A torque limiting control method and system for a range extender

Abstract

The application discloses a torque limiting control method and system for a range extender, and the method comprises the following steps: determining a first load threshold, a second load threshold and a third load threshold of an engine according to an altitude and an engine coolant temperature; acquiring an engine load rate of the range extender in real time at a set sampling interval, comparing the engine load rate with the first load threshold, the second load threshold and the third load threshold, and obtaining a comparison result; and limiting a target torque according to the comparison result. According to the application, the generator torque is dynamically limited according to the engine load rate, so that the range extender system can be smoothly transited in the process of torque limiting, sudden changes in power output can be avoided, the load rate can be prevented from fluctuating sharply, the system stability can be maintained, the system failure of the range extender can be reduced, and the reliability can be improved.

Description

Technical Field

[0001] This application belongs to the field of range extender technology, specifically relating to a torque limiting control method and system for a range extender, and more specifically to a torque limiting control method and system for a range extender used in engineering machinery. Background Technology

[0002] Traditional construction machinery suffers from severe environmental pollution due to the large emissions of carbon dioxide, nitrogen oxides, and particulate matter from internal combustion engines. It also suffers from low fuel efficiency, high operating costs, and high energy consumption, resulting in significant pollution, high energy consumption, and high noise levels. To address these issues, new energy technologies are increasingly being applied to the construction machinery sector. However, the limitations of pure electric solutions fail to resolve some key issues related to the electrification of construction machinery. Therefore, range-extended hybrid powertrain technology is proposed to address the current emission and energy problems of non-road construction machinery. This solution effectively solves the problems of high purchase cost, range anxiety, and inadequate charging infrastructure associated with pure electric vehicles, while also meeting the continuous operation requirements of construction machinery.

[0003] During the operation of the range extender, when the vehicle or equipment is under high load conditions (such as climbing hills or heavy-load operations), the range extender needs to output more power, which may cause it to exceed the engine load and result in unstable power output of the range extender, affecting the vehicle's acceleration and climbing performance, and even causing the engine to stall. Especially in some high-altitude and cold environments, the engine performance will decrease, and the engine may not be able to work normally under the same power compared to the normal temperature environment. Summary of the Invention

[0004] Objective: In view of at least one of the above technical problems, this application provides a range extender torque limiting control method and system, which dynamically limits the generator torque demand based on the engine load rate. This allows the range extender system to transition smoothly during the torque limiting process, avoids sudden changes in power output, prevents drastic fluctuations in load rate, maintains system stability, reduces system failures of the range extender, and improves reliability.

[0005] Technical solution: To solve the above-mentioned technical problems, the technical solution adopted in this application is as follows:

[0006] Firstly, a method for controlling the torque limitation of a range extender is provided, including:

[0007] The engine's first load threshold, second load threshold, and third load threshold are determined based on altitude and engine coolant temperature; wherein the first load threshold < the second load threshold < the third load threshold; and the first load threshold, second load threshold, and third load threshold are all greater than the engine's maximum sustainable operating load.

[0008] According to the set sampling interval, the engine load rate of the range extender is acquired in real time, and the engine load rate is compared with the first load threshold, the second load threshold, and the third load threshold to obtain the comparison result;

[0009] The target torque is limited based on the comparison results.

[0010] In some embodiments, limiting the target torque based on the comparison results includes:

[0011] If the engine load rate is greater than the first load threshold and less than the second load threshold, and the first running time exceeds the first time threshold, the torque limiting coefficient limits the target torque to a fixed value; wherein, the first running time is the continuous running time during which the engine load rate is greater than the first load threshold;

[0012] If the engine load rate is greater than or equal to the second load threshold and less than the third load threshold, and the second running time exceeds the second time threshold, the torque limiting coefficient decreases linearly according to the proportion of the engine load rate exceeding the threshold to limit the target torque; where the proportion of the engine load rate exceeding the threshold is: engine load rate With the first load threshold The difference, the third load threshold With the first load threshold Ratio of differences The second operating time is the continuous operating time when the engine load rate is greater than the second load threshold.

