The application discloses a control method, device and equipment for a range-extending power system and a storage medium.

Abstract

A control method, device and equipment for a range extending power system and a storage medium. The method comprises: when the sum of a feedback braking demand power and a power generation power of a generator in the range extending power system is greater than a battery allowable charging power, reducing the power generation power to a preset value; in the process of reducing the power generation power, determining a target change rate according to actual engine parameters of an engine in the range extending power system and a preset corresponding relationship according to a preset period, and adjusting the engine speed according to the target change rate until the engine speed reaches an idle speed, the preset corresponding relationship comprising a corresponding relationship between the engine parameters and the change rate when the engine NVH characteristic parameters are in a suitable interval. By reducing the power generation power, more power can be fed back to the braking, thereby ensuring the braking performance; and in the process of reducing the power generation power, the engine NVH characteristic parameters are ensured to be in the suitable interval, the engine flywheel is avoided, and the ride experience is improved.

Description

Technical Field

[0001] The present application relates to the field of vehicle control technology, and in particular to a control method, device, equipment and computer-readable storage medium for an extended-range power system. Background Art

[0002] When a vehicle equipped with an extended-range powertrain brakes, in addition to the braking force applied by the hydraulic braking system, the regenerative braking of the drive motor also provides a portion of the braking force, thereby improving braking performance. The greater the regenerative braking power, the greater the braking force provided by the regenerative braking. However, the battery management system (BMS) sets the maximum allowable charging current under different temperatures and different SOC (State of Charge) conditions based on the need to protect the battery. This current multiplied by the current power battery voltage is equal to the maximum allowable charging power Pc of the battery in the current state, and requires that the regenerative braking power Pz + the generator power generation power Pw ≤ Pc.

[0003] It can be seen that when regenerative braking is required to participate in braking, if the generator in the extended-range power system is still generating electricity at high power, this will result in limited braking capacity that can be allocated to the drive motor, making it impossible to effectively recover braking energy and greatly reducing braking performance.

[0004] To prevent battery overcharging and maximize braking performance, the conventional approach is to shut down the generator, reducing Pw to zero and allowing Pc to serve as regenerative braking power. However, because engine torque decreases more slowly than that of the generator, shutting down the generator during high-power generation can result in the engine still delivering high torque even when the generator torque drops to zero, causing the engine to run wild, resulting in significant noise and vibration. Summary of the Invention

[0005] The present application provides a control method, device, equipment and computer-readable storage medium for an extended-range power system, which can solve the technical problem in the prior art that the solution of controlling the generator shutdown to improve braking performance will affect the riding experience.

[0006] In a first aspect, an embodiment of the present application provides a control method for an extended-range power system, the control method for the extended-range power system comprising:

[0007] When the sum of the regenerative braking demand power and the power generated by the generator in the range-extended power system is greater than the battery's allowable charging power, reducing the power generated to a preset value;

[0008] In the process of reducing the generated power, the target change rate is determined according to the actual engine parameters of the engine in the extended-range power system and the preset correspondence according to the preset cycle, and the engine speed is adjusted according to the target change rate until the engine speed reaches the idle speed, wherein the preset correspondence includes the correspondence between the engine parameters and the change rate when the engine NVH characteristic parameters are in an appropriate range.

[0009] In combination with the first aspect, in one implementation, the preset value is zero.

[0010] In combination with the first aspect, in one embodiment, reducing the generated power to a preset value includes:

[0011] The control mode of the generator is switched from speed control to torque control, and the torque of the generator is reduced to zero.

[0012] In conjunction with the first aspect, in one embodiment, before determining the target change rate according to the actual engine parameters of the engine in the range-extended power system and the preset corresponding relationship at a preset period and adjusting the engine speed according to the target change rate until the engine speed reaches the idle speed, the method further includes:

[0013] The control mode of the engine is switched from torque control to speed control.

