Charging pile fault detection method, device and equipment and storage medium

Abstract

The application discloses a charging pile fault detection method and device, equipment and storage medium, and relates to the technical field of vehicles. The charging pile fault detection method comprises the following steps: acquiring a current charging duration and a current residual power when a vehicle charging mode is a fast charging mode; acquiring a charging pile output power, an extreme output power and a charging demand power when the current charging duration is greater than a charging duration threshold and the current residual power is in a preset power interval; and determining a target fault detection result according to the charging pile output power, the extreme output power and the charging demand power. Through the designed judgment and fault clearing scheme of AC / DC charging pile output derating fault, the active derating output working condition of charging piles of different power levels caused by factors such as over-temperature or internal fault during the charging process can be accurately identified, a user is sent a reminder, the user can respond and handle in time, and the charging experience of the user is improved.

Description

Technical Field

[0001] This application relates to the field of vehicle technology, and in particular to methods, devices, equipment and storage media for detecting charging pile faults. Background Technology

[0002] With the increasing popularity of electric vehicles, the demand for charging infrastructure is also growing. In this context, charging piles, as key devices connecting electric vehicles to the power grid, directly impact the user's charging experience through their performance and reliability. In particular, when a charging pile reduces its output power due to overheating or internal malfunctions, it not only prolongs charging time but may also adversely affect the health of the electric vehicle's battery, thus impacting the user experience. Therefore, addressing the low efficiency of existing charging piles in detecting derating output faults during charging has become an urgent problem to be solved. Summary of the Invention

[0003] The main objective of this application is to provide a method, device, equipment, and storage medium for detecting charging pile faults, aiming to solve the technical problem of low efficiency in detecting derating output faults in existing charging piles during the charging process.

[0004] To achieve the above objectives, this application proposes a charging pile fault detection method, which includes:

[0005] When the vehicle is in fast charging mode, obtain the current charging time and the current remaining battery level.

[0006] When the current charging time is greater than the charging time threshold and the current remaining power is within a preset power range, the charging pile output power, extreme output power, and charging demand power are obtained.

[0007] The target fault detection result is determined based on the output power of the charging pile, the extreme output power, and the charging demand power.

[0008] In one embodiment, the step of determining the target fault detection result based on the charging pile output power, the extreme output power, and the charging demand power includes:

[0009] A first power ratio is determined based on the output power of the charging pile and the charging demand power.

[0010] The second power ratio is determined based on the output power of the charging pile and the extreme output power.

[0011] When the first power ratio is less than the first fast charging fault threshold and the second power ratio is less than the second fast charging fault threshold, the target fault detection result is determined to be a charging power limited fault, and a charging power limited prompt message is generated.

[0012] In one embodiment, after the step of determining the target fault detection result based on the charging pile output power, the extreme output power, and the charging demand power, the method further includes:

[0013] When the target fault detection result is a charging power limited fault, the target output power, the target extreme power, and the target required power are obtained.

[0014] The first fault power ratio is determined based on the target output power and the target required power.

[0015] The second fault power ratio is determined based on the target output power and the target extreme power.

[0016] The fault clearing flag is determined based on the first fault power ratio and / or the second fault power ratio.

[0017] In one embodiment, the step of determining the fault clearing flag bit based on the first fault power ratio and / or the second fault power ratio,

[0018] When the first fault power ratio is greater than or equal to the first fast charging fault clearing threshold, the fault clearing flag is determined to be in the set state;

[0019] When the second fault power ratio is greater than or equal to the second fast charging fault clearing threshold, the fault clearing flag is set.

[0020] In one embodiment, the charging pile fault detection method further includes:

[0021] When the vehicle is in slow charging mode, obtain the current circuit resistance value;

[0022] The current signal duty cycle and the target signal duty cycle are determined based on the current loop resistance value.

[0023] The target fault detection result is determined based on the current signal duty cycle, the target signal duty cycle, and the slow charging fault coefficient.

[0024] In one embodiment, the step of determining the target fault detection result based on the current signal duty cycle, the target signal duty cycle, and the slow charging fault coefficient includes:

[0025] The fault duty cycle threshold is determined based on the target signal duty cycle and the slow charging fault coefficient;

[0026] The current signal duty cycle is compared with the fault duty cycle threshold to obtain the duty cycle comparison result;

[0027] When the duty cycle comparison result shows that the current signal duty cycle is less than the fault duty cycle threshold, the target fault detection result is determined to be a charging power limited fault, and a charging power limited prompt message is generated.

[0028] In one embodiment, after the step of determining the target fault detection result based on the current signal duty cycle, the target signal duty cycle, and the slow charging fault coefficient, the method further includes:

[0029] When the target fault detection result is a charging power limited fault, the fault circuit resistance value is obtained;

[0030] The corresponding fault duty cycle and target duration are determined based on the fault circuit resistance value.

[0031] When the fault duty cycle is greater than the fault clearing threshold and the target duration is greater than the preset duration threshold, the fault clearing flag is set.

[0032] Furthermore, to achieve the above objectives, this application also proposes a charging pile fault detection device, which includes:

[0033] The acquisition module is used to acquire the current charging time and the current remaining battery power when the vehicle is in fast charging mode.

[0034] The acquisition module is also used to acquire the charging pile output power, extreme output power and charging demand power when the current charging time is greater than the charging time threshold and the current remaining power is within a preset power range.

[0035] The detection module is used to determine the target fault detection result based on the output power of the charging pile, the extreme output power, and the charging demand power.

[0036] In addition, to achieve the above objectives, this application also proposes a charging pile fault detection device, the device comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the charging pile fault detection method described above.

[0037] In addition, to achieve the above objectives, this application also proposes a storage medium, which is a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the steps of the charging pile fault detection method described above.

[0038] In addition, to achieve the above objectives, this application also provides a computer program product, which includes a computer program that, when executed by a processor, implements the steps of the charging pile fault detection method described above.

