A detection device and method applicable to AC charging of new energy vehicles

Abstract

The present application provides a detection device and method applicable to AC charging of new energy vehicles. The device includes: a first charging socket, a first charging gun, and a detection module, where: the first charging socket is used to connect to a second charging gun of an AC charging pile, the first charging gun is used to connect to a second charging socket of a vehicle, and the first charging socket is connected to the first charging gun; the detection module includes a sliding rheostat, the sliding rheostat is connected to the first charging gun, and the sliding rheostat is used to detect whether the effective range of the confirmation connection resistance set by the software of the vehicle meets the corresponding design requirements. The embodiments of the present application can achieve the detection function without affecting charging.

Description

Technical Field

[0001] This application relates to the technical field of new energy vehicle charging, and particularly relates to a detection device and method suitable for alternating current charging of new energy vehicles. Background Art

[0002] There are many brands of alternating current charging piles on the market. There are software and hardware differences between different brands or even different production years of the same brand of alternating current charging piles, which may lead to charging compatibility problems or other charging problems.

[0003] How to check the problems that occur during the charging process or detect whether the charging process meets the relevant design requirements has become an urgent problem to be solved currently. Summary of the Invention

[0004] In view of the above defects or deficiencies in the prior art, this application aims to provide a detection device and method suitable for alternating current charging of new energy vehicles.

[0005] According to the detection device suitable for alternating current charging of new energy vehicles provided in the first aspect, it includes: a first charging socket, a first charging gun, and a detection module, where:

[0006] The first charging socket is used to connect to the second charging gun of the alternating current charging pile, the first charging gun is used to connect to the second charging socket of the vehicle, and the first charging socket is connected to the first charging gun; the detection module includes a sliding rheostat, the sliding rheostat is connected to the first charging gun, and the sliding rheostat is used to detect whether the effective range of the confirmation connection resistance set by the software of the vehicle meets the corresponding design requirements.

[0007] In one embodiment, both the first charging socket and the first charging gun have alternating current power ports, and the alternating current power ports include the alternating current power port of the first phase line, the alternating current power port of the second phase line, the alternating current power port of the third phase line, and the neutral line port;

[0008] For a 380V alternating current charging pile, the alternating current power port of the first phase line of the first charging socket is connected to the alternating current power port of the first phase line of the first charging gun, the alternating current power port of the second phase line of the first charging socket is connected to the alternating current power port of the second phase line of the first charging gun, the alternating current power port of the third phase line of the first charging socket is connected to the alternating current power port of the third phase line of the first charging gun, and the neutral line port of the first charging socket is connected to the neutral line port of the first charging gun.

[0009] In one embodiment, for an AC charging pile with 220V, the AC power port of the first phase line of the first charging socket is connected to the AC power port of the first phase line of the first charging gun, and the neutral line port of the first charging socket is connected to the neutral line port of the first charging gun; the remaining AC power ports are all set to be floating.

[0010] In one embodiment, the platform port of the first charging socket is connected to the platform port of the first charging gun;

[0011] The charging connection confirmation port of the first charging socket is insulated and set to be floating. The charging connection confirmation port of the first charging gun is connected to one end of the sliding rheostat, and the other end of the sliding rheostat is connected to the platform port of the first charging gun.

[0012] In one embodiment, the detection module further includes a first resistor. One end of the first resistor is connected to the platform port of the first charging socket, and the other end of the first resistor is connected to the control pilot end of the first charging socket.

[0013] In one embodiment, the detection module further includes:

[0014] A PWM (Pulse Width Modulation) generator. The input end of the PWM generator is connected to the platform port of the first charging gun, and the output end of the PWM generator is connected to the control pilot end of the first charging gun. And the PWM generator is used to detect the output capacity of the AC charging pile through different duty cycles.

[0015] According to the detection method for AC charging applicable to new energy vehicles provided in the second aspect, the method is implemented based on the detection device provided in the first aspect. The method includes:

[0016] If the effective resistance range of the confirmation connection resistance set by the vehicle software is a to b, then when the effective resistance value of the sliding rheostat is adjusted to be less than a, it is judged whether the first design requirement is met. The first design requirement is that the vehicle cannot recognize the AC charging pile and report a connection fault;

[0017] When the effective resistance value of the sliding rheostat is adjusted to be within the range of a to b, it is judged whether the second design requirement is met. The second design requirement is that the vehicle recognizes the AC charging pile and enters the charging state;

[0018] If the first design requirement is met when the effective resistance value of the sliding rheostat is adjusted to be less than a, and the second design requirement is met when the effective resistance value of the sliding rheostat is adjusted to be within the range of a to b, then the effective resistance range a to b of the confirmation connection resistance set by the software of the vehicle meets the design requirements.

