Vehicle evaporator temperature detection method and device, vehicle, and storage medium

Abstract

The application relates to a temperature detection method and device of a vehicle evaporator, a vehicle and a storage medium, wherein the method comprises the following steps: obtaining an evaporator temperature of a vehicle evaporator; in the case that the evaporator temperature is less than or equal to a preset temperature and the number of times that the evaporator temperature is less than or equal to the preset temperature reaches a preset number of times, calculating a temperature difference value between the evaporator temperature and a low-pressure refrigerant corresponding saturated temperature, and judging whether the temperature difference value is greater than a first preset threshold value; if the temperature difference value is greater than the first preset threshold value, correcting the evaporator temperature according to a low-pressure refrigerant corresponding evaporating temperature to obtain an actual temperature of the evaporator. Thus, the technical problem that, in the related art, an evaporator sensor is easily affected by environmental factors, leading to evaporator temperature failure and affecting compressor control, and that arranging multiple sensors is high in cost and not conducive to popularization and application is solved.

Description

Technical Field

[0001] The present application relates to the technical field of evaporators, and in particular to a temperature detection method, device, vehicle, and storage medium for a vehicle evaporator. Background Art

[0002] Currently, the most core compressor speed control in air-conditioning refrigeration control mostly relies on the sensor signal of the actual evaporator temperature. However, the evaporator temperature is limited by the layout location or HVAC operating conditions, and abnormal error values ​​may appear under specific conditions. For example, under low load (ambient temperature is not very high) and high humidity (rain, heavy fog), a large amount of water droplets may condense on the evaporator, contaminating the evaporator temperature sensor and making its temperature measurement invalid. The measured temperature data is higher than the actual evaporator temperature. At this time, increasing the compressor speed will cause the evaporator to freeze at best, and the compressor suction state will deteriorate at worst, causing abnormal noise or even damage.

[0003] In the related art, the evaporator temperature sensor can be arranged in a special form to prevent contamination by condensed water; or, multiple sensors can be arranged on the evaporator to prevent a single sensor from failing and causing control abnormalities.

[0004] However, in the related art, directly using the evaporator sensor readings can only diagnose short circuits and opening failures. When the sensor is affected by environmental factors, such as being stained by water droplets, the obtained evaporator temperature will become invalid, resulting in abnormal compressor control. The arrangement of multiple sensors is costly and not conducive to promotion and application, and needs to be improved. Summary of the Invention

[0005] The present application provides a vehicle evaporator temperature detection method, device, vehicle and storage medium to solve the technical problems in related technologies, that is, the evaporator sensor is easily affected by environmental factors, resulting in evaporator temperature failure, thereby affecting compressor control, and the arrangement of multiple sensors is costly and not conducive to promotion and application.

[0006] A first aspect of the present application provides a method for detecting the temperature of a vehicle evaporator, comprising the following steps: obtaining the evaporator temperature of the vehicle evaporator; when the evaporator temperature is less than or equal to a preset temperature, and the number of times the evaporator temperature is less than or equal to the preset temperature reaches a preset number, calculating the temperature difference between the evaporator temperature and the saturation temperature corresponding to the refrigerant low pressure, and determining whether the temperature difference is greater than a first preset threshold; if the temperature difference is greater than the first preset threshold, correcting the evaporator temperature according to the evaporation temperature corresponding to the refrigerant low pressure to obtain the actual temperature of the evaporator.

[0007] Optionally, in one embodiment of the present application, before calculating the temperature difference between the evaporator temperature and the saturation temperature corresponding to the refrigerant low pressure, it also includes: when the evaporator temperature is less than or equal to the preset temperature, accumulating the current counter value until the accumulated value of the counter value reaches the preset number of times, and calculating the temperature difference.

[0008] Optionally, in one embodiment of the present application, after determining whether the temperature difference is greater than a first preset threshold, it also includes: if the temperature difference is less than or equal to the first preset threshold, returning to the previous counter value until the accumulated value reaches the preset number of times again.

[0009] Optionally, in one embodiment of the present application, the correction of the evaporator temperature according to the evaporation temperature corresponding to the refrigerant low pressure includes: calculating the evaporation temperature corresponding to the refrigerant low pressure using the saturation temperature corresponding to the refrigerant low pressure, superheat and offset; calculating the actual temperature using the evaporation temperature corresponding to the refrigerant low pressure, the variance of the evaporator temperature, the variance of the saturation temperature corresponding to the refrigerant low pressure, the evaporation temperature corresponding to the refrigerant low pressure and the evaporator temperature.

