A method, device and terminal equipment for monitoring the safety of a range extender

Abstract

The application provides a range extender operation safety monitoring method and device and terminal equipment, which are suitable for the technical field of new energy vehicles. The method comprises the following steps: obtaining operation parameters, operation parameter duration and operation mode information of a range extender; calculating an operation parameter threshold value according to the operation parameters based on the operation mode information; and obtaining safety monitoring information of the range extender according to the operation mode information, operation parameters, operation parameter duration, operation parameter threshold value, preset target parameters and preset duration threshold value. The application performs real-time monitoring on the operation parameters and operation parameter duration of the range extender, and makes a fault prediction on the range extender in different operation states according to the change of the operation parameters and the operation parameter duration. Therefore, measures can be taken in advance for possible faults of the range extender before the faults occur, so that the safety and reliability of the range extender during operation are improved.

Description

Technical Field

[0001] This application belongs to the field of new energy vehicle technology, and in particular relates to methods, devices and terminal equipment for monitoring the operational safety of range extenders. Background Technology

[0002] Range-extended electric vehicles (REEVs), as an important branch of plug-in hybrid technology, have become a highlight of the new energy vehicle development, exhibiting outstanding growth among new energy vehicle sub-categories and a steadily increasing market share. The range extender is the core power supply component of a REEV. It consists of an engine and an electric motor, with the engine coupled to drive the motor and generate electricity to power the vehicle. When the battery charge is insufficient, the range extender can provide additional power to the battery pack, thereby extending the electric vehicle's driving range. However, as a complex power system composed of an engine and an electric motor, the complex mechanical, electrical, and fluid coupling relationships mean that when a range extender malfunctions, it usually results in one of the different components failing, significantly reducing reliability and posing potential safety hazards. The most common consequence of a range extender malfunction is runaway, which occurs when the range extender's speed far exceeds its rated maximum speed, causing severe engine vibration, a roaring sound, and a large amount of black or blue smoke from the exhaust pipe. Furthermore, the high voltage generated by the electric motor during a runaway event can easily damage vehicle parts and endanger personal safety. Therefore, it is essential to address any malfunctions caused by the range extender promptly.

[0003] In the existing technology, the method for judging and handling the fault of the range extender is usually to set a fixed maximum speed threshold, and then compare the actual speed of the range extender with the fixed maximum speed threshold. When the actual speed is greater than the fixed maximum speed threshold, it is determined that the range extender has a fault, and then the oil and power are cut off to the range extender.

[0004] However, in the existing technology, judging whether the range extender has failed is based solely on a fixed maximum speed threshold. This only sets one type of failure and cannot promptly determine the failure of the range extender under different operating conditions and take appropriate fault handling measures. This results in a lack of timeliness and flexibility in fault handling, and cannot ensure the performance of automotive parts and the personal safety of vehicle users. Summary of the Invention

[0005] In view of this, embodiments of this application provide a method, apparatus and terminal equipment for monitoring the safe operation of a range extender, which can determine the fault of a range extender in different operating states, so as to take timely measures to deal with possible faults of the range extender before the fault occurs.

[0006] The first aspect of this application provides a method for monitoring the operational safety of a range extender, including:

[0007] Obtain the operating parameters, duration of operating parameters, and operating mode information of the range extender;

[0008] Based on the operating mode information, calculate the operating parameter threshold according to the operating parameters;

[0009] Based on the operating mode information, operating parameters, operating parameter duration, operating parameter threshold, preset target parameters, and preset duration threshold, the safety monitoring information of the range extender is obtained.

[0010] A second aspect of this application provides a range extender operation safety monitoring device, comprising:

[0011] The information acquisition module is used to acquire the operating parameters, operating parameter durations, and operating mode information of the range extender.

[0012] The operation parameter threshold calculation module is used to calculate the operation parameter threshold based on the operation mode information and the operation parameters; and

[0013] The safety monitoring information generation module is used to obtain the safety monitoring information of the range extender based on the operating mode information, operating parameters, operating parameter duration, operating parameter threshold, preset target parameters, and preset duration threshold.

[0014] A third aspect of this application provides a terminal device, the terminal device including a memory and a processor, the memory storing a computer program executable on the processor, the processor executing the computer program to implement the steps of the range extender operation safety monitoring method as described in any of the first aspects above.

[0015] A fourth aspect of this application provides a computer-readable storage medium, comprising: storing a computer program, characterized in that, when the computer program is executed by a processor, it implements the steps of the range extender operation safety monitoring method as described in any of the first aspects above.

[0016] The beneficial effects of this application embodiment compared with the prior art are: by real-time monitoring of the operating parameters and duration of the range extender, and by predicting the faults of the range extender in different operating states based on the changes in the operating parameters and the duration of the operating parameters, measures can be taken in advance to address potential faults of the range extender before they occur, thereby avoiding damage to vehicle parts and endangering personal safety due to range extender failure, and improving the safety and reliability of range-extended vehicles during operation. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram illustrating the implementation process of the range extender operation safety monitoring method provided in the embodiments of this application;

[0019] Figure 2 This is a schematic diagram illustrating the implementation process of the range extender operation safety monitoring method provided in the embodiments of this application;

[0020] Figure 3 This is a schematic diagram illustrating the implementation process of the range extender operation safety monitoring method provided in the embodiments of this application;

[0021] Figure 4 This is a schematic diagram illustrating the implementation process of the range extender operation safety monitoring method provided in the embodiments of this application;

[0022] Figure 5 This is a schematic diagram illustrating the implementation process of the range extender operation safety monitoring method provided in the embodiments of this application;

[0023] Figure 6 This is a schematic diagram of the structure of the range extender operation safety monitoring device provided in the embodiments of this application;

[0024] Figure 7 This is a schematic diagram of the terminal device provided in the embodiments of this application. Detailed Implementation

[0025] In the following description, specific details such as particular system architectures and techniques are set forth for illustrative purposes and not for limitation, in order to provide a thorough understanding of the embodiments of this application. However, those skilled in the art will understand that this application may also be implemented in other embodiments without these specific details. In other instances, detailed descriptions of well-known systems, apparatuses, circuits, and methods have been omitted so as not to obscure the description of this application with unnecessary detail.

[0026] To illustrate the technical solution described in this application, specific embodiments are provided below.

[0027] Figure 1 A flowchart illustrating the implementation of the range extender operation safety monitoring method provided in Embodiment 1 of this application is shown, and is described in detail below:

[0028] Step S101: Obtain the operating parameters, duration of operating parameters, and operating mode information of the range extender.

[0029] In this embodiment, the range extender includes a motor and an engine. The motor can be an ISG motor. The operating parameters of the range extender can be rotational speed, torque, or a combination of motor and engine power. The duration of these operating parameters can be a certain duration of rotational speed, torque, motor power, and engine power. The range extender's operating mode information typically includes three types: start-up mode, generator mode, and shutdown mode. Start-up mode refers to the motor speed initially increasing; once the motor speed reaches a certain value, the engine is simultaneously controlled for fuel injection, ignition, and starting, enabling both the motor and engine to start simultaneously and begin generating electricity. Generator mode refers to controlling the motor speed and engine torque after successful start-up, allowing the motor and engine to work together to generate different amounts of electrical energy. Shutdown mode refers to gradually reducing the motor speed and engine torque until the motor stops rotating, thus shutting down the range extender's operating mode.

