A high-pressure unloading protection method and device based on collision pre-judgment logic

Abstract

The present application relates to the technical field of high-voltage safety control of electric vehicles, and particularly relates to a high-voltage unloading protection method and device based on collision pre-judgment logic, which is used to solve the problem that in the prior art, collision high-voltage safety protection is mainly passive safety protection, and the main measure is that after collision occurs, different high-voltage disconnection times cannot be realized according to different collision working conditions. The present application mainly analyzes parameter information of a key controller of a whole vehicle before collision occurs, divides the collision level into four levels, distinguishes the emergency situation of the collision, and effectively formulates the control logic after the pre-collision confirmation, so that the high-voltage unloading parameters under the pre-collision can be finely processed. The present application mainly relates to collision pre-judgment and high-voltage unloading protection measures, the possibility of collision is identified, different pre-collision levels are divided, the unloading speed is pre-intervened and adjusted, the probability of high-voltage load disconnection is effectively avoided, and the high-voltage safety is enhanced.

Description

Technical Field

[0001] This invention relates to the field of high-voltage safety control technology for electric vehicles, and in particular to a high-voltage unloading protection method and device based on collision pre-judgment logic. Background Technology

[0002] With the increasing height of high-voltage platforms in electric vehicles and the growing power of motors and batteries, high-voltage safety during high-speed collisions has become even more critical. Current common collision high-voltage safety protection is primarily passive, mainly involving disconnecting the high-voltage relay within a certain time after a collision to prevent exposed high-voltage wiring and short circuits. The key to passive collision high-voltage safety protection lies in the time required to disconnect the high voltage after a collision; the shorter the time, the higher the safety and the lower the probability of fire and electrical leakage.

[0003] The latest technology involves adding a power-off switch to the relay drive power supply or high-voltage wiring harness. This switch is directly driven by the airbag controller current. After a collision, the airbag controller generates current, which acts on the power-off switch, allowing it to disconnect the high-voltage relay or high-voltage wire within 30ms or less. Another traditional technology involves the airbag controller sending a PWM (Pulse Width Modulation) signal or a CAN (Controller Area Network) signal to the vehicle controller or battery management system. The battery management system then determines the appropriate action and disconnects the switch. This approach takes slightly longer to disconnect the relay, but it still keeps the time within 100ms. However, in high-voltage passive safety protection measures during collisions, the relay terminals may carry a large current load when disconnected. Under such a heavy load, disconnecting the relay or high-voltage wire can lead to relay sticking or sparking during power disconnection, posing a significant safety hazard.

[0004] In summary, existing collision high-voltage safety protection technologies are mainly passive safety protections. Their main measure is that after a collision occurs, they cannot achieve different disconnection times for the high voltage based on different collision conditions. Summary of the Invention

[0005] To address the aforementioned problems, this invention provides a high-voltage unloading protection method and device based on collision pre-judgment logic. This addresses the issue that existing collision high-voltage safety protection is primarily passive, mainly because it cannot adjust the high-voltage disconnection time according to different collision conditions after a collision occurs. This invention configures different high-voltage disconnection times based on the collision conditions before the collision occurs, reducing the high-voltage load in the shortest possible time under different configurations, thereby enhancing the overall safety of high-voltage power disconnection during collisions.

[0006] A high-voltage unloading protection method based on collision pre-judgment logic, the method comprising:

[0007] Obtain parameters from multiple vehicle controllers when a collision is about to be triggered, and determine the pre-collision level of the vehicle based on the parameters.

[0008] Adjust the unloading parameters of each high-voltage electrical component of the vehicle according to the pre-collision level.

[0009] Furthermore, the relevant parameters interacted by the various controllers of the vehicle include vehicle speed, acceleration, gear position, accelerator pedal opening, brake pedal travel, ABS activation status, AEB activation status, distance between the vehicle and the obstacle in front, and relative speed between the obstacle in front and the vehicle.

[0010] Furthermore, the pre-collision levels include level zero pre-collision, level one pre-collision, level two pre-collision, and level three pre-collision;

[0011] The criteria for judging a level 0 pre-collision collision are:

[0012] The following conditions must be met: no pre-collision of level zero is triggered, the accelerator pedal opening is greater than parameter U4, the brake pedal opening is less than parameter B4 or the deceleration is less than parameter A4;

[0013] The criteria for Level 1 pre-collision detection are:

[0014] The following conditions must be met simultaneously: the current gear is D, the accelerator pedal opening is less than parameter U1, the brake pedal opening is greater than parameter B1, the deceleration is greater than parameter A1, and the current vehicle speed is greater than parameter V1.

