the coolant in the outdoor heat exchanger of the heat pump air conditioning system to increase the coolant temperature, so as to turn on the anti-frost function;

[0064] A second trigger temperature value acquisition module, configured to acquire the temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system after heating, and obtain a second trigger temperature value according to a difference between the temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system after heating minus the dew point temperature of the external air;

[0065] A heating exit module, configured to, when the temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system after heating is greater than or equal to a preset temperature value, or the second trigger temperature value is greater than or equal to a second preset safety threshold, exit the motor from heating the coolant in the outdoor heat exchanger of the heat pump air conditioning system.

[0066] In one implementation manner, the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system may be the coolant temperature collected when determining whether the coolant needs to be heated. In one implementation manner, it further includes:

[0067] The starting the motor to heat the coolant in the outdoor heat exchanger of the heat pump air conditioning system to increase the coolant temperature includes:

[0068] Obtain the mapping relationship between the frosting temperature value and the motor heating power;

[0069] According to the mapping relationship between the frosting temperature value and the motor heating power and the first trigger temperature value, obtain the target motor heating power; that is, according to the first trigger temperature value, the corresponding motor heating power can be found in the mapping relationship between the frosting temperature value and the motor heating power, and this motor heating power is used as the target motor heating power;

[0070] Based on the target motor heating power, start the motor to heat the coolant in the outdoor heat exchanger of the heat pump air conditioning system to raise the coolant temperature.

[0071] In one of the embodiments, the mapping relationship between the frosting temperature value and the motor heating power may be a linear chart of the frosting temperature value and the motor heating power. Specifically, the linear chart of the frosting temperature value and the motor heating power is as Figure 2 shown. This chart is obtained by the inventor of the present application through vehicle tests to verify the creativity, and it can be seen from this chart that the lower the frosting temperature value, the greater the motor heating power.

[0072] In one of the embodiments, it further includes:

[0073] The obtaining of the mapping relationship between the frosting temperature value and the motor heating power includes:

[0074] Obtain a plurality of target frosting temperature values, where the target frosting temperature value is the difference between the coolant temperature in the outdoor heat exchanger and the dew point temperature of the outside air, and the target frosting temperature value includes the first trigger temperature value;

[0075] Obtain the minimum heating power for defrosting to be completed within the preset defrosting time for each of the target frosting temperature values, and obtain the motor heating power corresponding to the target frosting temperature value;

[0076] Establish the mapping relationship between the frosting temperature value and the motor heating power according to the plurality of target frosting temperature values and the motor heating power corresponding to the target frosting temperature value.

[0077] Specifically in this embodiment, the inventor of the present application has found through research that the linear chart of the frosting temperature value and the motor heating power can be calibrated through defrosting time, frosting temperature value, and optimal motor heating power tests to determine the optimal motor heating power at different frosting temperature values. This optimal motor heating power is the motor heating power corresponding to the fastest defrosting with the lowest vehicle energy consumption, that is, the minimum heating power that can complete defrosting within the preset defrosting time. Among them, the preset defrosting time can be set according to actual needs, for example, it can be 1 minute or 2 minutes, etc.

[0078] In one embodiment, the method further includes:

[0079] Obtaining a difference between the surface temperature and the internal temperature of the outdoor heat exchanger of the heat pump air-conditioning system to obtain a target difference;

[0080] Setting the preset temperature value according to the target difference.

[0081] Specifically, in this embodiment, the preset temperature value is greater than or equal to the target difference, and the preset temperature value can be set to 3°C according to experience. Specifically, due to the temperature difference between the inside and the surface of the outdoor heat exchanger of the heat pump air-conditioning system, in order to fully ensure that the surface temperature of the outdoor heat exchanger of the heat pump air-conditioning system is greater than 0°C and will not frost, the value of the preset temperature value is preferentially set to 3°C in this embodiment. That is, when the temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system after heating is greater than or equal to 3°C, it can well prevent the surface of the outdoor heat exchanger of the heat pump air-conditioning system from frosting in advance.

