Method, device and equipment for detecting adhesion fault of European standard electric vehicle relay and medium

Abstract

The invention discloses a European standard electric vehicle relay adhesion fault detection method, device and equipment and a medium, and relates to the technical field of circuit detection, and the method comprises the steps: employing a European standard DC charging test system specified by a preset standard, compiling a DC charging test process, and carrying out the simulation fault test of a relay of an European standard electric vehicle; in the pre-charging stage, a pre-charging request sent by a vehicle is monitored, and an invalid control guide signal duty ratio or an invalid power supply charging gun head resistor is set according to the pre-charging request; voltage output is maintained, the charging state of the vehicle is observed, and whether the vehicle relay has the risk of adhesion faults or not is determined based on the response of the vehicle to the invalid control guide signal duty ratio or the invalid power supply charging gun head resistor; if the vehicle can identify invalid parameters and stop charging, the vehicle can continuously monitor the abnormal environment, and a vehicle relay does not have an adhesion fault; and if the vehicle fails to identify the invalid parameters and continues to be charged, judging that the vehicle cannot continuously monitor the abnormality and the vehicle relay has an adhesion risk.

Description

Technical Field

[0001] The present application relates to the field of circuit detection technology, and in particular to a detection method, device, equipment and medium for a European standard electric vehicle relay adhesion fault. Background Art

[0002] In the field of electricity, especially in electric vehicle charging technology, the stability of the control pilot circuit is directly related to charging safety and efficiency. As a key control component, the performance of the relay directly affects the working state of the entire system. In recent years, with the popularization of electric vehicles and the extensive construction of charging facilities, relay adhesion failures have occurred from time to time, which not only affects the normal progress of the charging process, but may also lead to safety accidents.

[0003] The main causes of relay sticking failures include abnormal communication between the vehicle and the charging pile during the pre-charging stage. For example, when the vehicle communication controller (EVCC) detects that the control pilot signal (CP) duty cycle is not in the normal range (3%-7%), it will immediately switch to a CP state of 9V, terminate the vehicle-pile communication and request to stop the TCP connection at the application layer. However, if the vehicle fails to respond in time and reduce the battery voltage at this time, and the power supply equipment has reduced the pre-charge voltage to 0V, there will be a huge voltage difference between the two ends of the relay, causing the relay to generate electric sparks, and thus stick and cannot be opened.

[0004] In addition, abnormal connection of the charging gun is also an important cause of relay adhesion. Under normal circumstances, the resistance of the charging gun tip (PP) is 1500Ω, and the vehicle should continuously detect the PP resistance value. If the vehicle fails to continuously detect or the power supply equipment fails to take protective measures in time after detecting an abnormality, there is also a risk of adhesion when the vehicle closes the relay. Summary of the invention

[0005] The purpose of this application is to provide a method, device, equipment and medium for detecting adhesion failure of a relay of a European standard electric vehicle.

[0006] To achieve the above objectives, this application provides the following solutions:

[0007] In a first aspect, the present application provides a method for detecting a European standard electric vehicle relay adhesion fault, comprising:

[0008] Use the European standard DC charging test system specified in the preset standard, write the DC charging test process, and perform simulated fault tests on the relays of European standard electric vehicles;

[0009] In the pre-charging stage, the pre-charging request sent by the vehicle is monitored, and an invalid control guidance signal duty cycle or an invalid power charging gun head resistance is set according to the pre-charging request;

[0010] Maintaining the voltage output, observing the charging state of the vehicle, and determining whether the vehicle relay has a risk of adhesion failure based on the vehicle's response to the invalid control pilot signal duty cycle or the invalid power charging gun head resistance;

[0011] If the vehicle is able to identify invalid parameters and stop charging, it is determined that the vehicle is able to continuously monitor the abnormal environment and the vehicle relay will not have a sticking failure;

[0012] If the vehicle fails to identify the invalid parameters and continues to charge, it is determined that the vehicle cannot continuously monitor the abnormality and there is a risk of adhesion of the vehicle relay.

[0013] Optionally, the step of using a European standard DC charging test system specified in a preset standard, programming a DC charging test process, and performing a simulated fault test on a relay of a European standard electric vehicle includes:

[0014] In the process of writing the DC charging test, a voltage boost target value in the pre-charging stage is set, and after the target value is reached, an invalid parameter is immediately set.

[0015] Optionally, the invalid control guidance signal duty cycle is set to be outside the normal range of 3% to 7%; the invalid power charging gun head resistance is set to 480Ω.

