Stable control method and system for prime mover speed, electronic device, storage medium

Abstract

The present invention discloses a method and system for stabilizing the speed of a prime mover, an electronic device, and a storage medium. After obtaining the change in the power demand of the load and the working state of the power battery, the method for stabilizing the speed of the prime mover can formulate a power adjustment strategy to adjust the power ratio of the power battery and the prime mover to meet the power demand of the load. By introducing the power battery into the power supply chain of the load, the power battery is fully utilized to smooth the peak and valley of the demand power of the load, which not only improves the power response speed, but also the power output of the prime mover is not completely driven by the load, but determined by the power demand of the load and the state of the power battery. The output power of the prime mover is no longer adjusted frequently according to the change in the power demand of the load, which is beneficial to the prime mover to maintain a stable speed and constant power, improves the economy of the system, and extends the service life of the prime mover.

Description

Technical Field

[0001] The present invention relates to the technical field of series aviation hybrid electric propulsion systems, and in particular, to a method and system for stabilizing the speed of a prime mover, an electronic device, and a computer-readable storage medium. Background Art

[0002] The configuration of a series aviation hybrid electric propulsion system is as Figure 1 shown. A turboprop engine drives a generator to generate electric energy. On the one hand, the electric energy is transmitted to a motor to be converted into mechanical energy for driving a ducted fan or a propeller. On the other hand, the electric energy is transmitted to a battery for storage, and the battery powers on-board devices. In order to maintain the power generation quality, the turboprop engine as the prime mover generally adopts a constant speed control strategy. When the load power increases, the engine speed will decrease. After the engine controller detects the decrease in the engine speed, it will increase the fuel supply to raise the engine speed to the target value. When the load power decreases, the engine speed increases. After the engine controller detects the increase in the speed, it will reduce the fuel supply to lower the engine speed to the target value. Therefore, the power output of the existing series aviation hybrid electric propulsion system is completely driven by the load. When the power demand of the aircraft changes violently, such as during landing and takeoff, diving and pulling up, emergency dispatch, takeoff interruption, encountering sudden airflow, etc., it is very easy to cause system instability, and the power of the turboprop engine as the prime mover changes violently, resulting in excessive speed overshoot, and in severe cases, it will trigger a protection shutdown. Summary of the Invention

[0003] The present invention provides a method and system for stabilizing the speed of a prime mover, an electronic device, and a computer-readable storage medium, so as to solve the technical problem of unstable prime mover speed caused by the existing series aviation hybrid electric system adopting a constant speed control strategy.

[0004] According to one aspect of the present invention, a method for stabilizing the speed of a prime mover, applicable to a series aviation hybrid electric propulsion system, includes the following steps:

[0005] Obtain the change in the power demand of the load;

[0006] Obtain the working state of the power battery;

[0007] Formulate a power adjustment strategy according to the change in the power demand of the load and the working state of the power battery, so as to adjust the power ratio of the power battery and the prime mover.

[0008] Further, the process of formulating a power adjustment strategy according to the change in the power demand of the load and the working state of the power battery is specifically as follows:

[0009] When the power of the power battery is between the second preset value and the first preset value, a battery priority adjustment strategy is adopted, and the output power of the power battery is adjusted correspondingly according to the change of the power demand of the load to keep the output power of the prime mover constant, where the first preset value is greater than the second preset value;

[0010] When the power of the power battery is between the third preset value and the second preset value, a balance adjustment strategy is adopted to adjust the power ratio of the power battery and the prime mover, where the second preset value is greater than the third preset value;

[0011] When the power of the power battery is between the fourth preset value and the third preset value, a prime mover priority adjustment strategy is adopted to adjust the power ratio of the power battery and the prime mover, where the third preset value is greater than the fourth preset value.

