Demisting control method for new energy automobile, storage medium and electronic equipment

Abstract

According to the new energy automobile demisting control method, the storage medium and the electronic equipment provided by the invention, when the acquired required heating temperature of the automobile cabin is higher than the current temperature of the automobile cabin, the heat pump and the water heater are not directly started, and the environment temperature and the environment temperature drop rate of the environment where the new energy automobile is located are further acquired; if the environment temperature drop rate is larger than the set change threshold value, the environment temperature drops suddenly, and the residual water content on the surface of the evaporator is further obtained at the moment. If the environment temperature is lower than the set temperature threshold value and the water content is higher than the first water content threshold value, the heat pump heating is controlled to be closed, and the water heater is started. The heat pump heating loop is closed, the water heater is used for achieving the heating function, the temperature in the automobile cabin is increased so as to eliminate mist generated on the front windshield due to the large temperature difference between the inside and the outside, and meanwhile it can be avoided that the heat pump heating efficiency is affected by low temperature and secondary fogging is generated by residual water on the surface of the evaporator.

Description

Technical Field

[0001] The present application relates to the field of thermal management technology for new energy vehicles, and specifically, to a defogging control method, storage medium, and electronic equipment for new energy vehicles. Background Art

[0002] During the driving of new energy vehicles, the large temperature difference between the inside and outside of the vehicle in winter can easily cause the windshield to fog up. To eliminate fogged windshields, traditional models rely on a heat pump and a water heater working together to increase the cabin temperature and eliminate fog. If the ambient temperature drops rapidly to a low value, and residual moisture remains on the evaporator surface due to previous cooling / dehumidification modes, the traditional use of heat pumps and water heaters to raise the cabin temperature is less effective. This is because the heat pump's heating efficiency is significantly reduced in low-temperature environments. In addition, low temperatures can easily cause the residual moisture in the evaporator to frost or ice, resulting in airflow obstruction, delayed heating, and even secondary fogging of the windshield. Summary of the Invention

[0003] The technical problem to be solved by this application is that in the existing technology, new energy vehicles have low heating efficiency and poor demisting control effect when the ambient temperature drops suddenly and there is residual moisture on the evaporator surface. Therefore, a demisting control method, storage medium and electronic equipment for new energy vehicles are provided.

[0004] In a first aspect, the technical solution of the present application provides a new energy vehicle defogging control method, comprising:

[0005] Obtain the required cabin heating temperature and the current cabin temperature;

[0006] If the cabin heating demand temperature is higher than the current cabin temperature, obtaining the ambient temperature and the ambient temperature drop rate of the environment where the new energy vehicle is located;

[0007] If the ambient temperature drop rate is greater than a set change threshold, the residual water content on the evaporator surface is obtained;

[0008] If the ambient temperature is lower than the set temperature threshold and the water content is higher than the first water content threshold, the heat pump heating circuit is controlled to be closed and the water heater is turned on.

[0009] Preferably, the new energy vehicle demisting control method further comprises: if the ambient temperature is lower than a set temperature threshold and the water content is higher than a first water content threshold;

[0010] The internal circulation damper is controlled to open while the water heater is turned on.

[0011] Preferably, the new energy vehicle defogging control method further includes:

[0012] Monitor windshield humidity;

[0013] If the humidity of the front windshield exceeds the safety humidity threshold, the heat pump heating circuit is controlled to start the dehumidification mode for a specific time period, and the specific time period is less than the safety time period threshold.

[0014] Preferably, in the new energy vehicle demisting control method, obtaining the residual water content on the evaporator surface includes:

[0015] Obtaining the duration of the previous cooling / dehumidification mode of the evaporator;

[0016] Get the humidity in the cabin;

[0017] The residual water content on the evaporator surface is determined according to an integral operation result of a product of the vehicle cabin humidity, a preset water content attenuation coefficient, and a preset evaporator temperature influence function within the duration.