[0014] In conjunction with the first aspect, in one embodiment, determining the target change rate according to actual engine parameters of the engine in the extended-range power system and a preset corresponding relationship includes:

[0015] Detecting whether there are engine parameters in the preset correspondence that are consistent with actual engine parameters of the engine in the extended-range power system;

[0016] When there is no engine parameter consistent with the actual engine parameter in the preset corresponding relationship, determining two engine parameters closest to the actual engine parameter from the preset corresponding relationship;

[0017] constructing a linear equation based on the two closest engine parameters and their corresponding rates of change;

[0018] The actual engine parameters are substituted into the linear equation and the target change rate is obtained by solving the equation.

[0019] In a second aspect, an embodiment of the present application provides a control device for an extended-range power system, the control device for the extended-range power system comprising a vehicle controller, a generator controller, and an engine controller, wherein:

[0020] When the sum of the regenerative braking demand power and the power generated by the generator in the range-extended power system is greater than the battery's allowable charging power, the vehicle controller sends a first control instruction to the generator controller and sends a second control instruction to the engine controller;

[0021] After receiving the first control instruction, the generator controller reduces the power generation of the generator to a preset value;

[0022] After receiving the second control instruction, the engine controller determines the target change rate according to the actual engine parameters of the engine in the extended-range power system and the preset corresponding relationship according to a preset period and adjusts the engine speed according to the target change rate until the engine speed reaches the idle speed, wherein the preset corresponding relationship includes the corresponding relationship between the engine parameters and the change rate when the engine NVH characteristic parameters are in an appropriate range.

[0023] In conjunction with the second aspect, in one embodiment, the generator controller is specifically configured to:

[0024] The control mode of the generator is switched from speed control to torque control, and the torque of the generator is reduced to zero.

[0025] In conjunction with the second aspect, in one embodiment, the engine controller is further configured to:

[0026] The control mode of the engine is switched from torque control to speed control.

[0027] In conjunction with the second aspect, in one embodiment, the engine controller is specifically configured to:

[0028] Detecting whether there are engine parameters in the preset correspondence that are consistent with actual engine parameters of the engine in the extended-range power system;

[0029] When there is no engine parameter consistent with the actual engine parameter in the preset corresponding relationship, determining two engine parameters closest to the actual engine parameter from the preset corresponding relationship;

[0030] constructing a linear equation based on the two closest engine parameters and their corresponding rates of change;

[0031] The actual engine parameters are substituted into the linear equation and the target change rate is obtained by solving the equation.

[0032] In a third aspect, an embodiment of the present application provides a control device for an extended-range power system, wherein the control device for the extended-range power system includes a processor, a memory, and a control program for the extended-range power system stored on the memory and executable by the processor, wherein when the control program for the extended-range power system is executed by the processor, the steps of the control method for the extended-range power system as described in the first aspect are implemented.

[0033] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium, on which a control program for an extended-range power system is stored. When the control program for the extended-range power system is executed by a processor, the steps of the control method for the extended-range power system as described in the first aspect are implemented.

[0034] The beneficial effects of the technical solutions provided in the embodiments of the present application include:

[0035] In an embodiment of the present application, when the sum of the required regenerative braking power and the power generated by the generator in the range-extended power system exceeds the battery's allowable charging power, the power generated is reduced to a preset value. During the process of reducing the power generated, a target rate of change is determined based on the actual engine parameters of the engine in the range-extended power system and a preset correspondence, and the engine speed is adjusted according to the target rate of change until the engine speed reaches the idle speed. The preset correspondence includes a correspondence between the engine parameters and the rate of change when the engine NVH characteristic parameters are within an appropriate range. Through the embodiment of the present application, the power generated is reduced, so that more power can be allocated for regenerative braking, thereby ensuring braking performance. In addition, during the process of reducing the power generated, the engine speed is adjusted to the idle speed according to the rate of change that keeps the engine NVH characteristic parameters within an appropriate range, thereby avoiding engine runaway and improving the riding experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 This is a flow chart of an embodiment of a control method for an extended-range power system of the present application;

[0037] Figure 2 This is a functional module diagram of an embodiment of a control device for an extended-range power system of the present application;

[0038] Figure 3 This is a schematic diagram of the hardware structure of the control device for the extended-range power system involved in the embodiment of the present application. DETAILED DESCRIPTION

[0039] In order to enable those skilled in the art to better understand the present invention, the following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0040] In order to make the objectives, technical solutions and advantages of this application clearer, the implementation methods of this application will be further described in detail below with reference to the accompanying drawings.