[0015] Or ABS activation;

[0016] The criteria for determining a Level 2 pre-collision event are:

[0017] The following conditions must be met simultaneously: the current gear is in D, ABS is activated, the accelerator pedal opening is less than parameter U2, the brake pedal opening is greater than parameter B2, the brake pedal travel change rate is greater than parameter db1 during the current braking cycle, the deceleration is greater than parameter A2, and the current vehicle speed is greater than parameter V2.

[0018] The criteria for Level 3 pre-collision judgment are:

[0019] The following conditions must be met simultaneously: the current gear is in D, ABS is activated, the accelerator pedal opening is less than parameter U3, the brake pedal opening is greater than parameter B3, the brake pedal travel change rate is greater than parameter db2 during the current braking cycle, the deceleration is greater than parameter A3, and the current vehicle speed is greater than parameter V3.

[0020] Or the following conditions must be met simultaneously: the current gear is in D, AEB is activated, and the pre-collision time is less than the collision time t1;

[0021] The collision time t1 is calculated based on the distance and relative speed between the obstacle in front and the vehicle.

[0022] Furthermore, the following parameters of the pre-collision rating are calibrated through real vehicle testing: U1, U2, U3, U4, A1, A2, A3, A4, B1, B2, B3, B4, V1, V2, V3, db1, and db2.

[0023] Furthermore, the unloading parameters of various high-voltage electrical components in the vehicle are adjusted according to the pre-collision level, specifically including:

[0024] Set initial unloading parameters for each high-voltage electrical component;

[0025] Upon receiving a level zero pre-collision signal, the control of each high-voltage electrical component is implemented according to the initial unloading parameters;

[0026] Upon receiving a Level 1 pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to half of the initial unloading parameters, including both control command parameters and execution parameters. The unloading time is halved, and high-voltage energy management is executed according to the original requirements.

[0027] Upon receiving a Level 2 pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to execute according to its fastest unloading capacity, while high-voltage energy management executes according to the original requirements.

[0028] Upon receiving a Level 3 pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to perform according to its fastest unloading capacity. The high-voltage energy management module requests the shutdown of the heat pump control system, compressor control system, heater PTC control system, motor control system, DC / DC control system, and collision pre-judgment module. The motor executes the Active Stability Control System (ASC) at its maximum capacity, consuming excess energy through body heating. At the same time, the control system controls the coolant flow rate to the maximum and the fan speed to the maximum.

[0029] A high-voltage unloading protection device based on collision pre-judgment logic includes: a collision pre-judgment module and a high-voltage unloading parameter processing module;

[0030] The collision pre-judgment module is used to acquire parameters from multiple vehicle controllers when a collision is about to be triggered, and to determine the pre-collision level of the vehicle based on the parameters.

[0031] The high-voltage unloading parameter processing module is used to adjust the unloading parameters of various high-voltage electrical components of the vehicle according to the pre-collision level.

[0032] Furthermore, the relevant parameters interacted by the various controllers of the vehicle include vehicle speed, acceleration, gear, accelerator pedal opening, brake pedal travel, ABS activation status, AEB activation status, distance between the vehicle and the obstacle in front, and relative speed between the vehicle and the obstacle in front.

[0033] Furthermore, the pre-collision levels include level zero pre-collision, level one pre-collision, level two pre-collision, and level three pre-collision;

[0034] The criteria for judging a level 0 pre-collision collision are:

[0035] The following conditions must be met: no pre-collision of level zero is triggered, the accelerator pedal opening is greater than parameter U4, the brake pedal opening is less than parameter B4 or the deceleration is less than parameter A4;

[0036] The criteria for Level 1 pre-collision detection are:

[0037] The following conditions must be met simultaneously: the current gear is D, the accelerator pedal opening is less than parameter U1, the brake pedal opening is greater than parameter B1, the deceleration is greater than parameter A1, and the current vehicle speed is greater than parameter V1.

[0038] Or ABS activation;

[0039] The criteria for determining a Level 2 pre-collision event are:

[0040] The following conditions must be met simultaneously: the current gear is in D, ABS is activated, the accelerator pedal opening is less than parameter U2, the brake pedal opening is greater than parameter B2, the brake pedal travel change rate is greater than parameter db1 during the current braking cycle, the deceleration is greater than parameter A2, and the current vehicle speed is greater than parameter V2.

