Range extender shutdown control method and device, electronic equipment and storage medium

Abstract

The invention provides a range extender shutdown control method and device, electronic equipment and a storage medium. The method comprises the steps that when an engine of the range extender has a shutdown requirement, whether the current environment temperature is lower than the preset environment temperature or not is judged firstly; when the current environment temperature is lower than the preset environment temperature, and the output torque of a generator of the range extender is negative torque, the engine is controlled to cut off oil; after fuel cut-off of the engine, the rotating speed of the generator is controlled to be the target rotating speed, and the current rotating speed of the engine is reduced to the target rotating speed; and finally, when the rotating speed of the engine is the target rotating speed, controlling the output torque of the generator to stop the engine. It can be understood that when the output torque of the generator is negative torque, gear collision noise between the engine and the generator can be effectively reduced by controlling fuel cut-off of the engine; the rotating speed of the engine is reduced to the target rotating speed through rotating speed control, then the engine is stopped through torque control, and stopping noise of internal devices of the range extender can be effectively reduced.

Description

Technical Field

[0001] This application relates to the field of engine technology, and more specifically to a range extender shutdown control method, device, electronic equipment, and storage medium. Background Technology

[0002] A range extender is typically a power device consisting of an engine and a generator, allowing the engine and electric motor to complement each other's shortcomings, thereby improving the overall operating efficiency of the vehicle. In practical applications, the generator and engine in a range extender are usually rigidly connected via a gear shaft.

[0003] In existing technology, when the engine in the range extender needs to be stopped, the engine fuel is first cut off; then the generator outputs reverse torque to hinder the operation of the engine in the range extender, thereby accelerating the rate at which the engine speed in the range extender decreases, and finally causing the engine in the range extender to stop quickly.

[0004] However, when the ambient temperature is low, the engine oil and coolant temperatures are also low. If the engine cuts off the fuel supply directly, or the generator directly shuts down the engine, the range extender will generate significant shutdown noise.

[0005] It should be noted that the information disclosed in the background section of this application is intended only to enhance the understanding of the general background of this application, and should not be construed as an admission or in any way implying that the information constitutes prior art known to those skilled in the art. Summary of the Invention

[0006] In view of this, this application provides a range extender shutdown control method, device, electronic device and storage medium to solve the problem in the prior art that when the ambient temperature is low, the engine directly cuts off the fuel or the generator directly controls the engine to stop, which causes the range extender to generate large shutdown noise.

[0007] In a first aspect, embodiments of this application provide a range extender shutdown control method, wherein the range extender includes a generator and an engine, the generator and the engine being connected via a gear shaft, the method comprising:

[0008] When the engine of the range extender needs to be shut down, it is determined whether the current ambient temperature is lower than the preset ambient temperature.

[0009] When the current ambient temperature is lower than the preset ambient temperature and the output torque of the generator of the range extender is negative, the fuel supply of the engine of the range extender is cut off. The negative torque of the generator represents the torque of the generator that hinders the movement of the engine, and the absolute value of the negative torque of the generator is greater than the absolute value of the torque corresponding to the deceleration of the engine.

[0010] Control the speed of the generator so that the engine speed decreases from the current speed to the target speed;

[0011] When the engine speed reaches the target speed, the output torque of the generator is controlled to stop the engine.

[0012] In this embodiment, when the range extender's engine needs to shut down, the system first determines whether the current ambient temperature is lower than a preset ambient temperature. If the current ambient temperature is lower than the preset ambient temperature and the range extender's generator output torque is negative, the system controls the engine to cut off fuel. After the engine fuel is cut off, the generator speed is controlled to a target speed, causing the engine to decrease from its current speed to the target speed. Finally, when the engine speed reaches the target speed, the generator output torque is controlled to stop the engine. It can be understood that controlling the engine fuel cut-off when the generator output torque is negative can effectively reduce gear collision noise between the engine and generator; first, speed control is used to reduce the engine speed to the target speed, and then torque control is used to stop the engine, which can effectively reduce shutdown noise of the internal components of the range extender.

[0013] In one possible implementation, controlling the fuel cut-off of the engine in the range extender when the current ambient temperature is lower than a preset temperature and the output torque of the generator in the range extender is negative torque includes:

[0014] When the current ambient temperature is lower than the preset ambient temperature, the engine oil temperature is lower than the preset engine oil temperature, and the output torque of the generator of the range extender is negative torque, the engine oil of the range extender is cut off.