[0018] Preferably, the new energy vehicle demisting control method obtains the evaporator temperature influence function by the following method:

[0019] Controlling the evaporator to operate in a cooling / dehumidification mode and monitoring the surface temperature and inlet air temperature of the evaporator;

[0020] When the surface temperature is at different temperature points and the inlet air temperature is at different temperature points, obtaining the amount of water on the evaporator surface corresponding to each surface temperature point and each inlet air temperature point;

[0021] The preset evaporator temperature influence function is obtained by fitting according to the corresponding relationship between different surface temperature points, different air inlet temperature points and the amount of water on the evaporator surface.

[0022] Preferably, the new energy vehicle defogging control method further includes:

[0023] Obtaining the running time of the water heater;

[0024] If the operating time is greater than a set time, the ambient temperature reaches or exceeds the set temperature threshold, the humidity in the vehicle cabin is less than a set humidity threshold, and the water content is less than a second water content threshold, the heat pump heating circuit is controlled to open, and the heat pump heating ratio is adjusted according to the ambient temperature; wherein the second water content threshold is less than the first water content threshold.

[0025] Preferably, in the new energy vehicle demisting control method, the heat pump heating ratio is adjusted according to the ambient temperature:

[0026] The heat pump heating ratio is adjusted according to the set gradient ratio.

[0027] In a second aspect, the technical solution of the present application provides a computer-readable storage medium, in which program information is stored. After the computer reads the program information, it executes the steps of the new energy vehicle defogger control method described in any one of the technical solutions of the first aspect.

[0028] In a third aspect, the technical solution of the present application provides a computer program product, including a computer program / instruction, characterized in that when the computer program / instruction is executed by a processor, the steps of the new energy vehicle defogger control method described in any technical solution of the first aspect are implemented.

[0029] In a fourth aspect, the technical solution of the present application provides an electronic device comprising a memory, a processor and a computer program stored in the memory, wherein the processor executes the computer program to implement the steps of the new energy vehicle defogger control method described in any one of the technical solutions of the first aspect.

[0030] Compared with the existing technology, the above technical solution provided by this application has the following technical effects:

[0031] The new energy vehicle defogger control method, storage medium, and electronic device provided by the present application do not directly start the heat pump and water heater when the acquired cabin heating demand temperature is higher than the current cabin temperature. Instead, the ambient temperature of the environment in which the new energy vehicle is located and the rate of decrease of the ambient temperature are further acquired. If the rate of decrease of the ambient temperature is greater than the set change threshold, it indicates that the ambient temperature has dropped sharply. At this time, the residual water content on the surface of the evaporator is further acquired. If the ambient temperature is lower than the set temperature threshold and the water content is higher than the first water content threshold, the heat pump heating is controlled to be turned off and the water heater is turned on. The heat pump heating circuit is turned off and the water heater is used to perform the heating function, so that the temperature in the cabin is increased to eliminate the fog on the front windshield caused by the large temperature difference between the inside and the outside. At the same time, it can prevent the heat pump heating efficiency from being affected by the low temperature and the residual water on the evaporator surface from causing secondary fogging. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 This is a flow chart of a new energy vehicle defogging control method according to an embodiment of the present application;

[0033] Figure 2 This is a flow chart of the steps for obtaining the residual water content on the surface of the evaporator according to one embodiment of the present application;

[0034] Figure 3 A schematic diagram of a surface showing the corresponding relationship between the amount of water on the evaporator surface, the evaporator surface temperature, and the inlet air temperature according to an embodiment of the present application;

[0035] Figure 4 This is a schematic diagram of the hardware connection relationship of the electronic device that executes the new energy vehicle defogger control method described in an embodiment of the present application. DETAILED DESCRIPTION

[0036] The specific implementation of this application is further described below with reference to the accompanying drawings.

[0037] It is easy to understand that according to the technical solution of this application, a variety of structural methods and implementation methods can be replaced with each other by those skilled in the art without changing the essential spirit of this application. Therefore, the following specific embodiments and drawings are only exemplary descriptions of the technical solution of this application and should not be regarded as the entire application or as a limitation or restriction of the technical solution of the application.

