Bridge active discharging method and device, medium and vehicle

Abstract

The invention relates to the field of automobile control, and particularly discloses a bridge active discharging method and device and a vehicle. The method comprises the steps that battery pack monitoring data and bus capacitor voltage of the vehicle are acquired, and the battery pack monitoring data at least comprise output voltage of a low-voltage battery pack; when the output voltage of the low-voltage battery pack is lower than a first voltage threshold value, judging whether an emergency discharge condition is met or not; and if the emergency discharge condition is met, intermittent emergency discharge is carried out on the bus capacitor. By monitoring the battery pack monitoring data of the vehicle, the opportunity of active discharging of the bus capacitor can be determined, and then the effectiveness of active discharging strategy execution is ensured. The battery pack monitoring data and the bus capacitor voltage of the vehicle are monitored, and whether the emergency discharge condition is met is judged on the basis, so that the timeliness of executing the emergency discharge action is ensured, and the electric shock risk of maintenance personnel is reduced.

Description

Technical Field

[0001] The present application relates to the field of automobile control, and in particular to a bridge active discharge method, device, medium and vehicle. Background Art

[0002] In the prior art, when the output voltage of a vehicle's low-voltage battery pack (such as a lead-acid battery) is abnormal (such as too low voltage), the vehicle controller (Hybrid Control Unit, HCU) cannot request the electric drive axle to actively discharge according to the high-voltage system power-off process. At this time, if maintenance personnel or passengers touch the high-voltage bus, there is a risk of electric shock. Summary of the Invention

[0003] In view of the above problems, the present disclosure provides a bridge active discharge method, device and vehicle that overcome the above problems or at least partially solve the above problems. The technical solutions are as follows:

[0004] A bridge active discharge method includes: obtaining battery pack monitoring data and bus capacitor voltage of a vehicle, wherein the battery pack monitoring data includes at least the output voltage of a low-voltage battery pack; when the output voltage of the low-voltage battery pack is lower than a first voltage threshold, determining whether an emergency discharge condition is met; and if the emergency discharge condition is met, performing intermittent emergency discharge on the bus capacitor.

[0005] Optionally, the battery pack monitoring data also includes the contactor status of the high-voltage battery pack; the emergency discharge condition includes the contactor status being in a disconnected state.

[0006] When determining whether the bus capacitor needs emergency discharge, adding the contactor status of the high-voltage battery pack as a reference factor can improve the timeliness and effectiveness of the emergency discharge strategy.

[0007] Optionally, the intermittent emergency discharge of the bus capacitor specifically includes: repeatedly performing stage discharge actions until the discharge stopping condition is met; the stage discharge action includes: emergency discharge of the bus capacitor within a first preset time length; and stopping emergency discharge of the bus capacitor within a second preset time length after the first preset time length.

[0008] During the intermittent emergency discharge of the bus capacitor, the discharge module for performing the emergency discharge of the bus capacitor can be protected by intermittent emergency discharge.

[0009] Optionally, the condition for stopping discharging is: the bus capacitor voltage is not higher than a second voltage threshold, and at least one of a status request instruction from a vehicle controller is received.

[0010] By including the status request command sent by the vehicle controller as a stop-discharge condition, the motor controller can resume normal functioning when the low-voltage battery pack's output voltage returns to normal during the emergency discharge process. This prevents the busbar capacitor from being in an emergency discharge state, which could lead to rear axle failure or even vehicle stall. Furthermore, it prevents continued driving using the front axle or engine, which could damage the axle.

[0011] Optionally, the intermittent emergency discharge of the bus capacitor specifically includes: obtaining the cumulative duration of the intermittent emergency discharge of the bus capacitor; if the cumulative duration is higher than a third preset duration, sending a discharge timeout signal to the vehicle controller, and continuing to perform intermittent emergency discharge of the bus capacitor; if the cumulative duration is higher than a fourth preset duration, sending a discharge failure signal to the vehicle controller.

[0012] During intermittent emergency discharge of the bus capacitor, the accumulated time is monitored to determine whether the discharge process has timed out or failed, thereby avoiding discharge failure without subsequent response, which may lead to rear axle failure or vehicle stall, and electric shock.

[0013] Optionally, after obtaining the vehicle's battery pack monitoring data and bus capacitor voltage, the method also includes: when the output voltage of the low-voltage battery pack is not lower than a first voltage threshold, determining whether an active discharge condition is met; if the active discharge condition is met, actively discharging the bus capacitor.

[0014] When the output voltage of the low-voltage battery pack is normal, the vehicle's existing discharge modules, such as the motor controller, can be controlled by the vehicle controller to actively discharge the bus capacitor, thereby reducing the risk of electric shock for maintenance personnel or passengers.