[0019] In one embodiment, different effective resistance values of the sliding rheostat correspond to different AC terminal current thresholds; the method further includes:

[0020] During the charging process, slide the sliding rheostat to different effective resistance values, obtain the current AC terminal current, and determine whether the current AC terminal current is less than the AC terminal current threshold corresponding to the current effective resistance value. If so, the AC terminal current is not exceeding the standard; otherwise, the AC terminal current exceeds the standard.

[0021] In one embodiment, on the basis that the detection device includes a PWM generator, the method further includes:

[0022] Control the PWM generator to output pulse signals with different duty cycles;

[0023] If the current duty cycle of the pulse signal currently output by the PWM generator has a corresponding first AC terminal current threshold and a second AC terminal current threshold, select the smaller value of the first AC terminal current threshold and the second AC terminal current threshold, and use the smaller value as the standard threshold for the current duty cycle; if the current duty cycle of the pulse signal currently output by the PWM generator only corresponds to the first AC terminal current threshold, use the first AC terminal current threshold as the standard threshold for the current duty cycle; if the current duty cycle of the pulse signal currently output by the PWM generator only corresponds to the second AC terminal current threshold, use the second AC terminal current threshold as the standard threshold for the current duty cycle; wherein, the second AC terminal current threshold is an AC terminal current threshold preset according to the duty cycle range to which the current duty cycle belongs, and the first AC terminal current threshold is an AC terminal current threshold calculated according to the current duty cycle;

[0024] Obtain the current AC terminal current output by the AC charging pile;

[0025] Determine whether the current AC terminal current is less than or equal to the standard threshold;

[0026] If so, the output capacity of the AC charging pile at the current duty cycle meets the standard;

[0027] Otherwise, the output capacity of the AC charging pile at the current duty cycle does not meet the standard.

[0028] In one embodiment, the method further includes:

[0029] Control the PWM generator to output pulse signals with different voltage amplitudes;

[0030] If the current voltage amplitude is lower than the preset voltage value, determine whether the vehicle has finished charging; if so, the preset voltage value meets the corresponding design requirements; otherwise, the preset voltage value does not meet the corresponding design requirements.

[0031] In summary, the present application proposes a detection device and method applicable to AC charging of new energy vehicles. The first charging socket is connected to the second charging gun of the AC charging pile, the first charging gun is connected to the second charging socket of the vehicle, and the first charging socket is connected to the first charging gun, so that the detection device serves as an intermediate medium and does not affect the charging of the vehicle by the AC charging pile. At the same time, since the detection device includes a detection module, and the detection module includes a sliding rheostat, the effective range of the confirmation connection resistance set by the software of the vehicle can be detected through the sliding rheostat to determine whether it meets the corresponding design requirements. That is, the present application can achieve the detection function without affecting charging. Description of the Drawings

[0032] Figure 1 It is a schematic connection diagram of a detection device applicable to AC charging of new energy vehicles provided by an embodiment of the present application, the AC charging pile, and the vehicle;

[0033] Figure 2 It is a schematic connection diagram of a detection device applicable to AC charging of new energy vehicles provided by another embodiment of the present application, the AC charging pile, and the vehicle.

[0034] Reference Signs:

[0035] L1 - AC power supply port of the first phase wire; L2 - AC power supply port of the second phase wire; L3 - AC power supply port of the third phase wire; N - neutral wire port; 51 - electric platform port; 61 - charging connection confirmation port; 71 - control pilot port; R1 - first resistor. Detailed Embodiments

[0036] The following further elaborates on the present application with reference to the drawings and embodiments. It can be understood that the specific embodiments described herein are only used to explain the related invention and are not intended to limit the invention. Additionally, it should be noted that for the sake of description, only parts related to the invention are shown in the drawings.

[0037] It should be noted that, without conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The following will detail the present application with reference to the drawings and embodiments.

[0038] In a first aspect, an embodiment of the present application provides a detection device applicable to AC charging of new energy vehicles. Refer to Figure 1 , the device includes a first charging socket, a first charging gun, and a detection module, where:

[0039] The first charging socket is used to connect to the second charging gun of the AC charging pile, the first charging gun is used to connect to the second charging socket of the vehicle, and the first charging socket is connected to the first charging gun; the detection module includes a sliding rheostat, the sliding rheostat is connected to the first charging gun, and the sliding rheostat is used to detect whether the effective range of the confirmation connection resistance set by the software of the vehicle meets the corresponding design requirements.

[0040] It can be understood that the detection device includes a charging socket and a charging gun, the AC charging pile also has a charging gun, and the vehicle also has a charging socket. For the sake of distinction, the charging socket in the detection device is called the first charging socket, the charging gun in the detection device is called the first charging gun, the charging gun in the AC charging pile is called the second charging gun, and the charging socket in the vehicle is called the second charging socket.

