Method for preventing condensation of electrical devices in an electrical cabin air conditioner

Abstract

The application discloses a method for preventing condensation of electrical devices in an electrical cabin air conditioner. The method comprises the following steps: S1: determining whether dew is generated by a condensation detection device arranged in the electrical cabin, and if so, performing dew removal operation, otherwise, entering step S2; S2: collecting the temperature in the electrical cabin and the ambient temperature outside according to different temperature sampling frequencies based on the charging state of the charging station; S3: determining the condensation trend in the electrical cabin according to the comparison of the collected electrical cabin temperature and the ambient temperature and the change trend of the electrical cabin temperature; if the condensation trend exists, entering step S4; otherwise, ending; S4: controlling the air conditioner frequency and the charging power according to the condensation trend. According to the working state of the charging pile, the temperature of each point in the integrated charging station and the external ambient temperature are combined to comprehensively control the charging power of the charging station and the air conditioner frequency, so that the internal electrical elements are prevented from condensing.

Description

Technical Field

[0001] This invention relates to the field of dew point temperature control, and more particularly to a method for preventing condensation on electrical components in an electrical compartment air conditioning system. Background Technology

[0002] Currently, the penetration rate of new energy vehicles is increasing, and the trend of vehicle electrification is significant. However, the problem of "charging difficulties" that plagues new energy vehicles has not been well resolved. Among them, the insufficient proportion of fast charging infrastructure is one of the main reasons for the charging difficulties of new energy vehicles. Therefore, urban fast charging infrastructure has become an important part of new infrastructure construction.

[0003] Currently, integrated charging stations have built-in air conditioning to cool the charging piles during hot weather and prevent overheating malfunctions. However, air with high humidity and relatively high temperature condenses when it cools, forming dew. If this occurs inside the charging station, it can easily cause short circuits and other threats to the internal electrical equipment. Therefore, certain methods are needed to prevent condensation from forming on the internal electrical components.

[0004] For example, a "condensation prevention system and control method for air conditioning" disclosed in Chinese patent literature, publication number CN106839381A, includes: an inlet pipe connected to the inlet end of a heat exchanger, a chilled water flow control valve installed on the inlet pipe, a chilled water temperature probe installed at the outlet end of the chilled water flow control valve, and an inlet water temperature probe installed at the inlet end of the heat exchanger; a return air temperature and humidity sensor for detecting the return air dew point temperature; and a bypass branch connected at one end to the outlet pipe of the heat exchanger and at the other end to the inlet pipe of the heat exchanger, the outlet end of the bypass branch being located between the chilled water temperature probe and the inlet water temperature probe, and a bypass valve, a water pump, and a branch temperature probe being sequentially installed on the bypass branch in the direction of water flow. This invention achieves the effect of preventing condensation by setting up a bypass branch connecting the outlet and inlet sides of the heat exchanger, feeding the hot water from the heat exchanger outlet back to the inlet side of the heat exchanger, and adjusting the temperature of the chilled water finally flowing into the heat exchanger by comparing the return air dew point temperature and the coil temperature.

[0005] This solution targets air conditioning systems that are constantly operating. Most integrated charging stations on the market control the internal temperature based on the return air temperature. However, even when the charging station is not in use, the air conditioning unit still operates according to temperature changes, resulting in high energy consumption. To reduce power consumption, the integrated charging station controls the power of the air conditioning unit based on whether charging is in progress. In this case, existing systems and methods for preventing condensation in continuously operating air conditioners are not suitable for air conditioners used in integrated charging stations for new energy vehicles that are exposed to the elements outdoors. Furthermore, the cable temperature rises during charging; if the internal air temperature is too cold at this time, condensation is also likely to occur. Summary of the Invention

[0006] This invention primarily addresses the problem that existing methods for preventing condensation in air conditioning do not take into account the operating status of charging piles. It provides a method for preventing condensation on electrical components in the electrical compartment air conditioning system. Based on the operating status of the charging pile, combined with the temperature of various points inside the integrated charging station and the external ambient temperature, the charging power and air conditioning frequency of the charging station are comprehensively controlled to prevent condensation on internal electrical components.

