A method and device for power-off under vehicle collision

Abstract

The present application provides a method and device for discharging electricity under vehicle collision. The method includes: when a vehicle collision occurs, reducing the output power of high-voltage components in the vehicle and disconnecting the high-voltage relay in the vehicle; determining whether the motor speed of the vehicle motor is abnormal; when the motor speed is abnormal, determining whether the motor speed is lower than a preset abnormal discharge speed; when the motor speed is lower than the abnormal discharge speed, forcibly driving the electric drive assembly system to perform active discharge; after a preset duration, determining whether the high-voltage bus voltage of the vehicle is less than 60V; when the high-voltage bus voltage is less than 60V, ending this process. It can be seen that implementing this implementation method can effectively release the residual electrical energy in the vehicle's high-voltage system, thereby avoiding the problem of electrical energy residue caused by motor operation, and further improving the safety of the vehicle after collision.

Description

Technical Field

[0001] The present application relates to the field of automobiles, and more particularly, to a method and device for powering off a vehicle during a collision. Background Art

[0002] After a vehicle collision, the vehicle will perform high-voltage power-off protection. However, simply cutting off the high-voltage relay is not sufficient because the process of powering off the vehicle's high voltage is complex. After cutting off the high-voltage relay, a large amount of energy is stored in the vehicle's high-voltage system due to the presence of capacitors, resulting in residual electrical energy in the high-voltage bus. Consequently, even after the high-voltage relay is cut off, the residual electrical energy in the vehicle's high-voltage system still poses a certain risk. Summary of the Invention

[0003] An object of embodiments of the present application is to provide a method and device for powering off a vehicle during a collision, which can effectively release the residual electrical energy in the vehicle's high-voltage system, thereby avoiding the problem of electrical energy residue caused by motor operation and improving the safety of the vehicle after a collision.

[0004] A first aspect of embodiments of the present application provides a method for powering off a vehicle during a collision, including:

[0005] When a vehicle collision occurs, reduce the output power of high-voltage components in the vehicle and disconnect the high-voltage relay in the vehicle;

[0006] Determine whether the motor speed of the vehicle motor is abnormal;

[0007] When the motor speed is abnormal, determine whether the motor speed is lower than a preset abnormal discharge speed;

[0008] When the motor speed is lower than the abnormal discharge speed, forcibly drive the electric drive assembly system to perform active discharge;

[0009] After a preset duration, determine whether the high-voltage bus voltage of the vehicle is less than 60V;

[0010] When the high-voltage bus voltage is less than 60V, end this process.

[0011] In the above implementation process, when a vehicle collision occurs, the method can reduce the output power of high-voltage components in the vehicle and disconnect the high-voltage relay in the vehicle; then, determine whether the motor speed of the vehicle motor is abnormal; and when the motor speed is abnormal, determine whether the motor speed is lower than a preset abnormal discharge speed; then, when the motor speed is lower than the abnormal discharge speed, forcibly drive the electric drive assembly system to perform active discharge; after a preset time period, determine whether the high-voltage bus voltage of the vehicle is less than 60V; and finally, when the high-voltage bus voltage is less than 60V, end this process. It can be seen that implementing this implementation method can effectively release the residual electric energy in the vehicle's high-voltage system, thus avoiding the problem of electric energy residue caused by motor operation, and further improving the safety of the vehicle after a collision.

[0012] Further, the method further includes:

[0013] Identifying whether a vehicle collision occurs through an airbag controller;

[0014] When the vehicle collides, perform the step of reducing the output power of the high-voltage components in the vehicle and disconnecting the high-voltage relay in the vehicle.

[0015] Further, the method further includes:

[0016] When the motor speed is normal, determine whether the motor speed is lower than a preset normal discharge speed;

[0017] When the motor speed is lower than the normal discharge speed, normally enable the electric drive assembly system to perform active discharge;

[0018] And perform the step of determining whether the high-voltage bus voltage of the vehicle is less than 60V.

[0019] Further, the method further includes:

[0020] When the high-voltage bus voltage is not less than 60V, forcibly drive the DC-DC converter in the vehicle to perform high-low voltage conversion, and trigger the execution of the step of determining whether the high-voltage bus voltage of the vehicle is less than 60V.

