DC charging pile and filter blockage detection device and method thereof

Abstract

The present invention discloses a DC charging pile and its filter clogging detection device and method. The detection device includes a temperature acquisition unit, a storage unit, and a control unit. The temperature acquisition unit is used to collect charging temperature data during each charge. The storage unit is used to store a preset charging pile filter status database. The control unit is used to obtain the charging duration and charging power of each charge. The charging pile filter status is determined based on the charging duration, charging power, and charging temperature data of the same charge, as well as the charging pile filter status database. The present invention can realize automatic detection of the filter status, not only avoiding the problem of poor heat dissipation and charging pile shutdown caused by untimely filter replacement, but also avoiding the problem of low operation and maintenance efficiency and high cost caused by excessive filter cleaning or upgrading of protection level.

Description

Technical Field

[0001] The present invention belongs to the technical field of charging pile maintenance, and in particular relates to a DC charging pile and a filter clogging detection device and method thereof. Background Art

[0002] Charging piles are the energy source for new energy vehicles. Their primary function is to convert external power and provide stable and reliable power for new energy vehicles. DC charging piles generate a significant amount of heat during the power conversion process, necessitating a cooling system. However, DC charging piles are typically located outdoors in harsh operating environments, subject to numerous external constraints such as catkins and dust. Therefore, filters must be installed at the heat dissipation outlets to block the heat. However, this can still lead to filter clogging, requiring timely cleaning.

[0003] With the continuous rise of the stock market of charging piles, the daily maintenance of charging piles will be an unavoidable issue. In the process of daily maintenance of charging piles, regular cleaning and replacement of filters are the focus of maintenance work, which requires charging station operators to invest a lot of manpower and material resources. It is of great significance to put charging piles with filter blockage warning function into use.

[0004] Currently, while efforts to optimize the cooling system have been made by modifying the charging pile cabinet structure and optimizing the filter configuration, the problem of filter clogging still exists, requiring regular replacement. This leads to untimely filter replacement, poor cooling, and the charging pile being out of service. Furthermore, excessive cleaning and filter replacement wastes manpower and financial resources. Furthermore, improvements to the charging pile protection level and liquid cooling methods still result in high equipment investment and costs, resulting in low economic benefits in station construction and operation. Summary of the Invention

[0005] The object of the present invention is to provide a DC charging pile and its filter clogging detection device and method, so as to solve at least one of the problems of poor heat dissipation and charging pile shutdown caused by untimely replacement of the charging pile filter, and low operation and maintenance efficiency and high cost caused by excessive cleaning of the filter or improvement of the protection level.

[0006] The present invention solves the above technical problems through the following technical solutions: a DC charging pile filter blockage detection device, the detection device comprising:

[0007] A temperature acquisition unit, configured to collect charging temperature data during each charging operation; wherein the charging temperature data includes the ambient temperature of the charging pile, the air inlet temperature of the charging pile at the start of charging, and the air outlet temperature of the charging pile at the end of charging;

[0008] a storage unit for storing a preset charging pile filter status database; wherein the charging pile filter status database includes a temperature difference threshold value for a certain period of time when the charging pile is charged at different ambient temperatures and different charging power levels, the temperature difference threshold value being equal to the difference between the charging pile air outlet temperature at the end of charging and the charging pile air inlet temperature at the start of charging at the corresponding ambient temperature and corresponding charging power level;

[0009] The control unit is used to obtain the charging time and charging power of each charge; and determine the status of the charging pile filter according to the charging time, charging power, charging temperature data of the same charge and the charging pile filter status database.

[0010] Furthermore, the control unit is used to determine the status of the charging pile filter according to the charging time, charging power, charging temperature data during the same charging and the charging pile filter status database, specifically including:

[0011] Determine whether the data of the corresponding charging time is valid data based on the charging pile ambient temperature, charging time and charging power during each charging and the charging pile filter status database; if not, discard the data of the corresponding charging time;

[0012] If yes, determine the first temperature difference threshold from the charging pile filter status database according to the charging pile ambient temperature, charging time and charging power during the corresponding charging;

[0013] Calculating a first temperature difference based on the temperature of the charging pile air outlet and the temperature of the charging pile air inlet during the corresponding charging operation;

[0014] The charging pile filter status is determined based on the first temperature difference and the first temperature difference threshold.

[0015] Preferably, the control unit is used to determine whether the data at the corresponding charging time is valid data based on the charging pile ambient temperature, charging time and charging power at each charging time and the charging pile filter status database, specifically including:

[0016] Determine whether there is data of the same working condition in the charging pile filter status database according to the charging pile ambient temperature and charging power during each charging and the ambient temperature and charging power in the charging pile filter status database;

[0017] If there is data of the same working condition, it is determined whether the charging time of the corresponding charging is greater than or equal to the charging time of the data of the same working condition in the charging pile filter status database. If so, the data of the corresponding charging is valid data; otherwise, the data of the corresponding charging is invalid data;

[0018] If there is no data for the same operating condition, the data for the corresponding charge is invalid.