[0030] Step S102: Based on the operating mode information, calculate the operating parameter threshold according to the operating parameters.

[0031] In this embodiment, the operating parameter threshold can be the difference threshold between the current operating parameter and the maximum or minimum value of the operating parameter set by the user, or it can be the maximum and minimum values ​​of the operating parameter. It can be obtained by multiplying the current operating parameter by a user-set coefficient. This coefficient can be different in different operating modes.

[0032] In this embodiment, optionally, when the operating mode is power generation mode and the speed is 3000 r / min, the operating parameter threshold can be the difference threshold between the current speed and the maximum speed set by the user. The minimum value of the speed difference can be 3000 multiplied by 5%, which is 150 r / min, and the maximum value of the speed difference can be 3000 multiplied by 20%, which is 600 r / min.

[0033] Step S103: Based on the operating mode information, operating parameters, operating parameter duration, operating parameter threshold, preset target parameters, and preset duration threshold, obtain the safety monitoring information of the range extender.

[0034] In this embodiment, the current operating parameters and duration of the range extender can be monitored in real time according to different operating modes. The current operating parameters are compared with manually set target parameters or calculated operating parameter thresholds to determine if they are within a reasonable range. The duration of the current operating parameter is compared with a manually set duration threshold to determine whether the current operating parameter is abnormal or fluctuating due to sensor issues. When an abnormality is determined by the operating parameter threshold, only if the duration of the current operating parameter is not less than the preset duration threshold can it be concluded that the fluctuation in the current operating parameter value is not due to sensor measurement fluctuations, thus confirming an abnormality. The safety monitoring information of the range extender can be an abnormality indication or fault indication information for a specific operating parameter of the range extender, indicating which operating parameter of the range extender is abnormal or about to cause a fault.

[0035] The range extender operation safety monitoring method provided in this application monitors the range extender's operating parameters and their duration in real time. It also predicts faults in range extenders under different operating states based on changes in operating parameters and their duration. Therefore, it can take timely measures to address potential faults in the range extender before they occur, thereby avoiding abnormal operation caused by unstable range extender control or damage to vehicle parts and personal safety due to range extender failure. This improves the safety and reliability of range-extended vehicles during operation.

[0036] One embodiment of this application provides a range extender operation safety monitoring method that differs from the first embodiment described above in that the operation mode information includes a start-up mode, a power generation mode, and a shutdown mode.

[0037] In this embodiment, the range extender's operating mode information typically includes three modes: start-up mode, generator mode, and shutdown mode. Start-up mode refers to the motor speed initially increasing; once the motor speed reaches a certain value, the engine's fuel injection, ignition, and start are simultaneously controlled to achieve simultaneous start-up and generator generation of both the motor and engine. Generator mode refers to controlling the motor speed and engine torque after successful start-up, allowing the motor and engine to work together to generate different amounts of electrical energy. Shutdown mode refers to gradually reducing the motor speed and engine torque until the motor stops rotating, thus shutting down the range extender's operation. Each operating mode can be manually set through the backend control system.

[0038] Figure 2The flowchart illustrating the implementation of the range extender operation safety monitoring method provided in Embodiment 2 of this application is shown. The difference between this method and Embodiment 1 described above is that:

[0039] The operating parameters include the actual rotational speed;

[0040] The operating parameter thresholds include a speed difference threshold; the speed difference thresholds include a first speed difference threshold, a second speed difference threshold, a third speed difference threshold, and a fourth speed difference threshold, wherein the first speed difference threshold is less than the second speed difference threshold, and the third speed difference threshold is less than the fourth speed difference threshold;

[0041] The target parameters include the target starting speed and the target power generation speed;

[0042] The duration of the operating parameters includes the duration of the actual speed difference;

[0043] The duration threshold includes the actual speed difference duration threshold;

[0044] The safety monitoring information includes abnormal speed information and speed fault information;

[0045] Step S103 specifically includes:

[0046] Step S201: Determine whether the running mode information is the startup mode. If yes, proceed to step S202; otherwise, proceed to step S208.

[0047] In this embodiment, when the range extender is in startup mode, its rotational speed needs to be monitored in real time. The current rotational speed is compared with the target startup speed to determine if the range extender can start. The range extender can only start if its rotational speed is greater than the target startup speed after power-on. The target startup speed is determined by hardware properties and can be measured experimentally.

[0048] Step S202: Calculate the difference between the actual rotational speed and the target starting rotational speed to obtain the first rotational speed difference.

[0049] In this embodiment, when the actual rotational speed is greater than the target starting speed, it indicates that the range extender is ready to start. At this point, it is necessary to determine whether the actual rotational speed of the range extender is too high. Both excessively high and excessively low actual rotational speeds indicate a system malfunction. By subtracting the target starting speed from the actual speed, a first speed difference value is obtained. This first speed difference value is then compared with a manually set first speed difference threshold to determine whether the current speed is too high or fluctuating outside a reasonable range. When the actual speed is too high or fluctuates outside a reasonable range, timely measures must be taken to investigate the cause and prevent system damage.

[0050] Step S203: Determine whether the first speed difference is greater than the first speed difference threshold. If yes, proceed to step S204; otherwise, determine the safety monitoring information as normal speed information.

[0051] In this embodiment, the first speed difference threshold can be manually set, obtained by multiplying the actual speed by a manually set coefficient, or it can be determined by the hardware attributes of the range extender and measured through manual experimentation. When the first speed difference is greater than the first speed difference threshold, it indicates that the current speed of the range extender is too high or too low. If it is too high, countermeasures need to be taken to reduce the speed of the range extender or to stop it, thereby preventing the speed of the range extender from increasing further. If it is too low, countermeasures need to be taken to reduce the speed of the range extender or to stop it, and the cause should be investigated in a timely manner. When the first speed difference is less than the first speed difference threshold, it indicates that the speed control of the current range extender is stable, and no countermeasures are required.

[0052] Step S204: Determine whether the first speed difference is less than the second speed difference threshold. If yes, proceed to step S206; otherwise, proceed to step S205.

[0053] In this embodiment, the second speed difference threshold can be manually set, obtained by multiplying the actual speed by a manually set coefficient, or it can be determined by the hardware attributes of the range extender and measured through manual experimentation. When the first speed difference is greater than the first speed difference threshold and less than the second speed difference threshold, it indicates that the current speed fluctuation of the range extender is too high, the control is unstable, and there is a risk of runaway. However, there is still some time before runaway occurs. At this time, countermeasures need to be taken to reduce the speed of the range extender to prevent the speed of the range extender from continuing to rise, thereby avoiding damage to the components inside the car caused by the high voltage generated by the motor. When the first speed difference is greater than the first speed difference threshold and greater than the second speed difference threshold, it indicates that the current speed of the range extender is already far higher than the normal speed, and runaway is likely to occur at the next moment, or it may have already occurred. When it is determined that runaway is about to occur or has already occurred, emergency measures should be taken to stop the range extender from working to avoid damage to the components inside the car.

