Vehicle power-off protection method, electronic equipment and vehicle

Abstract

The invention provides a vehicle power-off protection method, electronic equipment and a vehicle, which are applied to the technical field of vehicle control, and the method comprises the following steps: monitoring the voltage change rate of the output end of a DC-DC converter in real time; responding to the condition that the voltage change rate meets the voltage change condition, and disconnecting a relay in the DC-DC converter; wherein the voltage change condition is a critical condition with an electric shock risk. According to the invention, the time from collision to power failure of all related high-voltage components can be shortened, so that passengers are more effectively protected from the risk of electric shock.

Description

Technical Field

[0001] This application relates to the technical field of vehicle control, and particularly to a vehicle power-off protection method, an electronic device, and a vehicle. Background Art

[0002] In the high-voltage electrical system of a fuel cell vehicle, in the event of an emergency such as a vehicle collision, if the high-voltage electrical system cannot be quickly disconnected, there may be a risk of electric leakage due to damage to high-voltage components or protective casings, thus posing a serious electric shock risk to the vehicle occupants. Summary of the Invention

[0003] In view of this, the purpose of this application is to propose a vehicle power-off protection method, an electronic device, and a vehicle to quickly disconnect the vehicle battery and avoid serious electric shock risks to vehicle occupants.

[0004] Based on the above purpose, this application provides a vehicle power-off protection method, including:

[0005] Real-time monitoring of the voltage change rate at the output end of the DC-DC converter;

[0006] In response to the voltage change rate meeting the voltage change condition, disconnect the relay inside the DC-DC converter; wherein, the voltage change condition is a critical condition for the existence of an electric shock risk.

[0007] Based on the same inventive concept, this application also provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable by the processor. When the processor executes the computer program, it implements the method described above.

[0008] Based on the same inventive concept, this application also provides a vehicle, which includes the above-mentioned electronic device.

[0009] As can be seen from the above, this application provides a vehicle power-off protection method, an electronic device, and a vehicle. The method includes: real-time monitoring of the voltage change rate at the output end of the DC-DC converter; when the voltage change rate meets the voltage change condition, disconnect the relay inside the DC-DC converter. For example, when the voltage change rate is greater than or equal to the first preset voltage change rate, quickly disconnect the relay inside the DC-DC converter, thereby effectively disconnecting the fuel cell to reduce the risk of electric leakage or electric shock, protecting the safety of passengers, and effectively improving the safety and reliability of the vehicle in the event of a collision or the like. Brief Description of the Drawings

[0010] To more clearly illustrate the technical solutions in this application or related technologies, the following will briefly introduce the accompanying drawings required for use in the embodiments or related technology descriptions. Obviously, the accompanying drawings in the following descriptions are only the embodiments of this application. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can also be obtained based on these drawings.

[0011] Figure 1 It is a schematic flowchart of the vehicle power-off protection method according to an embodiment of this application;

[0012] Figure 2 It is a schematic flowchart of the vehicle power-off protection method according to another embodiment of this application;

[0013] Figure 3 It is a schematic circuit diagram of the vehicle power-off protection circuit according to an embodiment of this application;

[0014] Figure 4 It is a schematic diagram of the vehicle power-off protection device according to an embodiment of this application;

[0015] Figure 5 It is a schematic diagram of the hardware structure of an electronic device provided by an embodiment of this application;

[0016] Reference numerals: 1, fuel cell; 2, DC-DC converter; 3, high-voltage harness; 4, high-voltage load; 5, relay; 6, pyrotechnic power-off safety protection switch; 7, power battery. Detailed implementation manners

[0017] To make the objectives, technical solutions, and advantages of this application clearer and more understandable, the following further elaborates on this application in detail with reference to specific embodiments and the accompanying drawings.

[0018] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the embodiments of this application should have the ordinary meaning understood by those with ordinary skills in the field to which this application belongs. The "first", "second", and similar terms used in the embodiments of this application do not indicate any order, quantity, or importance, but are only used to distinguish different components. The terms such as "include" or "comprise" mean that the elements or objects appearing before this term cover the elements or objects listed after this term and their equivalents, without excluding other elements or objects. The terms such as "connect" or "be connected" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right", etc. are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.

[0019] In the related art, a hydrogen fuel cell vehicle generates electrical energy through an electrochemical reaction between hydrogen and oxygen in the air in a fuel cell. The electrical energy is converted by a DC-DC converter and then output to the high-voltage harness of the whole vehicle, and then output to various high-voltage loads of the vehicle, such as a power battery, a drive motor, an air-conditioning compressor, etc. However, there are safety risks in the high-voltage electrical system in case of emergencies such as vehicle collisions. The collision may cause damage to high-voltage components or protective casings. If the high-voltage circuit fails to be disconnected in time at this time, the exposed high-voltage part will pose an electric shock risk to personnel. Therefore, ensuring the rapid disconnection of the high-voltage circuit in case of a collision to prevent electrical injuries is an important part of the design.

