Torque limiting control method and system for range extender

Abstract

The invention discloses a range extender torque limit control method and system. The method comprises the steps that a first load threshold value, a second load threshold value and a third load threshold value of an engine are determined according to the altitude and the engine coolant temperature; according to the set sampling interval, the engine load rate of the range extender is obtained in real time, the engine load rate is compared with the first load threshold value, the second load threshold value and the third load threshold value, and a comparison result is obtained; and the target torque is limited according to the comparison result. The torque of the generator is dynamically limited according to the load rate of the engine, it is guaranteed that in the torque limiting process, a range extender system is in stable transition, sudden change of power output is avoided, meanwhile, violent fluctuation of the load rate is avoided, the system is kept stable, system faults of the range extender are reduced, and reliability is improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of range extenders, and particularly relates to a range extender torque limiting control method and system, and particularly relates to a range extender torque limiting control method and system for engineering machinery. BACKGROUND

[0002] Traditional engineering machinery has problems such as serious pollution to the environment, low fuel efficiency, high operating cost, large energy consumption, and large noise due to the emission of a large amount of carbon dioxide, nitrogen oxides and particulate matter by the internal combustion engine. In order to solve the above problems, new energy technology is gradually applied to the field of engineering machinery, but due to the limitations of the pure electric scheme, some key problems of engineering machinery new energy cannot be solved. Therefore, the range extender hybrid technology is proposed to solve the current non-road engineering machinery emission and energy problems. This scheme can effectively solve the problems such as high purchase cost, range anxiety and imperfect charging facilities of pure electric products, and meet the demand of continuous operation of engineering machinery.

[0003] During the working process of the range extender, when the vehicle or equipment is in a high load working condition (such as climbing a slope or heavy load operation), the range extender needs to output more power, which may cause the range extender to exceed the engine load and cause the power output of the range extender to be unstable, affecting the vehicle acceleration and climbing performance, and even causing the engine to stall. Especially in some high altitude, high cold and other environments, the engine performance will decrease, and compared with the normal temperature environment, the engine may not work normally under the same power. SUMMARY

[0004] Object: In view of at least one of the above technical problems, the application provides a range extender torque limiting control method and system, which dynamically limits the generator demand torque according to the engine load rate, can smoothly transition the range extender system during torque limiting, avoid power output mutation, avoid load rate fluctuation, keep the system stable, reduce the system failure of the range extender, and improve the reliability.

[0005] Technical solution: In order to solve the above technical problems, the technical solution adopted by the application is:

[0006] In a first aspect, a range extender torque limiting control method is provided, comprising:

[0007] determining a first load threshold, a second load threshold and a third load threshold of the engine according to the altitude and the engine coolant temperature; wherein the first load threshold < the second load threshold < the third load threshold; and the first load threshold, the second load threshold and the third load threshold are all greater than the highest sustainable load provided by the engine;

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

[0009] The target torque is limited according to the comparison result.

[0010] In some embodiments, limiting the target torque according to the comparison result comprises:

[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 at a fixed value; wherein the first running time is the duration that 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 limits the target torque by linearly reducing at a proportion that the engine load rate exceeds; wherein the proportion that the engine load rate exceeds is the ratio of the difference between the engine load rate and the first load threshold to the difference between the third load threshold and the first load threshold; wherein the second running time is the duration that the engine load rate is greater than the second load threshold; ; wherein the second running time is the duration that 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 limits the target torque by linearly reducing at a first rate until the engine load rate is less than a set load rate, then the torque limiting coefficient linearly increases at a second rate until the engine load rate returns to the first load threshold, and then the torque limiting coefficient limits the target torque at the current torque limiting coefficient; wherein 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 set load rate is ;

[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, comprising a processor and a storage medium.

[0019] ​​​​The storage medium is configured to store instructions.

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

[0021] In a third aspect, a range extender torque limiting control system is provided, comprising the range extender controller.

[0022] In some embodiments, the range extender torque limiting control system further comprises a tire pressure and temperature sensor and an actuator.