[0054] Step S205: Determine whether the duration of the actual speed difference is greater than the threshold value of the actual speed difference. If yes, proceed to step S207; otherwise, determine the safety monitoring information as speed abnormality information.

[0055] In this embodiment, the actual speed difference duration threshold can be manually set, which can be determined based on experimental data after hardware testing. When the actual speed difference duration is greater than the actual speed difference duration threshold, it indicates that the current actual speed has far exceeded the normal speed range, and emergency measures should be taken to shut down the range extender immediately. Otherwise, excessive speed of the range extender and excessive power generation by the motor may damage various components in the vehicle. When the actual speed difference duration is less than the actual speed difference duration threshold, it indicates that the current actual speed exceeding the normal speed range is most likely a normal fluctuation in speed or a normal jump in the measurement value of the measuring sensor. It does not indicate that the range extender has malfunctioned or is about to malfunction, and no emergency measures need to be taken for the range extender.

[0056] Step S206: Determine whether the duration of the actual speed difference is greater than the threshold value of the actual speed difference. If yes, then the safety monitoring information is determined to be speed abnormal information; if no, then the safety monitoring information is determined to be speed normal information.

[0057] In this embodiment, abnormal speed information refers to the range extender's speed deviating from the normal range, but there is still some time before a runaway event occurs. In this case, it is only necessary to reduce the range extender's speed without completely shutting it down. The normal speed range is obtained through experimental measurements of the range extender's hardware by the operator.

[0058] Step S207: The safety monitoring information is determined to be speed fault information.

[0059] In this embodiment, the speed fault information refers to the range extender's speed being far from the normal speed range, indicating that a runaway situation is about to occur or has already occurred. At this time, it is necessary to quickly reduce the speed of the range extender and completely shut down the range extender to avoid damage to the vehicle's internal components caused by the high voltage resulting from the runaway situation.

[0060] Step S208: Calculate the difference between the actual rotational speed and the target rotational speed of power generation to obtain the second rotational speed difference.

[0061] In this embodiment, when the range extender is in generator mode or shutdown mode, it indicates that the range extender has successfully generated electricity. At this time, it is necessary to determine whether the actual speed of the range extender fluctuates too much, and whether it may become uncontrollable, causing the range extender to rotate too fast and damage the vehicle's internal components due to high pressure. By subtracting the actual speed from the generator target speed, a second speed difference value is obtained. This second speed difference value is then compared with a manually set second speed difference threshold to determine whether the current speed fluctuates too much and whether there is any instability in control. When the actual speed is too high, measures must be taken to prevent the range extender speed from increasing further. Specifically, when the actual speed reaches the generator target speed, the range extender begins constant power generation. The generator target speed is determined by hardware attributes and can be measured through manual experiments.

[0062] Step S209: Determine whether the second speed difference is greater than the third speed difference threshold. If yes, proceed to step S210; otherwise, determine the safety monitoring information as normal speed information.

[0063] In this embodiment, the second speed difference threshold can be manually set, obtained by multiplying the actual speed by a manually set coefficient, or it can be determined by the hardware attributes of the range extender and measured through manual experimentation. When the second speed difference is greater than the third speed difference threshold, it indicates that the current speed of the range extender is too high or too low. If it is too high, countermeasures should be taken to reduce the speed of the range extender or to stop it, so as to prevent the speed of the range extender from increasing further. If it is too low, countermeasures should be taken to reduce the speed of the range extender or to stop it, and the cause should be investigated in a timely manner. When the second speed difference is less than the third speed difference threshold, it indicates that the speed control of the current range extender is stable, and no measures are required.

[0064] Step S210: Determine whether the second speed difference is less than the fourth speed difference threshold. If yes, proceed to step S212; otherwise, proceed to step S211.

[0065] In this embodiment, the third and fourth speed difference thresholds can be manually set, obtained by multiplying the actual speed by a manually set coefficient, or determined by the hardware attributes of the range extender and measured through manual experiments. When the second speed difference is greater than the third speed difference threshold but less than the fourth speed difference threshold, it indicates that the current speed fluctuation of the range extender is too high, which is prone to runaway. However, there is still some time before runaway occurs. At this time, countermeasures need to be taken to reduce the speed of the range extender to prevent the speed of the range extender from continuing to rise, thereby avoiding damage to the components inside the car caused by the high voltage generated by the motor. When the second speed difference is greater than the fourth speed difference threshold, it indicates that the current speed of the range extender is already far higher than the normal speed, and runaway is likely to occur at the next moment, or it may have already occurred. When it is determined that runaway is about to occur or has already occurred, emergency measures should be taken to stop the range extender from working to avoid damage to the components inside the car.

[0066] Step S211: Determine whether the duration of the actual speed difference is greater than the threshold value of the actual speed difference. If yes, proceed to step S213; otherwise, determine the safety monitoring information as speed abnormality information.

[0067] In this embodiment, the actual speed difference duration threshold can be manually set, which can be determined based on experimental data after hardware testing. When the actual speed difference duration is greater than the actual speed difference duration threshold, it indicates that the current actual speed has far exceeded the normal speed range, and emergency measures should be taken to shut down the range extender immediately. Otherwise, excessive speed of the range extender and excessive power generation by the motor may damage various components in the vehicle. When the actual speed difference duration is less than the actual speed difference duration threshold, it indicates that the current actual speed exceeding the normal speed range is most likely a normal fluctuation in speed or a normal jump in the measurement value of the measuring sensor. It does not indicate that the range extender has malfunctioned or is about to malfunction, and no emergency measures need to be taken for the range extender.

[0068] Step S212: Determine whether the safety monitoring information is abnormal speed information. If yes, then the safety monitoring information is determined to be abnormal speed information; otherwise, then the safety monitoring information is determined to be normal speed information.

[0069] In this embodiment, abnormal speed information refers to the range extender's speed deviating from the normal range, but there is still some time before a runaway event occurs. In this case, it is only necessary to reduce the range extender's speed without completely shutting it down. The normal speed range is obtained through experimental measurements of the range extender's hardware by the operator.

[0070] Step S213: The safety monitoring information is determined to be speed fault information.

[0071] In this embodiment, the speed fault information refers to the range extender's speed being far from the normal speed range, indicating that a runaway situation is about to occur or has already occurred. At this time, it is necessary to quickly reduce the speed of the range extender and completely shut down the range extender to avoid damage to the vehicle's internal components caused by the high voltage resulting from the runaway situation.