[0041] The criteria for Level 3 pre-collision judgment are:

[0042] The following conditions must be met simultaneously: the current gear is in D, ABS is activated, the accelerator pedal opening is less than parameter U3, the brake pedal opening is greater than parameter B3, the brake pedal travel change rate is greater than parameter db2 during the current braking cycle, the deceleration is greater than parameter A3, and the current vehicle speed is greater than parameter V3.

[0043] Or the following conditions must be met simultaneously: the current gear is in D, AEB is activated, and the pre-collision time is less than the collision time t1;

[0044] The collision time t1 is calculated based on the distance and relative speed between the obstacle in front and the vehicle.

[0045] Furthermore, the following parameters of the pre-collision rating are calibrated through real vehicle testing: U1, U2, U3, U4, A1, A2, A3, A4, B1, B2, B3, B4, V1, V2, V3, db1, and db2.

[0046] Furthermore, initial unloading parameters are set for each high-voltage electrical component;

[0047] When the high-voltage unloading parameter processing module receives the level zero pre-collision signal, the control of each high-voltage electrical component is implemented according to the initial unloading parameters.

[0048] When the high-voltage unloading parameter processing module receives the first-level pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to half of the initial unloading parameters, including the control command parameters and the execution parameters. The unloading time is halved, and high-voltage energy management is executed according to the original requirements.

[0049] When the high-voltage unloading parameter processing module receives the secondary pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to execute according to its fastest unloading capacity, and high-voltage energy management is executed according to the original requirements.

[0050] When the high-voltage unloading parameter processing module receives a level 3 pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to perform according to its fastest unloading capacity. The high-voltage energy management module requests the shutdown of the heat pump control system, compressor control system, PTC control system, motor control system, DC / DC control system, and collision pre-judgment module. The motor performs ASC according to the system's maximum capacity, consuming excess energy through its own heat generation. At the same time, the control system controls the coolant flow rate to the maximum and the fan speed to the maximum.

[0051] This invention mainly involves collision prediction and high-voltage unloading protection measures. By identifying the possibility of collision, different pre-collision levels are divided, and the unloading speed is intervened and adjusted in advance to effectively avoid the probability of high-voltage load cut-off and enhance high-voltage safety.

[0052] This invention mainly categorizes the collision level into four levels by analyzing the parameter information of the vehicle's key controllers before a collision occurs, distinguishing the emergency situations of the impending collision, which facilitates the effective formulation of control logic after pre-collision confirmation, and allows for refined processing of high-pressure unloading parameters under pre-collision conditions.

[0053] This invention classifies the pre-collision state and sets the unloading time according to the level. The unloading time is reduced under each level. While reducing the overall unloading time, it also takes into account the unloading capacity of the electrical components themselves to avoid failures caused by high voltage spillage or excessively rapid unloading.

[0054] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures pointed out in the description and the drawings. Attached Figure Description

[0055] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the 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 based on these drawings without creative effort.

[0056] Figure 1 A schematic diagram of collision pre-judgment according to an embodiment of the present invention is shown.

[0057] Figure 2 A schematic diagram of high-pressure parameter unloading processing according to an embodiment of the present invention is shown. Detailed Implementation

[0058] 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.

[0059] In existing technologies, high-voltage safety protection during collisions is mainly passive, and its primary measure is the inability to adjust the high-voltage disconnection time according to different collision conditions after a collision occurs. Therefore, this invention proposes a high-voltage unloading protection method and device based on collision pre-judgment logic, including a high-voltage unloading protection method and a high-voltage unloading protection device based on collision pre-judgment logic.

[0060] Before a collision occurs, this invention configures different high-voltage disconnection times according to different collision conditions, reducing the high-voltage load in the shortest time under different configurations, thereby enhancing the overall safety of high-voltage power disconnection during collisions.

[0061] In a first aspect, the present invention provides a high-voltage unloading protection method based on collision pre-judgment logic, the method comprising:

[0062] The pre-collision level of the vehicle is determined based on the relevant parameters exchanged between the various controllers of the vehicle, and the unloading parameters of the various high-voltage electrical components of the vehicle are adjusted according to the pre-collision level.

[0063] In practice, parameters from multiple vehicle controllers are obtained when a collision is about to be triggered. The probability of a collision is identified through these parameters, different pre-collision levels are classified, and the unloading speed is adjusted in advance to effectively avoid the probability of high-voltage load cut-off and enhance high-voltage safety.

