Current protection method and device of electric drive system, electronic equipment and storage medium

Abstract

The invention relates to a current protection method and device of an electric drive system, electronic equipment and a storage medium, and the method comprises the steps: determining a target overcurrent protection threshold value corresponding to an actual working mode according to the actual working mode of the electric drive system; and performing overcurrent protection control on the electric drive system according to the target overcurrent protection threshold. According to the invention, by dynamically adapting to the overcurrent protection threshold values in different working modes, the current protection range of the electric drive system can be effectively widened, and the protection capability of key hardware such as a motor winding and a functional device is improved, so that the operation reliability of the electric drive system is improved, and the service life of the electric drive system is prolonged.

Description

Technical Field

[0001] This disclosure relates to the field of electric drive system technology, and in particular to a current protection method, device, electronic device and storage medium for an electric drive system. Background Technology

[0002] In applications such as electric vehicles and industrial drives, the electric drive system serves as a core power component, and its operational stability significantly impacts the overall system performance. During actual operation, factors such as sudden load changes and control anomalies can lead to abnormally high currents. Excessive current will subject critical hardware components within the electric drive system (such as motor windings and power semiconductor devices) to current stress exceeding their design tolerances, resulting in component damage, performance degradation, or even functional failure, severely impacting the operational reliability and lifespan of the electric drive system. Summary of the Invention

[0003] This disclosure provides a current protection method, apparatus, electronic device, and storage medium for an electric drive system. The technical solution of this disclosure is as follows:

[0004] The first aspect of this disclosure provides a current protection method for an electric drive system, including:

[0005] Based on the actual operating mode of the electric drive system, determine the target overcurrent protection threshold corresponding to the actual operating mode;

[0006] Based on the target overcurrent protection threshold, the electric drive system is subjected to overcurrent protection control.

[0007] A second aspect of this disclosure provides a current protection device for an electric drive system, comprising:

[0008] The determination module is used to determine the target overcurrent protection threshold corresponding to the actual operating mode of the electric drive system.

[0009] The protection control module is used to perform overcurrent protection control on the electric drive system based on the target overcurrent protection threshold.

[0010] A third aspect of this disclosure provides an electronic device including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the method described above.

[0011] A fourth aspect of this disclosure provides a computer-readable storage medium that, when instructions in the storage medium are executed by a processor, enables the processor to perform the steps of the above-described method.

[0012] The technical solutions provided by the embodiments of this disclosure have at least the following beneficial effects:

[0013] This disclosure discloses a current protection method, apparatus, electronic device, and storage medium for an electric drive system. The method determines a target overcurrent protection threshold corresponding to the actual operating mode of the electric drive system and performs overcurrent protection control on the electric drive system based on the target overcurrent protection threshold. By dynamically adapting the overcurrent protection threshold under different operating modes, this disclosure effectively broadens the current protection range of the electric drive system, enhances the protection capability for key hardware such as motor windings and functional devices, and thus improves the operational reliability and service life of the electric drive system.

[0014] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0015] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this disclosure and, together with the description, serve to explain the principles of this disclosure, and are not intended to unduly limit this disclosure.

[0016] Figure 1 This is a schematic diagram illustrating a scenario application of an electric drive system according to an embodiment of the present disclosure;

[0017] Figure 2 This is a flowchart of a current protection method for an electric drive system according to an embodiment of the present disclosure;

[0018] Figure 3 This is a flowchart of a current protection method for an electric drive system according to another embodiment of the present disclosure;

[0019] Figure 4 This is a schematic diagram of a current protection device for an electric drive system according to an embodiment of the present disclosure;

[0020] Figure 5 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present disclosure. Detailed Implementation

[0021] To enable those skilled in the art to better understand the technical solutions of this disclosure, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings.

[0022] It should be noted that the terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this disclosure described herein can be implemented in orders other than those illustrated or described herein. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims.

[0023] The following description, with reference to the accompanying drawings, outlines a current protection method, apparatus, electronic device, and storage medium for an electric drive system according to embodiments of the present disclosure.

[0024] Figure 1 This is a schematic diagram illustrating the application of an electric drive system according to an embodiment of the present disclosure in a charging scenario.

