Control method, device and equipment for extended-range power system and storage medium

Abstract

The invention discloses a control method, device and equipment for an extended-range power system and a storage medium. The method comprises the following steps: when the sum of regenerative braking required power and generated power of a generator in the extended-range power system is greater than allowable charging power of a battery, reducing the generated power to a preset value; in the process of reducing the generated power, determining a target change rate according to actual engine parameters of an engine in the extended-range power system and a preset corresponding relation according to a preset period, and adjusting the rotating speed of the engine according to the target change rate until the rotating speed of the engine reaches an idle rotating speed, the preset corresponding relationship comprises a corresponding relationship between the engine parameter and the change rate when the engine NVH characteristic parameter is in a suitable interval. According to the invention, the generated power is reduced, so that feedback braking can be realized, and higher power can be distributed, thereby ensuring the braking performance; and in the process of reducing the generated power, it is guaranteed that the NVH characteristic parameters of the engine are within a proper interval, galloping of the engine is avoided, and the riding 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 power system brakes, in addition to the braking force applied by the hydraulic braking system, the regenerative braking of the drive motor also provides a part of the braking force, thereby improving the braking performance. Among them, the greater the regenerative braking power, the greater the braking force provided by the regenerative braking. However, the battery management system (BMS) will set the maximum allowable charging current at 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 the regenerative braking power Pz + the generator power generation power Pw ≤ Pc.

[0003] It can be seen that when regenerative braking is needed to participate in braking, if the generator in the extended-range power system is still generating electricity at high power, this will result in the braking capacity that can be allocated to the drive motor being limited, the braking energy cannot be effectively recovered, and the braking performance is greatly reduced.

[0004] In order to avoid overcharging the battery and improve the braking performance as much as possible, the conventional practice is to shut down the generator to make Pw zero, so that Pc can be used as the feedback braking power. However, since the engine torque decreases more slowly than the generator, when the generator is generating high power, directly shutting down the generator will cause the engine to still output high torque when the generator torque drops to zero, causing the engine to run away, thereby generating a lot of 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, and the control method for the extended-range power system includes:

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

[0008] In the process of reducing the power generation, the target change rate is determined according to the actual engine parameters of the engine in the extended-range power system and the preset corresponding relationship 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 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.

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

[0010] In combination with the first aspect, in one implementation, 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 combination with the first aspect, in one embodiment, 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, it also includes:

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

[0014] In combination with the first aspect, in one implementation, 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 the corresponding rates of change;

[0018] Substitute the actual engine parameters into the linear equation and solve to obtain the target change rate.

[0019] In a second 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 vehicle controller, a generator controller, and an engine controller, wherein:

[0020] When the sum of the required regenerative braking power and the power generated by the generator in the range-extended power system is greater than the allowable charging power of the battery, 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 the preset cycle 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 implementation, 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 implementation, 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 implementation, 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 the corresponding rates of change;

[0031] Substitute the actual engine parameters into the linear equation and solve to obtain the target change rate.

[0032] In a third 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 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 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, 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 as described in the first aspect are implemented.

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

[0035] In the embodiment of the present application, when the sum of the required power of regenerative braking and the power generated by the generator in the range-extended power system is greater than the allowable charging power of the battery, the power generated is reduced to a preset value; in the process of reducing the power generated, 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 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 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. Through the embodiment of the present application, the power generated is reduced, so that the regenerative braking can allocate more power, thereby ensuring the braking performance; and in the process of reducing the power generated, the engine speed is adjusted to the idle speed according to the change rate that makes the engine NVH characteristic parameters in an appropriate range, thereby avoiding engine speeding 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 solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, 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 the present application clearer, the implementation methods of the present 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 a control method for an extended-range power system of the present application. Figure 1 As shown, the control method for the extended-range power system includes:

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

[0044] In the process of reducing the power generation, the target change rate is determined according to the actual engine parameters of the engine in the extended-range power system and the preset corresponding relationship 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 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.

[0045] In this embodiment, the total braking force can be determined by the vehicle controller based on the total braking demand, and the braking force that can be provided by the hydraulic braking system can be subtracted to obtain the braking force required by the regenerative braking mechanism, thereby determining the regenerative braking demand power Pz. On this basis, the generator power Pw is further obtained from the generator controller, and the battery allowable charging power Pc is obtained from the battery management system, and it is detected whether the sum of Pz and Pw is greater than Pc.

