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

Abstract

The invention discloses a charging pile fault detection method, device and equipment and a storage medium, and relates to the technical field of vehicles, and the charging pile fault detection method comprises the steps: when a vehicle charging mode is a fast charging mode, obtaining the current charging duration and the current remaining electric quantity; when the current charging duration is greater than a charging duration threshold value and the current residual electric quantity is in a preset electric quantity interval, acquiring a charging pile output power, an extreme value output power and a charging demand power; and determining a target fault detection result according to the charging pile output power, the extreme value output power and the charging demand power. Through the designed scheme for judging the output derating fault of the AC / DC charging pile and clearing the fault, the active derating output working condition of the charging piles with different power levels caused by factors such as over-temperature or internal fault in the charging process can be accurately identified, and a prompt is sent to a user, so that the user can conveniently carry out timing and handling, and the user experience is improved. And the charging experience of the user is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle technology, and in particular to a charging pile fault detection method, device, equipment and storage medium. Background Art

[0002] With the popularity of electric vehicles, the demand for charging infrastructure is also growing. In this context, the performance and reliability of charging piles, as key equipment connecting electric vehicles to the power grid, directly affect the user's charging experience. In particular, when the charging pile reduces its output power due to overheating or internal faults, it will not only prolong the charging time, but may also have an adverse effect on the health of the electric vehicle battery, thereby affecting the user experience. Therefore, how to solve the low efficiency of existing detection of charging piles during charging. Output derating faults has become an urgent problem to be solved. Summary of the invention

[0003] The main purpose of the present application is to provide a charging pile fault detection method, device, equipment and storage medium, aiming to solve the technical problem of low efficiency in detecting charging pile faults during charging.

[0004] To achieve the above objectives, the present application proposes a charging pile fault detection method, the charging pile fault detection method comprising: 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, the charging pile output power, the extreme output power and the charging demand power are obtained; A target fault detection result is determined according to the charging pile output power, the extreme output power and the charging demand power.

[0005] In one embodiment, the step of determining a target fault detection result according to the charging pile output power, the extreme output power and the charging demand power includes: Determine a first power ratio according to the charging pile output power and the charging demand power; Determine a second power ratio according to the charging pile output power and the extreme output power; 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, it is determined that the target fault detection result is a charging power limited fault, and charging power limited prompt information is generated.

[0006] In one embodiment, after the step of determining the target fault detection result according to 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, obtaining a target output power, a target extreme power, and a target required power; Determine a first fault power ratio according to the target output power and the target required power; Determine a second fault power ratio according to the target output power and the target extreme power; A fault clearing flag is determined according to the first fault power ratio and / or the second fault power ratio.

[0007] In one embodiment, the step of determining a fault clearing flag according to the first fault power ratio and / or the second fault power ratio is: When the first fault power ratio is greater than or equal to a first fast charging fault clearing threshold, determining that the fault clearing flag is in a set state; When the second fault power ratio is greater than or equal to a second fast charging fault clearing threshold, it is determined that the fault clearing flag is in a set state.

[0008] In one embodiment, the charging pile fault detection method further includes: When the vehicle charging mode is slow charging mode, obtain the current loop resistance value; Determining a corresponding current signal duty cycle and a target signal duty cycle according to the current loop resistance value; A target fault detection result is determined according to the current signal duty cycle, the target signal duty cycle, and a slow charging fault coefficient.

[0009] In one embodiment, the step of determining a target fault detection result according to the current signal duty cycle, the target signal duty cycle, and a slow charging fault coefficient includes: Determining a fault duty cycle threshold according to the target signal duty cycle and the slow charging fault coefficient; Comparing the current signal duty cycle with the fault duty cycle threshold to obtain a duty cycle comparison result; When the duty cycle comparison result is that the current signal duty cycle is less than the fault duty cycle threshold, it is determined that the target fault detection result is a charging power limited fault, and charging power limited prompt information is generated.

[0010] In one embodiment, after the step of determining the target fault detection result according to the current signal duty cycle, the target signal duty cycle and the slow charging fault coefficient, the step further includes: When the target fault detection result is a charging power limited fault, obtaining a fault loop resistance value; Determine the corresponding fault duty ratio and target duration according to the fault loop resistance value; When the fault duty cycle is greater than a fault clearing threshold and the target duration is greater than a preset duration threshold, it is determined that the fault clearing flag is in a set state.

[0011] In addition, to achieve the above purpose, the present application also proposes a charging pile fault detection device, the charging pile fault detection device comprising: The acquisition module is used to obtain the current charging time and the current remaining power when the vehicle charging mode is the fast charging mode; The acquisition module is further configured to acquire the charging pile output power, the extreme output power, and the 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; The detection module is used to determine a target fault detection result according to the output power of the charging pile, the extreme output power and the charging demand power.

