A method and device for determining a charging fault

Abstract

The present invention provides a method and device for determining a charging fault. The determining method includes: in the case of a failure event of the vehicle's AC charging startup, analyzing a first fault tree established in advance for causing the charging startup failure by using the fault tree analysis method to obtain a target bottom event that causes the vehicle charging failure and a target intermediate event connected to the target bottom event. Wherein, the top event of the first fault tree is: after the vehicle is connected to the charging gun, the vehicle's AC charging startup fails; outputting the target bottom event that causes the vehicle's AC charging failure and the target intermediate event connected to the target bottom event. In the case of a failure of the vehicle's AC charging startup, outputting the target bottom event and the target intermediate event connected to the target bottom event can enable the maintenance personnel to understand the cause of the vehicle's failure and the root cause of the vehicle's failure. Furthermore, the maintenance personnel can conduct fault troubleshooting, quickly locate the problems of the vehicle, thereby improving the efficiency of problem-solving and saving time.

Description

Technical Field

[0001] The present invention relates to the field of electric vehicles, and particularly to a method and device for determining a charging fault. Background Art

[0002] With the continuous development of technology, electric vehicles are becoming increasingly popular. As is well known, different from fuel vehicles, the main power source of electric vehicles is the power battery. During the charging process of an electric vehicle, a charging fault is very likely to occur. When a charging fault occurs, how to improve the maintenance efficiency needs to be considered. Summary of the Invention

[0003] The purpose of the present invention is to provide a method and device for determining a charging fault, so as to improve the maintenance efficiency when a charging fault occurs in a vehicle.

[0004] To achieve the above purpose, the present invention provides a method for determining a charging fault, including: in the case of a failure event of the vehicle's AC charging startup, analyzing a first fault tree established in advance for causing the charging startup failure by using the fault tree analysis method, to obtain a target bottom event that causes the vehicle's charging failure and a target intermediate event connected to the target bottom event, wherein the top event of the first fault tree is: after the vehicle connects the charging gun, the vehicle's AC charging startup fails; outputting the target bottom event that causes the vehicle's AC charging failure and the target intermediate event connected to the target bottom event.

[0005] Optionally, the target intermediate event includes: a first target intermediate event, and the first target intermediate event is: the maximum allowable input current setting of the on-vehicle charger fails; the target bottom event includes: a first target bottom event connected to the first target intermediate event through an OR gate, and the first target bottom event includes: an on-vehicle charger fault and a battery management system fault.

[0006] Optionally, the target intermediate event further includes: a second target intermediate event, and the second target intermediate event is: the charging connection device is not fully connected, and the first target intermediate event and the second target intermediate event are connected through an OR gate; the target bottom event further includes: a second target bottom event connected to the second target intermediate event through an OR gate, and the second target bottom event includes at least one of the following: the contactor K1 cannot be closed; the contactor K2 cannot be closed; a power supply device fault.

[0007] Optionally, the target intermediate event further includes: a third target intermediate event, where the third target intermediate event is: the vehicle is not ready, and the third target intermediate event and the second target bottom event are connected to the second target intermediate event through an OR gate; the target bottom event further includes: a third target bottom event connected to the third target intermediate event through an OR gate, and the third target bottom event includes: the relay switch S2 cannot be closed and the battery management system fails.

[0008] Optionally, the target intermediate event further includes: a fourth target intermediate event, where the fourth target intermediate event is that the charging connection device is not fully connected, and the fourth target intermediate event and the third target bottom event are connected to the third target intermediate event through an OR gate; the target bottom event further includes: a fourth target bottom event connected to the fourth target intermediate event through an OR gate, and the fourth target bottom event is: the power supply device fails.

[0009] Optionally, the target intermediate event further includes: a fifth target intermediate event, where the fifth target intermediate event is that the relay switch S1 is not switched to pulse width modulation, and the fifth target intermediate event and the fourth target bottom event are connected to the fourth target intermediate event through an OR gate; the target bottom event further includes: a fifth target bottom event connected to the fifth target intermediate event through an OR gate, and the fifth target bottom event includes at least two of the following: the relay switch S1 fails; the electronic lock fails; the relay switch S3 fails.