[0046] When the sum of Pz and Pw is greater than Pc, the generated power is reduced to a preset value to increase the value of Pz as much as possible, thereby increasing the braking force provided by the feedback braking mechanism. The preset value is set according to actual needs. Further, in one embodiment, the preset value is zero. Reducing the generated power to zero can make Pz = Pc, thereby maximizing the 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 electricity normally, the power generation 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 the generator in the extended-range power system, and the power generation is the combination of torque and speed. Therefore, there are two control modes in terms of control, namely:

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

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

[0052] Among them, since the response speed of the generator is faster than that of the engine, according to the control mode 1, the extended-range power system has a better response speed and stronger anti-interference ability. That is, when the extended-range power system is working normally, the control mode of the generator is speed control. When the power generation needs to be reduced to zero, the control mode of the generator is first switched from speed control to torque control, and then the generator is controlled based on the torque target value (zero) so that the torque of the generator is reduced to zero.

[0053] It should be noted that the adjustment of the power generation of the generator is realized through the generator controller, and the adjustment of the engine speed is realized through the engine control, wherein the generator controller and the engine controller respectively perform corresponding adjustment actions after receiving the control instruction sent by the vehicle controller. That is, the moment when the generator controller starts to reduce the power and the moment when the engine controller starts to adjust the engine speed can be equal, or they can be carried out one after another due to the influence of signal transmission, but from the overall point of view, the process of reducing the power generation and the process of adjusting the engine speed are carried out synchronously.

[0054] Specifically, in the process of reducing the power generation, starting from the time t0 (the starting time of adjusting the engine speed), the actual engine parameter E0 of the engine in the range-extending power system at the time t0 is obtained, and the target change rate T0 corresponding to E0 is determined in combination with the preset corresponding relationship, and the engine speed R0 at the time t0 is adjusted according to T0; when reaching the time t1 (the time t0 to the time t1 is a preset period), the actual engine parameter E1 of the engine in the range-extending power system at the time t1 is obtained, and the target change rate T1 corresponding to E1 is determined in combination with the preset corresponding relationship, and the engine speed R1 at the time t1 is adjusted according to T1, and so on, until the engine speed reaches the idle speed. Among them, the size of the preset period is set based on actual needs, for example, it is set to 500ms; the idle speed can be selected as needed in the range of 700-1000 rpm.

[0055] The preset corresponding relationship includes the corresponding relationship between the engine parameter and the change rate when the engine NVH characteristic parameter is in an appropriate range, and the preset corresponding relationship can be obtained through experiments. For example, when the engine parameter is engine parameter 1, the engine speed is adjusted according to different change rates, and it is detected whether the engine NVH characteristic parameter corresponding to each adjustment process is in an appropriate range, wherein the appropriate range is set based on actual needs. Among them, the NVH characteristic parameters include noise, vibration, and harshness. That is, the NVH characteristic parameters are quantified in a specific way, and it is detected whether the quantized value is in the corresponding appropriate range. Assuming that the engine parameter is engine parameter 1, the engine speed is adjusted according to the change rate x, and the engine NVH characteristic parameter is in an appropriate range at this time, then the engine parameter 1 and the change rate x are used as a corresponding relationship. By analogy, the corresponding relationship between multiple engine parameters and change rates is constructed, thereby obtaining the preset corresponding relationship. Among them, the engine parameters include one or more of the engine water temperature, the engine speed, and the engine torque.

[0056] Furthermore, in one embodiment, the step of 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 according to the preset period and adjusting the engine speed according to the target change rate until the engine speed reaches the idle speed 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, when the extended-range power system is in normal operation, the control mode of the generator is speed control and the control mode of the engine is torque control. When the power generation is reduced, the control mode of the generator is switched from speed control to torque control, and the control mode of the engine is correspondingly switched from torque control to speed control, thereby performing the process of "determining 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 the preset cycle and adjusting the engine speed according to the target change rate until the engine speed reaches the idle speed".

[0059] In the embodiment of the present application, when the sum of the required power of regenerative braking and the power generated by the generator in the range-extended power system is greater than the allowable charging power of the battery, the power generated is reduced to a preset value; in the process of reducing the power generated, 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 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 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. Through the embodiment of the present application, the power generated is reduced, so that the regenerative braking can allocate more power, thereby ensuring the braking performance; and in the process of reducing the power generated, the engine speed is adjusted to the idle speed according to the change rate that makes the engine NVH characteristic parameters in an appropriate range, thereby avoiding engine speeding and improving the riding experience.

