Generated power switching method and system of range extender, storage medium and program product

Abstract

The invention provides a power generation power switching method and system of a range extender, a storage medium and a program product, and relates to the technical field of engine control, and the method comprises the steps that the required power of the range extender is monitored; when the required power is increased, a first switching control strategy is triggered to start a generator rotating speed control mode, target rotating speeds of the generator in different control periods are dynamically adjusted based on the required power, and the torque minimum value of the generator in each control period is limited to be not smaller than the actual torque of the generator in the previous control period; when the required power is reduced, a second switching control strategy is triggered to start a generator rotating speed control mode, target rotating speeds of the generator in different control periods are dynamically adjusted based on the required power, and the maximum torque value of the generator in each control period is limited to be not larger than the actual torque of the generator in the previous control period. According to the method, the power reverse warping phenomenon can be effectively avoided through a limiting measure on the torque of the generator.

Description

Technical Field

[0001] This disclosure belongs to the field of engine control technology, specifically relating to a method, system, storage medium, and program product for switching the power generation of a range extender. Background Technology

[0002] A range extender consists of an engine and a generator, with the engine driving the generator to produce electricity for the vehicle. When the range extender switches between generating power, it typically employs a generator speed control mode, an engine torque control mode, or a combination of both, to ensure that the generator speed and engine torque move toward their respective target values.

[0003] In related technologies, in generator speed control mode, the target generator speed is obtained from a lookup table based on the required power, and a PID controller is used to regulate the actual generator torque so that the actual generator speed tracks the target speed. In engine torque control mode, the target engine torque is obtained from a lookup table based on the required power, and actuators such as the throttle and fuel injection quantity are used to make the engine output that torque.

[0004] The power generation switching methods of related technologies have the following drawbacks: When the demand power increases, the target speed of the generator increases accordingly. To achieve a rapid increase in speed, the PID controller reduces the actual torque of the generator, resulting in a momentary drop in actual power generation and a power reversal phenomenon. Conversely, when the demand power decreases, the target speed of the generator decreases accordingly. To achieve a rapid decrease in speed, the PID controller increases the actual torque of the generator, resulting in a momentary increase in actual power generation and a similar power reversal phenomenon. Summary of the Invention

[0005] This disclosure provides a method, system, storage medium, and program product for switching the power output of a range extender, aiming to at least partially solve the technical problem that the generator speed control mode is prone to power reversal during power output switching in related technologies.

[0006] At least one embodiment of this disclosure provides a method for switching the power generation of a range extender, the range extender including an engine and a generator, and the range extender being configured with a generator speed control mode, the method comprising:

[0007] Monitor the power demand of the range extender;

[0008] When the power demand increases, a first switching control strategy is triggered, wherein the first switching control strategy is configured to activate the generator speed control mode, dynamically adjust the target speed of the generator in different control cycles under the generator speed control mode based on the power demand, and limit the minimum torque of the generator in each control cycle to be no less than the actual torque of the generator in the previous control cycle; and,

[0009] When the required power decreases, a second switching control strategy is triggered. The second switching control strategy is configured to start the generator speed control mode, dynamically adjust the target speed of the generator in different control cycles under the generator speed control mode based on the required power, and limit the maximum torque of the generator in each control cycle to not be greater than the actual torque of the generator in the previous control cycle.

[0010] The method provided in at least one embodiment of this disclosure further includes:

[0011] After triggering the first switching control strategy or the second switching control strategy, the actual power generation of the generator in each control cycle is obtained; and,

[0012] When the required power of the range extender no longer changes and the deviation between the actual power output of the generator and the required power is less than a preset power threshold, the torque limitation on the generator is lifted.

[0013] In at least one embodiment of the method provided in this disclosure, the range extender is further configured with an engine torque control mode, and the first switching control strategy includes:

[0014] The generator speed control mode is activated, a first mapping relationship between the required power and the target speed is obtained, the target speed of the generator in each control cycle under the generator speed control mode is obtained based on the first mapping relationship, the generator speed is adjusted based on the target speed, and the minimum torque of the generator in each control cycle is limited to be no less than the actual torque of the generator in the previous control cycle; and,

[0015] The engine torque control mode is activated, and a second mapping relationship is obtained between the target torque, the required power, and the actual speed of the generator. Based on the second mapping relationship, the target torque of the engine in each control cycle of the engine torque control mode is obtained, and torque control of the engine is performed based on the target torque.

