High-voltage battery pre-charge resistor protection method and system, vehicle controller, medium

Abstract

The present invention relates to a high-voltage battery pre-charge resistor protection method and system, a vehicle control unit, and a medium, including: when the vehicle control unit receives a high-voltage power-on request, the vehicle control unit controls the counter to increment by 1; and when the counting result of the counter is greater than or equal to 1, at every preset time interval, the vehicle control unit controls the counter to decrement by 1; when the vehicle control unit receives a high-voltage power-off request and meets the preset vehicle high-voltage power-off condition, the vehicle control unit determines the power-off delay time according to the current counting result of the counter, and after delaying the power-off delay time, if there is no high-voltage power-on request and the preset vehicle high-voltage power-off condition is still met, the vehicle control unit controls the vehicle to enter the high-voltage power-off process.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and particularly to a method and system for protecting a pre-charge resistor of a high-voltage battery, a vehicle controller, and a computer-readable storage medium. Background Art

[0002] Figure 1 As shown in a high-voltage battery circuit structure of an electric vehicle, Figure 1 as shown, when the high-voltage battery of the electric vehicle closes the high-voltage relay during high-voltage power-on, a large current will be generated; in order to limit the power-on current, the main negative relay is first closed during high-voltage power-on, and then pre-charging is performed through the pre-charge relay and the pre-charge resistor; when the voltage outside the high-voltage battery is basically the same as the voltage inside the high-voltage battery, the main positive relay is closed and the pre-charge relay is disconnected to complete the high-voltage power-on process. Figure 1 The circuit structure shown has the following technical problems: since a large current passes through the pre-charge resistor during the high-voltage power-on process, the pre-charge resistor will generate a certain amount of heat. If the high-voltage power-on and power-off are performed multiple times in a short period of time, then a large amount of heat will accumulate in the pre-charge resistor. If the heat dissipation of the pre-charge resistor cannot be performed in time, there is a risk of burning. At present, to identify whether the pre-charge resistor is overheated, a complex thermodynamic model needs to be established, and after identifying that the pre-charge resistor is overheated, the high-voltage power-on process will be prohibited or postponed, so that the high-voltage power-on request cannot be responded to in time. Therefore, this method cannot fundamentally solve the problem of overheating of the pre-charge resistor. Summary of the Invention

[0003] The purpose of the present invention is to provide a method and system for protecting a pre-charge resistor of a high-voltage battery, a vehicle controller, and a computer-readable storage medium, so as to avoid frequent pre-charging operations on the pre-charge resistor of the high-voltage battery, and be able to respond to the high-voltage power-on request in time, thereby realizing the protection of the pre-charge resistor and ensuring high-voltage safety.

[0004] To achieve the above purpose, the first aspect of the present invention provides a method for protecting a pre-charge resistor of a high-voltage battery, including:

[0005] When the vehicle controller receives a high-voltage power-on request, the vehicle controller controls the counter to increment by 1; and when the counting result of the counter is greater than or equal to 1, at every preset time interval, the vehicle controller controls the counter to decrement by 1;

[0006] When the vehicle controller receives a high-voltage power-off request and meets the preset vehicle high-voltage power-off conditions, the vehicle controller determines the power-off delay time according to the current counting result of the counter, and after delaying the power-off delay time, if there is no high-voltage power-on request and still meets the preset vehicle high-voltage power-off conditions, the vehicle controller controls the vehicle to enter the high-voltage power-off process.

[0007] Optionally, the counting result of the counter corresponds to the power-down delay time, and the correspondence between the two is pre-calibrated; wherein, the larger the numerical value of the counter counting result, the longer the corresponding power-down delay time.

[0008] Optionally, the method further includes:

[0009] If the vehicle controller receives a high-voltage power-on request during the delay of the power-down delay time, the vehicle controller responds to the high-voltage power-on request, controls the vehicle to enter the high-voltage power-on process, and the counter count is incremented by 1.

[0010] Optionally, the high-voltage power-on request includes at least a vehicle ignition request, a slow charge power-on request, a fast charge power-on request, and a remote request; the preset vehicle high-voltage power-down conditions include: the vehicle speed is less than a preset vehicle speed threshold, the high-voltage current is less than a preset current threshold, and each high-voltage component is not in a power-consuming or power-generating mode.