[0016] Optionally, the step of maintaining the voltage output, observing the vehicle charging state, and determining whether the vehicle relay has a risk of adhesion failure based on the vehicle's response to the invalid control pilot signal duty cycle or the invalid power charging gun head resistance includes:

[0017] If the vehicle recognizes invalid parameters, switches the control guidance signal state to 9V, terminates the vehicle-pile communication, and disconnects the TCP connection, then the vehicle is considered to be able to respond correctly to abnormal parameters;

[0018] If the vehicle fails to respond correctly to the invalid parameters and continues the charging process, it is considered that the vehicle cannot continuously monitor the abnormality.

[0019] Optionally, after the step of determining that the vehicle can continuously monitor the abnormal environment and the vehicle relay will not have a sticking failure if the vehicle can identify the invalid parameter and stop charging, the method further includes:

[0020] If the vehicle is in a state where it can respond correctly to abnormal parameters, the vehicle will disconnect the relay and reduce the battery voltage to 0V, thus preventing the relay from sticking.

[0021] Optionally, after the step of determining that the vehicle cannot continuously monitor the abnormality and the vehicle relay has a risk of adhesion if the vehicle fails to identify the invalid parameter and continues charging, the method further includes:

[0022] If the vehicle is in a state where it cannot respond correctly to abnormal parameters, the vehicle will remain in the charging state, and there will be a voltage difference across the relay, resulting in an increased risk of relay sticking.

[0023] Optionally, the method for detecting a European standard electric vehicle relay adhesion fault further includes:

[0024] If it is determined that there is a risk of adhesion of the vehicle relay, measures such as disconnecting the power supply, repairing or replacing the relay should be taken before actual charging to avoid the occurrence of relay adhesion failure.

[0025] In a second aspect, the present application provides a detection device for a European standard electric vehicle relay adhesion fault, comprising:

[0026] A test module, which is used to write a DC charging test process using a European standard DC charging test system specified in a preset standard, and to perform a simulated fault test on the relay of a European standard electric vehicle;

[0027] A monitoring module, used to monitor the pre-charging request sent by the vehicle during the pre-charging stage, and set an invalid control guidance signal duty cycle or an invalid power charging gun head resistance according to the pre-charging request;

[0028] A discrimination module, used to maintain voltage output, observe the charging state of the vehicle, and determine whether the vehicle relay has a risk of adhesion failure based on the vehicle's response to the invalid control guidance signal duty cycle or the invalid power charging gun head resistance;

[0029] If the vehicle is able to identify invalid parameters and stop charging, it is determined that the vehicle is able to continuously monitor the abnormal environment and the vehicle relay will not have a sticking failure;

[0030] If the vehicle fails to identify the invalid parameters and continues to charge, it is determined that the vehicle cannot continuously monitor the abnormality and there is a risk of adhesion of the vehicle relay.

[0031] Optionally, the test module is further used to:

[0032] In the process of writing the DC charging test, a voltage boost target value in the pre-charging stage is set, and after the target value is reached, an invalid parameter is immediately set.

[0033] Optionally, the invalid control guidance signal duty cycle is set to be outside the normal range of 3% to 7%; the invalid power charging gun head resistance is set to 480Ω.

[0034] Optionally, the discrimination module is further used to:

[0035] If the vehicle recognizes invalid parameters, switches the control guidance signal state to 9V, terminates the vehicle-pile communication, and disconnects the TCP connection, then the vehicle is considered to be able to respond correctly to abnormal parameters;

[0036] If the vehicle fails to respond correctly to the invalid parameters and continues the charging process, it is considered that the vehicle cannot continuously monitor the abnormality.

[0037] Optionally, the discrimination module is further used to:

[0038] If the vehicle is in a state where it can respond correctly to abnormal parameters, the vehicle will disconnect the relay and reduce the battery voltage to 0V, thus preventing the relay from sticking.

[0039] Optionally, the discrimination module is further used to:

[0040] If the vehicle is in a state where it cannot respond correctly to abnormal parameters, the vehicle will remain in the charging state, and there will be a voltage difference across the relay, resulting in an increased risk of relay sticking.

[0041] Optionally, the discrimination module is further used to:

[0042] If it is determined that there is a risk of adhesion of the vehicle relay, measures such as disconnecting the power supply, repairing or replacing the relay should be taken before actual charging to avoid the occurrence of relay adhesion failure.

[0043] In a third aspect, the present application provides a computer device, comprising: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method for detecting adhesion failure of a relay of a European standard electric vehicle as described in any one of the above.

[0044] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of any of the above-mentioned methods for detecting adhesion failures of relays of European standard electric vehicles.

[0045] In a fifth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the steps of any of the above-mentioned methods for detecting adhesion failures of relays of European standard electric vehicles.