[0025] like Figure 1 As shown in the embodiments of this disclosure, the charging system includes: a charging pile, a boost converter, an electric drive system, and a battery. In this system architecture, the charging pile serves as an external DC power source, connected to the input terminal of the boost converter via a DC harness. The output terminal of the boost converter is then connected to the input terminal of the electric drive system via a DC harness, and the output terminal of the electric drive system is connected to the battery.

[0026] The booster plays a role in voltage regulation during the charging process. It raises the DC voltage output by the charging pile to the operating voltage range required by the electric drive system and transmits the adjusted electrical energy to the electric drive system.

[0027] The electric drive system includes an inverter and motor windings. The inverter employs a three-phase bridge topology, consisting of... Figure 1 The system consists of power devices (such as power switching elements configured on phases U1, V1, W1, U2, V2, and W2). The motor windings serve as the medium for energy conversion. During charging, the electric drive system controls the inverter's operating state to convert the input electrical energy into DC power that meets the battery's charging requirements, ultimately charging the battery.

[0028] Figure 2 This is a flowchart of a current protection method for an electric drive system according to an embodiment of the present disclosure.

[0029] It should be noted that the current protection method for the electric drive system in this disclosure can be applied to the current protection device for the electric drive system. In some possible embodiments, the current protection device for the electric drive system can be configured in an electronic device so that the electronic device can perform the current protection function of the electric drive system.

[0030] Electronic devices include, but are not limited to, vehicles, servers, and terminals. A terminal is a user-side entity used to receive or transmit signals, such as a mobile phone. Terminals can also be called terminal equipment (UE), user equipment (UE), mobile station (MS), mobile terminal (MT), etc. Terminals can be vehicles with communication capabilities, intelligent vehicles, mobile phones, wearable devices, tablets, computers with wireless transceiver capabilities, virtual reality (VR) terminals, augmented reality (AR) terminals, wireless terminals in industrial control, wireless terminals in self-driving, wireless terminals in remote medical surgery, wireless terminals in smart grids, wireless terminals in transportation safety, wireless terminals in smart cities, wireless terminals in smart homes, and so on.

[0031] like Figure 2 As shown, the current protection method for an electric drive system according to an embodiment of this disclosure includes the following steps:

[0032] S201, determine the target overcurrent protection threshold corresponding to the actual working mode of the electric drive system.

[0033] This disclosure uses the detection of charging gun connection signals and / or on-board charger enable signals to determine the current actual operating mode of the electric drive system. The charging gun connection signal directly reflects whether the vehicle is charging; the on-board charger enable signal further confirms the activation status of charging-related systems. By detecting these two signals, the current actual operating mode of the electric drive system can be accurately determined.

[0034] The electric drive system operates in two modes: charging mode and driving mode. When the signal detection determines that the current operating mode is charging mode, the target overcurrent protection threshold is set to the first set phase current protection threshold. When the signal detection determines that the current operating mode is driving mode, the target overcurrent protection threshold is set to the second set phase current protection threshold. Since the motor's current demand in driving mode is typically higher than in charging mode, the second set phase current protection threshold is greater than the first set phase current protection threshold.

[0035] In this disclosure, a first set phase current protection threshold is determined based on the peak current allowed by each power device in the electric drive system during charging mode. For example, when the electric drive system is in charging mode, the peak current allowed by each power device is acquired, and the minimum current value is selected from the acquired peak currents as the first set phase current protection threshold.

[0036] In this disclosure, a second set phase current protection threshold is determined based on the peak current allowed by each power device in the electric drive system during driving mode. For example, when the electric drive system is in driving mode, the peak current allowed by each power device is acquired, and the minimum current value is selected from the acquired peak currents as the second set phase current protection threshold.

[0037] S202, based on the target overcurrent protection threshold, performs overcurrent protection control on the electric drive system.

[0038] During this step, current signals from the three-phase windings (U, V, and W phases) of the motor are acquired in real time using current sensors. The current sensors must be closely fitted to the output lines of the motor windings to ensure accurate sensing of changes in the current of each phase. For example, a battery sensor can be installed near the connection point between the motor windings and the electric drive system circuitry. This minimizes the impact of external interference on the current signal acquisition, ensuring that the acquired data accurately reflects the actual current conditions of each phase of the motor.

