Overcurrent protection parameter determination method, power isolation device, vehicle and storage medium

Abstract

The application relates to the technical field of vehicles and discloses an overcurrent protection parameter determination method, a power supply isolation device, a vehicle and a storage medium.The method comprises the following steps: acquiring a real-time adhesion coefficient corresponding to a vehicle; the real-time adhesion coefficient is determined based on a real-time road surface state in which the vehicle is located; determining a real-time adjustment coefficient corresponding to the real-time road surface adhesion coefficient according to a mapping table between preset adhesion coefficients and adjustment coefficients; the real-time adjustment coefficient is used for representing the adjustment degree of a reference overcurrent protection parameter based on the real-time road surface adhesion coefficient; adjusting the reference overcurrent protection parameter based on the real-time adjustment coefficient to obtain a first overcurrent protection parameter corresponding to the vehicle; and the first overcurrent protection parameter is used for overcurrent protection of the vehicle when the vehicle is in a normal control state.The application can determine the first overcurrent protection parameter suitable for the current driving condition, flexibly adapt to the protection requirements under different driving conditions, and effectively protect the vehicle from overcurrent.

Description

Technical Field

[0001] This invention relates to the field of vehicle technology, specifically to a method for determining overcurrent protection parameters, a power isolation device, a vehicle, and a storage medium. Background Technology

[0002] During vehicle operation, in order to avoid damage to electrical components or system failures due to abnormal current increases, it is usually necessary to set up an appropriate overcurrent protection mechanism in the power isolation device so that the power isolation device can safely connect or disconnect the high-voltage main circuit during vehicle power-on or driving, thereby achieving overcurrent protection for the vehicle.

[0003] Existing overcurrent protection mechanisms typically employ pre-set fixed protection parameters to protect vehicles from overcurrent. However, overcurrent protection mechanisms that use fixed protection parameters are insufficient to meet the protection requirements under different driving conditions, thus hindering effective overcurrent protection for vehicles. Summary of the Invention

[0004] This invention provides a method for determining overcurrent protection parameters, a power isolation device, a vehicle, and a storage medium to solve the problem that overcurrent protection mechanisms based on sampling and fixing protection parameters are difficult to meet the protection requirements under different driving conditions, thus making it difficult to achieve effective overcurrent protection for vehicles.

[0005] In a first aspect, the present invention provides a method for determining overcurrent protection parameters, comprising: Obtain the real-time adhesion coefficient for the vehicle; the real-time adhesion coefficient is determined based on the real-time road conditions in which the vehicle is located. Based on the preset mapping table between the adhesion coefficient and the adjustment coefficient, the real-time adjustment coefficient corresponding to the real-time road surface adhesion coefficient is determined; the real-time adjustment coefficient is used to characterize the degree of adjustment of the reference overcurrent protection parameters based on the real-time road surface adhesion coefficient. The reference overcurrent protection parameters are adjusted based on the real-time adjustment coefficient to obtain the first overcurrent protection parameters corresponding to the vehicle; the first overcurrent protection parameters are used to provide overcurrent protection for the vehicle when it is in a normal control state.

[0006] The overcurrent protection parameter determination method provided in this embodiment can reflect the vehicle's adhesion capability under the current driving conditions by determining the real-time adhesion coefficient based on the real-time road conditions corresponding to the vehicle. Then, the reference overcurrent protection parameters can be adjusted by using the real-time adhesion coefficient that conforms to the current driving conditions to obtain the first overcurrent protection parameters adapted to the current driving conditions. This allows for flexible adaptation to the protection needs under different driving conditions, achieving effective overcurrent protection for the vehicle and ensuring the safety and performance of vehicle operation.

[0007] In one alternative implementation, the method further includes: In response to the traction control command, the preset maximum overcurrent protection parameter value is obtained; the traction control command is used to characterize the control command triggered when the vehicle is in a restricted operating state; Based on the maximum overcurrent protection parameter value and the reference overcurrent protection parameter, a second overcurrent protection parameter is determined; the second overcurrent protection parameter is used to provide overcurrent protection for the vehicle when it is in a restricted operating state.

[0008] The overcurrent protection parameter determination method provided in this embodiment obtains the preset maximum overcurrent protection parameter value by responding to the escape control command, and determines the corresponding second overcurrent protection parameter based on the maximum overcurrent protection parameter value and the reference overcurrent protection parameter, so that the overcurrent protection constraint can be appropriately relaxed when the vehicle is in a restricted operating state, thereby meeting the protection requirements and operating performance of the vehicle when it is in a restricted operating state.

[0009] In one optional implementation, after determining the second overcurrent protection parameter, the method further includes: In response to the end of the traction command, or when the real-time road surface adhesion coefficient is within the preset adhesion coefficient range, the reference overcurrent protection parameters are adjusted based on the real-time adjustment coefficient to obtain the first overcurrent protection parameters corresponding to the vehicle.

[0010] The overcurrent protection parameter determination method provided in this embodiment identifies whether the vehicle has left the restricted operating state by using the escape termination command or the real-time road surface adhesion coefficient, so as to determine whether it is necessary to switch the overcurrent protection parameters. This ensures a smooth switch of the overcurrent protection parameters between the restricted operating state and the normal control state, thereby restoring the flexibility of adaptively determining the first overcurrent protection parameter based on the real-time road surface condition.

[0011] In one alternative implementation, the method further includes: When a vehicle meets abnormal operating conditions, the reference overcurrent protection parameters are adjusted based on preset adjustment weights to obtain the third overcurrent protection parameters corresponding to the vehicle. The third overcurrent protection parameters are used to provide overcurrent protection for the vehicle when it is under abnormal operating conditions, including the inability to obtain the real-time adhesion coefficient and an abnormality in the vehicle's current sampling circuit.

[0012] The overcurrent protection parameter determination method provided in this embodiment adjusts the baseline overcurrent protection parameters based on preset adjustment weights when the vehicle meets abnormal operating conditions, thereby obtaining the corresponding third overcurrent protection parameters for the vehicle, and executing overcurrent protection based on the third overcurrent protection parameters. Through this method, when the adaptively determined first overcurrent protection parameters cannot be effectively determined or updated, the system can automatically switch to the third overcurrent protection parameters to execute overcurrent protection, thus ensuring that the vehicle can reliably perform overcurrent protection even under abnormal operating conditions.

[0013] In one optional implementation, after obtaining the first overcurrent protection parameters corresponding to the vehicle, the method further includes: When the first overcurrent protection parameter is detected to exceed the preset protection parameter range, the fourth overcurrent protection parameter corresponding to the vehicle is determined within the preset protection parameter range.

[0014] The overcurrent protection parameter determination method provided in this embodiment presets a safety boundary constraint for the first overcurrent protection parameter, and determines the fourth overcurrent protection parameter corresponding to the vehicle within the preset protection parameter range when the first overcurrent protection parameter exceeds the preset protection parameter range, so as to protect the vehicle from overcurrent. This method can ensure the effectiveness and rationality of the overcurrent protection parameter and avoid problems such as overcurrent protection failure or false triggering caused by abnormal first overcurrent protection parameter.