[0064] The unloading time for each component is adjustable. For example, if the high-pressure load unloading time of the high-pressure compressor used in an air conditioner is set to 1 second at the factory, the compressor's optimal unloading performance is 0.2 seconds. Then, depending on the pre-collision level, the unloading time becomes 0.5 seconds for a level one pre-collision and 0.2 seconds for a level two pre-collision. By classifying the pre-collision state and setting the unloading time according to the level, the unloading time decreases at each level. This reduces the overall unloading time while considering the unloading capacity of the electrical components themselves, preventing malfunctions caused by high-pressure load shedding or excessively rapid unloading.

[0065] In this embodiment, the relevant parameters interacted by the various controllers of the vehicle include vehicle speed, acceleration, gear, accelerator pedal opening, brake pedal travel, ABS activation status, AEB activation status, distance between the vehicle and the obstacle in front, and relative speed between the vehicle and the obstacle in front.

[0066] In this embodiment, the pre-collision levels include level zero pre-collision, level one pre-collision, level two pre-collision, and level three pre-collision;

[0067] A level 0 pre-collision rating is defined as follows: either condition a1 is met (no pre-collision of level 0 or higher is triggered), or condition a2 is met (when currently in a pre-collision situation of level 0 or higher, any one of the following conditions is satisfied: accelerator pedal opening greater than parameter U4, brake pedal opening less than parameter B4, or deceleration less than parameter A4).

[0068] The first-level pre-collision judgment condition is to meet condition b1: the current gear is in D gear, and the accelerator pedal opening is less than parameter U1, and the brake pedal opening is greater than parameter B1, and the deceleration is greater than parameter A1, and the current vehicle speed is greater than parameter V1, or to meet condition b2: ABS is activated.

[0069] The conditions for judging a level 2 pre-collision are as follows: the current gear is in D gear, ABS is activated, the accelerator pedal opening is less than parameter U2, the brake pedal opening is greater than parameter B2, the brake pedal travel change rate is greater than parameter db1 during the current braking cycle, the deceleration is greater than parameter A2, and the current vehicle speed is greater than parameter V2.

[0070] The conditions for a Level 3 pre-collision test are as follows: Condition d1 is met: the current gear is in D, ABS is activated, the accelerator pedal opening is less than parameter U3, the brake pedal opening is greater than parameter B3, the brake pedal travel rate of change is greater than parameter db2 during the current braking cycle, the deceleration is greater than parameter A3, and the current vehicle speed is greater than parameter V3; or Condition d2 is met: the current gear is in D, AEB is activated, and the pre-collision time is less than the collision time t1.

[0071] The collision time t1 is calculated based on the distance and relative speed between the obstacle in front and the vehicle.

[0072] In practice, before a collision occurs, the parameter information of the vehicle's key controllers is analyzed to classify the collision level into four levels, distinguishing the emergency situations that are about to collide. This facilitates the effective formulation of control logic after pre-collision confirmation, and allows for the fine-tuning of high-pressure unloading parameters under pre-collision conditions.

[0073] The collision time t1 is equal to the distance between the obstacle in front and the vehicle divided by the relative speed.

[0074] In this embodiment, the following parameters of the pre-collision level are calibrated through real vehicle tests: U1, U2, U3, U4, A1, A2, A3, A4, B1, B2, B3, B4, V1, V2, V3, db1, and db2.

[0075] In this embodiment, adjusting the unloading parameters of various high-voltage electrical components of the vehicle according to the pre-collision level specifically includes:

[0076] Set initial unloading parameters for each high-voltage electrical component;

[0077] Upon receiving a level zero pre-collision signal, the control of each high-voltage electrical component is implemented according to the initial unloading parameters;

[0078] Upon receiving a Level 1 pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to half of the initial unloading parameters, including both control command parameters and execution parameters. The unloading time is halved, and high-voltage energy management is executed according to the original requirements.

[0079] Upon receiving a Level 2 pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to execute according to its fastest unloading capacity, while high-voltage energy management executes according to the original requirements.

[0080] Upon receiving a Level 3 pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to perform according to its fastest unloading capacity. The high-voltage energy management module requests the shutdown of all high-voltage electrical components except for the DC / DC (high-voltage DC to low-voltage DC converter controller). The motor executes ASC (Active Stability Control) according to the system's maximum capacity, consuming excess energy through its own heat generation. At the same time, the control system controls the coolant flow rate and fan speed to the maximum.

[0081] In practice, the high-voltage energy management module is a control module that enables and controls the power of high-voltage electrical components. In the event of an imminent emergency collision, it directly cuts off other electrical equipment except those used for low-voltage loads.

[0082] Each high-voltage electrical component adjusts its unloading parameters according to its fastest unloading capacity. This means that under the condition of an impending collision, each high-voltage electrical component can achieve the fastest unloading capacity. The fastest unloading capacity is specific and unique under the condition of an impending collision.