[0020] In the related art, as Figure 3 shown in the vehicle power-off protection circuit, it includes a DC-DC converter 2 provided on one side of the fuel cell 1. The input end of the DC-DC converter 2 is connected to the fuel cell 1, and the output end of the DC-DC converter 2 is connected to the high-voltage load 4 through a high-voltage harness 3. A relay 5 is provided inside the DC-DC converter 2. The output end of the DC-DC converter 2 is also connected to a pyrotechnic power-off safety protection switch 6 through the high-voltage harness 3, and the pyrotechnic power-off safety protection switch 6 is connected to the power battery 7.

[0021] It should be noted that the pyrotechnic power-off safety protection switch 6 can quickly disconnect the connection between the power battery 7 and the high-voltage harness 3 after receiving a collision signal. In addition, the DC-DC converter 2 on one side of the fuel cell 1 controls the relay 5 to disconnect the connection between the fuel cell 1 and the high-voltage harness 3 by receiving a collision signal. However, the transmission and processing of the collision signal require a long time (hundreds of milliseconds), which may not be sufficient to prevent the electric shock risk in an emergency. If the pyrotechnic power-off safety protection switch 6 is integrated inside the DC-DC converter 2, since the DC-DC converter 2 is close to the fuel cell 1, there may be a small amount of hydrogen permeating from the fuel cell 1 inside the DC-DC converter 2, and there is a risk of igniting the hydrogen when the gunpowder in the pyrotechnic power-off safety protection switch 6 explodes.

[0022] Based on the above problems, the applicant found that: by real-time monitoring the voltage change rate at the output end of the DC-DC converter; when the voltage change rate meets the voltage change condition, disconnect the relay inside the DC-DC converter, so as to quickly cut off the connection between the fuel cell and the high-voltage circuit of the whole vehicle, which can reduce the time from the occurrence of the collision to the power-off of all relevant high-voltage components, thus more effectively protecting the occupants from the risk of electric shock and protecting the safety of passengers and maintenance personnel. When the voltage change rate reaches the critical condition of the electric shock risk, the disconnection of the relay can prevent the high-voltage current from further flowing to other electrical systems of the vehicle, thus protecting these systems from high-voltage damage.

[0023] The following will describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0024] The present application provides a vehicle power-off protection method. As Figure 1 shown, in some embodiments, this method is executed by a vehicle controller or a data processor set independently of the vehicle controller. In the following embodiments, the data processor is taken as an example for illustration. The vehicle includes a DC-DC converter disposed on one side of a fuel cell. The input end of the DC-DC converter is connected to the fuel cell, and the output end of the DC-DC converter is connected to a high-voltage load through a high-voltage harness. A relay is disposed inside the DC-DC converter;

[0025] The vehicle power-off protection method includes:

[0026] S101. Real-time monitor the voltage change rate at the output end of the DC-DC converter;

[0027] Specifically, when implemented, the voltage change rate at the output end of the DC-DC converter refers to the speed at which the voltage changes with time. By continuously monitoring the voltage change rate, abnormal changes that may occur in the circuit, such as short circuits, open circuits, or other situations that cause voltage mutations, can be detected. The voltage change rate can be obtained by calculating the difference between two consecutive voltage measurement values and dividing it by the time interval.

[0028] S102. In response to the voltage change rate meeting the voltage change condition, disconnect the relay inside the DC-DC converter; wherein, the voltage change condition is a critical condition for the existence of an electric shock risk.

[0029] Specifically, when implemented, the voltage change condition is a critical condition for the existence of an electric shock risk, which can be a preset voltage change rate threshold for determining when the vehicle may be in a state where there is a risk of collision and an electric shock risk for the passengers inside the vehicle. The relay inside the DC-DC converter serves to safely disconnect the connection between the fuel cell and the vehicle's high-voltage circuit. When the voltage change rate meets the voltage change condition (i.e., when the vehicle collides and the pyrotechnic power-off safety protection switch quickly disconnects the connection between the power battery and the vehicle's high-voltage circuit, at this time, a voltage mutation occurs in the line where the output end of the DC-DC converter is located, and the voltage change rate meets the critical condition, such as the voltage change rate is greater than or equal to the first preset voltage change rate), the relay is disconnected to quickly disconnect the connection between the fuel cell and the vehicle's high-voltage circuit when a potential electric shock risk is detected, avoiding the electric shock risk caused by high-voltage components to personnel, effectively protecting the safety of the passengers inside the vehicle, and at the same time protecting the electrical equipment from damage, ensuring a high level of safety during the operation of the vehicle.