[0015] In one optional implementation, the real-time adhesion coefficient corresponding to the vehicle is obtained, including: Acquire real-time road surface images of the road where the vehicle is located; Based on real-time road surface images, determine the real-time road surface condition where the vehicle is located; The real-time road surface conditions and vehicle wheel speed signals are input into the preset adhesion coefficient estimation model; the wheel speed signals are used to characterize the real-time rotational speed information of each wheel of the vehicle. Obtain the output of the adhesion coefficient estimation model to get the real-time adhesion coefficient.

[0016] The overcurrent protection parameter determination method provided in this embodiment determines the corresponding real-time road surface state through real-time road surface images, and determines the real-time adhesion coefficient based on the real-time road surface state, so that the adhesion coefficient can be dynamically updated as the road surface state changes during vehicle driving, accurately reflecting the vehicle's adhesion capability under the current driving conditions.

[0017] In one optional implementation, after obtaining the first overcurrent protection parameters corresponding to the vehicle, the method further includes: The first overcurrent protection parameter is filtered. The vehicle is protected against overcurrent using the first overcurrent protection parameter after filtering.

[0018] The overcurrent protection parameter determination method provided in this embodiment can filter the first overcurrent protection parameter to obtain a smoothed first overcurrent protection parameter, thereby avoiding sudden changes caused by instantaneous fluctuations in the real-time road surface adhesion coefficient, thus improving the stability of the overcurrent protection parameter and enhancing the reliable execution of overcurrent protection under different driving conditions.

[0019] In one optional implementation, the reference overcurrent protection parameters are adjusted based on a real-time adjustment coefficient to obtain the first overcurrent protection parameters corresponding to the vehicle, including: The first overcurrent protection parameter corresponding to the vehicle is obtained by multiplying the real-time adjustment coefficient with the reference overcurrent protection parameter.

[0020] The overcurrent protection parameter determination method provided in this embodiment obtains the first overcurrent protection parameter by multiplying the real-time adjustment coefficient with the reference overcurrent protection parameter. This method can take into account the current driving conditions of the vehicle and improve the adaptability of the overcurrent protection parameter to different driving conditions.

[0021] In a second aspect, the present invention provides a power isolation device, the device comprising: The acquisition module is used to acquire the real-time adhesion coefficient of the vehicle; the real-time adhesion coefficient is determined based on the real-time road conditions of the vehicle. The adjustment module is used to determine the real-time adjustment coefficient corresponding to the real-time road surface adhesion coefficient according to the preset mapping table between the adhesion coefficient and the adjustment coefficient; the real-time adjustment coefficient represents the degree of adjustment of the reference overcurrent protection parameters based on the real-time road surface adhesion coefficient. The parameter determination module is used to adjust the reference overcurrent protection parameters based on the real-time adjustment coefficient to obtain the first overcurrent protection parameters corresponding to the vehicle; the first overcurrent protection parameters are used to provide overcurrent protection for the vehicle when it is in a normal control state.

[0022] Thirdly, the present invention provides a vehicle including a power isolation device. The microcontroller in the power isolation device includes a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to perform the overcurrent protection parameter determination method of the first aspect or any corresponding embodiment described above.

[0023] Fourthly, the present invention provides a computer-readable storage medium storing computer instructions for causing a computer to execute the overcurrent protection parameter determination method of the first aspect or any corresponding embodiment thereof.

[0024] Fifthly, the present invention provides a computer program product, including computer instructions, which are used to cause a computer to execute the overcurrent protection parameter determination method of the first aspect or any corresponding embodiment thereof.

[0025] It should be understood that the beneficial effects of the power isolation device, vehicle, storage medium, and program product involved in the embodiments of the present invention can be found in the corresponding beneficial effect description of the overcurrent protection parameter determination method shown above, and will not be repeated here. Attached Figure Description

[0026] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0027] Figure 1 This is a schematic diagram of the first method for determining overcurrent protection parameters according to an embodiment of the present invention; Figure 2 This is a schematic diagram of the second process for determining overcurrent protection parameters according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the third process of the overcurrent protection parameter determination method according to an embodiment of the present invention; Figure 4 This is a structural block diagram of a power isolation device according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the hardware structure of the microcontroller in the power isolation device according to an embodiment of the present invention. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0029] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0030] To prevent damage to electrical components or system failures due to abnormally high current, appropriate overcurrent protection mechanisms are typically implemented in the power network guardian (PNG). These mechanisms usually employ fixed overcurrent protection parameters, such as a fixed overcurrent protection threshold (e.g., 150% of rated current), a fixed overcurrent protection delay time (e.g., 10 seconds), and a fixed short-circuit protection response threshold. However, actual driving conditions are complex and varied, and the dynamic electrical requirements of vehicles differ significantly under different road surface conditions.

[0031] Specifically, when a vehicle is on a dry road surface with a high coefficient of friction, and is accelerating or decelerating rapidly, the drive motor requires a large instantaneous current (the peak value can be several times the rated current). At this time, the overcurrent protection parameters should allow a large current to pass through briefly in order to ensure the normal power output of the vehicle.

[0032] When a vehicle is on a surface with a low coefficient of friction, such as wet, slippery, or icy roads, the high torque output of the drive motor can actually cause the tires to slip. The ASR / ESP system will actively limit the motor output current. If an unexpected large current surge occurs (such as a current spike generated when the wheel suddenly grips the ground after slipping), the PNG system needs to be more sensitive to perform overcurrent protection to prevent the high-voltage lines from overheating or being damaged.

[0033] When a vehicle is in off-road or getting out of trouble, the driver may need a short-term limit current output to get out of trouble. At this time, the protection parameters should be temporarily relaxed to avoid the vehicle losing power and getting stuck due to false protection.

[0034] The use of fixed overcurrent protection parameters in existing overcurrent protection mechanisms fails to meet the protection needs under different driving conditions. Specifically, during vehicle operation, fixed overcurrent protection parameters may have an overly wide setting range, leading to delayed overcurrent fault response. This can cause the vehicle's power supply circuit and related electrical components to be subjected to abnormal current for extended periods, increasing the risk of electrical fires. Alternatively, overly strict setting ranges may trigger protection actions prematurely when the vehicle has high power demands, limiting vehicle power output and affecting normal vehicle operation. For example, when the vehicle is in a driving scenario requiring significant power output (such as getting out of trouble on slippery roads or climbing hills on snow), fixed overcurrent protection parameters may not be able to adjust according to actual operating needs, causing premature protection activation and limiting the vehicle's power output. Therefore, the use of fixed overcurrent protection parameters in existing overcurrent protection mechanisms lacks the ability to perceive changes in the external environment (such as road conditions) and cannot dynamically adjust overcurrent protection parameters according to real-time driving conditions. This results in insufficient adaptability of the overcurrent protection mechanism, limiting the safety and performance of vehicle operation.

[0035] Therefore, this invention provides a method for determining vehicle overcurrent protection parameters. By obtaining the real-time road surface condition corresponding to the vehicle in real time, the real-time adhesion coefficient is determined, which can reflect the vehicle's adhesion capability under the current driving conditions. Based on the real-time adhesion coefficient corresponding to the real-time driving conditions, the reference overcurrent protection parameters are adjusted to obtain the first overcurrent protection parameters adapted to the current driving conditions, so as to meet the protection requirements under different driving conditions and thus ensure the safety and performance of vehicle operation.