[0072] The range extender operation safety monitoring method provided in this application improves the accuracy of monitoring abnormal speed by real-time monitoring the range extender's rotational speed. When the range extender is in start-up mode, it determines whether the actual rotational speed is above the normal range if the range extender starts normally and is above the target rotational speed. It also determines whether the rotational speed exceeding the normal range is a normal fluctuation or a normal fluctuation in sensor readings, thereby improving the accuracy of monitoring abnormal speed conditions and facilitating timely measures to prevent range extender control instability. When the range extender is in generator or shutdown mode, it determines whether the actual rotational speed is above the normal range if the range extender is generating electricity normally and is above the target rotational speed. It also determines whether the rotational speed exceeding the normal range is a normal fluctuation or a normal fluctuation in sensor readings, thereby improving the accuracy of diagnosing range extender faults. This allows for timely emergency measures to be taken before the range extender is about to overrun, preventing damage to vehicle components caused by overrunning.

[0073] Figure 3 The flowchart illustrating the implementation of the range extender operation safety monitoring method provided in Embodiment 3 of this application is shown. The difference between this method and Embodiment 2 is that, after step S103, the method further includes:

[0074] Step S301: Determine whether the safety monitoring information is abnormal speed information. If yes, proceed to step S302; otherwise, proceed to step S303.

[0075] In this embodiment, the abnormal speed information is used to indicate that the current speed of the range extender has exceeded the normal speed, but has not deviated by much. At this time, it is only necessary to reduce the speed of the range extender to avoid the runaway situation.

[0076] Step S302: Stop the range extender.

[0077] In this embodiment, the current speed of the range extender has exceeded the normal speed, but not by much. At this time, it is only necessary to reduce the speed of the range extender or stop it to avoid the runaway situation, without having to completely shut down the range extender.

[0078] Step S303: Determine whether the safety monitoring information is a speed fault information. If yes, cut off the fuel supply to the range extender's engine. If no, do not reduce the speed of the range extender's motor, and do not cut off the fuel supply or power to the range extender.

[0079] In this embodiment, when the safety monitoring information does not display abnormal speed information, it could be either speed fault information or normal speed information. Speed ​​fault information indicates that the current range extender speed has far exceeded the normal speed range, and even if overspeeding has not yet occurred, it is imminent. Therefore, emergency measures need to be taken for the range extender, namely, requesting a shutdown of the range extender and controlling the engine to cut off fuel and power while simultaneously cutting off power to the electric motor. This aims to completely shut down the range extender while reducing its speed; otherwise, the sudden high-voltage electricity generated by the range extender will damage internal vehicle components. Normal speed information indicates that the current range extender speed is within the normal speed range, and no measures to reduce the speed or shut down the range extender are required.

[0080] Step S304: Determine whether the speed of the range extender motor has decreased. If yes, do not power off the range extender motor until the range extender stops. If no, power off the range extender motor until the range extender stops.

[0081] In this embodiment, when the range extender's speed is significantly higher than the normal range, it indicates that the range extender may be about to overspeed. Therefore, emergency measures are needed, namely, cutting off the fuel supply to the range extender's engine. If the motor speed begins to decrease continuously after fuel cutoff, no further action is required; simply wait for the range extender's speed to decrease to the normal range. However, if the motor speed does not decrease after fuel cutoff, the motor needs to be powered off immediately to prevent further power input to the range extender's motor, thus allowing the range extender's motor speed to continuously decrease to the normal range.

[0082] In this embodiment, when the range extender experiences abnormal speed in start-up mode, it indicates abnormal speed fluctuations, suggesting unstable control of the range extender. Measures to be taken could include reducing the motor speed to shutdown, investigating the cause, and preventing further system damage and excessively high or low speeds. When the range extender experiences a speed fault in start-up mode, it indicates loss of control during startup. Measures to be taken could include cutting off low-voltage power to the motor, investigating the cause, and preventing runaway at excessively high speeds and stalling at excessively low speeds. When the range extender experiences abnormal speed in generator mode, it indicates abnormal fluctuations during generator operation. Measures to be taken could include reducing engine torque and motor speed, investigating the cause, and preventing further system damage and excessively high or low speeds. When the range extender experiences a speed fault in generator mode, it indicates loss of control during operation. Measures to be taken could include cutting off fuel and low-voltage power to the engine and generator, investigating the cause, and preventing runaway and unexpected shutdowns. When the range extender experiences abnormal speed in shutdown mode, it indicates abnormal fluctuations in the range extender's shutdown operation. The necessary measures include disconnecting the low-voltage power to the engine, investigating the cause, and preventing further system damage and runaway due to excessive speed. Similarly, when the range extender experiences speed faults in shutdown mode, the necessary measures include disconnecting the low-voltage power to the motor, investigating the cause, and preventing further system damage and runaway due to excessive speed.

[0083] The range extender operation safety monitoring method provided in this application indicates whether the range extender is in an abnormal state based on safety monitoring information. Different measures are taken for the range extender according to different safety monitoring information to prevent runaway, stalling, and abnormal engine torque output, thereby ensuring that various parts of the vehicle are not damaged due to abnormal speed or torque. When the range extender's speed is far above the normal speed range, and the speed does not decrease after fuel cut-off measures are taken, power is cut off to the range extender's motor and engine, forcibly disconnecting the power source of the range extender's engine. This causes the range extender's motor speed to gradually decrease to the normal speed range, effectively preventing high voltage damage to various vehicle parts caused by excessively high range extender speed.

[0084] Figure 4 The flowchart illustrating the implementation of the range extender operation safety monitoring method provided in Embodiment 4 of this application is shown. The difference between this method and Embodiment 1 described above is that:

[0085] The operating parameters also include actual torque;

[0086] The operating parameter thresholds also include torque difference thresholds; the torque difference thresholds include a first torque difference threshold, a second torque difference threshold, a third torque difference threshold, and a fourth torque difference threshold, wherein the first torque difference threshold is less than the second torque difference threshold, and the third torque difference threshold is less than the fourth torque difference threshold;

[0087] The target parameters also include the target torque for starting and the target torque for power generation;

[0088] The duration of the operating parameters also includes the duration of the actual torque difference;

[0089] The duration threshold also includes the actual torque difference duration threshold;

[0090] The safety monitoring information also includes torque anomaly information and torque fault information;

[0091] Step S103 specifically includes:

[0092] Step S401: Determine whether the running mode information is the startup mode. If yes, proceed to step S402; otherwise, proceed to step S408.

[0093] In this embodiment, when the range extender is in start-up mode, its torque needs to be monitored in real time. By comparing the current torque of the range extender with the target start-up torque, it is determined whether the range extender can start normally. Only when the actual torque after power-on is greater than the target start-up torque can the range extender prepare to start. The target start-up torque is determined by hardware properties and can be measured by manually testing the range extender.

[0094] Step S402: Calculate the difference between the actual torque and the starting target torque to obtain the first torque difference.

[0095] In this embodiment, when the actual torque exceeds the target starting torque, it indicates that the range extender has successfully started. At this point, it is necessary to determine whether the actual torque fluctuation of the range extender is too high. Excessive actual torque will cause the motor to generate more power, potentially leading to overcharging of the vehicle battery pack. A first torque difference is obtained by subtracting the actual torque from the target starting torque. This first torque difference is then compared to a manually set first torque difference threshold to determine if the current torque is too high. If the actual torque is too high, measures must be taken to prevent system damage.