[0019] Furthermore, the control unit is used to determine the status of the charging pile filter according to the charging time, charging power, charging temperature data during the same charging and the charging pile filter status database, specifically including:

[0020] Select valid charging data from the charging data within a period of time according to the ambient temperature, charging power, and charging time corresponding to the temperature difference threshold in the charging pile filter status database; wherein the charging data includes charging temperature data, charging time, and charging power during each charging;

[0021] Calculating a second temperature difference based on the charging pile air outlet temperature and the charging pile air inlet temperature in the valid charging data;

[0022] The charging pile filter status is determined based on the second temperature difference and the temperature difference threshold.

[0023] Based on the same concept, the present invention provides a method for detecting filter blockage in a DC charging pile, comprising:

[0024] Constructing a charging pile filter status database; wherein the charging pile filter status database includes a temperature difference threshold value for a certain period of time when the charging pile is charged at different ambient temperatures and different charging power, wherein the temperature difference threshold value is equal to the difference between the charging pile air outlet temperature at the end of charging and the charging pile air inlet temperature at the start of charging at the corresponding ambient temperature and corresponding charging power;

[0025] Obtain charging data for each charge; wherein the charging data includes charging time, charging power, and charging temperature data; the charging temperature data includes the charging pile ambient temperature, the charging pile air inlet temperature at the start of charging, and the charging pile air outlet temperature at the end of charging;

[0026] The charging pile filter status is determined based on the charging data during the same charging and the charging pile filter status database.

[0027] Furthermore, judging the status of the charging pile filter according to the charging data during the same charging and the charging pile filter status database includes:

[0028] Determine whether the charging data of the corresponding charging time is valid data according to the charging data of each charging time and the charging pile filter status database; if not, discard the charging data of the corresponding charging time;

[0029] If yes, determine the first temperature difference threshold from the charging pile filter status database according to the charging pile ambient temperature, charging time and charging power during the corresponding charging;

[0030] Calculating a first temperature difference based on the temperature of the charging pile air outlet and the temperature of the charging pile air inlet during the corresponding charging operation;

[0031] The charging pile filter status is determined based on the first temperature difference and the first temperature difference threshold.

[0032] Furthermore, judging whether the charging data of each charging time is valid data according to the charging data of each charging time and the charging pile filter status database specifically includes:

[0033] Determine whether there is data of the same working condition in the charging pile filter status database according to the charging pile ambient temperature and charging power during each charging and the ambient temperature and charging power in the charging pile filter status database;

[0034] If there is data of the same working condition, it is determined whether the charging time of the corresponding charging is greater than or equal to the charging time of the data of the same working condition in the charging pile filter status database. If so, the charging data of the corresponding charging is valid data; otherwise, the charging data of the corresponding charging is invalid data;

[0035] If there is no data for the same operating condition, the charging data for the corresponding charging time is invalid data.

[0036] Further, judging the state of the charging pile filter according to the first temperature difference and the first temperature difference threshold specifically includes:

[0037] When (1-r1%)ΔT T1 ≤ΔT1≤(1+r1%)ΔT T1 When , the charging pile filter is in a healthy state;

[0038] When ΔT T1 ×r2%≤|ΔT1-ΔT T1 |, the charging pile filter is slightly clogged and needs to be cleaned;

[0039] When ΔT T1 ×r3%≤|ΔT1-ΔT T1 |, the charging pile filter is in a serious clogged state and needs to be replaced;

[0040] Wherein, ΔT1 represents the first temperature difference; ΔT T1 represents the first temperature difference threshold; r1, r2, and r3 represent percentage thresholds respectively, and r1<r2<r3.

[0041] Furthermore, judging the status of the charging pile filter according to the charging data during the same charging and the charging pile filter status database includes:

[0042] Select valid charging data from the charging data within a period of time according to the ambient temperature, charging power and charging time corresponding to the temperature difference threshold in the charging pile filter status database;

[0043] Calculating a second temperature difference based on the charging pile air outlet temperature and the charging pile air inlet temperature in the valid charging data;

[0044] The charging pile filter status is determined based on the second temperature difference and the temperature difference threshold.

[0045] Further, judging the status of the charging pile filter according to the second temperature difference and the temperature difference threshold specifically includes:

[0046] When (1-r1%)ΔT T ≤ΔT2≤(1+r1%)ΔT T When , the charging pile filter is in a healthy state;

[0047] When ΔT T ×r2%≤|ΔT2-ΔT T |, the charging pile filter is slightly clogged and needs to be cleaned;

[0048] When ΔT T ×r3%≤|ΔT2-ΔT T |, the charging pile filter is in a serious clogged state and needs to be replaced;

[0049] Wherein, ΔT2 represents the second temperature difference; ΔT T represents the temperature difference threshold; r1, r2, and r3 represent percentage thresholds respectively, and r1<r2<r3.

[0050] Based on the same concept, the present invention further provides a DC charging pile, which includes the DC charging pile filter clogging detection device as described above.