[0015] Optionally, the intermittent emergency discharge of the bus capacitor specifically includes: obtaining distance information between each candidate within a preset range of the vehicle and the bus end; based on the distance information, determining the target person closest to the bus end, and the target distance between the target person and the bus end; based on the target distance change value within a preset time period, determining the reserved discharge time of the bus capacitor; determining the voltage difference between the bus capacitor voltage and the second voltage threshold; based on the voltage difference and the reserved discharge time, determining the emergency discharge speed of the bus capacitor.

[0016] Based on the distance between the target person and the bus terminal, the emergency discharge speed corresponding to the bus capacitor is determined, thereby balancing safety and component life, avoiding the occurrence of electrical rebound, and reducing the electromagnetic interference to the entire vehicle system when the discharge speed is too high.

[0017] The present application also provides an electric bridge active discharge device, including: a data acquisition module, which acquires the vehicle's battery pack monitoring data and bus capacitor voltage, and the battery pack monitoring data at least includes the output voltage of the low-voltage battery pack; a condition judgment module, which determines whether the emergency discharge condition is met when the output voltage of the low-voltage battery pack is lower than a first voltage threshold; and a discharge execution module, which performs intermittent emergency discharge on the bus capacitor if the emergency discharge condition is met.

[0018] The present application also provides a non-volatile computer storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to: obtain battery pack monitoring data and bus capacitor voltage of a vehicle, wherein the battery pack monitoring data includes at least the output voltage of a low-voltage battery pack; when the output voltage of the low-voltage battery pack is lower than a first voltage threshold, determine whether an emergency discharge condition is met; if the emergency discharge condition is met, perform intermittent emergency discharge on the bus capacitor.

[0019] The present application also provides a vehicle, comprising: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute: obtaining the vehicle's battery pack monitoring data and bus capacitor voltage, the battery pack monitoring data including at least the output voltage of a low-voltage battery pack; when the output voltage of the low-voltage battery pack is lower than a first voltage threshold, determining whether an emergency discharge condition is met; if the emergency discharge condition is met, performing intermittent emergency discharge on the bus capacitor.

[0020] By leveraging the aforementioned technical solution, the present disclosure provides a bridge active discharge method, device, medium, and vehicle. By monitoring the vehicle's battery pack data and bus capacitor voltage, and determining whether emergency discharge conditions are met when the output voltage of the low-voltage electric vehicle pack decreases, the method ensures the timeliness and effectiveness of emergency discharge. Furthermore, when emergency discharge conditions are met, intermittent discharge is used to perform emergency discharge, protecting the discharge module performing the discharge action.

[0021] The above description is only an overview of the technical solution of the present disclosure. In order to more clearly understand the technical means of the present disclosure, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present disclosure more obvious and easy to understand, the specific implementation methods of the present disclosure are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present disclosure. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0023] Figure 1 This is a flow chart of a bridge active discharge method according to an embodiment of the present application;

[0024] Figure 2 This is a structural diagram of an electric bridge active discharge device in an embodiment of the present application;

[0025] Figure 3 This is a structural diagram of a vehicle in an embodiment of the present application. DETAILED DESCRIPTION

[0026] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0027] When the 12V output voltage of the vehicle's low-voltage battery pack (such as a lead-acid battery) is abnormal (such as the voltage is too low), it will cause abnormal power supply to each electronic control unit (ECU). At this time, the vehicle controller will not be able to request the electric drive axle to actively discharge according to the normal power-off process. If the contactor of the high-voltage battery pack is disconnected at this time, it can only rely on the bus capacitor for passive discharge. This process takes a long time, and during the passive discharge process, if maintenance personnel or passengers are close to the high-voltage bus, there is a risk of electric shock.

[0028] In order to solve the above technical problems, Figure 1 This is a flow chart of a bridge active discharge method provided in one or more embodiments of this specification. This method can be used to perform emergency discharge of busbar capacitance when the output voltage of a low-voltage battery pack is abnormal. The process can be executed by a computing device in the corresponding field (such as a cloud server or a smart mobile terminal installed in a vehicle). Certain input parameters or intermediate results in the process can be manually adjusted to help improve accuracy.

[0029] The analysis methods involved in the embodiments of this application can be implemented on a terminal device or a server, and this application does not impose any special restrictions on this. For ease of understanding and description, the following embodiments are described in detail using the vehicle computer in a vehicle as an example. It should be noted that the vehicle computer can be a single device or a system composed of multiple devices, that is, a distributed server, and this application does not impose any specific restrictions on this.

[0030] like Figure 1 As shown, the embodiment of the present application provides a bridge active discharge method, including:

[0031] S101: Obtain the vehicle's battery pack monitoring data and bus capacitor voltage.