[0012] In addition, to achieve the above-mentioned purpose, the present application also proposes a charging pile fault detection device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the computer program is configured to implement the steps of the charging pile fault detection method as described above.

[0013] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by the processor, the steps of the charging pile fault detection method described above are implemented.

[0014] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the charging pile fault detection method described above are implemented.

[0015] This application obtains the current charging time and the current remaining power when the vehicle charging mode is the fast charging mode; obtains the charging pile output power, the extreme output power and the charging demand power when the current charging time is greater than the charging time threshold and the current remaining power is in the preset power range; and determines the target fault detection result according to 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 is possible to accurately identify the active derating output conditions of charging piles of different power levels during the charging process due to factors such as overheating or internal faults, and send reminders to users, which is convenient for users to deal with the timing and improve the user's charging experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0018] Figure 1 A schematic diagram of a flow chart provided for the first embodiment of the charging pile fault detection method of the present application; Figure 2 A flow chart of the second embodiment of the charging pile fault detection method of the present application; Figure 3 This is a schematic diagram of the module structure of the charging pile fault detection device according to an embodiment of the present application; Figure 4 Schematic diagram of the device structure of the hardware operating environment involved in the charging pile fault detection method in the embodiment of the present application.

[0019] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0021] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0022] The main solution of the embodiment of the present application is: when the vehicle charging mode is the fast charging mode, the current charging time and the current remaining power are obtained; when the current charging time is greater than the charging time threshold and the current remaining power is in a preset power range, the charging pile output power, the extreme output power and the charging demand power are obtained; the target fault detection result is determined according to the charging pile output power, the extreme output power and the charging demand power.

[0023] With the popularity of electric vehicles, the demand for charging infrastructure is also growing. In this context, the performance and reliability of charging piles, as key equipment connecting electric vehicles to the power grid, directly affect the user's charging experience. In particular, when the charging pile reduces its output power due to overheating or internal faults, it will not only prolong the charging time, but may also have an adverse effect on the health of the electric vehicle battery, thereby affecting the user experience. Therefore, how to solve the low efficiency of existing detection of charging piles during charging. Output derating faults has become an urgent problem to be solved.

[0024] This application obtains the current charging time and the current remaining power when the vehicle charging mode is the fast charging mode; obtains the charging pile output power, the extreme output power and the charging demand power when the current charging time is greater than the charging time threshold and the current remaining power is in the preset power range; and determines the target fault detection result according to 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 is possible to accurately identify the active derating output conditions of charging piles of different power levels during the charging process due to factors such as overheating or internal faults, and send reminders to users, which is convenient for users to deal with the timing and improve the user's charging experience.

[0025] It should be noted that the execution subject of this embodiment can be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or a charging pile fault detection device that can realize the above functions. The following takes the charging pile fault detection device as an example of the execution subject to illustrate this embodiment and the following embodiments.

[0026] Based on this, the present application embodiment provides a charging pile fault detection method, referring to Figure 1 , Figure 1 This is a flow chart of the first embodiment of the charging pile fault detection method of the present application.

[0027] In this embodiment, the charging pile fault detection method includes steps S10 to S30: Step S10, when the vehicle charging mode is the fast charging mode, obtaining the current charging time and the current remaining power; It should be noted that, for DC fast charging in this embodiment, since the DC fast charging control pilot circuit does not have a characteristic value indicating the output capacity of the charging pile, it is not possible to determine the reduced output of the charging pile by identifying the change in the control pilot circuit parameters like AC slow charging. For example, in GB / T 27930-2015 "Communication Protocol between Non-Onboard Conductive Chargers and Battery Management Systems for Electric Vehicles", the DC charging pile will send output current and output voltage information during the charging process; however, there are many brands of DC charging piles on the market, and not all brands of charging piles can accurately send output current signals and output voltage signals; therefore, for vehicles, it is not possible to simply determine whether the output of the charging pile is reduced based on the received DC pile output current signal and output voltage signal.

[0028] It can be understood that the fast charging mode refers to the DC fast charging mode, the current charging time refers to the length of time the vehicle has been in the charging state from the start of charging to the current moment, and the current remaining power refers to the ratio of the electrical energy currently stored in the battery to the total capacity of the battery during the charging process.

[0029] In a specific implementation, when it is detected that the vehicle's charging mode is the DC fast charging mode, in order to accurately identify the derating output fault of the charging pile in the DC fast charging mode, the length of time the vehicle has been in the charging state from the start of charging to the current moment and the ratio of the electrical energy currently stored in the battery to the total capacity of the battery during the charging process, that is, the current charging time and the current remaining power are obtained.