[0046] According to the specific embodiments provided in this application, this application discloses the following technical effects:

[0047] The present application provides a detection method, device, equipment and medium for the adhesion failure of the relay of the European standard electric vehicle. By monitoring the pre-charging request sent by the vehicle during the pre-charging stage and setting the invalid control guidance signal duty cycle or the power charging gun head resistance according to the request, we can observe the vehicle's response to these invalid parameters. If the vehicle can identify and stop charging, it means that its relay system has the ability to continuously monitor abnormal environments and the risk of adhesion failure is low; conversely, if the vehicle fails to identify and continue charging, it indicates that its relay system has a risk of adhesion, which not only significantly improves the accuracy and reliability of relay fault detection, but also can promptly discover and solve potential problems before charging, thereby optimizing the safety performance of the charging process. It also helps to improve the maintenance efficiency of electric vehicles and reduce maintenance costs caused by relay failures. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] 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 will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0049] Figure 1 A schematic flow chart of a method for detecting a sticking fault of a relay of a European standard electric vehicle provided in one embodiment of the present application;

[0050] Figure 2 A circuit diagram of a European standard DC charging control guidance circuit provided in one embodiment of the present application;

[0051] Figure 3 A schematic diagram of functional modules of a device for detecting adhesion failure of a relay of a European standard electric vehicle provided in one embodiment of the present application;

[0052] Figure 4 A schematic diagram of the structure of a computer device provided in one embodiment of the present application. DETAILED DESCRIPTION

[0053] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0054] like Figure 1As shown, some embodiments of the present application provide a method for detecting a European standard electric vehicle relay adhesion fault, which includes the following steps 101 to 105. Among them:

[0055] Step 101, using a European standard DC charging test system specified in a preset standard, programming a DC charging test process, and performing a simulated fault test on a relay of a European standard electric vehicle.

[0056] For example, refer to Figure 2 , is a circuit diagram of a European standard DC charging control and guidance circuit provided in an embodiment of the present application, wherein I_DC is the current measurement value of the DC power supply output; V_DC is the voltage measurement value at the DC power supply output interface; DC+ is the DC power supply (positive electrode); DC- is the DC power supply (negative electrode); PE is the protective conductor; PP is the DC power supply charging gun tip resistor, with a resistance of 1500Ω. CP is the control guidance signal; R_pre is the pre-charge circuit resistor. K1 and K2 are the power output relays of the electric vehicle power supply equipment; K5 and K6 are the vehicle fast charging relays.

[0057] In an embodiment of the present application, a European standard DC charging test system specified by a preset standard (such as ISO 15118 or CENELEC related standards) is used. This system simulates various possible situations in the actual charging process and provides a basis for subsequent relay fault simulation testing. Writing a DC charging test process includes defining the various stages of charging (such as pre-charging, constant current charging, constant voltage charging, etc.), setting charging parameters (such as voltage, current, etc.), and defining test logic and conditions. Through these settings, we can accurately control the charging process in order to perform simulated fault tests on the relays of electric vehicles.

[0058] Step 102, in the pre-charging stage, monitor the pre-charging request sent by the vehicle, and set an invalid control guidance signal duty cycle or an invalid power charging gun head resistance according to the pre-charging request.

[0059] In an embodiment of the present application, the pre-charging stage in the charging process is a critical stage, which is used to ensure that the battery pack is in a safe state before formal charging. We monitor the pre-charging request sent by the vehicle. Once the request is received, the test system sets an invalid control guide signal duty cycle or an invalid power charging gun head resistance according to the preset logic. These invalid parameters are set manually to simulate abnormal conditions that may occur during the actual charging process. For example, the duty cycle of the control guide signal is adjusted to a value outside the normal range (such as outside 3%-7%), or the power charging gun head resistance is set to a value different from the standard value (such as 1500Ω).

[0060] Step 103, maintaining the voltage output, observing the vehicle charging state, and determining whether the vehicle relay has a risk of adhesion failure based on the vehicle's response to the invalid control guidance signal duty cycle or the invalid power charging gun head resistance.

[0061] In an embodiment of the present application, after setting the invalid parameters, the test system maintains the voltage output unchanged to observe the charging status of the vehicle. Monitor the vehicle's response to invalid parameters. If the vehicle can correctly identify an invalid control guidance signal duty cycle or an invalid power charging gun head resistance and stop the charging process accordingly, it can be considered that the vehicle has the ability to monitor abnormal conditions and the risk of relay adhesion failure is low. On the contrary, if the vehicle fails to identify these invalid parameters and continues the charging process, the risk of relay adhesion failure is higher.

[0062] Step 104 , if the vehicle is able to identify invalid parameters and stop charging, it is determined that the vehicle is able to continuously monitor the abnormal environment and the vehicle relay will not have a sticking failure.

[0063] In the embodiment of the present application, if the vehicle can identify invalid parameters and immediately stop charging, it means that the vehicle's control system has the ability to effectively monitor and respond to abnormal conditions. In this case, we can determine that the vehicle can continuously monitor the abnormal environment during charging, thereby effectively avoiding the occurrence of relay adhesion failure.