[0015] In this embodiment, when the current ambient temperature is lower than the preset ambient temperature, the engine oil temperature is lower than the preset engine oil temperature, and the output torque of the generator of the range extender is negative, the engine fuel cut-off of the range extender is controlled. It can be understood that by adding the judgment of engine oil temperature, the engine fuel cut-off time can be determined more accurately, thereby effectively reducing gear collision noise between the engine and the generator.

[0016] In one possible implementation, after controlling the fuel cut-off of the engine of the range extender when the current ambient temperature is lower than the preset ambient temperature and the output torque of the generator of the range extender is negative, the method further includes:

[0017] Determine whether the current speed of the engine is greater than or equal to the preset engine speed;

[0018] When the current speed of the engine is greater than or equal to the preset speed of the engine, the throttle valve of the engine is opened.

[0019] When the current speed of the engine is less than the preset speed of the engine, the throttle valve of the engine is closed.

[0020] In this embodiment, the method further includes: determining whether the current engine speed is greater than or equal to a preset engine speed; when the current engine speed is greater than or equal to the preset engine speed, controlling the opening of the engine throttle valve; and when the current engine speed is less than the preset engine speed, controlling the closing of the engine throttle valve. It is understood that selecting to open or close the engine throttle valve based on the current engine speed can effectively ensure the airflow velocity in the engine, thereby ensuring the stability of engine rotation and effectively reducing shutdown noise from internal components of the range extender.

[0021] In one possible implementation, controlling the throttle valve of the engine to close when the current engine speed is less than the preset engine speed includes:

[0022] When the current engine speed is less than the preset engine speed, the throttle opening of the engine is adjusted according to the current engine speed, and the throttle opening is proportional to the current engine speed.

[0023] In this embodiment, when the current engine speed is less than the preset engine speed, the throttle opening of the engine is adjusted according to the current engine speed, so that the engine at low speed maintains greater resistance, avoids the engine speed swing at the end of the shutdown, thereby ensuring the stability of engine rotation and effectively reducing the shutdown noise of the internal components of the range extender.

[0024] In one possible implementation, adjusting the throttle opening of the engine based on the current engine speed includes:

[0025] The throttle opening of the engine is adjusted based on the current engine speed and the relationship between engine speed and throttle opening.

[0026] In this embodiment, based on the current engine speed and the correspondence between engine speed and throttle opening, the engine throttle opening can be adjusted more quickly and conveniently, thereby ensuring the stability of engine rotation and effectively reducing the shutdown noise of internal components of the range extender.

[0027] In one possible implementation, the output torque of the generator is less than or equal to the maximum generating torque of the generator, and the generating power produced by the output torque of the generator is less than or equal to the maximum charging power of the corresponding charging pack.

[0028] In this embodiment, controlling the generator's output torque to be less than or equal to the generator's maximum generating torque, and ensuring that the generator's output torque generates power less than or equal to the corresponding charging pack's maximum charging power, can ensure the generator's normal operation, thereby enabling the engine to shut down and reducing shutdown noise of the range extender's internal components.

[0029] In one possible implementation, controlling the output torque of the generator to stop the engine when the engine speed is the target speed includes:

[0030] When the engine speed is the target speed, the output torque of the generator is controlled according to the current ambient temperature and the correspondence between ambient temperature and output torque, so that the engine stops.

[0031] In this embodiment, when the engine speed is the target speed, the generator output torque can be controlled more precisely based on the current ambient temperature and the relationship between engine speed, ambient temperature and output torque, so that the engine stops, thereby effectively reducing the shutdown noise of the internal components of the range extender.

[0032] Secondly, embodiments of this application provide a range extender shutdown control device, comprising:

[0033] The judgment module is used to determine whether the current ambient temperature is lower than the preset ambient temperature when the engine of the range extender has a shutdown requirement;

[0034] An engine fuel cut-off control module is used to control the engine fuel cut-off of the range extender when the current ambient temperature is lower than the preset ambient temperature and the output torque of the generator of the range extender is negative torque. The negative torque of the generator represents the torque of the generator that hinders the movement of the engine, and the absolute value of the negative torque of the generator is greater than the absolute value of the torque corresponding to the deceleration of the engine.