[0030] In this embodiment, by monitoring the voltage change rate in real time, abnormal voltage changes caused by vehicle collisions or other faults can be quickly detected. When it is detected that the voltage change rate reaches the critical condition of electric shock risk, the relay is disconnected, thereby quickly cutting off the connection between the fuel cell and the vehicle's high-voltage circuit, greatly reducing the risk of electric shock during a vehicle collision and protecting the safety of passengers and maintenance personnel. When the voltage change rate reaches the critical condition of electric shock risk, the disconnection of the relay can prevent high-voltage current from further flowing to other electrical systems of the vehicle, thereby protecting these systems from high-voltage damage. Compared with integrating a pyrotechnic power-off safety protection switch inside the DC-DC converter to disconnect the fuel cell, this embodiment can ensure the quick disconnection of the fuel cell while avoiding the risk of the hydrogen in the fuel cell being ignited when the gunpowder in the pyrotechnic power-off safety protection switch explodes.

[0031] Based on the following embodiments, a detailed description will be given on how to disconnect the relay inside the DC-DC converter when the voltage change rate meets the voltage change condition.

[0032] In some embodiments, the disconnecting of the relay inside the DC-DC converter in response to the voltage change rate meeting the voltage change condition includes:

[0033] In response to the voltage change rate being greater than or equal to a first preset voltage change rate, the relay inside the DC-DC converter is disconnected.

[0034] Specifically, the voltage change rate refers to the speed at which the voltage changes with time. When the voltage change rate is greater than or equal to the first preset voltage change rate (exemplarily, the first preset voltage change rate is 2.8 V / ms, that is, it changes 42 V within 15 ms), it indicates that there is a load dump generated by the pyrotechnic power-off safety protection switch disconnecting the power battery from the vehicle's high-voltage circuit in the line where the output terminal of the DC-DC converter is located, then the vehicle may have a collision. Therefore, the relay inside the DC-DC converter is disconnected to avoid the risk of electric leakage.

[0035] In this embodiment, by setting the first preset voltage change rate, a reaction can be immediately made when the voltage change rate is greater than or equal to the first preset voltage change rate, and the relay inside the DC-DC converter is disconnected. That is, when a vehicle collision occurs, the power battery and the vehicle's high-voltage circuit may be quickly disconnected. At this time, by disconnecting the relay inside the DC-DC converter, the fuel cell can be effectively disconnected, reducing the risk of electric leakage or electric shock and protecting the safety of passengers. The safety and reliability of the vehicle in emergency situations such as collisions can be effectively improved. Compared with the conventional method of triggering the relay to disconnect through a vehicle collision signal, which takes hundreds of milliseconds, this embodiment can achieve triggering the relay to disconnect within dozens of milliseconds.

[0036] The following embodiments will be used to elaborate in detail on how to disconnect the relay inside the DC-DC converter by meeting the voltage change condition with the voltage change rate.

[0037] In some embodiments, as Figure 2 shown, disconnecting the relay inside the DC-DC converter in response to the voltage change rate meeting the voltage change condition includes:

[0038] S201. In response to the voltage change rate being greater than or equal to the second preset voltage change rate and less than the first preset voltage change rate, continuously monitor the voltage peak-to-peak value at the output end of the DC-DC converter;

[0039] In specific implementation, when the voltage change rate is greater than or equal to the second preset voltage change rate (exemplarily, the second preset voltage change rate is set to 2V / ms) and less than the first preset voltage change rate, it indicates that the voltage change rate has not reached the critical condition but is very close to it. To ensure the safety of passengers in the vehicle and avoid misjudgment in the case where the vehicle may collide but the voltage change rate is close to the critical condition, resulting in the inability to disconnect the fuel cell in time and posing a risk of electric shock to passengers in the vehicle, further monitor the voltage peak-to-peak value at the output end of the DC-DC converter to reduce the probability of misjudgment and improve the accuracy of judging the vehicle collision risk.

[0040] S202. In response to the voltage peak-to-peak value being greater than or equal to the preset voltage peak-to-peak value, disconnect the relay inside the DC-DC converter.

[0041] In specific implementation, the voltage peak-to-peak value is one of the key indicators for measuring voltage stability. The voltage peak-to-peak value refers to the maximum range of voltage fluctuation within a certain time period, that is, the difference between the lowest point and the highest point. When the voltage peak-to-peak value is greater than or equal to the preset voltage peak-to-peak value (exemplarily, the preset voltage peak-to-peak value is set to 1V), it indicates that there is abnormal voltage fluctuation in the circuit where the output end of the DC-DC converter is located, which may be caused by the pyrotechnic power-off safety protection switch disconnecting the connection between the power battery and the vehicle's high-voltage circuit. Therefore, disconnect the relay inside the DC-DC converter to avoid the risk of electric shock to personnel caused by high-voltage components, effectively protect the safety of passengers in the vehicle, and at the same time protect electrical equipment from damage, ensuring the high safety of the vehicle during operation.

[0042] In this embodiment, by monitoring the voltage change rate and the peak-to-peak voltage, it is possible to more accurately determine whether there is an abnormal situation in the circuit, such as the disconnection of the power battery from the vehicle's high-voltage circuit due to a vehicle collision. It is ensured that when the voltage change rate can characterize a potential problem but does not reach the second preset voltage change rate, an abnormal peak-to-peak voltage can still be used to respond, thereby avoiding misjudgment, timely disconnecting the fuel cell, avoiding the risk of electric shock, and enhancing the safety of the vehicle during operation and collision.