[0083] While reducing unloading time, the unloading capacity of the electrical components themselves should be taken into account to avoid failures caused by high-voltage load shedding or excessively rapid unloading.

[0084] After a collision pre-judgment, the car brakes and decelerates. The engine rotor cuts the magnetic field lines, generating a reverse current that causes a back electromotive force in the motor. This current needs to be dissipated internally by the motor through internal resistance heating. In this invention, the air conditioning thermal management system receives the pre-collision level and increases the coolant flow and fan speed accordingly to achieve faster and better cooling, thereby increasing the cooling capacity of the cooling circuit and preventing the motor from overheating.

[0085] Secondly, the present invention provides a high-voltage unloading protection device based on collision pre-judgment logic, comprising: a collision pre-judgment module and a high-voltage unloading parameter processing module;

[0086] The collision pre-judgment module is used to acquire parameters from multiple vehicle controllers when a collision is about to be triggered, and to determine the pre-collision level of the vehicle based on the parameters.

[0087] The high-voltage unloading parameter processing module is used to adjust the unloading parameters of various high-voltage electrical components of the vehicle according to the pre-collision level.

[0088] In this embodiment, the relevant parameters interacted by the various controllers of the vehicle include vehicle speed, acceleration, gear, accelerator pedal opening, brake pedal travel, ABS activation status, AEB activation status, distance between the vehicle and the obstacle in front, and relative speed between the vehicle and the obstacle in front.

[0089] In this embodiment, the pre-collision levels of the collision pre-judgment module include level zero pre-collision, level one pre-collision, level two pre-collision, and level three pre-collision.

[0090] A level 0 pre-collision rating is defined as follows: either condition a1 is met (no pre-collision of level 0 or higher is triggered), or condition a2 is met (when currently in a pre-collision situation of level 0 or higher, any one of the following conditions is satisfied: accelerator pedal opening greater than parameter U4, brake pedal opening less than parameter B4, or deceleration less than parameter A4).

[0091] The first-level pre-collision judgment condition is to meet condition b1: the current gear is in D gear, and the accelerator pedal opening is less than parameter U1, and the brake pedal opening is greater than parameter B1, and the deceleration is greater than parameter A1, and the current vehicle speed is greater than parameter V1, or to meet condition b2: ABS is activated.

[0092] The conditions for judging a level 2 pre-collision are as follows: the current gear is in D gear, ABS is activated, the accelerator pedal opening is less than parameter U2, the brake pedal opening is greater than parameter B2, the brake pedal travel change rate is greater than parameter db1 during the current braking cycle, the deceleration is greater than parameter A2, and the current vehicle speed is greater than parameter V2.

[0093] The conditions for a Level 3 pre-collision test are as follows: Condition d1 is met: the current gear is in D, ABS is activated, the accelerator pedal opening is less than parameter U3, the brake pedal opening is greater than parameter B3, the brake pedal travel rate of change is greater than parameter db2 during the current braking cycle, the deceleration is greater than parameter A3, and the current vehicle speed is greater than parameter V3; or Condition d2 is met: the current gear is in D, AEB is activated, and the pre-collision time is less than the collision time t1.

[0094] The collision time t1 is calculated based on the distance and relative speed between the obstacle in front and the vehicle.

[0095] In this embodiment, the following parameters of the pre-collision level are calibrated through real vehicle tests: U1, U2, U3, U4, A1, A2, A3, A4, B1, B2, B3, B4, V1, V2, V3, db1, and db2.

[0096] In practice, U1, U2, U3, and U4 should be as small as possible, and their values ​​are usually between 0% and 2%.

[0097] The values ​​of B1, B2, B3 and B4 are usually between 2% and 5%, depending on the free travel of the vehicle's brake pedal and accelerator pedal, and should be slightly larger than the free travel.

[0098] A1, A2, A3, and A4 need to be calibrated on actual vehicles based on the driving experience of deceleration. For example, A1 is 0.3, A2 is 0.4, A3 is 0.5, and A4 is 0.25.

[0099] The values ​​of V1, V2, and V3 are in the range of 0 to 15;

[0100] For example, the rate of change db1 is 300% per second, and db2 is 500% per second;

[0101] In reality, apart from the pedal opening reference travel, all the above parameters need to be calibrated through actual vehicle driving, specifically under extreme driving conditions. Therefore, the best way to calibrate these parameters is through driving simulation analysis combined with real vehicle performance. The parameters will vary slightly for each vehicle model.