[0039] This application obtains the current charging time and current remaining battery level when the vehicle is in fast charging mode; when the current charging time exceeds a charging time threshold and the current remaining battery level is within a preset battery level range, it obtains the charging pile output power, extreme output power, and charging demand power; and determines the target fault detection result based on the charging pile output power, the extreme output power, and the charging demand power. Through the designed AC / DC charging pile output derating fault judgment and fault clearing scheme, it can accurately identify the active derating output condition of charging piles of different power levels during charging due to factors such as overheating or internal faults, and send reminders to users, facilitating timely response and improving the user charging experience. Attached Figure Description

[0040] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0041] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0042] Figure 1 This is a flowchart illustrating an embodiment of the charging pile fault detection method of this application.

[0043] Figure 2 This is a flowchart illustrating Embodiment 2 of the charging pile fault detection method of this application.

[0044] Figure 3 This is a schematic diagram of the module structure of the charging pile fault detection device according to an embodiment of this application;

[0045] Figure 4 This is a schematic diagram of the equipment structure of the hardware operating environment involved in the charging pile fault detection method in this application embodiment.

[0046] The purpose, features, and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0047] It should be understood that the specific embodiments described herein are merely illustrative of the technical solutions of this application and are not intended to limit this application.

[0048] To better understand the technical solution of this application, a detailed description will be provided below in conjunction with the accompanying drawings and specific implementation methods.

[0049] The main solution of this application embodiment is: when the vehicle charging mode is fast charging mode, obtain the current charging time and the current remaining power; when the current charging time is greater than the charging time threshold and the current remaining power is within a preset power range, obtain the charging pile output power, the extreme output power and the charging demand power; determine the target fault detection result based on the charging pile output power, the extreme output power and the charging demand power.

[0050] With the increasing popularity of electric vehicles, the demand for charging infrastructure is also growing. In this context, charging piles, as key devices connecting electric vehicles to the power grid, directly impact the user's charging experience through their performance and reliability. In particular, when a charging pile reduces its output power due to overheating or internal malfunctions, it not only prolongs charging time but may also adversely affect the health of the electric vehicle's battery, thus impacting the user experience. Therefore, addressing the low efficiency of existing charging piles in detecting derating output faults during charging has become an urgent problem to be solved.

[0051] This application obtains the current charging time and current remaining battery level when the vehicle is in fast charging mode; when the current charging time exceeds a charging time threshold and the current remaining battery level is within a preset battery level range, it obtains the charging pile output power, extreme output power, and charging demand power; and determines the target fault detection result based on the charging pile output power, the extreme output power, and the charging demand power. Through the designed AC / DC charging pile output derating fault judgment and fault clearing scheme, it can accurately identify the active derating output condition of charging piles of different power levels during charging due to factors such as overheating or internal faults, and send reminders to users, facilitating timely response and improving the user charging experience.

[0052] It should be noted that the executing entity in this embodiment can be a computing service device with data processing, network communication, and program execution functions, such as a tablet computer, personal computer, or mobile phone, or a charging pile fault detection device capable of performing the above functions. The following description uses a charging pile fault detection device as the executing entity to illustrate this embodiment and the subsequent embodiments.

[0053] Based on this, this application provides a method for detecting charging pile faults, referring to... Figure 1 , Figure 1 This is a flowchart illustrating the first embodiment of the charging pile fault detection method of this application.

[0054] In this embodiment, the charging pile fault detection method includes steps S10 to S30:

[0055] Step S10: When the vehicle charging mode is fast charging mode, obtain the current charging time and the current remaining power.

[0056] It should be noted that in this embodiment, for DC fast charging, since the DC fast charging control guide circuit does not have a characteristic value indicating the output capacity of the charging pile, it is impossible to determine the derating output of the charging pile by identifying changes in the control guide circuit parameters, as is the case with AC slow charging. For example, in GB / T 27930-2015 "Communication Protocol between Off-board Conductive Charger and Battery Management System for Electric Vehicles", DC charging piles send output current and output voltage information during charging; however, there are many brands of DC charging piles on the market, and not all brands can accurately send output current and output voltage signals; therefore, for vehicles, it is not possible to simply determine whether the charging pile output is derating based on the received DC charging pile output current and output voltage signals.

[0057] It is understandable that fast charging mode refers to DC fast charging mode, current charging time refers to the length of time the vehicle has been in a charging state from the start of charging to the present moment, and current remaining power refers to the proportion of the battery's current stored electrical energy relative to the battery's total capacity during the charging process.

[0058] In practice, when the vehicle's charging mode is detected to be DC fast charging mode, in order to accurately identify the derating output fault of the charging pile in DC fast charging mode, the length of time the vehicle has been in the charging state from the start of charging to the current time and the ratio of the current stored electrical energy of the battery to the total battery capacity during the charging process are obtained, i.e., the current charging time and the current remaining power.

[0059] Step S20: When the current charging time is greater than the charging time threshold and the current remaining power is within the preset power range, obtain the charging pile output power, extreme output power and charging demand power.

[0060] It is understandable that the charging time threshold refers to the critical value of charging time used to determine whether the fault identification conditions are met, the preset power range refers to the remaining power range for the fast charging pile output derating fault diagnosis, the charging pile output power refers to the actual output power of the charging pile, the extreme output power refers to the maximum actual output power of the charging pile in the first 5 seconds (which can be calibrated), and the charging demand power refers to the power required by the vehicle for charging.

[0061] In practice, when the current charging time is greater than the charging time threshold used to determine whether the fault identification conditions are met, and the current remaining power is within the pre-set remaining power range for diagnosing fast charging pile output derating faults, it indicates that fast charging pile output derating fault diagnosis can be performed. In this way, the actual output power of the charging pile, the actual maximum output power of the charging pile in the first 5 seconds (which can be calibrated), and the power required for vehicle charging can be obtained, namely, the output power of the charging pile, the extreme output power, and the charging demand power.