[0036] According to an embodiment of the present invention, a method for determining vehicle overcurrent protection parameters is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0037] This embodiment provides a method for determining vehicle overcurrent protection parameters, which can be used in vehicle power isolation devices. Figure 1 This is a flowchart of a method for determining vehicle overcurrent protection parameters according to an embodiment of the present invention, such as... Figure 1 As shown, the process includes the following steps: Step S101: Obtain the real-time adhesion coefficient corresponding to the vehicle; the real-time adhesion coefficient is determined based on the real-time road conditions of the vehicle.

[0038] The coefficient of adhesion (COP) characterizes the adhesion between a vehicle's wheels and the road surface, reflecting the wheels' ability to resist slippage during driving or braking. The real-time COP is a parameter estimated in real-time based on the vehicle's current driving conditions (i.e., the real-time road surface condition), used to characterize the actual adhesion of the road surface at the current moment. The real-time road surface condition characterizes features of the road surface, such as its dryness / wetness, snow or ice accumulation, etc.

[0039] Optionally, the power isolation device can obtain the real-time adhesion coefficient output by the vehicle controller through the vehicle communication network; or, it can receive a real-time road surface image of the vehicle's location sent by the vehicle controller to further determine the vehicle's current real-time adhesion coefficient.

[0040] Since different road conditions can cause changes in the adhesion between the wheels and the current road surface, this application determines the vehicle's real-time adhesion coefficient based on the real-time road conditions. This reflects the vehicle's adhesion under the current driving conditions, thereby enabling the adjustment of the reference overcurrent protection parameters based on the real-time adhesion coefficient corresponding to the real-time driving conditions, thus improving the flexibility and universality of overcurrent protection parameter determination.

[0041] Step S102: Determine the real-time adjustment coefficient corresponding to the real-time road surface adhesion coefficient according to the preset mapping table between the adhesion coefficient and the adjustment coefficient; the real-time adjustment coefficient is used to characterize the degree of adjustment of the reference overcurrent protection parameters based on the real-time road surface adhesion coefficient.

[0042] Overcurrent protection parameters include overcurrent protection threshold and protection delay time. Further, reference overcurrent protection parameters include reference overcurrent protection threshold and reference protection delay time. The reference overcurrent protection parameters can serve as a reference for determining the first overcurrent protection parameter. Optionally, the specific values ​​of the reference overcurrent protection parameters can be configured during the vehicle design calibration stage based on actual application conditions such as vehicle model, electrical system configuration, voltage platform parameters, and overcurrent protection requirements. For example, the reference overcurrent protection threshold can be set to 150% of the rated current, and the reference protection delay time can be set to 2 seconds.

[0043] For example, the mapping table between the adhesion coefficient and the adjustment coefficient can be shown in the table below.

[0044]

[0045] In this embodiment, the adjustment coefficients include a first adjustment coefficient and a second adjustment coefficient. The first adjustment coefficient characterizes the degree of adjustment to the reference overcurrent protection threshold, and the second adjustment coefficient characterizes the degree of adjustment to the reference protection delay time. The specific values ​​of the first and second adjustment coefficients corresponding to each attachment coefficient range can be set according to actual application conditions such as vehicle model, electrical system configuration, and voltage platform to meet the adjustment requirements of the reference overcurrent protection parameters under different vehicle application scenarios.

[0046] Optionally, the real-time adjustment coefficient includes a first real-time adjustment coefficient and a second real-time adjustment coefficient. After determining the real-time road surface adhesion coefficient, the first real-time adjustment coefficient and the second real-time adjustment coefficient corresponding to the real-time road surface adhesion coefficient can be obtained by querying the above mapping table.

[0047] Step S103: Adjust the reference overcurrent protection parameter based on the real-time adjustment coefficient to obtain the first overcurrent protection parameter corresponding to the vehicle; the first overcurrent protection parameter is used to provide overcurrent protection for the vehicle when the vehicle is in normal control state.

[0048] Adjusting the reference overcurrent protection parameters means adjusting or correcting the reference overcurrent protection parameters proportionally according to the real-time adjustment coefficient corresponding to the real-time adhesion coefficient, so as to obtain the first overcurrent protection parameters adapted to the current vehicle driving conditions. The first overcurrent protection parameters include the first overcurrent protection threshold and the first protection delay time.

[0049] Specifically, based on the aforementioned mapping table, the first and second real-time adjustment coefficients corresponding to the real-time adhesion coefficient are determined. The reference overcurrent protection threshold is adjusted based on the first real-time adjustment coefficient to obtain a first overcurrent protection threshold applicable to the current driving condition. Similarly, the reference protection delay time is adjusted based on the second real-time adjustment coefficient to obtain a first protection delay time applicable to the current driving condition. When the vehicle is in normal control mode, the corresponding overcurrent protection mechanism can be executed based on the first overcurrent protection threshold and the first protection delay time to achieve overcurrent protection for the vehicle. Through this method, the first overcurrent protection parameters can dynamically change with real-time road conditions, thus obtaining first overcurrent protection parameters that are flexibly applicable to different driving conditions.

[0050] In some optional implementations, the corresponding overcurrent protection mechanism based on the first overcurrent protection threshold and the first protection delay time includes: The vehicle's current sampling circuit samples the main circuit current in real time at a preset sampling period to obtain the actual value of the main circuit current at the current moment. The preset sampling period can be 10ms. The actual value of the main circuit current is compared with the first overcurrent protection threshold. When the actual value of the main circuit current is greater than the first overcurrent protection threshold, the overcurrent duration timer is started to accumulate the time for the actual value of the main circuit current to exceed the first overcurrent protection threshold. When the actual value of the main circuit current is less than or equal to the first overcurrent protection threshold, the timing is stopped or the timer is cleared. If the accumulated time is detected to exceed the first protection delay time, an overcurrent fault is immediately determined to have occurred, the main relay is disconnected, and the corresponding overcurrent fault information or fault code is reported.

[0051] The overcurrent protection parameter determination method provided in this embodiment can reflect the vehicle's adhesion capability under the current driving conditions by determining the real-time adhesion coefficient based on the real-time road conditions corresponding to the vehicle. Then, the reference overcurrent protection parameters can be adjusted by using the real-time adhesion coefficient that conforms to the current driving conditions to obtain the first overcurrent protection parameters adapted to the current driving conditions. This allows for flexible adaptation to the protection needs under different driving conditions, achieving effective overcurrent protection for the vehicle and ensuring the safety and performance of vehicle operation.

[0052] This embodiment provides a method for determining vehicle overcurrent protection parameters, which can be used in vehicle power isolation devices. Figure 2 This is a flowchart of a method for determining vehicle overcurrent protection parameters according to an embodiment of the present invention, such as... Figure 2 As shown, the process includes the following steps: Step S201: Obtain the real-time adhesion coefficient corresponding to the vehicle; the real-time adhesion coefficient is determined based on the real-time road conditions of the vehicle.