[0010] Optionally, in one embodiment of the present application, it also includes: obtaining the requested speed of the compressor; determining whether the requested speed is greater than a preset speed threshold; if the requested speed is greater than the preset speed threshold, determining that the compressor is in the on state and starting to obtain the evaporator temperature.

[0011] Optionally, in one embodiment of the present application, after obtaining the actual temperature of the evaporator, it also includes: generating a sensor abnormality signal of the evaporator based on the actual temperature of the evaporator; using the sensor abnormality signal to generate a corresponding abnormality message, and pushing the sensor abnormality reminder of the evaporator in combination with the abnormality message.

[0012] A second aspect of the present application provides a temperature detection device for a vehicle evaporator, comprising: a first acquisition module for acquiring the evaporator temperature of the vehicle evaporator; a calculation module for calculating the temperature difference between the evaporator temperature and the saturation temperature corresponding to the refrigerant low pressure when the evaporator temperature is less than or equal to a preset temperature and the number of times the evaporator temperature is less than or equal to the preset temperature reaches a preset number, and determining whether the temperature difference is greater than a first preset threshold; and a correction module for correcting the evaporator temperature according to the evaporation temperature corresponding to the refrigerant low pressure when the temperature difference is greater than the first preset threshold, so as to obtain the actual temperature of the evaporator.

[0013] Optionally, in one embodiment of the present application, it further includes: an accumulation module, which is used to accumulate the current counter value when the evaporator temperature is less than or equal to the preset temperature until the accumulated value of the counter value reaches the preset number of times, and calculate the temperature difference.

[0014] Optionally, in one embodiment of the present application, it further includes: a return module, used to return the previous counter value when the temperature difference is less than or equal to the first preset threshold, until the accumulated value reaches the preset number again.

[0015] Optionally, in one embodiment of the present application, the correction module includes: a first calculation unit for calculating the evaporation temperature corresponding to the low pressure of the refrigerant using the saturation temperature corresponding to the low pressure of the refrigerant, the superheat and the offset; a second calculation unit for calculating the actual temperature using the evaporation temperature corresponding to the low pressure of the refrigerant, the variance of the evaporator temperature, the variance of the saturation temperature corresponding to the low pressure of the refrigerant, the evaporation temperature corresponding to the low pressure of the refrigerant and the evaporator temperature.

[0016] Optionally, in one embodiment of the present application, it also includes: a second acquisition module for acquiring the requested speed of the compressor; a judgment module for judging whether the requested speed is greater than a preset speed threshold; and a determination module for determining that the compressor is in the on state and starting to acquire the evaporator temperature when the requested speed is greater than the preset speed threshold.

[0017] Optionally, in one embodiment of the present application, it also includes: a generation module for generating a sensor abnormality signal of the evaporator based on the actual temperature of the evaporator; a reminder module for generating a corresponding abnormality message using the sensor abnormality signal, and pushing a sensor abnormality reminder of the evaporator in combination with the abnormality message.

[0018] A third aspect of the present application provides a vehicle, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the vehicle evaporator temperature detection method as described in the above embodiment.

[0019] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium stores computer instructions, and the computer instructions are used to enable the computer to execute the vehicle evaporator temperature detection method as described in the above embodiment.

[0020] A fifth aspect of the present application provides a computer program product, including a computer program, which, when executed, is used to implement the above-mentioned vehicle evaporator temperature detection method.

[0021] The embodiment of the present application can calculate the temperature difference between the evaporator temperature and the saturation temperature corresponding to the low pressure of the refrigerant when the evaporator temperature is less than or equal to the preset temperature, and the number of times the temperature is less than or equal to the preset temperature reaches the preset number, and when the temperature difference is greater than a first preset threshold, the evaporator temperature is corrected according to the evaporation temperature corresponding to the low pressure of the refrigerant to obtain the actual temperature of the evaporator. This does not rely on adding an evaporator temperature sensor, which reduces hardware costs. When it is judged that there is no abnormality, the evaporator body is used to collect the temperature, which can more accurately control the evaporator temperature. When it is judged that there is an abnormality, the evaporator temperature and the temperature corresponding to the saturation pressure of the refrigerant are subjected to data fusion processing to prevent the evaporator temperature from deviating too much from the actual value, resulting in abnormal system control. This solves the technical problem in the related art that the evaporator sensor is easily affected by environmental factors, resulting in evaporator temperature failure, thereby affecting compressor control, and the high cost of arranging multiple sensors is not conducive to popularization and application.