[0030] Step S20, when the current charging time is greater than the charging time threshold and the current remaining power is within a preset power range, obtaining the charging pile output power, the extreme output power and the charging demand power; It can be understood that the charging time threshold refers to the critical value of the charging time used to determine whether the fault identification conditions are met, the preset power range refers to the remaining power range pre-set for 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 actual maximum output power of the charging pile within the first 5 seconds (calibrable), and the charging demand power refers to the power required for vehicle charging.

[0031] In a specific implementation, when the current charging time is greater than the critical value of the charging time used to determine whether the fault identification conditions are met, and the current remaining power is in the pre-set remaining power range for fast charging pile output derating fault diagnosis, it indicates that the fast charging pile output derating output fault diagnosis can be performed, and then the actual output power of the charging pile, the actual maximum output power of the charging pile within the first 5 seconds (calibrable), and the power required for vehicle charging, that is, the charging pile output power, the extreme output power and the charging demand power, can be obtained.

[0032] It should be noted that during the fast charging process, part of the power supplied by the charging pile to the vehicle is used to charge the power battery, and the other part is used for consumption of high-voltage accessories (such as air conditioning consumption); therefore, the vehicle (which can be the vehicle control unit, 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.

[0033] Step S30, determining a target fault detection result according to the charging pile output power, the extreme output power and the charging demand power.

[0034] It can be understood that the target fault detection result includes a charging power limited fault result and a charging power normal result.

[0035] In the specific implementation, the fast charging pile output derating fault diagnosis is performed based on the actual output power of the charging pile, the actual maximum output power of the charging pile within the first 5 seconds (calibrable), and the power required for vehicle charging to obtain the target fault detection result.

[0036] In a feasible implementation, step S30 may include steps A31 to A33: Step A31, determining a first power ratio according to the charging pile output power and the charging demand power; It should be noted that the first power ratio refers to the ratio of the charging pile output power to the charging demand power.

[0037] In a specific implementation, a ratio calculation is performed based on the actual output power of the charging pile and the power required for charging the vehicle to obtain a ratio of the output power of the charging pile to the required charging power, that is, a first power ratio.

[0038] Step A32, determining a second power ratio according to the charging pile output power and the extreme output power; It can be understood that the second power ratio refers to the ratio of the charging pile output power to the extreme output power.

[0039] In a specific implementation, a ratio is calculated based on the actual output power of the charging pile and the actual maximum output power of the charging pile within the first 5 seconds (which can be calibrated), so as to obtain the ratio of the output power of the charging pile to the extreme output power, that is, the second power ratio.

[0040] 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, determine that the target fault detection result is a charging power limited fault, and generate charging power limited prompt information.

[0041] It can be understood that the first fast charging fault threshold refers to the critical value of the ratio of the charging pile output power to the extreme output power, which is 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 output power to the extreme output power, which is used to determine whether there is a charging power limitation fault; and the charging power limited prompt information refers to the information that prompts the user that the charging device has a derating output fault.

[0042] In a specific implementation, the first power ratio is compared with a critical value of the ratio of the charging pile output power to the extreme output power for determining whether a charging power limitation fault exists, and the second power ratio is compared with a critical value of the ratio of the charging pile output power to the extreme output power for determining whether a charging power limitation fault exists. 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 for determining whether a charging power limitation fault exists, and 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 for determining whether a charging power limitation fault exists, the target fault detection result is determined to be a charging power limitation fault, and information is generated to prompt the user that the charging device has a derating output fault.

[0043] It should be noted that in the fast charging process, the fault diagnosis strategy for the abnormal output reduction of the fast charging pile in this embodiment is as follows: 1. Since the fast charging pile will output slowly when starting the output, that is, there is a slow start strategy, so after the vehicle enters the fast charging state, it will wait for 2 minutes (calibrable) before performing the fast charging pile output reduction fault diagnosis; 2. Since the vehicle will actively reduce the charging demand current when the SOC is higher; in order to avoid misjudging the output reduction of the charging pile at a high SOC, it is stipulated that the fast charging pile output reduction fault diagnosis is only performed in the range of 0% (calibrable) ≤ SOC ≤ 90% (calibrable); 3. During the fast charging process, 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 indicate the output power of the charging pile by calculating the sum of the battery charging power and the power consumption of the high-voltage accessories; 4. During fast charging, the vehicle judges 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 judges that [current actual output power of the charging pile (battery charging power + high-voltage accessory power consumption)] / [actual maximum output power of the charging pile within the first 5s (calibrable) (battery charging power + high-voltage accessory power consumption)] < 60% (calibrable); On the premise that conditions 1 to 3 are met, if conditions 4 and 5 are met and last for 1 minute (TBD), the vehicle considers that the output power of the charging pile is limited; a flag prompt "charging power is limited" is given.