[0053] Specifically, step S201 includes: Step S2011: Obtain a real-time road surface image of the road surface where the vehicle is located.

[0054] Optionally, an image acquisition device installed on the vehicle can be used to acquire real-time images of the road area where the vehicle is traveling, thereby obtaining real-time road surface images that include the features of the road surface where the vehicle is currently traveling.

[0055] Step S2012: Determine the real-time road surface condition of the vehicle based on the real-time road surface image.

[0056] For example, real-time road surface images can be input into a pre-defined image classification model or feature matching model to obtain the real-time road surface state of the vehicle. Specifically, the sampling image classification model or feature matching model extracts features from the road surface region in the real-time road surface image to obtain image feature information characterizing the road surface state; the image feature information is analyzed, and the analysis results are matched with pre-established feature information corresponding to different road surface states to determine the current real-time road surface state of the vehicle. For example, analyzing the image feature information can yield information such as brightness variation features, texture features, color features, and reflection features. The feature information obtained from the above analysis is matched with pre-established feature information corresponding to different road surface states to determine the real-time road surface state.

[0057] Step S2013: Input the real-time road surface condition and the vehicle's wheel speed signal into the preset adhesion coefficient estimation model; the wheel speed signal is used to characterize the real-time rotational speed information of each wheel of the vehicle.

[0058] The vehicle's slip ratio is determined based on the vehicle's wheel speed signal. Optionally, the slip ratio is calculated based on the difference between the actual wheel rotation speed and the vehicle's travel speed. This slip ratio characterizes the degree of mismatch between the wheel rotation motion and the vehicle's actual motion. The real-time road surface condition and the slip ratio are input into a preset adhesion coefficient estimation model to obtain the adhesion coefficient estimation result. The adhesion coefficient estimation model is mainly used to estimate the adhesion capability between the wheel and the road surface based on the input information and output the corresponding adhesion coefficient. Related adhesion coefficient estimation models have been applied in the field of vehicle control and can be implemented using vehicle dynamics models, filtered estimation models, or data-driven models, etc. This embodiment does not specifically limit the specific implementation of these models.

[0059] Step S2014: Obtain the output results of the adhesion coefficient estimation model to obtain the real-time adhesion coefficient.

[0060] Obtain the output results corresponding to the adhesion coefficient estimation model, and determine the output results as the real-time adhesion coefficient of the vehicle.

[0061] In some alternative implementations, the power isolation device can directly obtain the real-time adhesion coefficient corresponding to the vehicle determined by the vehicle controller. Specifically, the vehicle controller executes steps (1) to (3) at a fixed period (e.g., 50ms).

[0062] (1) Obtain the front-view camera image of the vehicle to obtain the real-time road surface image of the road surface where the vehicle is located; based on the real-time road surface image, determine the real-time road surface state where the vehicle is located.

[0063] (2) Input the real-time road surface condition and the vehicle wheel speed signal into the preset adhesion coefficient estimation model, and output the real-time adhesion coefficient corresponding to the vehicle (the real-time adhesion coefficient ranges from 0.1 to 1.0).

[0064] (3) Pack the real-time adhesion coefficient and real-time road surface condition into a road surface condition message, send it to the vehicle communication network via CAN FD, and then transmit it to the power isolation device. The message period is 50ms.

[0065] Furthermore, the power isolation device continuously monitors road condition messages through the CAN and CAN FD bus interfaces and performs the following steps (4) to (6).

[0066] (4) Verify the message ID and CRC to ensure that the source of the road condition message is reliable.

[0067] (5) Extract the real-time adhesion coefficient and real-time road surface status from the road surface status message and store them in the internal cache.

[0068] (6) Perform a reasonableness check on the real-time adhesion coefficient and real-time road surface condition (e.g., the real-time adhesion coefficient should be between 0.1 and 1.0). If the road surface condition message fails to be received or the data is abnormal for 10 consecutive message cycles (t_dly_protect), a communication fault is reported and the vehicle is determined to be in an abnormal operating state. At this time, the reference overcurrent protection parameter is adjusted based on the preset adjustment weight to obtain the third overcurrent protection parameter corresponding to the vehicle, and the third overcurrent protection parameter is used to protect the vehicle from overcurrent.

[0069] The overcurrent protection parameter determination method provided in this embodiment determines the corresponding real-time road surface state through real-time road surface images, and determines the real-time adhesion coefficient based on the real-time road surface state, so that the adhesion coefficient can be dynamically updated as the road surface state changes during vehicle driving, accurately reflecting the vehicle's adhesion capability under the current driving conditions.

[0070] Step S202: Based on a preset mapping table between adhesion coefficients and adjustment coefficients, determine the real-time adjustment coefficient corresponding to the real-time road surface adhesion coefficient. The real-time adjustment coefficient characterizes the degree of adjustment of the reference overcurrent protection parameters based on the real-time road surface adhesion coefficient. For details, please refer to [link to relevant documentation]. Figure 1Step S102 of the illustrated embodiment will not be described again here.

[0071] Step S203: Adjust the reference overcurrent protection parameter based on the real-time adjustment coefficient to obtain the first overcurrent protection parameter corresponding to the vehicle; the first overcurrent protection parameter is used to provide overcurrent protection for the vehicle when the vehicle is in normal control state.

[0072] Specifically, step S203 includes: Step S2031: Multiply the real-time adjustment coefficient with the reference overcurrent protection parameter to obtain the first overcurrent protection parameter corresponding to the vehicle.

[0073] Optionally, the real-time adjustment coefficient includes a first real-time adjustment coefficient and a second real-time adjustment coefficient. Based on the mapping table between the adhesion coefficient and the adjustment coefficient mentioned above, the first real-time adjustment coefficient and the second real-time adjustment coefficient corresponding to the real-time road adhesion coefficient are determined. The reference overcurrent protection threshold is adjusted using the first real-time adjustment coefficient to obtain a first overcurrent protection threshold applicable to the current driving conditions. The first overcurrent protection threshold... The process of determining is as follows: .

[0074] in, This is the first real-time adjustment coefficient. The reference overcurrent protection threshold is used.

[0075] The reference protection delay time is adjusted using a second real-time adjustment coefficient to obtain a first protection delay time suitable for the current driving conditions. The first protection delay time... The process of determining is as follows: .

[0076] in, This is the second real-time adjustment coefficient. The reference protection delay time.

[0077] The overcurrent protection parameter determination method provided in this embodiment obtains the first overcurrent protection parameter by multiplying the real-time adjustment coefficient with the reference overcurrent protection parameter. This method can take into account the current driving conditions of the vehicle and improve the adaptability of the overcurrent protection parameter to different driving conditions.

[0078] In some optional implementations, after step S203, the method further includes: Step a1: When the first overcurrent protection parameter is detected to exceed the preset protection parameter range, the fourth overcurrent protection parameter corresponding to the vehicle is determined within the preset protection parameter range.

[0079] Optionally, the preset protection parameter range includes an overcurrent threshold range and a delay time range, which can be set based on a reference overcurrent protection threshold and a reference protection delay time, respectively. For example, the overcurrent threshold range can be set to [0.5*]. 1.8* The delay time range can be set to [0.5*]. , 4* ].