[0039] When the electric drive system is currently in charging mode, the actual current of each phase of the three-phase winding of the motor, collected by the current sensor, is compared with the first set phase current protection threshold determined in step S201. This comparison can be implemented using a comparator circuit. The comparator receives the actual current signal and the first set phase current protection threshold signal in real time and determines whether the actual current is greater than the first set phase current protection threshold. For example, if the actual current of phase U is Iu and the first set phase current protection threshold is OCref, the comparator will determine whether Iu is greater than OCref. The same operation is performed on phases V and W.

[0040] When the electric drive system is currently in driving mode, the actual current of each phase of the three-phase winding of the motor collected by the current sensor is compared with the second set phase current protection threshold determined in step S201. Similarly, a comparator circuit is used to compare the actual current of each phase with the second set phase current protection threshold in real time to determine whether an overcurrent situation has occurred.

[0041] During the above comparison process, regardless of whether it is charging mode or driving mode, as long as the actual current of any phase exceeds the corresponding target overcurrent protection threshold (the first set phase current protection threshold in charging mode and the second set phase current protection threshold in driving mode), an overcurrent event can be determined to have occurred in the electric drive system. At this time, the electric drive system will immediately trigger the overcurrent flag bit and record information such as the time of overcurrent occurrence, the overcurrent phase, and the specific value of the overcurrent current, in order to facilitate subsequent fault analysis.

[0042] Based on a determined overcurrent event, the following overcurrent protection and control measures can be taken for the electric drive system:

[0043] Power Regulation: The motor's output power is immediately adjusted via the electric drive system's controller. In charging mode, the power transmitted from the boost converter to the electric drive system is reduced, decreasing the input current. In driving mode, the motor's drive power is appropriately reduced, causing the current to quickly drop to a safe range. For example, power regulation can be achieved by adjusting the on and off times of the power devices in the inverter, thereby changing the motor's input voltage and current.

[0044] Disconnect power: If the overcurrent situation is severe, disconnect part or all of the power supply. In charging mode, disconnect the charging station from the boost converter (e.g., by turning off...). Figure 1 The switch S1 shown in the diagram stops the charging process; in driving mode, it disconnects the main power circuit between the battery and the electric drive system (e.g., by turning off the switch). Figure 1 The switches K1 and K2 described herein are used to prevent overcurrent from causing irreversible damage to critical components such as motors and inverters.

[0045] Alarm Notice: Simultaneously, an overcurrent alarm signal is sent to the vehicle's central control system, triggering the warning indicator light on the instrument panel to illuminate, possibly accompanied by an audible alert, to remind the driver or relevant personnel to pay attention to any abnormalities in the electric drive system. Maintenance personnel can then use the overcurrent information recorded by the system to conduct a comprehensive inspection and repair of the electric drive system, eliminate potential faults, and ensure the system returns to normal operation.

[0046] Therefore, by setting different overcurrent protection thresholds under different operating modes (such as charging mode and driving drive module), this disclosure enables the electric drive system to achieve more accurate overcurrent detection and protection response under different load conditions, avoiding false protection or leakage protection problems caused by fixed thresholds, thereby broadening the current protection range of the electric drive system, improving the protection capability of key hardware such as motor windings and functional devices, and thus improving the operational reliability and service life of the electric drive system.

[0047] Figure 3 This is a flowchart of a current protection method for an electric drive system according to another embodiment of the present disclosure.

[0048] like Figure 3 As shown in the embodiments of this disclosure, the current protection method for the electric drive system further includes:

[0049] S301, in response to the actual operating mode of the electric drive system being the charging mode, determines the actual charging current based on the actual current of at least one phase of the three-phase winding of the motor in the electric drive system.

[0050] When the electric drive system is currently in charging mode, after collecting the actual phase current of the three-phase winding, the actual phase current of one, two, or three phases is selected for analysis to obtain the actual charging current that can represent the current charging state.

[0051] S302, based on the actual charging current, determine whether a target abnormal event has occurred in the charging pile supplying power to the electric drive system.

[0052] Based on the actual charging current determined in step S302, further judgment is made on whether the charging pile has experienced the target abnormal time.

[0053] The target abnormal events include short-circuit fault events and current output abnormal events.

[0054] During the monitoring of the actual charging current, both its direction and magnitude must be monitored. If the actual charging current is detected to flow from the electric drive system to the charging pile, and the absolute value of the actual charging current is greater than the first set charging current threshold, a short-circuit fault event is determined to have occurred on the charging pile side. The first set charging current threshold is determined jointly based on the first set phase current protection threshold and the set current tolerance. The set current tolerance is a current range value reserved to account for factors such as measurement errors and current fluctuations in the actual system.