[0096] Step S403: Determine whether the first torque difference is greater than the first torque difference threshold. If yes, proceed to step S404; otherwise, determine the safety monitoring information as normal torque information.

[0097] In this embodiment, the first torque difference threshold can be manually set, obtained by multiplying the actual torque by a manually set coefficient, or it can be determined by the hardware attributes of the range extender and measured through manual experimentation. When the first torque difference is greater than the first torque difference threshold, it indicates that the current torque of the range extender is too high, and countermeasures need to be taken to reduce the torque of the range extender, thereby avoiding damage to other components in the vehicle caused by the engine driving the motor to generate excessive high voltage. When the first torque difference is less than the first torque difference threshold, it indicates that the current torque of the range extender is not too high, and no measures need to be taken to reduce the speed and torque of the range extender.

[0098] Step S404: Determine whether the first torque difference is less than the second torque difference threshold. If yes, proceed to step S406; otherwise, proceed to step S405.

[0099] In this embodiment, the second torque threshold can be manually set, obtained by multiplying the actual torque by a manually set coefficient, or determined by the hardware attributes of the range extender and measured through manual experimentation. When the first torque difference is greater than the first torque difference threshold and less than the second torque difference threshold, it indicates that the current speed of the range extender is too high, posing a risk of runaway. However, there is still some time before runaway occurs. At this time, countermeasures need to be taken to reduce the torque of the range extender to prevent the torque from continuing to rise, thereby preventing the high voltage generated by the engine driving the motor from damaging the components inside the vehicle. When the first torque difference is greater than the first torque difference threshold and greater than the second torque difference threshold, it indicates that the current torque of the range extender is far higher than the normal torque, and runaway is likely to occur at the next moment, or it may have already occurred. When it is determined that runaway is about to occur or has already occurred, emergency measures should be taken for the range extender to stop the engine of the range extender to prevent damage to the components inside the vehicle.

[0100] Step S405: Determine whether the duration of the actual torque difference is greater than the threshold value of the actual torque difference. If yes, proceed to step S407; otherwise, determine the safety monitoring information as torque abnormality information.

[0101] In this embodiment, the actual torque difference duration threshold can be manually set, which can be determined based on experimental data after hardware testing. When the actual torque difference duration exceeds the threshold, it indicates that the current actual torque has far exceeded the normal torque range, and emergency measures should be taken to shut down the range extender immediately. Otherwise, excessive torque from the range extender and excessive power generation from the motor may damage various components in the vehicle. When the actual torque difference duration is less than the threshold, it indicates that the current actual torque exceeds the normal torque range, which is likely a normal fluctuation in torque or a normal fluctuation in the measurement value of the measuring sensor. This does not indicate that the range extender has malfunctioned or is about to malfunction, and no emergency measures are needed for the range extender.

[0102] Step S406: Determine whether the duration of the actual torque difference is greater than the threshold value of the actual torque difference duration. If yes, then the safety monitoring information is determined as torque abnormality information; if no, then the safety monitoring information is determined as torque normal information.

[0103] In this embodiment, abnormal torque information refers to a situation where the range extender's torque has deviated from the normal torque range, but there is still some time before a runaway event occurs. In this case, it is only necessary to reduce the range extender's torque without completely shutting it down. The normal torque range is obtained through experimental measurements of the range extender's hardware by the operator.

[0104] Step S407: The safety monitoring information is determined to be torque fault information.

[0105] In this embodiment, torque fault information means that the torque of the range extender has deviated far from the normal torque range, and a runaway situation is about to occur or has already occurred. At this time, it is necessary to quickly reduce the torque and speed of the range extender, and the range extender needs to be completely shut down to avoid damage to the internal components of the car caused by the high voltage caused by the runaway situation.

[0106] Step S408: Calculate the difference between the actual torque and the target torque for power generation to obtain the second torque difference.

[0107] In this embodiment, when the range extender is in generator mode or shutdown mode, it indicates that the range extender has successfully generated electricity. At this time, it is necessary to determine whether the actual torque of the range extender is too high, and whether it may cause the engine and motor to rotate too fast, potentially damaging the vehicle's internal components due to high voltage. This is achieved by subtracting the actual torque from the target generator torque to obtain a second torque difference value. This second torque difference value is then compared with a manually set second torque difference threshold to determine if the current torque is too high. When the actual torque is too high, measures must be taken to prevent the high voltage generated by the motor from damaging the vehicle's internal components. Specifically, when the actual torque exceeds the target generator torque, the range extender begins generating electricity. The target generator torque is determined by hardware properties and can be measured experimentally.

[0108] Step S409: Determine whether the second torque difference is greater than the third torque difference threshold. If yes, proceed to step S410; otherwise, determine the safety monitoring information as normal torque information.

[0109] In this embodiment, the second torque difference threshold can be manually set, obtained by multiplying the actual torque by a manually set coefficient, or it can be determined by the hardware attributes of the range extender and measured through manual experimentation. When the second torque difference is greater than the third torque difference threshold, it indicates that the current torque of the range extender is too high, and countermeasures need to be taken to reduce the torque of the range extender, thereby preventing the engine from driving the motor to rotate too fast and generating too much high voltage electricity, which could damage other components in the vehicle. When the second torque difference is less than the third torque difference threshold, it indicates that the current torque of the range extender is not too high, and no measures need to be taken to reduce the torque and speed of the range extender.

[0110] Step S410: Determine whether the second torque difference is less than the fourth torque difference threshold. If yes, proceed to step S412; otherwise, proceed to step S411.

[0111] In this embodiment, the third and fourth torque difference thresholds can be manually set, obtained by multiplying the actual torque by a manually set coefficient, or determined by the hardware attributes of the range extender and measured through manual experiments. When the second torque difference is greater than the third torque difference threshold but less than the fourth torque difference threshold, it indicates that the current torque of the range extender is too high, posing a risk of runaway. However, there is still some time before runaway occurs. At this time, countermeasures need to be taken to reduce the torque of the range extender to prevent it from continuing to rise, thereby preventing the engine from generating excessive high-voltage electricity that could damage the components inside the vehicle. When the second torque difference is greater than the fourth torque difference threshold, it indicates that the current torque of the range extender is already far higher than the normal torque, and runaway is likely to occur at the next moment, or it may have already occurred. When it is determined that runaway is about to occur or has already occurred, emergency measures should be taken for the range extender, and if necessary, the range extender should be stopped to prevent damage to the components inside the vehicle.

[0112] Step S411: Determine whether the duration of the actual torque difference is greater than the threshold value of the actual torque difference duration. If yes, proceed to step S413; otherwise, determine the safety monitoring information as torque abnormality information.