[0044] In a feasible implementation manner, step S30 may further include steps B31 to B34: Step B31, when the target fault detection result is a charging power limited fault, obtaining a target output power, a target extreme power, and a target required power; It can be understood 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 actual maximum output power of the charging pile within the first 5 seconds (calibrable) when the charging power is limited. The target demand power refers to the charging power required by the vehicle when the charging power is limited.

[0045] In a specific implementation, when it is determined that the output power of the charging pile is limited, in order to clear the charging pile output derating fault diagnosis, the actual output power of the charging pile during the charging power limitation fault, the actual maximum output power of the charging pile within the first 5 seconds (calibrable), and the charging power required by the vehicle are obtained, that is, the target output power, the target extreme power, and the target required power.

[0046] Step B32, determining a first fault power ratio according to the target output power and the target required power; It can be understood that the first fault power ratio refers to the ratio of the target output power to the target required power.

[0047] In a specific implementation, a ratio is calculated based on the actual output power of the charging pile and the charging power required by the vehicle when the charging power is limited, so as to obtain the ratio of the target output power to the target required power, that is, the first fault power ratio.

[0048] Step B33, determining a second fault power ratio according to the target output power and the target extreme power; It can be understood that the second fault power ratio refers to the ratio of the target output power to the target extreme value power.

[0049] In a specific implementation, a ratio is calculated based on the actual output power of the charging pile when the charging power is limited and the actual maximum output power of the charging pile within the first 5 seconds (which can be calibrated), so as to obtain the ratio of the target output power to the target extreme power, that is, the second fault power ratio.

[0050] Step B34: determine a fault clearing flag according to the first fault power ratio and / or the second fault power ratio.

[0051] In a specific implementation, whether the fault clearing condition is met is determined according to the ratio of the target output power to the target required power and / or the ratio of the target output power to the target extreme power, and then the fault clearing flag is determined.

[0052] In a feasible implementation, step B34 may include steps C341-C342: Step C341, when the first fault power ratio is greater than or equal to a first fast charge fault clearing threshold, determining that the fault clearing flag is in a set state; It can be understood that the first fast charging fault clearing threshold refers to the critical value of the ratio of the target output power to the target required power used to determine whether the fault clearing condition is met.

[0053] In a specific implementation, when the ratio of the target output power to the target required power is greater than or equal to a critical value of the ratio of the target output power to the target required power 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 a set state.

[0054] Step C342: When the second fault power ratio is greater than or equal to a second fast charge fault clearing threshold, determine that the fault clearing flag is in a set state.

[0055] It can be understood 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 condition is met.

[0056] In a specific implementation, when the ratio of the target output power to the target extreme power is greater than or equal to a critical value of the ratio of the target output power to the target extreme power 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 a set state.

[0057] It should be noted that during the fast charging process, when the charging equipment derating output fault is diagnosed, a reminder will be sent to the user and presented on the vehicle instrument screen or mobile phone 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 the fast charging state, 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 lasts for 20s (calibrable); 2. In the fast charging state, 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 within the first 5s (calibrable) (battery charging power + high-voltage accessory power consumption)] ≥ 120% (calibrable) and lasts for 20s (calibrable); 3. DC fast charging ends, such as swiping the card; If any of the above conditions are met, the charging equipment derating output fault flag can be cleared.

[0058] This embodiment obtains the current charging time and the current remaining power when the vehicle charging mode is the fast charging mode; obtains the charging pile output power, the extreme output power and the charging demand power when the current charging time is greater than the charging time threshold and the current remaining power is in the preset power range; and determines the target fault detection result according to 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 is possible to accurately identify the active derating output conditions of charging piles of different power levels during the charging process due to factors such as overheating or internal faults, and send reminders to users, which is convenient for users to deal with the timing and improve the user's charging experience.

[0059] Based on the first embodiment of the present application, in the second embodiment of the present application, the same or similar contents as those in the above-mentioned embodiment 1 can be referred to the above introduction, and will not be repeated in the following. Figure 2 The charging pile fault detection method further includes steps S11 to S13: Step S11, when the vehicle charging mode is a slow charging mode, obtaining the current loop resistance value; It should be noted that in this embodiment, since the AC charging device can only communicate with the vehicle through the control pilot circuit to indicate the power of the charging pile; for example, when the charging device 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 device has overheating, internal faults and other factors and the output is reduced, the output CP PWM signal duty cycle will be actively reduced. Therefore, the vehicle can diagnose whether the charging device has a reduced output performance by identifying the control pilot circuit signal.