[0010] Optionally, the target intermediate event further includes: a sixth target intermediate event and / or a seventh target intermediate event, where the sixth target intermediate event is: the on-vehicle charger is in a non-chargeable state, and the seventh target intermediate event is: the battery pack is in a non-chargeable state, and the sixth target intermediate event, the seventh target intermediate event, the fourth target intermediate event, and the third target bottom event are connected to the third target intermediate event through an OR gate; the target bottom event further includes: a sixth target bottom event connected to the sixth target intermediate event through an OR gate and / or a seventh target bottom event connected to the seventh target intermediate event through an OR gate; the sixth target bottom event is: the on-vehicle charger fails and the battery management system fails; the seventh target bottom event is: the battery fails and the battery management system fails.

[0011] Optionally, it further includes: determining the probability of the occurrence of the target bottom event, and outputting the target bottom event and the probability corresponding to the target bottom event.

[0012] Another embodiment of the present invention provides a device for determining a charging fault. The determining device includes: a determining module, configured to, when a vehicle charging start failure event occurs, analyze a first fault tree for causing charging start failure established in advance by using a fault tree analysis method, to obtain a target bottom event for causing vehicle charging failure and a target intermediate event connected to the target bottom event, wherein the top event of the first fault tree is: after the vehicle is connected to the charging gun, the vehicle AC charging start fails; an output module, configured to output the target bottom event for causing vehicle charging failure and the target intermediate event connected to the target bottom event.

[0013] Another embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the above-mentioned determining method is implemented.

[0014] The above technical solution of the present invention has at least the following beneficial effects:

[0015] In the determining method of the embodiment of the present invention, when the vehicle AC charging start fails, maintenance personnel need to conduct a comprehensive inspection of the vehicle, with low efficiency and high consumption of manpower and material resources. In the determining method of the embodiment of the present invention, by outputting the target bottom event when the vehicle AC charging start fails, maintenance personnel can understand the cause of the vehicle failure, and by outputting the target intermediate event connected to the target bottom event, maintenance personnel can understand the root cause of the vehicle failure. Then, maintenance personnel can conduct fault troubleshooting based on the output target bottom event and the target intermediate event connected to the target bottom event, quickly locate the problem of the vehicle, improve the efficiency of problem-solving, save time, and further improve the reliability of fault troubleshooting. Description of the Drawings

[0016] Figure 1 is a schematic diagram of a charging control guiding circuit provided by an embodiment of the present invention;

[0017] Figure 2 is a diagram of an AC charging connection process and control timing provided by an embodiment of the present invention;

[0018] Figure 3 is a schematic flowchart of a method for determining a charging fault provided by an embodiment of the present invention;

[0019] Figure 4 is a fault tree of vehicle AC charging start failure provided by an embodiment of the present invention;

[0020] Figure 5 is another fault tree of vehicle AC charging start failure provided by an embodiment of the present invention;

[0021] Figure 6 A flowchart showing another method for determining a charging fault provided by an embodiment of the present invention;

[0022] Figure 7 A structural diagram of a device for determining a charging fault provided by an embodiment of the present invention. Detailed implementation manners

[0023] To make the technical problems, technical solutions and advantages to be solved by the present invention clearer, the following will be described in detail with reference to the accompanying drawings and specific embodiments. In the following description, specific details such as specific configurations and components are provided only to help a comprehensive understanding of the embodiments of the present invention. Therefore, those skilled in the art should clearly understand that various changes and modifications can be made to the embodiments described herein without departing from the scope and spirit of the present invention. In addition, descriptions of known functions and structures are omitted for clarity and conciseness.

[0024] It should be understood that the term "one embodiment" or "an embodiment" mentioned throughout the specification means that a specific feature, structure or characteristic related to the embodiment is included in at least one embodiment of the present invention. Therefore, the appearances of "in one embodiment" or "in an embodiment" throughout the specification do not necessarily refer to the same embodiment. In addition, these specific features, structures or characteristics can be combined in any suitable manner in one or more embodiments.

[0025] In various embodiments of the present invention, it should be understood that the magnitudes of the serial numbers of the following processes do not mean the order of execution is prior or subsequent. The order of execution of each process should be determined by its function and internal logic, and should not constitute any limitation to the implementation process of the embodiments of the present invention.

[0026] It should be understood that the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. In addition, the character " / " in this article generally represents an "or" relationship between the associated objects before and after.

[0027] In the embodiments provided by the present invention, it should be understood that "B corresponding to A" means that B is associated with A, and B can be determined according to A. However, it should also be understood that determining B according to A does not mean determining B only according to A, and B can also be determined according to A and / or other information.