[0041] In a first aspect, an embodiment of the present application provides a control method for an extended-range power system.

[0042] In one embodiment, referring to Figure 1 , Figure 1 This is a flow chart of an embodiment of the control method for an extended-range power system of this application. Figure 1 As shown, the control method for the extended-range power system includes:

[0043] When the sum of the regenerative braking demand power and the power generated by the generator in the range-extended power system is greater than the battery's allowable charging power, reducing the power generated to a preset value;

[0044] In the process of reducing the generated power, the target change rate is determined according to the actual engine parameters of the engine in the extended-range power system and the preset correspondence according to the preset cycle, and the engine speed is adjusted according to the target change rate until the engine speed reaches the idle speed, wherein the preset correspondence includes the correspondence between the engine parameters and the change rate when the engine NVH characteristic parameters are in an appropriate range.

[0045] In this embodiment, the vehicle controller determines the total braking force based on the total braking demand. Subtracting the braking force provided by the hydraulic braking system yields the braking force required by the regenerative braking mechanism, thereby determining the regenerative braking power requirement Pz. Based on this, the generator power Pw is obtained from the generator controller, and the battery's allowable charging power Pc is obtained from the battery management system. The sum of Pz and Pw is then tested to determine whether it exceeds Pc.

[0046] When the sum of Pz and Pw exceeds Pc, the generated power is reduced to a preset value to maximize Pz, thereby increasing the braking force provided by the regenerative braking mechanism. The preset value is set based on actual needs. Furthermore, in one embodiment, the preset value is zero. Reducing the generated power to zero allows Pz to equal Pc, thereby maximizing braking performance.

[0047] Furthermore, in one embodiment, reducing the generated power to a preset value includes:

[0048] The control mode of the generator is switched from speed control to torque control, and the torque of the generator is reduced to zero.

[0049] In this embodiment, when the generator in the extended-range power system generates power normally, the power generation power Pw=Pg / ηg, where Pg=n*T / 9550, ηg is the system efficiency, T is the output torque of the engine or generator (the speed ratio of the engine and the generator is 1:1), and n is the actual speed of the generator or the engine. Therefore, controlling the extended-range power system is essentially controlling the engine and generator in the extended-range power system, and the power generation power is a combination of torque and speed. Therefore, there are two control methods, namely:

[0050] Control method 1: Torque control of the engine and speed control of the generator;

[0051] Control method 2: Control the engine speed and the generator torque.

[0052] Because the generator responds faster than the engine, the extended-range powertrain has better response speed and stronger anti-interference capabilities according to control mode 1. That is, during normal operation, the generator is controlled in speed mode. To reduce the generated power to zero, the generator control mode is switched from speed control to torque control. Then, based on the torque target value (which is zero), the generator is controlled to reduce the generator torque to zero.

[0053] It should be noted that the generator power is adjusted via the generator controller, while the engine speed is adjusted via the engine controller. Upon receiving control commands from the vehicle controller, the generator and engine controllers each perform corresponding adjustments. This means that the generator controller can begin reducing power at the same time as the engine controller begins adjusting engine speed, or they can proceed one after the other due to signal transmission. Overall, however, the power reduction and engine speed adjustment processes occur simultaneously.