[0021] Further, the step of determining whether the motor speed of the vehicle motor is abnormal includes:

[0022] Within a preset judgment time period, determine whether the motor speed of the vehicle motor is reduced to the normal discharge speed;

[0023] When the motor speed is not reduced to the normal discharge speed, determine that the motor speed is abnormal.

[0024] The second aspect of the embodiments of the present application provides an electric device under vehicle collision, and the electric device under vehicle collision includes:

[0025] A processing unit, configured to reduce the output power of high-voltage components in the vehicle and disconnect the high-voltage relay in the vehicle when a vehicle collision occurs;

[0026] An abnormality determination unit, configured to determine whether the motor speed of the vehicle motor is abnormal;

[0027] A speed determination unit, configured to determine whether the motor speed is lower than a preset abnormal discharge speed when the motor speed is abnormal;

[0028] A discharge unit, configured to forcibly drive the electric drive assembly system to perform active discharge when the motor speed is lower than the abnormal discharge speed;

[0029] A voltage determination unit, configured to determine whether the high-voltage bus voltage of the vehicle is less than 60V after a preset time period; and end this process when the high-voltage bus voltage is less than 60V.

[0030] Further, the vehicle collision power-down device further includes:

[0031] An identification unit, configured to identify whether a vehicle collision occurs through a safety airbag controller;

[0032] The processing unit is specifically configured to reduce the output power of high-voltage components in the vehicle and disconnect the high-voltage relay in the vehicle when the vehicle collision occurs.

[0033] Further, the speed determination unit is further configured to determine whether the motor speed is lower than a preset normal discharge speed when the motor speed is normal;

[0034] The discharge unit is further configured to normally enable the electric drive assembly system to perform active discharge when the motor speed is lower than the normal discharge speed; and trigger the voltage determination unit to perform the operation of determining whether the high-voltage bus voltage of the vehicle is less than 60V.

[0035] A third aspect of the embodiments of the present application provides an electronic device, including a memory and a processor, where the memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the vehicle collision power-down method according to any one of the first aspects of the embodiments of the present application.

[0036] A fourth aspect of the embodiments of the present application provides a computer-readable storage medium, which stores computer program instructions, and when the computer program instructions are read and run by a processor, the vehicle collision power-down method according to any one of the first aspects of the embodiments of the present application is executed. Description of the Drawings

[0037] To more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. It should be understood that the following drawings only show some embodiments of the present application and should not be regarded as limiting the scope. For those of ordinary skill in the art, other related drawings can be obtained based on these drawings without creative efforts.

[0038] Figure 1 Schematic flowchart of a vehicle power-off method under vehicle collision provided by an embodiment of the present application;

[0039] Figure 2 Schematic structural diagram of a vehicle power-off device under vehicle collision provided by an embodiment of the present application;

[0040] Figure 3 Schematic diagram of the connection between high-voltage components provided by an embodiment of the present application. Detailed implementation manners

[0041] The following will describe the technical solutions in the embodiments of the present application in conjunction with the drawings in the embodiments of the present application.

[0042] It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings. At the same time, in the description of the present application, terms such as "first" and "second" are only used for distinguishing descriptions and cannot be understood as indicating or implying relative importance.

[0043] Embodiment 1

[0044] Please refer to Figure 1 , Figure 1 which provides a schematic flowchart of a vehicle power-off method for this embodiment. Among them, the vehicle power-off method includes:

[0045] S101. Identify whether the vehicle has collided through the airbag controller. If so, execute step S102; if not, end this process.

[0046] In this embodiment, in one case, the vehicle is driving and the motor has a certain rotational speed, and a collision occurs at this time.

[0047] In this embodiment, the airbag controller SRS identifies that a collision has occurred, sends a collision signal to the entire vehicle, and triggers the high-voltage power-off process of the entire vehicle.

[0048] S102. Reduce the output power of the high-voltage components in the vehicle and disconnect the high-voltage relay in the vehicle.

[0049] In this embodiment, this step is used to reduce the power of each high-voltage component, and the high-voltage relay is disconnected (the high-voltage connection between the power battery and other high-voltage devices on the high-voltage bus is disconnected).

[0050] S103. Within a preset judgment duration, judge whether the motor speed of the vehicle motor has decreased to the normal discharge speed. If so, execute step S106; if not, execute step S104.

[0051] S104. Judge whether the motor speed is lower than the preset abnormal discharge speed. If so, execute step S105; if not, end this process.

[0052] S105. Force the drive motor assembly system to perform active discharge, and execute step S108.