[0102] In this embodiment, when the high-voltage unloading parameter processing module receives the zero-level pre-collision signal, the control of each high-voltage electrical component is implemented according to the initial unloading parameters.

[0103] When the high-voltage unloading parameter processing module receives the first-level pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to half of the initial unloading parameters, including the control command parameters and the execution parameters. The unloading time is halved, and high-voltage energy management is executed according to the original requirements.

[0104] When the high-voltage unloading parameter processing module receives the secondary pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to execute according to its fastest unloading capacity, and high-voltage energy management is executed according to the original requirements.

[0105] When the high-voltage unloading parameter processing module receives the level 3 pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to perform according to its fastest unloading capacity. The high-voltage energy management module requests to shut down high-voltage electrical components other than DC / DC. The motor performs ASC according to the system's maximum capacity, dissipating excess energy through its own heat generation. At the same time, the control system controls the coolant flow rate and fan speed to the maximum.

[0106] To enable those skilled in the art to better understand the present invention, the principles of the present invention are explained below in conjunction with the accompanying drawings:

[0107] This invention is divided into two main modules: a collision pre-judgment module and a high-pressure unloading parameter processing module.

[0108] The collision pre-judgment module mainly integrates relevant parameters from the interaction of various controllers in the vehicle to determine the conditions under which a collision is about to occur. To accommodate various scenarios involving complex driving by the driver, this invention sets four levels of pre-collision in the collision pre-judgment module: Level 0 pre-collision, Level 1 pre-collision, Level 2 pre-collision, and Level 3 pre-collision. The higher the pre-collision level, the higher the probability of a collision, and the more stringent the corresponding high-pressure unloading parameter processing logic.

[0109] Collision prediction diagram as shown Figure 1As shown, the collision prediction module obtains vehicle speed and acceleration signals from the Electronic Stability Controller (ESC), brake and brake pedal travel signals from the Integrated Power Brake (IPB) system, current gear signal from the gear management system, accelerator pedal opening signal from the accelerator resolution system, distance and relative speed of forward-looking vehicles / obstacles from the Advanced Driver Assistance System (ADAS), AEB activation status from the Autonomous Emergency Braking (AEB) system, and ABS activation status from the Anti-lock Braking System (ABS).

[0110] The specific logic of the collision pre-judgment module is as follows:

[0111] The collision prediction module receives input signals including vehicle speed, acceleration, gear position, accelerator pedal opening, brake pedal travel, ABS activation status, AEB activation status, distance to forward-looking obstacles / vehicles, and relative speed.

[0112] The collision pre-judgment module outputs a pre-collision level signal.

[0113] The collision prediction system calculates the pre-collision time t1 based on the distance and relative speed of the forward-looking vehicle / obstacle input from the ADAS system.

[0114] Zero-level pre-collision: No pre-collision of level zero was triggered.

[0115] If the current pre-collision level is greater than zero, then the pre-collision level is equal to zero pre-collision level if any of the following conditions are met:

[0116] The accelerator pedal opening is greater than U4, the brake pedal opening is less than B4, and the deceleration is less than A4.

[0117] Level 1 Pre-Collision:

[0118] The current gear is D, the accelerator pedal opening is less than U1, the brake pedal opening is greater than B1, the deceleration is greater than A1, and the current vehicle speed is greater than V1.

[0119] Or ABS activation;

[0120] Level 2 pre-collision:

[0121] The current gear is D, ABS is activated, the accelerator pedal opening is less than U2, the brake pedal opening is greater than B2, the brake pedal travel change rate is greater than db1 during the current braking cycle, the deceleration is greater than A2, and the current vehicle speed is greater than V2.

[0122] Level 3 pre-collision:

[0123] The current gear is D, ABS is activated, the accelerator pedal opening is less than U3, the brake pedal opening is greater than B3, the brake pedal travel change rate is greater than db2 during the current braking cycle, the deceleration is greater than A3, and the current vehicle speed is greater than V3.

[0124] Or, if the current gear is in D, AEB is activated and the pre-collision time is less than t1;

[0125] All of the above parameters can be calibrated through real vehicle testing.

[0126] The high-voltage parameter unloading processing module primarily handles the unloading parameters of various high-voltage electrical components, specifically the shutdown time of these components. In the initial program design, to ensure drivability and smooth control, unloading times were calibrated to a certain duration, such as MAP filtering (or graph filtering) for motor torque requests, PTC unloading step processing, and smooth compressor speed reduction. This module adjusts the control parameters of the corresponding high-voltage electrical components according to the pre-collision level to achieve rapid unloading. The adjustments to the parameters of each component must be within its own unloading capacity.