[0012] Further, the process of adopting the balance adjustment strategy to adjust the power ratio of the power battery and the prime mover is specifically as follows:

[0013] The power battery performs charge and discharge control with the goal of maintaining the power at the second preset value. When the power demand of the load increases, the charging power of the power battery is preferentially reduced. If the charging power of the power battery drops to 0 and still cannot meet the increased power of the load, the insufficient power is proportionally distributed between the power battery and the prime mover, increasing the output power of the prime mover while controlling the power battery to discharge; when the power demand of the load decreases, the charging power of the power battery is preferentially increased. If the charging power of the power battery increases to the maximum charging power and still cannot meet the reduced power of the load, the output power of the prime mover is reduced.

[0014] Further, the process of adopting the prime mover priority adjustment strategy to adjust the power ratio of the power battery and the prime mover is specifically as follows:

[0015] When the power demand of the load increases, the output power of the prime mover is increased to the maximum continuous state. If it still cannot meet the increased power of the load, the charging power of the power battery is reduced;

[0016] When the power demand of the load decreases, the charging power of the power battery is preferentially increased. If the charging power of the power battery increases to the maximum charging power and still cannot meet the reduced power of the load, the output power of the prime mover is further reduced.

[0017] Further, when the power demand of the load suddenly increases, while sending a command to the motor to increase speed and power, a transient pre-fueling command is sent to the prime mover; when the power demand of the load suddenly decreases, while sending a command to the motor to decrease speed and power, a transient pre-defueling command is sent to the prime mover.

[0018] Further, the following formula is used to calculate the transient pre-fueling amount or the transient pre-defueling amount:

[0019]

[0020] Among them, △F represents the instantaneous pre-fuel injection amount or instantaneous pre-fuel reduction amount of the prime mover, P(t) represents the power function of the prime mover, η(t) represents the fuel efficiency function of the prime mover, △t = t2 - t1 represents the time required for the power change of the prime mover, and C represents the calorific value of the fuel.

[0021] Furthermore, collect the rotational speed of the prime mover after the last instantaneous pre-fuel injection or instantaneous pre-fuel reduction, and calculate the instantaneous pre-fuel injection amount or instantaneous pre-fuel reduction amount of the prime mover when the power demand of the current load mutates based on the following formula:

[0022] △F′ = α△F

[0023] Among them, △F′ and △F respectively represent the corrected and uncorrected fuel supplement amount or fuel reduction amount, and α represents the correction coefficient. α n+1 and α n respectively represent the correction coefficients for the current correction and the previous correction. v1 represents the actual rotational speed of the prime mover at the end of the previous fuel supplement or fuel reduction, and v0 represents the target rotational speed of the prime mover during the previous power regulation.

[0024] In addition, the present invention also provides a prime mover rotational speed stable control system, which adopts the stable control method described above and includes:

[0025] A load power acquisition module for obtaining the change in the power demand of the load;

[0026] A battery state acquisition module for obtaining the working state of the power battery;

[0027] A power regulation module for formulating a power regulation strategy according to the change in the power demand of the load and the working state of the power battery to adjust the power ratio between the power battery and the prime mover.

[0028] In addition, the present invention also provides an electronic device, including a processor and a memory. A computer program is stored in the memory, and the processor is used to execute the steps of the method described above by calling the computer program stored in the memory.

[0029] In addition, the present invention also provides a computer-readable storage medium for storing a computer program for stably controlling the rotational speed of the prime mover. When the computer program runs on a computer, it executes the steps of the method described above.

[0030] The present invention has the following effects:

[0031] The method for stabilizing the rotational speed of the prime mover of the present invention can formulate a power adjustment strategy to adjust the power ratio of the power battery and the prime mover after obtaining the change in the power demand of the load and the operating state of the power battery, so as to meet the power demand of the load. By introducing the power battery into the power supply chain of the load and making full use of the power battery to cut peaks and fill valleys for the required power of the load, not only the power response speed is improved, but also the power output of the prime mover is not completely driven by the load, but determined by the power demand of the load and the state of the power battery. The output power of the prime mover is no longer adjusted frequently according to the change in the power demand of the load, which is beneficial to keeping the rotational speed of the prime mover stable and the power unchanged, improving the economy of the system, and prolonging the service life of the prime mover.