[0113] In this embodiment, the actual torque difference duration threshold can be manually set, which can be determined based on experimental data after hardware testing. When the actual torque difference duration is greater than the actual torque difference duration threshold, it indicates that the current actual torque has far exceeded the normal torque range. Emergency measures should be taken to shut down the range extender immediately; otherwise, excessive torque from the range extender and excessive power generation from the engine-driven motor may damage various components in the vehicle. When the actual torque difference duration is less than the actual torque difference duration threshold, it indicates that the current actual torque exceeding the normal torque range is highly likely a normal fluctuation in torque or a normal fluctuation in the measurement value of the measuring sensor. This does not indicate that the range extender has malfunctioned or is about to malfunction, and no emergency measures are needed for the range extender.

[0114] Step S412: Determine whether the duration of the actual torque difference is greater than the threshold value of the actual torque difference. If yes, then the safety monitoring information is determined as torque abnormality information; otherwise, the safety monitoring information is determined as torque normal information.

[0115] In this embodiment, abnormal torque information refers to a situation where the range extender's torque has deviated from the normal torque range, but there is still some time before a runaway event occurs. In this case, it is only necessary to reduce the range extender's torque and speed without completely shutting it down. The normal torque range is obtained through experimental measurements of the range extender's hardware by the operator.

[0116] Step S413: The safety monitoring information is determined to be torque fault information.

[0117] In this embodiment, the speed fault information means that the torque of the range extender has deviated from the normal torque range, and a runaway situation is about to occur or has already occurred. At this time, it is necessary to quickly reduce the torque and speed of the range extender, and the power source of the range extender needs to be completely shut off to avoid damage to the internal parts of the car caused by the high voltage caused by the runaway situation.

[0118] The range extender operation safety monitoring method provided in this application improves the accuracy of torque monitoring by real-time monitoring. When the range extender is in start-up mode, it determines whether the actual torque exceeds the normal torque range if the actual torque is higher than the target torque for normal start-up. It also determines whether the torque value exceeding the normal torque range is a normal fluctuation or a normal fluctuation in sensor measurements, thereby improving the accuracy of torque anomaly monitoring and facilitating timely measures to prevent damage to internal vehicle parts when torque anomalies occur. When the range extender is in generator or shutdown mode, it determines whether the actual torque exceeds the normal torque range if the actual torque is higher than the target generator torque for normal generator operation. It also determines whether the torque value exceeding the normal torque range is a normal fluctuation or a normal fluctuation in sensor measurements, thereby improving the accuracy of range extender fault diagnosis. This allows for timely emergency measures to be taken before the range extender is about to overshoot, preventing damage to internal vehicle parts due to overshoot.

[0119] Figure 5 The flowchart illustrating the implementation of the range extender operation safety monitoring method provided in Embodiment 5 of this application is shown. Its difference from Embodiment 4 described above lies in:

[0120] Step S501: Determine whether the safety monitoring information is abnormal torque information. If yes, proceed to step S502; otherwise, proceed to step S503.

[0121] In this embodiment, the abnormal torque information is used to indicate that the torque of the current range extender has exceeded the normal speed, but has not deviated by much. At this time, it is only necessary to reduce the torque and speed of the range extender to avoid the runaway situation.

[0122] Step S502: Reduce the torque of the range extender's engine to within the normal torque range until the range extender stops.

[0123] In this embodiment, the torque of the current range extender has exceeded the normal torque, but not by much. At this time, it is only necessary to reduce the torque of the range extender to avoid the runaway situation, without having to completely cut off the power source of the range extender.

[0124] Step S503: Determine whether the safety monitoring information is torque fault information. If yes, reduce the torque of the range extender's engine, the speed of the range extender's engine, and the speed of the range extender's motor until the range extender stops. If no, do not reduce the torque of the range extender's engine, the speed of the range extender's engine, and the speed of the range extender's motor.

[0125] In this embodiment, when the safety monitoring information does not show abnormal torque information, it could be either torque fault information or normal torque information. Torque fault information indicates that the current torque of the range extender has far exceeded the normal torque range, and even if overspeeding has not yet occurred, it is imminent. Therefore, emergency measures need to be taken for the range extender, namely reducing the torque, speed, and motor speed of the range extender's engine. This reduces the range extender torque while simultaneously shutting down the engine, and the reduced motor speed drives the engine speed down. Otherwise, the high-voltage electricity generated by the engine driving the motor at continuous high speed will damage internal vehicle components. Normal torque information indicates that the current torque of the range extender is within the normal speed range, and no measures to reduce torque or shut down the range extender are required.

[0126] In this embodiment, when the range extender experiences abnormal torque in start-up mode, it indicates abnormal torque fluctuations. This suggests unstable torque control in the range extender and a potential problem with the transmission system. The necessary measures could include reducing the motor speed until it stops, investigating the cause, and preventing further system damage, as well as addressing issues like excessively high or low torque. When the range extender experiences torque failure in start-up mode, it indicates that the range extender has lost control during startup. The necessary measures could include cutting off the motor's power at low voltage, investigating the cause, and preventing stalling at low speeds that could lead to overheating and damage, thereby reducing risk. When the range extender experiences abnormal torque in generator mode, it indicates unstable power generation during operation, potentially suggesting a problem with the operating system. Measures to be taken include reducing engine torque and motor speed. The cause must be investigated to prevent further system damage, and excessively high or low speeds should be avoided. Conversely, when the range extender experiences torque failure in generator mode, it indicates uncontrolled operation. Measures to be taken include cutting off fuel and low-voltage power to the engine and generator. The cause must be investigated to prevent misfiring, knocking, and vibration. It is also crucial to prevent the high-voltage electricity generated by the range extender from damaging internal vehicle components, excessively low torque leading to over-discharge of the battery pack, or excessively high torque leading to overcharging of the battery pack. When the range extender experiences abnormal torque in shutdown mode, it indicates abnormal fluctuations in the range extender. The necessary measures include disconnecting the low-voltage power to the engine, investigating the cause, and preventing further system damage and runaway due to excessive speed. Similarly, when the range extender experiences torque failure in shutdown mode, the necessary measures include disconnecting the low-voltage power to the motor, investigating the cause, and preventing further system damage and runaway due to excessive speed.

[0127] The range extender operation safety monitoring method provided in this application indicates whether the range extender is in an abnormal state based on safety monitoring information. Different measures are taken for the range extender based on different safety monitoring information to prevent runaway situations, thereby ensuring that various parts of the vehicle are not damaged by excessive high-voltage electricity generated by the motor. When the torque of the range extender is far higher than the normal torque range, and the torque does not decrease after torque reduction measures are taken, the speed of the range extender motor is reduced to drag the engine speed of the range extender down, thereby gradually reducing the engine speed of the range extender to the normal speed range. This effectively avoids damage to various vehicle parts caused by high voltage inside the vehicle due to excessively high range extender speed.

[0128] Corresponding to the method in the above embodiments, Figure 6 The diagram shows a structural block diagram of the range extender operation safety monitoring device provided in the embodiments of this application. For ease of explanation, only the parts related to the embodiments of this application are shown. Figure 6The example range extender operation safety monitoring device can be the execution subject of the range extender operation safety monitoring method provided in the aforementioned embodiment 1.