[0127] High-voltage parameter unloading processing, such as Figure 2 As shown, the high-voltage parameter unloading processing module adjusts the parameters of the following high-voltage electrical components: heat pump control system, compressor control system, PTC (Positive Temperature Coefficient) control system, motor control system, DC / DC control system, and collision pre-judgment module. The specific logic of the high-voltage parameter unloading processing is as follows:

[0128] Each high-voltage electrical component needs to undergo pre-collision level testing.

[0129] Upon receiving the zero-level pre-collision signal, the high-voltage parameter unloading processing module controls each high-voltage electrical component according to the initial unloading parameters.

[0130] Upon receiving a Level 1 pre-collision signal, the high-voltage parameter unloading processing module adjusts the unloading parameters of each high-voltage electrical component to half of the initial unloading parameters. This includes both the control command end and the execution end, halving the unloading time, and allowing high-voltage energy management to proceed as originally required.

[0131] Upon receiving the secondary pre-collision signal, the high-voltage parameter unloading processing module adjusts the unloading parameters of each high-voltage electrical component to execute according to its fastest unloading capacity, while high-voltage energy management executes according to the original requirements.

[0132] The high-voltage parameter unloading processing module receives a level 3 pre-collision signal. Each high-voltage electrical component adjusts its unloading parameters to perform according to its fastest unloading capacity. The high-voltage energy management module requests to shut down high-voltage electrical components other than DC / DC. The motor performs ASC according to the system's maximum capacity, dissipating excess energy through its own heat generation. At the same time, the control system controls the coolant flow rate and fan speed to the maximum.

[0133] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A high-voltage unloading protection method based on collision pre-judgment logic, characterized in that, The method includes: Obtain parameters from multiple vehicle controllers when a collision is about to be triggered, and determine the pre-collision level of the vehicle based on the parameters. Adjust the unloading parameters of each high-voltage electrical component of the vehicle according to the pre-collision level; The relevant parameters interacted by the various controllers of the vehicle include vehicle speed, acceleration, gear, accelerator pedal opening, brake pedal travel, ABS activation status, AEB activation status, distance between the vehicle and the forward-looking obstacle, and relative speed between the vehicle and the forward-looking obstacle. The pre-collision levels include Level 0 pre-collision, Level 1 pre-collision, Level 2 pre-collision, and Level 3 pre-collision. The criteria for judging a level 0 pre-collision collision are: No pre-collision level greater than zero was triggered. If the current pre-collision level is greater than zero, then the pre-collision level is equal to zero pre-collision level if any of the following conditions are met: The accelerator pedal opening is greater than parameter U4, the brake pedal opening is less than parameter B4, and the deceleration is less than parameter A4. The criteria for Level 1 pre-collision detection are: The following conditions must be met simultaneously: the current gear is D, the accelerator pedal opening is less than parameter U1, the brake pedal opening is greater than parameter B1, the deceleration is greater than parameter A1, and the current vehicle speed is greater than parameter V1. Or ABS activation; The criteria for determining a Level 2 pre-collision event are: The following conditions must be met simultaneously: the current gear is in D, ABS is activated, the accelerator pedal opening is less than parameter U2, the brake pedal opening is greater than parameter B2, the brake pedal travel change rate is greater than parameter db1 during the current braking cycle, the deceleration is greater than parameter A2, and the current vehicle speed is greater than parameter V2. The criteria for Level 3 pre-collision judgment are: The following conditions must be met simultaneously: the current gear is in D, ABS is activated, the accelerator pedal opening is less than parameter U3, the brake pedal opening is greater than parameter B3, the brake pedal travel change rate is greater than parameter db2 during the current braking cycle, the deceleration is greater than parameter A3, and the current vehicle speed is greater than parameter V3. Or the following conditions must be met simultaneously: the current gear is in D, AEB is activated, and the pre-collision time is less than the collision time t1; The collision time t1 is calculated based on the distance and relative speed between the forward-looking obstacle and the vehicle; The following parameters of the pre-collision ratings were calibrated through real vehicle testing: U1, U2, U3, U4, A1, A2, A3, A4, B1, B2, B3, B4, V1, V2, V3, db1, and db2; Adjusting the unloading parameters of various high-voltage electrical components in the vehicle according to the pre-collision level, specifically including: Set initial unloading parameters for each high-voltage electrical component; Upon receiving a level zero pre-collision signal, the control of each high-voltage electrical component is implemented according to the initial unloading parameters; Upon receiving a Level 1 pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to half of the initial unloading parameters, including both control command parameters and execution parameters. The unloading time is halved, and high-voltage energy management is executed according to the original requirements. Upon receiving a Level 2 pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to execute according to its fastest unloading capacity, while high-voltage energy management executes according to the original requirements. Upon receiving a Level 3 pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to perform according to its fastest unloading capacity. The high-voltage energy management module requests the shutdown of the heat pump control system, compressor control system, heater PTC control system, motor control system, DC / DC control system, and collision pre-judgment module. The motor executes the Active Stability Control System (ASC) at its maximum capacity, consuming excess energy through body heating. At the same time, the control system controls the coolant flow rate to the maximum and the fan speed to the maximum. The parameters of each component must be adjusted within its own unloading capacity.