[0016] In at least one embodiment of the method provided in this disclosure, the second switching control strategy includes:

[0017] The generator speed control mode is activated, and a third mapping relationship between the required power and the target speed is obtained. Based on the third mapping relationship, the target speed of the generator in each control cycle of the generator speed control mode is obtained. The generator speed is controlled based on the target speed, while limiting the maximum torque of the generator in each control cycle to not exceed the actual torque of the generator in the previous control cycle; and...

[0018] The engine torque control mode is activated, and a fourth mapping relationship is obtained between the target torque, the demand power, and the actual speed of the generator when the demand power increases. Based on the fourth mapping relationship, the target torque of the engine in each control cycle of the engine torque control mode is obtained, and the engine torque is controlled based on the target torque.

[0019] The method provided in at least one embodiment of this disclosure further includes:

[0020] After triggering the first switching control strategy and the second switching control strategy and removing the torque limitation on the engine, the target torque of the engine is restored to the set torque that matches the current power demand.

[0021] In the method provided in at least one embodiment of this disclosure, in the first and third mapping relationships, the target rotational speed is configured to be positively correlated with the required power, and in the second and fourth mapping relationships, the target torque is configured to be positively correlated with the required power and inversely correlated with the target rotational speed; and,

[0022] In the initial stage of both the first and second switching control strategies, the generator speed control mode is used so that the actual torque of the generator remains unchanged while the actual torque of the engine changes.

[0023] The method provided in at least one embodiment of this disclosure further includes:

[0024] In response to an increase or decrease in power demand, first information is generated to characterize that the range extender's power generation has entered a switching state; and,

[0025] In response to the range extender's power demand no longer changing and the deviation between the generator's actual power output and the power demand being less than a preset power threshold, second information is generated to characterize the end of the range extender's power output switching.

[0026] At least one embodiment of this disclosure also provides a power generation switching control system for a range extender, the range extender including an engine and a generator, and the range extender being configured with a generator speed control mode, the system comprising:

[0027] A data monitoring unit is configured to monitor the power demand of the range extender;

[0028] A data monitoring unit is configured to monitor the power demand of the range extender;

[0029] A first control unit is configured to activate when the power demand increases, triggering its built-in first switching control strategy. This first switching control strategy is configured to activate the generator speed control mode, dynamically adjust the target speed of the generator in different control cycles under the generator speed control mode based on the power demand, and limit the minimum torque of the generator in each control cycle to be no less than the actual torque of the generator in the previous control cycle; and...

[0030] The second control unit is configured to start when the demand power decreases and trigger its built-in second switching control strategy. The second switching control strategy is configured to start the generator speed control mode, dynamically adjust the target speed of the generator in different control cycles under the generator speed control mode based on the demand power, and limit the maximum torque of the generator in each control cycle to not be greater than the actual torque of the generator in the previous control cycle.

[0031] At least one embodiment of this disclosure also provides a storage medium storing a program or instructions, wherein the program or instructions, when executed by a processor, implement the steps of the method provided in any embodiment of this disclosure.

[0032] At least one embodiment of this disclosure also provides a product including a program or instructions, wherein the program or instructions, when executed by a processor, implement the steps of the method provided in any embodiment of this disclosure.

[0033] Compared to related technologies, the range extender power switching method, system, storage medium, and program product provided in this disclosure offer an improved power generation condition switching scheme. This scheme, applied during range extender power generation condition switching, ensures that the generator's output power remains stable and uniform during operation by precisely and effectively limiting the generator's torque. This effectively avoids power generation fluctuations caused by excessive or insufficient torque, preventing any potential equipment damage or malfunction, and ensuring the safe and stable operation of the entire power generation system. This refined switching strategy effectively eliminates power fluctuations caused by changes in operating conditions, significantly improving the stability and reliability of the power generation system, ensuring continuous and efficient power output, and solving the technical problem of power backlash that easily occurs in generator speed control mode during power generation switching in related technologies.

[0034] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit this disclosure. Attached Figure Description

[0035] To more clearly illustrate the technical solutions in the embodiments of this disclosure, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0036] Figure 1 A flowchart of a power generation switching method provided in at least one embodiment of this disclosure;

[0037] Figure 2 A schematic diagram illustrating the composition of an extender instance provided in at least one embodiment of this disclosure;

[0038] Figure 3 A flowchart illustrating an example of a power generation switching method provided in at least one embodiment of this disclosure;

[0039] Figure 4 A structural block diagram of a power generation switching control system provided in at least one embodiment of this disclosure;

[0040] Figure 5 A schematic diagram illustrating the composition of a program product provided for at least one embodiment of this disclosure.