[0055] If a short-circuit fault is confirmed at the charging station, short-circuit protection control will be implemented for the electric drive system. Short-circuit protection control measures may include: quickly disconnecting the electrical connection between the electric drive system and the charging station to prevent further damage to the electric drive system from the short-circuit current; simultaneously, sending a short-circuit fault alarm signal to the vehicle's central control system, triggering the instrument panel fault indicator light to illuminate and emitting an audible warning light, so that the driver or maintenance personnel can be promptly informed and take further action.

[0056] Therefore, during the charging process, when a short circuit fault occurs on the charging pile side, causing the actual charging current to flow back from the electric drive system to the charging pile, the system can quickly identify the anomaly by accurately detecting the current direction and comparing it with a first-set charging current threshold. Once backflow is detected and the current exceeds the threshold, the system immediately disconnects the electric drive system from the charging pile to prevent the short circuit current from damaging critical components such as the motor and inverter, ensuring the safety of the electric drive system and extending its service life.

[0057] If, during monitoring of the actual charging current, it is found that the actual charging current exceeds the second set charging current threshold and the duration exceeds the set time, then an abnormal current output event is determined to have occurred at the charging pile. The second set charging current threshold is determined based on the rated operating current of the boost converter, the rated operating current of the electric drive system, and the rated charging current of the battery in the charging system. For example, the minimum value among these three currents can be used as the second set charging current threshold. This second set charging current threshold, determined based on the rated operating currents of the boost converter, the electric drive system, and the battery, effectively determines whether the charging pile is experiencing abnormal current output. The set time is to eliminate brief current fluctuations and ensure that only continuous abnormal currents trigger the judgment of an abnormal current output event.

[0058] Once an abnormal current output event is confirmed at the charging station, the electric drive system must also be protected against this abnormal current output. Measures for this protection may include: reducing the power output obtained by the electric drive system from the charging station by adjusting the power conversion module within the electric drive system to decrease current input; if the abnormality is severe, the charging connection may be disconnected to stop the charging process; simultaneously, an abnormal current output alarm signal should be sent to the vehicle control system to alert relevant personnel for inspection and repair, ensuring the safe operation of both the electric drive system and the charging station.

[0059] Therefore, this disclosure, by comprehensively monitoring the current output at the charging pile end and setting a second set charging current threshold and duration condition, can accurately determine whether there is an abnormal current output in the charging pile. In after-sales scenarios, the responsible party can be identified based on the actual output range of the charging current.

[0060] In summary, the current protection method, apparatus, electronic device, and storage medium for the electric drive system disclosed in this embodiment determine a target overcurrent protection threshold corresponding to the actual operating mode of the electric drive system, and perform overcurrent protection control on the electric drive system based on the target overcurrent protection threshold. By dynamically adapting the overcurrent protection threshold under different operating modes, this disclosure can effectively broaden the current protection range of the electric drive system, improve the protection capability for key hardware such as motor windings and functional devices, and thus improve the operational reliability and service life of the electric drive system.

[0061] Figure 4 This is a schematic diagram of a current protection device for an electric drive system according to an embodiment of the present disclosure.

[0062] like Figure 4 As shown, the current protection device 400 of the electric drive system in this embodiment includes: a determination module 410 and a protection control module 420.

[0063] The determining module 410 is used to determine the target overcurrent protection threshold corresponding to the actual working mode of the electric drive system.

[0064] The protection control module 420 is used to perform overcurrent protection control on the electric drive system based on the target overcurrent protection threshold.

[0065] In one embodiment of this disclosure, the operating modes of the electric drive system include a charging mode and a driving mode, and the determining module 410 includes:

[0066] The mode determination unit 411 is used to output a first selection signal (such as OCrefSelect=1) in response to the actual working mode of the electric drive system being the charging mode, or to output a second selection signal (such as OCrefSelect=0) in response to the actual working mode of the electric drive system being the driving mode.

[0067] The overcurrent threshold setting unit 412 is used to determine the target overcurrent protection threshold OCref as the first set phase current protection threshold according to the first selection signal, or to determine the target overcurrent protection threshold OCref as the second set phase current protection threshold according to the second selection signal.