[0022] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the following description of the embodiments in conjunction with the accompanying drawings, in which:

[0024] Figure 1 This is a flow chart of a method for detecting the temperature of a vehicle evaporator according to an embodiment of the present application;

[0025] Figure 2 1 is a schematic diagram showing the principle of a method for detecting the temperature of a vehicle evaporator according to one embodiment of the present application;

[0026] Figure 3 This is a schematic structural diagram of a temperature detection device for a vehicle evaporator provided according to an embodiment of the present application;

[0027] Figure 4 A schematic structural diagram of a vehicle provided according to an embodiment of the present application. DETAILED DESCRIPTION

[0028] The following describes in detail embodiments of the present application, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present application, and should not be construed as limiting the present application.

[0029] The following describes a vehicle evaporator temperature detection method, device, vehicle, and storage medium according to an embodiment of the present application with reference to the accompanying drawings. In response to the technical problems mentioned in the background art above, in which the evaporator sensor is easily affected by environmental factors, resulting in evaporator temperature failure, thereby affecting compressor control, and the high cost of deploying multiple sensors is not conducive to widespread application, the present application provides a vehicle evaporator temperature detection method. In this method, when the evaporator temperature is less than or equal to a preset temperature and the number of times it is less than or equal to the preset temperature reaches a preset number, the temperature difference between the evaporator temperature and the saturation temperature corresponding to the refrigerant low pressure is calculated. When the temperature difference is greater than a first preset threshold, the evaporator temperature is corrected according to the evaporation temperature corresponding to the refrigerant low pressure to obtain the actual evaporator temperature. This method does not rely on adding an evaporator temperature sensor, thus reducing hardware costs. When it is determined that there is no abnormality, the evaporator body is used to collect temperature, which can more accurately control the evaporator temperature. When it is determined that there is an abnormality, the evaporator temperature and the temperature corresponding to the refrigerant saturation pressure are fused to prevent the evaporator temperature from deviating too much from the actual temperature, which may cause abnormal system control. This solves the technical problem in related technologies that the evaporator sensor is easily affected by environmental factors, causing the evaporator temperature to fail, thereby affecting the compressor control, and the high cost of arranging multiple sensors is not conducive to promotion and application.

[0030] Specifically, Figure 1 A schematic flow chart of a vehicle evaporator temperature detection method provided in an embodiment of the present application.

[0031] like Figure 1 As shown, the vehicle evaporator temperature detection method includes the following steps:

[0032] In step S101 , the evaporator temperature of the vehicle evaporator is acquired.

[0033] Understandably, electric and hybrid vehicles often require battery cooling or multi-temperature zones for air conditioning. To more accurately distribute cooling capacity, the air conditioning system typically includes one or more EXV valves and low-pressure PT sensors. For vehicles with low-pressure PT sensors, multi-sensor fusion can be used to identify evaporator temperature anomalies, identify evaporator failures, and prevent incorrect control.

[0034] The embodiment of the present application can use the evaporator sensor to obtain the evaporator temperature of the vehicle evaporator, that is, the sensed temperature of the sensor, so as to subsequently judge the reliability of the evaporator temperature, so that the vehicle's compressor can operate normally, thereby improving the vehicle's driving experience.

[0035] In step S102, when the evaporator temperature is less than or equal to the preset temperature and the number of times it is less than or equal to the preset temperature reaches the preset number, the temperature difference between the evaporator temperature and the saturation temperature corresponding to the low pressure of the refrigerant is calculated, and it is determined whether the temperature difference is greater than the first preset threshold.

[0036] It is understandable that when the evaporator is in operation, the temperature is generally maintained within a certain range. When the evaporator temperature is lower than a certain temperature, it can be determined that there is a possibility of a temperature acquisition error in the evaporator.

[0037] Therefore, the embodiment of the present application can accumulate the number of times the evaporator temperature is less than a certain value, such as a protection value, when the evaporator temperature is less than a certain value, and when the accumulated number reaches a certain value, that is, after the evaporator temperature reaches the protection value multiple times, it is judged that an abnormality has occurred in the control of the main compressor. In this scenario, condensed water may appear in the evaporator, causing the evaporator temperature sensor to fail.

[0038] The embodiment of the present application can calculate the temperature difference between the evaporator temperature and the saturation temperature corresponding to the refrigerant low pressure, and determine the correlation between the evaporator collection temperature and the temperature corresponding to the refrigerant low pressure based on the temperature difference, and judge whether there is condensed water based on the correlation.