[0013] If the engine load rate is greater than or equal to the third load threshold, the torque limiting coefficient decreases linearly at the first rate to limit the target torque until the engine load rate is less than the set load rate. Then, the torque limiting coefficient increases linearly at the second rate until the engine load rate returns to the first load threshold. Finally, the current torque limiting coefficient is maintained to limit the target torque. The first rate is greater than the second rate.

[0014] In some embodiments, the fixed value is 0.9-0.95;

[0015] In some embodiments, the load rate is set to ;

[0016] In some embodiments, the first rate is 0.01~0.05 / 10ms. -1 ;

[0017] In some embodiments, the second rate is 0.01~0.05 / 500ms. -1 .

[0018] In a second aspect, a range extender controller is provided, including a processor and a storage medium;

[0019] The storage medium is used to store instructions;

[0020] The processor is configured to operate according to the instructions to perform the steps according to the method.

[0021] Thirdly, a range extender torque limiting control system is provided, including the aforementioned range extender controller.

[0022] In some embodiments, the range extender torque limiting control system further includes tire pressure and temperature sensors and actuators;

[0023] The tire pressure and temperature sensors are installed on each tire of the construction machinery to detect tire pressure and tire temperature and upload the data to the range extender controller.

[0024] The actuator is signal-connected to the range extender controller.

[0025] Fourthly, an engineering machine is provided, which is equipped with the range extender controller or the range extender torque limiting control system.

[0026] Compared with the prior art, the beneficial effects achieved by this application are as follows:

[0027] (1) The torque limiting method for the range extender for engineering machinery proposed in this application adopts a multi-threshold control method of first load threshold, second load threshold and third load threshold, which can effectively reduce the high load running time of the engine, improve the performance of the range extender system, ensure the smooth operation of the range extender during the torque limiting process, and at the same time improve the fuel economy and power output stability of the range extender, and avoid problems such as emission deterioration and carbon deposits of the range extender.

[0028] (2) The control method proposed in this application for limiting the generator torque by a fixed value, a linear limit, and a nonlinear limit based on the first load threshold, the second load threshold, and the third load threshold of the engine, respectively, can achieve smooth torque transition, so that the range extender can provide as much power as possible to the battery or the whole vehicle while ensuring that the engine does not stall or even fail, so as to ensure the stability of the whole vehicle operation.

[0029] (3) The thresholds proposed in this application can be dynamically adjusted according to the real-time status of the engine (such as engine water temperature, altitude, etc.), and the control method of keeping each threshold stable within a certain range of changes in the real-time status of the engine can effectively avoid the problem that the engine can work normally in the plain environment at normal temperature, but its performance is reduced in the high-altitude, cold and hot environment, leading to engine stalling or mechanical shock, and avoids high-load operation that reduces engine life or damages the engine.

[0030] (4) The torque control method for the range extender for construction machinery proposed in this application can effectively prevent the engine from stalling due to high load operation of the range extender, avoid the range extender from suddenly stalling and being unable to charge when the battery power is too low, thus preventing the vehicle from breaking down, and improving the overall vehicle operation safety and reliability. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 This is a schematic flowchart of the range extender torque limiting control method according to an embodiment of this application;

[0033] Figure 2 This is a schematic flowchart of a range extender torque limiting control method according to a specific embodiment of this application;

[0034] Figure 3 This is a schematic diagram of the range extender torque limiting control system according to an embodiment of this application; Detailed Implementation

[0035] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use.

[0036] In the description of this application, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to explain the relative positional relationship and movement between components in a specific orientation. If the specific orientation changes, the directional indication will also change accordingly. These terms are used only for the convenience of describing this application and for simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] Furthermore, the terms "first," "second," etc., 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. Therefore, a feature defined with "first," "second," etc., may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more.

[0038] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection between two components. Those skilled in the art will understand the specific meaning of the above terms in this application based on the specific circumstances.