[0062] It should be noted that during fast charging, the power supplied to the vehicle by the charging pile is used partly for charging the power battery and partly for the consumption of high-voltage accessories (such as air conditioning). Therefore, the vehicle (which may be the vehicle control unit, VCU) can accurately represent the output power of the charging pile by calculating the sum of the battery charging power and the power consumed by the high-voltage accessories.

[0063] Step S30: Determine the target fault detection result based on the output power of the charging pile, the extreme output power, and the charging demand power.

[0064] It is understandable that the target fault detection results include both charging power limited fault results and charging power normal results.

[0065] In practice, the derating output fault of the fast charging pile is diagnosed based on the actual output power of the charging pile, the maximum actual output power of the charging pile in the first 5 seconds (which can be calibrated), and the power required for vehicle charging, so as to obtain the target fault detection result.

[0066] In one feasible implementation, step S30 may include steps A31 to A33:

[0067] Step A31: Determine the first power ratio based on the output power of the charging pile and the charging demand power;

[0068] It should be noted that the first power ratio refers to the ratio of the charging pile's output power to the charging demand power.

[0069] In practice, the ratio of the actual output power of the charging pile to the power required for vehicle charging is calculated to obtain the first power ratio.

[0070] Step A32: Determine the second power ratio based on the output power of the charging pile and the extreme output power;

[0071] It is understandable that the second power ratio refers to the ratio of the charging pile's output power to its maximum output power.

[0072] In practice, the ratio of the actual output power of the charging pile to the maximum actual output power of the charging pile within the first 5 seconds (which can be calibrated) is calculated to obtain the ratio of the charging pile's output power to the extreme output power, which is the second power ratio.

[0073] Step A33: When the first power ratio is less than the first fast charging fault threshold and the second power ratio is less than the second fast charging fault threshold, the target fault detection result is determined to be a charging power limited fault, and a charging power limited prompt message is generated.

[0074] It is understandable that the first fast charging fault threshold refers to the critical value of the ratio of the charging pile's output power to the extreme output power used to determine whether there is a charging power limitation fault, the second fast charging fault threshold refers to the critical value of the ratio of the charging pile's output power to the extreme output power used to determine whether there is a charging power limitation fault, and the charging power limitation prompt information refers to the information that prompts the user that the charging device has a derating output fault.

[0075] In specific implementation, the first power ratio is compared with the critical value of the ratio of the charging pile output power to the extreme output power used to determine whether there is a charging power limitation fault, and the second power ratio is compared with the critical value of the ratio of the charging pile output power to the extreme output power used to determine whether there is a charging power limitation fault. When the ratio of the charging pile output power to the extreme output power is less than the critical value of the ratio of the charging pile output power to the extreme output power used to determine whether there is a charging power limitation fault, the target fault detection result is determined to be a charging power limitation fault, and information prompting the user that the charging equipment has a derating output fault is generated.

[0076] It should be noted that the fault diagnosis strategy for abnormal derating output of fast charging piles in this embodiment is as follows: 1. Since the fast charging pile outputs slowly when it starts, i.e., there is a slow start strategy, after the vehicle enters the fast charging state, wait for 2 minutes (calibrable) before performing fault diagnosis for derating output of the fast charging pile; 2. Since the vehicle will actively reduce the charging current demand when the SOC is high; to avoid misjudging the derating output of the charging pile at high SOC, it is stipulated that fault diagnosis for derating output of the fast charging pile will only be performed in the range of 0% (calibrable) ≤ SOC ≤ 90% (calibrable); 3. During fast charging, part of the power supplied by the charging pile to the vehicle is used for charging the power battery, and the other part is used for the consumption of high voltage accessories (such as air conditioning consumption); therefore, the vehicle (which can be the vehicle controller V) CU) can accurately represent the output power of the charging pile by calculating the sum of the battery charging power and the high-voltage accessory power consumption; 4. During fast charging, the vehicle determines that [actual output power of the charging pile (battery charging power + high-voltage accessory power consumption)] / (vehicle charging demand power) < 60% (calibrable); 5. During fast charging, the vehicle determines that [current actual output power of the charging pile (battery charging power + high-voltage accessory power consumption)] / [maximum actual output power of the charging pile in the first 5 seconds (calibrable) (battery charging power + high-voltage accessory power consumption)] < 60% (calibrable); Under the premise of satisfying conditions 1 to 3, if conditions 4 and 5 are satisfied and last for 1 minute (TBD), the vehicle considers the output power of the charging pile to be limited; a flag is given to indicate "charging power limited".

[0077] In one possible implementation, steps S30 may be followed by steps B31 to B34:

[0078] Step B31: When the target fault detection result is a charging power limited fault, obtain the target output power, the target extreme power, and the target required power.

[0079] It is understandable that the target output power refers to the actual output power of the charging pile when the charging power is limited, the target extreme power refers to the maximum actual output power of the charging pile within the first 5 seconds (which can be calibrated) when the charging power is limited, and the target demand power refers to the charging power required by the vehicle when the charging power is limited.

[0080] In specific implementation, when it is determined that the output power of the charging pile is limited, in order to clear the fault diagnosis of the charging pile derating output, the actual output power of the charging pile when the charging power is limited, the actual maximum output power of the charging pile in the first 5 seconds (which can be calibrated), and the charging power required by the vehicle are obtained, namely the target output power, the target extreme power, and the target required power.

[0081] Step B32: Determine the first fault power ratio based on the target output power and the target required power;

[0082] It is understandable that the first fault power ratio refers to the ratio of the target output power to the target demand power.

[0083] In practice, the ratio of the actual output power of the charging pile during a charging power limitation fault to the charging power required by the vehicle is calculated to obtain the ratio of the target output power to the target required power, which is the first fault power ratio.

[0084] Step B33: Determine the second fault power ratio based on the target output power and the target extreme power;

[0085] It is understandable that the second fault power ratio refers to the ratio of the target output power to the target extreme power.