[0039] It should be noted that the preset temperature, the preset number of times and the first preset threshold can be set by those skilled in the art according to actual conditions and are not specifically limited here.

[0040] Optionally, in one embodiment of the present application, before calculating the temperature difference between the evaporator temperature and the saturation temperature corresponding to the refrigerant low pressure, it also includes: when the evaporator temperature is less than or equal to the preset temperature, accumulating the current counter value until the accumulated value of the counter value reaches a preset number of times, and calculating the temperature difference.

[0041] In some embodiments, when the evaporator temperature is less than or equal to a certain temperature (such as a protection value), the internal counter can be used to add one to the cumulative number of times, and determine whether the current cumulative value has reached a certain number of times, so that the temperature difference can be calculated when the certain number of times is reached.

[0042] Optionally, in one embodiment of the present application, after determining whether the temperature difference is greater than the first preset threshold, it also includes: if the temperature difference is less than or equal to the first preset threshold, returning to the previous counter value until the accumulated value reaches the preset number again.

[0043] In other embodiments, the embodiments of the present application can also determine that the deviation between the corrected temperature and the collection temperature of the evaporator is not large when the temperature difference is less than or equal to a certain difference, that is, the correlation between the collection temperature of the evaporator and the corresponding temperature of the refrigerant low pressure is high. At this time, the embodiments of the present application can return to the previous counter value, that is, the cumulative value minus one, and perform temperature difference judgment when the next cumulative value reaches a certain value.

[0044] In step S103 , if the temperature difference is greater than a first preset threshold, the evaporator temperature is corrected according to the evaporation temperature corresponding to the low pressure of the refrigerant to obtain the actual temperature of the evaporator.

[0045] As a possible implementation method, the embodiment of the present application can use a fusion algorithm to correct the evaporator temperature when the temperature difference is greater than a certain difference, that is, when the correlation between the collected temperature of the evaporator and the corresponding temperature of the refrigerant low pressure is low, so as to obtain the actual temperature of the evaporator.

[0046] For example, under normal operating conditions, the evaporator temperature is close to the saturation temperature corresponding to the low pressure of the refrigerant + TSH (Total Super Heat, total superheat) superheat + offset. eva -T p When ≥10(TBD), the evaporator temperature is considered abnormal and the output evaporator temperature is corrected.

[0047] By judging the abnormality of the evaporator temperature, the embodiment of the present application can reduce the use of the evaporator data fusion algorithm. Because the evaporator temperature and the actual temperature may deviate to a certain extent after the data fusion algorithm, which affects the control accuracy, this problem can be avoided by performing data fusion after the preset abnormality judgment.

[0048] The method of correcting the evaporator temperature using the evaporation temperature corresponding to the low pressure of the refrigerant will be described below.

[0049] Optionally, in one embodiment of the present application, the evaporator temperature is corrected according to the evaporation temperature corresponding to the low pressure of the refrigerant, including: calculating the evaporation temperature corresponding to the low pressure of the refrigerant using the saturation temperature corresponding to the low pressure of the refrigerant, the superheat and the offset; calculating the actual temperature using the evaporation temperature corresponding to the low pressure of the refrigerant, the variance of the evaporator temperature, the variance of the saturation temperature corresponding to the low pressure of the refrigerant, the evaporation temperature corresponding to the low pressure of the refrigerant and the evaporator temperature.

[0050] Here, the method of correcting the evaporator temperature by using the evaporation temperature corresponding to the low pressure of the refrigerant, namely the fusion algorithm, is described.

[0051] The embodiment of the present application can adopt a sensor data fusion algorithm to perform data fusion based on the sensor's own measurement variance. Since the previous step has determined that the evaporator temperature is abnormal, the variance σ1 of the evaporator temperature sensor T can be 1, and the variance σ2 of the P (refrigerant low pressure) sensor can be 0.5. The low pressure P corresponds to the evaporation temperature T(p) = the low pressure corresponding saturation temperature + TSH superheat (TBD) + offset (TBD);

[0052]

[0053] Among them, T eva Corr is the actual temperature, T eva Raw is the evaporator temperature.

[0054] Optionally, in one embodiment of the present application, it also includes: obtaining the requested speed of the compressor; determining whether the requested speed is greater than a preset speed threshold; if the requested speed is greater than the preset speed threshold, determining that the compressor is in the on state and starting to obtain the vehicle evaporator temperature.