[0028] See Figure 1, which is a schematic diagram of a charging control and guidance circuit provided by the present invention. The determination method of the present invention is applied to electric vehicles, for example, to the vehicle AC charging control system of electric vehicles. It should be noted that the vehicle AC charging control system is a relatively complex control system, which is a complex circuit control composed of a power supply device (including a power supply control device), an electric vehicle (including a vehicle control device and an on-board charger), and a vehicle-pile connection part. Among them, the power supply device can be represented by C. The function of the AC charging control system is to control the opening and closing of different relay switches, so as to complete the full-process control of the electric vehicle from charging preparation, charging to charging end. In Figure 1 , the relay switch S1 is an internal switch of the power supply device, which is used to send a Pulse Width Modulation (PWM) signal. The relay switch S2 is an internal switch of the vehicle, which is used to connect the internal charging circuit of the vehicle. The relay switch S3 is a normally closed internal switch of the vehicle plug, which is linked with the push-down button (used to trigger the mechanical locking device) on the charging gun plug. When the button is pressed to release the mechanical locking function, S3 is in the off state.

[0029] The voltage value at detection point 1 is used by the power supply control device to judge whether the charging connection device is fully connected and whether the vehicle is ready. The PWM signal at detection point 2 is used by the vehicle control device to judge whether the charging connection device is fully connected and to confirm the maximum supply current of the current power supply device. The resistance value between detection point 3 and Protecting Earthing (PE) is used by the vehicle control device to judge whether the vehicle plug and the vehicle socket are fully connected and to confirm the rated capacity of the current charging connection device (cable). The contactors K1 and K2 are internal contactors of the power supply device, which are used to conduct the AC power supply circuit.

[0030] Next, refer to Figure 2 , which is a process and control timing diagram of an AC charging connection provided by the present invention. The key working control program of the charging process is as follows: The vehicle plug is inserted into the vehicle socket. After S3 is opened and then closed, the electronic lock is closed to make the vehicle in a non-drivable state, and it is confirmed that the vehicle interface is fully connected. Among them, the electronic lock can be represented by E. S1 switches from the +12V connection state to the PWM connection state, and it is confirmed that the charging connection device is fully connected. The S2 switch is closed, the vehicle is ready, and the power supply device is ready. The contactors K1 and K2 are closed to start the charging system, check the connection state of the power supply interface and the change of the power supply capacity of the power supply device, and under normal conditions, the charging ends or stops.

[0031] Next, refer to Figure 3 , which is a schematic flowchart of a method for determining a charging fault provided by the present invention. An embodiment of the present invention provides a method for determining a charging fault, and the determination method includes the following steps:

[0032] Step 31: In the case of a failure in the start of the vehicle's AC charging, use the fault tree analysis method to analyze the pre-established first fault tree for charging start failure, and obtain the target bottom events that cause the vehicle charging failure and the target intermediate events connected to the target bottom events. Among them, the top event of the first fault tree is: after the vehicle is connected to the charging gun, the start of the vehicle's AC charging fails.

[0033] It should be noted that the fault tree analysis method takes the fault state that is not desired to occur in the system as the target of fault analysis, and this target is defined as the "top event" in the fault tree analysis. In the analysis, it is required to find all possible direct causes that lead to this fault. These causes are called "intermediate events" in the fault tree analysis. Then, trace and find all possible causes that lead to each intermediate event, and cycle progressively until a basic cause for the analysis object is traced. This basic cause is defined as the "bottom event" in the fault tree analysis. Among them, the number of the target bottom events may be one or more. When there are multiple target bottom events, the target intermediate events connected to the multiple target bottom events may be the same target intermediate event or different target intermediate events. When the number of target bottom events is one, the target bottom event may also correspond to different target intermediate events.

[0034] Step 32: Output the target bottom events that cause the failure in the start of the vehicle's AC charging and the target intermediate events connected to the target bottom events.

[0035] It should be noted that in the case of a failure in the start of the vehicle's AC charging, the maintenance personnel need to conduct a comprehensive inspection of the vehicle, which is inefficient and consumes manpower and material resources. The determination method of the embodiment of the present invention, by outputting the target bottom events in the case of a failure in the start of the vehicle's AC charging, can enable the maintenance personnel to understand the reasons for the vehicle's failure, and outputting the target intermediate events connected to the target bottom events can enable the maintenance personnel to understand the root causes of the vehicle's failure. Furthermore, the maintenance personnel can conduct fault troubleshooting based on the output target bottom events and the target intermediate events connected to the target bottom events, quickly locate the problems of the vehicle, improve the efficiency of problem-solving, save time, and further improve the reliability of fault troubleshooting.