[0038] This embodiment provides a new energy vehicle defogging control method, which can be applied to a vehicle controller of a new energy vehicle or other control units with control functions of a new energy vehicle, such as Figure 1 As shown, the method includes:

[0039] S100: Obtaining the required cabin heating temperature and the current cabin temperature.

[0040] The cabin heating demand is the target temperature input by the user, and the current cabin temperature can be monitored by the temperature sensor inside the vehicle.

[0041] S200: Determine whether the required cabin heating temperature is higher than the current cabin temperature.

[0042] By comparing the required cabin heating temperature with the current cabin temperature, it is determined which of the two temperatures is higher. If the required cabin heating temperature is higher than the current cabin temperature, then step S300 is executed, otherwise, the process returns to step S100.

[0043] S300: Obtaining the ambient temperature and the ambient temperature drop rate of the environment where the new energy vehicle is located.

[0044] The ambient temperature can be monitored using an external temperature sensor installed on the vehicle. The ambient temperature drop rate is the temperature drop over a period divided by the time period. For example, if the temperature drops by 6°C over 5 minutes, the drop rate is 1.2°C / minute.

[0045] S400: Determine whether the ambient temperature drop rate is greater than a set change threshold.

[0046] The change threshold can be set according to the actual situation of the new energy vehicle, and can usually be selected as 2°C / minute, and an upper and lower floating range can be set. If the ambient temperature drop rate is greater than the set change threshold, step S500 is executed, otherwise return to step S100.

[0047] S500: Obtain the residual water content on the evaporator surface.

[0048] The water content can be directly expressed by detecting the thickness of the water film remaining on the surface of the evaporator. Alternatively, the water mass can be calculated based on the water film thickness, the water film coverage area and the water density. The water content can then be obtained by dividing the water mass by the water film coverage area to obtain the water mass per unit area (g / m2).

[0049] S600: Determine whether the ambient temperature is lower than a set temperature threshold and whether the water content is higher than a first water content threshold.

[0050] The set temperature threshold usually corresponds to the temperature value at which the heat pump heating circuit can operate normally and exert a heating effect. In this solution, 0°C is selected.

[0051] The first water content threshold has the same dimension as the water content. For example, if the water content is expressed as the thickness of the water film, the first water content threshold is also expressed as thickness. The first water content threshold can be set according to the actual situation of the new energy vehicle and is a fixed value. For example, if the water content is expressed as the water mass per unit area, the first water content threshold can be selected as 50g / m 2 If the ambient temperature is lower than the set temperature threshold and the water content is higher than the first water content threshold, then step S700 is executed, otherwise, the process returns to step S100.

[0052] S700: Controls the heat pump heating circuit to close and the water heater to open.

[0053] That is, when the ambient temperature is too low to affect the heating efficiency of the heat pump heating circuit, and there is a lot of residual water on the evaporator surface, which is easy to cause heating delay and secondary fogging when freezing at low temperatures, this solution first shuts down the heat pump heating circuit and directly activates the water heater to dominate the heating, avoiding the risk of frost and fogging caused by the inefficient operation of the heat pump at low temperatures.

[0054] In the solution provided in this embodiment, when the acquired cabin heating demand temperature is higher than the current cabin temperature, the heat pump and water heater are not directly activated. Instead, the ambient temperature and the rate of decrease of the ambient temperature in the new energy vehicle's environment are further acquired. If the rate of decrease exceeds a set temperature change threshold, indicating a sudden drop in the ambient temperature, the residual water content on the evaporator surface is further acquired. If the ambient temperature is lower than the set temperature threshold and the water content is higher than a first water content threshold, the heat pump heating is shut off and the water heater is activated. The heat pump heating circuit is shut off, allowing the water heater to perform heating functions, raising the cabin temperature to eliminate fogging on the windshield caused by the large temperature difference between inside and outside. This also prevents the heat pump heating efficiency from being affected by low temperatures and secondary fogging caused by residual water on the evaporator surface.