[0035] A generator speed control module is used to control the speed of the generator, so that the engine speed is reduced from the current speed to the target speed;

[0036] The generator output torque control module is used to control the output torque of the generator when the engine speed is the target speed, so that the engine stops.

[0037] Thirdly, embodiments of this application provide an electronic device, characterized in that it includes:

[0038] processor;

[0039] Memory;

[0040] And a computer program, wherein the computer program is stored in the memory, the computer program including instructions that, when executed by the processor, cause the electronic device to perform the method described in any one of the first aspects.

[0041] Fourthly, embodiments of this application provide a computer-readable storage medium, characterized in that the computer-readable storage medium includes a stored program, wherein, when the program is executed, it controls the device where the computer-readable storage medium is located to perform the method described in any one of the first aspects.

[0042] Understandably, the range extender shutdown control device provided in the second aspect, the electronic device provided in the third aspect, and the computer-readable storage medium provided in the fourth aspect are all used to execute the method provided in this application. Therefore, the beneficial effects they can achieve can be referred to the beneficial effects in the corresponding methods, and will not be repeated here. Attached Figure Description

[0043] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the embodiments 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.

[0044] Figure 1 This is a schematic diagram illustrating an application scenario provided by an embodiment of this application.

[0045] Figure 2 A schematic diagram of gear engagement between an engine and a generator, provided for related technologies.

[0046] Figure 3 This is a flowchart illustrating a range extender shutdown control method provided in an embodiment of this application.

[0047] Figure 4 This is a schematic diagram of the structure of a range extender shutdown control device provided in an embodiment of this application.

[0048] Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. Detailed Implementation

[0049] To better understand the technical solution of this application, the embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0050] It should be understood that the described embodiments are merely some, not all, of the embodiments in this application. All other embodiments obtained by those skilled in the art based on the embodiments in this application without inventive effort are within the scope of protection of this application.

[0051] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise.

[0052] It should be understood that the term "and / or" used in this article is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this article generally indicates that the preceding and following related objects have an "or" relationship.

[0053] A range extender is typically a power device consisting of an engine and a generator, allowing the engine and electric motor to complement each other's shortcomings, thereby improving the overall operating efficiency of the vehicle. In practical applications, the generator and engine in a range extender are usually rigidly connected via a gear shaft.

[0054] For ease of understanding, see Figure 1 This is a schematic diagram illustrating an application scenario provided by an embodiment of this application. For example... Figure 1 As shown in the figure, the range extender 101, fuel tank 102, battery pack 103, frequency converter 104, electric motor 105, and wheels 106 are illustrated. The range extender 101 includes a generator 1011, a transmission device 1012, and an engine 1013.

[0055] Specifically, the battery pack 103 is used to provide power to the electric motor 105; the electric motor 105 can drive the wheel 106 to rotate through the transmission device; the fuel tank 102 is used to provide fuel to the engine 1013; the engine 1013 drives the generator 1011 to generate electricity through the transmission device 1012, thereby providing power to the battery pack 103 or the electric motor 105.

[0056] In existing technology, when the engine in the range extender needs to be stopped, the engine fuel is first cut off; then the generator outputs reverse torque to hinder the operation of the engine in the range extender, thereby accelerating the rate at which the engine speed in the range extender decreases, and finally causing the engine in the range extender to stop quickly.

[0057] However, when the ambient temperature is low, the engine oil and coolant temperatures are also low. If the engine cuts off the fuel supply directly, or the generator directly shuts down the engine, the range extender will generate significant shutdown noise.

[0058] It is understandable that the shutdown noise generated by the range extender includes various types of noise, such as gear collision noise and internal piston noise from the engine. Among them, gear collision noise refers to the noise generated by the collision of gears between the engines.

[0059] For a better understanding of gear noise, see [link to relevant documentation]. Figure 2 This diagram illustrates a gear engagement between an engine and a generator, providing insights into related technologies. The diagram shows two different gear engagement configurations for the engine and generator. When the engine torque is positive and the generator torque is negative, the engine drives the generator to rotate, and the gear relationship between the engine and generator is as follows: Figure 2 As shown in Figure (a); then, when the engine stops and its torque becomes negative, and the generator's output torque is positive, the gear relationship between the engine and generator is as follows. Figure 2 As shown in Figure (b); when the gear relationship between the engine and the generator is as follows... Figure 2 When switching back and forth between diagrams (a) and (b), the gears between the generator and the engine collide, generating gear collision noise.