[0023] The tire pressure and temperature sensor is installed on each tire of the engineering machinery respectively, and is configured to detect tire pressure and tire temperature and upload to the range extender controller.

[0024] The actuator is in signal connection with the range extender controller.

[0025] In a fourth aspect, an engineering machinery is provided, which is configured with the range extender controller or the range extender torque limiting control system.

[0026] Compared with the prior art, the present application has the following beneficial effects:

[0027] (1) The range extender torque limiting method for engineering machinery provided by the present application adopts a multi-threshold control method of a first load threshold, a second load threshold and a third load threshold, which can effectively reduce the engine high load running time, improve the range extender system performance, ensure the smooth operation of the range extender during torque limiting, and improve the fuel economy and power output stability of the range extender, avoiding the problems of emission deterioration and carbon deposition of the range extender;

[0028] (2) The control method provided by the present application, which limits the generator torque according to the first load threshold, the second load threshold and the third load threshold of the engine respectively, can realize smooth torque transition, so that the range extender can provide more power for the battery or the whole vehicle as much as possible under the condition that the engine does not stall or even does not fail, to ensure the stability of the whole vehicle operation;

[0029] (3) The control method provided by the present application, which can dynamically adjust each threshold according to the real-time state of the engine (such as engine water temperature, altitude, etc.), and keep each threshold stable within a certain range of the real-time state of the engine, can effectively avoid the problems of engine stall or mechanical impact caused by the performance reduction of the engine in highland and high-temperature environment under the same power request, and avoid the reduction of engine life or engine damage caused by high load operation;

[0030] (4) The range extender torque control method for engineering machinery provided in the 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 failing to charge when the battery power is too low, and improve the vehicle operation safety and reliability. BRIEF DESCRIPTION OF DRAWINGS

[0031] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without creative effort.

[0032] Figure 1 The range extender torque limiting control method flowchart of an embodiment of the present application;

[0033] Figure 2 The range extender torque limiting control method flowchart of a specific embodiment of the present application;

[0034] Figure 3 The range extender torque limiting control system schematic diagram of an embodiment of the present application; DETAILED DESCRIPTION

[0035] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some embodiments of the present application, not all embodiments. The description of the at least one exemplary embodiment is actually only illustrative, and is by no means any limitation on the present application and its application or use.

[0036] In the description of the present application, it should be understood that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are used only to explain the relative position relationship, movement condition and the like between the components in a certain posture. If the specific posture changes, the directional indication also changes accordingly. It is only for the convenience of describing the present application and simplifying the description, and is not intended to indicate or imply that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application.

[0037] In addition, the terms "first", "second", and the like are used only for descriptive purposes, and should not be construed as indicating or implying relative importance or an indicated number of the technical features. Therefore, the features defined with "first", "second", and the like can explicitly or implicitly include one or more of the features. In the description of the present application, the meaning of "a plurality of" is two or more, unless otherwise specified and limited.

[0038] In the description of the present application, it should be noted that, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connection" should be understood in a broad sense, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be directly connected, or indirectly connected through intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0039] In the related art, the torque limit of the range extender is mostly determined according to the power, temperature, speed and the like. When the above conditions exceed a certain threshold, the torque is cleared or limited by using a fixed threshold or a simple linear adjustment method. This method can prevent the electric equipment from overloading, high temperature or damage; most existing range extenders limit the generator torque output through the engine external characteristic, but since the engine has some accessory power that consumes part of the torque, during normal operation of the engine, it may cause the engine to stall due to excessive load rate when the torque does not reach the engine external characteristic, and the existing technology does not consider environmental factors, which may cause poor system performance in high-altitude, high-cold and high-temperature environments. Simply relying on the engine external characteristic to limit the generator torque output may cause the engine to stall due to sudden high load, which cannot guarantee sufficient energy for the battery and reduces the stability of the vehicle. If the vehicle is under high load (such as climbing or high-speed driving), the range extender may stall due to high engine load, and the battery SOC will decrease rapidly, resulting in battery power depletion, loss of vehicle power, and even breakdown. Therefore, the present application proposes a range extender torque limiting control method, which determines the current engine operating condition according to the engine load rate to dynamically limit the generator torque to prevent the engine from stalling, improve the performance of the range extender, reduce the possibility of vehicle failure, and improve the reliability of the vehicle. At the same time, it can also ensure that the range extender can stably charge the power battery.