[0086] In practice, the ratio of the actual output power of the charging pile during the charging power limitation fault to the actual maximum output power of the charging pile in the first 5 seconds (which can be calibrated) is calculated to obtain the ratio of the target output power to the target extreme power, which is the second fault power ratio.

[0087] Step B34: Determine the fault clearing flag bit based on the first fault power ratio and / or the second fault power ratio.

[0088] In practice, the fault clearing condition is determined based on the ratio of the target output power to the target demand power and / or the ratio of the target output power to the target extreme power, and then the fault clearing flag is determined.

[0089] In one feasible implementation, step B34 may include steps C341-C342:

[0090] Step C341: When the first fault power ratio is greater than or equal to the first fast charging fault clearing threshold, determine that the fault clearing flag is in the set state;

[0091] It is understandable that the first fast charging fault clearing threshold refers to the critical value of the ratio of target output power to target demand power used to determine whether the fault clearing conditions are met.

[0092] In practice, when the ratio of the target output power to the target demand power is greater than or equal to the critical value used to determine whether the fault clearing condition is met, it indicates that the fault clearing condition is met, that is, the fault clearing flag is in the set state.

[0093] Step C342: When the second fault power ratio is greater than or equal to the second fast charging fault clearing threshold, determine that the fault clearing flag is in the set state.

[0094] It is understandable that the second fast charging fault clearing threshold refers to the critical value of the ratio of the target output power to the target extreme power used to determine whether the fault clearing conditions are met.

[0095] In practice, if the ratio of the target output power to the target extreme power is greater than or equal to the critical value used to determine whether the fault clearing condition is met, it indicates that the fault clearing condition is met, that is, the fault clearing flag is in the set state.

[0096] It should be noted that during fast charging, when a derating output fault of the charging equipment is diagnosed, a reminder will be sent to the user, displayed on the vehicle's instrument panel or mobile app. When the fault clearing conditions are met, the vehicle will clear the charging pile derating output fault diagnosis and remove the reminder sent to the user. The charging equipment derating output fault clearing conditions are as follows: 1. In fast charging mode, the vehicle (which can be the vehicle controller VCU) determines that [actual output power of the charging pile (battery charging power + high-voltage accessory power consumption)] / [vehicle charging demand power] ≥ 80% (calibrable), and this condition persists for 20 seconds (calibrable); 2. In fast charging mode, the vehicle (which can be the vehicle controller VCU) determines that [actual output power of the charging pile (battery charging power + high-voltage accessory power consumption)] / [actual maximum output power of the charging pile (battery charging power + high-voltage accessory power consumption) within the first 5 seconds (calibrable)] ≥ 120% (calibrable), and this condition persists for 20 seconds (calibrable); 3. DC fast charging ends, such as after swiping a card. Meeting any of the above conditions will clear the charging equipment derating output fault flag.

[0097] This embodiment obtains the current charging time and current remaining battery level when the vehicle is in fast charging mode. When the current charging time exceeds a charging time threshold and the current remaining battery level is within a preset battery level range, it obtains the charging pile output power, extreme output power, and charging demand power. The target fault detection result is determined based on the charging pile output power, the extreme output power, and the charging demand power. Through the designed AC / DC charging pile output derating fault judgment and fault clearing scheme, it can accurately identify the active derating output condition of charging piles of different power levels during charging due to factors such as overheating or internal faults, and send reminders to users, facilitating timely response and improving the user charging experience.

[0098] Based on the first embodiment of this application, in the second embodiment of this application, the content that is the same as or similar to that in the first embodiment described above can be referred to the above description, and will not be repeated hereafter. Based on this, please refer to... Figure 2 The charging pile fault detection method further includes steps S11 to S13:

[0099] Step S11: When the vehicle charging mode is slow charging mode, obtain the current circuit resistance value;

[0100] It should be noted that in this embodiment, the AC charging equipment can only communicate with the vehicle through the control guidance circuit to indicate the power of the charging pile. For example, when the charging equipment is a 7kW single-phase AC charging pile, the corresponding R4 and RC resistance values ​​are 3.3kΩ and 220Ω, respectively, and the corresponding CP PWM signal duty cycle is 53%. When the AC charging equipment experiences derating due to factors such as overheating or internal faults, it will actively reduce the duty cycle of the output CP PWM signal. Therefore, the vehicle can diagnose whether the charging equipment is exhibiting derating output by recognizing the control guidance circuit signals.

[0101] It is understandable that the current loop resistance value refers to the resistance value of the current CC loop (control guide circuit).

[0102] In practice, when the vehicle's charging mode is detected to be slow charging mode, in order to accurately identify the derating output fault of the charging pile during slow charging mode, the resistance value of the current CC circuit, i.e., the current circuit resistance value, is obtained.

[0103] Step S12: Determine the corresponding current signal duty cycle and target signal duty cycle based on the current loop resistance value;

[0104] It is understandable that the current signal duty cycle refers to the current duty cycle of the CP PWM signal, while the target signal duty cycle refers to the standard CP PWM signal duty cycle corresponding to the CC loop resistance value. In electric vehicle charging systems, the CP PWM signal duty cycle is a crucial parameter used to control communication and status monitoring during the charging process. CP (ControlPilot) is part of the charging control pilot circuit, using PWM (Pulse Width Modulation) signals to transmit charging status and control information.

[0105] In practice, the duty cycle of the current CP PWM signal and the duty cycle of the standard CP PWM signal are determined based on the obtained resistance value of the current CC circuit, i.e., the duty cycle of the current signal and the duty cycle of the target signal.

[0106] Step S13: Determine the target fault detection result based on the current signal duty cycle, the target signal duty cycle, and the slow charging fault coefficient.

[0107] It is understandable that the slow charging fault coefficient refers to the duty cycle coefficient used to determine whether there is a derating output fault in slow charging mode.