[0080] When the first overcurrent protection parameter exceeds the preset protection parameter range, the corresponding fourth overcurrent protection parameter is determined within the preset protection parameter range. Simultaneously, the corresponding over-limit event is recorded for subsequent system diagnostics or calibration analysis. The fourth overcurrent protection parameter includes a fourth overcurrent protection threshold and a fourth protection delay time.

[0081] For example, if the first overcurrent protection threshold is greater than the upper limit of the overcurrent threshold range, a fourth overcurrent protection threshold is obtained by constraining the first overcurrent protection threshold. For instance, the upper limit of the overcurrent threshold range is set as the fourth overcurrent protection threshold, or the upper limit is scaled using a preset scaling factor to obtain the fourth overcurrent protection threshold. If the first overcurrent protection threshold is less than the lower limit of the overcurrent threshold range, the lower limit of the overcurrent threshold range is set as the fourth overcurrent protection threshold, or the lower limit is scaled using a preset scaling factor to obtain the fourth overcurrent protection threshold, ensuring that the fourth overcurrent protection threshold is within the overcurrent threshold range.

[0082] The overcurrent protection parameter determination method provided in this embodiment presets a safety boundary constraint for the first overcurrent protection parameter, and determines the fourth overcurrent protection parameter corresponding to the vehicle within the preset protection parameter range when the first overcurrent protection parameter exceeds the preset protection parameter range, so as to protect the vehicle from overcurrent. This method can ensure the effectiveness and rationality of the overcurrent protection parameter and avoid problems such as overcurrent protection failure or false triggering caused by abnormal first overcurrent protection parameter.

[0083] In some optional implementations, after step S203, the method further includes: Step S204: Filter the first overcurrent protection parameter.

[0084] Optionally, to prevent the first overcurrent protection parameter from drastically oscillating due to sudden changes in the real-time adhesion coefficient, the first overcurrent protection parameter is filtered to smooth and optimize it. Specifically, the current first overcurrent protection parameter can be used as the input signal X(n), and the filtered output from the previous moment, i.e., the smoothed first overcurrent protection parameter output from the previous calculation cycle, can be used as the historical state value Y(n-1). The filtered output signal Y(n) is obtained based on the following filtering process: .

[0085] in, This is the filtering coefficient, which can be set according to the actual situation. In this embodiment, it can be set to 0.2.

[0086] Step S205: Use the filtered first overcurrent protection parameters to perform overcurrent protection on the vehicle.

[0087] The filtered output signal Y(n), which is also the filtered first overcurrent protection parameter, is used as the smoothed first overcurrent protection parameter. This smoothed first overcurrent protection parameter is then used to provide overcurrent protection for the vehicle.

[0088] The overcurrent protection parameter determination method provided in this embodiment can filter the first overcurrent protection parameter to obtain a smoothed first overcurrent protection parameter, thereby avoiding sudden changes caused by instantaneous fluctuations in the real-time road surface adhesion coefficient, thus improving the stability of the overcurrent protection parameter and enhancing the reliable execution of overcurrent protection under different driving conditions.

[0089] This embodiment provides a method for determining vehicle overcurrent protection parameters, which can be used in vehicle power isolation devices. Figure 3 This is a flowchart of a method for determining vehicle overcurrent protection parameters according to an embodiment of the present invention, such as... Figure 3 As shown, the process includes the following steps: Step S301: Obtain the real-time adhesion coefficient corresponding to the vehicle; the real-time adhesion coefficient is determined based on the real-time road conditions where the vehicle is located. For details, please refer to [link to relevant documentation]. Figure 2 Step S201 of the illustrated embodiment will not be described again here.

[0090] Determine the vehicle's operating status. If the vehicle is in a normal control state, execute steps S302 to S304; if the vehicle is in a restricted operating state, execute steps S305 to S307; if the vehicle is in an abnormal operating state, execute step S308.

[0091] Step S302: Based on a preset mapping table between adhesion coefficients and adjustment coefficients, determine the real-time adjustment coefficient corresponding to the real-time road surface adhesion coefficient. The real-time adjustment coefficient characterizes the degree of adjustment of the reference overcurrent protection parameters based on the real-time road surface adhesion coefficient. For details, please refer to [link to relevant documentation]. Figure 1 Step S102 of the illustrated embodiment will not be described again here.

[0092] Step S303: Adjust the reference overcurrent protection parameters based on the real-time adjustment coefficient to obtain the first overcurrent protection parameters corresponding to the vehicle; the first overcurrent protection parameters are used to provide overcurrent protection for the vehicle when it is in normal control mode. For details, please refer to [link to relevant documentation]. Figure 2Step S203 of the illustrated embodiment will not be described again here.

[0093] Step S304: Filter the first overcurrent protection parameters; use the filtered first overcurrent protection parameters to provide overcurrent protection for the vehicle. For details, please refer to [link to relevant documentation]. Figure 2 Steps S204 to S205 of the illustrated embodiment will not be described again here.

[0094] Step S305: In response to the traction control command, obtain the preset maximum overcurrent protection parameter value; the traction control command is used to characterize the control command triggered when the vehicle is in a restricted operating state.

[0095] When the vehicle is in a restricted operating state, such as starting on snow, off-road extrication, or off-road slippage, the driver can press a preset extrication control button. Alternatively, the vehicle controller can trigger an extrication control command when it detects that the vehicle is stuck in a low-traction area and the driver continuously applies high throttle (throttle opening >80% for 2 seconds). In response to the extrication control command, the power isolation device can acquire a preset maximum overcurrent protection parameter value. This maximum overcurrent protection parameter value can be used to limit the upper limit of the permissible overcurrent protection parameters under special driving conditions, thereby improving the vehicle's ability to pass under extreme power output demands. The maximum overcurrent protection parameter value includes a maximum overcurrent protection threshold and a maximum protection delay time.

[0096] Step S306: Determine the second overcurrent protection parameter based on the maximum overcurrent protection parameter value and the reference overcurrent protection parameter; the second overcurrent protection parameter is used to provide overcurrent protection for the vehicle when the vehicle is in a restricted operating state.

[0097] Optionally, the second overcurrent protection parameter includes a second overcurrent protection threshold and a second protection delay time. Upon receiving the escape control command, the second overcurrent protection threshold is determined based on the following formula. : .

[0098] in, This is the maximum overcurrent protection threshold.

[0099] The second protection delay time is determined based on the following formula. : .

[0100] in, This is the maximum protection delay time.

[0101] Furthermore, the vehicle's current sampling circuit samples the main circuit current in real time. In response to the escape control command, it compares the actual value of the main circuit current with the first overcurrent protection threshold. When the actual value of the main circuit current is greater than the second overcurrent protection threshold, an overcurrent duration timer is started to accumulate the time for which the actual value of the main circuit current exceeds the second overcurrent protection threshold. When the actual value of the main circuit current is less than or equal to the second overcurrent protection threshold, the timer is stopped or the timer is reset to zero. If the accumulated time is detected to exceed the second protection delay time, an overcurrent fault is immediately determined, and the main relay and other protection operations are disconnected. At the same time, the corresponding overcurrent fault information or fault code is reported.