[0051] Beneficial effects

[0052] Compared with the prior art, the advantages of the present invention are:

[0053] The present invention can detect the status of the charging pile filter according to the charging data at each charging and the charging pile filter status database, and then clean or replace the filter according to the filter status, thereby realizing automatic and real-time detection of the filter status. It not only avoids the problem of poor heat dissipation effect and charging pile exiting operation due to untimely filter replacement, but also avoids the problem of low operation and maintenance efficiency and high cost due to excessive cleaning of the filter or improvement of the protection level.

[0054] The present invention can also detect the status of the charging pile filter based on the charging data within a period of time and the charging pile filter status database, and then clean or replace the filter according to the filter status, thereby realizing automatic detection of the filter status, improving the efficiency of filter status detection, reducing the investment of manpower and material resources, and improving the economic benefits of charging station operation. It not only avoids the problem of poor heat dissipation effect and charging pile exiting operation due to untimely filter replacement, but also avoids the problem of low operation and maintenance efficiency and high cost due to excessive cleaning of the filter or improvement of the protection level. BRIEF DESCRIPTION OF THE DRAWINGS

[0055] In order to more clearly illustrate the technical solution of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only one embodiment of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0056] Figure 1 This is a structural block diagram of a device for detecting filter blockage in a DC charging pile according to an embodiment of the present invention;

[0057] Figure 2 This is a flow chart of a method for detecting filter blockage in a DC charging pile according to an embodiment of the present invention. DETAILED DESCRIPTION

[0058] The following is a clear and complete description of the technical solutions of the present invention in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts are within the scope of protection of the present invention.

[0059] The following specific embodiments are used to describe the technical solution of the present application in detail. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be described in detail in some embodiments.

[0060] Example 1

[0061] like Figure 1 As shown, a DC charging pile filter clogging detection device provided by an embodiment of the present invention includes a temperature acquisition unit, a storage unit and a control unit; the temperature acquisition unit and the storage unit are respectively connected to the control unit.

[0062] The temperature collection unit is used to collect charging temperature data during each charge; the charging temperature data includes the ambient temperature of the charging pile, the temperature of the charging pile air inlet at the start of charging, and the temperature of the charging pile air outlet at the end of charging. In this embodiment, the temperature collection unit includes a first temperature sensor, a second temperature sensor, and a third temperature sensor. The first temperature sensor is located in the environment of the charging pile and is used to collect the ambient temperature of the charging pile during each charge. The second temperature sensor is located at the air inlet of the charging pile cabinet and is used to collect the temperature of the charging pile air inlet at the start of each charge. The third temperature sensor is located at the air outlet of the charging pile cabinet and is used to collect the temperature of the charging pile air outlet at the end of each charge.

[0063] During each charging, the control unit records the charging time and the charging power. Therefore, during each charging, the charging data acquired by the control unit includes the charging time, the charging power and the charging temperature data.

[0064] The storage unit is used to store a preset charging pile filter status database. The charging pile filter status database is pre-constructed and stored in the storage unit. The charging pile filter status database includes temperature difference thresholds for charging the charging pile for a certain period of time under different ambient temperatures and different charging power. The temperature difference threshold is equal to the difference between the charging pile outlet temperature at the end of charging under the corresponding ambient temperature and corresponding charging power and the charging pile inlet temperature at the beginning of charging. In a specific embodiment of the present invention, the specific construction process of the charging pile filter status database is as follows:

[0065] Step A1: Determine the operating temperature range of the charging pile and the number of charging cables in the charging pile.

[0066] In this embodiment, the operating environment temperature range of the charging pile is -20°C to 50°C, and usually a single charging pile has two charging guns.

[0067] Step A2: Determine the charging pile operating condition based on the operating ambient temperature range of the charging pile and the number of charging guns of the charging pile.

[0068] The working environment temperature range is divided into levels of 1°C each, resulting in multiple ambient temperature levels. The charging power is divided according to the number of charging guns in the charging pile, resulting in multiple charging power levels. Multiple charging pile operating conditions are obtained based on different ambient temperature levels and charging power levels.

[0069] For example, if the number n of charging guns of the charging pile is 2, the charging power is P / 2 and P, where P represents full power, that is, the charging power when one charging gun is working and the charging power when two charging guns are working at the same time.

[0070] Step A3: Under each charging pile operating condition, the charging pile is continuously charged for Kt minutes, and the charging pile air inlet temperature at the start of charging and the charging pile air outlet temperature at the end of charging are detected.

[0071] Under normal circumstances, electric vehicles take 30 to 40 minutes to charge, and the charging pile has not yet reached the thermal stability stage. Taking all factors into consideration, Kt is the time it takes for the charging pile to be in the temperature rise stage and suitable for most operating scenarios. In this embodiment, Kt is set to 20 minutes.