[0041] It can be understood that the second charging gun of the AC charging pile, the first charging socket in the detection device, the first charging gun in the detection device, and the second charging socket in the vehicle all have multiple ports. Specifically, each port of the first charging socket is connected to each port of the second charging gun of the AC charging pile in a one-to-one correspondence to realize the connection between the first charging socket and the second charging gun of the AC charging pile. Each port of the first charging gun is connected to each port of the second charging socket of the vehicle in a one-to-one correspondence to realize the connection between the first charging gun and the second charging socket of the vehicle. The first charging socket and the first charging gun can be connected through the AC power port, that is, the AC power port of the first charging socket is connected to the AC power port of the first charging gun. In this way, the AC power output by the AC charging pile can be transmitted to the vehicle through the AC power ports of the first charging socket and the first charging gun, thereby realizing charging. At this time, the detection device plays a mediating role and does not affect the charging of the vehicle.

[0042] Among them, Figure 1 the meaning of the arrow is the direction of the charging current.

[0043] In order to realize the detection function without affecting charging, a detection module is set. The detection module includes a sliding rheostat, and the sliding rheostat is connected to the first charging gun. By sliding the sliding rheostat to different positions and observing the different reactions of the vehicle, it can be known whether the effective range of the confirmation connection resistance set by the software of the vehicle meets the corresponding design requirements.

[0044] Among them, the names of the ports connected between the second charging gun of the AC charging pile and the first charging socket of the detection device are the same, and the names of the ports connected between the first charging gun of the detection device and the second charging socket of the vehicle are also the same. For example, the port a1 of the second charging gun of the DC charging pile is connected to the port a1 of the first charging socket in the detection device, and the port a1 of the first charging gun in the detection device is connected to the port a1 of the second charging socket of the vehicle. If the port a1 of the first charging socket of the detection device needs to be connected to the first charging gun, then the port a1 of the first charging socket of the detection device needs to be connected to the port a1 of the first charging gun.

[0045] It can be seen that in the embodiment of the present application, the first charging socket can be connected to the second charging gun of the AC charging pile, the first charging gun can be connected to the second charging socket of the vehicle, and the first charging socket is connected to the first charging gun, so that the detection device serves as an intermediate medium and does not affect the charging of the vehicle by the AC charging pile. At the same time, since a detection module is included in the detection device, and a sliding rheostat is included in the detection module, the effective range of the confirmation connection resistance set by the software of the vehicle can be detected through the sliding rheostat to determine whether it meets the corresponding design requirements. That is, the present application can achieve the above detection function without affecting charging.

[0046] In one embodiment, refer to Figure 2 , the AC power ports of the first charging socket and the first charging gun both include the AC power port L1 of the first phase line, the AC power port L2 of the second phase line, the AC power port L3 of the third phase line, and the neutral line port N;

[0047] For a 380V AC charging pile, the AC power port L1 of the first phase line of the first charging socket is connected to the AC power port L1 of the first phase line of the first charging gun, the AC power port L2 of the second phase line of the first charging socket is connected to the AC power port L2 of the second phase line of the first charging gun, the AC power port L3 of the third phase line of the first charging socket is connected to the AC power port L3 of the third phase line of the first charging gun, and the neutral line port N of the first charging socket is connected to the neutral line port N of the first charging gun.

[0048] That is to say, the AC power port L1 of the first phase line of the first charging socket and the first charging gun are connected to form an AC power line of the first phase line; the AC power port L2 of the second phase line of the first charging socket and the first charging gun are connected to form an AC power line of the second phase line; the AC power port L3 of the third phase line of the first charging socket and the first charging gun are connected to form an AC power line of the third phase line, and the neutral line port N of the first charging socket and the first charging gun are connected to form a neutral line.

[0049] The function of the neutral line in a three-phase AC circuit is to ensure that the phase voltages across the loads are nearly symmetric and that the voltage does not increase or decrease when the loads are unbalanced. For example, when one phase is broken, the voltages of the other two phases remain unchanged.

[0050] In one embodiment, for a 220V AC charging pile, the AC power supply port L1 of the first phase line of the first charging socket is connected to the AC power supply port L1 of the first phase line of the first charging gun, and the neutral line port N of the first charging socket is connected to the neutral line port N of the first charging gun; the remaining AC power supply ports are left floating.

[0051] That is to say, for a 220V AC charging pile, the AC power supply ports L1 of the first phase lines of the first charging socket and the first charging gun are connected to form an AC power supply line for the first phase line, which is equivalent to the live wire. The neutral line ports N of the first charging socket and the first charging gun are connected to form a neutral line, which is equivalent to the neutral wire. At this time, the AC power supply ports of the other phase lines are left unused.