[0064] Step 105 , if the vehicle fails to identify the invalid parameters and continues charging, it is determined that the vehicle cannot continuously monitor the abnormality and there is a risk of adhesion of the vehicle relay.

[0065] In an embodiment of the present application, if the vehicle fails to recognize invalid parameters and continues the charging process, this indicates that the vehicle's control system may be defective or insufficient and cannot effectively monitor and respond to abnormal conditions during charging. In this case, the vehicle relay is at a high risk of adhesion failure. In order to ensure the safety of vehicles and personnel, we need to take timely measures, such as reminding users to perform repairs or update the vehicle control system, to reduce the probability of relay adhesion failure.

[0066] In the embodiment of the present application, by monitoring the pre-charging request sent by the vehicle during the pre-charging stage and setting an invalid control guidance signal duty cycle or power charging gun head resistance according to the request, we can observe the vehicle's response to these invalid parameters. If the vehicle can identify and stop charging, it means that its relay system has the ability to continuously monitor abnormal environments and the risk of adhesion failure is low; conversely, if the vehicle fails to identify and continue charging, it indicates that its relay system has a risk of adhesion, which not only significantly improves the accuracy and reliability of relay fault detection, but also can promptly discover and solve potential problems before charging, thereby optimizing the safety performance of the charging process. It also helps to improve the maintenance efficiency of electric vehicles and reduce maintenance costs caused by relay failures.

[0067] Optionally, the step 101 includes: in the process of writing the DC charging test, setting a voltage boost target value in the pre-charging stage, and immediately setting an invalid parameter after reaching the target value.

[0068] In the embodiment of the present application, a complete DC charging test process is written according to the charging standard of European standard electric vehicles. The process should cover all key steps from the pre-charging stage to the normal charging stage to ensure that the actual charging process can be fully simulated. In the pre-charging stage, the vehicle sends a pre-charging request to the charging system, and the request contains the target voltage value. After receiving this request, the test system sets a target value for voltage boost according to a preset algorithm or standard. This target value is usually determined based on the voltage value requested by the vehicle and the capacity of the charging system, aiming to ensure that the system voltage can reach a safe and stable level at the end of the pre-charging stage. When the voltage of the test system reaches the preset target value, the system immediately enters the next key step: setting invalid parameters. The invalid parameters here refer to the abnormal values ​​of the control guide signal duty cycle or the power charging gun head resistance. By setting these invalid parameters, the test system can simulate abnormal conditions that may occur during the charging process, such as abnormal control guide signals or damaged charging gun head resistance. These abnormal conditions usually lead to the occurrence of vehicle relay adhesion failures.

[0069] The purpose of setting invalid parameters is to observe the vehicle's response to these abnormal conditions. If the vehicle can identify these invalid parameters and immediately stop the charging process, it means that its relay system has good abnormality monitoring and processing capabilities, and the risk of adhesion failure is low. Conversely, if the vehicle fails to identify these invalid parameters and continues to charge, then its relay system may be at risk of adhesion and requires further inspection and repair.

[0070] Optionally, the invalid control pilot signal duty cycle is set to be outside the normal range of 3% to 7%. The invalid power charging gun head resistance is set to 480Ω.

[0071] In an embodiment of the present application, during the European standard DC charging process, the duty cycle of the control guide signal (CP) is an important parameter, and the normal CP duty cycle range should be between 3% and 7%. When performing a simulation test of a relay adhesion failure, the test system will deliberately set a duty cycle that is not within this normal range. This invalid duty cycle is set to simulate abnormal conditions that may occur during the charging process, such as communication failures or equipment failures. If the vehicle can identify this invalid duty cycle and immediately stop the charging process, it means that its relay system has better abnormality monitoring and processing capabilities, which can avoid the occurrence of relay adhesion failures.

[0072] The power charging gun tip resistor (PP resistor) is an important component between the charging gun tip and the vehicle charging interface. It is used to provide the necessary resistance value during the charging process to ensure the safety and stability of the charging system. When performing a simulation test of a relay adhesion failure, the test system will deliberately set an abnormal PP resistance value. By setting this invalid resistance value, the test system can simulate fault conditions such as abnormal connection of the charging gun tip or damaged resistor. If the vehicle can recognize this invalid resistance value and immediately stop the charging process, it also means that its relay system has good abnormality monitoring and handling capabilities.

[0073] Optionally, the step 103 includes:

[0074] Step 1031, if the vehicle recognizes invalid parameters, switches the control guidance signal state to 9V, terminates the vehicle-pile communication, and disconnects the TCP connection, it is considered that the vehicle can correctly respond to abnormal parameters.

[0075] In step 1032, if the vehicle fails to properly respond to the invalid parameter and continue the charging process, it is considered that the vehicle cannot continuously monitor the abnormality.