[0072] Step A4: Calculate the difference between the air outlet temperature of the charging pile at the end of charging and the air inlet temperature of the charging pile at the start of charging under each charging pile operating condition to obtain a temperature difference threshold under each charging operating condition;

[0073] Step A5: Construct a charging pile filter status database based on the temperature difference threshold under each charging condition, as shown in Table 1.

[0074] Table 1 Charging pile filter status database

[0075]

[0076] When detecting the temperature of the charging pile air outlet at the end of charging and the temperature of the charging pile air inlet at the start of charging, multiple detections can be performed, and then the average of the multiple detected temperatures is used as the final temperature. For example, for the charging pile air inlet temperature at the start of charging, the charging pile air inlet temperature is detected once at the start time t, the charging pile air inlet temperature is detected once at t+1s, the charging pile air inlet temperature is detected once at t+2s, the charging pile air inlet temperature is detected once at t+3s, the charging pile air inlet temperature is detected once at t+4s, and the charging pile air inlet temperature is detected once at t+5s. The average of these charging pile air inlet temperatures is calculated, and the average value is used as the final charging pile air inlet temperature.

[0077] The control unit is used to determine the status of the charging pile filter based on the charging data during the same charging and the charging pile filter status database. In a specific embodiment of the present invention, the control unit is used to determine the status of the charging pile filter based on the charging time, charging power, charging temperature data during the same charging and the charging pile filter status database, specifically including:

[0078] Determine whether the data from the corresponding charging session is valid based on the ambient temperature, charging duration, charging power, and the charging station filter status database during each charging session; if not, discard the data from the corresponding charging session;

[0079] If so, determine the first temperature difference threshold from the charging pile filter status database based on the charging pile ambient temperature, charging time and charging power during the corresponding charging; calculate the first temperature difference based on the charging pile outlet temperature and the charging pile inlet temperature during the corresponding charging; and judge the charging pile filter status based on the first temperature difference and the first temperature difference threshold.

[0080] In a specific embodiment of the present invention, the control unit is used to determine whether the data at the corresponding charging time is valid data based on the charging pile ambient temperature, charging time and charging power during each charging, and the charging pile filter status database, specifically including:

[0081] Determine whether there is data of the same working condition in the charging pile filter status database based on the charging pile ambient temperature and charging power during each charging and the ambient temperature and charging power in the charging pile filter status database;

[0082] If there is data with the same working condition, determine whether the charging time of the corresponding charging is greater than or equal to the charging time of the data with the same working condition in the charging pile filter status database. If so, the data of the corresponding charging is valid data; otherwise, the data of the corresponding charging is invalid data; if there is no data with the same working condition, the data of the corresponding charging is invalid data.

[0083] For example, assuming that the ambient temperature of the charging pile during a certain charging is 25°C, the charging time is 23 minutes, and the charging power is P / 2, the corresponding operating conditions are found in the charging pile filter status database based on the ambient temperature of the charging pile being 25°C and the charging power being P / 2 (i.e., the operating conditions corresponding to the ambient temperature of 25°C and the charging power being P / 2 in Table 1), and then the charging time is 23 minutes > Kt (Kt = 20), then the charging data during this charging is valid data.

[0084] For example, assuming that the ambient temperature of the charging pile during a certain charging is 25°C, the charging time is 18 minutes, and the charging power is P / 2, the corresponding operating conditions are found in the charging pile filter status database based on the ambient temperature of the charging pile being 25°C and the charging power being P / 2 (i.e., the operating conditions corresponding to the ambient temperature of 25°C and the charging power being P / 2 in Table 1), and then the charging time is 18 minutes < Kt (Kt = 20), then the charging data during this charging is invalid data.

[0085] In a specific embodiment of the present invention, the control unit is configured to determine the state of the charging pile filter according to the first temperature difference and the first temperature difference threshold, specifically including:

[0086] When (1-r1%)ΔT T1 ≤ΔT1≤(1+r1%)ΔT T1 When , the charging pile filter is in a healthy state;

[0087] When ΔTT1 ×r2%≤|ΔT1-ΔT T1 |, the charging pile filter is slightly clogged and needs to be cleaned;

[0088] When ΔT T1 ×r3%≤|ΔT1-ΔT T1 |, the charging pile filter is in a serious clogged state and needs to be replaced;

[0089] Wherein, ΔT1 represents the first temperature difference; ΔT T1 represents the first temperature difference threshold; r1, r2, and r3 represent percentage thresholds respectively, and r1<r2<r3. In this embodiment, r1=5, r2=10, and r3=15.

[0090] In another embodiment of the present invention, the control unit is configured to determine the status of the charging pile filter based on the charging time, charging power, charging temperature data, and the charging pile filter status database during the same charging process, specifically including:

[0091] Select valid charging data from the charging data within a period of time based on the ambient temperature, charging power and charging time corresponding to the temperature difference threshold in the charging pile filter status database; calculate the second temperature difference based on the charging pile outlet temperature and the charging pile inlet temperature in the valid charging data; and determine the charging pile filter status based on the second temperature difference and the temperature difference threshold.