2. A high-voltage unloading protection device based on collision pre-judgment logic, characterized in that, include: Collision pre-judgment module and high-pressure unloading parameter processing module; The collision pre-judgment module is used to acquire parameters from multiple vehicle controllers when a collision is about to be triggered, and to determine the pre-collision level of the vehicle based on the parameters. The high-voltage unloading parameter processing module is used to adjust the unloading parameters of various high-voltage electrical components of the vehicle according to the pre-collision level. The relevant parameters interacted by the various controllers of the vehicle include vehicle speed, acceleration, gear, accelerator pedal opening, brake pedal travel, ABS activation status, AEB activation status, distance between the vehicle and the obstacle in front, and relative speed between the vehicle and the obstacle in front. The pre-collision levels include Level 0 pre-collision, Level 1 pre-collision, Level 2 pre-collision, and Level 3 pre-collision. The criteria for judging a level 0 pre-collision collision are: No pre-collision level greater than zero was triggered. If the current pre-collision level is greater than zero, then the pre-collision level is equal to zero pre-collision level if any of the following conditions are met: The accelerator pedal opening is greater than parameter U4, the brake pedal opening is less than parameter B4, and the deceleration is less than parameter A4. The criteria for Level 1 pre-collision detection are: The following conditions must be met simultaneously: the current gear is D, the accelerator pedal opening is less than parameter U1, the brake pedal opening is greater than parameter B1, the deceleration is greater than parameter A1, and the current vehicle speed is greater than parameter V1. Or ABS activation; The criteria for determining a Level 2 pre-collision event are: The following conditions must be met simultaneously: the current gear is in D, ABS is activated, the accelerator pedal opening is less than parameter U2, the brake pedal opening is greater than parameter B2, the brake pedal travel change rate is greater than parameter db1 during the current braking cycle, the deceleration is greater than parameter A2, and the current vehicle speed is greater than parameter V2. The criteria for Level 3 pre-collision judgment are: The following conditions must be met simultaneously: the current gear is in D, ABS is activated, the accelerator pedal opening is less than parameter U3, the brake pedal opening is greater than parameter B3, the brake pedal travel change rate is greater than parameter db2 during the current braking cycle, the deceleration is greater than parameter A3, and the current vehicle speed is greater than parameter V3. Or the following conditions must be met simultaneously: the current gear is in D, AEB is activated, and the pre-collision time is less than the collision time t1; The collision time t1 is calculated based on the distance and relative speed between the forward-looking obstacle and the vehicle; The following parameters of the pre-collision ratings were calibrated through real vehicle testing: U1, U2, U3, U4, A1, A2, A3, A4, B1, B2, B3, B4, V1, V2, V3, db1, and db2; The high-pressure unloading parameter processing module is specifically used for: Set initial unloading parameters for each high-voltage electrical component; When the high-voltage unloading parameter processing module receives the level zero pre-collision signal, the control of each high-voltage electrical component is implemented according to the initial unloading parameters. When the high-voltage unloading parameter processing module receives the first-level pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to half of the initial unloading parameters, including the control command parameters and the execution parameters. The unloading time is halved, and high-voltage energy management is executed according to the original requirements. When the high-voltage unloading parameter processing module receives the secondary pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to execute according to its fastest unloading capacity, and high-voltage energy management is executed according to the original requirements. When the high-voltage unloading parameter processing module receives the level 3 pre-collision signal, each high-voltage electrical component adjusts its unloading parameters to perform according to its fastest unloading capacity. The high-voltage energy management module requests the shutdown of the heat pump control system, compressor control system, PTC control system, motor control system, DC / DC control system, and collision pre-judgment module. The motor performs ASC according to the system's maximum capacity, consuming excess energy through its own heat generation. At the same time, the control system controls the coolant flow rate to the maximum and the fan speed to the maximum. The parameters of each component must be adjusted within its own unloading capacity.

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