[0039] In related technologies, torque limiting for range extenders is mostly determined based on conditions such as power, temperature, and speed. When these conditions exceed a certain threshold, the torque is reset to zero, or a fixed threshold or simple linear adjustment method is used to limit the torque. This method can prevent problems such as overload operation, excessive temperature, or damage to the electric equipment. Most existing range extenders limit generator torque output through engine external characteristics. However, since some engine accessories consume some torque, during normal engine operation, the torque may not reach the engine external characteristics, leading to excessive engine load and stalling. Moreover, existing technologies do not consider environmental factors. In high-altitude, cold, and high-temperature environments, the system performance may be poor. Relying solely on engine external characteristics to limit generator torque output may cause the engine to stall due to sudden excessive load, failing to guarantee sufficient energy supply to the battery and reducing the stability of the entire vehicle. If a vehicle is under high load (such as climbing a hill or driving at high speed), the range extender may stall due to excessive engine load, causing the battery SOC to drop rapidly, resulting in battery depletion, loss of vehicle power, or even breakdown. Therefore, this application proposes a method for range extenders to dynamically limit the generated torque based on the engine load rate to determine the current engine operating condition, thereby preventing engine stalling, improving range extender performance, reducing the possibility of vehicle malfunctions, improving vehicle reliability, and ensuring that the range extender can stably charge the power battery.

[0040] Example 1: As Figure 1 As shown, this application provides a torque limiting control method for a range extender, comprising:

[0041] Step S1: Determine the first load threshold of the engine based on altitude and engine coolant temperature. Second load threshold Third load threshold Among them, the first load threshold <Second load threshold <Third load threshold And the first load threshold Second load threshold Third load threshold All of these exceed the maximum continuous operating load provided by the engine.

[0042] In step S1 above, the performance of the range extender varies depending on the environment, especially in high-altitude, cold, and hot regions where engine performance may decline. Therefore, to ensure normal engine operation in different regions and avoid overload operation that could lead to engine stalling or mechanical damage, it is necessary to determine the engine's first load threshold (low load threshold), second load threshold (medium load threshold), and third load threshold (high load threshold) based on altitude and engine coolant temperature; see Table 1 for details.

[0043]

[0044] The table above defines the engine load rate thresholds (Map) at different altitudes and engine coolant temperatures. Based on the determined first, second, and third load thresholds, the range extender's torque is limited to prevent it from operating under overload for extended periods, which could lead to emissions degradation or sudden engine stalling due to excessive load.

[0045] For example, in some embodiments, the first load threshold The second load threshold is 0.90. The third load threshold is 0.95. It is 0.99.

[0046] Step S2: Obtain the engine load rate of the range extender in real time according to the set sampling interval. The engine load rate is compared with the first load threshold, the second load threshold, and the third load threshold to obtain the comparison results.

[0047] In some embodiments, the sampling interval is 10ms.

[0048] Step S3: Limit the target torque based on the comparison results.

[0049] In step S3 above, the target torque is limited based on the comparison results, specifically including:

[0050] If the engine load rate is greater than the first load threshold And less than the second load threshold And the first running time exceeds the first time threshold T aThe torque limiting coefficient limits the target torque to a fixed value; wherein, the first operating time is when the engine load rate is greater than the first load threshold. The duration of continuous operation;

[0051] If the engine load rate is greater than or equal to the second load threshold And less than the third load threshold And the second running time exceeds the second time threshold T b The torque limiting coefficient decreases linearly with the proportion of engine load exceeding the limit to limit the target torque; where the proportion of engine load exceeding the limit is: engine load rate With the first load threshold The difference, the third load threshold With the first load threshold Ratio of differences The second running time is when the engine load rate is greater than the second load threshold. The duration of continuous operation;

[0052] If the engine load rate is greater than or equal to the third load threshold The torque limiting coefficient decreases linearly at a first rate to limit the target torque until the engine load rate is less than the set load rate. After that, the torque limiting coefficient increases linearly at a second rate until the engine load rate returns to the first load threshold. Then, the target torque is limited by maintaining the current torque limit coefficient; wherein, the first rate is greater than the second rate.

[0053] In some embodiments, the load rate is set to In this embodiment, the load rate is set to 0.97.

[0054] In some embodiments, the first rate is 0.01~0.05 / 10ms. -1 ;

[0055] In some embodiments, the second rate is 0.01~0.05 / 500ms. -1 .

[0056] In some embodiments, exemplarily, such as Figure 2 As shown, the range extender torque limiting control method specifically includes:

[0057] (1) If the engine load rate Less than or equal to the first load threshold There is no limit to the target torque of the generator; the torque limitation coefficient is not specified. Equal to 1, current control torque for:

[0058] ;

[0059] In the formula, This represents the target torque of the generator.