[0108] In practice, the duty cycle of the current CP PWM signal and the duty cycle of the standard CP PWM signal are determined based on the resistance value of the current CC circuit. Then, the duty cycle coefficient used to determine whether there is a derating output fault in the slow charging mode is combined to diagnose the fault of abnormal derating output of the slow charging pile and determine the target fault detection result.

[0109] In one feasible implementation, step S13 may include steps A131 to A133:

[0110] Step A131: Determine the fault duty cycle threshold based on the target signal duty cycle and the slow charging fault coefficient;

[0111] It is understandable that the fault duty cycle threshold refers to the critical duty cycle value used to determine whether there is a derating output fault.

[0112] In practice, the duty cycle threshold for determining whether there is a derating output fault is determined by multiplying the duty cycle of the standard CP PWM signal corresponding to the resistance value of the current CC circuit with the duty cycle coefficient used to determine whether there is a derating output fault in the slow charging mode.

[0113] Step A132: Compare the current signal duty cycle with the fault duty cycle threshold to obtain the duty cycle comparison result;

[0114] It is understandable that the duty cycle comparison result refers to the comparison between the current signal duty cycle and the fault duty cycle threshold.

[0115] In practice, the duty cycle of the current CP PWM signal corresponding to the current resistance value of the current CC circuit is compared with the duty cycle threshold used to determine whether there is a derating output fault, so as to determine the comparison result between the current signal duty cycle and the fault duty cycle threshold, i.e., the duty cycle comparison result.

[0116] Step A133: When the duty cycle comparison result shows that the current signal duty cycle is less than the fault duty cycle threshold, the target fault detection result is determined to be a charging power limited fault, and a charging power limited prompt message is generated.

[0117] It is understandable that the charging power limitation warning message refers to a message indicating that the charging device has a derating output fault.

[0118] In practice, when the duty cycle comparison result is that the duty cycle of the current CP PWM signal corresponding to the resistance value of the current CC circuit is less than the duty cycle threshold used to determine whether there is a derating output fault, it indicates that the vehicle is determined to be a slow charging pile derating fault, the target fault detection result is determined to be a charging power limited fault, and information is generated to prompt the user that the charging equipment has a derating output fault.

[0119] It should be noted that the fault diagnosis strategy for abnormal derating output of slow charging piles in this embodiment is as follows: 1. When the charging gun is fully connected to the vehicle, the vehicle identifies the power level of the charging equipment by detecting the resistance value of the CC circuit. When the detected resistance value is 1.5 kΩ and the CP PWM signal duty cycle is 17%, the maximum output current of the charging equipment is 10A, and the power level is 2.2kW; when the detected resistance value is 680 Ω and the CP PWM signal duty cycle is 27%, the maximum output current of the charging equipment is 16A, and the power level is 3.3kW (single-phase pile) or 11kW (three-phase pile); when the detected resistance value is 220Ω and the CP PWM signal duty cycle is 53%, the maximum output current of the charging equipment is 32A, and the power level is 7kW; when the detected resistance value is 100Ω and the CP PWM signal duty cycle is 90%, the maximum output current of the charging equipment is 63A, and the power level is 42kW (three-phase pile); 2. During AC charging, if the vehicle detects a resistance value of 1.5 kΩ and the CP PWM signal duty cycle is 17%, the maximum output current of the charging equipment is 10A, and the power level is 2.2kW (three-phase pile). 2.1 If the vehicle detects a resistance value of 680Ω and the CP PWM signal duty cycle decreases by more than 20% for 100 seconds (calibrable), and the CP PWM signal duty cycle is less than (17%*0.8), the vehicle (which can be the vehicle controller VCU) determines it to be a slow charging station with derating and displays a flag indicating "limited charging power"; 2.2 If the vehicle detects a resistance value of 220Ω and the CP PWM signal duty cycle decreases by more than 20% for 100 seconds (calibrable), and the CP PWM signal duty cycle is less than (53%*0.8), the vehicle determines it to be a slow charging station with derating and displays a flag indicating "limited charging power"; 2.3 If the vehicle detects a resistance value of 100Ω and the CP PWM signal duty cycle decreases by more than 20% for 100 seconds (calibrable), the vehicle (which can be the vehicle controller VCU) determines it to be a slow charging station with derating and displays a flag indicating "limited charging power"; If the PWM signal duty cycle decreases by more than 20% and lasts for 100 seconds (which can be calibrated), and the CP PWM signal duty cycle is less than (90% * 0.8), the vehicle is identified as being charged by a slow charging station with reduced capacity, and a flag indicating "limited charging power" is displayed.

[0120] In one possible implementation, steps S13 may be followed by steps B131 to B133:

[0121] Step B131: When the target fault detection result is a charging power limited fault, obtain the fault circuit resistance value;

[0122] It is understandable that the fault circuit resistance value refers to the resistance value of the CC circuit when the slow charging pile experiences a derating fault.

[0123] In practice, when it is determined that there is a derating fault in the slow charging pile, in order to clear the diagnosis of the derating output fault of the charging pile, the resistance value of the CC circuit is obtained when the slow charging pile has a derating fault.

[0124] Step B132: Determine the corresponding fault duty cycle and target duration based on the fault circuit resistance value;

[0125] It is understood that the fault duty cycle refers to the duty cycle of the CP PWM signal when the slow charging pile experiences a derating fault, and the target duration refers to the duration of the fault duty cycle. The target duration can be set according to specific circumstances, and this embodiment does not limit it.

[0126] In practice, the duty cycle of the corresponding CP PWM signal is determined based on the resistance value of the CC circuit when the slow charging pile experiences a derating fault, and the duration of the fault duty cycle is collected to obtain the fault duty cycle and the target duration.

[0127] Step B133: When the fault duty cycle is greater than the fault clearing threshold and the target duration is greater than the preset duration threshold, determine that the fault clearing flag is in the set state.

[0128] It is understandable that the fault clearing threshold refers to the duty cycle threshold used to determine whether the slow charging pile derating fault is met, and the preset duration threshold refers to the duration threshold used to determine whether the slow charging pile derating fault is met.