[0032] First, the motor controller obtains the battery pack monitoring data and bus capacitor voltage corresponding to the vehicle. The battery pack monitoring data here includes at least the output voltage of the low-voltage battery pack, that is, the voltage of the positive electrode (Klemme30, KL30) of the normal power supply. Among them, the low-voltage battery pack refers to the battery pack in the vehicle used to power low-voltage devices, and its corresponding output voltage is a low voltage (such as 12V). Under normal operating conditions, the DC-DC converter converts the bus high voltage power from the high-voltage battery pack into a 12V voltage for charging the low-voltage battery pack. The type of low-voltage battery pack can be a lead-acid battery or a lithium battery. The bus capacitor voltage here refers to the voltage value corresponding to the bus capacitor. When maintenance personnel perform bus terminal operations, in order to ensure the personal safety of maintenance personnel, the bus capacitor voltage corresponding to the bus capacitor should be reduced to below a preset voltage threshold (such as 55V) to avoid electric shock to maintenance personnel. When obtaining battery pack monitoring data, the motor controller can monitor the battery pack monitoring data in real time, or it can obtain battery pack monitoring data once at a preset interval.

[0033] S102: When the output voltage of the low-voltage battery pack is lower than a first voltage threshold, determine whether an emergency discharge condition is met.

[0034] If the output voltage of the low-voltage battery pack is abnormal (e.g., too low), the electric drive axle will not be able to discharge the capacitor according to the normal power-off process because it is not receiving normal power from the low-voltage battery pack. If maintenance personnel or passengers are close to the high-voltage bus at this time, there is a risk of electric shock. Therefore, it is necessary to determine whether emergency discharge of the bus capacitor is necessary to avoid electric shock for maintenance personnel or passengers.

[0035] In one embodiment, when judging whether the bus capacitor meets the emergency discharge conditions, since the output voltage of the low-voltage battery pack is abnormal at this time, such as lower than the first voltage threshold. At this time, it is necessary to obtain the contactor status of the high-voltage battery pack and judge whether the contactor status of the high-voltage battery pack is disconnected. When the contactor status of the high-voltage battery pack is disconnected, it is considered that the emergency discharge conditions are met. At this time, it is necessary to perform emergency discharge of the bus capacitor to reduce the bus capacitor voltage to a safe range (lower than the preset voltage threshold).

[0036] When it is detected that the output voltage of the low-voltage battery pack is lower than the first voltage threshold, the main positive contactor and the main negative contactor of the high-voltage battery pack may stick together, causing the high-voltage circuit to be continuously conductive, and thus the bus capacitor to be continuously charged. At this time, intermittent emergency discharge may not be able to quickly reduce the bus capacitor voltage to a safe range (lower than the preset voltage threshold). Therefore, intermittent emergency discharge can only be more effective when the contactor of the high-voltage battery pack is in the disconnected state.

[0037] Furthermore, after determining that the contactor state of the high-voltage battery pack is disconnected, it is possible to further determine whether emergency discharge is required based on the magnitude of the bus capacitor voltage. It is understandable that if the bus voltage is already within the safe range, there is no need to discharge the bus capacitor. However, if the bus voltage is not within the safe range (higher than the preset voltage threshold), it is considered that the emergency discharge condition is met and the bus capacitor needs to be urgently discharged.

[0038] During the above process, it is possible to gradually determine whether the emergency discharge conditions are met. For example, after the output voltage of the low-voltage battery pack falls below the first voltage threshold, the contactor status of the high-voltage battery pack can be obtained to determine whether the emergency discharge conditions are met. By gradually determining the emergency discharge conditions, the computing resources required for the determination process can be reduced. At the same time, when obtaining battery pack monitoring data and bus capacitor voltage, each type of battery pack monitoring data can be obtained separately. When the corresponding determination node is reached, the corresponding type of monitoring data can be obtained, thereby reducing the monitoring resources required by the motor controller to obtain monitoring data.

[0039] Possible causes of abnormal output voltage of the low-voltage battery pack include: DC-DC converter failure, battery power failure or loose wiring, fuse blown, power management module failure, abnormal vehicle sleep current causing battery depletion, etc.

[0040] S103: If the emergency discharge condition is met, intermittent emergency discharge is performed on the bus capacitor.

[0041] If the emergency discharge conditions are met, the bus capacitor can be intermittently discharged in an emergency through a preset discharge module, thereby quickly reducing the bus capacitor voltage while preventing the discharge module from being damaged by continuous discharge and heating, thereby protecting the discharge module. The discharge module here can use an insulated gate bipolar transistor (IGBT) module to implement the corresponding discharge function. Specifically, when the bus capacitor is urgently discharged through the IGBT module, the switching characteristics of the IGBT module are utilized. By controlling its conduction and shutdown, the energy of the bus capacitor is released through loads such as resistance or inductance. The IGBT module performs emergency discharge very quickly (actually about 700ms), which further ensures the timeliness of discharge, thereby reducing the risk of electric shock to users.