[0076] In an embodiment of the present application, when performing a simulation test of a European standard electric vehicle relay adhesion failure, the test system sets an invalid control guide signal duty cycle or an invalid power charging gun head resistance to simulate an abnormal situation during the charging process. If the vehicle can identify these invalid parameters, it will immediately take a series of actions to respond to this abnormal situation, including: Switching the control guide signal state to 9V: The vehicle will switch the state of the control guide signal (CP) to 9V, which is a specific signal state used to indicate that the vehicle has identified an abnormal situation during the charging process; Terminate vehicle-pile communication: After switching the CP state, the vehicle will terminate the communication with the charging device (pile) to avoid further abnormal charging operations; Disconnect TCP connection: The vehicle will also disconnect the TCP (Transmission Control Protocol) connection with the charging device, which is a standard protocol in network communication. Disconnecting means that the data communication between the vehicle and the charging device is completely interrupted.

[0077] When the vehicle completes the above response actions, it is considered that the vehicle can correctly respond to abnormal parameters. This shows that the vehicle's relay system has good abnormality monitoring and processing capabilities, and can take quick action after identifying invalid parameters to avoid relay adhesion failures.

[0078] If the vehicle fails to identify invalid parameters, or does not take the correct response action after identification (such as continuing the charging process), the vehicle is deemed to be unable to continuously monitor the abnormality. In this case, the vehicle may continue to perform charging operations even if there are abnormalities in the charging process. This increases the risk of relay adhesion failure because the vehicle fails to stop charging and take protective measures in time. By monitoring the vehicle's response, the test system can determine whether the vehicle has the ability to monitor and handle abnormal parameters. If the vehicle fails to respond correctly, the test system can further analyze the cause and take appropriate measures to improve the vehicle's charging system.

[0079] Optionally, after step 104, the method further includes: if the vehicle is in a state where it can correctly respond to abnormal parameters, the vehicle will disconnect the relay and reduce the battery voltage to 0V, thereby avoiding relay sticking.

[0080] In the embodiment of the present application, when performing a simulation test of a European standard electric vehicle relay adhesion failure, the test system sets an invalid control guidance signal duty cycle or an invalid power charging gun head resistance to simulate abnormal conditions during charging. If the vehicle can identify these invalid parameters and take corresponding response actions (such as switching the control guidance signal state to 9V, terminating vehicle-pile communication, and disconnecting the TCP connection), it indicates that the vehicle is in a state where it can correctly respond to abnormal parameters.

[0081] When the vehicle correctly identifies and responds to the abnormal parameters, in order to protect the relay from damage and avoid adhesion failure, the vehicle will disconnect the relay. In this process, the vehicle will control the disconnection of relays K5 and K6 (usually the vehicle fast charging relay), thereby cutting off the connection between the charging circuit and the battery.

[0082] After disconnecting the relay, the vehicle takes further steps to reduce the battery voltage to 0V. This is to ensure that after the relay is disconnected, the battery does not generate current due to the residual voltage, thereby avoiding the relay from sticking due to the current. The process of reducing the battery voltage to 0V usually involves controlling the battery management system (BMS) or related circuits to safely discharge and reduce the battery voltage.

[0083] The vehicle can quickly disconnect the relay and reduce the battery voltage to 0V after identifying abnormal conditions during the charging process. These measures help prevent relay adhesion failures caused by prolonged exposure to abnormal voltage or current. Relay adhesion is one of the common faults in the charging process of electric vehicles, which may cause charging interruptions, battery damage, and even safety accidents. Therefore, by predicting in advance and taking corresponding protective measures, the safety and reliability of the charging process can be significantly improved.

[0084] Optionally, after step 105, the method further includes: if the vehicle is in a state where it cannot correctly respond to abnormal parameters, the vehicle will remain in a charging state, and there will be a voltage difference across the relay, resulting in an increased risk of relay adhesion.

[0085] In the embodiment of the present application, when conducting a simulation test of a European standard electric vehicle relay adhesion failure, the test system sets an invalid control guidance signal duty cycle or an invalid power charging gun head resistance to simulate abnormal conditions during charging. If the vehicle fails to recognize these invalid parameters, or fails to take the correct response action (such as continuing the charging process) after recognition, it indicates that the vehicle is in a state where it cannot correctly respond to abnormal parameters.

[0086] When the vehicle is in a state where it cannot respond correctly to abnormal parameters, it continues to perform charging operations, that is, maintains the charging state. This is because the vehicle fails to recognize the abnormal situation during the charging process and therefore cannot take corresponding protective measures to interrupt charging.