[0043] Based on the following embodiments, the situation after receiving a vehicle safety signal or a vehicle collision signal after disconnecting the relay inside the DC-DC converter is described to achieve further control of the vehicle.

[0044] In some embodiments, after disconnecting the relay inside the DC-DC converter, it further includes:

[0045] In response to receiving a vehicle safety signal, closing the relay inside the DC-DC converter;

[0046] Specifically, when a vehicle safety signal is received after disconnecting the relay inside the DC-DC converter, it indicates a misjudgment of a vehicle collision event. At this time, the relay is closed to reconnect the circuit and restore power supply to ensure that normal operation can continue after confirming the safety of the vehicle.

[0047] In response to receiving a vehicle collision signal, controlling the vehicle to power off under high voltage.

[0048] Specifically, when a vehicle collision signal is received, it indicates that the vehicle has indeed collided. To ensure the safety of the vehicle and the passengers inside, the vehicle is controlled to power off under high voltage to avoid the risk of electric shock to personnel caused by leakage of the fuel cell and the power battery, and at the same time protect the electrical equipment from damage.

[0049] In this embodiment, by quickly closing the relay inside the DC-DC converter to restore power supply in case of misjudgment, it is ensured that the vehicle can quickly resume normal operation after confirming safety. In the event of a real vehicle collision, power can be cut off immediately to reduce potential hazards after the accident, such as electric shock to passengers inside the vehicle, electrical fires, or further equipment damage.

[0050] Based on the following embodiments, how to determine the vehicle fault that causes misjudgment after receiving a vehicle safety signal is described in detail.

[0051] In some embodiments, after receiving a vehicle safety signal, it further includes:

[0052] Obtaining the number of times the target vehicle safety signal is received within the historical first preset duration, where the target vehicle safety signal is the vehicle safety signal received when the relay is disconnected under the condition that the fuel cell is working.

[0053] In specific implementation, the target vehicle safety signal refers to the vehicle safety signal received after the relay is disconnected due to a misjudgment of a vehicle collision when the fuel cell is working. Therefore, counting the number of times the target vehicle safety signal is received within the first preset duration in history (exemplarily, the first preset duration is set to 1 month) can obtain the number of misjudged vehicle collisions within the first preset duration in history. The number of misjudged vehicle collisions within the first preset duration in history can indirectly determine whether there is a fault in the components inside the vehicle. Because if there is a fault in the components inside the vehicle, it may cause a ripple voltage in the high-voltage circuit of the whole vehicle, resulting in a misjudgment of the voltage at the output end of the DC-DC converter, thus leading to a misjudgment of a vehicle collision.

[0054] In response to the number being greater than or equal to the preset number, a vehicle fault prompt message is sent to the user.

[0055] In specific implementation, when the number is greater than or equal to the preset number (exemplarily, the preset number is set to 3 times), it indicates that the vehicle has frequent misjudgments in the past month, and it can be determined that there is a fault in the components inside the vehicle. Therefore, a vehicle fault prompt message is sent to the user to prompt the user to perform maintenance on the vehicle in a timely manner.

[0056] In this embodiment, the target vehicle safety signal refers to the vehicle safety signal received after the relay is disconnected due to a misjudgment of a vehicle collision in the fuel cell working state. Counting the number of times the target vehicle safety signal is received within the first preset duration in history can obtain the number of misjudged vehicle collisions within the first preset duration in history, so as to detect potential faults in vehicle components that may cause misjudgments at an early stage, and thus perform repairs or adjustments in advance to avoid more serious vehicle accidents caused by these problems. At the same time, timely fault detection and repair can maintain the good operating state of the vehicle and extend the overall service life of the vehicle.

[0057] Based on the following embodiments, how to adjust the first preset voltage change rate to avoid frequent misjudgments will be described in detail.

[0058] In some embodiments, after sending the vehicle fault prompt message to the user, it further includes:

[0059] Determine a first adjustment coefficient for adjusting the first preset voltage change rate according to the number, and use the product of the first adjustment coefficient and the first preset voltage change rate as the adjusted first preset voltage change rate;

[0060] Wherein, the first adjustment coefficient is proportional to the number.

[0061] During specific implementation, after sending a vehicle fault prompt message to the user, determine a first adjustment coefficient for adjusting the first preset voltage change rate based on the number of target vehicle safety signals received within a historical first preset duration, and use the product of the first adjustment coefficient and the first preset voltage change rate as the adjusted first preset voltage change rate, thereby increasing the first preset voltage change rate; since it is determined that the vehicle frequently makes misjudgments within the historical first preset duration, a vehicle fault prompt message is sent to the user. However, during the process of the user driving the vehicle to the repair shop, if a misjudgment occurs again and causes the relay inside the DC / DC converter to disconnect, resulting in the disconnection of the fuel cell from the vehicle's high-voltage circuit, it will increase the driving risk of the vehicle. Therefore, appropriately increasing the first preset voltage change rate can avoid frequent misjudgments and ensure the safety of the vehicle.