[0011] A second aspect of the present invention proposes a high-voltage battery pre-charge resistor protection system, including:

[0012] A power-on counting unit, configured to control the counter count to be incremented by 1 in response to receiving a high-voltage power-on request; and, when the counting result of the counter is greater than or equal to 1, when the counting result of the counter is greater than or equal to 1, at every preset time interval, the vehicle controller controls the counter count to be decremented by 1;

[0013] A power-down control unit, configured to, in response to receiving a high-voltage power-down request and meeting the preset vehicle high-voltage power-down conditions, the vehicle controller determines the power-down delay time according to the current counting result of the counter, and after delaying the power-down delay time, if there is no high-voltage power-on request and the preset vehicle high-voltage power-down conditions are still met, controls the vehicle to enter the high-voltage power-down process.

[0014] Optionally, the counting result of the counter corresponds to the power-down delay time, and the correspondence between the two is pre-calibrated; wherein, the larger the numerical value of the counter counting result, the longer the corresponding power-down delay time.

[0015] Optionally, the power-down control unit is further configured to:

[0016] If the vehicle controller receives a high-voltage power-on request during the delay of the power-down delay time, it responds to the high-voltage power-on request, controls the vehicle to enter the high-voltage power-on process, and the counter count is incremented by 1.

[0017] Optionally, the high-voltage power-on request includes at least a vehicle ignition request, a slow charge power-on request, a fast charge power-on request, and a remote request; the preset vehicle high-voltage power-down conditions include: the vehicle speed is less than a preset vehicle speed threshold, the high-voltage current is less than a preset current threshold, and each high-voltage component is not in a power-consuming or power-generating mode.

[0018] In the third aspect of the present invention, a vehicle controller is proposed, including: a memory and a processor. Computer-readable instructions are stored in the memory. When the computer-readable instructions are executed by the processor, the processor is caused to execute the steps of the high-voltage battery pre-charge resistor protection method according to the first aspect.

[0019] In the fourth aspect of the present invention, a computer-readable storage medium is proposed, on which a computer program is stored. When the computer program is executed by a processor, the steps of the high-voltage battery pre-charge resistor protection method according to the first aspect are implemented.

[0020] Implementing the above high-voltage battery pre-charge resistor protection method, system, vehicle controller, and storage medium has at least the following beneficial effects: By monitoring the high-voltage power-on and power-off requests, reasonably controlling the high-voltage battery power-on and power-off processes, determining the power-off delay time according to the high-voltage power-on request frequency, and delaying to enter the high-voltage power-off process according to the power-off delay time, it effectively avoids frequent pre-charge operations on the high-voltage battery pre-charge resistor and can promptly respond to the high-voltage power-on request, thereby realizing the protection of the pre-charge resistor and ensuring high-voltage safety.

[0021] Other features and advantages of the present invention will be described in the subsequent specification. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0023] Figure 1 It is a schematic diagram of the high-voltage battery circuit structure of an electric vehicle.

[0024] Figure 2 It is a flowchart of a high-voltage battery pre-charge resistor protection method in an embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of the principle of a high-voltage battery pre-charge resistor protection method in an embodiment of the present invention.

[0026] Figure 4 It is a schematic diagram of the structure of a high-voltage battery pre-charge resistor protection system in another embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0027] Various exemplary embodiments, features, and aspects of the present disclosure will be described in detail below with reference to the accompanying drawings. Additionally, for a better illustration of the present invention, numerous specific details are provided in the following specific embodiments. Those skilled in the art should understand that the present invention can be implemented without some of these specific details. In some instances, means well-known to those skilled in the art are not described in detail in order to highlight the gist of the present invention.

[0028] An embodiment of the present invention provides a method for protecting a pre-charge resistor of a high-voltage battery. As shown in the electric vehicle high-voltage battery circuit structure Figure 1 The over-temperature of the pre-charge resistor in Figure 1 is mostly caused by malicious operations of external personnel in most cases. For example, repeatedly operating the start button continuously within a short period of time. In the embodiment of the present invention, by detecting the frequency of powering on and off the high-voltage system, when frequent powering on and off operations are detected, the high-voltage power-off is postponed to give the pre-charge resistor sufficient cooling time to achieve the purpose of protecting the pre-charge resistor.

[0029] Specifically, referring to Figures 2 - 3 , the method of the embodiment of the present invention includes the following steps S1 to S2:

[0030] Step S1: When the vehicle control unit receives a high-voltage power-on request, the vehicle control unit controls the counter to increment by 1; and when the counting result of the counter is greater than or equal to 1, at every preset time interval, the vehicle control unit controls the counter to decrement by 1.