[0087] While the vehicle remains charged, the relay (usually a fast-charge relay) continues to conduct, connecting the charging circuit to the battery. However, due to abnormal conditions in the charging process (such as invalid control pilot signals or resistance at the power charging gun tip), this may cause a huge voltage difference across the relay. The magnitude of the voltage difference depends on a variety of factors, including the output voltage of the charging device, the current voltage of the battery, and the resistance in the charging circuit. Under abnormal conditions, the voltage difference may far exceed the normal operating range of the relay.

[0088] When there is a huge voltage difference between the two ends of the relay, the relay contacts may be subjected to excessive electrical stress. Long-term exposure to this electrical stress may cause physical or chemical changes on the contact surface, such as melting, oxidation or corrosion. These changes will reduce the contact resistance of the contacts and increase the adhesion between the contacts, resulting in relay adhesion. Relay adhesion is one of the common faults in the charging process of electric vehicles, which may cause charging interruption, battery damage and even safety accidents.

[0089] Optionally, after step 105, the method further includes: if it is determined that the vehicle relay has a risk of adhesion, taking measures such as disconnecting the power supply, repairing or replacing the relay before actual charging to avoid the occurrence of relay adhesion failure.

[0090] In an embodiment of the present application, during the charging test or routine maintenance of a European standard electric vehicle, it may be found that the vehicle relay has a risk of adhesion. The determination of this risk is usually based on a variety of factors, including but not limited to: abnormal conditions occurring during the charging process (such as invalid control guidance signals, abnormal resistance of the power charging gun head, etc.), the service life of the relay, the vehicle charging history record, and the physical state check of the relay. Once it is determined that the vehicle relay has a risk of adhesion, immediate measures need to be taken to avoid potential failures. In order to avoid the occurrence of relay adhesion failures, necessary precautions need to be taken before actual charging. These measures should be discovered and implemented in a timely manner during charging tests or routine maintenance.

[0091] As a first precaution, disconnect the power source connected to the vehicle battery or charging equipment. This ensures that the vehicle and charging equipment are not exposed to risks such as electric shock or short circuits when repairing or replacing the relay. Disconnecting the power source also helps maintenance personnel more safely access the relay for further inspection and repair.

[0092] After disconnecting the power supply, the relay needs to be inspected and repaired. This may include cleaning the relay contacts, adjusting the contact gap, replacing damaged parts, etc. If the relay is severely damaged or is nearing the end of its service life, the best solution may be to replace it with a new one. The new relay should ensure that it meets the specifications of the vehicle and charging equipment to ensure the normal charging process.

[0093] Disconnecting the power supply, repairing or replacing the relay can ensure the normal operation and safe use of the relay, thereby protecting the vehicle and charging equipment from potential damage. In addition, these measures can also extend the service life of the relay, reduce maintenance costs, and improve the overall performance and reliability of the vehicle.

[0094] Based on the same inventive concept, the embodiment of the present application also provides a detection device for the adhesion failure of a European standard electric vehicle relay for realizing the detection method for the adhesion failure of a European standard electric vehicle relay involved above. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme recorded in the above method, so the specific limitations in one or more embodiments of the detection device for the adhesion failure of a European standard electric vehicle relay provided below can refer to the limitations of the detection method for the adhesion failure of a European standard electric vehicle relay above, and will not be repeated here.

[0095] In an exemplary embodiment, Figure 3As shown, a detection device 20 for a European standard electric vehicle relay adhesion fault is provided, comprising:

[0096] The test module 201 is used to use the European standard DC charging test system specified in the preset standard to write a DC charging test process and perform a simulated fault test on the relay of the European standard electric vehicle;

[0097] The monitoring module 202 is used to monitor the pre-charging request sent by the vehicle during the pre-charging stage, and set an invalid control guidance signal duty cycle or an invalid power charging gun head resistance according to the pre-charging request;

[0098] The determination module 203 is used to maintain the voltage output, observe the charging state of the vehicle, and determine whether the vehicle relay has a risk of adhesion failure based on the vehicle's response to the invalid control guidance signal duty cycle or the invalid power charging gun head resistance;

[0099] If the vehicle is able to identify invalid parameters and stop charging, it is determined that the vehicle is able to continuously monitor the abnormal environment and the vehicle relay will not have a sticking failure;

[0100] If the vehicle fails to identify the invalid parameters and continues to charge, it is determined that the vehicle cannot continuously monitor the abnormality and there is a risk of adhesion of the vehicle relay.

[0101] Optionally, the testing module 201 is further used to:

[0102] In the process of writing the DC charging test, a voltage boost target value in the pre-charging stage is set, and after the target value is reached, an invalid parameter is immediately set.

[0103] Optionally, the invalid control guidance signal duty cycle is set to be outside the normal range of 3% to 7%; the invalid power charging gun head resistance is set to 480Ω.