[0060] Further, in one embodiment, determining the target change rate according to the actual engine parameters of the engine in the extended-range power system and the preset corresponding relationship 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 the corresponding rates of change;

[0064] Substitute the actual engine parameters into the linear equation and solve to obtain the target change rate.

[0065] In this embodiment, for the sake of convenience, the engine parameter takes the engine water temperature as an example. That is, the preset corresponding relationship includes the corresponding relationship between engine water temperature 1 and change rate 1, the corresponding relationship between engine water temperature 2 and change rate 2, the corresponding relationship between engine water temperature 3 and change rate 3, ..., the corresponding relationship between engine water temperature X and change rate X.

[0066] When determining the target change rate, first search for an engine water temperature 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, then 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 corresponding relationship is constructed based on the actual vehicle test, and it is difficult to cover all situations. Therefore, it is a common situation that there is no engine water temperature consistent with the actual engine water temperature in the engine water temperature 1 to engine water temperature X. At this time, the engine water temperature closest to the actual engine water temperature can be found from the engine water temperature 1 to engine water temperature X. For example, the engine water temperature closest to the actual engine water temperature is engine water temperature 7, and the change rate 7 corresponding to engine water temperature 7 is used as the target change rate. It is also possible to find two engine water temperatures closest to the actual engine water temperature from the 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. Then, the engine water temperature 3, the change rate 3, the engine water temperature 7 and the change rate 7 can be combined, and the engine water temperature is used as the independent variable and the change rate is used as the dependent variable to construct a linear equation. Finally, the actual engine parameters are 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 power generated by the generator in the extended-range 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 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.

[0073] Furthermore, in one embodiment, the generator controller 20 is specifically used for:

[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 also used for:

[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 used for:

[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 the corresponding rates of change;

[0081] Substitute the actual engine parameters into the linear equation and solve to obtain the target change rate.

[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 its 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, the memory, and the communication interface.

[0086] The communication interface includes input / output (I / O) interfaces, physical interfaces, and logical interfaces for interconnecting devices within the control device for the extended-range power system, as well as interfaces for interconnecting the control device for the extended-range power system with other devices (such as other computing devices or user devices). The physical interface can be an Ethernet interface, a fiber optic interface, an ATM interface, etc.; the user device can be a display, a keyboard, etc.

[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, which may call the control program for the extended-range power system stored in the memory and execute the control method for the extended-range power system provided in the embodiment 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 may refer to the various embodiments of the control method for the extended-range power system of the present application, which 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 on the present application, and may include more or fewer components than shown in the figure, or combine certain components, or arrange the components differently.

[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 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 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 only for description 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 "first", "second" and "third" to different types.

[0095] In the description of the embodiments of the present application, "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 the present application should not be interpreted as being more preferred or more advantageous than other embodiments or designs. Specifically, the use of words such as "exemplary", "for example" or "for example" is intended to present related concepts in a specific way.

[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; the “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 that appear in a specific order are included, but it should be understood that these operations or steps may not be executed in the order in which they appear in the embodiments of the present application or in parallel, and the sequence number of the operation is only used to distinguish the different operations, and the sequence number itself does not represent any execution order. In addition, these processes may include more or fewer operations, and these operations or steps may be executed 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 a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application is essentially 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, disk, CD) as described above, and includes a number of instructions for 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 are not intended to limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, 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 required regenerative braking power and the power generated by the generator in the range-extended power system is greater than the allowable charging power of the battery, the power generated is reduced to a preset value; In the process of reducing the power generation, the target change rate is determined according to the actual engine parameters of the engine in the extended-range power system and the preset corresponding relationship 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 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.

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 comprises: 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: In the step of 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 according to the preset period and adjusting the engine speed according to the target change rate until the engine speed reaches the idle speed, it also includes: The control mode of the engine is switched from torque control to speed control.

5. The control method for the extended-range power system according to claim 1, characterized in that: The determining of the target change rate according to the actual engine parameters of the engine in the extended-range power system and the 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 the corresponding rates of change; Substitute the actual engine parameters into the linear equation and solve to obtain the target change rate.

6. 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 required regenerative braking power and the power generated by the generator in the range-extended power system is greater than the allowable charging power of the battery, 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 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 the preset cycle 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.

7. The control device for the extended-range power system according to claim 6, characterized in that: Generator controllers are 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.

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

9. 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 5 are implemented.

10. 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 as described in any one of claims 1 to 5 are implemented.

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