[0055] Before determining the evaporator temperature, the embodiment of the present application first needs to determine the state of the compressor.

[0056] For example, the embodiment of the present application can obtain the requested speed of the compressor, and determine that the compressor is in the on state when the requested speed of the compressor is greater than a preset speed threshold, such as greater than zero.

[0057] Optionally, in one embodiment of the present application, after obtaining the actual temperature of the evaporator, it also includes: generating a sensor abnormality signal of the evaporator based on the actual temperature of the evaporator; using the sensor abnormality signal to generate a corresponding abnormality message, and pushing the evaporator sensor abnormality reminder in combination with the abnormality message.

[0058] The embodiment of the present application can generate a sensor abnormality signal of the evaporator according to the actual temperature of the evaporator to ensure the efficient operation of the entire refrigeration cycle and detect possible fault signs as early as possible.

[0059] Using sensor anomaly signals, embodiments of the present application can further generate a detailed anomaly message. This message can include specific information about the sensor anomaly, such as the temperature deviation value, the time of occurrence, and possible cause analysis, providing maintenance personnel or automated management systems with clear, easy-to-understand fault indications, helping to quickly locate the problem.

[0060] The embodiment of the present application can combine the generated abnormal message and actively push the reminder of the evaporator sensor abnormality through various means such as system notification, so that necessary maintenance measures can be taken in time, thereby ensuring the long-term reliability and energy efficiency of the system.

[0061] Combine Figure 2 As shown, the temperature detection method of the vehicle evaporator of the embodiment of the present application is described in detail with an embodiment.

[0062] S1: Determine whether the compressor is on. Obtain the compressor requested speed. If the compressor requested speed > 0, the compressor is determined to be on.

[0063] S2: Get the evaporator temperature collected by the sensor. When the evaporator temperature is ≤1°C, it is determined that the condition is met and the internal counter N is incremented by 1.

[0064] When N<4, the evaporator temperature E1 is continuously collected.

[0065] When N ≥ 4, enter condition S4 to determine the difference between the collected evaporation temperature value and the saturation temperature value corresponding to the low pressure P. By determining the abnormality of the evaporator temperature described above, the use of the evaporator data fusion algorithm can be reduced. Because the evaporator temperature after the data fusion algorithm may deviate from the actual temperature to a certain extent, affecting the control accuracy, this problem can be avoided by performing data fusion after the preset abnormality determination.

[0066] Under normal working conditions, the evaporator temperature is close to the saturation temperature corresponding to the low pressure of the refrigerant + TSH (Total SuperHeat, total superheat) superheat + offset. eva -T p When ≥10(TBD), the evaporator temperature is considered abnormal and the output evaporator temperature is corrected.

[0067] The E2 correction algorithm uses a sensor data fusion algorithm to perform data fusion based on the sensor's own measurement variance. Since the evaporator temperature has been determined to be abnormal in the previous step, the evaporator temperature sensor T variance σ1 can be set to 1, and the P (refrigerant low pressure) sensor σ2 can be set to 0.5. The low pressure P corresponds to the evaporation temperature T(p) = the low pressure corresponding saturation temperature + TSH superheat (TBD) + offset (TBD);

[0068]

[0069] In summary, the embodiments of the present application utilize an evaporator temperature determination algorithm. After the evaporator temperature reaches the protection value multiple times, it is determined that an abnormality has occurred in the main compressor control. In this scenario, it is determined that condensation may have occurred in the evaporator, causing the evaporator temperature sensor to fail. After determining that the evaporator sensor has failed, data fusion processing is performed using the evaporator temperature and the refrigerant temperature corresponding to the low-pressure P. When there is no condensation, the evaporator temperature is highly correlated with the refrigerant temperature corresponding to the low-pressure P, and the data fusion algorithm corrects the temperature to a small degree. When condensation is present, the evaporator temperature is less correlated with the refrigerant temperature corresponding to the low-pressure P, causing the evaporator temperature to rise abnormally and the refrigerant temperature corresponding to the low-pressure P to drop rapidly. The data fusion algorithm corrects the temperature to approximate the actual evaporator temperature. This algorithm prevents erroneous control based solely on the evaporator temperature sensor.

