Charging Pile Control Method, Control Device and Charging Pile System

Abstract

The present invention discloses a charging pile control method, a control device and a charging pile system, which relate to the technical field of charging pile control. The charging pile includes a charging gun. In the charging pile control method, first, the temperature of the charging gun is obtained, and the temperature rise slope of the charging gun is calculated; then when the temperature rise slope is greater than a preset slope, the charging gun is controlled to be in a non-working state. The present invention aims to provide a charging pile control method, which forms a set of over-temperature protection solutions with perfect functions and multiple redundancies through the cooperation of three mechanisms: software over-temperature protection, hardware over-temperature protection and temperature rise slope protection, so as to improve the safety and reliability of charging equipment.

Description

Technical Field

[0001] The present application relates to the technical field of charging pile control, and particularly to a charging pile control method, a control device and a charging pile system. Background Art

[0002] With the development of new energy vehicles, people's requirements for charging piles are also getting higher and higher. A charging pile can convert the energy of the power grid through power conversion and then transmit it to the power battery pack of an electric vehicle through a charging gun to charge the power battery pack. However, during the charging process of an electric vehicle, if the charging current is too large, a large amount of heat will be generated at the charging interface, cable, and cable connection. The excessive temperature will damage some parts of the charging gun including insulating materials, and even cause a fire. Summary of the Invention

[0003] The main purpose of the present invention is to provide a charging pile control method, a control device and a charging pile system, aiming to provide a charging pile control method to protect the charging gun in the charging pile and improve the reliability and safety of the charging pile system.

[0004] To achieve the above object, the present invention provides a charging pile control method, the charging pile includes a charging gun, and the charging pile control method includes:

[0005] Obtain the temperature of the charging gun and calculate the temperature rise slope of the charging gun;

[0006] When the temperature rise slope is greater than a preset slope, control the charging gun to be in a non-working state

[0007] Optionally, after obtaining the temperature of the charging gun, the charging pile control method further includes:

[0008] When the temperature of the charging gun is greater than a first preset temperature and reaches a first preset duration, reduce the output current of the charging gun to a preset current value or control the charging gun to be in a non-working state; when the temperature of the charging gun is greater than a second preset temperature, control the charging gun to be in a non-working state.

[0009] Optionally, the step of when the temperature of the charging gun is greater than the second preset temperature and controlling the charging gun to be in a non-working state includes:

[0010] When the temperature of the charging gun is greater than the second preset temperature, generate an over-temperature fault signal, and control the charging gun to be in a non-working state according to the over-temperature fault signal.

[0011] Optionally, the step of when the temperature of the charging gun is greater than the first preset temperature and reducing the output current of the charging gun to a preset current value or controlling the charging gun to be in a non-working state specifically includes:

[0012] When the temperature of the charging gun is greater than the first preset temperature, start timing to obtain the first duration;

[0013] When the temperature of the charging gun is less than the first preset temperature, stop timing and clear the first duration to zero;

[0014] When the temperature of the charging gun is greater than the second preset temperature, control the charging gun to be in a non - working state, stop timing, and clear the first duration to zero;

[0015] When the first duration reaches the first preset duration, reduce the output current of the charging gun to a preset current value or control the charging gun to be in a non - working state.

[0016] Optionally, the temperature rise slope of the charging gun is calculated by the following formula:

[0017] ;

[0018] In the formula, is the temperature rise slope of the charging gun;

[0019] is the temperature detected at the first time point;

[0020] is the temperature detected at the second time point;

[0021] is the time interval between the first time point and the second time point.

[0022] The present invention also provides a control device, which includes:

[0023] A memory;

[0024] A processor; and

[0025] A charging pile control program stored on the memory and operable on the processor, and when the processor executes the charging pile control program, it implements the charging pile control method as described in any one of the above.

[0026] The present invention also provides a charging pile system, including the control device as described above.