[0060] (2) If the engine load rate is greater than the first load threshold And less than the second load threshold If the first running time does not exceed the first time threshold T a If the torque is within milliseconds, then no torque limit is imposed, and the controlled torque is the target torque. Among them, the engine load rate will first exceed the first load threshold. The start time is taken as the starting point of the first running time, and timing begins thereafter; during the first running time, the engine load rate is always greater than the first load threshold. ;

[0061] If the engine load rate is greater than the first load threshold And less than the second load threshold And the first running time exceeds T a Then the power generation torque is limited, and the torque limitation coefficient is a fixed value. Ultimately, the current control torque for:

[0062] ;

[0063] In the formula, T a The continuous operating time (in milliseconds) when the engine load rate is greater than a first load threshold and less than a second load threshold; in some embodiments, this refers to the time during which the engine can operate continuously when the engine load rate is greater than a first load threshold and less than a second load threshold. The value can range from 0.9 to 0.95.

[0064] (3) When the engine load rate is greater than or equal to the second load threshold And less than the third load threshold If the second running time does not exceed the second time threshold T b If the target torque is not limited, then the engine load rate will be greater than or equal to the second load threshold for the first time. The start time is taken as the starting point of the second running time, and timing begins thereafter; during the second running time, the engine load rate is always equal to or equal to the second load threshold. ;

[0065] If the engine load rate is greater than or equal to the second load threshold And less than the third load threshold And the second running time exceeds T b Then the target torque is limited, and the torque limitation coefficient is applied. for:

[0066] ;

[0067] In the formula, Engine load rate; T b The continuous operating time (in milliseconds) when the engine load rate is greater than or equal to the second load threshold and less than the third load threshold.

[0068] Final current control torque for:

[0069] ;

[0070] (4) When the engine load rate is greater than or equal to the third load threshold The specific implementation steps include:

[0071] In step S401, in response to the engine load rate being greater than or equal to the third load threshold When the current engine load is determined to be high, a high engine load indicator should be set up.

[0072] In step S402, after the engine load high indicator is set in step S401, the torque limiting function is initiated, with the initial torque value being the original target torque. That is, the initial value of the torque limiting coefficient is 1. When the torque limiting function is activated, the torque limiting coefficient starts from 1 and decreases at a first rate (in this embodiment, the first rate is 0.01 / 10ms). -1 )decline;

[0073] In step S403, when the engine load rate is less than the set load rate ( When the engine load high flag is cleared in step S401, the torque limit coefficient no longer decreases. Assume the time elapsed from when the engine load high flag is set in step S401 to when it is cleared in step S403 is... (Unit: milliseconds) then the current torque limit coefficient for:

[0074]

[0075] That is, the current control torque for:

[0076]

[0077] In step S404, because the torque limiting coefficient drops rapidly in step S402, the torque drops rapidly, resulting in a rapid decrease in the engine load rate (less than). To ensure stable power output, if the engine load rate is less than [a certain value], [further action is required]. Torque limit coefficient from According to the second rate (in this embodiment, the second rate is 0.01 / 500ms) -1 Slowly increase the load until the engine load rate reaches the first load threshold. The torque limit coefficient will no longer increase; assuming the torque limit coefficient is... Increase to the first load threshold. The elapsed time is (Unit: milliseconds) then the current torque limit coefficient for:

[0078]

[0079] Current control torque for:

[0080]

[0081] It should be noted that during the slow increase of the torque limiting coefficient, if the engine load rate has not yet reached the first load threshold... When the torque limit coefficient is greater than or equal to 1, the current torque limit coefficient is 1.

[0082] In step S405, the torque limiting coefficient from step S404 is used. Torque limiting is applied to ensure stable operation of the range extender until the range extender changes its operating conditions, at which point torque limiting is no longer required.

[0083] It should be noted that the torque limiting coefficient in this application ranges from 0 to 1.

[0084] Example 2: This application provides a range extender controller, including a processor and a storage medium;

[0085] The storage medium is used to store instructions;

[0086] The processor is configured to operate according to the instructions to perform the steps according to the method.