[0054] Specifically, during the process of reducing power generation, starting at time t0 (the start time of engine speed adjustment), the actual engine parameter E0 of the engine in the range-extended power system at time t0 is obtained, and the target change rate T0 corresponding to E0 is determined based on a preset correspondence relationship. The engine speed R0 at time t0 is adjusted accordingly. When time t1 is reached (time t0 to time t1 is a preset period), the actual engine parameter E1 of the engine in the range-extended power system at time t1 is obtained, and the target change rate T1 corresponding to E1 is determined based on the preset correspondence relationship. The engine speed R1 at time t1 is adjusted accordingly. This process continues in this manner until the engine speed reaches the idle speed. The length of the preset period is set based on actual needs, for example, 500ms. The idle speed can be selected as needed within the range of 700-1000 rpm.

[0055] Preset correspondences include the correspondences between engine parameters and change rates when the engine NVH characteristic parameters are within an appropriate range. These preset correspondences can be obtained through experimentation. For example, when the engine parameter is engine parameter 1, the engine speed is adjusted at different change rates, and the corresponding engine NVH characteristic parameters are tested for each adjustment process to see if they are within the appropriate range. The appropriate range is set based on actual needs. NVH characteristic parameters include noise, vibration, and harshness. Specifically, the NVH characteristic parameters are quantified in a specific manner, and the quantized values ​​are tested to see if they are within the corresponding appropriate range. For example, when the engine parameter is engine parameter 1, the engine speed is adjusted at a change rate x. If the engine NVH characteristic parameters are within the appropriate range, then the correspondence between engine parameter 1 and change rate x is used as a correspondence. Similarly, correspondences between multiple engine parameters and change rates are constructed to obtain preset correspondences. Engine parameters include one or more of engine water temperature, engine speed, and engine torque.

[0056] Furthermore, in one embodiment, before determining the target change rate according to the actual engine parameters of the engine in the range-extended power system and the preset corresponding relationship at a preset period and adjusting the engine speed according to the target change rate until the engine speed reaches the idle speed, the method further includes:

[0057] The control mode of the engine is switched from torque control to speed control.

[0058] In this embodiment, referring to the above description, during normal operation of the range-extended powertrain, the generator control mode is speed control, and the engine control mode is torque control. To reduce power generation, the generator control mode is switched from speed control to torque control, and the engine control mode is correspondingly switched from torque control to speed control. This process involves determining a target rate of change based on the actual engine parameters of the range-extended powertrain engine and a preset mapping relationship at a predetermined period, and adjusting the engine speed in accordance with the target rate of change until the engine speed reaches idle speed.

[0059] In an embodiment of the present application, when the sum of the required regenerative braking power and the power generated by the generator in the range-extended power system exceeds the battery's allowable charging power, the power generated is reduced to a preset value. During the process of reducing the power generated, a target rate of change is determined based on the actual engine parameters of the engine in the range-extended power system and a preset correspondence, and the engine speed is adjusted according to the target rate of change until the engine speed reaches the idle speed. The preset correspondence includes a correspondence between the engine parameters and the rate of change when the engine NVH characteristic parameters are within an appropriate range. Through the embodiment of the present application, the power generated is reduced, so that more power can be allocated for regenerative braking, thereby ensuring braking performance. In addition, during the process of reducing the power generated, the engine speed is adjusted to the idle speed according to the rate of change that keeps the engine NVH characteristic parameters within an appropriate range, thereby avoiding engine runaway and improving the riding experience.

[0060] Furthermore, in one embodiment, determining the target change rate based on actual engine parameters of the engine in the extended-range power system and a preset correspondence includes:

[0061] Detecting whether there are engine parameters in the preset correspondence that are consistent with actual engine parameters of the engine in the extended-range power system;

[0062] When there is no engine parameter consistent with the actual engine parameter in the preset corresponding relationship, determining two engine parameters closest to the actual engine parameter from the preset corresponding relationship;

[0063] constructing a linear equation based on the two closest engine parameters and their corresponding rates of change;

[0064] The actual engine parameters are substituted into the linear equation and the target change rate is obtained by solving the equation.