[0129] Reference Figure 6 The range extender's operational safety monitoring device includes:

[0130] The information acquisition module 610 is used to acquire the operating parameters, operating parameter duration, and operating mode information of the range extender.

[0131] The operating parameter threshold calculation module 620 is used to calculate the operating parameter threshold based on the operating mode information and the operating parameters; and

[0132] The safety monitoring information generation module 630 is used to obtain the safety monitoring information of the range extender based on the operating mode information, operating parameters, operating parameter duration, operating parameter threshold, preset target parameters, and preset duration threshold.

[0133] The process by which each module in the range extender operation safety monitoring device provided in this application implements its respective function can be found in the foregoing. Figure 1 The description of Embodiment 1 shown will not be repeated here.

[0134] It should be understood that the sequence number of each step in the above embodiments does not imply the order of execution. The execution order of each process should be determined by its function and internal logic, and should not constitute any limitation on the implementation process of the embodiments of this application.

[0135] It should be understood that, when used in this application specification and the appended claims, the term "comprising" indicates the presence of the described features, integrals, steps, operations, elements and / or components, but does not exclude the presence or addition of one or more other features, integrals, steps, operations, elements, components and / or a collection thereof.

[0136] It should also be understood that the term “and / or” as used in this application specification and the appended claims means any combination of one or more of the associated listed items and all possible combinations, and includes such combinations.

[0137] As used in this application specification and the appended claims, the term "if" may be interpreted, depending on the context, as "when," "once," "in response to determination," or "in response to detection." Similarly, the phrase "if determined" or "if detected [the described condition or event]" may be interpreted, depending on the context, as meaning "once determined," "in response to determination," "once detected [the described condition or event]," or "in response to detection [the described condition or event]."

[0138] Furthermore, in the description of this application and the appended claims, the terms "first," "second," "third," etc., are used only for distinguishing descriptions and should not be construed as indicating or implying relative importance. It should also be understood that although the terms "first," "second," etc., are used in the text to describe various elements in some embodiments of this application, these elements should not be limited by these terms. These terms are merely used to distinguish one element from another. For example, a first table may be named a second table, and similarly, a second table may be named a first table, without departing from the scope of the various described embodiments. Both the first table and the second table are tables, but they are not the same table.

[0139] References to "one embodiment" or "some embodiments" as described in this specification mean that one or more embodiments of this application include a specific feature, structure, or characteristic described in connection with that embodiment. Therefore, the phrases "in one embodiment," "in some embodiments," "in other embodiments," "in still other embodiments," etc., appearing in different parts of this specification do not necessarily refer to the same embodiment, but rather mean "one or more, but not all, embodiments," unless otherwise specifically emphasized. The terms "comprising," "including," "having," and variations thereof mean "including but not limited to," unless otherwise specifically emphasized.

[0140] The range extender operation safety monitoring method provided in this application embodiment can be applied to terminal devices such as mobile phones, tablets, wearable devices, vehicle-mounted devices, augmented reality (AR) / virtual reality (VR) devices, laptops, ultra-mobile personal computers (UMPCs), netbooks, and personal digital assistants (PDAs). This application embodiment does not impose any restrictions on the specific type of terminal device.

[0141] Figure 7 This is a schematic diagram of the structure of a terminal device provided in an embodiment of this application. For example... Figure 7 As shown, the terminal device 7 of this embodiment includes: at least one processor 70 ( Figure 7 Only one is shown in the image), and a memory 71 is stored in which a computer program 72 can be run on the processor 70. When the processor 70 executes the computer program 72, it implements the steps in the above embodiments of the range extender operation safety monitoring method, for example... Figure 1Steps S101 to S103 are shown. Alternatively, when the processor 70 executes the computer program 72, it implements the functions of each module / unit in the above-described device embodiments, for example... Figure 6 The functions of the information acquisition module 610 to the safety monitoring information generation module 630 are shown.

[0142] The terminal device 7 can be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor 70 and a memory 71. Those skilled in the art will understand that... Figure 7 This is merely an example of terminal device 7 and does not constitute a limitation on terminal device 7. It may include more or fewer components than shown, or combine certain components, or different components. For example, the terminal device may also include input transmitting devices, network access devices, buses, etc.

[0143] The processor 70 may be a Central Processing Unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or any conventional processor.

[0144] In some embodiments, the memory 71 may be an internal storage unit of the terminal device 7, such as a hard disk or memory of the terminal device 7. The memory 71 may also be an external storage device of the terminal device 7, such as a plug-in hard disk, smart media card (SMC), secure digital card (SD), flash card, etc., equipped on the terminal device 7. Furthermore, the memory 71 may include both internal and external storage units of the terminal device 7. The memory 71 is used to store the operating system, applications, bootloader, data, and other programs, such as the program code of the computer program. The memory 71 can also be used to temporarily store data that has been sent or will be sent.

[0145] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0146] This application also provides a terminal device, which includes at least one memory, at least one processor, and a computer program stored in the at least one memory and executable on the at least one processor. When the processor executes the computer program, it causes the terminal device to implement the steps in any of the above method embodiments.

[0147] This application also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the steps described in the various method embodiments above.

[0148] This application provides a computer program product that, when run on a terminal device, enables the terminal device to implement the steps described in the various method embodiments above.

[0149] If the integrated module / unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, a recording medium, a USB flash drive, a portable hard drive, a magnetic disk, an optical disk, a computer memory, a read-only memory (ROM), a random access memory (RAM), an electrical carrier signal, a telecommunication signal, and a software distribution medium, etc.

[0150] In the above embodiments, the descriptions of each embodiment have different focuses. For parts that are not described in detail or recorded in a certain embodiment, please refer to the relevant descriptions of other embodiments.

[0151] Those skilled in the art will recognize that the units and algorithm steps of the various examples described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, or a combination of computer software and electronic hardware. Whether these functions are implemented in hardware or software depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered beyond the scope of this application.

[0152] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0153] The above-described embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application, and should all be included within the protection scope of this application.

Claims

1. A method for monitoring the operational safety of a range extender, characterized in that, include: Obtain the operating parameters, duration of operating parameters, and operating mode information of the range extender; Based on the operating mode information, calculate the operating parameter threshold according to the operating parameters; Based on the operating mode information, operating parameters, operating parameter duration, operating parameter threshold, preset target parameters, and preset duration threshold, the safety monitoring information of the range extender is obtained. The operating mode information includes startup mode, power generation mode, and shutdown mode; The operating parameters include the actual rotational speed; The operating parameter thresholds include the speed difference threshold; The speed difference threshold includes a first speed difference threshold, a second speed difference threshold, a third speed difference threshold, and a fourth speed difference threshold. The first speed difference threshold is less than the second speed difference threshold, and the third speed difference threshold is less than the fourth speed difference threshold. The target parameters include the target starting speed and the target power generation speed; The duration of the operating parameters includes the duration of the actual speed difference; The duration threshold includes the actual speed difference duration threshold; The safety monitoring information includes abnormal speed information and speed fault information; The step of obtaining the safety monitoring information of the range extender based on the operating mode information, operating parameters, operating parameter duration, operating parameter threshold, preset target parameters, and preset duration threshold specifically includes: When the operating mode information is the startup mode, the difference between the actual speed and the startup target speed is calculated to obtain the first speed difference. When the first speed difference is greater than the first speed difference threshold, determine whether the first speed difference is less than the second speed difference threshold; If so, when the duration of the actual speed difference exceeds the threshold value for the duration of the actual speed difference, the safety monitoring information is determined to be speed abnormality information; If not, when the duration of the actual speed difference exceeds the threshold of the actual speed difference duration, the safety monitoring information will be determined as speed fault information; When the operating mode information is the power generation mode or the shutdown mode, the difference between the actual speed and the target power generation speed is calculated to obtain the second speed difference. When the second speed difference is greater than the third speed difference threshold, determine whether the second speed difference is less than the fourth speed difference threshold; If so, when the duration of the actual speed difference exceeds the threshold value for the duration of the actual speed difference, the safety monitoring information is determined to be speed abnormality information; If not, when the duration of the actual speed difference exceeds the threshold of the actual speed difference duration, the safety monitoring information will be identified as speed fault information.