[0032] In addition, the stable control method of the present invention formulates different power adjustment strategies according to the state of charge of the power battery. When the power battery has sufficient power, only by adjusting the output power of the power battery can the change in the power demand of the load be met, and the rotational speed and power of the prime mover are maintained unchanged. When the power battery has relatively sufficient power, a strategy of balanced adjustment between the prime mover and the power battery is adopted. By controlling the power battery to switch between charge and discharge and controlling the charging power for auxiliary power adjustment, the output power of the prime mover fluctuates near the most efficient cruising power. When the power battery has insufficient power, a strategy of giving priority to the prime mover adjustment is adopted. By controlling the charging power of the power battery to meet the change in the power demand of the load, the output power of the engine is maintained at a high power state as much as possible. Therefore, while meeting the change in the power demand of the load, the power adjustment strategy of the present invention makes full use of the power battery to cut peaks and fill valleys, greatly reducing the power adjustment frequency of the prime mover, which is beneficial to improving the stability of the rotational speed of the prime mover.

[0033] In addition, when the power demand of the load suddenly changes, after calculating the required power change amount of the prime mover in combination with the power adjustment amount of the power battery, the fuel amount that the engine needs to supplement or reduce additionally is accurately estimated and instantaneously supplemented or subtracted as quickly as possible in a quantitative manner. After the fuel addition or subtraction is completed, the prime mover switches to the conventional control mode and continues to maintain the rotational speed stable, thereby improving the power response speed and rotational speed stability of the prime mover under extreme working conditions.

[0034] In addition, the rotational speed adjustment result after the previous fuel addition or subtraction is also collected, that is, the difference between the actual rotational speed and the target rotational speed of the prime mover after the fuel addition or subtraction. And a correction coefficient is introduced based on this difference to correct the fuel addition amount or subtraction amount calculated this time. After multiple instantaneous fuel additions or instantaneous fuel subtractions, the correction coefficient is iteratively calculated to continuously optimize the correction coefficient, making the actual rotational speed of the engine closer to the target control rotational speed after adjusting the fuel flow rate, and further improving the control stability of the rotational speed of the prime mover.

[0035] In addition, the prime mover speed stabilization control system of the present invention also has the above-mentioned advantages.

[0036] In addition to the purposes, features, and advantages described above, the present invention has other purposes, features, and advantages. The present invention will be further described in detail below with reference to the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] The drawings forming a part of this application are used to provide a further understanding of the present invention. The schematic embodiments and descriptions thereof of the present invention are used to explain the present invention and do not constitute an improper limitation to the present invention. In the drawings:

[0038] Figure 1 is a schematic configuration diagram of a series hybrid electric aircraft propulsion system.

[0039] Figure 2 is a schematic flowchart of the prime mover speed stabilization control method of the preferred embodiment of the present invention.

[0040] Figure 3 is a schematic diagram of the power characteristic curve of the prime mover in the preferred embodiment of the present invention.

[0041] Figure 4 is a schematic diagram of the module structure of the prime mover speed stabilization control system of another embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0042] The embodiments of the present invention will be described in detail below with reference to the drawings. However, the present invention can be implemented in many different ways defined and covered by the following.

[0043] It can be understood that as Figure 2 shown, the preferred embodiment of the present invention provides a prime mover speed stabilization control method applicable to a series hybrid electric aircraft propulsion system, including the following:

[0044] Step S1: Obtain the change in the power demand of the load;

[0045] Step S2: Obtain the working state of the power battery;

[0046] Step S3: Develop a power adjustment strategy based on the change in the power demand of the load and the working state of the power battery to adjust the power ratio between the power battery and the prime mover.

[0047] It can be understood that for the method of stabilizing the rotational speed of the prime mover in this embodiment, after obtaining the change in the power demand of the load and the working state of the power battery, a power adjustment strategy can be formulated to adjust the power ratio between the power battery and the prime mover to meet the power demand of the load. By introducing the power battery into the power supply chain of the load, the power battery is fully utilized to level the peaks and valleys of the demand power of the load. This not only improves the power response speed, but also the power output of the prime mover is not completely driven by the load, but is determined by the power demand of the load and the state of the power battery. The output power of the prime mover is no longer adjusted frequently according to the change in the power demand of the load, which is beneficial to keeping the rotational speed and power of the prime mover stable, improving the economy of the system, and extending the service life of the prime mover.