[0065] In this embodiment, for ease of explanation, the engine parameter is taken as engine water temperature. Specifically, the preset correspondences include the correspondence between engine water temperature 1 and change rate 1, the correspondence between engine water temperature 2 and change rate 2, the correspondence between engine water temperature 3 and change rate 3, and so on, and the correspondence between engine water temperature X and change rate X.

[0066] When determining the target change rate, first search for an engine water temperature that is consistent with the actual engine water temperature from engine water temperature 1 to engine water temperature X. If engine water temperature 7 is consistent with the actual engine water temperature, the change rate 7 corresponding to engine water temperature 7 is directly used as the target change rate.

[0067] However, it is easy to understand that the preset correspondence is constructed based on actual vehicle testing and cannot cover all situations. Therefore, it is common that there is no engine water temperature consistent with the actual engine water temperature from Engine Water Temperature 1 to Engine Water Temperature X. In this case, the engine water temperature closest to the actual engine water temperature can be found from Engine Water Temperature 1 to Engine Water Temperature X. For example, if the engine water temperature closest to the actual engine water temperature is Engine Water Temperature 7, the change rate of 7 corresponding to Engine Water Temperature 7 can be used as the target change rate. Alternatively, the two engine water temperatures closest to the actual engine water temperature can be found from Engine Water Temperature 1 to Engine Water Temperature X. For example, the two engine water temperatures closest to the actual engine water temperature are Engine Water Temperature 3 and Engine Water Temperature 7, respectively. In this case, a linear equation can be constructed by combining Engine Water Temperature 3, Change Rate 3, Engine Water Temperature 7, and Change Rate 7, with Engine Water Temperature as the independent variable and Change Rate as the dependent variable. Finally, the actual engine parameters can be substituted into the linear equation, and the value obtained by solving it can be used as the target change rate.

[0068] In a second aspect, an embodiment of the present application also provides a control device for an extended-range power system.

[0069] In one embodiment, referring to Figure 2 , Figure 2 This is a functional module diagram of an embodiment of a control device for an extended-range power system of the present application. Figure 2 As shown, the control device for the extended-range power system includes a vehicle controller 10, a generator controller 20 and an engine controller 30, wherein:

[0070] When the sum of the regenerative braking demand power and the generator power generated in the range-extended power system is greater than the battery allowable charging power, the vehicle controller 10 sends a first control instruction to the generator controller 20 and sends a second control instruction to the engine controller 30;

[0071] After receiving the first control instruction, the generator controller 20 reduces the power generation of the generator to a preset value;

[0072] After receiving the second control instruction, the engine controller 30 determines the target change rate according to the actual engine parameters of the engine in the extended-range power system and the preset correspondence according to a preset period and adjusts the engine speed according to the target change rate until the engine speed reaches the idle speed, wherein the preset correspondence includes the correspondence between the engine parameters and the change rate when the engine NVH characteristic parameters are in an appropriate range.

[0073] Furthermore, in one embodiment, the generator controller 20 is specifically configured to:

[0074] The control mode of the generator is switched from speed control to torque control, and the torque of the generator is reduced to zero.

[0075] Furthermore, in one embodiment, the engine controller 30 is further configured to:

[0076] The control mode of the engine is switched from torque control to speed control.

[0077] Furthermore, in one embodiment, the engine controller 30 is specifically configured to:

[0078] Detecting whether there are engine parameters in the preset correspondence that are consistent with actual engine parameters of the engine in the extended-range power system;

[0079] When there is no engine parameter consistent with the actual engine parameter in the preset corresponding relationship, determining two engine parameters closest to the actual engine parameter from the preset corresponding relationship;

[0080] constructing a linear equation based on the two closest engine parameters and their corresponding rates of change;

[0081] The actual engine parameters are substituted into the linear equation and the target change rate is obtained by solving the equation.

[0082] Among them, the functional implementation of each module in the above-mentioned control device for the extended-range power system corresponds to the various steps in the above-mentioned control method embodiment for the extended-range power system, and their functions and implementation processes will not be repeated here one by one.