2. The method for monitoring the operational safety of a range extender as described in claim 1, characterized in that, After the step of obtaining the safety monitoring information of the range extender based on the operating mode information, the operating parameters, the operating parameter thresholds, the preset target parameters, and the preset duration thresholds, the method further includes: When the safety monitoring information indicates abnormal speed, the range extender will be shut down. When the safety monitoring information is a speed fault, the fuel supply to the range extender's engine will be cut off. If the speed of the range extender motor does not decrease, the power to the range extender motor is cut off until the range extender stops.

3. The method for monitoring the operational safety of a range extender as described in claim 1, characterized in that, The operating parameters also include actual torque; The operating parameter thresholds also include torque difference thresholds; The torque difference threshold includes a first torque difference threshold, a second torque difference threshold, a third torque difference threshold, and a fourth torque difference threshold, wherein the first torque difference threshold is less than the second torque difference threshold, and the third torque difference threshold is less than the fourth torque difference threshold. The target parameters also include the target torque for starting and the target torque for power generation; The duration of the operating parameters also includes the duration of the actual torque difference; The duration threshold also includes the actual torque difference duration threshold; The safety monitoring information also includes torque anomaly information and torque fault information; The step of obtaining the safety monitoring information of the range extender based on the operating mode information, operating parameters, operating parameter duration, operating parameter threshold, preset target parameters, and preset duration threshold further includes: When the operating mode information is the start-up mode, the difference between the actual torque and the target start-up torque is calculated to obtain the first torque difference. When the first torque difference is greater than the first torque difference threshold, determine whether the first torque difference is less than the second torque difference threshold; If so, when the duration of the actual torque difference exceeds the threshold value for the duration of the actual torque difference, the safety monitoring information is determined to be torque anomaly information; If not, when the duration of the actual torque difference exceeds the threshold of the actual torque difference duration, the safety monitoring information will be determined as torque fault information; When the operating mode information is the power generation mode or the shutdown mode, the difference between the actual torque and the power generation target torque is calculated to obtain the second torque difference. When the second torque difference is greater than the third torque difference threshold, it is determined whether the second torque difference is less than the fourth torque difference threshold; If so, when the duration of the actual torque difference exceeds the threshold value for the duration of the actual torque difference, the safety monitoring information is determined to be torque anomaly information; If not, when the duration of the actual torque difference exceeds the threshold of the actual torque difference duration, the safety monitoring information will be identified as torque fault information.

4. The method for monitoring the operational safety of a range extender as described in claim 3, characterized in that, After the step of obtaining the safety monitoring information of the range extender based on the operating mode information, the operating parameters, the operating parameter thresholds, the preset target parameters, and the preset duration thresholds, the method further includes: When the safety monitoring information is abnormal torque information, the torque of the range extender's engine will be reduced to the normal torque range of the engine until the range extender stops. When the safety monitoring information is a torque fault, the torque of the range extender's engine, the speed of the range extender's engine, and the speed of the range extender's motor will be reduced until the range extender stops.

5. The method for monitoring the operational safety of a range extender as described in claim 1, characterized in that, After obtaining the safety monitoring information of the range extender based on the operating mode information, operating parameters, operating parameter duration, operating parameter threshold, preset target parameters, and preset duration threshold, the method further includes: When the operating parameters exceed the preset operating limit parameters, the range extender's engine is shut off from fuel and power, and the range extender's output voltage is supplied to the battery pack.

6. A range extender operation safety monitoring device, characterized in that, include: The information acquisition module is used to acquire the operating parameters, operating parameter durations, and operating mode information of the range extender. The operation parameter threshold calculation module is used to calculate the operation parameter threshold based on the operation mode information and the operation parameters. as well as The safety monitoring information generation module is used to obtain the safety monitoring information of the range extender based on the operating mode information, operating parameters, operating parameter duration, operating parameter threshold, preset target parameters, and preset duration threshold. The operating mode information includes startup mode, power generation mode, and shutdown mode; The operating parameters include the actual rotational speed; The operating parameter thresholds include the speed difference threshold; The speed difference threshold includes a first speed difference threshold, a second speed difference threshold, a third speed difference threshold, and a fourth speed difference threshold. The first speed difference threshold is less than the second speed difference threshold, and the third speed difference threshold is less than the fourth speed difference threshold. The target parameters include the target starting speed and the target power generation speed; The duration of the operating parameters includes the duration of the actual speed difference; The duration threshold includes the actual speed difference duration threshold; The safety monitoring information includes abnormal speed information and speed fault information; The step of obtaining the safety monitoring information of the range extender based on the operating mode information, operating parameters, operating parameter duration, operating parameter threshold, preset target parameters, and preset duration threshold specifically includes: When the operating mode information is the startup mode, the difference between the actual speed and the startup target speed is calculated to obtain the first speed difference. When the first speed difference is greater than the first speed difference threshold, determine whether the first speed difference is less than the second speed difference threshold; If so, when the duration of the actual speed difference exceeds the threshold value for the duration of the actual speed difference, the safety monitoring information is determined to be speed abnormality information; If not, when the duration of the actual speed difference exceeds the threshold of the actual speed difference duration, the safety monitoring information will be determined as speed fault information; When the operating mode information is the power generation mode or the shutdown mode, the difference between the actual speed and the target power generation speed is calculated to obtain the second speed difference. When the second speed difference is greater than the third speed difference threshold, determine whether the second speed difference is less than the fourth speed difference threshold; If so, when the duration of the actual speed difference exceeds the threshold value for the duration of the actual speed difference, the safety monitoring information is determined to be speed abnormality information; If not, when the duration of the actual speed difference exceeds the threshold of the actual speed difference duration, the safety monitoring information will be identified as speed fault information.

7. A terminal device, characterized in that, The terminal device includes a memory and a processor. The memory stores a computer program that can run on the processor. When the processor executes the computer program, it implements the steps of the method as described in any one of claims 1 to 5.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1 to 5.

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