[0036] For example, the output target bottom events and the intermediate events connected to the target bottom events can be BMS software failure - failure in setting the maximum allowable input current of the on-vehicle charger. For another example, it can also be BMS software failure - S2 not closed. Examples are not listed one by one here.

[0037] Next, refer to Figure 4, a fault tree for the failure of the vehicle AC charging startup provided by the present invention. The determination method of the embodiment of the present invention, the target intermediate event includes: a first target intermediate event, and the first target intermediate event is: the failure of setting the maximum allowable input current of the on-board charger (OBC); the target bottom event includes: a first target bottom event connected to the first target intermediate event through an OR gate, and the first target bottom event includes: OBC failure and battery management system (BMS) failure. Optionally, the BMS failure can also be referred to as the BMS software failure in this article. The BMS software failure here can specifically be the error of the BMS output charging current command (induced failure).

[0038] It should be noted that since there may be multiple types of BMS failures, the different failures of the BMS will be combined below and collectively referred to as the BMS software failure.

[0039] The determination method of the embodiment of the present invention, the target intermediate event further includes: a second target intermediate event, and the second target intermediate event is: the charging connection device is not fully connected, and the first target intermediate event and the second target intermediate event are connected through an OR gate; the target bottom event further includes: a second target bottom event connected to the second target intermediate event through an OR gate, and the second target bottom event includes at least one of the following: the contactor K1 cannot be closed; the contactor K2 cannot be closed; the power supply device failure.

[0040] It should be noted that the charging connection device is not fully connected. For example, it can be that the power supply device is not ready. Among them, the inability to close the contactor K1 and the inability to close the contactor K2 generally refer to the primary failure.

[0041] Optionally, the first fault tree further includes a first unexplored event, and the first unexplored event is that the contactor K1 cannot be closed and the contactor K2 cannot be closed; among them, the inability to close the contactor K1 and the inability to close the contactor K2 are both induced failures. Since the relevant information of the first unexplored event is unclear or has no impact on the subsequent events, therefore, the impact of the first unexplored event on the top event can be not considered here. Optionally, the unexplored event in this article can also be referred to as the undeveloped event.

[0042] The determination method of the embodiment of the present invention, the target intermediate event further includes: a third target intermediate event, and the third target intermediate event is: the vehicle is not ready, and the third target intermediate event and the second target bottom event are connected to the second target intermediate event through an OR gate; the target bottom event further includes: a third target bottom event connected to the third target intermediate event through an OR gate, and the third target bottom event includes: the relay switch S2 cannot be closed and the battery management system failure.

[0043] It should be noted that the vehicle is not ready. For example, the relay switch S2 may not be closed, or Figure 1 the voltage value of the detection point 1 in [] is abnormal. Here, taking the vehicle not being ready with the relay switch S2 not closed as an example for illustration. When the third target intermediate event is that the relay switch S2 is not closed, the third target basic events include: the relay switch S2 cannot be closed and the BMS software fails. Among them, the BMS software failure can specifically be that the BMS control instruction for the relay switch S2 to close is incorrect.

[0044] Optionally, the first fault tree further includes a second unexplained event, and the second unexplained event is that the OBC fails to execute the closing of the relay switch S2; the second unexplained event and the third target basic events are connected to the third target intermediate event through an OR gate.

[0045] In the determination method of the embodiment of the present invention, the target intermediate event further includes: a fourth target intermediate event, and the fourth target intermediate event is that the charging connection device is not fully connected. The fourth target intermediate event and the third target basic events are connected to the third target intermediate event through an OR gate; the target basic event further includes: a fourth target basic event connected to the fourth target intermediate event through an OR gate, and the fourth target basic event is: a power supply device failure.

[0046] Optionally, the first fault tree further includes a third unexplained event and / or a fourth unexplained event. The third unexplained event and / or the fourth unexplained event are both connected to the fourth target basic event through an OR gate and the fourth target intermediate event; the third unexplained event is that the voltage value of the detection point 1 is abnormal, and the fourth unexplained event is that the PWM signal of the detection point 2 is abnormal.