[0027] In the charging pile control method of the present invention, first obtain the temperature of the charging gun and calculate the temperature rise slope of the charging gun; when the temperature rise slope is greater than the preset slope, control the charging gun to be in a non-working state. In practical applications, when a failure occurs in the charging pile, the temperature rise slope of the charging gun will be higher than the temperature rise slope of the charging gun when the charging pile is working normally, that is, the preset slope. Therefore, when the temperature rise slope is greater than the preset slope, it is determined that a failure has occurred in the charging pile, and the charging gun is controlled to be in a non-working state, that is, triggering a shutdown. This protection includes software-triggered protection and hardware-triggered protection to increase the redundancy of the protection. In this way, it can be ensured that the temperature of the charging gun will not rise to the maximum temperature that the charging gun can withstand when the charging pile is working abnormally, effectively protecting the charging gun, the cable, and the charging battery, etc., avoiding damage to the charging pile caused by high temperature when the charging pile is working abnormally, and improving the working safety of the charging pile system. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0029] Figure 1 It is a flowchart of an embodiment of the charging pile control method of the present invention;

[0030] Figure 2 It is a flowchart of another embodiment of the charging pile control method of the present invention;

[0031] Figure 3 It is a flowchart of still another embodiment of the charging pile control method of the present invention;

[0032] Figure 4 It is a temperature change diagram of the charging gun in an embodiment of the charging pile control method of the present invention;

[0033] Figure 5 It is a flowchart of still another embodiment of the charging pile control method of the present invention.

[0034] The realization, functional characteristics, and advantages of the object of the present invention will be further described in conjunction with the embodiments and with reference to the drawings. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0035] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, rather than all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0036] It should be noted that all the directional indications (such as up, down, left, right, front, back...) in the embodiments of the present invention are only used to explain the relative positional relationship and movement conditions between components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indications will also change accordingly.

[0037] It should be noted that in this text, step codes such as S100 and S200 are adopted. The purpose is to more clearly and briefly express the corresponding content, and it does not constitute a substantial limitation in terms of sequence. Those skilled in the art may execute S200 first and then S100 during specific implementation, etc., but these should all be within the protection scope of this application.

[0038] With the development of new energy vehicles, people's requirements for charging piles are getting higher and higher. A charging pile can transmit the voltage of a charging battery to the storage battery of an electric vehicle through a charging gun to charge the storage battery. However, during the charging process of an electric vehicle, if the charging current is too large, a large amount of heat will be generated at the connection between the cable and the external power supply, reducing the charging efficiency. At the same time, the high temperature will damage the charging gun and even cause a fire.

[0039] It should be noted that since the charging gun, as a bridge between the electric vehicle and the charging pile, will overheat during high-power charging. Once the actual temperature of the charging gun is higher than the temperature that the material of the charging gun itself can withstand, it will damage the charging gun and even make it unable to work properly. Therefore, a charging gun with a cooling system is commonly used. This cooling system can control the liquid coolant to circulate inside the charging gun and the cable to take away the heat generated when the current flows through the charging gun and the charging cable, so as to prevent the charging gun from overheating and improve the charging efficiency and safety. However, in actual applications, when the control device detects that the current temperature of the charging gun exceeds the safety value until the cooling system starts to work, the temperature of the charging gun is still rising. If the cooling system fails, the temperature of the charging gun will rise sharply during high-current charging, which is very likely to cause the actual temperature of the charging gun to exceed the material tolerance temperature. Therefore, the existing solutions still cannot fully protect the charging gun.

[0040] For this reason, the present invention proposes a charging pile control method, refer to Figure 1 , the charging pile includes a charging gun, and the charging pile control method includes:

[0041] Step S100: Obtain the temperature of the charging gun and calculate the temperature rise slope of the charging gun;

[0042] Step S200: When the temperature rise slope is greater than a preset slope, control the charging gun to be in a non-working state.

[0043] In this embodiment, the charging pile control method can be applied to a charging pile system. For example, a memory for storing the charging pile control method of the present invention and a processor for executing the charging pile control method of the present invention are integrated in the control device of the charging pile system. Among them, the control device can be implemented by a main controller, such as an MCU, a DSP (Digital Signal Process, digital signal processing chip), an FPGA (Field Programmable Gate Array, programmable logic gate array chip), a PLC, a SOC (System On Chip, system-level chip), etc.

[0044] Specifically, when it is necessary to obtain the temperature of the charging pile, a thermistor sensor, a thermocouple sensor, a temperature sensor, a platinum resistance temperature sensor, a digital output sensor, etc. can be used, and then the temperature rise slope of the charging gun can be obtained through a software algorithm or a hardware detection circuit. For example, the above-mentioned main controller can convert the temperature of the charging gun output by the temperature sensor into a temperature rise slope that changes with time according to a preset calculation rule.