[0041] Figure label:

[0042] 1-Range extender power switching control system; 11-Data monitoring unit; 12-First control unit; 13-Second control unit; 21-Processor; 22-Memory; 23-Input device; 24-Output device; VCU-Vehicle controller; RCU-Range extender controller; ECU-Engine controller; GCU-Generator controller. Detailed Implementation

[0043] The present disclosure will now be described in further detail with reference to the accompanying drawings and embodiments. It should be particularly noted that the following embodiments are for illustrative purposes only and do not limit the scope of the disclosure. Similarly, the following embodiments are only some, not all, embodiments of the present disclosure, and all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0044] The terms "first," "second," and "third" used in the embodiments of this disclosure are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first," "second," and "third" may explicitly or implicitly include at least one of that feature.

[0045] In the description of this disclosure, "multiple" means at least two, such as two or three, unless otherwise expressly and specifically limited.

[0046] In this disclosure, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0047] The terms “comprising” and “having”, and any variations thereof, used in this disclosure are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or components inherent to such processes, methods, products, or devices.

[0048] In this disclosure, the term "engine controller" or ECU is used to control engine operation.

[0049] The term "generator controller" (GCU) used in this disclosure is used to control the operation of the generator.

[0050] In this disclosure, the term "range extender controller" (RCU) coordinates the operation of the GCU and ECU, and monitors the relevant status of the GCU and ECU.

[0051] In this disclosure, the term "vehicle controller" (VCU) is used to coordinate the operation of the RCU.

[0052] In this disclosure, the term "range extender" refers to an auxiliary power system for a vehicle that provides additional power to the vehicle when the battery is low, thereby extending the vehicle's driving range. A range extender typically consists of an engine and a generator; the engine drives the generator to produce electricity, which powers the vehicle's drive motor or directly charges the battery.

[0053] The relevant technology suffers from a technical problem where power reversal can easily occur during generator speed control mode when switching power output. This reversal can cause battery current surges, NVH deterioration, and a worse driving experience.

[0054] To address the aforementioned technical problems, this disclosure proposes a power switching method that can eliminate power backlash. This method, when the range extender faces fluctuations or changes in power demand, can promptly and effectively limit and regulate the generator speed, thereby effectively preventing power backlash caused by sudden changes in power demand. This ensures stable generator operation and the safety and reliability of the power system. This torque-limiting strategy not only avoids the potential risks associated with power backlash but also improves generator efficiency and overall performance, guaranteeing the continuity and stability of power supply.

[0055] Figure 1 This is a flowchart illustrating a power generation switching method provided in at least one embodiment of this disclosure. The method is applied to a range extender having an engine and a generator, and the range extender is equipped with a generator speed control mode, which can be set to other operating modes as needed. Figure 1 As shown, the method may include the following steps S10-S30.

[0056] Step S10: Monitor the power demand of the range extender.

[0057] Step S20: When the demand power increases, the first switching control strategy is triggered. The first switching control strategy is configured to start the generator speed control mode, dynamically adjust the target speed of the generator in different control cycles under the generator speed control mode based on the demand power, and limit the minimum torque of the generator in each control cycle to be no less than the actual torque of the generator in the previous control cycle (hereinafter referred to as the minimum torque limit of the generator).

[0058] Step S30: When the demand power decreases, the second switching control strategy is triggered. The second switching control strategy is configured to start the generator speed control mode, dynamically adjust the target speed of the generator in different control cycles under the generator speed control mode based on the demand power, and limit the maximum torque of the generator in each control cycle to not be greater than the actual torque of the generator in the previous control cycle (hereinafter referred to as the maximum torque limit of the generator).

[0059] In the above scheme, the power generation switching of the range extender is divided into two cases: one is an increase in demand power (rise), that is, the demand power of the current control cycle is greater than the demand power of the previous control cycle, corresponding to step S20; the other is a decrease in demand power (decrease), that is, the demand power of the current control cycle is less than the demand power of the previous control cycle, corresponding to step S30.

[0060] Some embodiments of this disclosure also provide systems, storage media, and program products corresponding to the methods described above.

[0061] The method provided by at least one embodiment of this disclosure is applicable to any existing range extender application scenario where power backlash may occur. For example, during the operation of an electric vehicle, when the battery charge is insufficient, the range extender starts and charges the battery or directly provides power to the drive motor. At this time, if the power output of the range extender is unstable, a power backlash occurs, i.e., the power suddenly increases instead of increasing steadily, which may lead to abnormalities in the vehicle's power system. By applying the method provided by at least one embodiment of this disclosure, the power demand of the range extender can be accurately monitored, and the operating states of the generator and engine can be adjusted in a timely manner, effectively avoiding the occurrence of power backlash, thereby improving the stability of the electric vehicle's power system and driving safety. For example, in congested urban traffic conditions, frequent starts and stops may cause drastic changes in the power demand of the range extender, while the method of this disclosure can respond and adjust quickly to ensure the smoothness and continuity of power output.