[0082] In one embodiment, the initial temperature and the heated temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system are obtained by collecting through a temperature sensor arranged at the coolant inlet of the outdoor heat exchanger. That is, by arranging a coolant temperature sensor at the coolant inlet of the outdoor heat exchanger, the initial temperature and the heated temperature of the coolant in the outdoor heat exchanger are collected. When the initial temperature of the coolant is lower than the dew point temperature of the outside air, it means that the surface of the outdoor heat exchanger is more likely to frost; and the frosting temperature value = the dew point temperature of the outside air - the initial temperature of the coolant. When the frosting temperature value is greater than or equal to 0°C, frosting will occur. Among them, the temperature sensor for collecting the coolant temperature can be implemented by using existing temperature sensors well-known to those skilled in the art, and details are not described herein again.

[0083] In one embodiment, it further includes:

[0084] The dew point temperature of the outside air is obtained by looking up an air temperature - air humidity - dew point temperature conversion table. That is, the dew point temperature of the outside air can be quickly found through the air temperature - air humidity - dew point temperature conversion table; among them, the method for obtaining the air temperature - air humidity - dew point temperature conversion table includes: collecting the air temperature, air humidity and dew point temperature, and establishing the correlation relationship between the air temperature, air humidity and dew point temperature to obtain the air temperature - air humidity - dew point temperature conversion table.

[0085] In one embodiment, it further includes:

[0086] The air temperature and air humidity are obtained by collecting through a temperature and humidity sensor arranged on the surface of the outdoor heat exchanger, that is, by arranging an external temperature and humidity sensor on the surface of the outdoor heat exchanger to collect the air temperature and air humidity, and then the dew point temperature of the external air can be found through the air temperature - air humidity - dew point temperature comparison table. Among them, the temperature and humidity sensor can specifically be implemented by using existing temperature and humidity sensors well-known to those skilled in the art, and details are not described herein again.

[0087] In one implementation, for the first preset safety threshold and the second preset safety threshold, those skilled in the art can verify through vehicle tests, and confirm by observing the change of the frosting temperature value and the frosting time on the surface of the outdoor heat exchanger according to the ambient temperature, ambient humidity, and the required temperature of the heated coolant. Such a confirmation process is relatively easy to implement for those skilled in the art; of course, the first preset safety threshold and the second preset safety threshold can also be set according to the actual working conditions.

[0088] So far, those skilled in the art should understand that each functional module in the above-mentioned electric vehicle heat pump air conditioning system control device can be implemented in whole or in part by software, hardware, and their combination, and the above-mentioned functional modules can be embedded in the processor in the computer device in hardware form or be independent of it, or can be stored in the memory of the computer device in software form, so that the processor can call and execute the operations corresponding to the above-mentioned modules.

[0089] In one implementation, a computer device is provided. The computer device can be a terminal, and its internal structure diagram is well-known to those skilled in the art. The computer device includes a processor, a memory, a network interface, a display, and an input device connected through a system bus. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program, and the internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The network interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, it realizes an electric vehicle heat pump air conditioning system control method. The display of the computer device can be a liquid crystal display or an electronic ink display. The input device of the computer device can be a touch layer covering the display, or a button or a touchpad set on the shell of the computer device, or an external keyboard, touchpad, or mouse, etc.

[0090] As yet another specific embodiment, the present invention provides a computer device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the following steps are realized:

[0091] Obtain the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system and the dew point temperature of the outside air, and obtain the difference between the dew point temperature of the outside air minus the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system to obtain a first trigger temperature value;

[0092] When the whole vehicle performs heat pump heating, if the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system is less than or equal to the water vapor frost point temperature (for example, the water vapor frost point temperature is 0°C), and the first trigger temperature value is greater than or equal to a first preset safety threshold, start the motor to heat the coolant in the outdoor heat exchanger of the heat pump air-conditioning system to increase the coolant temperature to turn on the anti-frost function;

[0093] Obtain the temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system after heating, and obtain a second trigger temperature value according to the difference between the temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system after heating minus the dew point temperature of the outside air;

[0094] When the temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system after heating is greater than or equal to a preset temperature value, or the second trigger temperature value is greater than or equal to a second preset safety threshold, then stop the motor from heating the coolant in the outdoor heat exchanger of the heat pump air-conditioning system.

[0095] For other specific limitations regarding the computer device, please refer to the description of the control method for the electric vehicle heat pump air-conditioning system in the above text, which will not be elaborated here.