[0092] For example, a period of time is 1 day, and there are charging data of N charging times within 1 day. The charging data of a single charge that has the same operating condition as a certain operating condition in the charging pile filter status database and a charging time greater than or equal to Kt corresponding to the operating condition is screened out from the charging data of the N charging times. The charging data of the single charge is used as the valid charging data, and the second temperature difference is calculated based on the valid charging data. The second temperature difference is compared with the temperature difference threshold corresponding to the operating condition to determine the status of the charging pile filter.

[0093] In a specific embodiment of the present invention, the control unit is used to determine the status of the charging pile filter according to the second temperature difference and the temperature difference threshold, specifically including:

[0094] When (1-r1%)ΔT T ≤ΔT2≤(1+r1%)ΔT T When , the charging pile filter is in a healthy state;

[0095] When ΔT T ×r2%≤|ΔT2-ΔT T |, the charging pile filter is slightly clogged and needs to be cleaned;

[0096] When ΔT T ×r3%≤|ΔT2-ΔT T|, the charging pile filter is in a serious clogged state and needs to be replaced;

[0097] Wherein, ΔT2 represents the second temperature difference; ΔT T represents the temperature difference threshold; r1, r2, and r3 represent percentage thresholds respectively, and r1<r2<r3.

[0098] Example 2

[0099] like Figure 2 As shown, a method for detecting filter blockage in a DC charging pile provided by an embodiment of the present invention includes the following steps:

[0100] Step 1: Build a charging pile filter status database.

[0101] The charging pile filter status database includes temperature difference thresholds for charging the charging pile for a certain period of time under different ambient temperatures and different charging power. The temperature difference threshold is equal to the difference between the charging pile outlet temperature at the end of charging and the charging pile inlet temperature at the start of charging under the corresponding ambient temperature and corresponding charging power. In a specific embodiment of the present invention, the specific construction process of the charging pile filter status database is as follows:

[0102] Step A1: Determine the operating temperature range of the charging pile and the number of charging cables in the charging pile.

[0103] In this embodiment, the operating environment temperature range of the charging pile is -20°C to 50°C, and usually a single charging pile has two charging guns.

[0104] Step A2: Determine the charging pile operating condition based on the operating ambient temperature range of the charging pile and the number of charging guns of the charging pile.

[0105] The working environment temperature range is divided into levels of 1°C each, resulting in multiple ambient temperature levels. The charging power is divided according to the number of charging guns in the charging pile, resulting in multiple charging power levels. Multiple charging pile operating conditions are obtained based on different ambient temperature levels and charging power levels.

[0106] For example, if the number n of charging guns of the charging pile is 2, the charging power is P / 2 and P, where P represents full power, that is, the charging power when one charging gun is working and the charging power when two charging guns are working at the same time.

[0107] Step A3: Under each charging pile operating condition, the charging pile is continuously charged for Kt minutes, and the charging pile air inlet temperature at the start of charging and the charging pile air outlet temperature at the end of charging are detected.

[0108] Under normal circumstances, electric vehicles take 30 to 40 minutes to charge, and the charging pile has not yet reached the thermal stability stage. Taking all factors into consideration, Kt is the time it takes for the charging pile to be in the temperature rise stage and suitable for most operating scenarios. In this embodiment, Kt is set to 20 minutes.

[0109] Step A4: Calculate the difference between the air outlet temperature of the charging pile at the end of charging and the air inlet temperature of the charging pile at the start of charging under each charging pile operating condition to obtain a temperature difference threshold under each charging operating condition;

[0110] Step A5: Construct a charging pile filter status database based on the temperature difference threshold under each charging condition, as shown in Table 1.

[0111] Step 2: Get the charging data for each charge.

[0112] Charging data includes charging time, charging power, and charging temperature data; charging temperature data includes the ambient temperature of the charging pile, the air inlet temperature of the charging pile at the start of charging, and the air outlet temperature of the charging pile at the end of charging. A temperature acquisition unit is used to collect charging temperature data during each charging. In this embodiment, the temperature acquisition unit includes a first temperature sensor, a second temperature sensor, and a third temperature sensor. The first temperature sensor is located in the environment where the charging pile is located and is used to collect the ambient temperature of the charging pile during each charging. The second temperature sensor is located at the air inlet on the charging pile cabinet and is used to collect the air inlet temperature of the charging pile at the start of charging during each charging. The third temperature sensor is located at the air outlet on the charging pile cabinet and is used to collect the air outlet temperature of the charging pile at the end of charging during each charging.

[0113] During each charging, the control unit also records the charging time and charging power.

[0114] Step 3: Determine the status of the charging pile filter based on the charging data of the same charging and the charging pile filter status database.

[0115] There are two implementation methods for judging the status of the charging pile filter based on the charging data of the same charging and the charging pile filter status database. The first is to judge the status of the charging pile filter in real time based on the charging data of each charging; the second is to judge the status of the charging pile filter based on the charging data of a certain charging among the charging data of multiple charging within a period of time.