[0007] The above-mentioned technical problems of the present invention are mainly solved by the following technical solutions: A method for preventing condensation on electrical components in an electrical compartment air conditioning system includes the following steps: S1: Determine whether dew is generated by the condensation detection device installed inside the electrical compartment. If dew is generated, perform decondensation operation; otherwise, proceed to step S2. S2: Collect the temperature inside the electrical compartment and the ambient temperature outside at different temperature sampling frequencies according to the charging status of the charging station; S3: Determine the condensation trend inside the electrical compartment based on the comparison between the collected temperature inside the electrical compartment and the ambient temperature, as well as the temperature change trend inside the electrical compartment; if a condensation trend is determined, proceed to step S4; otherwise, end. S4: Control the air conditioning frequency and charging power according to the condensation trend.

[0008] Based on the working status of the charging pile, combined with the temperature of various points inside the integrated charging station and the external ambient temperature, the charging power and air conditioning frequency of the charging station are comprehensively controlled to prevent condensation on the internal electrical components.

[0009] Preferably, the condensation detection device includes Laser emitter, emits laser light; A mirror is placed on the electrical equipment to be tested to reflect the laser emitted by the laser emitter. The laser receiver is positioned close to the laser transmitter and in the same direction as the laser transmitter, but outside the reflection range of the laser mirror of the laser transmitter.

[0010] When there is no condensation, the laser receiver is located outside the reflection area and cannot receive the laser reflected by the mirror, so there is no feedback signal. If condensation occurs on the mirror, the original mirror reflection will be converted into diffuse reflection, and the laser receiver will receive the laser signal to determine whether there is condensation on the electrical equipment.

[0011] Preferably, the condensation detection device is vertically installed at the heat dissipation point of the electrical equipment.

[0012] It is more prone to condensation, providing early warning and maintaining detection sensitivity; the air outlet at the heat dissipation point removes dust, maintains mirror reflection, and avoids dust interference.

[0013] Preferably, the ambient temperature sampling frequency is a fixed preset value; the temperature sampling frequency inside the electrical compartment includes the charging temperature sampling frequency and the idle temperature sampling frequency; the temperature sampling frequency inside the electrical compartment is adjusted according to the air conditioning frequency.

[0014] The temperature sampling frequency is adjusted according to the device's charging status, making the sampling frequency more suitable for the device's operating conditions. This ensures that important temperature change data is not missed, while also avoiding waste caused by excessive collection of invalid data.

[0015] Preferably, the process for adjusting the charging temperature sampling frequency is as follows: Among them, f Tc The charging temperature sampling frequency; f cc The air conditioning frequency during charging; f cmax This is the maximum air conditioner frequency during charging. f cmin This is the minimum air conditioner frequency during charging. f Tc0 The set sampling frequency value for the charging temperature; N is the frequency adjustment level; f hc This represents the average historical air conditioning frequency. The process for adjusting the idle temperature sampling frequency is as follows: Among them, f Ts This refers to the idle temperature sampling frequency. f cs This refers to the air conditioning frequency during idle periods. f Ts0 This is the set idle temperature sampling frequency value.

[0016] The air conditioning frequency is coupled with the temperature sampling frequency to fully consider the air conditioning usage environment under different working conditions of the integrated charging station.