[0096] As another specific embodiment, the present invention provides a computer-readable storage medium, in which a computer program is stored, and when the computer program is executed by a processor, the following steps are implemented:

[0097] Obtain the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system and the dew point temperature of the outside air, and obtain the difference between the dew point temperature of the outside air minus the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system to obtain a first trigger temperature value;

[0098] When the whole vehicle performs heat pump heating, if the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system is less than or equal to the water vapor frost point temperature (for example, the water vapor frost point temperature is 0°C), and the first trigger temperature value is greater than or equal to a first preset safety threshold, start the motor to heat the coolant in the outdoor heat exchanger of the heat pump air-conditioning system to increase the coolant temperature to turn on the anti-frost function;

[0099] Obtain the temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system after heating, and obtain a second trigger temperature value according to the difference between the temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system after heating minus the dew point temperature of the outside air;

[0100] When the temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system is greater than or equal to the preset temperature value after heating, or when the second trigger temperature value is greater than or equal to the second preset safety threshold, the motor stops heating the coolant in the outdoor heat exchanger of the heat pump air-conditioning system.

[0101] For specific limitations on other computer-readable storage media, please refer to the description of the control method of the electric vehicle heat pump air-conditioning system in the above text, which will not be elaborated here.

[0102] Those of ordinary skill in the art can understand that any reference to a memory, storage medium, or database in the above embodiments of the present application may include non-volatile and / or volatile memories. Non-volatile memories may include read-only memory (ROM), programmable ROM (PROM), electrically programmable ROM (EPROM), electrically erasable programmable ROM (EEPROM), or flash memory. Volatile memories may include random access memory (RAM) or external cache memory. By way of illustration and not limitation, RAM can be obtained in various forms, such as static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), synchronous link DRAM (SLDRAM), memory bus direct RAM (RDRAM), enhanced SDRAM (ESDRAM), and direct memory bus dynamic RAM (DRDRAM), etc.

[0103] Compared with the prior art, the control method, device, equipment and storage medium of the electric vehicle heat pump air conditioning system provided by the present invention obtain the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system and the dew point temperature of the external air, and use the difference between the dew point temperature of the external air and the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system as the first trigger temperature value; when the vehicle performs heat pump heating, if the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system is less than or equal to the water vapor frost point temperature, and the first trigger temperature value is greater than or equal to the first preset safety threshold, the motor is started to heat the coolant to increase the coolant temperature to turn on the anti-frost function; the temperature of the coolant after heating in the outdoor heat exchanger of the heat pump air conditioning system is obtained, and the difference between the temperature of the coolant after heating in the outdoor heat exchanger of the heat pump air conditioning system and the dew point temperature of the external air is used as the second trigger temperature value; when the temperature of the coolant after heating in the outdoor heat exchanger of the heat pump air conditioning system is greater than or equal to the preset temperature value, or the second trigger temperature value is greater than or equal to the second preset safety threshold, the motor heating of the coolant in the outdoor heat exchanger of the heat pump air conditioning system is exited. Based on the existing system architecture of the company that uses the electric drive coolant temperature for heat exchange and the motor to heat the coolant temperature during heat pump heating, when performing heat pump heating, the first preset safety threshold and the relatively low initial temperature of the coolant are used to judge whether the surface of the outdoor heat exchanger is frosted, and the measure of starting the motor to heat the coolant is used to quickly increase the coolant temperature to prevent the surface of the outdoor heat exchanger from frosting during heat pump heating, and the coolant temperature is quickly increased by the motor heating power corresponding to different frost formation temperature values. When the second preset safety threshold is reached or the temperature of the coolant after heating is relatively high, the motor heating is exited. Therefore, the frosting on the surface of the outdoor heat exchanger can be prevented in advance, which is applicable to idling and driving processes, ensuring the normal operation of the system.

[0104] 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 preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be modified or equivalently replaced without departing from the spirit and scope of the technical solutions of the present invention, and they should all be covered by the scope of the claims of the present invention.