[0053] In this embodiment, this step is used to force the drive motor assembly to perform active discharge (it will cause certain damage to the drive motor module; but for the high-voltage safety of the whole vehicle, the drive motor assembly needs to make some sacrifices here).

[0054] S106. Judge whether the motor speed is lower than the preset normal discharge speed. If so, execute step S107; if not, end this process.

[0055] S107. Normally enable the drive motor assembly system to perform active discharge, and execute step S108.

[0056] In this embodiment, this step is used to normally enable the drive motor assembly to perform active discharge.

[0057] S108. After a preset duration, judge whether the high-voltage bus voltage of the vehicle is less than 60V. If so, end this process; if not, execute step S109.

[0058] S109. Force the DC-DC converter in the vehicle to perform high-low voltage conversion, and trigger the execution of step S108.

[0059] In this embodiment, this step can forcibly enable the DCDC to perform high-voltage to low-voltage conversion (it will cause certain damage to the DCDC). When the high-voltage bus voltage is lower than 60V, the process ends. (Forcibly enabling the DCDC will cause certain damage to the DCDC; but for the high-voltage safety of the whole vehicle, the DCDC needs to make some sacrifices here).

[0060] In this embodiment, forcing the DCDC to work will cause certain damage to the DCDC. This is because the working environment does not match the designed normal working environment. Among them, this part is mainly reflected in the aspects of voltage and power supply: At this time, the vehicle's high voltage has been cut off, and the electrical energy on the high-voltage bus is only "residual electrical energy" (mainly the energy stored in the X capacitors of each high-voltage component, especially the electric drive assembly) to supply energy to the DCDC; moreover, the voltage on the bus is also relatively low, and it may not reach the voltage when the DCDC works normally.

[0061] In this embodiment, here we borrow the method of forcing the DCDC to enable to consume the residual electrical energy of the high-voltage bus to quickly reduce the bus voltage to below the safety line (60V). The main considerations are as follows:

[0062] 1. The DCDC function is relatively easier to drive and control compared to other high-voltage components;

[0063] 2. The characteristics of the DCDC component result in relatively less damage (borrowing the working mechanism of the DCDC from high-voltage DC to low-voltage DC).

[0064] Please refer to Figure 3 , Figure 3 which shows a schematic diagram of the connection between high-voltage components.

[0065] In this embodiment, the overall idea of this method is as follows:

[0066] By identifying the occurrence of a collision, after cutting off the relay, the speed of the electric drive is determined. When the speed is lower than a certain threshold (this threshold is the speed threshold determined when the high voltage is normal), the electric drive is forced to perform an active discharge action. Under normal high-voltage power supply, when the speed of the electric drive is lower than threshold 1 (i.e., the normal discharge speed), the electric drive performs an active discharge action to consume the residual electrical energy of the bus; when the speed of the electric drive is abnormal after a collision, the speed of the electric drive is lower than threshold 2 (i.e., the abnormal discharge speed), where threshold 2 > threshold 1. The electric drive forcibly performs an active discharge action to consume the residual electrical energy of the bus (which may cause certain damage to the electric drive module). Increase the detection of abnormal speed of the electric drive after a collision; increase measures to consume the residual electrical energy of the high-voltage bus: force the DCDC (DC converter) to work.

[0067] For example, the working condition suitable for this method is that a collision occurs during the vehicle's driving. Then, this method can trigger the process of cutting off the high voltage of the whole vehicle, and each high-voltage component of the whole vehicle reduces power and stops output, and the high-voltage relay is cut off; at this time, due to the collision, the vehicle axle breaks, and the motor of the electric drive assembly is still idling and remains in a high-speed state; and the speed is determined and compared with threshold 2. When it is lower than threshold 2, the electric drive assembly is forced to perform an active discharge. Then, after the active discharge time lasts for the threshold time t, if the bus voltage still cannot be reduced to below 60V, the DCDC is forced to work (converting high-voltage DC to low-voltage DC 12V electricity) until the high-voltage bus voltage is reduced to below 60V.

[0068] In this embodiment, the execution subject of the method may be a computing device such as a computer or a server, and no limitation is made in this embodiment.

[0069] In this embodiment, the execution subject of the method may also be a smart device such as a smart phone or a tablet computer, and no limitation is made in this embodiment.