[0083] In a third aspect, an embodiment of the present application provides a control device for an extended-range power system.

[0084] Reference Figure 3 , Figure 3 Schematic diagram of the hardware structure of the control device for the extended-range power system involved in the embodiment of the present application. In the embodiment of the present application, the control device for the extended-range power system may include a processor, a memory, a communication interface, and a communication bus.

[0085] The communication bus may be of any type and is used to interconnect the processor, memory, and communication interface.

[0086] Communication interfaces include input / output (I / O) interfaces, physical interfaces, and logical interfaces, used to interconnect components within the extended-range powertrain control device, as well as interfaces used to interconnect the extended-range powertrain control device with other devices (such as other computing devices or user devices). Physical interfaces can include Ethernet, fiber optic, and ATM interfaces; user devices can include displays, keyboards, and other devices.

[0087] The memory can be various types of storage media, such as random access memory (RAM), read-only memory (ROM), non-volatile RAM (NVRAM), flash memory, optical storage, hard disk, programmable ROM (PROM), erasable PROM (EPROM), electrically erasable PROM (EEPROM), etc.

[0088] The processor may be a general-purpose processor that can call a control program for an extended-range power system stored in a memory and execute the control method for an extended-range power system provided in the embodiments of the present application. For example, the general-purpose processor may be a central processing unit (CPU). The method executed when the control program for the extended-range power system is called can refer to the various embodiments of the control method for the extended-range power system of the present application and will not be repeated here.

[0089] Those skilled in the art will understand that Figure 3 The hardware structure shown in the figure does not constitute a limitation to the present application and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0090] In a fourth aspect, an embodiment of the present application also provides a computer-readable storage medium.

[0091] The computer-readable storage medium of the present application stores a control program for the extended-range power system, wherein when the control program for the extended-range power system is executed by the processor, the steps of the control method for the extended-range power system as described above are implemented.

[0092] Among them, the method implemented when the control program for the extended-range power system is executed can refer to the various embodiments of the control method for the extended-range power system in this application, and will not be repeated here.

[0093] It should be noted that the serial numbers of the above-mentioned embodiments of the present application are for description only and do not represent the advantages or disadvantages of the embodiments.

[0094] The terms "including" and "having" and any variations thereof in the specification and claims of this application and the above-mentioned drawings are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices. The terms "first", "second" and "third" are used to distinguish different objects, etc., and do not represent a sequence, nor do they limit the "first", "second" and "third" to different types.

[0095] In the description of the embodiments of this application, the words "exemplary," "for example," or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary," "for example," or "for example" in the embodiments of this application should not be construed as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary," "for example," or "for example" is intended to present the relevant concepts in a concrete manner.

[0096] In the description of the embodiments of the present application, unless otherwise specified, “ / ” means or, for example, A / B can mean A or B; “and / or” in the text is merely a description of the association relationship of associated objects, indicating that three relationships may exist, for example, A and / or B can mean: A exists alone, A and B exist at the same time, and B exists alone. In addition, in the description of the embodiments of the present application, “multiple” refers to two or more than two.

[0097] In some processes described in the embodiments of the present application, multiple operations or steps are included that appear in a specific order. However, it should be understood that these operations or steps may not be performed in the order in which they appear in the embodiments of the present application or may be performed in parallel. The sequence numbers of the operations are only used to distinguish between different operations, and the sequence numbers themselves do not represent any order of execution. In addition, these processes may include more or fewer operations, and these operations or steps may be performed in sequence or in parallel, and these operations or steps may be combined.

[0098] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus the necessary general hardware platform, of course, it can also be implemented by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk) as described above, and includes a number of instructions for enabling a terminal device to execute the methods described in each embodiment of the present application.

[0099] The above are only preferred embodiments of the present application and do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the description and drawings of this application, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present application.