[0045] In this embodiment, the temperature rise slope of the charging gun is calculated by the following formula:

[0046] ;

[0047] In the formula, is the temperature rise slope of the charging gun;

[0048] is the temperature detected at the first time point;

[0049] is the temperature detected at the second time point;

[0050] is the time interval between the first time point and the second time point.

[0051] Referring to Figure 4 , curve A is the temperature detected by the control device, and curve B is the actual temperature of the charging gun. It can be seen from Figure 4 that when the temperature sensor detects that the current temperature of the charging gun is 100 °C, and the tolerance temperature of the charging gun's own material is 120 °C, and the main controller determines that the charging gun needs to be cooled according to the output result of the temperature sensor and controls the cooling system to work, the actual temperature of the charging gun may have exceeded 120 °C, which will undoubtedly cause damage to the charging gun. In the present invention, Figure 4In [the above], by observing the curve of the temperature rise slope, it can be seen that before the temperature of the charging gun is far lower than 120 °C, if a fault occurs in the charging pile system, such as a cooling system fault, the temperature rise slope of the charging gun will show an increase. Therefore, in the charging pile control solution of the present invention, when the temperature rise slope is greater than a preset slope, the charging gun is controlled to stop working. In this way, before the charging gun reaches the tolerable temperature, it stops working, protecting the charging gun, and thus improving the reliability and safety of the charging pile system operation.

[0052] It should be noted that, referring to Figure 5 , the control device may include a sampling conditioning circuit, an amplification isolation circuit, an AD conversion chip, a CPU, a hardware comparison circuit, a CCU, etc. Among them, the temperature sensor for detecting the temperature of the charging gun can detect the temperature of at least one of the contact areas (DC+, DC-) and the crimping areas (DC+, DC-). In the present invention, the temperature of the internal contact area and / or the crimping area of the charging gun is obtained through the temperature sensor(s) (one or more) and output to the sampling conditioning circuit. After converting the temperature signal (including the internal temperature information of the charging gun) into a voltage signal, a part of it is output to the amplification isolation circuit for amplification and isolation, then converted into a digital signal by the AD conversion chip and enters the CPU, and the internal temperature information of the charging gun collected is transmitted to the charging control unit (CCU) through a communication interface (RS485 or CAN or other communication interfaces). The charging control unit performs charging current limitation or protection according to a pre-set control strategy. For example, when the CPU determines that the temperature of the charging gun is greater than a preset first temperature, it executes a current limiting program or a shutdown program. This part of the protection is the mainstream temperature detection and over-temperature protection mode of current charging devices. In addition, the voltage signal output by the sampling conditioning circuit is also output to the hardware comparison circuit to form a hardware over-temperature protection circuit. For example, the input terminal of the comparator is connected to the output terminal of the sampling conditioning circuit, and the reference terminal of the comparator is connected to a preset protection value (such as the preset first temperature). When the value input to the input terminal of the comparator is greater than the value of the reference terminal of the comparator, the comparator outputs an over-temperature fault signal to the CCU, that is, after detecting that the temperature of any detection point inside the charging gun exceeds the set protection value, the over-temperature fault signal will be immediately fed back to the CCU, and the CCU starts a fault shutdown and delays for a period of time to cut off the main circuit contactor. At the same time, the sampling conditioning circuit outputs to the temperature rise slope generation circuit, where the temperature rise slope generation circuit is used to calculate the temperature rise slope and output it to the hardware comparison circuit. When it is detected that the temperature rise slope of any detection point of the charging gun exceeds the set value, the CCU will activate the over-temperature protection function.

[0053] In this embodiment, since the charging current of the high-power charging system is very large, a liquid cooling solution needs to be adopted. In the high-current charging state, when the cooling system fails, the temperature of the charging gun will rise rapidly. Due to the certain hysteresis of the temperature detection circuit, if only the second part of the hardware comparison circuit is used for over-temperature protection, it may lead to untimely protection, and the internal temperature of the charging gun exceeds the tolerance value of the insulating material, damaging the insulating material of the charging gun and even causing serious accidents. Therefore, the present invention introduces a temperature rise slope protection function for charging devices (including charging piles), and through the cooperation of three mechanisms: software over-temperature protection, hardware over-temperature protection, and temperature rise slope protection, a set of over-temperature protection solutions with perfect functions and multiple redundancies is formed, thereby improving the safety and reliability of charging devices.