[0102] The overcurrent protection parameter determination method provided in this embodiment obtains the preset maximum overcurrent protection parameter value by responding to the escape control command, and determines the corresponding second overcurrent protection parameter based on the maximum overcurrent protection parameter value and the reference overcurrent protection parameter, so that the overcurrent protection constraint can be appropriately relaxed when the vehicle is in a restricted operating state, thereby meeting the protection requirements and operating performance of the vehicle when it is in a restricted operating state.

[0103] Step S307: In response to the end of the traction command, or when the real-time road surface adhesion coefficient is within the preset adhesion coefficient range, the reference overcurrent protection parameter is adjusted based on the real-time adjustment coefficient to obtain the first overcurrent protection parameter corresponding to the vehicle.

[0104] Optionally, the vehicle is determined to have left the restricted operating state and entered the normal control state under the following circumstances: (1) When the vehicle driver presses the preset escape end button, triggering the escape end command.

[0105] (2) When the real-time road surface adhesion coefficient is detected to be within the preset adhesion coefficient range, the vehicle is determined to be in an unrestricted operating state.

[0106] (3) When it is determined that the vehicle speed exceeds the preset speed threshold (e.g., 10 km / h).

[0107] (4) When the motor current of the vehicle is lower than the preset current threshold (e.g., 0.8×I_base) for a continuous preset time (e.g., 5s).

[0108] After determining that the vehicle has left the restricted operating state and entered the normal control state, steps S302 to S304 are executed to determine the first overcurrent protection parameter that matches the current normal control state, and then the vehicle is protected against overcurrent.

[0109] The overcurrent protection parameter determination method provided in this embodiment identifies whether the vehicle has left the restricted operating state by using the escape termination command or the real-time road surface adhesion coefficient, so as to determine whether it is necessary to switch the overcurrent protection parameters. This ensures a smooth switch of the overcurrent protection parameters between the restricted operating state and the normal control state, thereby restoring the flexibility of adaptively determining the first overcurrent protection parameter based on the real-time road surface condition.

[0110] Step S308: When the vehicle meets the abnormal operating conditions, the reference overcurrent protection parameter is adjusted based on the preset adjustment weight to obtain the third overcurrent protection parameter corresponding to the vehicle. The third overcurrent protection parameter is used to protect the vehicle from overcurrent when the vehicle is under abnormal operating conditions. Abnormal operating conditions include the inability to obtain the real-time adhesion coefficient and the abnormality of the vehicle's current sampling circuit.

[0111] Optionally, if the power isolation device fails to receive a valid road condition message for 10 consecutive message cycles, or if the power isolation device detects an abnormality in the current sampling circuit or an excessive internal temperature, it determines that the vehicle meets abnormal operating conditions. In this case, it stops adaptive adjustment based on the real-time adhesion coefficient and switches to a safe conservative mode, forcibly locking the overcurrent protection parameter to the third overcurrent protection parameter to improve the response sensitivity of the overcurrent protection. Simultaneously, the driver is notified via the instrument panel that the vehicle has entered conservative protection mode. After the abnormal operating state of the vehicle is resolved, the corresponding first overcurrent protection parameter is re-determined based on the real-time road condition and the real-time adhesion coefficient.

[0112] The third overcurrent protection parameters include the third overcurrent protection threshold and the third protection delay time. When it is determined that the vehicle meets abnormal operating conditions, the third overcurrent protection threshold is determined based on the following formula. : .

[0113] The third protection delay time is determined based on the following formula. : .

[0114] Furthermore, the vehicle's current sampling circuit samples the main circuit current in real time. When it is determined that the vehicle meets the abnormal operating conditions, the actual value of the main circuit current is compared with the third overcurrent protection threshold. When the actual value of the main circuit current is detected to exceed the third overcurrent protection threshold, the overcurrent duration timer is started. If the time for the actual value of the main circuit current to exceed the third overcurrent protection threshold reaches the third protection delay time, an overcurrent fault is determined to have occurred, and the main relay and other protection operations are disconnected. At the same time, the corresponding overcurrent fault information or fault code is reported to ensure that the vehicle can still reliably perform overcurrent protection under abnormal operating conditions.

[0115] The overcurrent protection parameter determination method provided in this embodiment adjusts the baseline overcurrent protection parameters based on preset adjustment weights when the vehicle meets abnormal operating conditions, thereby obtaining the corresponding third overcurrent protection parameters for the vehicle, and executing overcurrent protection based on the third overcurrent protection parameters. Through this method, when the adaptively determined first overcurrent protection parameters cannot be effectively determined or updated, the system can automatically switch to the third overcurrent protection parameters to execute overcurrent protection, thus ensuring that the vehicle can reliably perform overcurrent protection even under abnormal operating conditions.

[0116] The overcurrent protection parameter determination method provided in this embodiment employs a first overcurrent protection parameter, a second overcurrent protection parameter, and a third overcurrent protection parameter to perform overcurrent protection according to different operating states of the vehicle. This ensures that the vehicle can use overcurrent protection parameters that match the current operating state under different driving conditions, such as normal control state, restricted operating state, and abnormal operation. This avoids the problem that using a single fixed overcurrent protection parameter is insufficient to meet the protection needs of different driving conditions, and improves the adaptability of the overcurrent protection mechanism based on sampled overcurrent protection parameters to complex driving scenarios. Specifically, in the normal control state, the first overcurrent protection parameter is dynamically determined based on the real-time adhesion coefficient to improve the matching between the overcurrent protection mechanism and the real-time driving conditions of the vehicle; in the restricted operating state, the second overcurrent protection parameter is used to perform overcurrent protection to balance power output requirements and overcurrent protection requirements; and in the abnormal operating state, the third overcurrent protection parameter is used to perform overcurrent protection to ensure the continuity and reliability of the overcurrent protection function.

[0117] In some specific implementations, taking a rapid acceleration scenario on icy or snowy roads as an example, when a vehicle is traveling on an icy or snowy road, the vehicle controller or the microcontroller of the power isolation device detects that the real-time road condition is Road_Type=Ice, and the corresponding real-time adhesion coefficient of the vehicle... Then, the power isolation device automatically adjusts the real-time overcurrent protection threshold to the first overcurrent protection threshold, i.e. The real-time protection delay time is adjusted to the first protection delay time. The driver suddenly pressed the accelerator, causing the motor controller to request a large current, but the ASR system quickly intervened, limiting the peak current to no more than 0.5* Overcurrent protection was not triggered. Meanwhile, due to the shortened delay time, if a genuine line short-circuit fault occurs (current suddenly increases to 1.2*), the overcurrent protection will be activated. Power isolation devices can The internal rapid disconnection prevents the line from overheating, which can improve the high-voltage safety redundancy while ensuring drivability on icy and snowy roads.