[0052] Whether it is a 220V AC charging pile or a 380V AC charging pile, the second charging gun of the AC charging pile and the second charging socket of the vehicle also have the above-mentioned AC power supply ports for the first phase line, the second phase line, the third phase line, and the neutral line port. The connection relationships are as follows: the AC power supply port of the first phase line of the second charging gun of the AC charging pile is connected to the AC power supply port of the first phase line of the first charging socket, and the AC power supply port of the first phase line of the first charger is connected to the AC power supply port of the first phase line of the second charging socket of the vehicle. The AC power supply port of the second phase line of the second charging gun of the AC charging pile is connected to the AC power supply port of the second phase line of the first charging socket, and the AC power supply port of the second phase line of the first charger is connected to the AC power supply port of the second phase line of the second charging socket of the vehicle. The AC power supply port of the third phase line of the second charging gun of the AC charging pile is connected to the AC power supply port of the third phase line of the first charging socket, and the AC power supply port of the third phase line of the first charger is connected to the AC power supply port of the third phase line of the second charging socket of the vehicle. The neutral line port of the second charging gun of the AC charging pile is connected to the neutral line port of the first charging socket, and the neutral line port of the first charger is connected to the neutral line port of the second charging socket of the vehicle.

[0053] In one embodiment, referring to Figure 2 , the platform port 51 of the first charging socket is connected to the platform port 51 of the first charging gun;

[0054] The charging connection confirmation port 61 of the first charging socket is insulated and suspended. The charging connection confirmation port 61 of the first charging gun is connected to one end of the sliding rheostat, and the other end of the sliding rheostat is connected to the power platform port 51 of the first charging gun.

[0055] That is to say, both the first charging socket and the first charging gun have a power platform port 51. In fact, the second charging gun of the AC charging pile and the second charging socket of the vehicle also have a power platform interface. The power platform ports 51 of the second charging gun of the AC charging pile, the first charging socket, the first charging gun, and the second charging socket of the vehicle are connected in sequence to form a connection line.

[0056] Among them, the power platform port 51 is the PE (Protective Earthing) port, which can also be called the protective conductor port. The connection line formed by connecting the power platform ports 51 in sequence can be called the protective conductor line. The protective conductor line can realize charging protection functions, such as protective earthing, discharging, and is also used for connection confirmation during charging, etc.

[0057] That is to say, both the first charging socket and the first charging gun have a charging connection confirmation port 61. Since the detection of whether the effective range of the confirmation connection resistance set in the vehicle software meets the corresponding design requirements is realized through the sliding rheostat connected to the charging connection confirmation port 61 of the first charging gun, and the charging connection confirmation port 61 of the first charging socket is not needed, the charging connection confirmation port 61 of the first charging socket is insulated and suspended. Specifically, insulation treatment can be achieved by winding with tape.

[0058] In this embodiment, one end of the sliding rheostat is connected to the charging connection confirmation port 61 of the first charging gun, and the other end of the sliding rheostat is connected to the power platform port 51 of the first charging gun. By sliding the slider of the sliding rheostat, the effective resistance value connected between the charging connection confirmation port 61 and the power platform port 51 of the first charging gun is changed. This sliding rheostat can be used to simulate the confirmation connection resistance. Therefore, by changing the effective resistance value of the sliding rheostat to simulate confirmation connection resistances with different resistance values, the detection of whether the effective range of the confirmation connection resistance set in the vehicle software meets the corresponding design requirements can be realized.

[0059] For example, the standard resistance value of the confirmation connection resistance is 100Ω, the effective range of the confirmation connection resistance set in the vehicle software is 35Ω - 114Ω, and the design requirements are: 1. When the confirmation connection resistance is lower than 35Ω, the vehicle cannot recognize the AC charging pile and report a connection failure within a certain time. 2. When the confirmation connection resistance is equal to 35Ω, the vehicle can recognize the AC charging pile and enter the charging state.

[0060] To this end, slide the sliding rheostat until its effective resistance is 34 Ω. If the vehicle cannot recognize the AC charging pile at this time and reports a connection fault within a certain period of time, it meets the above design requirement 1. When the sliding rheostat is slid until its effective resistance value is 35 Ω, the vehicle can recognize the AC charging pile and enter the charging state, which meets the above design requirement 2.

[0061] It can be understood that each port of the second charging gun and the second charging socket also includes a charging connection confirmation port. The charging connection confirmation port of the second charging gun is connected to the charging connection confirmation port of the first charging socket, and the charging connection confirmation port of the first charging gun is connected to the charging connection confirmation port of the second charging socket.

[0062] Among them, the charging connection confirmation port is for the vehicle to confirm the connection with the AC charging pile.

[0063] In one embodiment, refer to Figure 2 , the detection module further includes a first resistor R1. One end of the first resistor R1 is connected to the platform port 51 of the first charging socket, and the other end of the first resistor R1 is connected to the control pilot end 71 of the first charging socket.