[0062] Compared to related technologies, the method proposed in this disclosure provides an improved method for switching power generation operating conditions. When switching power generation operating conditions in a range extender, this method, through precise and effective limiting measures on the generator torque, ensures that the generator's output power remains stable and uniform during operation. This effectively avoids power generation fluctuations caused by excessive or insufficient torque, thereby preventing any potential backlash that could damage equipment or cause operational abnormalities, and ensuring the safe and stable operation of the entire power generation system. This refined switching strategy effectively eliminates power fluctuations caused by changes in operating conditions, significantly improving the stability and reliability of the power generation system, ensuring the continuity and efficiency of power output, and solving the technical problem of power backlash that easily occurs in the generator speed control mode during power generation switching in related technologies.

[0063] In step S10, the range extender's power requirement can be determined by real-time monitoring of the electrical load and the charging status of the vehicle's battery pack. When the battery pack's charge level is below a preset threshold, the system prioritizes the charging needs of the battery pack and adjusts the range extender's output power according to the charging power required. Furthermore, the system also considers factors such as the vehicle's current speed, acceleration, and road conditions to dynamically adjust the range extender's power requirement, ensuring the vehicle's power performance and driving experience.

[0064] Step S20 aims to smoothly respond to increased power demand, preventing sharp fluctuations in generator torque and protecting the engine and power system from sudden high loads. Specifically, the target speed is dynamically adjusted based on the range extender's power demand, ensuring the generator responds well to the demand. A minimum torque limit is implemented, ensuring the generator's torque is not less than the actual torque in the previous control cycle, further reducing the magnitude of torque fluctuations and improving the power system's response stability and smoothness. This refined control strategy not only optimizes power output but also effectively extends the service life of the engine and generator.

[0065] Step S30 aims to smoothly respond to a decrease in demand power, ensuring stable changes in generator torque and avoiding excessive torque fluctuations. By limiting the maximum generator torque in each control cycle to no greater than the actual torque in the previous control cycle—that is, implementing a maximum torque limit—the sharp decrease in torque can be effectively reduced, preventing instability in the power system due to momentary low loads. This control strategy not only protects the power system from damage caused by torque fluctuations but also further enhances the stability and reliability of the entire power system, providing a strong guarantee for the efficient and safe operation of the vehicle.

[0066] Through steps S10-S30, the torque of the range extender is precisely controlled, enabling rapid response to changes in power demand and adjustments to generator speed and torque. This process not only considers the minimum torque limit to ensure stable power output but also effectively avoids power system instability caused by a sharp decrease in power demand by limiting the maximum torque. Through the comprehensive implementation of steps S10 to S30, this method not only optimizes the performance of the power system but also significantly improves its reliability and service life, providing solid technical support for the efficient and stable operation of vehicles under various working conditions.

[0067] Figure 2 This is a schematic diagram illustrating the composition of an extender instance provided in at least one embodiment of this disclosure. For example... Figure 2 As shown, the vehicle control unit (VCU) and the range extender controller (RCU) are connected via a CAN bus. The VCU transmits power generation requirements and commands to the RCU, while the RCU transmits power generation status and related fault information to the VCU. The RCU, engine control unit (ECU), and generator control unit (GCU) are connected via a separate CAN bus to coordinate the engine speed (controlled by the ECU) and torque (adjusted by the GCU) during power generation, monitor the actual power generation voltage and current, and ensure stable operation of the range extender. The schemes for steps S10-S30 can be configured in the RCU.

[0068] In some embodiments, in order to improve the efficiency and stability of the range extender during the power generation switching process, the method further includes the following steps S40 and S50.

[0069] Step S40: After triggering the first switching control strategy or the second switching control strategy, obtain the actual power generation of the generator in each control cycle.

[0070] Step S50: When the range extender’s power demand no longer changes and the deviation between the generator’s actual power output and the power demand is less than the preset power threshold, the torque limitation on the generator is lifted.