[0060] It can be understood that the current loop resistance value refers to the resistance value of the current CC loop (control pilot circuit).

[0061] In a specific implementation, when it is detected that the charging mode of the vehicle is a slow charging mode, in order to accurately identify the derating output fault of the charging pile in the slow charging mode, the resistance value of the current CC loop, that is, the current loop resistance value, is obtained.

[0062] Step S12, determining the corresponding current signal duty cycle and target signal duty cycle according to the current loop resistance value; It can be understood that the current signal duty cycle refers to the duty cycle of the current CP PWM signal, and the target signal duty cycle refers to the standard CP PWM signal duty cycle corresponding to the CC loop resistance value. In the electric vehicle charging system, the CPPWM signal duty cycle is an important parameter used to control communication and status monitoring during the charging process. CP (ControlPilot) is part of the charging control pilot circuit, which transmits charging status and control information through PWM (Pulse Width Modulation) signals.

[0063] In a specific implementation, the duty cycle of the corresponding current CP PWM signal and the standard CP PWM signal duty cycle, ie, the current signal duty cycle and the target signal duty cycle, are determined according to the acquired resistance value of the current CC loop.

[0064] Step S13, determining a target fault detection result according to the current signal duty cycle, the target signal duty cycle and the slow charging fault coefficient.

[0065] It can be understood that the slow charging fault coefficient refers to the duty cycle coefficient used to determine whether there is a derating output fault in the slow charging mode.

[0066] In the specific implementation, the duty cycle of the corresponding current CP PWM signal and the standard CP PWM signal duty cycle are determined according to the resistance value of the current CC loop, and then the abnormal derating output fault of the slow charging pile is diagnosed in combination with the duty cycle coefficient used to determine whether there is a derating output fault in the slow charging mode to determine the target fault detection result.

[0067] In a feasible implementation, step S13 may include steps A131 to A133: Step A131, determining a fault duty cycle threshold according to the target signal duty cycle and the slow charging fault coefficient; It can be understood that the fault duty cycle threshold refers to a duty cycle critical value used to determine whether a derating output fault exists.

[0068] In a specific implementation, the duty cycle critical value for determining whether a derating output fault exists in the slow charging mode is determined by multiplying the standard CP PWM signal duty cycle corresponding to the resistance value of the current CC loop by the duty cycle coefficient used to determine whether a derating output fault exists, i.e., the fault duty cycle threshold.

[0069] Step A132, comparing the current signal duty cycle with the fault duty cycle threshold to obtain a duty cycle comparison result; It can be understood that the duty cycle comparison result refers to the comparison result between the current signal duty cycle and the fault duty cycle threshold.

[0070] In a specific implementation, the current CP PWM signal duty cycle corresponding to the resistance value of the current CC loop is compared with the duty cycle critical value used to determine whether there is a derating output fault, so as to determine the comparison result of the current signal duty cycle and the fault duty cycle threshold, that is, the duty cycle comparison result.

[0071] Step A133, when the duty cycle comparison result is that the current signal duty cycle is less than the fault duty cycle threshold, determine that the target fault detection result is a charging power limited fault, and generate charging power limited prompt information.

[0072] It can be understood that the charging power limited prompt information refers to information that prompts the user that the charging device has a derating output fault.

[0073] In a specific implementation, when the duty cycle comparison result is that the current CP PWM signal duty cycle corresponding to the resistance value of the current CC loop is less than the duty cycle critical value 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, and 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 device has a derating output fault.