[0070] It can be seen that implementing the vehicle collision power-down method described in this embodiment can solve the problem that the motor speed fails due to factors such as axle breakage during a collision, resulting in the failure of the vehicle's high-voltage power-down.

[0071] Embodiment 2

[0072] Please refer to Figure 2 , Figure 2 which is a schematic structural diagram of a vehicle collision power-down device provided in this embodiment. As Figure 2 shown, the vehicle collision power-down device includes:

[0073] A processing unit 210, configured to reduce the output power of high-voltage components in the vehicle and disconnect the high-voltage relay in the vehicle when a vehicle collision occurs;

[0074] An abnormality determination unit 220, configured to determine whether the motor speed of the vehicle motor is abnormal;

[0075] A speed determination unit 230, configured to determine whether the motor speed is lower than a preset abnormal discharge speed when the motor speed is abnormal;

[0076] A discharge unit 240, configured to forcibly drive the electric drive assembly system to perform active discharge when the motor speed is lower than the abnormal discharge speed;

[0077] A voltage determination unit 250, configured to determine whether the high-voltage bus voltage of the vehicle is less than 60V after a preset time period; and end this process when the high-voltage bus voltage is less than 60V.

[0078] As an optional implementation manner, the vehicle collision power-down device further includes:

[0079] An identification unit 260, configured to identify whether a vehicle collision occurs through a safety airbag controller.

[0080] The processing unit 210 is specifically configured to reduce the output power of high-voltage components in the vehicle and disconnect the high-voltage relay in the vehicle when a vehicle collision occurs.

[0081] As an optional implementation manner, the speed determination unit 230 is further configured to determine whether the motor speed is lower than a preset normal discharge speed when the motor speed is normal;

[0082] The discharge unit 240 is further configured to, when the motor speed is lower than the normal discharge speed, normally enable the electric drive assembly system to perform active discharge; and trigger the voltage judgment unit 250 to execute an operation of judging whether the high-voltage bus voltage of the vehicle is less than 60V.

[0083] As an alternative implementation, the vehicle collision power-off device further includes:

[0084] The transformer unit 270 is configured to, when the high-voltage bus voltage is not less than 60V, forcibly drive the DC-DC converter in the vehicle to perform high-low voltage conversion, and trigger the voltage judgment unit 250 to execute an operation of judging whether the high-voltage bus voltage of the vehicle is less than 60V.

[0085] As an alternative implementation, the abnormality judgment unit 220 includes:

[0086] A judgment subunit 221, configured to judge whether the motor speed of the vehicle motor is reduced to the normal discharge speed within a preset judgment duration;

[0087] A determination subunit 222, configured to determine that the motor speed is abnormal when the motor speed is not reduced to the normal discharge speed.

[0088] In this embodiment, the explanation of the vehicle collision power-off device may refer to the description in Embodiment 1, and thus will not be elaborated herein.

[0089] It can be seen that implementing the vehicle collision power-off device described in this embodiment can solve the problem that the motor speed fails due to factors such as axle fracture during a collision, thereby causing the vehicle's high-voltage power-off to fail.

[0090] An embodiment of the present application provides an electronic device, including a memory and a processor. The memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the vehicle collision power-off method in Embodiment 1 of the present application.

[0091] An embodiment of the present application provides a computer-readable storage medium, which stores computer program instructions. When the computer program instructions are read and run by a processor, the vehicle collision power-off method in Embodiment 1 of the present application is executed.

[0092] In several embodiments provided in this application, it should be understood that the disclosed devices and methods can also be implemented in other ways. The device embodiments described above are merely illustrative. For example, the flowcharts and block diagrams in the accompanying drawings show the possible architectures, functions, and operations of devices, methods, and computer program products according to multiple embodiments of this application. In this regard, each block in the flowchart or block diagram can represent a module, a program segment, or a part of code, and the module, program segment, or part of code contains one or more executable instructions for implementing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the blocks may occur in a different order than that marked in the accompanying drawings. For example, two consecutive blocks can actually be executed substantially in parallel, and they can sometimes be executed in the reverse order, depending on the functions involved. It should also be noted that each block in the block diagram and / or flowchart, as well as the combination of blocks in the block diagram and / or flowchart, can be implemented by a dedicated hardware-based system that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0093] In addition, each functional module in various embodiments of this application can be integrated together to form an independent part, or each module can exist separately, or two or more modules can be integrated to form an independent part.