[0060] To address the aforementioned issues, in this embodiment, when the range extender's engine requires shutdown, the system first determines whether the current ambient temperature is lower than a preset ambient temperature. If the current ambient temperature is lower than the preset ambient temperature and the range extender's generator output torque is negative, the system controls the engine to cut off fuel. After fuel cut-off, the generator speed is controlled to a target speed, causing the engine to decrease from its current speed to the target speed. Finally, when the engine speed reaches the target speed, the generator output torque is controlled to shut down the engine. It can be understood that controlling the engine to cut off fuel when the generator output torque is negative can effectively reduce gear collision noise between the engine and generator. First, using speed control to reduce the engine speed to the target speed, and then using torque control to shut down the engine, can effectively reduce shutdown noise of the internal components of the range extender. Specifically, this will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0061] See Figure 3 This is a flowchart illustrating a range extender shutdown control method provided in an embodiment of this application. This method can be applied to... Figure 1 In the application scenarios shown, such as Figure 3 As shown, it mainly includes the following steps.

[0062] Step S301: When the range extender's engine needs to be shut down, determine whether the current ambient temperature is lower than the preset ambient temperature.

[0063] In this embodiment of the application, when it is detected that the engine of the range extender has a shutdown requirement, the current ambient temperature is first obtained; then, it is determined whether the current ambient temperature is lower than the preset ambient temperature.

[0064] For example, the preset ambient temperature is 0 degrees Celsius. When the current ambient temperature is 5 degrees Celsius, since 5 degrees Celsius > 0 degrees Celsius, that is, the current ambient temperature is greater than the preset ambient temperature, the range extender does not shut down under extremely cold conditions. Therefore, the conventional shutdown method can be used to control the range extender to shut down. When the current ambient temperature is -5 degrees Celsius, since -5 degrees Celsius < 0 degrees Celsius, that is, the current ambient temperature is less than the preset ambient temperature, the range extender shuts down under extremely cold conditions. In this case, the shutdown method of steps S302-S304 is used to control the range extender to shut down.

[0065] Step S302: When the current ambient temperature is lower than the preset ambient temperature and the output torque of the generator of the range extender is negative, control the engine fuel cut-off of the range extender.

[0066] In this embodiment, when the current ambient temperature is lower than a preset ambient temperature and the output torque of the range extender's generator is negative, the range extender's engine fuel is cut off. Here, the negative torque of the generator represents the torque that hinders engine movement, and the absolute value of the generator's negative torque is greater than the absolute value of the torque corresponding to the engine's deceleration.

[0067] Understandably, once the range extender meets the shutdown requirements, it first controls the engine's output torque to zero (the engine is still running, but the work done against its own resistance is zero), meaning the engine's output power is zero, and the range extender's engine idles at this time. Since different ambient temperatures affect the coolant temperature of the range extender's engine, which in turn affects the viscosity of the engine oil, different coolant temperatures correspond to different engine idle speeds.

[0068] For example, Table 1 shows the operating idle speeds corresponding to different engine coolant temperatures.

[0069] Table 1:

[0070] Coolant temperature -40℃ -35℃ -30℃ -25℃ -20℃ -15℃ -10℃ 0℃ Idle speed 1700rpm 1600rpm 1500rpm 1400rpm 1300rpm 1200rpm 1100rpm 1000rpm

[0071] In practical applications, the first step is to control the engine fuel cut-off. Since the engine, oil, and coolant temperatures are all low at this time, the engine is overcoming internal resistance before fuel cut-off. After fuel cut-off, the engine's internal resistance increases, and directly cutting off fuel at this point would cause significant shutdown noise from the range extender. To address this shutdown noise, the internal components of the engine and generator should be meshed and subjected to force. Specifically, the generator is controlled by speed control, and the engine speed is reduced to a fixed speed based on the different coolant temperatures described in Table 1. During this process of reducing the engine speed, there is a period where the generator outputs maximum torque to impede engine rotation. Fuel cut-off is applied during this period. At this time, the gears of the engine and generator remain in a forward meshing state, eliminating gear collision noise caused by gear collision between the generator and engine at the moment of fuel cut-off.