[0118] Take an emergency avoidance scenario on a dry road surface as an example. The vehicle is on a dry asphalt road surface; at this time, the vehicle's real-time coefficient of friction is... The power isolation device automatically adjusts the real-time overcurrent protection threshold to the first overcurrent protection threshold, i.e. The real-time protection delay time is adjusted to the first protection delay time. The driver slammed on the accelerator to avoid an obstacle, causing the motor's instantaneous current to reach [a certain value]. At this point, traditional protection may have already triggered a disconnection (if the traditional overcurrent protection threshold is set to...). This solution allows the current to continue. The motor outputs sufficient peak torque to complete the obstacle avoidance maneuver. After the obstacle avoidance, the current drops back down, the protection is not triggered, and the vehicle's maximum power is released, improving the vehicle's emergency avoidance capability.

[0119] Furthermore, let's take an extreme output scenario under restricted operating conditions as an example. The vehicle is stuck in a snowdrift, and the driver presses the escape control button to trigger the escape control command. In response to the escape control command, the power isolation device forcibly adjusts the real-time overcurrent protection threshold to the second overcurrent protection threshold, i.e. And adjust the real-time protection delay time to the second protection delay time. The driver repeatedly pressed the accelerator in an attempt to escape the restricted operating state, and the motor repeatedly output greater than [a certain value]. The inrush currents did not trigger the protection, allowing the vehicle to successfully exit the restricted operating state. After the vehicle exited the restricted operating state, the speed increased to 12km / h, and it was determined that the vehicle had exited the restricted operating state and entered the normal control state. That is, the first overcurrent protection parameter matching the current normal control state was adaptively determined based on the real-time adhesion coefficient.

[0120] The overcurrent protection parameter determination method provided in this embodiment determines the vehicle's first overcurrent protection parameter based on the real-time adhesion coefficient. This allows the overcurrent protection parameter to be dynamically adjusted according to different driving conditions, improving the matching degree between the overcurrent protection mechanism and the actual operating state of the vehicle. It reduces unnecessary protection actions caused by unreasonable protection parameter settings and balances vehicle power performance with overcurrent protection performance. Specifically, under different road surface adhesion conditions, the overcurrent protection parameter can be adaptively adjusted based on the real-time adhesion coefficient. For example, on low-adhesion roads, the sensitivity of the overcurrent protection parameter can be actively increased to reduce the risk of vehicle fires caused by wiring hazards; on high-adhesion roads, the overcurrent protection parameter can be appropriately relaxed to avoid power interruption during emergency avoidance. Real-world data shows that in emergency acceleration scenarios on dry roads, the false triggering rate of overcurrent protection is reduced by approximately 80%. When the vehicle is in a restricted operating state, it can switch to the corresponding second overcurrent protection parameter to appropriately increase the vehicle's short-term power output capability and improve its passability under special conditions. When the vehicle is in an abnormal operating state such as communication failure or sensor failure, it can automatically switch to the corresponding third overcurrent protection parameter to ensure the continuity and reliability of the overcurrent protection function. Furthermore, since the overcurrent protection parameters can be reasonably adjusted according to the actual operating conditions of the vehicle, the frequent protection actions caused by the mismatch between the protection parameters and the vehicle's operating conditions are reduced. This helps to reduce the electrical shock to power devices such as relays and MOSFETs, improve the operational reliability and service life of the power isolation device, and reduce the vehicle's maintenance costs.

[0121] This embodiment also provides a power isolation device for implementing the above embodiments and preferred embodiments; details already described will not be repeated. As used below, the term "module" can refer to a combination of software and / or hardware that performs a predetermined function. Although the devices described in the following embodiments are preferably implemented in software, hardware implementations, or a combination of software and hardware, are also possible and contemplated.

[0122] This embodiment provides a power isolation device, such as Figure 4 As shown, it includes: The acquisition module 401 is used to acquire the real-time adhesion coefficient corresponding to the vehicle; the real-time adhesion coefficient is determined based on the real-time road conditions where the vehicle is located. The adjustment module 402 is used to determine the real-time adjustment coefficient corresponding to the real-time road surface adhesion coefficient according to the preset mapping table between the adhesion coefficient and the adjustment coefficient; the real-time adjustment coefficient represents the degree of adjustment of the reference overcurrent protection parameter based on the real-time road surface adhesion coefficient. The parameter determination module 403 is used to adjust the reference overcurrent protection parameters based on the real-time adjustment coefficient to obtain the first overcurrent protection parameters corresponding to the vehicle; the first overcurrent protection parameters are used to provide overcurrent protection for the vehicle when the vehicle is in a normal control state.

[0123] In some alternative implementations, the power isolation device further includes: The traction control parameter determination module is used to obtain a preset maximum overcurrent protection parameter value in response to the traction control command; the traction control command is used to characterize the control command triggered when the vehicle is in a restricted operating state; based on the maximum overcurrent protection parameter value and the reference overcurrent protection parameter, a second overcurrent protection parameter is determined; the second overcurrent protection parameter is used to provide overcurrent protection for the vehicle when it is in a restricted operating state.

[0124] In some optional implementations, the traction parameter determination module is also used to respond to the traction termination command, or, when the real-time road surface adhesion coefficient is within a preset adhesion coefficient range, to adjust the reference overcurrent protection parameter based on the real-time adjustment coefficient to obtain the first overcurrent protection parameter corresponding to the vehicle.

[0125] In some alternative implementations, the power isolation device further includes: The abnormal operation parameter determination module is used to adjust the reference overcurrent protection parameter based on a preset adjustment weight when the vehicle meets the abnormal operation conditions, so as to obtain the third overcurrent protection parameter corresponding to the vehicle. The third overcurrent protection parameter is used to provide overcurrent protection for the vehicle when it is under abnormal operation conditions, including the inability to obtain the real-time adhesion coefficient and the abnormality of the vehicle's current sampling circuit.

[0126] In some alternative implementations, the power isolation device further includes: The parameter constraint module is used to determine the fourth overcurrent protection parameter corresponding to the vehicle within the preset protection parameter range when the first overcurrent protection parameter is detected to exceed the preset protection parameter range.

[0127] In some optional implementations, the acquisition module 401 is further configured to acquire a real-time road surface image of the road surface where the vehicle is located; determine the real-time road surface state of the vehicle based on the real-time road surface image; input the real-time road surface state and the vehicle's wheel speed signal into a preset adhesion coefficient estimation model; the wheel speed signal is used to characterize the real-time rotational speed information corresponding to each wheel of the vehicle; and acquire the output result of the adhesion coefficient estimation model to obtain the real-time adhesion coefficient.

[0128] In some alternative implementations, the power isolation device further includes: The filtering module is used to filter the first overcurrent protection parameter; the filtered first overcurrent protection parameter is used to provide overcurrent protection for the vehicle.

[0129] In some optional implementations, the parameter determination module 403 is also used to multiply the real-time adjustment coefficient with the reference overcurrent protection parameter to obtain the first overcurrent protection parameter corresponding to the vehicle.

[0130] The power isolation device provided in this embodiment of the invention can execute the overcurrent protection parameter determination method provided in any embodiment of the invention, and has the corresponding functional modules and beneficial effects of the method. Further functional descriptions of the various modules and units described above are the same as in the corresponding embodiments described above, and will not be repeated here.

[0131] Figure 5 This is a schematic diagram of the structure of a microcontroller in a power isolation device provided in an embodiment of the present invention.