[0071] Steps S40 and S50 enable precise control of the generator's power output, further improving the range extender's efficiency and stability. In practical applications, when the range extender's power demand changes, the system first triggers either the first or second switching control strategy to ensure a smooth transition of the power system. Subsequently, step S40 acquires the generator's actual power output in each control cycle and compares it with the demand power. When the demand power is stable and the deviation between the actual power output and the demand power is less than a preset power threshold, the system executes step S50 to remove the limitation on the generator's torque—that is, to remove the minimum or maximum torque limit. This limitation is no longer enforced in subsequent control cycles, allowing the generator to operate within a wider torque range, thereby improving power generation efficiency and response speed. This flexible control strategy not only enhances the range extender's performance but also provides strong support for vehicle energy conservation and environmental protection.

[0072] In some embodiments, in order to make the actual power output of the generator change smoothly when the power demand increases and to prevent the power backlash phenomenon, the range extender is also provided with an engine torque control mode, and the first switching control strategy in step S20 is refined to include sub-steps S201-S202.

[0073] Sub-step S201: Start the generator speed control mode, obtain the first mapping relationship between the required power and the target speed, obtain the target speed of the generator in each control cycle under the generator speed control mode based on the first mapping relationship, adjust the generator speed based on the target speed, and at the same time limit the minimum torque of the generator in each control cycle to be no less than the actual torque of the generator in the previous control cycle.

[0074] Sub-step S202: Start the engine torque control mode, obtain the second mapping relationship between the target torque, the required power and the actual speed of the generator, obtain the target torque of the engine in each control cycle under the engine torque control mode based on the second mapping relationship, and perform torque control on the engine based on the target torque.

[0075] In sub-step S201, the first mapping relationship can be a demand power-target speed relationship table or a pre-calibrated test curve, which allows for a smooth power conversion. The target speed matching the demand power can be obtained by looking up the table or test curve. While controlling the generator to rotate at the target speed, a minimum torque limit is imposed on the generator, ensuring that the minimum torque of the generator is greater than or equal to the actual torque of the generator in the previous control cycle. In sub-step S202, the second mapping relationship can be a calibrated calculation formula, vector machine, or deep learning network. Based on the second mapping relationship, the target torque can be obtained, which includes dynamic calculation of the engine torque to ensure that sudden changes in torque will not cause excessive mechanical stress to the engine. Because the target torque of the engine is dynamically adjusted, the engine's durability and operational stability can be improved while ensuring power response.

[0076] In some embodiments, in order to make the actual power output of the generator change smoothly when the power demand decreases and to prevent power backlash, the second switching control strategy is refined to include the following sub-steps S301-S304.

[0077] Sub-step S301: Start the generator speed control mode, obtain the third mapping relationship between the required power and the target speed, obtain the target speed of the generator in each control cycle under the generator speed control mode based on the third mapping relationship, control the generator speed based on the target speed, and limit the maximum torque of the generator in each control cycle to not be greater than the actual torque of the generator in the previous control cycle.

[0078] Sub-step S302: Start the engine torque control mode, obtain the fourth mapping relationship between the target torque, the demand power and the actual speed of the generator when the demand power increases, obtain the target torque of the engine in each control cycle under the engine torque control mode based on the fourth mapping relationship, and perform torque control on the engine based on the target torque.

[0079] In sub-step S301, the third mapping relationship can be a demand power-target speed relationship table or a pre-calibrated test curve, which can make the power conversion smooth. The target speed matching the demand power can be obtained by looking up the table or test curve. While controlling the generator to rotate at the target speed, the maximum value of the generator torque is limited, so that the generator torque is greater than or equal to the actual torque of the generator in the previous control cycle. In sub-step S302, the fourth mapping relationship can be a calibrated calculation formula, vector machine, or deep learning network. The target torque can be obtained based on the fourth mapping relationship. It includes dynamic calculation of engine torque to ensure that sudden changes in torque will not cause excessive mechanical stress to the engine. Because the target torque of the engine is dynamically adjusted, the engine's durability and operational stability can be improved while ensuring power response.

[0080] In some embodiments, in order to further optimize the torque control of the engine during the switching process of different power generation operating points, the method further includes the following steps S60-S70.

[0081] Step S60: Before triggering the first switching control strategy or the second switching control strategy, set the engine's target torque to a set torque that matches the current power demand.

[0082] Step S70: After triggering the first switching control strategy and the second switching control strategy and removing the limitation on engine torque in each control cycle, restore the engine's target torque to the set torque that matches the current power demand.

[0083] Specifically, steps S60-S70 further optimize engine torque control during the switching process between different control strategies, preventing system instability or damage caused by sudden torque changes. In step S60, the engine's target torque is preset to a set torque that matches the current power demand. This setting ensures that the engine's torque output is reasonable and stable before the control strategy is switched. Step S70, after switching the control strategy and removing the limitation on engine torque, promptly restores the engine's target torque to the set torque that matches the current power demand, thereby ensuring that the engine's torque output after the switch still meets the system requirements and maintains stable system operation.