[0072] For example, the fixed speed is 100 rpm. When the engine coolant temperature is -25℃, according to Table 1, the engine's idle speed is 1400 rpm. At this time, the motor control is speed control, controlling the engine speed to 1300 rpm. During the process of controlling the engine to reduce to 1300 rpm, there is a period when the generator outputs maximum torque to hinder engine rotation. During the period when the generator outputs maximum torque, the engine fuel is cut off. At this time, the gears of the engine and generator are still in a forward meshing state, which can eliminate the collision of gears between the generator and engine at the moment of fuel cut-off, thus eliminating gear collision noise.

[0073] In the above process, in order to ensure the normal shutdown of the engine, the absolute value of the generator's output torque is greater than the absolute value of the torque corresponding to the engine's deceleration, thereby ensuring that the generator can reduce the engine speed.

[0074] Referring to Table 2, this application provides a correlation between engine deceleration and coolant temperature in an embodiment. The engine deceleration can then be determined based on the coolant temperature, ultimately ensuring that the absolute value of the generator's output torque is greater than the absolute value of the torque corresponding to the engine deceleration.

[0075] Table 2:

[0076]

[0077] In one possible implementation, when the current ambient temperature is lower than a preset ambient temperature, the engine oil temperature is lower than a preset engine oil temperature, and the generator output torque of the range extender is negative, the engine fuel cut-off of the range extender is controlled. It is understood that by adding the judgment of engine oil temperature, the engine fuel cut-off time can be determined more accurately, thereby effectively reducing gear collision noise between the engine and the generator.

[0078] In practical applications, after the engine completes fuel cut-off, in order to control the stability of the internal airflow pressure of the engine and increase the smoothness of shutdown, it is necessary to control the opening of the engine intake throttle valve, thereby ensuring the stability of engine rotation and effectively reducing the shutdown noise of the internal components of the range extender.

[0079] Specifically, in one possible implementation, after the engine completes the fuel cut-off, it is determined whether the current engine speed is greater than or equal to the preset engine speed; if the current engine speed is greater than or equal to the preset engine speed, the engine throttle valve is opened; if the current engine speed is less than the preset engine speed, the engine throttle valve is closed.

[0080] Understandably, selecting to open or close the engine throttle valve based on the engine's current speed can effectively ensure the airflow rate in the engine, thereby ensuring the stability of engine rotation and effectively reducing the shutdown noise of the internal components of the range extender.

[0081] Furthermore, in one possible implementation, in this embodiment of the application, when the current engine speed is less than the preset engine speed, the throttle opening of the engine is adjusted according to the current engine speed, so that the engine at low speed maintains greater resistance, avoids the engine speed swing at the end of the shutdown, thereby ensuring the stability of engine rotation and effectively reducing the shutdown noise of the internal components of the range extender.

[0082] Specifically, in one possible implementation, based on the current engine speed and the correspondence between engine speed and throttle opening, the engine throttle opening can be adjusted more quickly and conveniently, thereby ensuring the stability of engine rotation and effectively reducing the shutdown noise of internal components of the range extender.

[0083] For example, the correspondence between engine speed and throttle opening is shown in Table 3. When the engine speed is 1000 rpm, based on the current engine speed and the correspondence between engine speed and throttle opening, the engine throttle opening can be determined to be 50%. Similarly, when the engine speed is 900 rpm, based on the current engine speed and the correspondence between engine speed and throttle opening, the engine throttle opening can be determined to be 35%. When the engine speed is 800 rpm, based on the current engine speed and the correspondence between engine speed and throttle opening, the engine throttle opening can be determined to be 35%.

[0084] Table 3:

[0085] Engine speed 1500rpm 1200rpm 1000rpm 800rpm 600rpm 400rpm 200rpm 0 Throttle opening 100％ 70％ 50％ 35％ 20％ 10％ 5％ 0

[0086] In this embodiment, when the engine speed is high, in order to ensure the stability of engine rotation, the throttle needs to be opened to increase the airflow velocity and reduce the internal resistance of engine airflow; when the engine speed gradually decreases, the internal resistance of the engine needs to be increased to keep the low-speed engine with greater resistance and avoid the speed swing at the end of the shutdown period.