[0040] Embodiment 1: As shown in the following table, the present application provides a range extender torque limiting control method, which comprises: Figure 1

[0041] Step S1, determining a first load threshold, a second load threshold and a third load threshold of the engine according to the altitude and the engine coolant temperature , a third load threshold​​ ; wherein the first load threshold < second load threshold < third load threshold , and the first load threshold , the second load threshold , and the third load threshold are all greater than a maximum load that the engine can sustain.

[0042] In the above step S1, the performance of the range extender will be different under different environments, especially in high-altitude, high-cold, and high-temperature areas, the performance of the engine will decrease, and thus, in order to make the engine work normally in different areas and avoid overloading operation to cause engine flameout or mechanical damage, the first load threshold (low load threshold), the second load threshold (medium load threshold), and the third load threshold (high load threshold) of the engine need to be determined according to the altitude and the engine coolant temperature. See Table 1 for details:

[0043]

[0044] The above table determines the engine load rate threshold Map under different altitudes and engine coolant temperatures. According to the determined first load threshold, the second load threshold, and the third load threshold, the torque of the range extender is limited to prevent long-term overloading work from causing emission deterioration or engine sudden flameout due to excessive load.

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

[0046] Step S2, the engine load rate of the range extender is obtained 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, and a comparison result is obtained.

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

[0048] Step S3, the target torque is limited according to the comparison result.

[0049] In the above step S3, the target torque is limited according to the comparison result, which specifically includes:

[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] wherein, is 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 (unit: millisecond), the torque is not limited, and the control torque is the target torque ; wherein the starting time when the engine load rate is first greater than the first load threshold is taken as the starting point of the first running time, and the timing is started; 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 , the generator torque is limited, and the torque limiting coefficient is a fixed value , and the final current control torque is:

[0062] ;

[0063] wherein, T a is the sustainable running time (unit: millisecond) when the engine load rate is greater than the first load threshold and less than the second load threshold; in some embodiments, the value can be 0.9-0.95.

[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 , the target torque is not limited; wherein the starting time when the engine load rate is first greater than or equal to the second load threshold is taken as the starting point of the second running time, and the timing is started; during the second running time, the engine load rate is always 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 , the target torque is limited, and the torque limiting coefficient is:

[0066] ;

[0067] wherein, is the engine load rate; T b is the engine load rate greater than or equal to the second load threshold and less than the third load threshold can be sustained running time (unit: milliseconds);

[0068] the final current control torque is:

[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, when the engine load rate is greater than or equal to the third load threshold , it is judged that the current engine load is high, and the engine load high flag is set up;

[0072] In step S402, after the engine load high flag is set up in step S401, the torque limiting function is started, and the initial value of the torque is the original target torque , that is, the initial value of the torque limiting coefficient is 1, and when the torque limiting function is entered, the torque limiting coefficient decreases from 1 at a first rate (in this embodiment, the first rate is 0.01 / 10ms -1 );

[0073] In step S403, when the engine load rate is less than the set load rate , the engine load high flag is cleared, and the torque limiting coefficient is no longer reduced. Assuming that the time elapsed from when the engine load high flag is set up in step S401 to when the engine load high flag is cleared in step S403 is (unit: milliseconds), the current torque limiting coefficient is:

[0074]

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

[0076]

[0077] In step S404, due to the rapid decrease of the torque limiting coefficient in step S402, the torque decreases rapidly, and thus the engine load rate also decreases rapidly (less than ). In order to ensure the stable output of power, if the engine load rate is less than , the torque limiting coefficient is increased from According to the second rate (the second rate is 0.01 / 500ms in this embodiment) -1 Slowly increase until the engine load rate reaches the first load threshold The torque limiting coefficient no longer increases, assuming that the torque limiting coefficient is increased to the time taken for the engine load rate to reach the first load threshold The current torque limiting coefficient is:

[0078]

[0079] The current control torque is:

[0080]

[0081] It should be noted that during the process of slowly increasing the torque limiting coefficient, if the torque limiting coefficient is greater than or equal to 1 when the engine load rate has not reached the first load threshold , the current torque limiting coefficient is 1.