[0116] In a first specific embodiment of the present invention, judging the status of the charging pile filter according to the charging data during the same charging and the charging pile filter status database specifically includes:

[0117] Determine whether the data from the corresponding charging session is valid based on the ambient temperature, charging duration, charging power, and the charging station filter status database during each charging session; if not, discard the data from the corresponding charging session;

[0118] If so, determine the first temperature difference threshold from the charging pile filter status database based on the charging pile ambient temperature, charging time and charging power during the corresponding charging; calculate the first temperature difference based on the charging pile outlet temperature and the charging pile inlet temperature during the corresponding charging; and judge the charging pile filter status based on the first temperature difference and the first temperature difference threshold.

[0119] In a specific embodiment of the present invention, whether the data at the corresponding charging time is valid data is determined based on the charging pile ambient temperature, charging time and charging power during each charging, and the charging pile filter status database, specifically including:

[0120] Determine whether there is data of the same working condition in the charging pile filter status database based on the charging pile ambient temperature and charging power during each charging and the ambient temperature and charging power in the charging pile filter status database;

[0121] If there is data with the same working condition, determine whether the charging time of the corresponding charging is greater than or equal to the charging time of the data with the same working condition in the charging pile filter status database. If so, the data of the corresponding charging is valid data; otherwise, the data of the corresponding charging is invalid data; if there is no data with the same working condition, the data of the corresponding charging is invalid data.

[0122] For example, assuming that the ambient temperature of the charging pile during a certain charging is 25°C, the charging time is 23 minutes, and the charging power is P / 2, the corresponding operating conditions are found in the charging pile filter status database based on the ambient temperature of the charging pile being 25°C and the charging power being P / 2 (i.e., the operating conditions corresponding to the ambient temperature of 25°C and the charging power being P / 2 in Table 1), and then the charging time is 23 minutes > Kt (Kt = 20), then the charging data during this charging is valid data.

[0123] For example, assuming that the ambient temperature of the charging pile during a certain charging is 25°C, the charging time is 18 minutes, and the charging power is P / 2, the corresponding operating conditions are found in the charging pile filter status database based on the ambient temperature of the charging pile being 25°C and the charging power being P / 2 (i.e., the operating conditions corresponding to the ambient temperature of 25°C and the charging power being P / 2 in Table 1), and then the charging time is 18 minutes < Kt (Kt = 20), then the charging data during this charging is invalid data.

[0124] In a specific embodiment of the present invention, judging the state of the charging pile filter according to the first temperature difference and the first temperature difference threshold specifically includes:

[0125] When (1-r1%)ΔT T1 ≤ΔT1≤(1+r1%)ΔT T1 When , the charging pile filter is in a healthy state;

[0126] When ΔT T1 ×r2%≤|ΔT1-ΔT T1 |, the charging pile filter is slightly clogged and needs to be cleaned;

[0127] When ΔT T1 ×r3%≤|ΔT1-ΔT T1 |, the charging pile filter is in a serious clogged state and needs to be replaced;

[0128] Wherein, ΔT1 represents the first temperature difference; ΔT T1 represents the first temperature difference threshold; r1, r2, and r3 represent percentage thresholds respectively, and r1<r2<r3. In this embodiment, r1=5, r2=10, and r3=15.

[0129] In a second specific embodiment of the present invention, the status of the charging pile filter is determined based on the charging data during the same charging and the charging pile filter status database, specifically including:

[0130] Select valid charging data from the charging data within a period of time based on the ambient temperature, charging power and charging time corresponding to the temperature difference threshold in the charging pile filter status database; calculate the second temperature difference based on the charging pile outlet temperature and the charging pile inlet temperature in the valid charging data; and determine the charging pile filter status based on the second temperature difference and the temperature difference threshold.

[0131] For example, a period of time is 1 day, and there are charging data of N charging times within 1 day. The charging data of a single charge that has the same operating condition as a certain operating condition in the charging pile filter status database and a charging time greater than or equal to Kt corresponding to the operating condition is screened out from the charging data of the N charging times. The charging data of the single charge is used as the valid charging data, and the second temperature difference is calculated based on the valid charging data. The second temperature difference is compared with the temperature difference threshold corresponding to the operating condition to determine the status of the charging pile filter.

[0132] In a specific embodiment of the present invention, judging the status of the charging pile filter according to the second temperature difference and the temperature difference threshold specifically includes:

[0133] When (1-r1%)ΔT T ≤ΔT2≤(1+r1%)ΔT T When , the charging pile filter is in a healthy state;

[0134] When ΔT T ×r2%≤|ΔT2-ΔT T |, the charging pile filter is slightly clogged and needs to be cleaned;

[0135] When ΔT T ×r3%≤|ΔT2-ΔT T|, the charging pile filter is in a serious clogged state and needs to be replaced;

[0136] Wherein, ΔT2 represents the second temperature difference; ΔT T represents the temperature difference threshold; r1, r2, and r3 represent percentage thresholds respectively, and r1<r2<r3.