[0031] Exemplarily, the high-voltage power-on request includes a vehicle ignition request (IGN ON), a slow charge power-on request, a fast charge power-on request, a remote request, etc.

[0032] In the step, the final power-on request is obtained by summarizing various high-voltage power-on requests. For example, in the high-voltage power-on request in Figure 3 , 0 indicates no request, and 1 indicates a request; the high-voltage power-on frequency counting is triggered according to the power-on request, that is, when a high-voltage power-on request is received, the counter is incremented by 1 accordingly.

[0033] In the embodiment of the present invention, a counter decay timer is designed. When the counting result of the counter is greater than or equal to 1, the counter decay timer is triggered. At every preset time interval, the vehicle control unit controls the counter to decrement by 1 until the counting result of the counter is cleared. In this way, even if there were very frequent high-voltage powering on and off before, when the high-voltage power-on request remains unchanged, the delay time of power-off can be decayed to ensure that the next power-off response can be executed immediately.

[0034] Among them, the preset time interval is preferably but not limited to 2 seconds.

[0035] Step S2: When the vehicle controller receives a high-voltage power-off request and meets the preset vehicle high-voltage power-off conditions, the vehicle controller determines the power-off delay time according to the counting result of the current counter. After delaying the power-off delay time, if there is no high-voltage power-on request and the preset vehicle high-voltage power-off conditions are still met, the vehicle controller controls the vehicle to enter the high-voltage power-off process.

[0036] Specifically, the preset vehicle high-voltage power-off conditions can be set as follows: the vehicle speed is less than the preset vehicle speed threshold, the high-voltage current is less than the preset current threshold, and each high-voltage component is not in a power-consuming or power-generating mode; in this embodiment, the preset vehicle speed threshold is preferably but not limited to 1.5 km / h; the preset current threshold is preferably but not limited to 5 A. The counting result of the counter corresponds to the power-off delay time, and the corresponding relationship between the two is pre-calibrated. The high-voltage power-off delay time needs to be set according to the number of high-voltage power-ons and the vehicle environment. That is, under the most severe conditions, the set delay time can fully cool the pre-charge resistor due to multiple high-voltage power-ups and power-downs. Generally speaking, the larger the numerical value of the counter counting result, the longer the power-off delay time. For example, when the numerical value of the counter counting result is 1, the delay is 0.02 s; when the numerical value of the counter counting result is equal to 2, the delay is 0.3 s; when the numerical value of the counter counting result is 3, the delay is 2 s; the specific numerical values can be calibrated in combination with the actual vehicle, that is, it is necessary to ensure that the delay time can allow sufficient cooling time for the pre-charge resistor.

[0037] When the battery high-voltage relay is closed (such as the high-voltage relay closed state in the appendix Figure 2 where 0 means not closed and 1 means closed), after the vehicle enters the high-voltage power-on state, if there is no high-voltage power-on request at this time, that is, request to lower the high voltage.

[0038] When the power-off delay time is reached, the preset vehicle high-voltage power-off conditions are met, and there is no high-voltage power-on request, the vehicle enters the high-voltage power-off process. As shown in the circuit of Figure 1 , the high-voltage relay is disconnected to complete the power-off.

[0039] In a specific example, if the vehicle controller receives a high-voltage power-on request during the delay of the power-off delay time, the vehicle controller responds to the high-voltage power-on request, controls the vehicle to enter the high-voltage power-on process, and the counter count is incremented by 1.

[0040] Continue to refer to Figure 1 , in this example, if a high-voltage power-on request is received again during the power-off delay process, since the high-voltage relay in Figure 1 has not been requested to be disconnected, it can directly enter the high-voltage power-on state without operating the high-voltage relay. At this time, it can also avoid the pre-charge of the pre-charge resistor during the high-voltage power-on process, causing its temperature rise. At the same time, the counter is incremented by 1, and the delay time during the next high-voltage power-off will also be lengthened.