[0047] In the determination method of the embodiment of the present invention, the target intermediate event further includes: a fifth target intermediate event, and the fifth target intermediate event is that the relay switch S1 is not switched to pulse width modulation. The fifth target intermediate event and the fourth target basic event are connected to the fourth target intermediate event through an OR gate; the target basic event further includes: a fifth target basic event connected to the fifth target intermediate event through an OR gate, and the fifth target basic event includes at least two of the following: S1 switch failure; electronic lock E failure; relay switch S3 failure.

[0048] It should be noted that the relay switch S1 failure in the fifth target basic event refers to the original failure.

[0049] Optionally, the first fault tree further includes a fifth undetected event and / or a sixth undetected event, both the fifth undetected event and / or the sixth undetected event are connected to the fifth target bottom event through an OR gate and the fifth target intermediate event; the fifth undetected event is a relay switch S1 failure (induced failure), and the sixth undetected event is an abnormal resistance value at detection point 3.

[0050] In the determination method according to an embodiment of the present invention, the target intermediate event further includes: a sixth target intermediate event and / or a seventh target intermediate event, the sixth target intermediate event is: the on-vehicle charger is in a non-chargeable state, and the seventh target intermediate event is: the battery pack is in a non-chargeable state, the sixth target intermediate event, the seventh target intermediate event, the fourth target intermediate event, and the third target bottom event are all connected to the third target intermediate event through an OR gate; the target bottom event further includes: a sixth target bottom event connected to the sixth target intermediate event through an OR gate and / or a seventh target bottom event connected to the seventh target intermediate event through an OR gate; the sixth target bottom event is: on-vehicle charger failure and battery management system failure; the seventh target bottom event is: battery (Battery, B) failure and battery management system failure.

[0051] Optionally, the first fault tree further includes a seventh undetected event, the seventh undetected event is connected to the sixth target bottom event through an OR gate and the sixth target intermediate event, and the seventh undetected event is an OBC self-check failure.

[0052] Optionally, the first fault tree further includes at least one of an eighth undetected event, a ninth undetected event, and a tenth undetected event, wherein the eighth undetected event, the ninth undetected event, and the tenth undetected event are all connected to the seventh target bottom event through an OR gate and the seventh target intermediate event; the eighth undetected event is a slow charge power-on waiting timeout, the ninth undetected event is that charging is not ready, and the tenth undetected event is an AC charging system failure.

[0053] Further, the first fault tree including undetected events is as Figure 5 shown, Figure 4 The fault tree in Figure 5 can be simplified from the fault tree in Figure 5 . For example, it can be obtained by deleting the undetected events in Figure 4 and merging the BMS software failures, and then obtaining the fault tree in

[0054] The determination method according to an embodiment of the present invention further includes: determining the probability of the occurrence of the target bottom event, and outputting the target bottom event and the probability corresponding to the target bottom event.

[0055] It should be noted that the probability of the occurrence of the target basic event can be obtained, for example, according to a pre-stored corresponding relationship table, where the probability of each target basic event is stored in the corresponding relationship table, and the corresponding relationship table can be obtained through multiple statistics.

[0056] By outputting the probability corresponding to the target basic event, the maintenance personnel can preferentially check the target basic events with high failure rates according to the different probabilities of the target basic events, which helps the maintenance personnel quickly locate and solve problems. Moreover, by eliminating the target basic event with the highest occurrence probability, the reliability of the system can be improved.

[0057] The determination method according to the embodiments of the present invention, according to Figure 4 , all the minimal cut sets of the top event (that is, the target basic events) can be obtained by using the Boolean method. Among them, the set of all minimal cut sets is represented by Z, then

[0058] Z = BMS + OBC + C + K1 + K2 + S2 + BMS + (OBC + BMS) + (B + BMS) + (C + S1 + E + S3)

[0059] = BMS + OBC + C + K1 + K2 + S2 + B + S1 + S3 + E

[0060] By obtaining all the minimal cut sets of the top event, the probability of the occurrence of the target basic event can be estimated, so as to obtain the probability of the occurrence of each target basic event.

[0061] Optionally, as shown in Table 1, the symbols corresponding to each target basic event and a possible probability are shown.