[0074] It should be noted that in the slow charging process, the fault diagnosis strategy for the abnormal derating output of the slow charging pile 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 device by detecting the CC loop resistance value. When the resistance value is detected to be 1.5 kΩ and the CP PWM signal duty cycle is 17%, the maximum output current of the charging device is 10A and the power level is 2.2kW; when the resistance value is detected to be 680 Ω and the CP PWM signal duty cycle is 27%, the maximum output current of the charging device is 16A and the power level is 3.3kW (single-phase pile) or 11kw (three-phase pile); when the resistance value is detected to be 220Ω and the CP PWM signal duty cycle is 53%, the maximum output current of the charging device is 32A and the power level is 7kW; when the resistance value is detected to be 100Ω and the CP PWM signal duty cycle is 90%, the maximum output current of the charging device is 63A and the power level is 42kW (three-phase pile); 2. During AC charging, the vehicle detects a resistance value of 1.5 kΩ and the CP If the duty cycle of the PWM signal decreases by more than 20% and lasts for 100s (calibrable), such as the duty cycle of the CP PWM signal <(17%*0.8), the vehicle (which can be the vehicle controller VCU) determines that the slow charging pile is derated, and gives a flag prompt "charging power is limited"; 2.1 The vehicle detects that the resistance value is 680Ω, and the duty cycle of the CP PWM signal decreases by more than 20% and lasts for 100s (calibrable), such as the duty cycle of the CP PWM signal <(27%*0.8), the vehicle determines that the slow charging pile is derated, and gives a flag prompt "charging power is limited"; 2.2 The vehicle detects that the resistance value is 220Ω, and the duty cycle of the CP PWM signal decreases by more than 20% and lasts for 100s (calibrable), such as the duty cycle of the CP PWM signal <(53%*0.8), the vehicle determines that the slow charging pile is derated, and gives a flag prompt "charging power is limited"; 2.3 The vehicle detects that the resistance value is 100Ω, and the CP If the PWM signal duty cycle decreases by more than 20% and lasts for 100s (calibrable), such as the CP PWM signal duty cycle < (90%*0.8), the vehicle is judged as slow charging pile derated, and a flag prompt "charging power limited" is given.

[0075] In a feasible implementation manner, step S13 may further include steps B131 to B133: Step B131, when the target fault detection result is a charging power limited fault, obtaining a fault loop resistance value; It can be understood that the fault circuit resistance value refers to the resistance value of the CC circuit when the slow charging pile has a derating fault.

[0076] In a specific implementation, when it is determined that a slow charging pile has a derating fault, in order to clear the diagnosis of the charging pile derating output fault, the resistance value of the CC circuit when the slow charging pile has a derating fault is obtained.

[0077] Step B132, determining a corresponding fault duty ratio and a target duration according to the fault loop resistance value; It can be understood that the fault duty cycle refers to the CP PWM signal duty cycle when the slow charging pile is derated, and the target duration refers to the duration of the fault duty cycle. The target duration can be set according to the specific situation, and this embodiment does not limit this.

[0078] In a specific implementation, the corresponding CP PWM signal duty cycle is determined according to the resistance value of the CC circuit when the slow charging pile is derated, and the duration of the fault duty cycle is collected to obtain the fault duty cycle and the target duration.

[0079] 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 a set state.

[0080] It can be understood that the fault clearing threshold refers to the duty cycle critical value used to determine whether the slow charging pile derating fault is met, and the preset duration threshold refers to the duration critical value used to determine whether the slow charging pile derating fault is met.

[0081] In a specific implementation, when a slow charging pile derating fault occurs, the CP PWM signal duty cycle is greater than the duty cycle critical value 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 critical value used to determine whether the slow charging pile derating fault is met, indicating that the fault clearing conditions are met, and then determining that the fault clearing flag is in a set state.

[0082] It should be noted that in this embodiment, when a charging equipment derating output fault is diagnosed during the slow charging process, a reminder will be sent to the user and presented on the vehicle instrument screen or mobile phone 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 the AC slow charging state, the vehicle detects a resistance value of 1.5 kΩ, and has diagnosed a charging equipment derating output fault. When it is detected that the CP PWM duty cycle is ≥ (17%*0.85) and lasts for 10s (calibrable), the vehicle (which can be the vehicle controller VCU) determines that the slow charging pile derating fault has recovered and clears the fault flag; 2. In the AC slow charging state, the vehicle detects a resistance value of 680Ω, and has diagnosed a charging equipment derating output fault. When it is detected that the CP PWM duty cycle ≥ (27% * 0.85) and lasts for 10s (calibrable), the vehicle (which can be the vehicle controller VCU) determines that the slow charging pile has recovered from the derating fault and clears the fault flag; 3. In the AC slow charging state, the vehicle detects that the resistance value is 220Ω, and the charging equipment has been diagnosed with a derating output fault. When the CPPWM duty cycle is detected to be ≥ (53% * 0.85) and lasts for 10s (calibrable), the vehicle (which can be the vehicle controller VCU) determines that the slow charging pile has recovered from the derating fault and clears the fault flag; 4. In the AC slow charging state, the vehicle detects that the resistance value is 100Ω, and the charging equipment has been diagnosed with a derating output fault. When the CP is detected If the PWM duty cycle is ≥ (90%*0.85) and lasts for 10s (calibrable), the vehicle (which can be the vehicle controller VCU) determines that the slow charging pile derating fault has recovered and clears the fault flag; 5. The AC slow charging ends, such as swiping a card to end the slow charging, pulling out the gun to end the slow charging, etc. If any of the above conditions are met, the charging equipment derating output fault flag can be cleared.