[0087] Step S303: Control the generator speed so that the engine speed decreases from the current speed to the target speed.

[0088] In this embodiment, after the engine fuel is cut off, in order to quickly shut down the engine of the range extender, the engine speed is first reduced rapidly through speed control. Simultaneously, since the generator's output torque is prone to fluctuations when the generator speed is low, this may cause shutdown noise from the internal components of the range extender; therefore, when the engine speed is low, the engine is shut down by outputting a fixed torque from the generator.

[0089] It is understandable that the target speed is the speed at which the generator's output torque is prone to fluctuation.

[0090] In this embodiment of the application, when the engine fuel is cut off, the generator speed is first controlled to the target speed, so that the engine speed is reduced from the current speed to the target speed.

[0091] For example, the target speed is 600 rpm. When the engine fuel is cut off, the generator speed is controlled first to reduce the engine speed from its current speed to 600 rpm.

[0092] Step S304: When the engine speed is at the target speed, control the output torque of the generator to stop the engine.

[0093] In this embodiment of the application, when the engine speed is at the target speed, the output torque of the generator is controlled to stop the engine.

[0094] In one possible implementation, the generator's output torque is less than or equal to the generator's maximum generating torque, and the power generated by the generator's output torque is less than or equal to the maximum charging power of the corresponding charging pack.

[0095] In this embodiment, controlling the generator's output torque to be less than or equal to the generator's maximum generating torque, and ensuring that the generator's output torque generates power less than or equal to the corresponding charging pack's maximum charging power, can ensure the generator's normal operation, thereby enabling the engine to shut down and reducing shutdown noise of the range extender's internal components.

[0096] It is understandable that when the engine speed is high, a large negative torque is applied to the engine; as the engine speed gradually decreases, the generator needs to reduce the value of the negative torque. When the engine speed approaches the shutdown speed, the generator should be controlled only to the gear torque, and finally the engine will shut down.

[0097] In one possible implementation, when the engine speed is the target speed, the generator output torque is controlled according to the current ambient temperature and the correspondence between ambient temperature and output torque, so that the engine stops.

[0098] For example, Table 4 shows the correspondence between engine speed, ambient temperature, and output torque provided in this application. When the current speed is 500 rpm and the current ambient temperature is -50℃, the generator output torque is controlled to be 20 N·m, causing the engine to stop; similarly, when the current speed is 400 rpm and the current ambient temperature is -50℃, the generator output torque is controlled to be 15 N·m, causing the engine to stop; similarly, when the current speed is 500 rpm and the current ambient temperature is -55℃, the generator output torque is controlled to be 20 N·m, causing the engine to stop.

[0099] Table 4:

[0100] Temperature / Speed 10rpm 50rpm 100rpm 300rpm 500rpm 800rpm -60℃ 0 0 4N·m 14 N·m 19 N·m 19 N·m -50℃ 0 0 5 N·m 15 N·m 20 N·m 20 N·m -40℃ 0 0 6 N·m 16 N·m 21 N·m 21 N·m -30℃ 0 0 7 N·m 17 N·m 22 N·m 22 N·m -20℃ 0 1N·m 8 N·m 18 N·m 23 N·m 23 N·m -10℃ 1N·m 2N·m 9 N·m 19 N·m 24 N·m 24 N·m 0℃ 2N·m 3N·m 10 N·m 20 N·m 25 N·m 25 N·m 20℃ 2N·m 3N·m 11 N·m 21 N·m 26 N·m 26 N·m 40℃ 2N·m 3N·m 12 N·m 22 N·m 27 N·m 27 N·m 60℃ 3N·m 4N·m 13 N·m 23 N·m 28 N·m 28 N·m

[0101] In this embodiment, when the engine speed is the target speed, the generator output torque can be controlled more precisely based on the current ambient temperature and the relationship between engine speed, ambient temperature and output torque, so that the engine stops, thereby effectively reducing the shutdown noise of the internal components of the range extender.