[0042] In one embodiment, when the bus capacitor is emergency discharged by the discharge module, a staged discharge operation needs to be repeatedly performed until a discharging stop condition is met. The staged discharge operation includes: performing emergency discharge of the bus capacitor for a first preset time period, and stopping the emergency discharge of the bus capacitor for a second preset time period after the first preset time period.

[0043] The first preset duration can be set to 10 seconds, and the second preset duration can be set to 30 seconds. The intermittent emergency discharge process can be summarized as follows: the discharge module first discharges the bus capacitor for 10 seconds, then pauses the emergency discharge for 30 seconds, and repeats this process until the discharge stop condition is met. When the discharge stop condition is met, the motor controller enters sleep mode.

[0044] In one embodiment, the discharging stop condition is that the bus capacitor voltage is not higher than the second voltage threshold or a status request instruction is received from the vehicle controller.

[0045] Here is an explanation of the above two conditions for stopping discharge: When the bus capacitor voltage is not higher than the second voltage threshold (such as 55V), there will be no risk of electric shock when the maintenance personnel disassemble the high-voltage wiring harness, so there is no need to perform emergency discharge of the bus capacitor. When a status request instruction is received from the vehicle controller, it means that during the emergency discharge of the bus capacitor, the output voltage of the low-voltage battery pack has returned to normal, and it is necessary to immediately exit the emergency discharge state to ensure that the motor controller can perform normal functions and avoid the bus capacitor being in an emergency discharge state, resulting in failure of the rear axle and stalling of the vehicle. At the same time, if the emergency discharge state is not exited, continued use of the front axle or the engine to continue driving may cause damage to the axle.

[0046] This technical solution takes into account the situation where the output voltage of the low-voltage battery pack returns to normal operating conditions during emergency discharge. If a status instruction request is received from the vehicle controller during emergency discharge, the emergency active discharge can be exited immediately to ensure that the normal functions of the motor controller can continue to be executed, thereby ensuring the stability of the emergency discharge process.

[0047] In one embodiment, if the emergency discharge process is abnormal and causes the emergency discharge process to last for a long time, it may cause the rear axle to fail or the whole vehicle to stall. To avoid this situation, it is necessary to actively judge the execution status of the emergency discharge action. At this time, the cumulative duration of intermittent emergency discharge of the bus capacitor can be obtained, and the execution status of the emergency discharge action can be judged based on the cumulative duration. For example, if the cumulative duration is higher than the third preset duration, a discharge timeout signal is sent to the vehicle controller, and intermittent emergency discharge of the bus capacitor is continued. If, on this basis, the cumulative duration is higher than the fourth preset duration, and the condition for stopping discharge is still not met, a discharge failure signal is sent to the vehicle controller so that the vehicle controller can respond according to the execution status, such as using the vehicle computer to warn the passengers.

[0048] In one embodiment, when the output voltage of the low-voltage battery pack is normal, the vehicle controller can control existing discharge modules such as the motor controller to actively discharge the bus capacitor normally, thereby reducing the risk of electric shock to maintenance personnel or passengers. Specifically, when the output voltage of the low-voltage battery pack is not lower than a first voltage threshold, it is determined whether the active discharge condition is met; if the active discharge condition is met, the bus capacitor is actively discharged. The active discharge condition here refers to receiving a discharge request from the vehicle controller.

[0049] In one embodiment, a distance sensor can also be set at the bus end to determine the distance between each person and the bus end, thereby preventing electric shock incidents. Since the output voltage of the low-voltage battery pack is abnormal, it will cause problems in the power supply of other low-voltage electronic devices. Therefore, in order to ensure the normal operation of the distance sensor, an independent battery pack can be used to independently power the distance sensor so that the distance sensor can monitor the distance information between the bus end and other people within the range even when the output voltage of the low-voltage battery pack is abnormal. The distance information here can be used as a condition for judging whether the bus capacitor needs to be discharged urgently. Specifically, after determining that the output voltage is lower than the first voltage threshold, the contactor state is disconnected, and the bus capacitor voltage is higher than the second voltage threshold, the distance information of each candidate within the preset range of the vehicle and the bus end can be obtained through the distance sensor, wherein the distance sensor is powered by an independent battery pack. If the distance information at this time indicates that the distance between the candidate within the preset range of the vehicle and the bus end is lower than the preset distance threshold, then the bus capacitor meets the emergency discharge condition. It can be understood that if the distance between all the selected personnel and the bus end within the preset range of the vehicle is higher than the preset distance threshold, there is no risk of electric shock for personnel in a short period of time. Therefore, the bus capacitor voltage does not need to be urgently discharged in a short period of time, and a passive discharge strategy can be adopted, that is, the bus capacitor voltage of the bus capacitor is slowly reduced to below the second voltage threshold over a longer period of time.