[0094] If the above functions are implemented in the form of software function modules and sold or used as an independent product, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of this application. The aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical discs, etc., which can store program codes.

[0095] The above are only embodiments of the present application and are not intended to limit the protection scope of the present application. For those skilled in the art, various changes and modifications can be made to the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application. It should be noted that similar reference numerals and letters indicate similar items in the following drawings. Therefore, once an item is defined in one drawing, it does not need to be further defined and explained in subsequent drawings.

[0096] As described above, these are only the specific implementation manners of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of changes or replacements within the technical scope disclosed in the present application, and all should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

[0097] It should be noted that in this text, relative 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 variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, an element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the said element.

Claims

1. A method for electricity under vehicle collision, characterized in that including: When a vehicle collision occurs, reducing the output power of high-voltage components in the vehicle and disconnecting high-voltage relays in the vehicle; judging whether the motor speed of the vehicle motor is abnormal; When the motor speed is abnormal, judging whether the motor speed is lower than a preset abnormal discharge speed; When the motor speed is lower than the abnormal discharge speed, forcibly driving the electric drive assembly system to perform active discharge; After a preset duration, judging whether the high-voltage bus voltage of the vehicle is less than 60V; When the high-voltage bus voltage is less than 60V, ending this process; Wherein, the method further includes: When the motor speed is normal, judging whether the motor speed is lower than a preset normal discharge speed; When the motor speed is lower than the normal discharge speed, normally enabling the electric drive assembly system to perform active discharge; and performing the step of judging whether the high-voltage bus voltage of the vehicle is less than 60V.

2. The vehicle collision power-off method according to claim 1, wherein The method further includes: identifying whether a vehicle collision occurs through an airbag controller; When the vehicle collision occurs, performing the step of reducing the output power of high-voltage components in the vehicle and disconnecting high-voltage relays in the vehicle.

3. The vehicle collision power-off method according to claim 1, wherein The method further includes: When the high-voltage bus voltage is not less than 60V, forcibly driving the DC converter in the vehicle to perform high-low voltage conversion, and triggering the execution of the step of judging whether the high-voltage bus voltage of the vehicle is less than 60V.

4. The vehicle collision power-off method according to claim 1, wherein The step of judging whether the motor speed of the vehicle motor is abnormal includes: Within a preset judgment duration, judging whether the motor speed of the vehicle motor is reduced to the normal discharge speed; When the motor speed is not reduced to the normal discharge speed, determining that the motor speed is abnormal.

5. An electrical device under vehicle collision, characterized in that, The vehicle collision power-down device includes: A processing unit, configured to reduce the output power of high-voltage components in the vehicle and disconnect high-voltage relays in the vehicle when a vehicle collision occurs; An abnormality judgment unit, configured to judge whether the motor speed of the vehicle motor is abnormal; A speed judgment unit, configured to judge whether the motor speed is lower than a preset abnormal discharge speed when the motor speed is abnormal; A discharge unit, configured to forcibly drive the electric drive assembly system to perform active discharge when the motor speed is lower than the abnormal discharge speed; A voltage judgment unit, configured to judge whether the high-voltage bus voltage of the vehicle is less than 60V after a preset duration; and ending this process when the high-voltage bus voltage is less than 60V; Wherein, the speed judgment unit is further configured to judge whether the motor speed is lower than a preset normal discharge speed when the motor speed is normal; The discharge unit is further configured to normally enable the electric drive assembly system to perform active discharge when the motor speed is lower than the normal discharge speed; and trigger the voltage judgment unit to execute the operation of judging whether the high-voltage bus voltage of the vehicle is less than 60V.

6. The vehicle collision power-off device according to claim 5, wherein The vehicle collision power-down device further includes: An identification unit, configured to identify whether a vehicle collision occurs through an airbag controller; The processing unit is specifically configured to reduce the output power of high-voltage components in the vehicle and disconnect high-voltage relays in the vehicle when the vehicle collision occurs.

7. An electronic device, characterized in that, The electronic device includes a memory and a processor. The memory is used to store a computer program, and the processor runs the computer program to enable the electronic device to execute the vehicle power-off method according to any one of claims 1 to 4.

8. A readable storage medium, characterized in that, Computer program instructions are stored in the readable storage medium. When the computer program instructions are read and run by a processor, the vehicle power-off method according to any one of claims 1 to 4 is executed.

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