[0064] In the case where the above-mentioned first resistor is not set, the interaction process between the AC charging pile and the vehicle includes: A1. The control guide port of the second charging gun of the AC charging pile outputs a 12V voltage, which is actually the voltage difference between the control guide port of the second charging gun and the electric platform port. At this time, the electric platform port is equivalent to the negative pole. A2. After the second charging gun is connected to the vehicle through the detection device, due to the voltage division by the resistor at the vehicle end, the 12V voltage becomes 9V. A3. The user swipes the card. After swiping the card, the duty cycle of the PWM generator changes from 100% to a current duty cycle, for example, 50%. Therefore, the voltage output by the AC charging pile changes from 9V to 9V * the current duty cycle, for example, 9 * 50% = 4.5V. A4. When the vehicle is ready, a switch at the vehicle end will be closed. After this switch is closed, another resistor will be connected. Through the voltage division of this resistor, the output voltage changes from 9V * the current duty cycle to 6V * the current duty cycle. A5. The AC charging pile closes the AC power switch, thereby outputting 220V or 380V alternating current to start charging the vehicle. Here, the first resistor is set to replace the two resistors and the switch at the vehicle end, that is, the resistor that changes the 12V voltage to 9V in the above b and the resistor and switch that change 9V * the current duty cycle to 6V * the current duty cycle in the above d. In this way, the AC charging pile can directly detect the voltage jump from 12V to 6V, ensure that it directly jumps from 6V to 6V * the current duty cycle after the user swipes the card, thereby ensuring the output of the AC power supply, and avoiding the situation where the AC charging pile cannot output the AC power supply when the above two voltage divisions cannot be realized due to abnormalities at the vehicle end. That is, setting the first resistor can ensure the normal output of the AC power supply.

[0065] The second charging gun and the second charging socket also have control guide ports. The control guide port of the second charging gun is connected to the control guide port of the first charging socket, and the control guide port of the first charging gun is connected to the control guide port of the second charging socket. However, the control guide port of the first charging socket is not connected to the control guide port of the first charging gun. Specifically, the control guide port of the first charging socket is connected to one end of the first resistor, and the control guide port of the first charging gun is connected to the output end of the PWM generator.

[0066] In one embodiment, refer to Figure 2 , the detection module may further include:

[0067] A PWM generator, the input end of the PWM generator is connected to the electric platform port 51 of the first charging gun, the output end of the PWM generator is connected to the control guide end 71 of the first charging gun, and the PWM generator is used to detect the output capacity of the AC charging pile through different duty cycles.

[0068] It is understandable that the PWM generator is involved in explaining the function of the first resistor. The input end of the PWM generator is connected to the power platform port of the first charging gun, and the output end is connected to the control and guidance end of the first charging gun. The duty cycle of the PWM generator reflects the output capacity of the AC charging pile, so the output capacity of the AC charging pile can be detected through the PWM generator.

[0069] The specific detection method can refer to steps S21 - S24 in the second aspect. That is, S21: Control the PWM generator to output pulse signals with different duty cycles; S22: If the current duty cycle corresponding to the pulse signal currently output by the PWM generator has a corresponding first AC terminal current threshold and a second AC terminal current threshold, select the smaller value between the first AC terminal current threshold and the second AC terminal current threshold, and use the smaller value as the standard threshold for the current duty cycle; if the current duty cycle corresponding to the pulse signal currently output by the PWM generator only corresponds to the first AC terminal current threshold, use the first AC terminal current threshold as the standard threshold for the current duty cycle; if the current duty cycle corresponding to the pulse signal currently output by the PWM generator only corresponds to the second AC terminal current threshold, use the second AC terminal current threshold as the standard threshold for the current duty cycle; where the second AC terminal current threshold is the AC terminal current threshold set according to the duty cycle range to which the current duty cycle belongs, and the first AC terminal current threshold is the AC terminal current threshold calculated according to the current duty cycle; S23: Obtain the current AC terminal current output by the AC charging pile; S24: Determine whether the current AC terminal current is less than or equal to the standard threshold; if so, the output capacity of the AC charging pile at the current duty cycle meets the standard; otherwise, the output capacity of the AC charging pile at the current duty cycle does not meet the standard.

[0070] Among them, the first resistor can be an 880 - ohm resistor.

[0071] Among them, the first charging socket meets GBT 20234.2 - 2015, and the first charging gun meets GBT 20234.2 - 2015.

[0072] It is understandable that in the embodiment of the present application, a detection device is added between the AC charging pile and the vehicle. Through the different - gear adjustment of the sliding rheostat and the PWM generator in the detection device, multiple detection items are realized, solving the problem that the vehicle's AC charging system cannot be debugged and detected or is not convenient for debugging and detection. The detection device is applicable to the debugging and detection of the AC charging system of new - energy vehicles, is applicable to all national - standard AC charging vehicles, and can also be used for troubleshooting abnormal problems of market AC charging piles. It has strong versatility and a wide range of applications. Moreover, the operation is simple, greatly improving convenience.