[0050] By acquiring the distance between the vehicle bus terminal and nearby personnel and using this distance information as one of the factors in determining whether emergency discharge conditions are met, the bus capacitor voltage discharge method can be determined based on the distance between the personnel, the vehicle, and the bus terminal. Therefore, when the personnel are far away from the vehicle, only passive discharge strategies can be used to reduce the bus capacitor voltage to a safe range. This avoids component damage caused by sudden current changes during emergency discharge of the bus capacitor.

[0051] In one embodiment, the distance sensor can be powered by an independent battery pack. The distance sensor only obtains distance information between the user and the busbar terminal after the corresponding protective cover (such as the vehicle's front compartment cover, chassis guard, battery pack cover, etc.) is opened. Furthermore, the independent battery pack can be connected to the high-voltage battery pack via a DC-DC converter. When the output voltage of the low-voltage battery pack is within normal operating conditions, the high-voltage battery pack can charge the independent battery pack. When the output voltage of the low-voltage battery pack is below normal operating conditions, the independent battery pack can power the distance sensor.

[0052] Furthermore, after determining the distance between the target person and the bus terminal, the emergency discharge speed of the bus capacitor can be regulated based on the distance between the target person and the bus terminal. It should be noted that if the emergency discharge speed is too fast, the bus capacitor voltage corresponding to the bus capacitor drops too fast, and the large current impact may damage the discharge resistor or capacitor, shortening the life of the component. And if the discharge is too fast, the inductance (such as cable parasitic inductance) and the capacitance may form LC oscillation, resulting in a brief voltage rebound (even if the discharge is complete). At the same time, discharging too quickly will produce high-frequency current changes, radiate electromagnetic noise, and interfere with sensitive circuits (such as BMS, sensors). Therefore, by regulating the emergency discharge speed of the bus capacitor, it is possible to balance safety and component life.

[0053] Specifically, when regulating the emergency discharge speed of the bus capacitor based on the distance between the target person and the bus terminal, it is necessary to determine the target person closest to the bus terminal and the target distance between the target person and the bus terminal based on the distance information. Furthermore, based on the target distance change within a preset time period, the reserved discharge time for the bus capacitor is determined, and then the voltage difference between the current bus capacitor voltage and the second voltage threshold is determined. Finally, the emergency discharge speed of the bus capacitor can be determined based on the voltage difference and the reserved discharge time.

[0054] The target distance change value within the preset time period refers to the speed of the target person approaching the bus end. After knowing the instantaneous speed of the target person approaching the bus end and the distance between the target person and the bus end, the reserved discharge time of the bus capacitor can be calculated. The reserved discharge time here refers to the time required for the target person to approach the bus end at the current instantaneous speed until the distance between the target person and the bus end equals the danger distance. The bus capacitor can determine the emergency discharge speed of the bus capacitor based on the voltage difference within the reserved discharge time. For example, the voltage drop value per unit time can be obtained by dividing the voltage difference by the reserved discharge time, and the voltage drop value per unit time is used as the emergency discharge speed of the bus capacitor.

[0055] It is understandable that the emergency discharge speed of the bus capacitor is inversely proportional to the reserved discharge time and directly proportional to the target distance change value within the preset time period, and the specific proportional coefficient can be calibrated in advance. The above-mentioned proportional coefficient can be pre-stored in the storage device of the computer device. When the emergency discharge speed needs to be calculated, the computer device can select the proportional coefficient from the storage device. Of course, the computer device can also obtain the proportional coefficient from other external devices. For example, the proportional coefficient is stored in the cloud. When the emergency discharge speed needs to be calculated, the computer device can obtain the proportional coefficient from the cloud. This embodiment does not limit the method of obtaining the proportional coefficient.

[0056] By controlling the discharge speed of the bus capacitor through the distance between the target person and the bus terminal of the vehicle, it is possible to minimize damage to the vehicle's components caused by excessive discharge speed during the discharge process, thereby increasing the life of the components in the vehicle.

[0057] Among them, the emergency discharge speed of the bus capacitor can also be determined by constructing a mathematical model. The model used to determine the emergency discharge speed of the bus capacitor can be a mathematical model constructed based on a machine learning algorithm, including but not limited to a neural network model, a support vector machine model, etc. The constructed discharge speed determination model is pre-trained through a training data set. When the set training precision and accuracy are reached, it is determined that the discharge speed determination model of the current training has completed training so that it can be used to determine the emergency discharge speed of the bus capacitor.

[0058] In one embodiment, when a candidate other than the target person approaches the bus terminal quickly, causing the bus capacitor to not have time to reduce the bus capacitor voltage to a safe voltage, or the emergency discharge strategy of the bus capacitor is in the second preset time period of suspending the emergency discharge of the bus capacitor through the insulated gate bipolar transistor module, if the target person or other person approaches the bus terminal quickly at this time, it is necessary to warn the approaching person. When the alarm is given, an independently powered alarm device can be used. The alarm device here can be an alarm signal light, a loudspeaker, etc., and the corresponding alarm method can be a signal light alarm, a loudspeaker alarm, etc. By setting up an alarm device, it is possible to prevent the target person from accidentally touching the bus and causing an electric shock accident when the bus capacitor voltage is high, thereby improving the safety of maintenance personnel when operating the bus terminal.