[0137] In a specific embodiment of the present invention, when the charging pile filter is in a slightly blocked state or a seriously blocked state, an alarm is issued to prompt that the filter needs to be cleaned or replaced.

[0138] The above disclosure is only a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with this technical field can easily think of changes or modifications within the technical scope disclosed in the present invention, and they should all be covered by the scope of protection of the present invention.

Claims

1. A DC charging pile filter blockage detection device, characterized in that: The detection device comprises: A temperature acquisition unit, configured to collect charging temperature data during each charging operation; wherein the charging temperature data includes the ambient temperature of the charging pile, the air inlet temperature of the charging pile at the start of charging, and the air outlet temperature of the charging pile at the end of charging; a storage unit for storing a preset charging pile filter status database; wherein the charging pile filter status database includes a temperature difference threshold value for a certain period of time when the charging pile is charged at different ambient temperatures and different charging power levels, the temperature difference threshold value being equal to the difference between the charging pile air outlet temperature at the end of charging and the charging pile air inlet temperature at the start of charging at the corresponding ambient temperature and corresponding charging power level; A control unit is used to obtain the charging time and charging power of each charge; and determine the status of the charging pile filter according to the charging time, charging power, charging temperature data of the same charge and the charging pile filter status database; The specific construction process of the charging pile filter status database includes: Step A1: Determine the operating temperature range of the charging pile and the number of charging guns in the charging pile; Step A2: Determine the charging pile operating condition based on the operating ambient temperature range of the charging pile and the number of charging guns in the charging pile; Step A3: Under each charging pile operating condition, the charging pile is continuously charged for Kt minutes, and the charging pile air inlet temperature at the start of charging and the charging pile air outlet temperature at the end of charging are detected; Step A4: Calculate the difference between the air outlet temperature of the charging pile at the end of charging and the air inlet temperature of the charging pile at the start of charging under each charging pile operating condition to obtain a temperature difference threshold under each charging operating condition; Step A5: Build a charging pile filter status database based on the temperature difference threshold under each charging condition; Among them, the charging pile filter status is judged according to the charging time, charging power, charging temperature data during the same charging and the charging pile filter status database, specifically including: determining the valid charging data and temperature threshold according to the charging pile ambient temperature, charging time, charging power and the charging pile filter status database; judging the charging pile filter status according to the valid charging data and temperature threshold.

2. The DC charging pile filter blockage detection device according to claim 1, characterized in that: The control unit is used to determine the status of the charging pile filter according to the charging time, charging power, charging temperature data and the charging pile filter status database during the same charging, specifically including: Determine whether the data of the corresponding charging time is valid charging data based on the charging pile ambient temperature, charging time and charging power during each charging and the charging pile filter status database; if not, discard the data of the corresponding charging time; If yes, determine the first temperature difference threshold from the charging pile filter status database according to the charging pile ambient temperature, charging time and charging power during the corresponding charging; Calculating a first temperature difference based on the charging pile air outlet temperature and the charging pile air inlet temperature in the valid charging data; The charging pile filter status is determined based on the first temperature difference and the first temperature difference threshold.

3. The DC charging pile filter blockage detection device according to claim 2, characterized in that: The control unit is used to determine whether the data of the corresponding charging is valid charging data based on the charging pile ambient temperature, charging time and charging power during each charging and the charging pile filter status database, specifically including: Determine whether there is data of the same working condition in the charging pile filter status database according to the charging pile ambient temperature and charging power during each charging and the ambient temperature and charging power in the charging pile filter status database; If there is data of the same working condition, it is determined whether the charging time of the corresponding charging time is greater than or equal to the charging time of the data of the same working condition in the charging pile filter status database. If so, the data of the corresponding charging time is valid charging data; otherwise, the data of the corresponding charging time is invalid charging data; If there is no data for the same operating condition, the data for the corresponding charge is invalid charging data.

4. The DC charging pile filter blockage detection device according to claim 1, characterized in that: The control unit is used to determine the status of the charging pile filter according to the charging time, charging power, charging temperature data and the charging pile filter status database during the same charging, specifically including: Select valid charging data from the charging data within a period of time according to the ambient temperature, charging power, and charging time corresponding to the temperature difference threshold in the charging pile filter status database; wherein the charging data includes charging temperature data, charging time, and charging power during each charging; Calculating a second temperature difference based on the charging pile air outlet temperature and the charging pile air inlet temperature in the valid charging data; The charging pile filter status is determined based on the second temperature difference and the temperature difference threshold.