[0055] Furthermore, the new energy vehicle defogging control method further includes, in step S700, controlling the internal circulation damper to open simultaneously with the water heater. In this embodiment, the internal circulation damper is opened simultaneously with the water heater operation to reduce the ingress of high-humidity external air and further suppress fog formation.

[0056] Preferably, the new energy vehicle defogging control method further comprises the following steps:

[0057] S800: Monitors windshield humidity.

[0058] This step can be monitored by a sensor disposed on or near the front windshield.

[0059] S900: If the humidity of the front windshield exceeds a safety humidity threshold, control the heat pump heating circuit to start a dehumidification mode for a specific time period, where the specific time period is less than a safety time period threshold.

[0060] The safe humidity threshold corresponds to situations where fog affects vision and can be determined after testing based on actual conditions. The specific duration must be shorter than the safe duration threshold. The safe duration threshold is set based on empirical values ​​to prevent secondary fogging, for example, 30 seconds. In this solution, if fog on the windshield could affect vision, to avoid affecting safe driving, the heat pump heating circuit can be briefly turned on and operated in dehumidification mode to first reduce the moisture on the windshield. The heat pump heating circuit is then immediately turned off, and heating continues using the water heater to achieve dynamic humidity balance.

[0061] Preferably, in the above scheme, Figure 2 As shown, the residual water content on the evaporator surface is obtained by the following methods, including:

[0062] S501: Obtain the duration of the previous cooling / dehumidification mode of the evaporator.

[0063] The vehicle controller can monitor the operating status parameters of the evaporator in real time, so it can obtain the duration of each cooling / dehumidification mode of the evaporator. After obtaining the above parameters, the start time t1 and end time t2 of the cooling / dehumidification mode are recorded respectively.

[0064] S502: Obtain the humidity in the vehicle cabin.

[0065] The humidity is monitored in real time by the humidity sensor in the cabin and is expressed as RH (unit: %).

[0066] S503: Determine the residual water content on the evaporator surface according to an integral operation result of the product of the cabin humidity, the preset water content attenuation coefficient, and the preset evaporator temperature influence function within the duration.

[0067] This step is represented by the following algorithm:

[0068] Q represents the residual water content on the evaporator surface, (t1→t2) is the time integration range, RH is the cabin humidity, f(T_evap) is the evaporator temperature influence function, dt is the time differential, and the integration time step (in seconds) corresponds to the ambient temperature sensor sampling frequency. k is the attenuation coefficient, an empirical constant (dimensionless) used to correct model errors and reflect the influence of factors such as evaporator material, surface roughness, and airflow distribution on residual water. As shown above, the lower the evaporator surface temperature, the easier it is to break the dew point, the faster the condensation water generation rate, and the larger the f(T_evap) value. This algorithm can quickly and accurately calculate the residual water content on the evaporator surface.

[0069] Furthermore, the evaporator temperature influence function is obtained as follows:

[0070] S5001: Control the evaporator to operate in a cooling / dehumidification mode, and monitor the surface temperature and inlet air temperature of the evaporator.

[0071] S5002: When the surface temperature is at different temperature points and the inlet air temperature is at different temperature points, the amount of water on the evaporator surface corresponding to each surface temperature point and each inlet air temperature point is obtained.

[0072] S5003: According to the correspondence between different surface temperature points, different air inlet temperature points and the amount of water on the evaporator surface, the preset evaporator temperature influence function is obtained by fitting.

[0073] In specific implementation, the fitted surface is as follows Figure 3 As shown, the curve can be expressed as the algorithm expression for calculating the residual water content Q on the evaporator surface, or Figure 3 The coordinates of each point on the mid-surface are expressed as shown in Table 1:

[0074] Table 1 Correspondence between surface temperature point, air inlet temperature point and evaporator surface water volume

[0075]

[0076] The first vertical column in Table 1 records the different temperature points on the evaporator surface, and the first horizontal row records the different inlet air temperature points. The data recorded in Table 1 is limited. In practical applications, the amount of data can be selected according to actual needs. Once the evaporator surface temperature and the inlet air temperature are determined, the water volume on the evaporator surface can be directly determined by querying Table 1.