Claims

1. A control method for an extended-range power system, characterized in that: The control method for the extended-range power system includes: When the sum of the regenerative braking demand power and the power generated by the generator in the range-extended power system is greater than the battery's allowable charging power, reducing the power generated to a preset value; During the process of reducing the generated power, a target change rate is determined according to actual engine parameters of the engine in the range-extended power system and a preset correspondence relationship at a preset period, and the engine speed is adjusted according to the target change rate until the engine speed reaches the idle speed, wherein the preset correspondence relationship includes a correspondence between the engine parameters and the change rate when the engine NVH characteristic parameters are within an appropriate range; Determining the target change rate according to actual engine parameters of the engine in the extended-range power system and a preset corresponding relationship includes: Detecting whether there are engine parameters in the preset correspondence that are consistent with actual engine parameters of the engine in the extended-range power system; When there is no engine parameter consistent with the actual engine parameter in the preset corresponding relationship, determining two engine parameters closest to the actual engine parameter from the preset corresponding relationship; constructing a linear equation based on the two closest engine parameters and their corresponding rates of change; The actual engine parameters are substituted into the linear equation and the target change rate is obtained by solving the equation.

2. The control method for the extended-range power system according to claim 1, characterized in that: The preset value is zero.

3. The control method for the extended-range power system according to claim 2, characterized in that: The step of reducing the generated power to a preset value includes: The control mode of the generator is switched from speed control to torque control, and the torque of the generator is reduced to zero.

4. The control method for the extended-range power system according to claim 3, characterized in that: Before the target change rate is determined according to the actual engine parameters of the engine in the range-extended power system and the preset corresponding relationship at a preset period and the engine speed is adjusted according to the target change rate until the engine speed reaches the idle speed, the method further includes: The control mode of the engine is switched from torque control to speed control.

5. A control device for an extended-range power system, characterized in that: The control device for the extended-range power system includes a vehicle controller, a generator controller, and an engine controller, wherein: When the sum of the regenerative braking demand power and the power generated by the generator in the range-extended power system is greater than the battery's allowable charging power, the vehicle controller sends a first control instruction to the generator controller and sends a second control instruction to the engine controller; After receiving the first control instruction, the generator controller reduces the power generation of the generator to a preset value; After receiving the second control instruction, the engine controller determines a target change rate according to actual engine parameters of the engine in the extended-range power system and a preset correspondence relationship at a preset period, and adjusts the engine speed according to the target change rate until the engine speed reaches the idle speed, wherein the preset correspondence relationship includes a correspondence between the engine parameters and the change rate when the engine NVH characteristic parameters are within an appropriate range; The engine controller is specifically used for: Detecting whether there are engine parameters in the preset correspondence that are consistent with actual engine parameters of the engine in the extended-range power system; When there is no engine parameter consistent with the actual engine parameter in the preset corresponding relationship, determining two engine parameters closest to the actual engine parameter from the preset corresponding relationship; constructing a linear equation based on the two closest engine parameters and their corresponding rates of change; The actual engine parameters are substituted into the linear equation and the target change rate is obtained by solving the equation.

6. The control device for the extended-range power system according to claim 5, characterized in that: The generator controller is specifically used for: The control mode of the generator is switched from speed control to torque control, and the torque of the generator is reduced to zero.

7. The control device for the extended-range power system according to claim 6, characterized in that: The engine controller is also used to: The control mode of the engine is switched from torque control to speed control.

8. A control device for an extended-range power system, characterized in that: The control device for the extended-range power system includes a processor, a memory, and a control program for the extended-range power system stored in the memory and executable by the processor, wherein when the control program for the extended-range power system is executed by the processor, the steps of the control method for the extended-range power system as described in any one of claims 1 to 4 are implemented.

9. A computer-readable storage medium, characterized in that The computer-readable storage medium stores a control program for an extended-range power system, wherein when the control program for the extended-range power system is executed by a processor, the steps of the control method for the extended-range power system according to any one of claims 1 to 4 are implemented.

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