[0017] As a preferred method, the process for determining the condensation trend is as follows: D1: Plot the temperature change curve inside the electrical compartment over time; plot the first comparison window with the dew point temperature as the central axis. D2: Calculate the ratio of the area between the temperature change curve and the dew point temperature in the first comparison window to the total area of ​​the first comparison window; if the area ratio is less than the first rated threshold, it is determined that there is a condensation trend; otherwise, proceed to D3 for judgment. D3: Calculate the temperature difference between the electrical compartment and the ambient temperature. If the temperature difference is greater than the rated temperature difference Td, it is determined that there is a condensation trend; otherwise, proceed to D4. D4: Plot the temperature difference over time curve, iterate through all data points in the temperature difference curve, and construct a second comparison window with the data points in the temperature difference curve as the origin. D5: Determine the ratio of the area between the temperature change curve in the second comparison window and the bottom edge of the second comparison window to the total area of ​​the second comparison window; if the area ratio is less than the second rated threshold, it is determined that there is a condensation trend, otherwise the process ends.

[0018] By comparing the temperature with the dew point temperature, considering the temperature difference and the rate of change of the temperature difference, and taking multiple dimensions into account, condensation can be avoided.

[0019] Preferably, the horizontal length of the first comparison window is the rated time T, and the vertical length of the first comparison window is with the dew point temperature as the axis, with the upper and lower heights being preset temperature fluctuation tolerance values ​​t, respectively. e ; The horizontal length of the second comparison window is the rated time T, and the vertical height of the second comparison window is the preset temperature change threshold Δt.

[0020] Set up a comparison window to issue early warnings. Provide early warnings for data that is very close to but has not yet reached the threshold, thereby improving the accuracy of judgment and preventing problems in advance.

[0021] As a preferred option, the frequency adjustment process for the rechargeable air conditioner is as follows: st Among them, f cc The air conditioning frequency during charging; T t The real-time temperature inside the electrical compartment was collected. T out The real-time ambient temperature was collected. T s This refers to the dew point temperature. T d The set rated temperature difference; f cmax This is the maximum air conditioner frequency during charging. f cmin This is the minimum air conditioner frequency during charging. N is the frequency adjustment level; [·] indicates rounding; The air conditioner frequency adjustment process during idle periods is as follows: Among them, f cS This refers to the air conditioning frequency during idle periods. t eThis is the preset temperature fluctuation tolerance value.

[0022] Preferably, the process for adjusting the charging power is as follows: Among them, P c This refers to the charging power. P a Rated charging power; f a The median air conditioner frequency during charging is the maximum air conditioner frequency f during charging. cmax Minimum air conditioner frequency f during charging cmin The average value; ΔP represents the unity power regulation level.

[0023] The beneficial effects of this invention are: 1. Based on the working status of the charging pile, combined with the temperature of various points inside the integrated charging station and the external ambient temperature, comprehensively control the charging power and air conditioning frequency of the charging station to prevent condensation on the internal electrical components.

[0024] 2. Adjust the temperature sampling frequency according to the device's charging status to make the sampling frequency more suitable for the device's operating conditions. This ensures that important temperature change data is not missed and avoids waste caused by excessive collection of invalid data.

[0025] 3. Couple the air conditioning frequency with the temperature sampling frequency to fully consider the air conditioning usage environment under different working conditions of the integrated charging station.

[0026] 4. Compare the temperature and dew point temperature sequentially, considering the temperature difference and the rate of change of the temperature difference, taking into account multiple dimensions to avoid condensation.

[0027] 5. Set up a comparison window for early warning. Provide early warnings for data that is very close to but has not yet reached the threshold, thereby improving the accuracy of judgment and preventing problems in advance. Attached Figure Description

[0028] Figure 1 This is a flowchart of a method for preventing condensation of electrical components in an electrical compartment air conditioning system according to the present invention.

[0029] Figure 2 This is a schematic diagram of the condensation detection device of the present invention.

[0030] In the diagram, 1. Laser emitter, 2. Laser receiver, 3. Mirror. Detailed Implementation

[0031] The technical solution of the present invention will be further described in detail below through embodiments and in conjunction with the accompanying drawings.

[0032] Example: This embodiment provides a method for preventing condensation on electrical components in an electrical compartment air conditioning system, such as... Figure 1 As shown, it includes the following steps: S1: Determine whether dew is generated by the condensation detection device installed inside the electrical compartment. If dew is generated, perform decondensation operation; otherwise, proceed to step S2.