[0070] According to the vehicle evaporator temperature detection method proposed in the embodiment of the present application, when the evaporator temperature is less than or equal to the preset temperature, and the number of times the evaporator temperature is less than or equal to the preset temperature reaches a preset number, the temperature difference between the evaporator temperature and the saturation temperature corresponding to the refrigerant low pressure can be calculated. When the temperature difference is greater than a first preset threshold, the evaporator temperature is corrected according to the evaporation temperature corresponding to the refrigerant low pressure to obtain the actual temperature of the evaporator. This does not rely on adding an evaporator temperature sensor, which reduces hardware costs. When it is determined that there is no abnormality, the evaporator body is used to collect the temperature, which can more accurately control the evaporator temperature. When it is determined that there is an abnormality, the evaporator temperature and the temperature corresponding to the refrigerant saturation pressure are fused to prevent the evaporator temperature from deviating too much from the actual value, resulting in abnormal system control. This solves the technical problem in the related art that the evaporator sensor is easily affected by environmental factors, resulting in evaporator temperature failure, thereby affecting compressor control, and the high cost of arranging multiple sensors is not conducive to popularization and application.

[0071] Next, a temperature detection device for a vehicle evaporator according to an embodiment of the present application will be described with reference to the accompanying drawings.

[0072] Figure 3 4 is a block diagram of a temperature detection device for a vehicle evaporator according to an embodiment of the present application.

[0073] like Figure 3 As shown, the vehicle evaporator temperature detection device 10 includes: a first acquisition module 100, a calculation module 200 and a correction module 300.

[0074] Specifically, the first acquisition module 100 is used to acquire the evaporator temperature of the vehicle evaporator.

[0075] The calculation module 200 is used to calculate the temperature difference between the evaporator temperature and the saturation temperature corresponding to the low pressure of the refrigerant when the evaporator temperature is less than or equal to the preset temperature and the number of times the evaporator temperature is less than or equal to the preset temperature reaches a preset number, and to determine whether the temperature difference is greater than a first preset threshold.

[0076] The correction module 300 is used to correct the evaporator temperature according to the evaporation temperature corresponding to the low pressure of the refrigerant when the temperature difference is greater than a first preset threshold value, so as to obtain the actual temperature of the evaporator.

[0077] Optionally, in one embodiment of the present application, the vehicle evaporator temperature detection device 10 further includes: an accumulation module.

[0078] The accumulation module is used to accumulate the current counter value when the evaporator temperature is less than or equal to the preset temperature until the accumulated value of the counter value reaches a preset number of times, and calculate the temperature difference.

[0079] Optionally, in one embodiment of the present application, the temperature detection device 10 for the vehicle evaporator further includes: a return module.

[0080] The return module is used to return the previous counter value when the temperature difference is less than or equal to the first preset threshold value, until the accumulated value reaches the preset number of times again.

[0081] Optionally, in one embodiment of the present application, the correction module 300 includes: a first calculation unit and a second calculation unit.

[0082] The first calculation unit is used to calculate the evaporation temperature corresponding to the low pressure of the refrigerant using the saturation temperature corresponding to the low pressure of the refrigerant, the superheat and the offset.

[0083] The second calculation unit is used to calculate the actual temperature using the evaporation temperature corresponding to the low pressure of the refrigerant, the variance of the evaporator temperature, the variance of the saturation temperature corresponding to the low pressure of the refrigerant, the evaporation temperature corresponding to the low pressure of the refrigerant, and the evaporator temperature.

[0084] Optionally, in one embodiment of the present application, the temperature detection device 10 for a vehicle evaporator further includes: a second acquisition module, a judgment module, and a determination module.

[0085] The second acquisition module is used to acquire the requested speed of the compressor.

[0086] The judgment module is used to judge whether the requested speed is greater than a preset speed threshold.

[0087] The determination module is used to determine that the compressor is in the on state and start obtaining the vehicle evaporator temperature when the requested speed is greater than a preset speed threshold.

[0088] Optionally, in one embodiment of the present application, the vehicle evaporator temperature detection device 10 further includes: a generation module and a reminder module.

[0089] The generating module is used to generate a sensor abnormality signal of the evaporator based on the actual temperature of the evaporator.

[0090] The reminder module is configured to generate a corresponding abnormality message using the sensor abnormality signal and, in conjunction with the abnormality message, push a sensor abnormality reminder for the evaporator. It should be noted that the aforementioned explanation of the embodiment of the vehicle evaporator temperature detection method also applies to the vehicle evaporator temperature detection device of this embodiment and will not be repeated here.