[0059] In one embodiment, when the output voltage of the low-voltage battery pack drops abnormally from the normal range (e.g., between 11V and 13V) (e.g., due to a DC-DC converter failure), the low-voltage battery pack can still supply power to the low-voltage electrical components before it drops below a first voltage threshold, meaning the vehicle can still be driven. To ensure the driver's convenience and safety in repairing the vehicle, a nearby repair shop or safe location (e.g., a road section with traffic below a preset threshold) can be identified and the recommended destination pushed to the driver.

[0060] Specifically, when the motor controller detects that the output voltage of the low-voltage battery pack is lower than a third voltage threshold (such as 11V), the current location information of the vehicle can be obtained at this time, and based on the specifications of the low-voltage battery pack and the current location information, the recommended destination closest to the vehicle can be determined. The driver of the vehicle is then prompted that the output voltage of the low-voltage battery pack has dropped abnormally, and the recommended destination is pushed. Specifically, based on the specifications of the low-voltage battery pack and the current output voltage value of the low-voltage battery pack, the remaining mileage that the current low-voltage battery pack can support can be estimated. Based on the remaining mileage and the current location information of the vehicle, the number of repair shops or sections of road with traffic volume lower than a preset threshold within the circle with the current location of the vehicle as the center and the remaining mileage as the radius is determined. The above-mentioned repair shops or sections of road with traffic volume lower than the preset threshold are recommended destinations and pushed to the driver of the vehicle together with the reminder of the abnormal drop in the output voltage of the low-voltage battery pack. The push method can be through car push, SMS push, etc.

[0061] In addition, if Figure 2 As shown, the embodiment of the present application further provides a bridge active discharge device, comprising:

[0062] The data acquisition module 201 acquires the battery pack monitoring data and bus capacitor voltage of the vehicle, wherein the battery pack monitoring data at least includes the output voltage of the low-voltage battery pack.

[0063] The condition determination module 202 determines whether an emergency discharge condition is met when the output voltage of the low-voltage battery pack is lower than a first voltage threshold.

[0064] The discharge execution module 203 performs intermittent emergency discharge on the bus capacitor if the emergency discharge condition is met.

[0065] In a specific embodiment, the battery pack monitoring data acquired by the data acquisition module 201 includes the output voltage of the low-voltage battery pack; and the emergency discharge condition stored in the condition determination module 202 is that the contactor state is in the disconnected state.

[0066] In a specific embodiment, the discharge execution module 203 is specifically configured to perform an intermittent emergency discharge operation on the bus capacitor until a discharging stop condition is met; the intermittent emergency discharge operation includes:

[0067] The bus capacitor is urgently discharged within a first preset time period; and the emergency discharge of the bus capacitor is stopped within a second preset time period after the first preset time period.

[0068] In a specific embodiment, the discharging stop condition stored in the discharging execution module 203 is that the bus capacitor voltage is not higher than the second voltage threshold, and / or a status request instruction is received from the vehicle controller.

[0069] In a specific embodiment, the emergency discharge module 203 is used to obtain the cumulative time for the bus capacitor to perform intermittent emergency discharge actions; if the cumulative time is higher than the third preset time, a discharge timeout signal is sent to the vehicle controller, and intermittent emergency discharge actions are continuously performed on the bus capacitor; if the cumulative time is higher than the fourth preset time, a discharge failure signal is sent to the vehicle controller.

[0070] In a specific embodiment, the condition determination module 202 is used to determine whether the active discharge condition is met when the output voltage of the low-voltage battery pack is not lower than the first voltage threshold; if the active discharge condition is met, the bus capacitor is actively discharged by controlling the motor controller.

[0071] In a specific embodiment, the condition judgment module 202 is specifically used to obtain the distance information of each candidate within a preset range of the vehicle and the bus end through a distance sensor, and the distance sensor is powered by an independent battery pack; based on the distance information, determine the target person closest to the bus end, and the target distance between the target person and the bus end; based on the target distance change value within a preset time period, determine the reserved discharge time of the bus capacitor; determine the voltage difference between the bus capacitor voltage and the second voltage threshold; based on the voltage difference and the reserved discharge time, determine the emergency discharge speed of the bus capacitor.

[0072] In a specific embodiment, the emergency discharge module 203 is specifically used to determine whether the bus capacitor voltage is higher than the second voltage threshold; if the target distance between the target person and the bus end is lower than the alarm distance threshold; then an alarm is issued to the target person through an alarm device, and the alarm device is powered by the independent battery pack.