[0084] In some embodiments, to ensure efficient and stable engine operation under various operating conditions, the target speed is configured to be positively correlated with the required power in the first and third mapping relationships. Specifically, as the required power increases, the target speed also increases accordingly to ensure the engine can output sufficient power to meet system demands. This positive correlation configuration enables the engine to maintain efficient and stable operation under different operating conditions. Furthermore, by precisely controlling the mapping relationship between the target speed and the required power, the engine's fuel economy and emissions performance can be further optimized.

[0085] In some embodiments, to ensure the range extender maintains efficient and stable operation under different operating conditions, the target torque is configured to be positively correlated with the required power and inversely correlated with the target speed in the second and fourth mapping relationships. The second mapping relationship refers to the relationship between the required power and the target speed when the range extender is under the first control strategy; the fourth mapping relationship is the same, where the target torque is determined based on the required power and the target speed after the range extender switches to the second control strategy. By configuring the target torque to be positively correlated with the required power, it ensures that the engine's output power changes accordingly with the required power, meeting the system's power demands. Simultaneously, configuring the target torque to be inversely correlated with the target speed reduces torque as engine speed increases, avoiding excessive mechanical stress, protecting the engine and transmission system, and extending their service life. This configuration comprehensively considers the engine's power and economy, enabling the engine to maintain efficient and stable operation under different operating conditions.

[0086] In some embodiments, to enable the range extender to achieve more precise and efficient energy conversion and control under different operating conditions, a generator speed control mode is adopted at the beginning of both the first and second switching control strategies. This ensures that the actual torque of the generator remains constant while the actual torque of the engine changes. Maintaining a constant actual torque of the generator ensures stable power output during the initial stage of the switching control strategy, avoiding power fluctuations caused by sudden torque changes and thus maintaining the stability of the entire power system. Simultaneously, allowing the actual torque of the engine to adjust according to changes in the control strategy allows for flexible response to changes in the system's power demand. This control method ensures a smooth transition in power output while improving the system's response speed and flexibility, enabling the range extender to achieve more precise and efficient energy conversion and control under different operating conditions.

[0087] In some embodiments, to ensure the power response after the power generation switch, the second mapping relationship is configured as follows:

[0088]

[0089] In the formula, n is the target speed, η is the power generation efficiency, T is the target torque, P is the required power, and C is the proportional coefficient, which is generally 9550.

[0090] The proportional gain C is calculated based on the engine's characteristics and transmission system parameters to ensure that the relationship between the engine's output torque and the target speed and power demand matches actual operating requirements. With this configuration, when the power demand increases, the target torque increases accordingly to meet the system's power requirements. Conversely, when the target speed increases, the target torque decreases to avoid excessive mechanical stress damaging the engine and transmission system. This refined torque control strategy further improves the range extender's operating efficiency and stability under different operating conditions.

[0091] In some embodiments, the fourth mapping relationship is configured as follows:

[0092]

[0093] In some embodiments, in order to make the switching process of the range extender's power generation mode more accurate, the method further includes the following steps S80-S90.

[0094] Step S80: In response to an increase or decrease in power demand, generate first information to characterize the range extender's power generation entering a switching state.

[0095] Step S90: In response to the range extender's demand power no longer changing and the deviation between the generator's actual power output and the demand power being less than a preset power threshold, generate second information to characterize the end of the range extender's power output switching.

[0096] The first and second information are both used to record the system's adjustment process of the range extender's power generation. The triggering of step S80 indicates that the system has detected a change in power demand, which could be due to an increase in power demand caused by an increase in load or a decrease in power demand caused by a decrease in load. At this time, the system needs to adjust the range extender's power generation to adapt to the new demand, thus generating the first information to initiate the power generation switching process. Step S90, during the power generation adjustment process, generates the second information when the system detects that the power demand remains stable and the generator's actual power generation has approached or reached the power demand, with the deviation within a preset power threshold, indicating that the power generation switching process has been completed. These two steps together constitute a closed-loop control for the dynamic adjustment of the range extender's power generation, ensuring that the power generation can accurately and promptly respond to changes in load demand, thus improving the overall system's response speed and stability.