[0033] like Figure 2 As shown, the condensation detection device includes a laser emitter 1, a laser receiver 2, and a mirror 3.

[0034] The laser receiver 2 is positioned close to the laser emitter 1 and in the same direction as the laser emitter 1, but outside the reflection range of the laser mirror of the laser emitter 1. In this embodiment, the laser receiver 2 is positioned parallel to the laser emitter 1.

[0035] Laser emitter 1 emits a laser, and mirror 3 is placed at the electrical equipment to be tested to reflect the laser emitted by laser emitter 1.

[0036] When there is no condensation, the laser receiver 2 is located outside the reflection area and cannot receive the laser reflected by the mirror, so there is no feedback signal. If condensation occurs at the electrical equipment to be tested, condensation will also occur on the mirror 3. The dew will convert the mirror reflection into diffuse reflection, and the laser receiver 2 will receive the laser signal to determine whether there is condensation on the electrical equipment.

[0037] The condensation detection device is vertically installed at the heat dissipation point of the electrical equipment. The temperature at the heat dissipation point is higher, and the temperature difference with the surrounding environment is greater, making condensation more likely. This provides an early warning and maintains the sensitivity of the detection. At the same time, the air outlet at the heat dissipation point removes dust, maintains mirror reflection, and avoids interference from dust.

[0038] S2: Collect the temperature inside the electrical compartment and the ambient temperature outside at different temperature sampling frequencies according to the charging status of the charging station.

[0039] The ambient temperature sampling frequency is a fixed preset value.

[0040] The temperature sampling frequency within the electrical compartment includes both charging temperature sampling frequency and idle temperature sampling frequency. The temperature sampling frequency within the electrical compartment is adjusted according to the air conditioning frequency.

[0041] The process for adjusting the charging temperature sampling frequency is as follows: Among them, f Tc The charging temperature sampling frequency; f cc The air conditioning frequency during charging; f cmax This is the maximum air conditioner frequency during charging. f cmin This is the minimum air conditioner frequency during charging. f Tc0 The set sampling frequency value for the charging temperature; N is the frequency adjustment level; f hc This represents the average historical air conditioning frequency.

[0042] The process for adjusting the idle temperature sampling frequency is as follows: Among them, f Ts This refers to the idle temperature sampling frequency. f cs This refers to the air conditioning frequency during idle periods. f Ts0 This is the set idle temperature sampling frequency value.

[0043] The temperature sampling frequency is adjusted according to the device's charging status, making the sampling frequency more suitable for the device's operating conditions. This ensures that important temperature change data is not missed, while also avoiding waste caused by excessive collection of invalid data.

[0044] The air conditioning frequency is coupled with the temperature sampling frequency to fully consider the air conditioning usage environment under different working conditions of the integrated charging station.

[0045] S3: Determine the condensation trend in the electrical compartment based on the comparison between the collected temperature inside the electrical compartment and the ambient temperature, as well as the temperature change trend inside the electrical compartment; if a condensation trend is determined, proceed to step S4; otherwise, end.

[0046] The process for judging the condensation trend is as follows: D1: Plot the temperature change curve inside the electrical compartment over time; plot the first comparison window with the dew point temperature as the central axis.

[0047] D2: Calculate the ratio of the area between the temperature change curve and the dew point temperature in the first comparison window to the total area of ​​the first comparison window; if the area ratio is less than the first rated threshold, it is determined that there is a condensation trend; otherwise, proceed to D3 for judgment. In this embodiment, the first rated threshold is 15%.

[0048] The horizontal length of the first comparison window is the rated time T, and the vertical length of the first comparison window is with the dew point temperature as the axis, with the upper and lower heights being the preset temperature fluctuation tolerance values ​​t, respectively. e .