[0073] In a specific embodiment, after the motor controller obtains the battery pack monitoring data of the vehicle, the condition judgment module 202 is also used to: determine that the output voltage is lower than a third voltage threshold; obtain the current location information of the vehicle; determine the recommended destination closest to the vehicle based on the specifications of the low-voltage battery pack and the current location information; prompt the driver of the vehicle of the abnormal drop in output voltage and push the recommended destination.

[0074] An embodiment of the present application also provides a non-volatile computer storage medium storing computer-executable instructions, wherein the computer-executable instructions are configured to: obtain battery pack monitoring data and bus capacitor voltage of a vehicle, wherein the battery pack monitoring data includes at least the output voltage of a low-voltage battery pack; when the output voltage of the low-voltage battery pack is lower than a first voltage threshold, determine whether an emergency discharge condition is met; if the emergency discharge condition is met, perform intermittent emergency discharge on the bus capacitor.

[0075] like Figure 3 As shown, an embodiment of the present application further provides a vehicle, which includes: a memory 301 and a processor 302, wherein the memory 301 stores an executable program code 3011, and the processor 302 is used to call and execute the executable program code 3011 to perform the bridge active discharge method.

[0076] This embodiment can divide the vehicle into functional modules based on the above-described method example. For example, each functional module can be mapped to a specific function, or two or more functions can be integrated into a single processing module. The integrated module can be implemented in hardware. It should be noted that the module division in this embodiment is illustrative and represents only one logical functional division. In actual implementation, other division methods may be used.

[0077] In the case of dividing each functional module into corresponding functional modules, the vehicle may include:

[0078] A data acquisition module, which acquires the vehicle's battery pack monitoring data and bus capacitor voltage, wherein the battery pack monitoring data includes at least the output voltage of the low-voltage battery pack;

[0079] a condition determination module, configured to determine whether an emergency discharge condition is met when the output voltage of the low-voltage battery pack is lower than a first voltage threshold;

[0080] The discharge execution module performs intermittent emergency discharge on the bus capacitor if the emergency discharge condition is met.

[0081] It should be noted that all relevant contents of each step involved in the above method embodiment can be referred to the functional description of the corresponding functional module and will not be repeated here.

[0082] The vehicle provided in this embodiment is used to execute the above-mentioned bridge active discharge method, and thus can achieve the same effect as the above-mentioned implementation method.

[0083] In the case of an integrated unit, the vehicle may include a processing module and a storage module. The processing module may be used to control and manage the vehicle's movements, while the storage module may be used to support the vehicle's execution of program codes and data.

[0084] The processing module may be a processor or controller that implements or executes various exemplary logic blocks, modules, and circuits disclosed herein. The processor may also be a combination that implements computing functions, such as a combination of one or more microprocessors, a combination of a digital signal processing (DSP) and a microprocessor, and the storage module may be a memory.

[0085] This embodiment also provides a computer-readable storage medium, which stores computer program code (including but not limited to disk storage, CD-ROM, optical storage, etc.). When the computer program code is run on a computer, the computer executes the above-mentioned related method steps to implement the bridge active discharge method provided in the above embodiment.

[0086] This embodiment also provides a computer program product. When the computer program product is run on a computer, it enables the computer to execute the above-mentioned related steps to implement the vehicle torque control method provided by the above embodiment.

[0087] Among them, the beneficial effects of the above embodiments can refer to the beneficial effects of the corresponding methods provided above, and will not be repeated here.

[0088] Through the description of the above implementation methods, technical personnel in the relevant field can understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be distributed and completed by different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0089] In the embodiments provided in this application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of modules or units is only a logical function division. In actual implementation, there may be other division methods, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0090] In the description of the present disclosure, it should be understood that if the terms "up", "down", "front", "back", "left" and "right" are used to indicate directions or positional relationships, they are based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the positions or elements referred to must have a specific direction, be constructed and operate in a specific direction. Therefore, they should not be understood as limitations of the present disclosure.

[0091] The devices and media provided in the embodiments of the present application correspond one-to-one to the methods. Therefore, the devices and media also have similar beneficial technical effects to their corresponding methods. Since the beneficial technical effects of the methods have been described in detail above, the beneficial technical effects of the devices and media will not be repeated here.

[0092] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0093] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0094] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0095] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0096] In a typical configuration, a computing device includes one or more processors (CPUs), input / output interfaces, network interfaces, and memory.

[0097] Memory may include non-permanent storage in a computer-readable medium, random access memory (RAM) and / or non-volatile memory in the form of read-only memory (ROM) or flash RAM. Memory is an example of a computer-readable medium.