[0062] Specifically, the first adjustment coefficient can be set to where Z1 represents the first adjustment coefficient, P represents the number of times, P0 represents the preset number of times (exemplarily, the preset number of times is set to 3 times), and e represents the natural constant.

[0063] Based on the relationship between the number of target vehicle safety signals received within the historical first preset duration and the preset number of times, calculate the first adjustment coefficient to moderately increase the first preset voltage change rate, avoiding the situation where the adjusted first preset voltage change rate is too large and the vehicle's collision risk cannot be judged at all.

[0064] In this embodiment, by increasing the first preset voltage change rate, the situation where voltage changes not related to collisions are misjudged as collisions is reduced, avoiding unnecessary disconnection of the fuel cell from the vehicle's high-voltage circuit due to misjudgments, thereby improving the continuity and stability of vehicle operation. Ensure that the vehicle will not suddenly lose power due to misjudgments during driving, protecting the safety of the vehicle and its occupants. At the same time, determine the first adjustment coefficient based on the relationship between the number of target vehicle safety signals received within the historical first preset duration (i.e., the number of times the vehicle is misjudged to have a collision accident) and the preset number of times, so as to accurately increase the first preset voltage change rate and avoid the situation where the first preset voltage change rate is too large and the vehicle's collision accident cannot be judged at all.

[0065] Based on the following embodiments, a detailed description will be given on how to determine the vehicle faults causing misjudgments after receiving vehicle safety signals.

[0066] In some embodiments, after receiving the vehicle safety signal, it further includes:

[0067] Obtain a plurality of voltage peak-to-peak values at the output end of the DC / DC converter within a second preset duration, and calculate the variance of the plurality of voltage peak-to-peak values;

[0068] During specific implementation, within the second preset duration (exemplarily, the second preset duration is set to 10S), several peak-to-peak voltages at the output end of the DC-DC converter are obtained, and the variance of the several peak-to-peak voltages is calculated to help identify the stability of the peak-to-peak voltages. The larger the variance, the greater the fluctuation of the peak-to-peak voltages, thereby indirectly determining whether there is a fault in the components within the vehicle. Because if there is a fault in the components within the vehicle, it may cause ripple voltage in the vehicle's high-voltage circuit, resulting in a relatively large fluctuation in the peak-to-peak voltages at the output end of the DC-DC converter.

[0069] In response to the variance being greater than or equal to the preset variance, a vehicle fault prompt message is sent to the user.

[0070] During specific implementation, when the variance is greater than or equal to the preset variance (exemplarily, the preset variance is set to 0.25V 2 ), it indicates that the peak-to-peak voltages at the output end of the DC-DC converter fluctuate greatly. It may be that there is a fault in the components within the vehicle, resulting in a large ripple voltage in the vehicle's high-voltage circuit, thus causing a misjudgment that the vehicle has collided. Therefore, a vehicle fault prompt message is sent to the user to prompt the user to perform vehicle maintenance in a timely manner.

[0071] In this embodiment, by monitoring the variance of the peak-to-peak voltages, the abnormal conditions of the components inside the vehicle are indirectly detected. A larger variance usually means that the peak-to-peak voltages are unstable, which may be due to faults in some components inside the vehicle, such as power batteries, motors, or power electronic devices. Discovering these problems in a timely manner and repairing the vehicle can avoid misjudging that the vehicle has collided and the occurrence of more serious vehicle damage or faults; ensuring the safe driving of the vehicle on the road.

[0072] Based on the following embodiments, how to adjust the first preset voltage change rate to avoid frequent misjudgments will be described in detail.

[0073] In some embodiments, after sending the vehicle fault prompt message to the user, it further includes:

[0074] Determine a second adjustment coefficient for adjusting the first preset voltage change rate according to the variance, and use the product of the second adjustment coefficient and the first preset voltage change rate as the adjusted first preset voltage change rate;

[0075] Wherein, the second adjustment coefficient is proportional to the variance.

[0076] During specific implementation, after sending a vehicle fault prompt message to the user, a second adjustment coefficient for adjusting the first preset voltage change rate is determined according to the variance obtained from several voltage peak-to-peak values at the output end of the DC-DC converter within a second preset duration, and the product of the second adjustment coefficient and the first preset voltage change rate is used as the adjusted first preset voltage change rate, thereby increasing the first preset voltage change rate; due to a fault in a component within the vehicle, there is a large ripple voltage in the vehicle's high-voltage circuit, which may lead to a misjudgment that the vehicle has collided. Therefore, a vehicle fault prompt message is sent to the user to prompt the user to repair the vehicle in a timely manner. However, during the process of driving the vehicle to a repair shop, if a misjudgment occurs again and the relay inside the DC-DC converter is disconnected, resulting in the disconnection of the fuel cell from the vehicle's high-voltage circuit, it will increase the driving risk of the vehicle. Therefore, appropriately increasing the first preset voltage change rate can avoid frequent misjudgments and ensure the safety of the vehicle.