[0068] The second set phase current protection threshold is greater than the first set phase current protection threshold.

[0069] In one embodiment of this disclosure, the determining module 410 further includes:

[0070] The first determining unit (not shown in the figure) is used to determine the first set phase current protection threshold based on the peak current allowed by each power device in the electric drive system in charging mode.

[0071] In one embodiment of this disclosure, the determining module 410 further includes:

[0072] The second determining unit (not shown in the figure) is used to determine the second set phase current protection threshold based on the peak current allowed by each power device of the electric drive system in driving mode.

[0073] In one embodiment of this disclosure, the protection control module 420 includes:

[0074] Three parallel comparison units, such as U-phase comparison unit 421, V-phase comparison unit 422, and W-phase comparison unit 423, are used to compare the actual current of each phase of the three-phase winding of the motor in the electric drive system with the target overcurrent protection threshold. If the actual current of the corresponding phase is greater than the target overcurrent protection threshold, an overcurrent event is determined to have occurred in the electric drive system, and the overcurrent flag signal of the corresponding phase is output. The overcurrent flag signal of the U phase is OCHwU, the overcurrent flag signal of the V phase is OCHwV, and the overcurrent flag signal of the W phase is OCHwW.

[0075] The fault handling unit 424 is used to perform overcurrent protection control on the electric drive system based on the overcurrent flag signal of any phase.

[0076] In one embodiment of this disclosure, the protection control module 420 further includes:

[0077] The current signal processing unit 425 is used to respond to the actual working mode of the electric drive system being the charging mode, determine the actual charging current based on the actual current of at least one phase of the three-phase winding of the motor in the electric drive system, and determine whether the charging pile supplying power to the electric drive system has experienced a target abnormal event based on the actual charging current.

[0078] In one embodiment of this disclosure, in response to a target abnormal event, including a short-circuit fault event, the current signal processing unit 425 includes:

[0079] The first processing subunit 4251 is used to respond to the detection that the direction of the actual charging current is from the electric drive system to the charging pile, and the absolute value of the actual charging current is greater than the first set charging current threshold, to determine that a short circuit fault has occurred on the charging pile side, and to output a short circuit protection control signal OCSw to the fault processing unit 424.

[0080] The fault handling unit 424 is also used to perform short-circuit protection control on the electric drive system according to the short-circuit protection control signal OCSw.

[0081] In one embodiment of this disclosure, the determining module 410 further includes:

[0082] The third determining unit (not shown in the figure) is used to determine the first set charging current threshold based on the first set phase current protection threshold and the set current tolerance.

[0083] In one embodiment of this disclosure, in response to a target abnormal event, including a current output abnormal event, the current signal processing unit 425 further includes:

[0084] The second processing subunit 4252 is used to determine that an abnormal current output event has occurred on the charging pile side in response to the detection that the actual charging current is greater than the second set charging current threshold and the duration is greater than the set time, and to output a current output abnormal signal to the fault processing unit 424.

[0085] The fault handling unit 424 is also used to perform current output abnormality protection control on the electric drive system based on the current output abnormality signal.

[0086] In one embodiment of this disclosure, the determining module 410 further includes:

[0087] The fourth determining unit (not shown in the figure) is used to determine the second set charging current threshold based on the rated operating current of the boost converter in the charging system, the rated operating current of the electric drive system, and the rated charging current of the battery.

[0088] It should be noted that the foregoing explanation of the current protection method embodiment for the electric drive system also applies to the current protection device of the electric drive system in this embodiment, and will not be repeated here.

[0089] According to the current protection device of the electric drive system in this disclosure, a determining module determines a target overcurrent protection threshold corresponding to the actual operating mode of the electric drive system, and a protection control module performs overcurrent protection control on the electric drive system based on the target overcurrent protection threshold. This disclosure, by dynamically adapting the overcurrent protection threshold to different operating modes, effectively broadens the current protection range of the electric drive system, enhances the protection capability for key hardware such as motor windings and functional devices, and thus improves the operational reliability and service life of the electric drive system.

[0090] To implement the above embodiments, this disclosure also proposes an electronic device, including a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, it implements the steps of the current protection method for the electric drive system as described in any of the foregoing embodiments.

[0091] Figure 5 This is a schematic diagram of the structure of an electronic device according to an embodiment of the present disclosure. For example, the electronic device 500 may be a mobile phone, a computer, a digital broadcasting terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, etc.