5. A method for detecting filter blockage in a DC charging pile, characterized in that: The detection method comprises: Constructing a charging pile filter status database; wherein the charging pile filter status database includes a temperature difference threshold value for a certain period of time when the charging pile is charged at different ambient temperatures and different charging power, wherein the temperature difference threshold value is equal to the difference between the charging pile air outlet temperature at the end of charging and the charging pile air inlet temperature at the start of charging at the corresponding ambient temperature and corresponding charging power; Obtain charging data for each charge; wherein the charging data includes charging time, charging power, and charging temperature data; the charging temperature data includes the charging pile ambient temperature, the charging pile air inlet temperature at the start of charging, and the charging pile air outlet temperature at the end of charging; Determine the status of the charging pile filter based on the charging data during the same charging and the charging pile filter status database; The specific construction process of the charging pile filter status database includes: Step A1: Determine the operating temperature range of the charging pile and the number of charging guns in the charging pile; Step A2: Determine the charging pile operating condition based on the operating ambient temperature range of the charging pile and the number of charging guns in the charging pile; Step A3: Under each charging pile operating condition, the charging pile is continuously charged for Kt minutes, and the charging pile air inlet temperature at the start of charging and the charging pile air outlet temperature at the end of charging are detected; Step A4: Calculate the difference between the air outlet temperature of the charging pile at the end of charging and the air inlet temperature of the charging pile at the start of charging under each charging pile operating condition to obtain a temperature difference threshold under each charging operating condition; Step A5: Build a charging pile filter status database based on the temperature difference threshold under each charging condition; Among them, judging the status of the charging pile filter according to the charging data during the same charging and the charging pile filter status database specifically includes: determining the valid charging data and temperature threshold according to the charging pile ambient temperature, charging time, charging power and the charging pile filter status database; judging the status of the charging pile filter according to the valid charging data and temperature threshold.

6. The method for detecting filter blockage of a DC charging pile according to claim 5, characterized in that: Determining the status of the charging pile filter according to the charging data of the same charging and the charging pile filter status database includes: Determine whether the charging data of the corresponding charging time is valid charging data according to the charging data of each charging time and the charging pile filter status database; if not, discard the charging data of the corresponding charging time; If yes, determine the first temperature difference threshold from the charging pile filter status database according to the charging pile ambient temperature, charging time and charging power during the corresponding charging; Calculating a first temperature difference based on the charging pile air outlet temperature and the charging pile air inlet temperature in the valid charging data; The charging pile filter status is determined based on the first temperature difference and the first temperature difference threshold.

7. The method for detecting filter blockage of a DC charging pile according to claim 6, characterized in that: Determining whether the charging data at each charging time is valid charging data based on the charging data at each charging time and the charging pile filter status database specifically includes: Determine whether there is data of the same working condition in the charging pile filter status database according to the charging pile ambient temperature and charging power during each charging and the ambient temperature and charging power in the charging pile filter status database; If there is data of the same working condition, it is determined whether the charging time of the corresponding charging is greater than or equal to the charging time of the data of the same working condition in the charging pile filter status database. If so, the charging data of the corresponding charging is valid charging data; otherwise, the charging data of the corresponding charging is invalid charging data; If there is no data for the same operating condition, the charging data for the corresponding charging time is invalid charging data.

8. The method for detecting filter blockage of a DC charging pile according to claim 6 or 7, characterized in that: Determining the state of the charging pile filter according to the first temperature difference and the first temperature difference threshold specifically includes: When (1-r1%)ΔT T1 ≤ΔT1≤(1+r1%)ΔT T1 When , the charging pile filter is in a healthy state; When ΔT T1 ×r2%≤|ΔT1-ΔT T1 |, the charging pile filter is slightly clogged and needs to be cleaned; When ΔT T1 ×r3%≤|ΔT1-ΔT T1 |, the charging pile filter is in a serious clogged state and needs to be replaced; Wherein, ΔT1 represents the first temperature difference; ΔT T1 represents the first temperature difference threshold; r1, r2, and r3 represent percentage thresholds respectively, and r1<r2<r3.

9. The method for detecting filter blockage of a DC charging pile according to claim 5, characterized in that: Determining the status of the charging pile filter according to the charging data of the same charging and the charging pile filter status database includes: Select valid charging data from the charging data within a period of time according to the ambient temperature, charging power and charging time corresponding to the temperature difference threshold in the charging pile filter status database; Calculating a second temperature difference based on the charging pile air outlet temperature and the charging pile air inlet temperature in the valid charging data; The charging pile filter status is determined based on the second temperature difference and the temperature difference threshold.

10. The method for detecting filter blockage of a DC charging pile according to claim 9, characterized in that: Determining the status of the charging pile filter according to the second temperature difference and the temperature difference threshold specifically includes: When (1-r1%)ΔT T ≤ΔT2≤(1+r1%)ΔT T When , the charging pile filter is in a healthy state; When ΔT T ×r2%≤|ΔT2-ΔT T |, the charging pile filter is slightly clogged and needs to be cleaned; When ΔT T ×r3%≤|ΔT2-ΔT T |, the charging pile filter is in a serious clogged state and needs to be replaced; Wherein, ΔT2 represents the second temperature difference; ΔT T represents the temperature difference threshold; r1, r2, and r3 represent percentage thresholds respectively, and r1<r2<r3.

11. A DC charging pile, characterized in that: The DC charging pile includes the DC charging pile filter clogging detection device according to any one of claims 1 to 4.

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