[0054] In the charging pile control method of the present invention, first, the temperature of the charging gun is obtained, and the temperature rise slope of the charging gun is calculated; when the temperature rise slope is greater than the preset slope, the charging gun is controlled to be in a non-working state. In practical applications, when a charging pile fails, the temperature rise slope of the charging gun will be higher than the temperature rise slope of the charging gun when the charging pile is working normally, that is, the preset slope. Therefore, when the temperature rise slope is greater than the preset slope, it is determined that the charging pile has failed, and the charging gun is controlled to be in a non-working state, that is, triggering a shutdown. In this way, it can be ensured that the temperature of the charging gun will not rise to the maximum temperature that the charging gun can withstand when the charging pile is working abnormally, effectively protecting the charging gun, cable, and charging battery, etc., and avoiding damage to the charging pile caused by high temperature when the charging pile is working abnormally, improving the safety of the charging pile system.

[0055] In an embodiment of the present invention, after obtaining the temperature of the charging gun, the charging pile control method further includes:

[0056] When the temperature of the charging gun is greater than the first preset temperature and reaches the first preset duration, the output current of the charging gun is reduced to the preset current value or the charging gun is controlled to be in a non-working state; when the temperature of the charging gun is greater than the second preset temperature, the charging gun is controlled to be in a non-working state.

[0057] In this embodiment, a thermistor sensor can be arranged inside the charging gun to detect the temperature of the charging gun. An over-temperature protection unit (TPU) and a charging control unit (CCU) can be arranged inside the control device in the charging pile system. The temperature sampling signal output by the temperature sensor is sent to the TPU. The TPU detects the temperature of the charging gun in real time according to the temperature sampling signal. The first preset temperature, the first preset duration, and the second preset temperature can be set in advance by R & D personnel. Among them, the first preset temperature (such as 70 °C) is used as a warning temperature point to indicate that the charging gun is approaching the upper limit of the safe temperature. The first preset duration (such as 2 minutes), that is, if the temperature of the charging gun remains above 70 °C for 2 consecutive minutes, cooling measures are triggered. For example, the CCU gradually reduces the output current of the charging gun from the current value to a preset safe current value to reduce the heat generation. The second preset temperature (such as 85 °C) is used as an emergency stop temperature point. Once this temperature is reached, the power supply is immediately cut off to ensure safety. In addition, the CCU can also send a notification to an external terminal to inform the user that the charging has been paused and the reason, and it is recommended to check whether the charging device or the environment is normal.

[0058] It can be understood that when the TPU determines that the temperature of the charging gun exceeds the second preset temperature according to the temperature sampling signal, it outputs an over-temperature fault signal to the CCU, and the CCU outputs a control signal to directly trigger a fault shutdown. At the same time, after the set time is extended, the TPU directly switches to the contactor of the charging gun circuit to control the charging gun to be in an abnormal state. Among them, the second preset temperature is lower than the tolerance temperature of the charging gun material, and the second preset temperature can be set in advance by R & D personnel through a hardware circuit.

[0059] In addition, both the over-temperature protection unit (TPU) and the charging control unit (CCU) can be implemented by using the above-mentioned main controller. The over-temperature protection unit (TPU) and the charging control unit (CCU) can be integrated on the same circuit board to reduce the wiring area, or they can be arranged separately.

[0060] Through the above settings, R & D personnel set the second preset temperature in advance so that during the process of the charging gun being in an abnormal state, the actual temperature of the charging gun does not exceed the tolerance temperature (such as 130 °C), which can protect the charging gun, the cable, and the cable connection to a certain extent and improve the safety of the charging pile operation.

[0061] In an embodiment of the present invention, with reference to Figure 2 , the step of reducing the output current of the charging gun to a preset current value or controlling the charging gun to be in a non-operating state when the temperature of the charging gun is greater than the first preset temperature specifically includes:

[0062] Step S111: When the temperature of the charging gun is greater than the first preset temperature, start timing to obtain the first duration;

[0063] Step S112: When the temperature of the charging gun is lower than the first preset temperature, stop timing and clear the first duration to zero.