[0083] This embodiment obtains the current loop resistance value when the vehicle charging mode is slow charging mode; determines the corresponding current signal duty cycle and target signal duty cycle according to the current loop resistance value; and determines the target fault detection result according to 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 the charging process and sending reminders to the user in a timely manner, the user can understand the reason for the slow charging and respond in time.

[0084] It should be noted that the above examples are only used to understand the present application and do not constitute a limitation on the charging pile fault detection method of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0085] This application also provides a charging pile fault detection device, please refer to Figure 3 , the charging pile fault detection device comprises: The acquisition module 10 is used to obtain the current charging time and the current remaining power when the vehicle charging mode is the fast charging mode; The acquisition module 10 is further configured to acquire the charging pile output power, the extreme output power, and the 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 20 is used to determine a target fault detection result according to the charging pile output power, the extreme output power and the charging demand power.

[0086] Optionally, the detection module 20 is further used to: Determine a first power ratio according to the charging pile output power and the charging demand power; Determine a second power ratio according to the charging pile output power and the extreme output power; 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, it is determined that the target fault detection result is a charging power limited fault, and charging power limited prompt information is generated.

[0087] Optionally, the detection module 20 is further used to: When the target fault detection result is a charging power limited fault, obtaining a target output power, a target extreme power, and a target required power; Determine a first fault power ratio according to the target output power and the target required power; Determine a second fault power ratio according to the target output power and the target extreme power; A fault clearing flag is determined according to the first fault power ratio and / or the second fault power ratio.

[0088] Optionally, the detection module 20 is further used for: When the first fault power ratio is greater than or equal to a first fast charging fault clearing threshold, determining that the fault clearing flag is in a set state; When the second fault power ratio is greater than or equal to a second fast charging fault clearing threshold, it is determined that the fault clearing flag is in a set state.

[0089] Optionally, the detection module 20 is further used for: When the vehicle charging mode is slow charging mode, obtain the current loop resistance value; Determining a corresponding current signal duty cycle and a target signal duty cycle according to the current loop resistance value; A target fault detection result is determined according to the current signal duty cycle, the target signal duty cycle, and a slow charging fault coefficient.

[0090] Optionally, the detection module 20 is further used for: Determining a fault duty cycle threshold according to the target signal duty cycle and the slow charging fault coefficient; Comparing the current signal duty cycle with the fault duty cycle threshold to obtain a duty cycle comparison result; When the duty cycle comparison result is that the current signal duty cycle is less than the fault duty cycle threshold, it is determined that the target fault detection result is a charging power limited fault, and charging power limited prompt information is generated.

[0091] Optionally, the detection module 20 is further used for: When the target fault detection result is a charging power limited fault, obtaining a fault loop resistance value; Determine the corresponding fault duty ratio and target duration according to the fault loop resistance value; When the fault duty cycle is greater than a fault clearing threshold and the target duration is greater than a preset duration threshold, it is determined that the fault clearing flag is in a set state.

[0092] The charging pile fault detection device provided by the present application adopts the charging pile fault detection method in the above embodiment, which can solve the technical problem of low efficiency of detecting the fault of the existing charging pile during the charging process. Compared with the prior art, the beneficial effects of the charging pile fault detection device provided by the present application are the same as the beneficial effects of the charging pile fault detection method provided by the above embodiment, and the other technical features of the charging pile fault detection device are the same as the features disclosed in the above embodiment method, which will not be repeated here.

[0093] The present application provides a charging pile fault detection device, which includes: at least one processor; and a memory that is communicatively connected to the at least one processor; wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the charging pile fault detection method in the above-mentioned embodiment one.

[0094] Reference below Figure 4, which shows a schematic diagram of the structure of a charging pile fault detection device suitable for implementing the embodiment of the present application. The charging pile fault detection device in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 4 The charging pile fault detection device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0095] like Figure 4 As shown, the charging pile fault detection device may include a processing device 1001 (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the charging pile fault detection device are also stored. The processing device 1001, ROM1002 and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touchpad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the charging pile fault detection device to communicate wirelessly or wired with other devices to exchange data. Although the figure shows a charging pile fault detection device with various systems, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or provided instead.

[0096] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0097] The charging pile fault detection device provided by the present application adopts the charging pile fault detection method in the above embodiment, which can solve the technical problem of low efficiency of detecting the fault of the charging pile during the charging process. Compared with the prior art, the beneficial effects of the charging pile fault detection device provided by the present application are the same as the beneficial effects of the charging pile fault detection method provided by the above embodiment, and the other technical features in the charging pile fault detection device are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0098] It should be understood that the various parts disclosed in this application can be implemented by 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 one or more embodiments or examples in a suitable manner.

[0099] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0100] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the charging pile fault detection method in the above-mentioned embodiment.