[0092] Reference Figure 5 The electronic device 500 may include one or more of the following components: processing component 502, memory 504, power component 506, multimedia component 508, audio component 510, input / output (I / O) interface 512, sensor component 514, and communication component 516.

[0093] Processing component 502 typically controls the overall operation of electronic device 500, such as operations associated with display, telephone calls, data communication, camera operation, and recording operations. Processing component 502 may include one or more processors 520 to execute instructions to complete all or part of the steps of the methods described above. Furthermore, processing component 502 may include one or more modules to facilitate interaction between processing component 502 and other components. For example, processing component 502 may include a multimedia module to facilitate interaction between multimedia component 508 and processing component 502.

[0094] Memory 504 is configured to store various types of data to support the operation of electronic device 500. Examples of such data include instructions for any application or method operating on electronic device 500, contact data, phonebook data, messages, pictures, videos, etc. Memory 504 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as Static Random Access Memory (SRAM), Electrically Erasable Programmable Read-Only Memory (EEPROM), Erasable Programmable Read-Only Memory (EPROM), Programmable Read-Only Memory (PROM), Read-Only Memory (ROM), magnetic storage, flash memory, magnetic disk, or optical disk.

[0095] Power component 506 provides power to the various components of electronic device 500. Power component 506 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to electronic device 500.

[0096] Multimedia component 508 includes a screen that provides an output interface between the electronic device 500 and the user. In some embodiments, the screen may include a Liquid Crystal Display (LCD) and a Touch Panel (TP). If the screen includes a Touch Panel, the screen may be implemented as a touchscreen to receive input signals from the user. The Touch Panel includes one or more touch sensors to sense touches, swipes, and gestures on the Touch Panel. The touch sensors may sense not only the boundaries of the touch or swipe action but also the duration and pressure associated with the touch or swipe operation. In some embodiments, multimedia component 508 includes a front-facing camera and / or a rear-facing camera. When the electronic device 500 is in an operating mode, such as a shooting mode or a video mode, the front-facing camera and / or the rear-facing camera may receive external multimedia data. Each front-facing camera and rear-facing camera may be a fixed optical lens system or have focal length and optical zoom capabilities.

[0097] Audio component 510 is configured to output and / or input audio signals. For example, audio component 510 includes a microphone (MIC) configured to receive external audio signals when electronic device 500 is in an operating mode, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 504 or transmitted via communication component 516. In some embodiments, audio component 510 also includes a speaker for outputting audio signals.

[0098] I / O interface 512 provides an interface between processing component 502 and peripheral interface modules, such as keyboards, click wheels, buttons, etc. These buttons may include, but are not limited to, home buttons, volume buttons, power buttons, and lock buttons.

[0099] Sensor assembly 514 includes one or more sensors for providing state assessments of various aspects of electronic device 500. For example, sensor assembly 514 may detect the on / off state of electronic device 500, the relative positioning of components such as the display and keypad of electronic device 500, changes in position of electronic device 500 or a component of electronic device 500, the presence or absence of user contact with electronic device 500, orientation or acceleration / deceleration of electronic device 500, and temperature changes of electronic device 500. Sensor assembly 514 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 514 may also include an optical sensor, such as a complementary metal-oxide-semiconductor (CMOS) or charge-coupled device (CCD) image sensor, for use in imaging applications. In some embodiments, sensor assembly 514 may also include an accelerometer, gyroscope, magnetometer, pressure sensor, or temperature sensor.

[0100] Communication component 516 is configured to facilitate wired or wireless communication between electronic device 500 and other devices. Electronic device 500 can access wireless networks based on communication standards, such as WiFi (Wireless Fidelity), 4G (Fourth Generation), or 5G (Fifth Generation), or combinations thereof. In one exemplary embodiment, communication component 516 receives broadcast signals or broadcast-related information from an external broadcast management system via a broadcast channel. In one exemplary embodiment, communication component 516 also includes a Near Field Communication (NFC) module to facilitate short-range communication. For example, the NFC module may be based on Radio Frequency Identification (RFID), Infrared Data Association (IrDA), Ultra-Wideband (UWB), Bluetooth, and other technologies.

[0101] In an exemplary embodiment, the electronic device 500 may be implemented by one or more application-specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field-programmable gate arrays (FPGAs), controllers, microcontrollers, microprocessors, or other electronic components to perform the methods described above.