[0104] Optionally, the identification module 203 is further used to:

[0105] If the vehicle recognizes invalid parameters, switches the control guidance signal state to 9V, terminates the vehicle-pile communication, and disconnects the TCP connection, then the vehicle is considered to be able to respond correctly to abnormal parameters;

[0106] If the vehicle fails to respond correctly to the invalid parameters and continues the charging process, it is considered that the vehicle cannot continuously monitor the abnormality.

[0107] Optionally, the identification module 203 is further used to:

[0108] If the vehicle is in a state where it can respond correctly to abnormal parameters, the vehicle will disconnect the relay and reduce the battery voltage to 0V, thus preventing the relay from sticking.

[0109] Optionally, the identification module 203 is further used to:

[0110] If the vehicle is in a state where it cannot respond correctly to abnormal parameters, the vehicle will remain in the charging state, and there will be a voltage difference across the relay, resulting in an increased risk of relay sticking.

[0111] Optionally, the identification module 203 is further used to:

[0112] If it is determined that there is a risk of adhesion of the vehicle relay, measures such as disconnecting the power supply, repairing or replacing the relay should be taken before actual charging to avoid the occurrence of relay adhesion failure.

[0113] In the embodiment of the present application, by monitoring the pre-charging request sent by the vehicle during the pre-charging stage and setting an invalid control guidance signal duty cycle or power charging gun head resistance according to the request, we can observe the vehicle's response to these invalid parameters. If the vehicle can identify and stop charging, it means that its relay system has the ability to continuously monitor abnormal environments and the risk of adhesion failure is low; conversely, if the vehicle fails to identify and continue charging, it indicates that its relay system has a risk of adhesion, which not only significantly improves the accuracy and reliability of relay fault detection, but also can promptly discover and solve potential problems before charging, thereby optimizing the safety performance of the charging process. It also helps to improve the maintenance efficiency of electric vehicles and reduce maintenance costs caused by relay failures.

[0114] In an exemplary embodiment, a computer device is provided. The computer device may be a server or a terminal. The internal structure diagram thereof may be as follows: Figure 4 As shown. The computer device includes a processor, a memory, an input / output interface (Input / Output, referred to as I / O) and a communication interface. Among them, the processor, the memory and the input / output interface are connected through a system bus, and the communication interface is connected to the system bus through the input / output interface. Among them, the processor of the computer device is used to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, a computer program and a database. The internal memory provides an environment for the operation of the operating system and the computer program in the non-volatile storage medium. The database of the computer device is used to store detection data of adhesion failure of European standard electric vehicle relays. The input / output interface of the computer device is used to exchange information between the processor and an external device. The communication interface of the computer device is used to communicate with an external terminal through a network connection. When the computer program is executed by the processor, a method for detecting adhesion failure of a European standard electric vehicle relay is implemented.

[0115] Those skilled in the art will understand that Figure 4The structure shown in the figure is only a block diagram of a part of the structure related to the solution of the present application, and does not constitute a limitation on the computer device to which the solution of the present application is applied. The specific computer device may include more or fewer components than those shown in the figure, or combine certain components, or have a different arrangement of components.

[0116] In an exemplary embodiment, a computer device is further provided, including a memory and a processor, wherein a computer program is stored in the memory, and the processor implements the steps in the above-mentioned method embodiments when executing the computer program.

[0117] In an exemplary embodiment, a computer-readable storage medium is provided, storing a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0118] In an exemplary embodiment, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in the above method embodiments are implemented.

[0119] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, stored data, displayed data, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of relevant data must comply with relevant regulations.

[0120] Those of ordinary skill in the art can understand that all or part of the processes in the above-mentioned embodiment methods can be completed by instructing the relevant hardware through a computer program, and the computer program can be stored in a non-volatile computer-readable storage medium. When the computer program is executed, it can include the processes of the embodiments of the above-mentioned methods. Among them, any reference to the memory, database or other medium used in the embodiments provided in the present application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM may be in various forms, such as static random access memory (SRAM) or dynamic random access memory (DRAM).

[0121] The database involved in each embodiment provided in this application may include at least one of a relational database and a non-relational database. The non-relational database may include a distributed database based on blockchain, etc., but is not limited thereto. The processor involved in each embodiment provided in this application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., but is not limited thereto.

[0122] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0123] This article uses specific examples to illustrate the principles and implementation methods of this application. The description of the above embodiments is only used to help understand the method and core ideas of this application. At the same time, for those skilled in the art, according to the ideas of this application, there will be changes in the specific implementation methods and application scope. In summary, the content of this specification should not be understood as limiting this application.