[0102] In this embodiment, when the range extender's engine needs to shut down, the system first determines whether the current ambient temperature is lower than a preset ambient temperature. If the current ambient temperature is lower than the preset ambient temperature and the range extender's generator output torque is negative, the system controls the engine to cut off fuel. After the engine fuel is cut off, the generator speed is controlled to a target speed, causing the engine to decrease from its current speed to the target speed. Finally, when the engine speed reaches the target speed, the generator output torque is controlled to stop the engine. It can be understood that controlling the engine fuel cut-off when the generator output torque is negative can effectively reduce gear collision noise between the engine and generator; first, speed control is used to reduce the engine speed to the target speed, and then torque control is used to stop the engine, which can effectively reduce shutdown noise of the internal components of the range extender.

[0103] Corresponding to the above embodiments, this application also provides a range extender shutdown control device.

[0104] See Figure 4This is a schematic diagram of a range extender shutdown control device provided in an embodiment of this application. As shown in the figure, the range extender shutdown control device 400 includes: a judgment module 401, an engine fuel cut-off control module 402, a generator speed control module 403, and a generator output torque control module 404. The judgment module is used to determine whether the current ambient temperature is lower than a preset ambient temperature when the range extender's engine needs to shut down. The engine fuel cut-off control module is used to control the range extender's engine fuel cut-off when the current ambient temperature is lower than the preset ambient temperature and the range extender's generator output torque is negative. The generator speed control module is used to control the generator speed, causing the engine to decrease from its current speed to a target speed. The generator output torque control module is used to control the generator output torque when the engine speed is at the target speed, causing the engine to shut down.

[0105] For details regarding the specific content involved in the embodiments of this application, please refer to the description of the above method embodiments. For the sake of brevity, these details will not be repeated here.

[0106] Corresponding to the above embodiments, this application also provides an electronic device. See also Figure 5 This is a schematic diagram of the structure of an electronic device provided in an embodiment of this application. The electronic device 500 may include a processor 501, a memory 502, and a communication unit 503. These components communicate through one or more buses. Those skilled in the art will understand that the structure of the electronic device shown in the figure does not constitute a limitation on the embodiments of the present invention. It may be a bus-shaped structure or a star-shaped structure, and may include more or fewer components than shown, or combine certain components, or have different component arrangements.

[0107] The communication unit 503 is used to establish a communication channel, enabling the electronic device to communicate with other devices. It can receive user data sent by other devices or send user data to other devices.

[0108] The processor 501 serves as the control center of the electronic device, connecting various parts of the device via interfaces and lines. It executes software programs, instructions, and / or modules stored in the memory 502, and calls data stored in the memory to perform various functions and / or process data. The processor may be composed of integrated circuits (ICs), such as a single packaged IC or multiple packaged ICs with the same or different functions connected together. For example, the processor 501 may consist only of a central processing unit (CPU). In this embodiment, the CPU may have a single processing core or include multiple processing cores.

[0109] The memory 502 is used to store the execution instructions of the processor 501. The memory 502 can be implemented by any type of volatile or non-volatile storage device or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic storage, flash memory, magnetic disk or optical disk.

[0110] When the execution instructions in memory 502 are executed by processor 501, the electronic device 500 is able to perform operations. Figure 1 Some or all of the steps in the illustrated embodiments.

[0111] In a specific implementation, the present invention also provides a computer storage medium, wherein the computer storage medium may store a program, and the program, when executed, may include some or all of the steps in the various embodiments of the simulation scene generation method provided by the present invention. The storage medium may be a magnetic disk, optical disk, read-only memory (ROM), or random access memory (RAM), etc.

[0112] In a specific implementation, the present invention also provides a computer program product, wherein the computer program product includes executable instructions, which, when executed on a computer, cause the computer to perform some or all of the steps in various embodiments of the simulation scene generation method provided by the present invention.

[0113] In this application embodiment, "at least one" refers to one or more, and "more than one" refers to two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent the existence of A alone, the simultaneous existence of A and B, or the existence of B alone. A and B can be singular or plural. The character " / " generally indicates that the preceding and following related objects are in an "or" relationship. "At least one of the following" and similar expressions refer to any combination of these items, including any combination of single or plural items. For example, at least one of a, b, and c can represent: a, b, c, ab, ac, bc, or abc, where a, b, and c can be single or multiple.

[0114] Those skilled in the art will recognize that the units and algorithm steps described in the embodiments disclosed herein can be implemented using electronic hardware, computer software, or a combination of electronic hardware and software. 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.