[0048] It can be understood that in step S1, the change in the power demand of each motor is specifically calculated according to the command of the control system, and then a command is issued to adjust the rotational speed or power of each motor.

[0049] It can be understood that in step S2, parameters such as the state of charge, current charging power, and battery temperature of the power battery are specifically collected through the battery management system.

[0050] It can be understood that in step S3, the process of formulating a power adjustment strategy based on the change in the power demand of the load and the working state of the power battery is specifically as follows:

[0051] When the state of charge of the power battery is between the second preset value and the first preset value, a battery-priority adjustment strategy is adopted. The output power of the power battery is adjusted correspondingly according to the change in the power demand of the load to maintain the output power of the prime mover constant, where the first preset value is greater than the second preset value;

[0052] When the state of charge of the power battery is between the third preset value and the second preset value, a balanced adjustment strategy is adopted to adjust the power ratio between the power battery and the prime mover, where the second preset value is greater than the third preset value;

[0053] When the state of charge of the power battery is between the fourth preset value and the third preset value, a prime-mover-priority adjustment strategy is adopted to adjust the power ratio between the power battery and the prime mover, where the third preset value is greater than the fourth preset value.

[0054] Specifically, when the state of charge of the power battery is between 60% and 100%, a battery-priority adjustment strategy is adopted to make full use of the power stored in the power battery. The prime mover maintains the most efficient cruising power, and the output power and rotational speed of the prime mover remain constant, improving the economy of the system. The increase or decrease in the power demand of the load is preferentially adjusted by the increase or decrease in the output power of the power battery. For example, when the power demand of the load increases, the output power of the power battery is correspondingly increased, and when the power demand of the load decreases, the output power of the power battery is correspondingly decreased.

[0055] When the power of the power battery is between 40% and 60%, a balance adjustment strategy is adopted, and it is necessary to comprehensively adjust the power of the power battery and the prime mover. Among them, the process of adjusting the power ratio of the power battery and the prime mover by adopting the balance adjustment strategy is specifically as follows:

[0056] The power battery conducts charge and discharge control with the goal of maintaining the power at 60%, while the output power of the prime mover fluctuates near the most efficient cruising power. When the power demand of the load increases, the charging power of the power battery is preferentially reduced. If the charging power of the power battery drops to 0 and still cannot meet the increased power of the load, the insufficient power is proportionally distributed between the power battery and the prime mover. While increasing the output power of the prime mover, the power battery discharge is controlled. Among them, this distribution ratio can be an equal division ratio or other ratios, which can be set according to actual needs; when the power demand of the load decreases, the charging power of the power battery is preferentially increased until the output power of the prime mover exceeds the set efficient interval. If the charging power of the power battery increases to the maximum charging power and still cannot meet the reduced power of the load, the output power of the prime mover is reduced.

[0057] When the power of the power battery is between 20% and 40%, a prime mover priority adjustment strategy is adopted, and the power is adjusted by adjusting the output power of the prime mover and the charging power of the power battery. Among them, when the power of the power battery is between 20% and 40%, in order to ensure that the power battery can supply power to the airborne equipment normally, at this time the power battery is in a charging state, and the output power of the prime mover is used for battery charging and driving the aircraft at the same time. Among them, the process of adjusting the power ratio of the power battery and the prime mover by adopting the prime mover priority adjustment strategy is specifically as follows:

[0058] When the power demand of the load increases, the output power of the prime mover is increased to the maximum continuous state. If it still cannot meet the increased power of the load, the charging power of the power battery is reduced; when the power demand of the load decreases, the charging power of the power battery is preferentially increased. If the charging power of the power battery increases to the maximum charging power and still cannot meet the reduced power of the load, the output power of the prime mover is reduced again.