[0097] Figure 3 A flowchart illustrating an example of a power switching method provided in at least one embodiment of this disclosure. For example... Figure 3As shown, when the range extender's power demand increases, it enters the generator speed control mode. The generator's target speed changes according to the Pn table (where P is the power demand and n is the target speed), while simultaneously limiting the generator's torque to a minimum value. The minimum value is the generator's actual torque from the previous control cycle. When the power demand no longer changes and the deviation between the actual generated power and the power demand is less than the power threshold, the generator's torque minimum limit is released, and the engine's torque value returns to the value looked up from the PT table (where T is the target torque).

[0098] When the range extender's power demand decreases, it enters generator speed control mode. The generator's target speed changes according to the Pn table lookup, while the generator's torque is limited to a maximum value, which is the actual torque of the motor in the previous control cycle. When the power demand no longer changes and the deviation between the actual generated power and the demand power is less than the power threshold, the generator's maximum torque limit is released, and the engine torque returns to the PT table lookup value.

[0099] Figure 4 This is a structural block diagram of a power generation switching control system provided in at least one embodiment of the present disclosure. The system is applied to a range extender having an engine and a generator, and the range extender is equipped with a generator speed control mode. Figure 4 As shown, the power generation switching control system 1 of the range extender includes a data monitoring unit 11, a first control unit 12, and a second control unit 13.

[0100] The data monitoring unit 11 is configured to monitor the power demand of the range extender.

[0101] The first control unit 12 is configured to activate when the power demand increases, triggering its built-in first switching control strategy. This first switching control strategy is configured to activate a generator speed control mode, dynamically adjust the target generator speed in different control cycles under the generator speed control mode based on the power demand, and limit the minimum generator torque in each control cycle to be no less than the actual generator torque in the previous control cycle.

[0102] The second control unit 13 is configured to start when the demand power decreases and trigger its built-in second switching control strategy. The second switching control strategy is configured to start the generator speed control mode, dynamically adjust the target speed of the generator in different control cycles in the generator speed control mode based on the demand power, and limit the maximum torque of the generator in each control cycle to not be greater than the actual torque of the generator in the previous control cycle.

[0103] The specific execution methods of each unit in the above system embodiments have been described in detail in the embodiments related to the method, and will not be elaborated here.

[0104] In some embodiments, the data monitoring unit 11 can be implemented by a sensor, and the first control unit 12 and the second control unit 13 can be implemented by a controller or control module with corresponding programs.

[0105] This disclosure also provides a storage medium storing a program or instructions that, when executed by a processor, implement the steps of the method embodiments described above.

[0106] This disclosure also provides a program product, such as... Figure 5 As shown, the program product includes one or more processors 21 and memory 22. Figure 5 Take a processor 21 as an example.

[0107] The controller may also include an input device 23 and an output device 24.

[0108] The processor 21, memory 22, input device 23, and output device 24 can be connected via a bus or other means. Figure 5 Taking the example of a connection between China and Israel via a bus.

[0109] The processor 21 can be a central processing unit (CPU), or it can be other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, or combinations of the above types of chips. The general-purpose processor can be a microprocessor or any conventional processor.

[0110] The memory 22, as a non-transitory computer-readable storage medium, can be used to store non-transitory software programs, non-transitory computer-executable programs, and modules, such as the program instructions / modules corresponding to the methods in the embodiments of this disclosure. The processor 21 executes various functional applications and data processing of the server by running the non-transitory software programs, instructions, and modules stored in the memory 22, thereby implementing the steps of the above-described method embodiments.

[0111] The memory 22 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created by the use of the processing device operated by the server. Furthermore, the memory 22 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some embodiments, the memory 22 may optionally include memory remotely located relative to the processor 21, and these remote memories may be connected to a network connection device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0112] Input device 23 can receive input digital or character information, and generate key signal inputs related to driver settings and function control of the server's processing unit. Output device 24 may include display devices such as a display screen.

[0113] One or more modules are stored in memory 22, and when executed by one or more processors 21, they perform actions such as... Figure 1 The method shown.

[0114] Those skilled in the art will understand that all or part of the processes in the above method embodiments can be implemented by a computer program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, it can include the processes described in the above method embodiments. The storage medium can be a magnetic disk, optical disk, read-only memory (ROM), random access memory (RAM), flash memory (FM), hard disk drive (HDD), or solid-state drive (SSD), etc.; the storage medium can also include combinations of the above types of memory.

[0115] Although embodiments of the present disclosure have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the present disclosure, and such modifications and variations all fall within the scope defined by the appended claims.

[0116] Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions and variations to the above embodiments within the scope of the present disclosure.