[0064] Step S113: When the temperature of the charging gun is higher than the second preset temperature, control the charging gun to be in a non - working state, stop timing, and clear the first duration to zero.

[0065] Step S114: When the first duration reaches the first preset duration, reduce the output current of the charging gun to a preset current value or control the charging gun to be in an abnormal working state.

[0066] In this embodiment, combining the content of the above - mentioned embodiment, a timing module can be set in the control device so that when the temperature of the charging gun is higher than the first preset temperature, the timing module starts timing. During the timing process, when it is determined that the temperature of the charging gun is higher than the second preset temperature, it indicates that the internal temperature of the charging gun is close to the tolerance temperature of the charging gun material. To protect the charging gun, the charging gun will be immediately controlled to stop working; when the temperature of the charging gun is lower than the first preset temperature, it indicates that the over - temperature situation of the charging gun has been alleviated and does not affect its normal operation. Therefore, the timing can be cancelled and the normal charging procedure can be entered. It should be noted that a temperature hysteresis value can also be set, that is, when the temperature of the charging gun is lower than the difference between the first preset temperature and the temperature hysteresis value, the timing will stop and the first duration will be cleared to zero. The temperature hysteresis value is to avoid frequent switching between the timing and non - timing states due to the temperature being near the first preset temperature, causing unnecessary consumption to the charging pile system. In this way, the stability and reliability of the charging pile system are improved. Among them, the timing module can be implemented by using a clock chip or the main controller described above. The first preset duration is set in advance by R & D personnel.

[0067] Specifically, if the charging gun has a temperature tolerance of 130°C, the first preset temperature is 90°C, the second preset temperature is 120°C, and the preset temperature hysteresis value is 5°C, when the actual temperature of the charging gun is 91°C, the timing module in the control device has started timing to obtain the first duration. At this time, the charging pile continues to monitor the temperature of the charging gun. If it is detected that the charging gun exceeds 120°C, it will immediately trigger a fault shutdown to control the charging gun in an abnormal state; at the same time, if the charging gun temperature is monitored to be lower than 85°C, it means that the overheating of the charging gun has been alleviated, the timing is terminated and the first duration is reset to zero, and the charging gun can still work normally. If the first duration reaches the first preset duration, the time when the charging gun temperature exceeds 90°C has reached the first preset duration, it may be that the cooling system fails to cool the charging gun or the charging line fails, such as short circuit, loose virtual connection, poor contact, etc. Continuing to charge at the current current may cause damage to the charging gun, so the charging control unit CCU will reduce the output current of the charging gun to the set current value, or directly trigger a fault shutdown to control the charging gun in an abnormal state.

[0068] It should be noted that limiting the output current of the charging gun to the set current value can protect the charging gun and extend the working time of the charging gun as much as possible, so that the charging pile can charge the power battery of the electric vehicle, thereby improving the user's charging experience.

[0069] In another embodiment of the present invention, when the temperature of the charging gun is greater than a first preset temperature, the step of reducing the output current of the charging gun to a preset current value or controlling the charging gun to be in a non-working state specifically includes:

[0070] When the temperature of the charging gun is greater than the first preset temperature, calculating the temperature rise slope of the charging gun in real time to obtain a first temperature rise slope of the charging gun;

[0071] When the first temperature rise slope is greater than a preset slope, the charging gun is controlled to be in a non-working state.

[0072] In this embodiment, in combination with the content of the above embodiment, when the temperature signal is output to the charging control unit CCU, and the CCU determines that the temperature of the charging gun is greater than the first preset temperature, the temperature rise slope generation circuit starts to calculate the temperature rise slope of the charging gun. At any time, if the temperature rise slope of the charging gun is greater than the preset slope, the charging control unit CCU will immediately trigger a fault shutdown and control the charger to be in an abnormal state. In this way, before it is determined that the cooling system fails and may damage the charging gun and the charging cable, by detecting the temperature rise slope, the charging can be stopped before the actual temperature of the charging gun reaches the temperature tolerated by the charging gun material, improving the reliability and safety of the charging pile system. At the same time, compared with the previous embodiment, controlling by adding the temperature rise slope is more accurate than controlling according to the temperature, further improving the accuracy of the charging pile control method of the present invention.