[0062] Target basic event Target basic event symbol Target basic event probability Battery management system BMS 0.267 On-board charger OBC 0.133 Power supply equipment C 0.133 Battery B 0.067 Electronic lock E 0.067 Contactor K1 K1 0.067 Contactor K2 K2 0.067 Relay switch S1 S1 0.067 Relay switch S2 S2 0.067 Relay switch S3 S3 0.067

[0063] Table 1

[0064] Next, refer to Figure 6 , which is another schematic flowchart of the determination method according to the embodiments of the present invention. Among them, the determination method includes the following steps:

[0065] Step 60: Start.

[0066] Step 61: The vehicle connects the charging gun, and a failure event of the start of the vehicle's AC charging occurs.

[0067] Step 62: Determine whether the current maximum allowable input current of the on-board charger is normal. If it is, execute Step 63; if not, determine that there is a BMS software fault. Optionally, Step 62 can also be: Determine whether a fault of the on-board charger is prompted. If it is, determine that there is a fault of the on-board charger; if not, execute Step 63. Among them, it is possible to judge whether the current maximum allowable input current of the OBC is normal through the Controller Area Network (CAN) message of the vehicle controller and determine whether the OBC has a fault through the prompt of the CAN message.

[0068] Step 63: Determine whether the charging pile prompts a fault. If it is, determine that there is a fault with the charging pile; if not, execute Step 64.

[0069] It should be noted that a fault of the charging pile, for example, can be that the contactor K1 fails to execute closing, or the contactor K2 fails to execute closing. Optionally, it can also be other faults different from K1 and K2.

[0070] Step 64: Determine whether a BMS software fault is prompted. If it is, determine that there is a BMS software fault; if not, execute Step 65.

[0071] It should be noted that it is possible to determine a BMS software fault through the vehicle CAN message. Optionally, a BMS software fault can be, for example, one or more of an AC charging system fault, charging not ready, slow charging power-on waiting timeout, and BMS hard wire not being awakened.

[0072] Step 65: Judge whether the battery state is abnormal. If it is, determine that there is a battery fault; if not, execute Step 66. Among them, it is possible to determine whether the battery state is abnormal through the vehicle CAN message.

[0073] Step 66: Determine whether the OBC prompts a fault. If it is, determine that there is a fault with the OBC or a BMS software fault; if not, execute Step 67.

[0074] It should be noted that it is possible to determine whether the OBC has related faults through the vehicle CAN message. Among them, related faults can be, for example, one or more of OBC self-check failure, BMS output OBC operation instruction error, and OBC communication fault.

[0075] Step 67: Judge whether the control instruction of the relay switch S2 is correct. If not, determine that there is a BMS software fault; if it is, execute Step 68.

[0076] It should be noted that the S2 control instruction includes one or both of the BMS control relay switch S2 closing instruction and the OBC execution relay switch S2 closing instruction.

[0077] Step 68: Determine whether the relay switch S2 is closed. If not, it is determined that the relay switch S2 is faulty. If so, proceed to Step 69. Among them, it can be determined whether the relay switch S2 is closed through the vehicle CAN message.

[0078] Step 69: Determine whether the voltage value at detection point 1 is normal. If not, it is determined that the charging pile is faulty. If so, proceed to Step 610. Among them, the position of detection point 1 is as Figure 1 shown.

[0079] Step 610: Determine whether the PWM signal at detection point 2 is normal. If not, it is determined that the charging pile is faulty or the relay switch S1 is faulty. If so, proceed to Step 611. Among them, the position of detection point 2 is as Figure 1 shown. It should be noted that it can be determined whether the PWM signal at detection point 2 is normal through the vehicle CAN message.

[0080] Step 611: Determine whether the electronic lock indicates a fault. If so, it is determined that the electronic lock is faulty. If not, proceed to Step 612. Among them, it can be determined whether the electronic lock reports a fault through the vehicle CAN message.

[0081] Step 612: Determine whether the resistance value at detection point 3 is normal. If not, it is determined that S3 is faulty. If so, proceed to Step 613. Among them, it can be determined whether the resistance value at detection point 3 is normal through the vehicle CAN message, and the position of detection point 3 is as Figure 1 shown.

[0082] Step 613: End.