[0073] Second aspect, an embodiment of the present application provides a detection method applicable to AC charging of new energy vehicles, and this method is implemented based on the detection device provided in the first aspect. This method includes the following steps S11 to S12:

[0074] S11. If the effective range of the confirmation connection resistance set by the vehicle's software is a to b, then when the effective resistance value of the sliding rheostat is adjusted to be less than a, it is determined whether the first design requirement is met. The first design requirement is that the vehicle cannot recognize the AC charging pile and report a connection failure;

[0075] Among them, a and b in the effective range of the confirmation connection resistance are set according to the standard resistance value of the confirmation connection resistance. A resistance value smaller than the standard resistance value is used as a, and a resistance value larger than the standard resistance value is used as b. That is, the resistance values a and b are determined near the standard resistance value. For example, in the corresponding part of the first aspect, a is 35Ω and b is 114Ω.

[0076] S12. When the effective resistance value of the sliding rheostat is adjusted to be within the range of a to b, it is determined whether the second design requirement is met. The second design requirement is that the vehicle recognizes the AC charging pile and enters the charging state;

[0077] S13. If the first design requirement is met when the effective resistance value of the sliding rheostat is adjusted to be less than a, and the second design requirement is met when the effective resistance value of the sliding rheostat is adjusted to be within the range of a to b, then the effective range of the confirmation connection resistance a to b set by the vehicle's software meets the design requirements.

[0078] It can be seen that the design requirements corresponding to the effective range of the confirmation connection resistance set by the vehicle's software include the above first design requirement and the second design requirement. Only when both design requirements are met can it be shown that the effective range of the confirmation connection resistance set by the vehicle's software meets the corresponding design requirements.

[0079] In one embodiment, in addition to detecting whether the effective range of the confirmed connection resistance set for the vehicle software meets the corresponding design requirements, the charging cable capacity can also be detected through a sliding rheostat. For a 220V AC charging pile, for example, when the confirmed connection resistance is 100Ω, the AC terminal current threshold between the AC power supply port L1 of the first phase line and the neutral line port N is 64A; when the confirmed connection resistance is 220Ω, the AC terminal current threshold between the AC power supply port L1 of the first phase line and the neutral line port N is 32A; when the confirmed connection resistance is 680Ω, the AC terminal current threshold between the AC power supply port L1 of the first phase line and the neutral line port N is 16A; when the confirmed connection resistance is 1500Ω, the AC terminal current threshold between the AC power supply port L1 of the first phase line and the neutral line port N is 10A. That is to say, different confirmed connection resistances correspond to different AC terminal current thresholds, and here the sliding rheostat is used to simulate different confirmed connection resistances.

[0080] Based on this, the method provided by the embodiment of the present application may further include:

[0081] During the charging process, slide the sliding rheostat to different effective resistance values, obtain the current AC terminal current, and determine whether the current AC terminal current is less than the AC terminal current threshold corresponding to the current effective resistance value. If so, the AC terminal current is not exceeded; otherwise, the AC terminal current is exceeded.

[0082] For example, slide the sliding rheostat to an effective resistance of 100Ω, and determine whether the AC terminal current between the AC power supply port L1 of the first phase line and the neutral line port N is less than or equal to 64A at this time. If so, it means that it is not exceeded; otherwise, the AC terminal current is exceeded at this time. Then, slide the sliding rheostat to an effective resistance of 220Ω, and determine whether the AC terminal current between the AC power supply port L1 of the first phase line and the neutral line port N is less than or equal to 32A at this time. If so, the AC terminal current is not exceeded at this time; otherwise, the AC terminal current is exceeded at this time. Then, slide the sliding rheostat to an effective resistance of 680Ω, and determine whether the AC terminal current between the AC power supply port L1 of the first phase line and the neutral line port N is less than or equal to 16A at this time. If so, the AC terminal current is not exceeded at this time; otherwise, the AC terminal current is exceeded at this time. Then, slide the sliding rheostat to an effective resistance of 1500Ω, and determine whether the AC terminal current between the AC power supply port L1 of the first phase line and the neutral line port N is less than or equal to 10A at this time. If so, the AC terminal current is not exceeded at this time; otherwise, the AC terminal current is exceeded at this time. If there are multiple exceedances during the above process, the charging is terminated.

[0083] It can be seen that through the above-mentioned rheostat, two detection items can be achieved. One is to detect whether the effective range of the confirmed connection resistance set by the vehicle software meets the corresponding design requirements; the other is to detect whether the current at the AC end exceeds the standard.

[0084] In one embodiment, on the premise that the detection device has a PWM generator, the method provided by the embodiment of the present application may further include the following steps S21 to S24:

[0085] S21. Control the PWM generator to output pulse signals with different duty cycles.

[0086] It can be understood that the PWM generator can output pulse signals with different duty cycles.