[0102] In an exemplary embodiment, a computer-readable storage medium including instructions is also provided, such as a memory 504 including instructions, which can be executed by a processor 520 of an electronic device 500 to perform the above-described method. For example, the computer-readable storage medium may be a read-only memory (ROM), a random access memory (RAM), a compact disc read-only memory (CD-ROM), magnetic tape, floppy disk, and optical data storage device, etc.

[0103] Based on the above embodiments, this disclosure also proposes a computer-readable storage medium that, when the instructions in the storage medium are executed by a processor, enables the processor to execute the above-described current protection method for an electric drive system.

[0104] Based on the above embodiments, this disclosure also proposes a computer program product, including a computer program that, when executed by a processor, implements the above-described current protection method for an electric drive system.

[0105] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0106] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0107] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of preferred embodiments of this disclosure includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of this disclosure pertain.

[0108] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a ordered list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-including system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and compact disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, because the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0109] It should be understood that various parts of this disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0110] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.

[0111] Furthermore, the functional units in the various embodiments of this disclosure can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.

[0112] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present disclosure.

[0113] Other embodiments of this disclosure will readily occur to those skilled in the art upon consideration of the specification and practice of the invention disclosed herein. This disclosure is intended to cover any variations, uses, or adaptations of this disclosure that follow the general principles of this disclosure and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this disclosure are indicated by the appended claims.

[0114] It should be understood that this disclosure is not limited to the precise structures described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this disclosure is limited only by the appended claims.

Claims

1. A current protection method for an electric drive system, characterized in that, include: Based on the actual operating mode of the electric drive system, determine the target overcurrent protection threshold corresponding to the actual operating mode; Based on the target overcurrent protection threshold, the electric drive system is subjected to overcurrent protection control.

2. The method of claim 1, wherein, The electric drive system operates in two modes: a charging mode and a driving mode. Determining the target overcurrent protection threshold corresponding to the actual operating mode of the electric drive system includes: In response to the actual operating mode of the electric drive system being the charging mode, the target overcurrent protection threshold is determined to be the first set phase current protection threshold; In response to the actual operating mode of the electric drive system being the driving mode, the target overcurrent protection threshold is determined to be the second set phase current protection threshold; Wherein, the second set phase current protection threshold is greater than the first set phase current protection threshold.

3. The method of claim 2, wherein, The method further includes: The first set phase current protection threshold is determined based on the peak current allowed by each power device of the electric drive system in the charging mode.

4. The method of claim 2, wherein, The method further includes: The second set phase current protection threshold is determined based on the peak current allowed by each power device of the electric drive system in the driving mode.

5. The method of claim 1, wherein, The overcurrent protection control of the electric drive system based on the target overcurrent protection threshold includes: The actual current of each phase of the three-phase winding of the motor in the electric drive system is compared with the target overcurrent protection threshold. In response to any phase actual current exceeding the target overcurrent protection threshold, it is determined that an overcurrent event has occurred in the electric drive system; Based on the overcurrent event, overcurrent protection control is performed on the electric drive system.

6. The method of claim 1, wherein, The method further includes: In response to the fact that the electric drive system is in the actual operating mode of charging mode, the actual charging current is determined based on the actual current of at least one phase of the three-phase winding of the motor in the electric drive system. Based on the actual charging current, determine whether a target abnormal event has occurred in the charging pile supplying power to the electric drive system.

7. The method of claim 6, wherein, In response to the target abnormal event including a short-circuit fault event, determining whether a target abnormal event has occurred in the charging pile supplying power to the electric drive system based on the actual charging current includes: In response to detecting that the direction of the actual charging current is from the electric drive system to the charging pile, and that the absolute value of the actual charging current is greater than a first set charging current threshold, it is determined that the short circuit fault event has occurred on the charging pile side. The method further includes: Based on the short-circuit fault event, short-circuit protection control is performed on the electric drive system.

8. The method according to claim 7, characterized in that, The method further includes: The first set charging current threshold is determined based on the first set phase current protection threshold and the set current tolerance.