[0098] Computer-readable media includes permanent and non-permanent, removable and non-removable media that can be implemented by any method or technology to store information. The information can be computer-readable instructions, data structures, program modules or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), static random access memory (SRAM), dynamic random access memory (DRAM), other types of random access memory (RAM), read-only memory (ROM), electrically erasable programmable read-only memory (EEPROM), flash memory or other memory technology, compact disc read-only memory (CD-ROM), digital versatile disc (DVD) or other optical storage, magnetic cassettes, magnetic tape, magnetic disk storage or other magnetic storage devices or any other non-transmission media that can be used to store information that can be accessed by a computing device. As defined herein, computer-readable media does not include transitory computer-readable media (transitory media), such as modulated data signals and carrier waves.

[0099] It should also be noted that the terms "comprises," "includes," or any other variations thereof are intended to encompass non-exclusive inclusion, such that a process, method, commodity, or apparatus that includes a series of elements includes not only those elements but also other elements not explicitly listed, or includes elements inherent to such process, method, commodity, or apparatus. In the absence of further limitations, an element defined by the phrase "comprises a ..." does not exclude the presence of other identical elements in the process, method, commodity, or apparatus that includes the element.

[0100] The foregoing is merely an embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various changes and variations. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present application should all be included within the scope of the claims of the present application.

Claims

1. A bridge active discharge method, characterized in that: include: Obtaining battery pack monitoring data and bus capacitor voltage of the vehicle, wherein the battery pack monitoring data includes at least the output voltage of the low-voltage battery pack; When the output voltage of the low-voltage battery pack is lower than a first voltage threshold, determining whether an emergency discharge condition is met; If the emergency discharge condition is met, intermittent emergency discharge is performed on the bus capacitor.

2. The method according to claim 1, characterized in that The battery pack monitoring data also includes the contactor status of the high-voltage battery pack; The emergency discharge condition includes the contactor being in an open state.

3. The method according to claim 1, characterized in that The intermittent emergency discharge of the bus capacitor specifically includes: Repeat the stage discharge action until the discharge stop condition is met; The stage discharge action includes: emergency discharge of the bus capacitor within a first preset time period; The emergency discharge of the bus capacitor is stopped within a second preset time period after the first preset time period.

4. The method according to claim 3, characterized in that The discharging stop condition includes at least one of: the bus capacitor voltage is not higher than a second voltage threshold, and a status request instruction is received from a vehicle controller.

5. The method according to claim 1, wherein The intermittent emergency discharge of the bus capacitor specifically includes: Obtaining the cumulative duration of intermittent emergency discharge of the bus capacitor; If the accumulated time is longer than a third preset time, a discharge timeout signal is sent to the vehicle controller, and intermittent emergency discharge of the bus capacitor is continued; If the accumulated time is longer than a fourth preset time, a discharge failure signal is sent to the vehicle controller.

6. The method according to claim 1, wherein After obtaining the vehicle's battery pack monitoring data and bus capacitor voltage, the method further includes: When the output voltage of the low-voltage battery pack is not lower than the first voltage threshold, determining whether an active discharge condition is met; If the active discharge condition is met, the bus capacitor is actively discharged.

7. The method according to claim 1, characterized in that The intermittent emergency discharge of the bus capacitor specifically includes: Obtain the distance information between each candidate and the busbar end within the preset range of the vehicle; Determining, based on the distance information, a target person closest to the busbar end and a target distance between the target person and the busbar end; Determining a reserved discharge time of the bus capacitor based on a target distance change value within a preset time period; determining a voltage difference between the bus capacitor voltage and a second voltage threshold; An emergency discharge speed of the bus capacitor is determined based on the voltage difference and the reserved discharge time.

8. A bridge active discharge device, characterized in that: include: A data acquisition module, which acquires the vehicle's battery pack monitoring data and bus capacitor voltage, wherein the battery pack monitoring data includes at least the output voltage of the low-voltage battery pack; a condition determination module, configured to determine whether an emergency discharge condition is met when the output voltage of the low-voltage battery pack is lower than a first voltage threshold; The discharge execution module performs intermittent emergency discharge on the bus capacitor if the emergency discharge condition is met.

9. A non-volatile computer storage medium storing computer executable instructions, characterized in that: The computer executable instructions are configured to: Obtaining battery pack monitoring data and bus capacitor voltage of the vehicle, wherein the battery pack monitoring data includes at least the output voltage of the low-voltage battery pack; When the output voltage of the low-voltage battery pack is lower than a first voltage threshold, determining whether an emergency discharge condition is met; If the emergency discharge condition is met, intermittent emergency discharge is performed on the bus capacitor.

10. A vehicle, characterized in that: include: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores instructions executable by the at least one processor, wherein the instructions are executed by the at least one processor to enable the at least one processor to perform: Obtaining battery pack monitoring data and bus capacitor voltage of the vehicle, wherein the battery pack monitoring data includes at least the output voltage of the low-voltage battery pack; When the output voltage of the low-voltage battery pack is lower than a first voltage threshold, determining whether an emergency discharge condition is met; If the emergency discharge condition is met, intermittent emergency discharge is performed on the bus capacitor.

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