[0087] S22. If the current duty cycle corresponding to the pulse signal currently output by the PWM generator has a corresponding first AC end current threshold and a second AC end current threshold, select the smaller value of the first AC end current threshold and the second AC end current threshold, and use the smaller value as the standard threshold for the current duty cycle; if the current duty cycle corresponding to the pulse signal currently output by the PWM generator only corresponds to the first AC end current threshold, use the first AC end current threshold as the standard threshold for the current duty cycle; if the current duty cycle corresponding to the pulse signal currently output by the PWM generator only corresponds to the second AC end current threshold, use the second AC end current threshold as the standard threshold for the current duty cycle; wherein, the second AC end current threshold is the AC end current threshold set according to the duty cycle range to which the current duty cycle belongs, and the first AC end current threshold is the AC end current threshold calculated according to the current duty cycle.

[0088] Different second AC end current thresholds can be set in advance for different duty cycle ranges. For example, when the duty cycle D < 8%, charging is not allowed; when 8% ≤ D < 10%, the second AC end current threshold is 6A; when 10% < D ≤ 85%, there is no corresponding second AC end current threshold; when 85% < D ≤ 90%, the second AC end current threshold is 63A. The second AC end current threshold refers to a threshold set for the AC end current between the AC power supply port L1 of the first phase line and the neutral line port N, for a 220V AC charging pile.

[0089] Different first AC end current threshold calculation formulas can be set in advance for different duty cycle ranges. For example, for 10% ≤ D ≤ 85%, the first AC end current threshold calculation formula is D × 100 × 0.6; for 85% < D ≤ 90%, the first AC end current threshold calculation formula is (D × 100 - 64) × 2.5.

[0090] It can be seen that when 8% ≤ D < 10%, the standard threshold is 6A; when 10% < duty cycle D ≤ 85%, the standard threshold is D × 100 × 0.6; when 85% < D ≤ 90%, if (D × 100 - 64) × 2.5 is less than 63A, the standard threshold is (D × 100 - 64) × 2.5, and if (D × 100 - 64) × 2.5 is greater than or equal to 63A, the standard threshold is 63A.

[0091] S23. Obtain the current AC terminal current output by the AC charging pile.

[0092] S24. Determine whether the current AC terminal current is less than or equal to the standard threshold; if so, the output capacity of the AC charging pile at the current duty cycle meets the standard; otherwise, the output capacity of the AC charging pile at the current duty cycle does not meet the standard.

[0093] That is to say, if the obtained current AC terminal current is less than or equal to the standard threshold, it means that the output capacity of the AC charging pile at the current duty cycle meets the standard. If the obtained current AC terminal current is greater than the standard threshold, it means that the output capacity of the AC charging pile at the current duty cycle is excessive at this time.

[0094] For example, start by setting the duty cycle to 90%, gradually reduce the duty cycle, and when the duty cycle is reduced to 85% - 90%, determine whether the output capacity of the AC charging pile at the current duty cycle meets the standard. Then lower the duty cycle to 10% - 85% and determine whether the output capacity of the AC charging pile at the current duty cycle meets the standard. Then, lower the duty cycle to 8% ≤ D < 10% and determine whether the output capacity of the AC charging pile at the current duty cycle meets the standard. If it does not meet the standard multiple times, end the charging.

[0095] In one embodiment, the method provided by the embodiment of the present application may further include the following steps S31 - S32:

[0096] S31. Control the PWM generator to output pulse signals with different voltage amplitudes;

[0097] S32. If the current voltage amplitude is lower than the preset voltage value, determine whether the vehicle ends charging; if so, the preset voltage value meets the corresponding design requirements; otherwise, the preset voltage value does not meet the corresponding design requirements.

[0098] It can be understood that in addition to being able to output pulse signals with different duty cycles, the PWM generator can also have pulse signals with different voltage amplitudes.

[0099] For example, the voltage of the control and guidance port of the first charging gun is valid within the range of 4V to 12V. The preset voltage value is set to 3V. The design requirement is that when the output voltage is lower than 3V, the voltage is considered invalid and the charging needs to be terminated. Therefore, the control PWM outputs pulse signals with different voltage amplitudes. When the voltage amplitude is lower than 3V, it is judged whether the vehicle terminates charging. If the vehicle terminates charging, it indicates that the preset voltage value meets the design requirements; otherwise, it does not meet the design requirements. Therefore, it is possible to detect whether the preset voltage value meets the design requirements.

[0100] In this article, specific examples are used to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the method and its core idea of the present application. The above is only the preferred implementation manner of the present application. It should be noted that due to the limited nature of literal expression and the objectively infinite specific structures, for those of ordinary skill in the art in this technical field, without departing from the principle of the present invention, several improvements, refinements or changes can also be made, or the above technical features can be combined in an appropriate manner; these improvements, refinements, changes or combinations, or directly applying the concept and technical solution of the invention to other occasions without improvement, should all be regarded as the protection scope of the present application.