[0129] In specific implementation, when a slow charging pile derating fault occurs, if the duty cycle of the CP PWM signal is greater than the duty cycle threshold used to determine whether the slow charging pile derating fault is met, and the duration of the fault duty cycle is greater than the duration threshold used to determine whether the slow charging pile derating fault is met, it indicates that the fault clearing condition is met, and thus the fault clearing flag is set.

[0130] It should be noted that in this embodiment, when a derating output fault of the charging equipment is diagnosed during slow charging, a reminder will be sent to the user, displayed on the vehicle's instrument panel or mobile app; when the fault clearing conditions are met, the vehicle clears the charging pile derating output fault diagnosis and removes the reminder sent to the user. The charging equipment derating output fault clearing conditions are as follows: 1. In AC slow charging mode, if the vehicle detects a resistance value of 1.5 kΩ and a derating output fault of the charging equipment has been diagnosed, and the CP PWM duty cycle is detected to be ≥ (17%*0.85) for 10 seconds (calibrable), then the vehicle (which can be the vehicle controller VCU) determines that the slow charging pile derating fault has been recovered and clears the fault flag; 2. In AC slow charging mode, if the vehicle detects a resistance value of 680 Ω and a derating output fault of the charging equipment has been diagnosed, and the CP PWM duty cycle is detected to be ≥ (17%*0.85) for 10 seconds (calibrable), then the vehicle (which can be the vehicle controller VCU) determines that the slow charging pile derating fault has been recovered and clears the fault flag; 1. If the PWM duty cycle is ≥ (27% * 0.85) and lasts for 10 seconds (calibrable), the vehicle (which can be the vehicle controller VCU) determines that the slow charging pile derating fault has been resolved and clears the fault flag. 2. In AC slow charging mode, if the vehicle detects a resistance value of 220Ω and a derating output fault has been diagnosed in the charging equipment, and the CPPWM duty cycle is ≥ (53% * 0.85) and lasts for 10 seconds (calibrable), the vehicle (which can be the vehicle controller VCU) determines that the slow charging pile derating fault has been resolved and clears the fault flag. 3. In AC slow charging mode, if the vehicle detects a resistance value of 100Ω and a derating output fault has been diagnosed in the charging equipment, and the CPPWM duty cycle is ≥ (53% * 0.85) and lasts for 10 seconds (calibrable), the vehicle (which can be the vehicle controller VCU) determines that the slow charging pile derating fault has been resolved and clears the fault flag. If the PWM duty cycle is ≥ (90% * 0.85) and lasts for 10 seconds (calibrable), the vehicle (which can be the vehicle controller VCU) is determined to have recovered from the slow charging pile derating fault and the fault flag is cleared; 5. AC slow charging ends, such as swiping a card to end slow charging, unplugging the charging gun to end slow charging, etc.; if any of the above conditions are met, the derating output fault flag of the charging equipment can be cleared.

[0131] This embodiment obtains the current circuit resistance value when the vehicle is in slow charging mode; determines the corresponding current signal duty cycle and target signal duty cycle based on the current circuit resistance value; and determines the target fault detection result based on the current signal duty cycle, the target signal duty cycle, and the slow charging fault coefficient. By accurately identifying the derating output of the charging pile during charging and promptly sending reminders to the user, the user understands the reason for the slow charging and can take timely action.

[0132] It should be noted that the above examples are only for understanding this application and do not constitute a limitation on the charging pile fault detection method of this application. Any simple modifications based on this technical concept are within the protection scope of this application.

[0133] This application also provides a charging pile fault detection device, please refer to... Figure 3 The charging pile fault detection device includes:

[0134] The acquisition module 10 is used to acquire the current charging time and the current remaining power when the vehicle charging mode is fast charging mode;

[0135] The acquisition module 10 is further configured to acquire the charging pile output power, extreme output power, and charging demand power when the current charging duration is greater than the charging duration threshold and the current remaining power is within a preset power range.

[0136] The detection module 20 is used to determine the target fault detection result based on the output power of the charging pile, the extreme output power, and the charging demand power.

[0137] Optionally, the detection module 20 is further configured to:

[0138] A first power ratio is determined based on the output power of the charging pile and the charging demand power.

[0139] The second power ratio is determined based on the output power of the charging pile and the extreme output power.

[0140] When the first power ratio is less than the first fast charging fault threshold and the second power ratio is less than the second fast charging fault threshold, the target fault detection result is determined to be a charging power limited fault, and a charging power limited prompt message is generated.

[0141] Optionally, the detection module 20 is further configured to:

[0142] When the target fault detection result is a charging power limited fault, the target output power, the target extreme power, and the target required power are obtained.

[0143] The first fault power ratio is determined based on the target output power and the target required power.

[0144] The second fault power ratio is determined based on the target output power and the target extreme power.

[0145] The fault clearing flag is determined based on the first fault power ratio and / or the second fault power ratio.

[0146] Optionally, the detection module 20 is further configured to:

[0147] When the first fault power ratio is greater than or equal to the first fast charging fault clearing threshold, the fault clearing flag is determined to be in the set state;

[0148] When the second fault power ratio is greater than or equal to the second fast charging fault clearing threshold, the fault clearing flag is set.

[0149] Optionally, the detection module 20 is further configured to:

[0150] When the vehicle is in slow charging mode, obtain the current circuit resistance value;

[0151] The current signal duty cycle and the target signal duty cycle are determined based on the current loop resistance value.

[0152] The target fault detection result is determined based on the current signal duty cycle, the target signal duty cycle, and the slow charging fault coefficient.

[0153] Optionally, the detection module 20 is further configured to:

[0154] The fault duty cycle threshold is determined based on the target signal duty cycle and the slow charging fault coefficient;

[0155] The current signal duty cycle is compared with the fault duty cycle threshold to obtain the duty cycle comparison result;

[0156] When the duty cycle comparison result shows that the current signal duty cycle is less than the fault duty cycle threshold, the target fault detection result is determined to be a charging power limited fault, and a charging power limited prompt message is generated.