[0077] Specifically, the second adjustment coefficient can be set to where Z2 represents the second adjustment coefficient, F represents the variance, F0 represents the preset variance (exemplarily, the preset variance is set to 0.25V 2 ), and e represents the natural constant.

[0078] Based on the relationship between the variance obtained from several voltage peak-to-peak values at the output end of the DC-DC converter within the second preset duration and the preset variance, the second adjustment coefficient is calculated to moderately increase the first preset voltage change rate, avoiding the situation where the adjusted first preset voltage change rate is too large and making it completely impossible to judge even when the vehicle has a collision risk.

[0079] In this embodiment, when there is a potential fault in the vehicle, it may lead to a misjudgment that the vehicle has collided. By increasing the first preset voltage change rate, misjudgments caused by voltage fluctuations can be reduced, thereby avoiding unnecessary vehicle emergency responses (such as disconnecting the relay, resulting in the disconnection of the fuel cell from the high-voltage circuit), and improving the continuity and stability of vehicle operation. Ensure that the vehicle will not suddenly lose power due to misjudgment during driving, protecting the safety of the vehicle and its occupants.

[0080] It should be noted that the method of this embodiment of the present application can be executed by a single device, such as a computer or a server. The method of this embodiment can also be applied to a distributed scenario and completed by multiple devices cooperating with each other. In this distributed scenario, one of these multiple devices can only execute one or more steps of the method of this embodiment of the present application, and these multiple devices will interact with each other to complete the described method.

[0081] It should be noted that some embodiments of the present application have been described above. Other embodiments are within the scope of the appended claims. In some cases, the actions or steps recited in the claims can be performed in a different order than in the above embodiments and still achieve the desired results. Additionally, the processes depicted in the drawings do not necessarily require the specific order or sequential order shown to achieve the desired results. In certain embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0082] Based on the same inventive concept, corresponding to any of the above-described method embodiments, the present application further provides a vehicle power-off protection device.

[0083] Referring to Figure 4 , the vehicle power-off protection device includes:

[0084] A monitoring module 701 configured to monitor in real time the voltage change rate at the output terminal of the DC-DC converter;

[0085] A judgment module 702 configured to disconnect the relay inside the DC-DC converter in response to the voltage change rate meeting the voltage change condition; wherein, the voltage change condition is a critical condition for the existence of an electric shock risk.

[0086] Further, the judgment module 702 is specifically configured to:

[0087] Disconnect the relay inside the DC-DC converter in response to the voltage change rate being greater than or equal to a first preset voltage change rate.

[0088] Further, the judgment module 702 is specifically further configured to:

[0089] Monitor in real time the voltage peak-to-peak value at the output terminal of the DC-DC converter in response to the voltage change rate being greater than or equal to a second preset voltage change rate and less than the first preset voltage change rate;

[0090] Disconnect the relay inside the DC-DC converter in response to the voltage peak-to-peak value being greater than or equal to a preset voltage peak-to-peak value.

[0091] Further, the judgment module 702 is specifically further configured to:

[0092] Close the relay inside the DC-DC converter in response to receiving a vehicle safety signal;

[0093] Control the vehicle to cut off high-voltage power in response to receiving a vehicle collision signal.

[0094] Further, the judgment module 702 is specifically further configured to:

[0095] Obtain the number of times the target vehicle safety signal is received within the first preset duration, where the target vehicle safety signal is the vehicle safety signal received when the relay is disconnected under the condition that the fuel cell is working;

[0096] In response to the number being greater than or equal to the preset number, send a vehicle fault prompt message to the user.

[0097] Furthermore, the determination module 702 is specifically further configured to:

[0098] Determine a first adjustment coefficient for adjusting the first preset voltage change rate according to the number, and use the product of the first adjustment coefficient and the first preset voltage change rate as the adjusted first preset voltage change rate;

[0099] Wherein, the first adjustment coefficient is proportional to the number.

[0100] Furthermore, the determination module 702 is specifically further configured to:

[0101] Obtain a plurality of voltage peak-to-peak values at the output end of the DC-DC converter within the second preset duration, and calculate the variance of the plurality of voltage peak-to-peak values;

[0102] In response to the variance being greater than or equal to the preset variance, send a vehicle fault prompt message to the user.

[0103] Furthermore, the determination module 702 is specifically further configured to:

[0104] Determine a second adjustment coefficient for adjusting the first preset voltage change rate according to the variance, and use the product of the second adjustment coefficient and the first preset voltage change rate as the adjusted first preset voltage change rate;

[0105] Wherein, the second adjustment coefficient is proportional to the variance.