[0082] In step S405, the torque limiting coefficient from step S404 is used to limit the torque to ensure that the range extender works stably until the range extender changes the working condition and no longer limits the torque.

[0083] It should be noted that the value range of the torque limiting coefficient in this application is 0-1.

[0084] Embodiment 2: The 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 used to operate according to the instructions to perform the steps according to the method.

[0087] Embodiment 3: As shown in Figure 3 , the application provides a range extender torque limiting control system, including the range extender controller of embodiment 2, the range extender controller including 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 perform the steps of the following range extender torque limiting control method.

[0088] ​​In some embodiments, the range extender torque limiting control system further comprises an engine controller ECU, a generator controller GCU, a vehicle controller VCU, a BMS, a display screen, etc. Among them, the range extender controller RCU is used to manage the running state of the range extender, and controls the ECU and the GCU to perform corresponding responses according to the VCU instructions. In the embodiment of the application, the engine controller ECU monitors the engine load rate in real time, sends the engine load rate to the range extender controller RCU through the CAN network, and the RCU processes the target torque of the generator according to the engine load rate signal, and sends the processed torque to the generator controller GCU through the CAN network, and the generator controller GCU feeds back the real-time torque to the RCU.

[0089] Embodiment 4: The embodiment of the application provides an engineering machine configured with the range extender controller or the range extender torque limiting control system.

[0090] In summary, in the application, when the engineering machine is in a working mode, a tire state parameter is obtained, wherein the tire state parameter includes a tire pressure and a tire temperature, and a pressure change value of each tire per unit time; the tire state parameter is input into a tire abnormality identification model to obtain a tire abnormality identification result; wherein the tire abnormality identification model stores a corresponding relationship between the tire temperature, the pressure change value of each tire per unit time, and the pressure of each tire under various working conditions; and the action of an actuator is controlled according to the tire abnormality identification result. If the tire is abnormal and is a medium-grade abnormality, the actuator action speed is reduced; if the tire is abnormal and is a serious-grade abnormality, the actuator action is controlled to stop, and a bulldozer blade and / or a support leg is controlled to support the ground. (1) By importing abnormal mode identification data, the abnormal working state of the engineering machine is effectively identified, the identified abnormal working state is alarmed, the alarm information is uploaded to a data platform, and if necessary, the whole machine action of the engineering machine is limited, thereby effectively protecting the engineering machine. (2) By uploading the big data to the data platform, the working condition characteristics and use habits of the whole machine are analyzed, thereby effectively supporting the health management of the whole machine.

[0091] Those skilled in the art will understand that the embodiments of the application can be provided as a method, a system, or a computer program product. Therefore, the application can take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware aspects. Moreover, the application can take the form of a computer program product implemented on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROMs, optical storage, etc.) containing computer-usable program code.

[0092] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks. Figure 1 one or more flow or blocks.

[0093] These computer program instructions can also be stored in a computer readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer readable memory produce an article of manufacture including instructions which implement the function specified in the flowchart block or blocks. Figure 1 one or more flow or blocks. Figure 1 one or more flow or blocks.

[0094] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart block or blocks. Figure 1 one or more flow or blocks. Figure 1 one or more flow or blocks.

[0095] The above only describes the preferred embodiments of the present application, and it should be pointed out that: for the ordinary skilled in the art, the technical personnel of the industry should understand that the present application without departing from the principles and spirit of the case, there will be various changes and improvements, these improvements should be regarded as the protection scope of the present application, and not limited by the above examples.