[0073] It should be noted that when the user connects the charging gun in the charging pile to the electric vehicle, the charging gun will start to work, provide a stable charging power by converting and adjusting the voltage and current. Since this process involves energy transfer, the battery of the electric vehicle obtains the power of the charging battery in the charging pile through the charging gun. During this process, the charging gun receives a relatively large amount of power and heat, so the charging gun will deposit heat, resulting in a sharp rise in temperature to reach the normal working temperature. When the ambient temperature is low, for example, when charging an electric vehicle in the outdoor temperature in the north in winter, when the charging gun is just used to charge the electric vehicle, the temperature rise slope of the charging gun will be higher than that of the charging gun at normal room temperature. If it is determined to be a fault shutdown at this time, it is obviously unreasonable.

[0074] Therefore, in an embodiment of the present invention, referring to Figure 3 , when the temperature rise slope is greater than the preset slope, controlling the charging gun to be in a non-working state specifically includes:

[0075] Step S210: When the temperature rise slope is greater than the preset slope, start timing to obtain a second duration;

[0076] Step S220: Continuously monitor the temperature of the charging gun. When the temperature of the charging gun is greater than the preset first temperature, trigger a fault shutdown and control the charging gun to be in an abnormal state;

[0077] Step S230: Continuously monitor the temperature rise slope of the charging gun. When the temperature rise slope of the charging gun is less than (the preset slope - the second hysteresis value), stop timing;

[0078] Step 240: When the second duration reaches the second preset duration, control the charging gun to be in an abnormal state.

[0079] In this embodiment, when the temperature rise slope of the charging gun is greater than the preset slope, it is determined that there may be a fault in the charging pile system. The temperature of the charging gun and the temperature rise slope will be continuously monitored. If within the preset time (the first preset duration), the temperature of the charging gun reaches the first preset temperature, or the time when the temperature rise slope is greater than the preset slope exceeds the preset time (the second preset duration), it indicates that there is a fault in the charging pile system. For example, the cooling system of the charging gun fails or the charging line fails. At this time, the charging gun is controlled to stop working to facilitate the user to troubleshoot and handle the fault in a timely manner. Among them, the first preset duration and the second preset duration are set in advance by the R & D personnel according to actual needs. If the temperature rise slope of the charging gun drops below the difference between the preset slope and the second hysteresis value, it can be determined that the increase in the temperature rise slope is caused by too fast temperature rise at the initial stage of charging, and there is no safety risk, so no fault handling is required, and the charging pile system can work normally to charge the power battery of the electric vehicle. It should be noted that the second hysteresis value is set to avoid frequent state switching when the temperature rise slope is near the preset slope. For example, if the second hysteresis value is not set, when the temperature rise slope just exceeds the preset slope, the system will start timing; and when the temperature rise slope slightly drops below the preset slope, the timing will stop. This frequent state switching not only increases the burden on the system but also may lead to misjudgment. Therefore, by setting a reasonable second hysteresis value, the system can be more stable in the face of temperature fluctuations. Even if there are measurement errors or natural fluctuations, the system will not frequently switch between starting timing and stopping timing.

[0080] Through the above settings, when the temperature rise slope of the charging gun is greater than the preset slope, it is possible to check whether it is due to too low ambient temperature or a fault in the charging pile system, such as a failure of the cooling system to cool the charging gun or a fault in the charging line, such as short circuit, loose or poor contact. In this way, it is possible to avoid triggering a fault shutdown when the temperature rise slope is higher than the preset slope due to too low ambient temperature, and improve the accuracy of the charging pile control method of the present invention.

[0081] The present invention also proposes a control device, which includes:

[0082] A memory;

[0083] A processor; and

[0084] A charging pile control program stored on the memory and executable on the processor, and when the processor executes the charging pile control program, it implements the charging pile control method as described in any one of the above.

[0085] It should be noted that since the control device of the present invention is based on the above charging pile control method, therefore, the embodiments of the control device of the present invention include all the technical solutions of all the embodiments of the above charging pile control method, and the achieved technical effects are also exactly the same, so they will not be elaborated here.

[0086] The present invention also provides a charging pile system, which includes the control device described above.

[0087] It should be noted that since the charging pile system of the present invention is based on the above control device, therefore, the embodiments of the charging pile system of the present invention include all the technical solutions of all the embodiments of the above control device, and the achieved technical effects are also exactly the same, which will not be elaborated here.