[0087] Example 3: As Figure 3 As shown, this application provides a range extender torque limiting control system, including the range extender controller described in Embodiment 2. The range extender controller includes a processor and a storage medium; the storage medium is used to store instructions; the processor is used to operate according to the instructions to execute the steps of the following range extender torque limiting control method.

[0088] In some embodiments, the range extender torque limiting control system further includes an engine controller (ECU), a generator controller (GCU), a vehicle controller (VCU), a vehicle management system (BMS), and a display screen. The range extender controller (RCU) manages the operating status of the range extender and controls the ECU and GCU to execute corresponding responses based on VCU commands. In this embodiment, the engine controller (ECU) monitors the engine load rate in real time and sends it to the range extender controller (RCU) via a CAN network. The RCU processes the target torque of the generator based on the engine load rate signal and sends the processed torque to the generator controller (GCU) via the CAN network. Simultaneously, the generator controller (GCU) feeds back the real-time torque to the RCU.

[0089] Example 4: This application provides an engineering machine equipped with the range extender controller or the range extender torque limiting control system.

[0090] In summary, in this application, when the construction machinery is in working mode, the tire status parameters are obtained, wherein the tire status parameters include tire pressure and tire temperature, and the pressure change value of each tire per unit time; the tire status parameters are input into the tire anomaly identification model to obtain the tire anomaly identification result; wherein the tire anomaly identification model stores the correspondence between tire temperature, pressure change value of each tire per unit time and pressure of each tire under various working conditions; according to the tire anomaly identification result, the action of the actuator is controlled. If the tire is abnormal and is of medium level, the action speed of the actuator is reduced; if the tire is abnormal and is of severe level, the action of the actuator is stopped, and the bulldozer blade and / or outriggers are controlled to support the ground. (1) By importing abnormal pattern identification data, the abnormal working state of the construction machinery is effectively identified, the abnormal working state is alarmed, the alarm information is uploaded to the data platform, and the action of the entire construction machinery is restricted when necessary, so as to achieve effective protection of the construction machinery. (2) By uploading big data to the data platform, the working condition characteristics and usage habits of the whole machine are analyzed, so as to achieve effective support for the health management of the whole machine.

[0091] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0092] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0093] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0094] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0095] The above description is only a preferred embodiment of this application. It should be noted that those skilled in the art should understand that various changes and improvements may be made to this application without departing from the principles and spirit. These improvements should also be considered within the scope of protection of this application and are not limited to the above embodiments.

Claims

1. A torque limiting control method of a range extender, characterized by, include: The engine's first load threshold, second load threshold, and third load threshold are determined based on altitude and engine coolant temperature; wherein the first load threshold < the second load threshold < the third load threshold; and the first load threshold, second load threshold, and third load threshold are all greater than the engine's maximum sustainable operating load. According to the set sampling interval, the engine load rate of the range extender is acquired in real time, and the engine load rate is compared with the first load threshold, the second load threshold, and the third load threshold to obtain the comparison result; The target torque is limited based on the comparison results, including: If the engine load rate is greater than the first load threshold and less than the second load threshold, and the first running time exceeds the first time threshold, the torque limiting coefficient limits the target torque to a fixed value; wherein, the first running time is the continuous running time during which the engine load rate is greater than the first load threshold; If the engine load rate is greater than or equal to the second load threshold and less than the third load threshold, and the second running time exceeds the second time threshold, the torque limiting coefficient decreases linearly according to the proportion of the engine load rate exceeding the threshold to limit the target torque; where the proportion of the engine load rate exceeding the threshold is: engine load rate With the first load threshold The difference, the third load threshold With the first load threshold Ratio of differences The second operating time is the continuous operating time when the engine load rate is greater than the second load threshold. If the engine load rate is greater than or equal to the third load threshold, the torque limiting coefficient decreases linearly at the first rate to limit the target torque until the engine load rate is less than the set load rate. Then, the torque limiting coefficient increases linearly at the second rate until the engine load rate returns to the first load threshold. Finally, the current torque limiting coefficient is maintained to limit the target torque. The first rate is greater than the second rate.

2. The range extender torque limitation control method according to claim 1, characterized by, The fixed value is 0.9-0.

95.