[0077] Preferably, the new energy vehicle defogging control method further includes:

[0078] S1000: Acquire the operating time of the water heater.

[0079] The vehicle controller can monitor the operating status of the water heater, so the operating time of the water heater can be directly obtained.

[0080] S1100: If the operating time is greater than the set time, the ambient temperature reaches or exceeds the set temperature threshold, the humidity in the cabin is less than the set humidity threshold, and the water content is lower than the second water content threshold, the heat pump heating circuit is controlled to open, and the heat pump heating ratio is adjusted according to the ambient temperature; wherein, the second water content threshold is less than the first water content threshold.

[0081] The fact that the ambient temperature reaches or exceeds the set temperature threshold indicates that the heat pump heating circuit can operate normally. The set duration is determined based on empirical values, and it is sufficient to increase the cabin temperature from the initial temperature and effectively reduce the residual water content on the evaporator surface. For example, the set duration is selected as 10 minutes. The set humidity threshold is determined based on empirical values, for example, 40%. The second water content threshold is less than the first water content threshold. For example, if the first water content threshold is 50g / m2, the second water content threshold is selected to be ≤30g / m2, indicating that the surface humidity of the evaporator has dropped to a safe range, and the risk of frost is controllable when the heat pump heating is reactivated.

[0082] The above solution combines the detection of sudden drops in ambient temperature with the prediction of residual moisture in the evaporator, overcoming the limitation of traditional heat pump control that relies solely on real-time temperature and humidity. It proactively avoids the risks of frost and secondary fogging while ensuring heating needs. This solution is particularly suitable for scenarios with frequent temperature and humidity changes caused by short trips out of warm storage in winter.

[0083] Furthermore, in the aforementioned solution, step S1100 of adjusting the heat pump heating ratio according to the ambient temperature involves adjusting the heat pump heating ratio according to a set gradient ratio. In this solution, a gradient switching strategy is set for the heat pump heating circuit, for example, transferring the heat load to the heat pump at a rate of 5% / second to prevent temperature fluctuations from affecting the user experience.

[0084] An embodiment of the present application also provides a computer-readable storage medium, in which program information is stored. After the computer reads the program information, the computer executes the steps of the new energy vehicle defogger control method described in any of the above solutions.

[0085] An embodiment of the present application also provides a computer program product, including a computer program / instruction, characterized in that when the computer program / instruction is executed by a processor, the steps of the new energy vehicle defogger control method described in any of the above solutions are implemented.

[0086] The present application also provides an electronic device, such as Figure 4 As shown, the electronic device includes at least one processor 41 and at least one memory 42. At least one memory 42 stores program information. After reading the program information, the at least one processor 41 executes the steps of the new energy vehicle defogging control method described in any of the above method embodiments. The device may also include an input device 43 and an output device 44. The processor 41, memory 42, input device 43, and output device 44 are communicatively connected. Memory 42, as a non-volatile computer-readable storage medium, can be used to store non-volatile software programs, non-volatile computer executable programs, and modules. By running the non-volatile software programs, instructions, and modules stored in memory 42, the processor 41 executes various functional applications and processes data, thereby implementing the steps of the new energy vehicle defogging control method provided in any of the above methods. Memory 42 may include a program storage area and a data storage area. The program storage area may store an operating system and at least one application required for the function; the data storage area may store data generated by the steps of the new energy vehicle defogging control method. In addition, the memory 42 may include a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk storage device, a flash memory device, or other non-volatile solid-state storage device. In some embodiments, the memory 42 may optionally include a memory remotely located relative to the processor 41, and these remote memories may be connected to a device for executing the steps of the new energy vehicle defogger control method via a network. Examples of the above-mentioned network include but are not limited to the Internet, corporate intranet, local area network, mobile communication network and a combination thereof. The input device 43 may receive input user clicks, and generate signal inputs related to user settings and function controls of the steps of the new energy vehicle defogger control method. The output device 44 may include a display device such as a display screen. When the one or more modules are stored in the memory 42 and are executed by the one or more processors 41, the steps of the new energy vehicle defogger control method in any of the above-mentioned method embodiments are executed.