[0088] The above content is only an optional embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structural transformation made by using the description and drawings of the present invention under the inventive concept of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A charging pile control method, wherein the charging pile includes a charging gun, characterized in that: Applied to a control device, the control device at least includes a sampling and conditioning circuit, a CPU, a temperature rise slope generation circuit, a hardware comparison circuit, and a charging control unit, the sampling and conditioning circuit is used to convert the temperature signal of the charging gun into a voltage signal and then output it to the CPU, the temperature rise slope generation circuit, and the hardware comparison circuit respectively; The input end of the hardware comparison circuit is connected to the output end of the sampling and conditioning circuit. When the value connected to the input end of the hardware comparison circuit is greater than the value of the reference end, an over-temperature fault signal is output to the charging control unit; the temperature rise slope generation circuit is used to calculate the temperature rise slope and output it to the hardware comparison circuit, so that the charging control unit starts the over-temperature protection function when the temperature rise slope of the charging gun exceeds the set value; The charging pile control method comprises: Obtaining the temperature of the charging gun and calculating the temperature rise slope of the charging gun; When the temperature rise slope is greater than a preset slope, controlling the charging gun to be in a non-working state; After obtaining the temperature of the charging gun, the charging pile control method further includes: When the temperature of the charging gun is greater than a first preset temperature and reaches a first preset time, the output current of the charging gun is reduced to a preset current value or the charging gun is controlled to be in a non-working state; when the temperature of the charging gun is greater than a second preset temperature, the charging gun is controlled to be in a non-working state; When the temperature of the charging gun is greater than a first preset temperature, the step of reducing the output current of the charging gun to a preset current value or controlling the charging gun to be in a non-working state specifically includes: When the temperature of the charging gun is greater than a first preset temperature, starting timing to obtain a first duration; When the temperature of the charging gun is lower than the difference between the first preset temperature and the temperature hysteresis value, the timing is stopped and the first time length is reset to zero; When the temperature of the charging gun is greater than a second preset temperature, the charging gun is controlled to be in a non-working state, the timing is stopped, and the first duration is reset to zero; When the first time reaches a first preset time, the cooling system fails and cannot cool the charging gun or the charging line fails, the output current of the charging gun is reduced to a preset current value or the charging gun is controlled to be in a non-working state; When the temperature rise slope is greater than a preset slope, controlling the charging gun to be in a non-working state specifically includes: When the temperature rise slope is greater than a preset slope, starting timing to obtain a second duration; When the temperature of the charging gun is greater than a first preset temperature, controlling the charging gun to be in an abnormal state; When the temperature rise slope is less than the difference between the preset slope and the second hysteresis value, stop timing; When the second time period reaches a second preset time period, controlling the charging gun to be in an abnormal state; When the temperature of the charging gun is greater than a first preset temperature, the step of reducing the output current of the charging gun to a preset current value or controlling the charging gun to be in a non-working state specifically includes: When the temperature of the charging gun is greater than the first preset temperature, calculating the temperature rise slope of the charging gun in real time to obtain a first temperature rise slope of the charging gun; When the first temperature rise slope is greater than a preset slope, controlling the charging gun to be in a non-working state; Among them, the first preset temperature is a warning temperature point, and the second preset temperature is an emergency stop temperature point.

2. The charging pile control method according to claim 1, characterized in that: When the temperature of the charging gun is greater than a second preset temperature, controlling the charging gun to be in a non-working state includes: When the temperature of the charging gun is greater than a second preset temperature, an over-temperature fault signal is generated, and the charging gun is controlled to be in a non-working state according to the over-temperature fault signal.

3. The charging pile control method according to claim 1, characterized in that: The temperature rise slope of the charging gun is calculated using the following formula: ； In the formula, is the temperature rise slope of the charging gun; is the temperature detected at the first time point; is the temperature detected at the second time point; is the time interval between the first time point and the second time point.

4. A control device, characterized in that: The control device comprises: Memory; Processor; and A charging pile control program stored in a memory and executable on a processor, wherein the processor implements the charging pile control method according to any one of claims 1 to 3 when executing the charging pile control program.

5. A charging pile system, characterized in that: The charging pile system comprises the control device as claimed in claim 4.

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