[0091] According to the temperature detection device for a vehicle evaporator proposed in an embodiment of the present application, when the evaporator temperature is less than or equal to a preset temperature, and the number of times the temperature is less than or equal to the preset temperature reaches a preset number, the temperature difference between the evaporator temperature and the saturation temperature corresponding to the low pressure of the refrigerant can be calculated. When the temperature difference is greater than a first preset threshold, the evaporator temperature is corrected according to the evaporation temperature corresponding to the low pressure of the refrigerant to obtain the actual temperature of the evaporator. This does not rely on adding an evaporator temperature sensor, which reduces hardware costs. When it is determined that there is no abnormality, the evaporator body is used to collect the temperature, which can more accurately control the evaporator temperature. When it is determined that there is an abnormality, the evaporator temperature and the temperature corresponding to the saturation pressure of the refrigerant are fused to prevent the evaporator temperature from deviating too much from the actual value, resulting in abnormal system control. This solves the technical problem in the related art that the evaporator sensor is easily affected by environmental factors, resulting in evaporator temperature failure, thereby affecting compressor control, and the high cost of arranging multiple sensors is not conducive to popularization and application.

[0092] Figure 4 A schematic diagram of the structure of a vehicle provided in an embodiment of the present application. The vehicle may include:

[0093] Memory 401 , processor 402 , and computer programs stored in the memory 401 and executable on the processor 402 .

[0094] When the processor 402 executes the program, the vehicle evaporator temperature detection method provided in the above embodiment is implemented.

[0095] Furthermore, the vehicle further comprises:

[0096] The communication interface 403 is used for communication between the memory 401 and the processor 402 .

[0097] The memory 401 is used to store computer programs that can be run on the processor 402 .

[0098] The memory 401 can include a high-speed RAM memory, and can also include a non-volatile memory, for example, at least one disk memory.

[0099] If the memory 401, the processor 402 and the communication interface 403 are implemented independently, the communication interface 403, the memory 401 and the processor 402 can be connected to each other through a bus and complete communication between each other. The bus can be an Industry Standard Architecture (ISA) bus, a Peripheral Component (PCI) bus or an Extended Industry Standard Architecture (EISA) bus, etc. The bus can be divided into an address bus, a data bus, a control bus, etc. For convenience of representation, Figure 4 In the figure, only one thick line is used to represent the bus, but it does not mean that there is only one bus or only one type of bus.

[0100] Optionally, in a specific implementation, if the memory 401, the processor 402 and the communication interface 403 are integrated on a chip, the memory 401, the processor 402 and the communication interface 403 can complete communication between each other through an internal interface.

[0101] The processor 402 can be a Central Processing Unit (CPU), or an Application Specific Integrated Circuit (ASIC), or one or more integrated circuits configured to implement one or more embodiments of the present application.

[0102] The embodiment also provides a computer readable storage medium, having stored thereon a computer program, which, when executed by a processor, implements the vehicle evaporator temperature detection method.

[0103] The embodiment of the present application also provides a computer program product, comprising a computer program, which, when executed by a processor, implements the vehicle evaporator temperature detection method provided by the embodiment of the present application.

[0104] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or N embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0105] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of technical features indicated. Thus, a feature specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this application, "N" means at least two, for example, two, three, etc., unless otherwise specifically defined.

[0106] Any process or method description in a flowchart or otherwise described herein may be understood to represent a module, fragment or portion of code comprising one or N executable instructions for implementing a custom logical function or process step, and the scope of the preferred embodiments of the present application includes alternative implementations in which functions may be performed in a different order than shown or discussed, including performing functions in a substantially simultaneous manner or in a reverse order depending on the functions involved, which should be understood by those skilled in the art to which the embodiments of the present application pertain.

[0107] The logic and / or steps represented in the flowcharts or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing the logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (e.g., a computer-based system, a system including a processor, or other system that can fetch and execute instructions from an instruction execution system, apparatus, or device). For purposes of this specification, a "computer-readable medium" can be any device that can contain, store, communicate, propagate, or transport a program for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include the following: an electrical connection with one or N wires (electronic devices), a portable computer disk cartridge (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and programmable read-only memory (EPROM or flash memory), fiber optic devices, and a portable compact disc read-only memory (CDROM). In addition, the computer-readable medium may even be paper or other suitable medium on which the program is printed, since the program can be obtained electronically by optically scanning the paper or other medium and then editing, interpreting or processing it in other suitable ways as necessary, and then storing it in a computer memory.