9. The method according to claim 6, characterized in that, In response to the target abnormal event, including a current output abnormal event, determining whether the charging pile supplying power to the electric drive system has experienced a target abnormal event based on the actual charging current includes: In response to detecting that the actual charging current is greater than a second set charging current threshold and the duration is greater than a set time, it is determined that an abnormal current output event has occurred on the charging pile side; The method further includes: Based on the abnormal current output event, the electric drive system is subjected to abnormal current output protection control.

10. The method according to claim 9, characterized in that, The method further includes: The second set charging current threshold is determined based on the rated operating current of the boost converter in the charging system, the rated operating current of the electric drive system, and the rated charging current of the battery.

11. A current protection device for an electric drive system, characterized in that, include: The determination module is used to determine the target overcurrent protection threshold corresponding to the actual operating mode of the electric drive system. The protection control module is used to perform overcurrent protection control on the electric drive system based on the target overcurrent protection threshold.

12. The apparatus according to claim 11, characterized in that, The electric drive system has two operating modes: a charging mode and a driving mode. The determining module includes: The mode determination unit is used to output a first selection signal in response to the actual working mode of the electric drive system being the charging mode, or to output a second selection signal in response to the actual working mode of the electric drive system being the driving mode. The overcurrent threshold setting unit is used to determine the target overcurrent protection threshold as a first set phase current protection threshold according to the first selection signal, or to determine the target overcurrent protection threshold as a second set phase current protection threshold according to the second selection signal. Wherein, the second set phase current protection threshold is greater than the first set phase current protection threshold.

13. The apparatus according to claim 12, characterized in that, The determining module further includes: The first determining unit is used to determine a first set phase current protection threshold based on the peak current allowed by each power device of the electric drive system in the charging mode.

14. The apparatus according to claim 12, characterized in that, The determining module further includes: The second determining unit is used to determine the second set phase current protection threshold based on the peak current allowed by each power device in the electric drive system in the driving mode.

15. The apparatus according to claim 11, characterized in that, The protection control module includes: Three parallel comparison units are used to compare the actual current of each phase of the three-phase winding of the motor in the electric drive system with the target overcurrent protection threshold. If the actual current of the corresponding phase is greater than the target overcurrent protection threshold, it is determined that an overcurrent event has occurred in the electric drive system, and the overcurrent flag signal of the corresponding phase is output. The fault handling unit is used to perform overcurrent protection control on the electric drive system based on the overcurrent flag signal of any phase.

16. The apparatus according to claim 11, characterized in that, The protection control module further includes: The current signal processing unit is used to determine the actual charging current based on the actual current of at least one phase of the three-phase winding of the motor in the electric drive system in response to the actual operating mode of the electric drive system being the charging mode, and to determine whether the charging pile supplying power to the electric drive system has experienced a target abnormal event based on the actual charging current.

17. The apparatus according to claim 16, characterized in that, In response to the target abnormal event, including a short-circuit fault event, the current signal processing unit includes: The first processing subunit is configured to, in response to detecting that the direction of the actual charging current is from the electric drive system to the charging pile, and that the absolute value of the actual charging current is greater than a first set charging current threshold, determine that a short circuit fault has occurred on the charging pile side, and output a short circuit protection control signal to the fault handling unit. The fault handling unit is also used to perform short-circuit protection control on the electric drive system according to the short-circuit protection control signal.

18. The apparatus according to claim 17, characterized in that, The determining module further includes: The third determining unit is used to determine the first set charging current threshold based on the first set phase current protection threshold and the set current tolerance.

19. The apparatus according to claim 18, characterized in that, In response to the target abnormal event, including a current output abnormal event, the current signal processing unit further includes: The second processing subunit is used to determine that an abnormal current output event has occurred on the charging pile side in response to detecting that the actual charging current is greater than the second set charging current threshold and the duration is greater than the set time, and to output a current output abnormal signal to the fault handling unit. The fault handling unit is also used to perform current output abnormality protection control on the electric drive system based on the current output abnormality signal.

20. The apparatus according to claim 19, characterized in that, The determining module further includes: The fourth determining unit is used to determine the second set charging current threshold based on the rated operating current of the boost converter in the charging system, the rated operating current of the electric drive system, and the rated charging current of the battery.

21. An electronic device, characterized in that, It includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the program, it implements the steps of the method as described in any one of claims 1-10.

22. A computer-readable storage medium, wherein instructions in the storage medium, when executed by a processor, enable the processor to perform the steps of the method as claimed in any one of claims 1-10.

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