Claims

1. A method for switching the power generation of a range extender, the range extender comprising an engine and a generator, and the range extender being equipped with a generator speed control mode, characterized in that, The method includes: Monitor the power demand of the range extender; When the power demand increases, a first switching control strategy is triggered, wherein the first switching control strategy is configured to activate the generator speed control mode, dynamically adjust the target speed of the generator in different control cycles under the generator speed control mode based on the power demand, and limit the minimum torque of the generator in each control cycle to be no less than the actual torque of the generator in the previous control cycle; and, When the required power decreases, a second switching control strategy is triggered. The second switching control strategy is configured to start the generator speed control mode, dynamically adjust the target speed of the generator in different control cycles under the generator speed control mode based on the required power, and limit the maximum torque of the generator in each control cycle to not be greater than the actual torque of the generator in the previous control cycle.

2. The method according to claim 1, characterized in that, The method further includes: After triggering the first switching control strategy or the second switching control strategy, the actual power generation of the generator in each control cycle is obtained; and, When the required power of the range extender no longer changes and the deviation between the actual power output of the generator and the required power is less than a preset power threshold, the torque limitation on the generator is lifted.

3. The method according to claim 1 or 2, characterized in that, The range extender is also equipped with an engine torque control mode, and the first switching control strategy includes: The generator speed control mode is activated, a first mapping relationship between the required power and the target speed is obtained, the target speed of the generator in each control cycle under the generator speed control mode is obtained based on the first mapping relationship, the generator speed is adjusted based on the target speed, and the minimum torque of the generator in each control cycle is limited to be no less than the actual torque of the generator in the previous control cycle; and, The engine torque control mode is activated, and a second mapping relationship is obtained between the target torque, the required power, and the actual speed of the generator. Based on the second mapping relationship, the target torque of the engine in each control cycle of the engine torque control mode is obtained, and torque control of the engine is performed based on the target torque.

4. The method according to claim 3, characterized in that, The second switching control strategy includes: The generator speed control mode is activated, and a third mapping relationship between the required power and the target speed is obtained. Based on the third mapping relationship, the target speed of the generator in each control cycle of the generator speed control mode is obtained. The generator speed is controlled based on the target speed, while limiting the maximum torque of the generator in each control cycle to not exceed the actual torque of the generator in the previous control cycle; and... The engine torque control mode is activated, and a fourth mapping relationship is obtained between the target torque, the demand power, and the actual speed of the generator when the demand power increases. Based on the fourth mapping relationship, the target torque of the engine in each control cycle of the engine torque control mode is obtained, and the engine torque is controlled based on the target torque.

5. The method according to claim 4, characterized in that, The method further includes: After triggering the first switching control strategy and the second switching control strategy and removing the torque limitation on the engine, the target torque of the engine is restored to the set torque that matches the current power demand.

6. The method according to claim 4, characterized in that, In the first and third mapping relationships, the target rotational speed is configured to be positively correlated with the required power; and in the second and fourth mapping relationships, the target torque is configured to be positively correlated with the required power and inversely correlated with the target rotational speed. In the initial stages of both the first and second switching control strategies, the generator speed control mode is used so that the actual torque of the generator remains unchanged while the actual torque of the engine changes.

7. The method according to claim 1 or 2, characterized in that, The method further includes: In response to an increase or decrease in power demand, first information is generated to characterize that the range extender's power generation has entered a switching state; and, In response to the range extender's power demand no longer changing and the deviation between the generator's actual power output and the power demand being less than a preset power threshold, second information is generated to characterize the end of the range extender's power output switching.

8. A power generation switching control system for a range extender, the range extender comprising an engine and a generator, and the range extender being equipped with a generator speed control mode, characterized in that, The system includes: A data monitoring unit is configured to monitor the power demand of the range extender; A first control unit is configured to activate when the power demand increases, triggering its built-in first switching control strategy. This first switching control strategy is configured to activate the generator speed control mode, dynamically adjust the target speed of the generator in different control cycles under the generator speed control mode based on the power demand, and limit the minimum torque of the generator in each control cycle to be no less than the actual torque of the generator in the previous control cycle; and... The second control unit is configured to start when the demand power decreases and trigger its built-in second switching control strategy. The second switching control strategy is configured to start the generator speed control mode, dynamically adjust the target speed of the generator in different control cycles under the generator speed control mode based on the demand power, and limit the maximum torque of the generator in each control cycle to not be greater than the actual torque of the generator in the previous control cycle.

9. A storage medium, characterized in that, The storage medium stores a program or instructions that, when executed by a processor, implement the steps of the method as described in any one of claims 1 to 7.

10. A program product comprising a program or instructions, characterized in that, When the program or instructions are executed by a processor, they implement the steps of the method as described in any one of claims 1 to 7.

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