[0083] Based on the same technical concept as the above determination method, next, refer to Figure 7 Another embodiment of the present invention provides a device for determining charging faults. The determination device achieves the same technical effect as the above determination method, and will not be elaborated here. The determination device includes: a determination module 71, configured to, in the case of a vehicle charging start failure event, analyze a first fault tree established in advance for causing the charging start failure by using the fault tree analysis method to obtain a target bottom event that causes the vehicle charging failure and a target intermediate event connected to the target bottom event, where the top event of the first fault tree is: after the vehicle is connected to the charging gun, the vehicle AC charging start fails; an output module 72, configured to output the target bottom event that causes the vehicle charging failure and the target intermediate event connected to the target bottom event.

[0084] The determination device according to an embodiment of the present invention, the target intermediate event includes: a first target intermediate event, and the first target intermediate event is: the setting of the maximum allowable input current of the on-vehicle charger fails; the target basic event includes: a first target basic event connected to the first target intermediate event through an OR gate, and the first target basic event includes: on-vehicle charger failure and battery management system failure.

[0085] The determination device according to an embodiment of the present invention, the target intermediate event further includes: a second target intermediate event, and the second target intermediate event is: the charging connection device is not fully connected, and the first target intermediate event and the second target intermediate event are connected through an OR gate; the target basic event further includes: a second target basic event connected to the second target intermediate event through an OR gate, and the second target basic event includes at least one of the following: the contactor K1 cannot be closed; the contactor K2 cannot be closed; power supply device failure.

[0086] The determination device according to an embodiment of the present invention, the target intermediate event further includes: a third target intermediate event, and the third target intermediate event is: the vehicle is not ready, and the third target intermediate event and the second target basic event are connected to the second target intermediate event through an OR gate; the target basic event further includes: a third target basic event connected to the third target intermediate event through an OR gate, and the third target basic event includes: the relay switch S2 cannot be closed and battery management system failure.

[0087] The determination device according to an embodiment of the present invention, the target intermediate event further includes: a fourth target intermediate event, and the fourth target intermediate event is that the charging connection device is not fully connected, and the fourth target intermediate event and the third target basic event are connected to the third target intermediate event through an OR gate; the target basic event further includes: a fourth target basic event connected to the fourth target intermediate event through an OR gate, and the fourth target basic event is: power supply device failure.

[0088] The determination device according to an embodiment of the present invention, the target intermediate event further includes: a fifth target intermediate event, and the fifth target intermediate event is that the relay switch S1 is not switched to pulse width modulation, and the fifth target intermediate event and the fourth target basic event are connected to the fourth target intermediate event through an OR gate; the target basic event further includes: a fifth target basic event connected to the fifth target intermediate event through an OR gate, and the fifth target basic event includes at least two of the following: relay switch S1 failure; electronic lock failure; relay switch S3 failure.

[0089] The determination device according to an embodiment of the present invention, the target intermediate event further includes: a sixth target intermediate event and / or a seventh target intermediate event, the sixth target intermediate event is: the on-vehicle charger is in a non-chargeable state, the seventh target intermediate event is: the battery pack is in a non-chargeable state, the sixth target intermediate event, the seventh target intermediate event, the fourth target intermediate event and the third target bottom event are connected to the third target intermediate event through an OR gate; the target bottom event further includes: a sixth target bottom event connected to the sixth target intermediate event through an OR gate and / or a seventh target bottom event connected to the seventh target intermediate event through an OR gate; the sixth target bottom event is: on-vehicle charger failure and battery management system failure; the seventh target bottom event is: battery failure and battery management system failure.

[0090] The determination device according to an embodiment of the present invention, the output module 72 is further configured to: determine the probability of occurrence of the target bottom event, and output the target bottom event and the probability corresponding to the target bottom event.

[0091] Another embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, the above-mentioned determination method is implemented.

[0092] In addition, the present invention may repeat reference numerals and / or letters in different examples. This repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or arrangements discussed.

[0093] It should also be noted that in this document, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variation thereof is intended to cover a non-exclusive inclusion.

[0094] The above is the preferred embodiment of the present invention. It should be pointed out that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements should also be regarded as the protection scope of the present invention.