Claims

1. Control method for electric vehicle heat pump air conditioning system, characterized in that, Including: Obtain the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system and the dew point temperature of the outside air, and obtain the difference between the dew point temperature of the outside air minus the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system to obtain a first trigger temperature value; When the vehicle performs heat pump heating, if the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system is less than or equal to the water vapor frost point temperature, and the first trigger temperature value is greater than or equal to a first preset safety threshold, obtain the mapping relationship between the frost formation temperature value and the motor heating power; according to the mapping relationship between the frost formation temperature value and the motor heating power and the first trigger temperature value, obtain the target motor heating power; based on the target motor heating power, start the motor to heat the coolant in the outdoor heat exchanger of the heat pump air-conditioning system to increase the coolant temperature, and the frost formation temperature value is the difference between the dew point temperature of the outside air and the initial temperature of the coolant; Obtain the temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system after heating, and obtain a second trigger temperature value according to the difference between the temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system after heating minus the dew point temperature of the outside air; When the temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system after heating is greater than or equal to a preset temperature value, or the second trigger temperature value is greater than or equal to a second preset safety threshold, then stop the motor from heating the coolant in the outdoor heat exchanger of the heat pump air-conditioning system.

2. The control method of the electric vehicle heat pump air conditioning system according to claim 1, characterized in that, The obtaining of the mapping relationship between the frost formation temperature value and the motor heating power includes: Obtain a plurality of target frost formation temperature values, where the target frost formation temperature value is the difference between the coolant temperature in the outdoor heat exchanger and the dew point temperature of the outside air, and the target frost formation temperature value includes the first trigger temperature value; Obtain the minimum heating power required to complete defrosting for each of the target frost formation temperature values within a preset defrosting time to obtain the motor heating power corresponding to the target frost formation temperature value; Establish the mapping relationship between the frost formation temperature value and the motor heating power according to the plurality of target frost formation temperature values and the motor heating power corresponding to the target frost formation temperature value.

3. The control method of the electric vehicle heat pump air conditioning system according to claim 1, characterized in that, The method further includes: Obtain the difference between the surface temperature of the outdoor heat exchanger of the heat pump air-conditioning system and the internal temperature of the outdoor heat exchanger of the heat pump air-conditioning system to obtain a target difference; Set the preset temperature value according to the target difference.

4. The control method of the electric vehicle heat pump air conditioning system according to claim 1, wherein, The obtaining of the initial temperature and the heated temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system is obtained by collecting through a temperature sensor arranged at the coolant inlet of the outdoor heat exchanger.

5. The control method of the electric vehicle heat pump air conditioning system according to claim 1, characterized in that, The obtaining of the dew point temperature of the outside air is obtained by looking up in an air temperature - air humidity - dew point temperature conversion table.

6. The control method of the electric vehicle heat pump air conditioning system according to claim 5, wherein The air temperature and air humidity are obtained by collecting through a temperature and humidity sensor arranged on the surface of the outdoor heat exchanger.

7. Control device for electric vehicle heat pump air conditioning system, characterized in that, Including: A first trigger temperature value obtaining module, configured to obtain the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system and the dew point temperature of the outside air, and obtain the difference between the dew point temperature of the outside air minus the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air-conditioning system to obtain a first trigger temperature value; The heating startup module is used to obtain the mapping relationship between the frosting temperature value and the motor heating power when the whole vehicle performs heat pump heating and the initial temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system is less than or equal to the water vapor frost point temperature and the first trigger temperature value is greater than or equal to the first preset safety threshold; obtain the target motor heating power according to the mapping relationship between the frosting temperature value and the motor heating power and the first trigger temperature value; based on the target motor heating power, start the motor to heat the coolant in the outdoor heat exchanger of the heat pump air conditioning system to increase the coolant temperature, and the frosting temperature value is the difference between the outdoor air dew point temperature and the initial temperature of the coolant. The second trigger temperature value acquisition module is used to acquire the temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system after heating and obtain the second trigger temperature value according to the difference between the temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system after heating and the outdoor air dew point temperature. The heating exit module is used to exit the motor from heating the coolant in the outdoor heat exchanger of the heat pump air conditioning system when the temperature of the coolant in the outdoor heat exchanger of the heat pump air conditioning system after heating is greater than or equal to the preset temperature value or the second trigger temperature value is greater than or equal to the second preset safety threshold.

8. A computer device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps in the control method of the electric vehicle heat pump air conditioning system according to any one of claims 1 to 6.

9. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the steps in the control method of the electric vehicle heat pump air conditioning system according to any one of claims 1 to 6.

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