[0106] For the convenience of description, when describing the above device, it is divided into various modules according to functions and described separately. Of course, when implementing the present application, the functions of each module can be implemented in the same or multiple software and / or hardware.

[0107] The device in the above embodiment is used to implement the corresponding vehicle power-off protection method in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be elaborated here.

[0108] Based on the same inventive concept, corresponding to the method in any of the above embodiments, the present application further provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor, and when the processor executes the program, it implements the vehicle power-off protection method described in any of the above embodiments.

[0109] Figure 5Fig. shows a more specific schematic diagram of the hardware structure of the electronic device provided in this embodiment. The device may include: a processor 1010, a memory 1020, an input / output interface 1030, a communication interface 1040, and a bus 1050. Among them, the processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040 are communicatively connected to each other inside the device through the bus 1050.

[0110] The processor 1010 may be implemented in the form of a general-purpose CPU (Central Processing Unit), a microprocessor, an application-specific integrated circuit (ASIC), or one or more integrated circuits, etc., and is used to execute relevant programs to implement the technical solutions provided in the embodiments of this specification.

[0111] The memory 1020 may be implemented in the form of a ROM (Read Only Memory), a RAM (Random Access Memory), a static storage device, a dynamic storage device, etc. The memory 1020 may store an operating system and other application programs. When implementing the technical solutions provided in the embodiments of this specification through software or firmware, the relevant program codes are stored in the memory 1020 and are called and executed by the processor 1010.

[0112] The input / output interface 1030 is used to connect to an input / output module to implement information input and output. The input / output module may be configured as a component in the device (not shown in the figure) or externally connected to the device to provide corresponding functions. Among them, the input device may include a keyboard, a mouse, a touch screen, a microphone, various sensors, etc., and the output device may include a display, a speaker, a vibrator, an indicator light, etc.

[0113] The communication interface 1040 is used to connect to a communication module (not shown in the figure) to implement communication interaction between this device and other devices. Among them, the communication module may implement communication in a wired manner (such as USB, network cable, etc.) or in a wireless manner (such as mobile network, WIFI, Bluetooth, etc.).

[0114] The bus 1050 includes a path for transmitting information between various components of the device (such as the processor 1010, the memory 1020, the input / output interface 1030, and the communication interface 1040).

[0115] It should be noted that although the above device only shows the processor 1010, the memory 1020, the input / output interface 1030, the communication interface 1040, and the bus 1050, in the specific implementation process, the device may also include other components necessary for normal operation. In addition, those skilled in the art can understand that the above device may also only include the components necessary to implement the solution of the embodiments of this specification, and does not necessarily include all the components shown in the figure.

[0116] The electronic device of the above embodiment is used to implement the corresponding vehicle power-off protection method in any of the foregoing embodiments, and has the beneficial effects of the corresponding method embodiments, which will not be elaborated here.

[0117] Based on the same inventive concept, corresponding to the method of any of the above embodiments, the present application also provides a non-transitory computer-readable storage medium storing computer instructions for causing the computer to execute the vehicle power-off protection method described in any of the foregoing embodiments.

[0118] The computer-readable medium of this embodiment includes permanent and non-permanent, removable and non-removable media, and information storage can be implemented by any method or technology. The information can be computer-readable instructions, data structures, program modules, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technologies, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassette tapes, magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information accessible by a computing device.

[0119] The computer instructions stored in the storage medium of the above embodiment are used to cause the computer to execute the vehicle power-off protection method described in any of the foregoing embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be elaborated here.

[0120] Based on the same concept, corresponding to the method of any of the above embodiments, the present application also provides a computer program product including computer program instructions, which when run on a computer, cause the computer to execute the method described in any of the foregoing embodiments, and have the beneficial effects of the corresponding method embodiments, which will not be elaborated here.

[0121] It is understandable that before using the technical solutions of the various embodiments of the present disclosure, the types, usage scopes, usage scenarios, etc. of the personal information involved will be informed to the user in an appropriate manner, and the user's authorization will be obtained.

[0122] For example, when responding to receiving an active request from the user, a prompt message is sent to the user to clearly prompt the user that the operation requested by the user will require obtaining and using the user's personal information. Thus, the user can autonomously choose whether to provide personal information to software or hardware such as an electronic device, an application program, a server, or a storage medium that performs the operations of the technical solutions of the present disclosure according to the prompt message.

[0123] As an optional but non-limiting implementation manner, the manner of sending a prompt message to the user in response to receiving an active request from the user can be, for example, in the form of a pop-up window. The prompt message can be presented in text in the pop-up window. In addition, the pop-up window can also carry a selection control for the user to choose "agree" or "disagree" to provide personal information to the electronic device.

[0124] It is understandable that the above process of notifying and obtaining the user's authorization is only illustrative and does not constitute a limitation on the implementation manner of the present disclosure. Other manners that comply with relevant laws and regulations can also be applied to the implementation manner of the present disclosure.