[0049] Set up a comparison window to issue early warnings. Provide early warnings for data that is very close to but has not yet reached the threshold, thereby improving the accuracy of judgment and preventing problems in advance.

[0050] D3: Calculate the temperature difference between the electrical compartment temperature and the ambient temperature. When the temperature difference is greater than the rated temperature difference T... d If the condition is met, it is determined that there is a condensation trend; otherwise, proceed to D4.

[0051] D4: Plot the temperature difference over time, iterate through all the data points in the temperature difference curve, and construct a second comparison window with the data points in the temperature difference curve as the origin.

[0052] D5: Determine the ratio of the area between the temperature change curve in the second comparison window and the bottom edge of the second comparison window to the total area of ​​the second comparison window; if the area ratio is less than the second rated threshold, it is determined that there is a condensation trend; otherwise, the process ends. In this embodiment, the second rated threshold is 60%.

[0053] The horizontal length of the second comparison window is the rated time T, and the vertical height of the second comparison window is the preset temperature change threshold Δt.

[0054] By comparing the temperature with the dew point temperature, considering the temperature difference and the rate of change of the temperature difference, and taking multiple dimensions into account, condensation can be avoided.

[0055] S4: Control the air conditioning frequency and charging power according to the condensation trend.

[0056] The frequency adjustment process for the rechargeable air conditioner is as follows: st Among them, f cc The air conditioning frequency during charging; T t The real-time temperature inside the electrical compartment was collected. T Out The real-time ambient temperature was collected. T s This refers to the dew point temperature. T d The set rated temperature difference; f cmax This is the maximum air conditioner frequency during charging. f cmin This is the minimum air conditioner frequency during charging. N is the frequency adjustment level; [·] indicates rounding.

[0057] The air conditioner frequency adjustment process during idle periods is as follows: Among them, f cs This refers to the air conditioning frequency during idle periods. te This is the preset temperature fluctuation tolerance value.

[0058] The process of adjusting the charging power is as follows: Among them, P c This refers to the charging power. P a Rated charging power; f a The median air conditioner frequency during charging is the maximum air conditioner frequency f during charging. cmax Minimum air conditioning frequency during charging f cmin The average value; ΔP represents the unity power regulation level.

[0059] The solution in this embodiment comprehensively controls the charging power and air conditioning frequency of the charging station based on the working status of the charging pile, the temperature of each point inside the integrated charging station, and the external ambient temperature, in order to prevent condensation on the internal electrical components.

[0060] It should be understood that the embodiments are for illustrative purposes only and are not intended to limit the scope of the invention. Furthermore, it should be understood that after reading the teachings of this invention, those skilled in the art can make various alterations or modifications to the invention, and these equivalent forms also fall within the scope defined by the appended claims.

Claims

1. A method for preventing condensation on electrical components in an electrical compartment air conditioning system, characterized in that, Includes the following steps: S1: Determine whether dew has been generated by a condensation detection device installed inside the electrical compartment. If dew has been generated, perform a decondensation operation; otherwise, proceed to step S2. The condensation detection device is installed at the heat dissipation point of the electrical equipment and includes a laser emitter that emits laser light; a mirror that is installed at the electrical equipment to be tested and reflects the laser light emitted by the laser emitter; and a laser receiver that is located close to the laser emitter and in the same direction as the laser emitter, but outside the reflection range of the laser light mirror of the laser emitter. S2: Collect the temperature inside the electrical compartment and the ambient temperature outside at different temperature sampling frequencies according to the charging status of the charging station; S3: Determine the condensation trend inside the electrical compartment based on the comparison between the collected temperature inside the electrical compartment and the ambient temperature, as well as the temperature change trend inside the electrical compartment. If a condensation trend is detected, proceed to step S4; otherwise, end the process. S4: Control the air conditioning frequency and charging power according to the condensation trend.

2. The method for preventing condensation of electrical components in an electrical compartment air conditioning system according to claim 1, characterized in that, The condensation detection device is vertically installed at the heat dissipation point of the electrical equipment.