[0115] Those skilled in the art will understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0116] In the several embodiments provided in this application, any function, if implemented as a software functional unit and sold or used as an independent product, can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0117] The same or similar parts between the various embodiments in this specification can be referred to mutually. In particular, the device embodiments and terminal embodiments are basically similar to the method embodiments, so the description is relatively simple, and the relevant parts can be referred to the description in the method embodiments.

Claims

1. A method of controlling shutdown of a booster, characterized by, The booster comprises a generator and an engine, the generator is connected with the engine through a gear shaft, the comprising: When there is a shutdown requirement for the engine of the booster, it is determined whether the current ambient temperature is lower than an ambient preset temperature; When the current ambient temperature is lower than the ambient preset temperature and the output torque of the generator of the booster is a negative torque, the engine of the booster is controlled to be cut off, wherein the negative torque of the generator represents a torque that hinders the movement of the engine, and the absolute value of the negative torque of the generator is greater than the absolute value of the torque corresponding to the deceleration of the engine; The speed of the generator is controlled so that the engine is reduced from the current speed to the target speed; When the speed of the engine is the target speed, the output torque of the generator is controlled so that the engine is shut down.

2. The method of claim 1, wherein, The control of the engine to be cut off when the current ambient temperature is lower than the preset temperature and the output torque of the generator of the booster is a negative torque, comprising: When the current ambient temperature is lower than the ambient preset temperature, the oil temperature is lower than the oil preset temperature, and the output torque of the generator of the booster is a negative torque, the engine of the booster is controlled to be cut off.

3. The method of claim 1, wherein, After the control of the engine to be cut off when the current ambient temperature is lower than the ambient preset temperature and the output torque of the generator of the booster is a negative torque, further comprising: It is determined whether the current speed of the engine is greater than or equal to an engine preset speed; When the current speed of the engine is greater than or equal to the engine preset speed, the throttle of the engine is controlled to be opened; When the current speed of the engine is less than the engine preset speed, the throttle of the engine is controlled to be closed.

4. The method of claim 3, wherein, The control of the throttle of the engine to be closed when the current speed of the engine is less than the engine preset speed, comprising: When the current speed of the engine is less than the engine preset speed, the throttle opening of the engine is adjusted according to the current speed of the engine, and the throttle opening is proportional to the current speed of the engine.

5. The method of claim 4, wherein, The adjustment of the throttle opening of the engine according to the current speed of the engine, comprising: The throttle opening of the engine is adjusted according to the current speed of the engine and the corresponding relationship between the engine speed and the throttle opening.

6. The method of claim 1, wherein, The output torque of the generator is less than or equal to the maximum power generation torque of the generator, and the generated power generated by the output torque of the generator is less than or equal to the maximum charging power of the corresponding charging package.

7. The method of claim 1, wherein, The control of the output torque of the generator to make the engine shut down when the speed of the engine is the target speed, comprising: When the speed of the engine is the target speed, the output torque of the generator is controlled according to the current ambient temperature and the corresponding relationship between the ambient temperature and the output torque, so that the engine is shut down.

8. A booster shutdown control device characterized by comprising: Comprising: A judging module is configured to judge whether a current ambient temperature is lower than an ambient preset temperature when the engine of the range extender has a shutdown demand; An engine fuel cut control module is configured to control the engine of the range extender to cut fuel when the current ambient temperature is lower than the ambient preset temperature and an output torque of the generator of the range extender is a negative torque, wherein the negative torque of the generator represents a torque that hinders the movement of the engine, and an absolute value of the negative torque of the generator is greater than an absolute value of a torque corresponding to a deceleration of the engine; A generator rotating speed control module is configured to control the rotating speed of the generator so that the engine is reduced from a current rotating speed to the target rotating speed; A generator output torque control module is configured to control the output torque of the generator when the rotating speed of the engine is the target rotating speed so that the engine is shut down.

9. An electronic device, comprising: comprise: a processor; a memory; and a computer program, wherein the computer program is stored in the memory, and the computer program comprises instructions which, when executed on the processor, cause the electronic device to perform the method of any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that, The computer readable storage medium comprises a stored program, wherein the program controls the device where the computer readable storage medium is located to perform the method of any one of claims 1 to 7 when the program is running.

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