Claims

1. A method for detecting adhesion failure of a relay of a European standard electric vehicle, characterized in that: The method for detecting the adhesion fault of the relay of the European standard electric vehicle comprises: Use the European standard DC charging test system specified in the preset standard, write the DC charging test process, and perform simulated fault tests on the relays of European standard electric vehicles; In the pre-charging stage, the pre-charging request sent by the vehicle is monitored, and an invalid control guidance signal duty cycle or an invalid power charging gun head resistance is set according to the pre-charging request; Maintaining the voltage output, observing the charging state of the vehicle, and determining whether the vehicle relay has a risk of adhesion failure based on the vehicle's response to the invalid control pilot signal duty cycle or the invalid power charging gun head resistance; If the vehicle is able to identify invalid parameters and stop charging, it is determined that the vehicle is able to continuously monitor the abnormal environment and the vehicle relay will not have a sticking failure; If the vehicle fails to identify the invalid parameters and continues to charge, it is determined that the vehicle cannot continuously monitor the abnormality and there is a risk of adhesion of the vehicle relay.

2. The method for detecting adhesion failure of a relay of a European standard electric vehicle according to claim 1, characterized in that: The steps of using the European standard DC charging test system specified in the preset standard, writing the DC charging test process, and performing a simulated fault test on the relay of the European standard electric vehicle include: In the process of writing the DC charging test, a voltage boost target value in the pre-charging stage is set, and after the target value is reached, an invalid parameter is immediately set.

3. The method for detecting adhesion failure of a relay of a European standard electric vehicle according to claim 1, characterized in that: The invalid control guidance signal duty cycle is set to be outside the normal range of 3% to 7%; the invalid power charging gun head resistance is set to 480Ω.

4. The method for detecting adhesion failure of a relay of a European standard electric vehicle according to claim 1, characterized in that: The step of maintaining the voltage output, observing the vehicle charging state, and determining whether the vehicle relay has a risk of adhesion failure based on the vehicle's response to the invalid control pilot signal duty cycle or the invalid power charging gun head resistance includes: If the vehicle recognizes invalid parameters, switches the control guidance signal state to 9V, terminates the vehicle-pile communication, and disconnects the TCP connection, then the vehicle is considered to be able to respond correctly to abnormal parameters; If the vehicle fails to respond correctly to the invalid parameters and continues the charging process, it is considered that the vehicle cannot continuously monitor the abnormality.

5. The method for detecting adhesion failure of a relay of a European standard electric vehicle according to claim 4, characterized in that: After the step of determining that the vehicle can continuously monitor the abnormal environment and the vehicle relay will not have a sticking failure if the vehicle can identify the invalid parameters and stop charging, the method further includes: If the vehicle is in a state where it can respond correctly to abnormal parameters, the vehicle will disconnect the relay and reduce the battery voltage to 0V, thus preventing the relay from sticking.

6. The method for detecting adhesion failure of a relay of a European standard electric vehicle according to claim 4, characterized in that: After the step of determining that the vehicle cannot continuously monitor the abnormality and the vehicle relay has a risk of adhesion if the vehicle fails to identify the invalid parameter and continues charging, the method further includes: If the vehicle is in a state where it cannot respond correctly to abnormal parameters, the vehicle will remain in the charging state, and there will be a voltage difference across the relay, resulting in an increased risk of relay sticking.

7. The method for detecting adhesion failure of a relay of a European standard electric vehicle according to claim 1, characterized in that: The method for detecting the adhesion fault of the relay of the European standard electric vehicle further comprises: If it is determined that there is a risk of adhesion of the vehicle relay, measures such as disconnecting the power supply, repairing or replacing the relay should be taken before actual charging to avoid the occurrence of relay adhesion failure.

8. A detection device for adhesion failure of relays of European standard electric vehicles, characterized in that: The detection device for the adhesion fault of the relay of the European standard electric vehicle comprises: A test module, which is used to write a DC charging test process using a European standard DC charging test system specified in a preset standard, and to perform a simulated fault test on the relay of a European standard electric vehicle; A monitoring module, used to monitor the pre-charging request sent by the vehicle during the pre-charging stage, and set an invalid control guidance signal duty cycle or an invalid power charging gun head resistance according to the pre-charging request; A discrimination module, used to maintain voltage output, observe the charging state of the vehicle, and determine whether the vehicle relay has a risk of adhesion failure based on the vehicle's response to the invalid control guidance signal duty cycle or the invalid power charging gun head resistance; If the vehicle is able to identify invalid parameters and stop charging, it is determined that the vehicle is able to continuously monitor the abnormal environment and the vehicle relay will not have a sticking failure; If the vehicle fails to identify the invalid parameters and continues to charge, it is determined that the vehicle cannot continuously monitor the abnormality and there is a risk of adhesion of the vehicle relay.

9. A computer device comprising: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of the method for detecting adhesion failure of a relay of a European standard electric vehicle as described in any one of claims 1 to 7.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the method for detecting adhesion failure of a relay of a European standard electric vehicle described in any one of claims 1 to 7 are implemented.

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