[0157] Optionally, the detection module 20 is further configured to:

[0158] When the target fault detection result is a charging power limited fault, the fault circuit resistance value is obtained;

[0159] The corresponding fault duty cycle and target duration are determined based on the fault circuit resistance value.

[0160] When the fault duty cycle is greater than the fault clearing threshold and the target duration is greater than the preset duration threshold, the fault clearing flag is set.

[0161] The charging pile fault detection device provided in this application, employing the charging pile fault detection method in the above embodiments, can solve the technical problem of low efficiency in detecting derating output faults in existing charging piles during charging. Compared with the prior art, the beneficial effects of the charging pile fault detection device provided in this application are the same as those of the charging pile fault detection method provided in the above embodiments, and other technical features in the charging pile fault detection device are the same as those disclosed in the methods of the above embodiments, and will not be repeated here.

[0162] This application provides a charging pile fault detection device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor to enable the at least one processor to perform the charging pile fault detection method in the above embodiment 1.

[0163] The following is for reference. Figure 4 The diagram illustrates a structural schematic suitable for implementing the charging pile fault detection device in the embodiments of this application. The charging pile fault detection device in the embodiments of this application may include, but is not limited to, mobile terminals such as mobile phones, laptops, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Description), PMPs (Portable Media Players), vehicle terminals (e.g., vehicle navigation terminals), and fixed terminals such as digital TVs and desktop computers. Figure 4 The charging pile fault detection device shown is merely an example and should not impose any limitations on the functionality and scope of use of the embodiments of this application.

[0164] like Figure 4 As shown, the charging pile fault detection device may include a processing unit 1001 (e.g., a central processing unit, a graphics processing unit, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM) 1002 or a program loaded from a storage device 1003 into a random access memory (RAM) 1004. The RAM 1004 also stores various programs and data required for the operation of the charging pile fault detection device. The processing unit 1001, ROM 1002, and RAM 1004 are interconnected via a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Typically, the following systems can be connected to the I / O interface 1006: input devices 1007 including, for example, a touch screen, touchpad, keyboard, mouse, image sensor, microphone, accelerometer, gyroscope, etc.; output devices 1008 including, for example, a liquid crystal display (LCD), speaker, vibrator, etc.; storage devices 1003 including, for example, magnetic tape, hard disk, etc.; and communication devices 1009. The communication device 1009 allows the charging pile fault detection equipment to communicate wirelessly or wiredly with other devices to exchange data. Although the figure shows charging pile fault detection equipment with various systems, it should be understood that implementation or possession of all the systems shown is not required. More or fewer systems may be implemented alternatively.

[0165] Specifically, according to the embodiments disclosed in this application, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments disclosed in this application include a computer program product comprising a computer program carried on a computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device, or installed from storage device 1003, or installed from ROM 1002. When the computer program is executed by processing device 1001, it performs the functions defined in the methods of the embodiments disclosed in this application.

[0166] The charging pile fault detection device provided in this application, employing the charging pile fault detection method in the above embodiments, can solve the technical problem of low efficiency in detecting derating output faults in existing charging piles during charging. Compared with the prior art, the beneficial effects of the charging pile fault detection device provided in this application are the same as those of the charging pile fault detection method provided in the above embodiments, and other technical features in this charging pile fault detection device are the same as those disclosed in the previous embodiment method, and will not be repeated here.

[0167] It should be understood that the various parts disclosed in this application can be implemented using hardware, software, firmware, or a combination thereof. In the description of the above embodiments, specific features, structures, materials, or characteristics can be combined in any suitable manner in one or more embodiments or examples.

[0168] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

[0169] This application provides a computer-readable storage medium having computer-readable program instructions (i.e., a computer program) stored thereon, which are used to execute the charging pile fault detection method in the above embodiments.

[0170] The computer-readable storage medium provided in this application may be, for example, a USB flash drive, but is not limited to, electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, devices, or any combination thereof. More specific examples of computer-readable storage media may include, but are not limited to: electrical connections having one or more wires, portable computer disks, hard disks, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination thereof. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program that can be used by or in conjunction with an instruction execution system, system, or device. The program code contained on the computer-readable storage medium may be transmitted using any suitable medium, including but not limited to: wires, optical cables, RF (Radio Frequency), etc., or any suitable combination thereof.

[0171] The aforementioned computer-readable storage medium may be included in the charging pile fault detection equipment; or it may exist independently and not be assembled into the charging pile fault detection equipment.

[0172] The aforementioned computer-readable storage medium carries one or more programs. When the aforementioned one or more programs are executed by the charging pile fault detection device, the charging pile fault detection device: when the vehicle charging mode is fast charging mode, acquires the current charging time and the current remaining power; when the current charging time is greater than the charging time threshold and the current remaining power is within a preset power range, acquires the charging pile output power, the extreme output power, and the charging demand power; and determines the target fault detection result based on the charging pile output power, the extreme output power, and the charging demand power.

[0173] Computer program code for performing the operations of this application can be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, and C++, and conventional procedural programming languages ​​such as the "C" language or similar programming languages. The program code can be executed entirely on the user's computer, partially on the user's computer, as a standalone software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In cases involving remote computers, the remote computer can be connected to the user's computer via any type of network—including a Local Area Network (LAN) or a Wide Area Network (WAN)—or can be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0174] The flowcharts and block diagrams in the accompanying drawings illustrate the architecture, functionality, and operation of possible implementations of systems, methods, and computer program products according to various embodiments of this application. In this regard, each block in a flowchart or block diagram may represent a module, segment, or portion of code containing one or more executable instructions for implementing a specified logical function. It should also be noted that in some alternative implementations, the functions indicated in the blocks may occur in a different order than those indicated in the drawings. For example, two consecutively indicated blocks may actually be executed substantially in parallel, and they may sometimes be executed in reverse order, depending on the functions involved. It should also be noted that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can be implemented using a dedicated hardware-based system that performs the specified function or operation, or using a combination of dedicated hardware and computer instructions.