Claims

1. A torque limiting control method of a range extender, characterized by, The method comprises the following steps: determining a first load threshold, a second load threshold and a third load threshold of the engine according to the altitude and the engine coolant temperature; wherein the first load threshold < the second load threshold < the third load threshold; and the first load threshold, the second load threshold and the third load threshold are all greater than the maximum sustainable load provided by the engine; acquiring the engine load rate of the range extender in real time according to a set sampling interval, comparing the engine load rate with the first load threshold, the second load threshold and the third load threshold to obtain a comparison result; limiting the target torque according to the comparison result.

2. The range extender torque limitation control method according to claim 1, characterized by, The step of limiting the target torque according to the comparison result comprises the following steps: 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 by a fixed value; wherein the first running time is the continuous running time when 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 is linearly reduced by the proportion by which the engine load rate exceeds, to limit the target torque; wherein the proportion by which the engine load rate exceeds is: the difference between the engine load rate and the first load threshold, the third load threshold and the first load threshold . The ratio of the difference between the second load threshold and the first load threshold . ; wherein the second running time is the duration during which 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 linearly decreases at a first rate to limit the target torque until the engine load rate is less than a set load rate, then the torque limiting coefficient linearly increases at a second rate to the first load threshold, and then the current torque limiting coefficient is kept to limit the target torque; wherein the first rate is greater than the second rate.

3. The range extender torque limitation control method according to claim 2, characterized by, The fixed value is 0.9-0.95; And / or, set the load factor to ; and / or the first rate is 0.01-0.05 / 10 ms -1 ; and / or the second rate is 0.01-0.05 / 500ms -1 .

4. 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 linearly decreases at a first rate to limit the target torque until the engine load rate is less than a set load rate, then the torque limiting coefficient linearly increases at a second rate to the first load threshold, and then the current torque limiting coefficient is kept to limit the target torque, comprising the following steps: in response to the engine load factor being greater than or equal to a third load threshold , an engine load high flag is set, and the torque limiting function is started, the torque limiting coefficient is decreased from 1 at a first rate , until the engine load factor is less than a set load factor, the engine load high flag is cleared, and the torque limiting coefficient is no longer decreased; the time elapsed from the setting of the engine load high flag to the clearing of the engine load high flag is , in milliseconds, and the current torque limiting coefficient is: ; the current control torque is: ; is 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.

5. The range extender torque limitation control method according to claim 4, 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 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​ 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.

6. The range extender torque limitation control method according to claim 2, characterized by, 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 by a fixed value, comprising the following steps: 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 , the torque is not limited, the torque limiting coefficient is equal to 1, and the control torque is the target torque ; the starting time when the engine load rate is greater than the first load threshold for the first time is taken as the starting point of the first running time, and the timing is started; during the first running time, the engine load rate is always greater than the first load threshold ; If the engine load factor is greater than a first load threshold and less than a second load threshold and the operating time exceeds a first time threshold T a then the torque limiting factor is a fixed value and the current control torque is: ； In the formula, Target torque.

7. The range extender torque limitation control method according to claim 2, 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 running time exceeds the second time threshold, the torque limiting coefficient linearly decreases by the proportion that the engine load rate exceeds to limit the target torque, comprising the following steps: when the engine load factor is greater than or equal to a second load threshold and less than a third load threshold if a second operation time does not exceed a second time threshold T b , the torque is not limited; the starting time when the engine load factor is first greater than or equal to the second load threshold is taken as the starting point of the second operation time, and the timing is started; and the engine load factor is always equal to the second load threshold during the second operation time; if the engine load factor is greater than or equal to a second load threshold and less than a third load threshold and the second operating time exceeds a second time threshold T b the torque limiting factor is: ； Current control torque Is: ; Target torque.

8. A range extender controller, characterized in that, The system comprises 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 perform the steps of the method according to any one of claims 1 to 7.

9. An overrunning device torque limiting control system characterized by, The range extender controller of claim 8.

10. A working machine, characterized in that The range extender torque limiting control system of claim 9. The range extender torque limiting control system of claim 9.

Images