[0101] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems, systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM: Random Access Memory), a read-only memory (ROM: Read Only Memory), an erasable programmable read-only memory (EPROM: Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM: CD-Read Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system, system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency: Radio Frequency), etc., or any suitable combination of the above.

[0102] The above-mentioned computer-readable storage medium may be included in the charging pile fault detection device; or it may exist independently without being assembled into the charging pile fault detection device.

[0103] The above-mentioned computer-readable storage medium carries one or more programs. When the above-mentioned 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 the fast charging mode, obtains 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 in a preset power range, obtains the charging pile output power, the extreme output power and the charging demand power; determines the target fault detection result according to the charging pile output power, the extreme output power and the charging demand power.

[0104] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0105] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0106] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0107] The readable storage medium provided in the present application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned charging pile fault detection method, and can solve the technical problem of low efficiency in detecting the derating output fault of the existing charging pile during the charging process. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in the present application are the same as the beneficial effects of the charging pile fault detection method provided in the above-mentioned embodiment, and will not be elaborated here.

[0108] The present application also provides a computer program product, including a computer program, which implements the steps of the above-mentioned charging pile fault detection method when executed by a processor.

[0109] The computer program product provided by the present application can solve the technical problem of low efficiency in detecting the fault of the charging pile during the charging process. Compared with the prior art, the beneficial effects of the computer program product provided by the present application are the same as those of the charging pile fault detection method provided by the above embodiment, which will not be described in detail here.

[0110] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A charging pile fault detection method, characterized in that: The charging pile fault detection method comprises: 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, the charging pile output power, the extreme output power and the charging demand power are obtained; A target fault detection result is determined according to the charging pile output power, the extreme output power and the charging demand power.

2. The method according to claim 1, characterized in that The step of determining the target fault detection result according to the charging pile output power, the extreme output power and the charging demand power comprises: Determine a first power ratio according to the charging pile output power and the charging demand power; Determine a second power ratio according to the charging pile output power and the extreme output power; 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, it is determined that the target fault detection result is a charging power limited fault, and charging power limited prompt information is generated.

3. The method according to claim 1, characterized in that After the step of determining the target fault detection result according to 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, obtaining a target output power, a target extreme power, and a target required power; Determine a first fault power ratio according to the target output power and the target required power; Determine a second fault power ratio according to the target output power and the target extreme power; A fault clearing flag is determined according to the first fault power ratio and / or the second fault power ratio.

4. The method according to claim 3, characterized in that The step of determining a fault clearing flag bit according to the first fault power ratio and / or the second fault power ratio, When the first fault power ratio is greater than or equal to a first fast charging fault clearing threshold, determining that the fault clearing flag is in a set state; When the second fault power ratio is greater than or equal to a second fast charging fault clearing threshold, it is determined that the fault clearing flag is in a set state.

5. The method according to claim 1, characterized in that The charging pile fault detection method also includes: When the vehicle charging mode is slow charging mode, obtain the current loop resistance value; Determining a corresponding current signal duty cycle and a target signal duty cycle according to the current loop resistance value; A target fault detection result is determined according to the current signal duty cycle, the target signal duty cycle, and a slow charging fault coefficient.

6. The method according to claim 5, characterized in that The step of determining a target fault detection result according to the current signal duty cycle, the target signal duty cycle, and a slow charging fault coefficient includes: Determining a fault duty cycle threshold according to the target signal duty cycle and a slow charging fault coefficient; Comparing the current signal duty cycle with the fault duty cycle threshold to obtain a duty cycle comparison result; When the duty cycle comparison result is that the current signal duty cycle is less than the fault duty cycle threshold, it is determined that the target fault detection result is a charging power limited fault, and charging power limited prompt information is generated.

7. The method according to claim 5, characterized in that After the step of determining the target fault detection result according to 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, obtaining a fault loop resistance value; Determine the corresponding fault duty ratio and target duration according to the fault loop resistance value; When the fault duty cycle is greater than a fault clearing threshold and the target duration is greater than a preset duration threshold, it is determined that the fault clearing flag is in a set state.

8. A charging pile fault detection device, characterized in that: The device comprises: The acquisition module is used to obtain the current charging time and the current remaining power when the vehicle charging mode is the fast charging mode; The acquisition module is further configured to acquire the charging pile output power, the extreme output power, and the 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 a target fault detection result according to the charging pile output power, the extreme output power and the charging demand power.

9. A charging pile fault detection device, characterized in that: The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the charging pile fault detection method according to any one of claims 1 to 7.

10. 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, the steps of the charging pile fault detection method according to any one of claims 1 to 7 are implemented.

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