[0041] Specifically, referring to Figure 3 , as shown in area A of Figure 3 , when the electric delay time under high voltage has not reached and a high-voltage power-on request is received again, the next power-off delay time under high voltage is reset according to the value of the current high-voltage power-on counter. At the same time, since the vehicle has not entered the high-voltage power-off process and the high-voltage relay is still in the closed state, there is no need to operate the high-voltage relay, as shown in area B of Figure 3 . After the high-voltage power-off delay time is reached, if there is still no high-voltage power-on request, the high-voltage power-off process is entered and the high-voltage relay is disconnected, as shown in area C of Figure 3 .

[0042] It should be noted that compared with the existing real-time monitoring of the pre-charge resistor temperature, the method of this embodiment sets the high-voltage power-off delay time according to the number of current high-voltage power-on times, giving the pre-charge resistor sufficient cooling time, and fundamentally avoiding the temperature rise of the pre-charge resistor. Moreover, if a new high-voltage power-on request is received during the delayed high-voltage power-off process, the high-voltage power-on state can be directly entered, avoiding the on-off of the high-voltage relay and extending the service life of the high-voltage relay.

[0043] Referring to Figure 4 , another embodiment of the present invention proposes a high-voltage battery pre-charge resistor protection system, including:

[0044] A power-on counting unit 1, configured to control the counter to increment by 1 in response to receiving a high-voltage power-on request; and, when the counting result of the counter is greater than or equal to 1, when the counting result of the counter is greater than or equal to 1, at every preset time interval, the vehicle controller controls the counter to decrement by 1;

[0045] A power-off control unit 2, configured to, in response to receiving a high-voltage power-off request and meeting the preset vehicle high-voltage power-off condition, the vehicle controller determines the power-off delay time according to the current counting result of the counter, and after delaying the power-off delay time, if there is no high-voltage power-on request and the preset vehicle high-voltage power-off condition is still met, then controls the vehicle to enter the high-voltage power-off process.

[0046] Optionally, the counting result of the counter corresponds to the power-off delay time, and the corresponding relationship between the two is pre-calibrated; wherein, the larger the numerical value of the counting result of the counter, the longer the corresponding power-off delay time.

[0047] Optionally, the power-off control unit 2 is further configured to:

[0048] If the vehicle controller receives a high-voltage power-on request during the delay of the power-off delay time, then in response to the high-voltage power-on request, controls the vehicle to enter the high-voltage power-on process, and the counter increments by 1.

[0049] Optionally, the high-voltage power-on request at least includes a vehicle ignition request, a slow charging power-on request, a fast charging power-on request, and a remote request; the preset vehicle high-voltage power-off conditions include: the vehicle speed is less than a preset vehicle speed threshold, the high-voltage current is less than a preset current threshold, and each high-voltage component is not in a power-consuming or power-generating mode.

[0050] The system embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated. The components shown as units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0051] It should be noted that the system described in the above embodiment corresponds to the method described in the above embodiment. Therefore, the parts not detailed in the system described in the above embodiment can be obtained by referring to the content of the method described in the above embodiment. That is, the specific step content recorded in the method of the above embodiment can be understood as the functions that can be realized by the system of this embodiment, and will not be elaborated here.

[0052] Furthermore, when the high-voltage battery pre-charge resistor protection system described in the above embodiment is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium.

[0053] Another embodiment of the present invention also proposes a vehicle controller, including: a memory and a processor. Computer-readable instructions are stored in the memory. When the computer-readable instructions are executed by the processor, the processor executes the steps of the high-voltage battery pre-charge resistor protection method according to the above embodiment.

[0054] Of course, the vehicle controller may also have components such as a wired or wireless network interface, a keyboard, and an input / output interface for input / output. The vehicle controller may further include other components for implementing the functions of the device, which will not be elaborated here.

[0055] Exemplarily, the computer program can be divided into one or more units. The one or more units are stored in the memory and executed by the processor to complete the present invention. The one or more units may be a series of computer program instruction segments capable of completing specific functions, and these instruction segments are used to describe the execution process of the computer program in the vehicle controller.

[0056] The processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The processor is the control center of the vehicle controller and connects all parts of the entire vehicle controller through various interfaces and circuits.

[0057] The memory can be used to store the computer program and / or unit. The processor realizes various functions of the vehicle controller by running or executing the computer program and / or unit stored in the memory, and by calling the data stored in the memory. In addition, the memory may include high-speed random access memory, and may also include non-volatile memory, such as a hard disk, memory, plug-in hard disk, Smart Media Card (SMC), Secure Digital (SD) card, Flash Card, at least one magnetic disk storage device, flash device, or other volatile solid-state storage devices.