Claims

1. A detection method applicable to AC charging of new energy vehicles, characterized in that, The method is implemented based on a detection device, which includes: a first charging socket, a first charging gun, a detection module, and a PWM generator, where: The first charging socket is used to connect to the second charging gun of an AC charging pile, the first charging gun is used to connect to the second charging socket of a vehicle, and the first charging socket is connected to the first charging gun; the detection module includes a rheostat, the rheostat is connected to the first charging gun, and the rheostat is used to detect whether the effective range of the confirmation connection resistance set by the vehicle's software meets the corresponding design requirements; the input end of the PWM generator is connected to the power platform port of the first charging gun, the output end of the PWM generator is connected to the control pilot end of the first charging gun, and the PWM generator is used to detect the output capacity of the AC charging pile through different duty cycles; The method includes: If the effective range of the confirmation connection resistance set by the vehicle's software is a~b, then when the effective resistance value of the rheostat is adjusted to be less than a, it is judged whether the first design requirement is met, and the first design requirement is: the vehicle cannot recognize the AC charging pile and report a connection fault; When the effective resistance value of the rheostat is adjusted to be within the range of a~b, it is judged whether the second design requirement is met, and the second design requirement is: the vehicle recognizes the AC charging pile and enters the charging state; If the first design requirement is met when the effective resistance value of the rheostat is adjusted to be less than a, and the second design requirement is met when the effective resistance value of the rheostat is adjusted to be within the range of a~b, then the effective range of the confirmation connection resistance a~b set by the vehicle's software meets the design requirements; Control the PWM generator to output pulse signals with different duty cycles; If the current duty cycle of the pulse signal currently output by the PWM generator has a corresponding first AC terminal current threshold and a second AC terminal current threshold, then select the smaller value of the first AC terminal current threshold and the second AC terminal current threshold, and use the smaller value as the standard threshold of the current duty cycle; if the current duty cycle of the pulse signal currently output by the PWM generator only corresponds to the first AC terminal current threshold, then use the first AC terminal current threshold as the standard threshold of the current duty cycle; if the current duty cycle of the pulse signal currently output by the PWM generator only corresponds to the second AC terminal current threshold, then use the second AC terminal current threshold as the standard threshold of the current duty cycle; where, the second AC terminal current threshold is the AC terminal current threshold preset according to the duty cycle range to which the current duty cycle belongs, and the first AC terminal current threshold is the AC terminal current threshold calculated according to the current duty cycle; Obtain the current AC terminal current output by the AC charging pile; Judge whether the current AC terminal current is less than or equal to the standard threshold; If so, the output capacity of the AC charging pile at the current duty cycle meets the standard; Otherwise, the output capacity of the AC charging pile at the current duty cycle does not meet the standard.

2. The method according to claim 1, characterized in that, Different effective resistance values of the sliding rheostat correspond to different AC terminal current thresholds; the method further includes: During the charging process, slide the sliding rheostat to different effective resistance values, obtain the current AC terminal current, and determine whether the current AC terminal current is less than the AC terminal current threshold corresponding to the current effective resistance value. If so, the AC terminal current is not exceeded; otherwise, the AC terminal current is exceeded.

3. The method according to claim 1, characterized in that, It further includes: Controlling the PWM generator to output pulse signals with different voltage amplitudes; If the current voltage amplitude is lower than the preset voltage value, determine whether the vehicle has ended charging; If so, the preset voltage value meets the corresponding design requirements; otherwise, the preset voltage value does not meet the corresponding design requirements.

4. The method according to claim 1, characterized in that, Both the first charging socket and the first charging gun have AC power ports, and the AC power ports include the AC power port of the first phase line, the AC power port of the second phase line, the AC power port of the third phase line, and the neutral line port; For a 380V AC charging pile, the AC power port of the first phase line of the first charging socket is connected to the AC power port of the first phase line of the first charging gun, the AC power port of the second phase line of the first charging socket is connected to the AC power port of the second phase line of the first charging gun, the AC power port of the third phase line of the first charging socket is connected to the AC power port of the third phase line of the first charging gun, and the neutral line port of the first charging socket is connected to the neutral line port of the first charging gun.

5. The method according to claim 4, characterized in that, For a 220V AC charging pile, the AC power port of the first phase line of the first charging socket is connected to the AC power port of the first phase line of the first charging gun, and the neutral line port of the first charging socket is connected to the neutral line port of the first charging gun; the remaining AC power ports are all set to be suspended.

6. The method according to claim 1, characterized in that, The platform port of the first charging socket is connected to the platform port of the first charging gun; The charging connection confirmation port of the first charging socket is insulated and suspended, the charging connection confirmation port of the first charging gun is connected to one end of the sliding rheostat, and the other end of the sliding rheostat is connected to the platform port of the first charging gun.

7. The method according to claim 6, characterized in that, The detection module further includes a first resistor, one end of the first resistor is connected to the platform port of the first charging socket, and the other end of the first resistor is connected to the control pilot end of the first charging socket.

Images