[0125] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present application is limited to these examples; under the idea of the present application, the technical features between the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other variations in different aspects of the embodiments of the present application as described above. For the sake of brevity, they are not provided in detail.

[0126] In addition, for the sake of simplicity of description and discussion, and in order not to make the embodiments of the present application difficult to understand, the well-known power / ground connections to integrated circuit (IC) chips and other components may or may not be shown in the provided drawings. In addition, the device can be shown in the form of a block diagram to avoid making the embodiments of the present application difficult to understand, and this also takes into account the fact that the details of the implementation manner of these block diagram devices are highly dependent on the platform on which the embodiments of the present application will be implemented (that is, these details should be completely within the understanding scope of those skilled in the art). In the case where specific details (such as circuits) are set forth to describe the exemplary embodiments of the present application, it is obvious to those skilled in the art that the embodiments of the present application can be implemented without these specific details or with changes to these specific details. Therefore, these descriptions should be considered illustrative rather than restrictive.

[0127] Although the present application has been described in connection with specific embodiments thereof, many alternatives, modifications, and variations of these embodiments will be apparent to those of ordinary skill in the art in light of the foregoing description. For example, other memory architectures (e.g., dynamic RAM (DRAM)) may be used with the embodiments discussed.

[0128] Embodiments of the present application are intended to cover all such alternatives, modifications, and variations that fall within the broad scope of the present application. Accordingly, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the embodiments of the present application shall be included within the protection scope of the present application.

Claims

1. A vehicle power-off protection method, characterized in that: The vehicle includes a DC-DC converter disposed on one side of a fuel cell, an input end of the DC-DC converter is connected to the fuel cell, an output end of the DC-DC converter is connected to a high-voltage load via a high-voltage wiring harness, and a relay is disposed inside the DC-DC converter; the method includes: Real-time monitoring of the voltage change rate at the output of the DC-DC converter; In response to the voltage change rate meeting a voltage change condition, disconnecting a relay inside the DC-DC converter; wherein the voltage change condition is a critical condition that causes a risk of electric shock.

2. The vehicle power-off protection method according to claim 1, characterized in that: In response to the voltage change rate meeting the voltage change condition, disconnecting the relay inside the DC-DC converter comprises: In response to the voltage change rate being greater than or equal to a first preset voltage change rate, disconnecting a relay inside the DC-DC converter.

3. The vehicle power-off protection method according to claim 1, characterized in that: In response to the voltage change rate meeting the voltage change condition, disconnecting the relay inside the DC-DC converter comprises: In response to the voltage change rate being greater than or equal to a second preset voltage change rate and less than the first preset voltage change rate, real-time monitoring of the peak-to-peak value of the voltage at the output end of the DC-DC converter; In response to the peak-to-peak value of the voltage being greater than or equal to the preset peak-to-peak value of the voltage, a relay inside the DC-to-DC converter is disconnected.

4. The vehicle power-off protection method according to claim 2 or 3, characterized in that: After disconnecting the relay inside the DC-DC converter, it also includes: In response to receiving a vehicle safety signal, closing a relay within the DC-DC converter; In response to receiving a vehicle collision signal, the vehicle high voltage is controlled to be powered down.

5. The vehicle power-off protection method according to claim 4, characterized in that: After receiving the vehicle safety signal, it also includes: Acquire the number of times a target vehicle safety signal is received within a first preset time period in history, wherein the target vehicle safety signal is a vehicle safety signal received when the relay is disconnected when the fuel cell is working; In response to the number being greater than or equal to a preset number, a vehicle fault prompt message is sent to the user.

6. The vehicle power-off protection method according to claim 5, characterized in that: After sending the vehicle fault prompt information to the user, it also includes: Determine a first adjustment coefficient for adjusting the first preset voltage change rate according to the number of times, and use the product of the first adjustment coefficient and the first preset voltage change rate as the adjusted first preset voltage change rate; The first adjustment coefficient is proportional to the number of times.

7. The vehicle power-off protection method according to claim 4, characterized in that: After receiving the vehicle safety signal, it also includes: Acquire a plurality of voltage peak-to-peak values ​​at the output end of the DC-DC converter within a second preset time period, and calculate the variance of the plurality of voltage peak-to-peak values; In response to the variance being greater than or equal to a preset variance, a vehicle fault prompt message is sent to the user.

8. The vehicle power-off protection method according to claim 7, characterized in that: After sending the vehicle fault prompt information to the user, the method further includes: Determine a second adjustment coefficient for adjusting the first preset voltage change rate according to the variance, and use the product of the second adjustment coefficient and the first preset voltage change rate as the adjusted first preset voltage change rate; The second adjustment coefficient is proportional to the variance.

9. An electronic device comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the program, the method according to any one of claims 1 to 8 is implemented.

10. A vehicle, characterized in that: The vehicle comprises the electronic device as claimed in claim 9.

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