Claims

1. A method for determining a charging fault, characterized in that, The determination method includes: In the case of a failure event of the vehicle AC charging start, the fault tree analysis method is used to analyze the first fault tree established in advance for the charging start failure, and the target bottom event that causes the vehicle charging failure and the target intermediate event connected to the target bottom event are obtained. Among them, the top event of the first fault tree is: after the vehicle connects the charging gun, the vehicle AC charging start fails; the target intermediate event is the direct cause of the occurrence of the top event; the target bottom event is the possible cause of the target intermediate event; Output the target bottom event that causes the vehicle AC charging failure and the target intermediate event connected to the target bottom event; Among them, the target intermediate event includes: the first target intermediate event, and the first target intermediate event is: the maximum allowable input current setting of the on-vehicle charger fails; The target bottom event includes: the first target bottom event connected to the first target intermediate event through an OR gate, and the first target bottom event includes: on-vehicle charger failure and battery management system failure.

2. The determination method according to claim 1, wherein The target intermediate event further includes: the second target intermediate event, and the second target intermediate event is: the charging connection device is not fully connected, and the first target intermediate event and the second target intermediate event are connected through an OR gate; The target bottom event further includes: the second target bottom event connected to the second target intermediate event through an OR gate, and the second target bottom event includes at least one of the following: Contactor K1 cannot be closed; Contactor K2 cannot be closed; Power supply device failure.

3. The determination method according to claim 2, characterized in that The target intermediate event further includes: the third target intermediate event, and the third target intermediate event is: the vehicle is not ready, and the third target intermediate event and the second target bottom event are connected to the second target intermediate event through an OR gate; The target bottom event further includes: the third target bottom event connected to the third target intermediate event through an OR gate, and the third target bottom event includes: relay switch S2 cannot be closed and battery management system failure.

4. The determination method according to claim 3, wherein The target intermediate event further includes: the fourth target intermediate event, and the fourth target intermediate event is that the charging connection device is not fully connected, and the fourth target intermediate event and the third target bottom event are connected to the third target intermediate event through an OR gate; The target bottom event further includes: the fourth target bottom event connected to the fourth target intermediate event through an OR gate, and the fourth target bottom event is: power supply device failure.

5. The determination method according to claim 4, characterized in that The target intermediate event further includes: The fifth target intermediate event, and the fifth target intermediate event is that the relay switch S1 is not switched to pulse width modulation, and the fifth target intermediate event and the fourth target bottom event are connected to the fourth target intermediate event through an OR gate; The target bottom event further includes: the fifth target bottom event connected to the fifth target intermediate event through an OR gate, and the fifth target bottom event includes at least two of the following: Relay switch S1 failure; Electronic lock failure; Relay switch S3 failure.

6. The determination method according to claim 4, characterized in that The target intermediate event further includes: The sixth target intermediate event and / or the seventh target intermediate event, where the sixth target intermediate event is: the on-vehicle charger is in a non-chargeable state, and the seventh target intermediate event is: the battery pack is in a non-chargeable state. The sixth target intermediate event, the seventh target intermediate event, the fourth target intermediate event, and the third target bottom event are connected to the third target intermediate event through an OR gate; The target bottom event further includes: a sixth target bottom event connected to the sixth target intermediate event through an OR gate and / or a seventh target bottom event connected to the seventh target intermediate event through an OR gate; The sixth target bottom event is: on-vehicle charger failure and battery management system failure; The seventh target bottom event is: battery failure and battery management system failure.

7. The determination method according to claim 1, wherein It further includes: Determine the probability of the occurrence of the target bottom event, and output the target bottom event and the probability corresponding to the target bottom event.

8. A determination device for charging faults, characterized in that, The determining device includes: A determining module, configured to, when a vehicle charging start failure event occurs, analyze a first fault tree established in advance for causing charging start failure by using a fault tree analysis method, to obtain a target bottom event that causes vehicle charging failure and a target intermediate event connected to the target bottom event. Wherein, the top event of the first fault tree is: after the vehicle is connected to the charging gun, the vehicle AC charging start fails; the target intermediate event is the direct cause of the occurrence of the top event; the target bottom event is the possible cause of the target intermediate event; An output module, configured to output the target bottom event that causes vehicle charging failure and the target intermediate event connected to the target bottom event; Wherein, the target intermediate event includes: a first target intermediate event, and the first target intermediate event is: the maximum allowable input current setting of the on-vehicle charger fails; The target bottom event includes: a first target bottom event connected to the first target intermediate event through an OR gate, and the first target bottom event includes: on-vehicle charger failure and battery management system failure.

9. A computer-readable storage medium, characterized in that, A computer program is stored on the computer-readable storage medium, and when the computer program is executed by a processor, the determining method according to any one of claims 1 to 7 is implemented.

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