[0132] The following is a detailed reference. Figure 5 The diagram illustrates a suitable structural schematic for implementing a microcontroller in an embodiment of the present invention. The microcontroller may include a processor (e.g., a central processing unit, a graphics processing unit, etc.) 501, which can perform various appropriate actions and processes based on a program stored in read-only memory (ROM) 502 or a program loaded from memory 508 into random access memory (RAM) 503. The RAM 503 also stores various programs and data required for the operation of the microcontroller. The processor 501, ROM 502, and RAM 503 are interconnected via a bus 504. An input / output (I / O) interface 505 is also connected to the bus 504.

[0133] Typically, the following devices can be connected to I / O interface 505: input devices 506 including, for example, touchscreens, touchpads, keyboards, mice, cameras, microphones, accelerometers, gyroscopes, etc.; output devices 507 including, for example, liquid crystal displays (LCDs), speakers, vibrators, etc.; memory devices 508 including, for example, magnetic tapes, hard disks, etc.; and communication devices 509. Communication device 509 allows the microcontroller to communicate wirelessly or wiredly with other devices to exchange data. Although Figure 5 A microcontroller with various devices is shown, but it should be understood that it is not required to implement or have all of the devices shown, and it may be implemented or have more or fewer devices instead.

[0134] In particular, according to embodiments of the present invention, the processes described above with reference to the flowcharts can be implemented as computer software programs. For example, embodiments of the present invention include a computer program product comprising a computer program carried on a non-transitory computer-readable medium, the computer program containing program code for performing the methods shown in the flowcharts. In such embodiments, the computer program can be downloaded and installed from a network via a communication device 509, or installed from a memory 508, or installed from a ROM 502. When the computer program is executed by the processor 501, it performs the functions defined in the overcurrent protection parameter determination method of the embodiments of the present invention.

[0135] Figure 5The microcontroller shown is merely an example and should not be construed as limiting the functionality and scope of use of the embodiments of the present invention.

[0136] This invention also provides a computer-readable storage medium. The methods described above according to embodiments of the invention can be implemented in hardware or firmware, or implemented as computer code that can be recorded on a storage medium, or implemented as computer code downloaded via a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and then stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; further, the storage medium can also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code. When the software or computer code is accessed and executed by the computer, processor, or hardware, the overcurrent protection parameter determination method shown in the above embodiments is implemented.

[0137] A portion of this invention can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to the invention through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0138] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for determining overcurrent protection parameters, characterized in that, The method includes: Obtain the real-time adhesion coefficient corresponding to the vehicle; the real-time adhesion coefficient is determined based on the real-time road conditions where the vehicle is located; Based on a preset mapping table between adhesion coefficients and adjustment coefficients, the real-time adjustment coefficient corresponding to the real-time road surface adhesion coefficient is determined; the real-time adjustment coefficient is used to characterize the degree of adjustment of the reference overcurrent protection parameters based on the real-time road surface adhesion coefficient. The reference overcurrent protection parameter is adjusted based on the real-time adjustment coefficient to obtain the first overcurrent protection parameter corresponding to the vehicle; the first overcurrent protection parameter is used to provide overcurrent protection for the vehicle when it is in a normal control state.

2. The method according to claim 1, characterized in that, The method further includes: In response to the escape control command, a preset maximum overcurrent protection parameter value is obtained; the escape control command is used to characterize the control command triggered when the vehicle is in a restricted operating state. Based on the maximum overcurrent protection parameter value and the reference overcurrent protection parameter, a second overcurrent protection parameter is determined; the second overcurrent protection parameter is used to provide overcurrent protection for the vehicle when the vehicle is in a restricted operating state.

3. The method according to claim 2, characterized in that, After determining the second overcurrent protection parameter, the method further includes: In response to the end of the traction command, or when the real-time road surface adhesion coefficient is within the preset adhesion coefficient range, the reference overcurrent protection parameter is adjusted based on the real-time adjustment coefficient to obtain the first overcurrent protection parameter corresponding to the vehicle.

4. The method according to claim 1, characterized in that, The method further includes: When the vehicle meets abnormal operating conditions, the reference overcurrent protection parameter is adjusted based on a preset adjustment weight to obtain the third overcurrent protection parameter corresponding to the vehicle. The third overcurrent protection parameter is used to provide overcurrent protection for the vehicle when it is under abnormal operating conditions, including the inability to obtain the real-time adhesion coefficient and an abnormality in the vehicle's current sampling circuit.

5. The method according to claim 1, characterized in that, After obtaining the first overcurrent protection parameters corresponding to the vehicle, the method further includes: When the first overcurrent protection parameter is detected to exceed the preset protection parameter range, the fourth overcurrent protection parameter corresponding to the vehicle is determined within the preset protection parameter range.

6. The method according to claim 1, characterized in that, The process of obtaining the real-time adhesion coefficient corresponding to the vehicle includes: Acquire real-time road surface images of the road surface where the vehicle is located; Based on the real-time road surface image, the real-time road surface condition of the vehicle is determined; The real-time road surface condition and the vehicle's wheel speed signal are input into a preset adhesion coefficient estimation model; the wheel speed signal is used to characterize the real-time rotational speed information corresponding to each wheel of the vehicle. The real-time adhesion coefficient is obtained by acquiring the output of the adhesion coefficient estimation model.

7. The method according to claim 1, characterized in that, After obtaining the first overcurrent protection parameters corresponding to the vehicle, the method further includes: The first overcurrent protection parameter is filtered. The vehicle is protected from overcurrent using the filtered first overcurrent protection parameters.

8. The method according to claim 1, characterized in that, The adjustment of the reference overcurrent protection parameters based on the real-time adjustment coefficient to obtain the first overcurrent protection parameters corresponding to the vehicle includes: The real-time adjustment coefficient is multiplied by the reference overcurrent protection parameter to obtain the first overcurrent protection parameter corresponding to the vehicle.

9. A power isolation device, characterized in that, The device includes: The acquisition module is used to acquire the real-time adhesion coefficient corresponding to the vehicle; the real-time adhesion coefficient is determined based on the real-time road conditions where the vehicle is located. The adjustment module is used to determine the real-time adjustment coefficient corresponding to the real-time road surface adhesion coefficient according to a preset mapping table between the adhesion coefficient and the adjustment coefficient; the real-time adjustment coefficient represents the degree of adjustment of the reference overcurrent protection parameter based on the real-time road surface adhesion coefficient. The parameter determination module is used to adjust the reference overcurrent protection parameter based on the real-time adjustment coefficient to obtain the first overcurrent protection parameter corresponding to the vehicle; the first overcurrent protection parameter is used to provide overcurrent protection for the vehicle when the vehicle is in a normal control state.

10. A vehicle, characterized in that, Includes a power isolation device, wherein the microcontroller in the power isolation device includes: A memory and a processor are communicatively connected, the memory stores computer instructions, and the processor executes the computer instructions to perform the overcurrent protection parameter determination method according to any one of claims 1 to 8.

11. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing a computer to perform the overcurrent protection parameter determination method according to any one of claims 1 to 8.

12. A computer program product, characterized in that, Includes computer instructions for causing a computer to perform the overcurrent protection parameter determination method according to any one of claims 1 to 8.

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