3. The range extender torque limitation control method according to claim 1, characterized by, The load factor is set to .

4. The range extender torque limiting control method according to claim 1, characterized in that, The first rate is 0.01-0.05 / 10ms -1 .

5. The range extender torque limitation control method according to claim 1, characterized by, The second rate is 0.01-0.05 / 500ms -1 .

6. The range extender torque limitation control method according to claim 1, characterized by, If the engine load rate is greater than or equal to the third load threshold, the torque limiting coefficient decreases linearly at a first rate to limit the target torque until the engine load rate is less than the set load rate. Then, the torque limiting coefficient increases linearly at a second rate until the engine load rate returns to the first load threshold. Finally, the current torque limiting coefficient is maintained to limit the target torque, including: In response to an engine load rate greater than or equal to the third load threshold The engine load indicator is set, and the torque limiting function is activated. The torque limiting coefficient starts from 1 and operates at the first rate. The load rate decreases until it falls below the set load rate, then the high engine load indicator is cleared, and the torque limit coefficient no longer decreases; the time elapsed from setting the high engine load indicator to clearing it is... The unit is milliseconds, which represents the current torque limit coefficient. for: Current control torque for: ; The target torque; If the engine load rate is less than Torque limit coefficient from According to the second rate Increase until the engine load rate reaches the first load threshold. The torque limit factor will no longer increase; the torque limit factor is changed from... Increase to the first load threshold. The elapsed time is The unit is milliseconds; then the current torque limit coefficient. for: Current control torque for: ; According to the torque limiting coefficient The torque limiting is performed until the torque limiting is no longer performed after the range extender is changed in working condition.

7. The range extender torque limitation control method according to claim 6, characterized by, Note that the torque limit coefficient is set to 1 from the time when the engine load factor reaches the first load threshold value until the time when the engine load factor reaches the second load threshold value. The maximum value of the torque limit coefficient is 1 during the period in which the torque limit coefficient increases from​ If the engine load factor has not reached the first load threshold If the torque limiting coefficient is greater than or equal to 1, the current torque limiting coefficient is taken as 1.

8. The range extender torque limitation control method according to claim 1, characterized by, If the engine load rate is greater than the first load threshold and less than the second load threshold, and the first operating time exceeds the first time threshold, the torque limiting coefficient limits the target torque to a fixed value, including: If the engine load rate is greater than the first load threshold And less than the second load threshold If the first running time does not exceed the first time threshold T a If the torque is not limited, the torque limit coefficient is equal to 1, and the control torque is the target torque. When the engine load rate first exceeds the first load threshold. The start time is taken as the starting point of the first running time, and timing begins thereafter; during the first running time, the engine load rate is always greater than the first load threshold. ; If the engine load rate is greater than the first load threshold And less than the second load threshold And the running time exceeds the first time threshold T a Then the torque limiting coefficient is a fixed value. Current control torque for: ； In the formula, Target torque.

9. The range extender torque limitation control method according to claim 1, characterized by, If the engine load rate is greater than or equal to the second load threshold and less than the third load threshold, and the second operating time exceeds the second time threshold, the torque limiting coefficient decreases linearly in proportion to the engine load rate exceeding the threshold to limit the target torque, including: When the engine load rate is greater than or equal to the second load threshold And less than the third load threshold If the second running time does not exceed the second time threshold T b If the torque is not limited, the engine load rate will be greater than or equal to the second load threshold for the first time. The start time is taken as the starting point of the second running time, and timing begins thereafter; during the second running time, the engine load rate is always equal to or equal to the second load threshold. ; If engine load rate Greater than or equal to the second load threshold And less than the third load threshold And the second running time exceeds the second time threshold T b Torque limiting coefficient for: ； Current control torque Is: ; Target torque.

10. A range extender controller, characterized in that, Including processor and storage media; The storage medium is used to store instructions; The processor is configured to operate according to the instructions to perform the steps of the method according to any one of claims 1 to 9.

11. An overrunning device torque limiting control system characterized by, Includes the range extender controller as described in claim 10.

12. A working machine, characterized in that It is equipped with the range extender controller as described in claim 10 or the range extender torque limiting control system as described in claim 11.

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