[0058] 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 steps of the high-voltage battery pre-charge resistor protection method described in the above embodiment are realized.

[0059] Specifically, the computer-readable storage medium may include: any entity or device capable of carrying the computer program code, recording medium, USB flash drive, mobile hard disk, magnetic disk, optical disc, computer memory, Read-Only Memory (ROM), Random Access Memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc.

[0060] The embodiments of the present invention have been described above. The above description is exemplary and not exhaustive, and is also not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art without departing from the scope and spirit of the described embodiments. The choice of terms used herein is intended to best explain the principles of the embodiments, the practical application, or the improvement of technologies in the market, or to enable other ordinary skill in the art to understand the embodiments disclosed herein.

Claims

1. A pre-charge resistor protection method for a high-voltage battery, characterized in that Including: When the vehicle controller receives a high-voltage power-on request, the vehicle controller controls the counter to increment by 1. And, when the counting result of the counter is greater than or equal to 1, at every preset time interval, the vehicle controller controls the counter to decrement by 1. When the vehicle controller receives a high-voltage power-off request and meets the preset vehicle high-voltage power-off conditions, the vehicle controller determines the power-off delay time according to the current counting result of the counter, and after delaying the power-off delay time, if there is no high-voltage power-on request and the preset vehicle high-voltage power-off conditions are still met, then the vehicle controller controls the vehicle to enter the high-voltage power-off process. The method further includes: If during the delay of the power-off delay time, the vehicle controller receives a high-voltage power-on request, then the vehicle controller responds to the high-voltage power-on request, controls the vehicle to enter the high-voltage power-on process, and the counter increments by 1.

2. The pre-charge resistor protection method for a high-voltage battery according to claim 1, characterized in that, The counting result of the counter corresponds to the power-off delay time, and the corresponding relationship between the two is pre-calibrated; among them, the larger the numerical value of the counter counting result, the longer the corresponding power-off delay time.

3. The high-voltage battery pre-charge resistor protection method according to any one of claims 1 to 2, characterized in that, The high-voltage power-on request at least includes a vehicle ignition request, a slow charge power-on request, a fast charge power-on request, and a remote request. The preset vehicle high-voltage power-off conditions include: the vehicle speed is less than a preset vehicle speed threshold, the high-voltage current is less than a preset current threshold, and each high-voltage component is not in a power-consuming or power-generating mode.

4. A high-voltage battery pre-charge resistor protection system, characterized in that, Including: A power-on counting unit, configured to control the counter to increment by 1 in response to receiving a high-voltage power-on request. And, when the counting result of the counter is greater than or equal to 1, at every preset time interval, the vehicle controller controls the counter to decrement by 1; a power-off control unit, configured to, in response to receiving a high-voltage power-off request and meeting the preset vehicle high-voltage power-off conditions, the vehicle controller determines the power-off delay time according to the current counting result of the counter, and after delaying the power-off delay time, if there is no high-voltage power-on request and the preset vehicle high-voltage power-off conditions are still met, then controls the vehicle to enter the high-voltage power-off process. And, the power-off control unit is further configured to: If during the delay of the power-off delay time, the vehicle controller receives a high-voltage power-on request, then respond to the high-voltage power-on request, control the vehicle to enter the high-voltage power-on process, and the counter increments by 1.

5. The high-voltage battery pre-charge resistor protection system according to claim 4, characterized in that, The counting result of the counter corresponds to the power-off delay time, and the corresponding relationship between the two is pre-calibrated; among them, the larger the numerical value of the counter counting result, the longer the corresponding power-off delay time.

6. The pre-charge resistor protection system for a high-voltage battery according to claim 4 or 5, characterized in that, The high-voltage power-on request at least includes a vehicle ignition request, a slow charge power-on request, a fast charge power-on request, and a remote request. The preset vehicle high-voltage power-off conditions include: the vehicle speed is less than a preset vehicle speed threshold, the high-voltage current is less than a preset current threshold, and each high-voltage component is not in a power-consuming or power-generating mode.

7. A vehicle controller, comprising: A memory and a processor, wherein computer-readable instructions are stored in the memory, and when the computer-readable instructions are executed by the processor, the processor executes the steps of the high-voltage battery pre-charge resistor protection method according to any one of claims 1-3.

8. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by the processor, it implements the steps of the high-voltage battery pre-charge resistor protection method according to any one of claims 1 to 3.

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