[0108] It should be understood that various parts of the present application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiment, the N steps or methods can be implemented using software or firmware stored in a memory and executed by a suitable instruction execution system. For example, if implemented using hardware, as in another embodiment, any one of the following technologies known in the art or a combination thereof can be used to implement: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application-specific integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0109] Those skilled in the art will understand that all or part of the steps in the method of the above embodiment can be completed by instructing related hardware through a program, and the program can be stored in a computer-readable storage medium. When the program is executed, it includes one or a combination of the steps of the method embodiment.

[0110] In addition, the functional units in the various embodiments of the present application may be integrated into a processing module, or each unit may exist physically separately, or two or more units may be integrated into a module. The above-mentioned integrated module may be implemented in the form of hardware or in the form of a software functional module. If the integrated module is implemented in the form of a software functional module and sold or used as an independent product, it may also be stored in a computer-readable storage medium.

[0111] The storage medium mentioned above may be a read-only memory, a magnetic disk, or an optical disk, etc. Although the embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application. Persons skilled in the art may make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present application.

Claims

1. A method for detecting the temperature of a vehicle evaporator, characterized in that: The following steps are involved: Get the evaporator temperature of the vehicle evaporator; When the evaporator temperature is less than or equal to a preset temperature, and the number of times the evaporator temperature is less than or equal to the preset temperature reaches a preset number, calculating the temperature difference between the evaporator temperature and the saturation temperature corresponding to the low pressure of the refrigerant, and determining whether the temperature difference is greater than a first preset threshold; If the temperature difference is greater than the first preset threshold, the evaporator temperature is corrected according to the evaporation temperature corresponding to the low pressure of the refrigerant to obtain the actual temperature of the evaporator.

2. The method according to claim 1, characterized in that Before calculating the temperature difference between the evaporator temperature and the saturation temperature corresponding to the low pressure of the refrigerant, the method further includes: When the evaporator temperature is less than or equal to the preset temperature, the current counter value is accumulated until the accumulated value of the counter value reaches the preset number of times, and the temperature difference is calculated.

3. The method according to claim 2, characterized in that After determining whether the temperature difference is greater than a first preset threshold, the method further includes: If the temperature difference is less than or equal to the first preset threshold, the counter value is returned to the previous time until the accumulated value reaches the preset number of times again.

4. The method according to claim 1, wherein The step of correcting the evaporator temperature according to the evaporation temperature corresponding to the low pressure of the refrigerant includes: Calculating the evaporation temperature corresponding to the low pressure of the refrigerant using the saturation temperature corresponding to the low pressure of the refrigerant, the superheat and the offset; The actual temperature is calculated using the evaporation temperature corresponding to the refrigerant low pressure, the variance of the evaporator temperature, the variance of the saturation temperature corresponding to the refrigerant low pressure, the evaporation temperature corresponding to the refrigerant low pressure, and the evaporator temperature.

5. The method according to claim 1, wherein Also includes: Get the requested speed of the compressor; Determining whether the requested speed is greater than a preset speed threshold; If the requested speed is greater than the preset speed threshold, it is determined that the compressor is in the on state, and the evaporator temperature is obtained.

6. The method according to claim 1, characterized in that After obtaining the actual temperature of the evaporator, the method further includes: generating a sensor abnormality signal of the evaporator based on an actual temperature of the evaporator; The sensor abnormality signal is used to generate a corresponding abnormality message, and the sensor abnormality reminder of the evaporator is pushed in combination with the abnormality message.

7. A temperature detection device for a vehicle evaporator, characterized in that: include: An acquisition module, used for acquiring an evaporator temperature of a vehicle evaporator; a calculation module, configured to calculate a temperature difference between the evaporator temperature and a saturation temperature corresponding to a low pressure of the refrigerant, and determine whether the temperature difference is greater than a first preset threshold value, when the evaporator temperature is less than or equal to a preset temperature and the number of times the evaporator temperature is less than or equal to the preset temperature reaches a preset number; The correction module is used to correct the evaporator temperature according to the evaporation temperature corresponding to the low pressure of the refrigerant when the temperature difference is greater than the first preset threshold value, so as to obtain the actual temperature of the evaporator.

8. The device according to claim 7, characterized in that Also includes: The accumulation module is used to accumulate the current counter value when the evaporator temperature is less than or equal to the preset temperature until the accumulated value of the counter value reaches the preset number of times, and calculate the temperature difference.

9. A vehicle, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the vehicle evaporator temperature detection method according to any one of claims 1 to 6.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: The program is executed by a processor to implement the vehicle evaporator temperature detection method according to any one of claims 1 to 6.

Images