[0087] As needed, the above technical solutions can be combined to achieve the best technical effect.

[0088] The above are only the principles and preferred embodiments of the present application. It should be noted that, for those skilled in the art, on the basis of the principles of the present application, several other modifications can be made, which should also be considered as the scope of protection of the present application.

Claims

1. A new energy vehicle defogging control method, characterized in that: include: Obtain the required cabin heating temperature and the current cabin temperature; If the cabin heating demand temperature is higher than the current cabin temperature, obtaining the ambient temperature and the ambient temperature drop rate of the environment where the new energy vehicle is located; If the ambient temperature drop rate is greater than a set change threshold, the residual water content on the evaporator surface is obtained; If the ambient temperature is lower than the set temperature threshold and the water content is higher than the first water content threshold, the heat pump heating circuit is controlled to be closed and the water heater is turned on.

2. The new energy vehicle defogging control method according to claim 1, characterized in that: If the ambient temperature is lower than the set temperature threshold and the water content is higher than a first water content threshold, the method further includes: The internal circulation damper is controlled to open while the water heater is turned on.

3. The new energy vehicle defogging control method according to claim 1, characterized in that: Also includes: Monitor windshield humidity; If the humidity of the front windshield exceeds the safety humidity threshold, the heat pump heating circuit is controlled to start the dehumidification mode for a specific time period, and the specific time period is less than the safety time period threshold.

4. The new energy vehicle defogging control method according to claim 1, characterized in that: The step of obtaining the residual water content on the surface of the evaporator comprises: Obtaining the duration of the previous cooling / dehumidification mode of the evaporator; Get the humidity in the cabin; The residual water content on the evaporator surface is determined according to an integral operation result of a product of the vehicle cabin humidity, a preset water content attenuation coefficient, and a preset evaporator temperature influence function within the duration.

5. The new energy vehicle defogging control method according to claim 4, characterized in that: The evaporator temperature influence function is obtained as follows: Controlling the evaporator to operate in a cooling / dehumidification mode and monitoring the surface temperature and inlet air temperature of the evaporator; When the surface temperature is at different temperature points and the inlet air temperature is at different temperature points, obtaining the amount of water on the evaporator surface corresponding to each surface temperature point and each inlet air temperature point; The preset evaporator temperature influence function is obtained by fitting according to the corresponding relationship between different surface temperature points, different air inlet temperature points and the amount of water on the evaporator surface.

6. The new energy vehicle defogging control method according to claim 4 or 5, characterized in that: Also includes: Obtaining the running time of the water heater; If the operating time is greater than a set time, the ambient temperature reaches or exceeds the set temperature threshold, the humidity in the vehicle cabin is less than a set humidity threshold, and the water content is less than a second water content threshold, the heat pump heating circuit is controlled to open, and the heat pump heating ratio is adjusted according to the ambient temperature; wherein the second water content threshold is less than the first water content threshold.

7. The new energy vehicle defogging control method according to claim 6, characterized in that: In the step of adjusting the heat pump heating ratio according to the ambient temperature: The heat pump heating ratio is adjusted according to the set gradient ratio.

8. A computer-readable storage medium, characterized in that The storage medium stores program information, and the computer reads the program information and executes the steps of the new energy vehicle defogger control method according to any one of claims 1 to 7.

9. A computer program product, characterized in that It includes a computer program / instruction, characterized in that when the computer program / instruction is executed by a processor, the steps of the new energy vehicle defogger control method described in any one of claims 1 to 7 are implemented.

10. An electronic device comprising a memory, a processor, and a computer program stored in the memory, wherein: The processor executes the computer program to implement the steps of the new energy vehicle defogger control method according to any one of claims 1 to 7.

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