3. The method for preventing condensation of electrical components in an electrical compartment air conditioning system according to claim 1, characterized in that, The ambient temperature sampling frequency is a fixed preset value; the temperature sampling frequency inside the electrical compartment includes the charging temperature sampling frequency and the idle temperature sampling frequency; the temperature sampling frequency inside the electrical compartment is adjusted according to the air conditioning frequency.

4. A method for preventing condensation of electrical components in an electrical compartment air conditioning system according to claim 3, characterized in that, The process for adjusting the charging temperature sampling frequency is as follows: Among them, f Tc The charging temperature sampling frequency; f cc The air conditioning frequency during charging; f cmax This is the maximum air conditioner frequency during charging. f cmin This is the minimum air conditioner frequency during charging. f TcO The set sampling frequency value for the charging temperature; N is the frequency adjustment level; f hc This represents the average historical air conditioning frequency. The process for adjusting the idle temperature sampling frequency is as follows: Among them, f Ts This refers to the idle temperature sampling frequency. f cs This refers to the air conditioning frequency during idle periods. f TsO This is the set idle temperature sampling frequency value.

5. A method for preventing condensation of electrical components in an electrical compartment air conditioning system according to claim 1 or 4, characterized in that, The process for judging the condensation trend is as follows: D1: Plot the temperature change curve inside the electrical compartment over time; plot the first comparison window with the dew point temperature as the central axis. D2: Calculate the ratio of the area between the temperature change curve and the dew point temperature in the first comparison window to the total area of ​​the first comparison window; if the area ratio is less than the first rated threshold, it is determined that there is a condensation trend; otherwise, proceed to D3 for judgment. D3: Calculate the temperature difference between the electrical compartment temperature and the ambient temperature. When the temperature difference is greater than the rated temperature difference T... d If so, it is determined that there is a condensation trend; otherwise, proceed to D4. D4: Plot the temperature difference over time curve, iterate through all data points in the temperature difference curve, and construct a second comparison window with the data points in the temperature difference curve as the origin. D5: Determine the ratio of the area between the temperature change curve in the second comparison window and the bottom edge of the second comparison window to the total area of ​​the second comparison window; if the area ratio is less than the second rated threshold, it is determined that there is a condensation trend, otherwise the process ends.

6. A method for preventing condensation of electrical components in an electrical compartment air conditioning system according to claim 5, characterized in that, The horizontal length of the first comparison window is the rated time T, and the vertical length of the first comparison window is with the dew point temperature as the axis, with the upper and lower heights being the preset temperature fluctuation tolerance values ​​t, respectively. e ; The horizontal length of the second comparison window is the rated time T, and the vertical height of the second comparison window is the preset temperature change threshold Δt.

7. A method for preventing condensation of electrical components in an electrical compartment air conditioning system according to claim 1, 4, or 6, characterized in that, The frequency adjustment process for the rechargeable air conditioner is as follows: st Among them, f cc The air conditioning frequency during charging; T t The real-time temperature inside the electrical compartment was collected. T out The real-time ambient temperature was collected. T s This refers to the dew point temperature. T d The set rated temperature difference; f cmax This is the maximum air conditioner frequency during charging. f cmin This is the minimum air conditioner frequency during charging. N is the frequency adjustment level; [·] indicates rounding down; The air conditioner frequency adjustment process during idle periods is as follows: Among them, f cs This refers to the air conditioning frequency during idle periods. t e This is the preset temperature fluctuation tolerance value.

8. A method for preventing condensation of electrical components in an electrical compartment air conditioning system according to claim 7, characterized in that, The process of adjusting the charging power is as follows: Among them, P c This refers to the charging power. P a Rated charging power; f a The median air conditioner frequency during charging is the maximum air conditioner frequency f during charging. cmax Minimum air conditioning frequency during charging f cmin The average value; ΔP represents the unity power regulation level.

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