[0175] The modules described in the embodiments of this application can be implemented in software or hardware. The names of the modules do not necessarily limit the functionality of the unit itself.

[0176] The readable storage medium provided in this application is a computer-readable storage medium that stores computer-readable program instructions (i.e., a computer program) for executing the above-described charging pile fault detection method. This solves the technical problem of low efficiency in detecting derating output faults in existing charging piles during charging. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as those of the charging pile fault detection method provided in the above embodiments, and will not be elaborated upon here.

[0177] This application also provides a computer program product, including a computer program that, when executed by a processor, implements the steps of the charging pile fault detection method described above.

[0178] The computer program product provided in this application can solve the technical problem of low efficiency in detecting derating output faults in existing charging piles during charging. Compared with the prior art, the beneficial effects of the computer program product provided in this application are the same as those of the charging pile fault detection method provided in the above embodiments, and will not be repeated here.

[0179] The above description is only a part of the embodiments of this application and does not limit the patent scope of this application. All equivalent structural transformations made under the technical concept of this application and using the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included in the patent protection scope of this application.

Claims

1. A method for detecting faults in charging piles, characterized in that, The charging pile fault detection method includes: When the vehicle is in fast charging mode, obtain the current charging time and the current remaining battery level. When the current charging time is greater than the charging time threshold and the current remaining power is within a preset power range, the charging pile output power, extreme output power, and charging demand power are obtained. The target fault detection result is determined based on the output power of the charging pile, the extreme output power, and the charging demand power. The step of determining the target fault detection result based on the output power of the charging pile, the extreme output power, and the charging demand power includes: A first power ratio is determined based on the output power of the charging pile and the charging demand power. The second power ratio is determined based on the output power of the charging pile and the extreme output power. When the first power ratio is less than the first fast charging fault threshold and the second power ratio is less than the second fast charging fault threshold, the target fault detection result is determined to be a charging power limited fault, and a charging power limited prompt message is generated. The first fast charging fault threshold is a critical value used to determine whether there is a charging power limited fault, which is the ratio of the charging pile output power to the charging demand power. The second fast charging fault threshold is a critical value used to determine whether there is a charging power limited fault, which is the ratio of the charging pile output power to the extreme output power.

2. The method as described in claim 1, characterized in that, After the step of determining the target fault detection result based on the charging pile output power, the extreme output power, and the charging demand power, the method further includes: When the target fault detection result is a charging power limited fault, the target output power, the target extreme power, and the target required power are obtained. The first fault power ratio is determined based on the target output power and the target required power. The second fault power ratio is determined based on the target output power and the target extreme power. The fault clearing flag is determined based on the first fault power ratio and / or the second fault power ratio.

3. The method as described in claim 2, characterized in that, The step of determining the fault clearing flag bit based on the first fault power ratio and / or the second fault power ratio When the first fault power ratio is greater than or equal to the first fast charging fault clearing threshold, the fault clearing flag is determined to be in the set state; When the second fault power ratio is greater than or equal to the second fast charging fault clearing threshold, the fault clearing flag is set.

4. The method as described in claim 1, characterized in that, The charging pile fault detection method also includes: When the vehicle is in slow charging mode, obtain the current circuit resistance value; The current signal duty cycle and the target signal duty cycle are determined based on the current loop resistance value. The target fault detection result is determined based on the current signal duty cycle, the target signal duty cycle, and the slow charging fault coefficient.

5. The method as described in claim 4, characterized in that, The step of determining the target fault detection result based on the current signal duty cycle, the target signal duty cycle, and the slow charging fault coefficient includes: The fault duty cycle threshold is determined based on the target signal duty cycle and the slow charging fault coefficient; The current signal duty cycle is compared with the fault duty cycle threshold to obtain the duty cycle comparison result; When the duty cycle comparison result shows that the current signal duty cycle is less than the fault duty cycle threshold, the target fault detection result is determined to be a charging power limited fault, and a charging power limited prompt message is generated.

6. The method as described in claim 4, characterized in that, After the step of determining the target fault detection result based on the current signal duty cycle, the target signal duty cycle, and the slow charging fault coefficient, the method further includes: When the target fault detection result is a charging power limited fault, the fault circuit resistance value is obtained; The corresponding fault duty cycle and target duration are determined based on the fault circuit resistance value. When the fault duty cycle is greater than the fault clearing threshold and the target duration is greater than the preset duration threshold, the fault clearing flag is set.

7. A charging pile fault detection device, characterized in that, The device includes: The acquisition module is used to acquire the current charging time and the current remaining battery power when the vehicle is in fast charging mode. The acquisition module is also used to acquire the charging pile output power, extreme output power and charging demand power when the current charging time is greater than the charging time threshold and the current remaining power is within a preset power range. The detection module is used to determine the target fault detection result based on the output power of the charging pile, the extreme output power, and the charging demand power. The detection module is further configured to determine a first power ratio based on the output power of the charging pile and the charging demand power; determine a second power ratio based on the output power of the charging pile and the extreme output power; and determine the target fault detection result as a charging power limitation fault when the first power ratio is less than a first fast charging fault threshold and the second power ratio is less than a second fast charging fault threshold, and generate a charging power limitation prompt message. The first fast charging fault threshold is a critical value for determining the ratio of the charging pile output power to the charging demand power when a charging power limitation fault exists, and the second fast charging fault threshold is a critical value for determining the ratio of the charging pile output power to the extreme output power when a charging power limitation fault exists.

8. A charging pile fault detection device, characterized in that, The device includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, the computer program being configured to implement the steps of the charging pile fault detection method as described in any one of claims 1 to 6.

9. A storage medium, characterized in that, The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, it implements the steps of the charging pile fault detection method as described in any one of claims 1 to 6.

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