[0059] It can be understood that the present invention formulates different power adjustment strategies according to the state of charge of the power battery. When the power battery is fully charged, only the output power of the power battery is adjusted to meet the changing power demand of the load, and the speed and power of the prime mover are maintained unchanged. When the power battery has a relatively sufficient charge, a strategy of balanced adjustment of the prime mover and the power battery is adopted. By controlling the power battery to switch between charge and discharge and controlling the charging power, auxiliary power adjustment is carried out, so that the output power of the prime mover fluctuates around the most efficient cruising power. When the power battery has insufficient power, a prime mover priority adjustment strategy is adopted. By controlling the charging power of the power battery to meet the changing power demand of the load, the output power of the engine is maintained as high as possible. Therefore, while meeting the changing power demand of the load, the power adjustment strategy of the present invention makes full use of the power battery to smooth out the peaks and valleys, greatly reducing the power adjustment frequency of the prime mover and facilitating the improvement of the stability of the prime mover speed.

[0060] In addition, the specific values of the first preset value, the second preset value, the third preset value, and the fourth preset value can be set according to actual needs and are not specifically limited herein.

[0061] Optionally, when the power demand of the load suddenly increases, such as during carrier landing and go-around, and the power battery still requires the prime mover to provide a large power increment after adjustment, which may cause a sudden drop in the prime mover speed, while sending a command to the motor to increase speed and power, a transient pre-fueling command is sent to the prime mover to prevent the prime mover from over-decelerating, thereby offsetting the impact of the sudden increase in load power on the prime mover speed drop and shortening the response time of the prime mover to the power demand. When the power demand of the load suddenly decreases, such as during takeoff interruption, and the power battery still requires the prime mover to provide a large power reduction after adjustment, which may cause a sudden increase in the prime mover speed, while sending a command to the motor to decrease speed and power, a transient pre-fuel reduction command is sent to the prime mover to prevent the prime mover from over-speeding.

[0062] It can be understood that when the power demand of the load suddenly changes, the conventional constant speed control strategy forms a closed-loop control for the fuel supply of the engine and the prime mover speed, and the control function is: △F = f(△V, P t , T), where F represents the fuel supply of the prime mover, V is the prime mover speed, and P t$P_0$ is the total inlet pressure of the prime mover, $T$ is the total inlet temperature of the prime mover, and $\Delta V$ is the difference between the current speed of the prime mover and the target control speed. When the current speed is lower than the target speed, $\Delta F>0$, the prime mover will increase the fuel supply, and the prime mover will speed up. When the current speed is higher than the target control speed, $\Delta F<0$, the prime mover will reduce the fuel supply, and the prime mover will slow down. Through repeated adjustment, a dynamic balance is formed. In the conventional control mode, in order to avoid excessive overshoot of the speed and prevent the engine from overheating or stalling, the engine's fuel increase and decrease tend to be conservative, resulting in $\Delta F$ having a relatively small maximum or minimum value, that is, the amount of fuel added or subtracted each time is small, resulting in a slow power response. In the present invention, when the power demand of the load changes suddenly, after calculating the required power change of the prime mover in combination with the power adjustment amount of the power battery, the fuel amount that the engine needs to supplement or reduce can be accurately estimated and instantaneously replenished or subtracted as quickly as possible in a quantitative manner. After the fuel replenishment or reduction is completed, the prime mover then switches to the conventional control mode to continue maintaining the speed stability, thereby improving the power response speed and speed stability of the prime mover under extreme conditions.

[0063] For example, as Figure 3 shown, taking the case where the prime mover needs to instantaneously replenish fuel to increase the output power as an example, when it is calculated that the output power of the prime mover needs to increase from $P_1$ to $P_2$, the time $\Delta t = t_2 - t_1$ required to increase the power is calculated according to the power characteristic curve of the prime mover, and then the instantaneous pre-fuel replenishment amount is calculated using the following formula:

[0064]

[0065] where $\Delta F$ represents the instantaneous pre-fuel replenishment amount of the prime mover, $P(t)$ represents the power function of the prime mover, $\eta(t)$ represents the fuel efficiency function of the prime mover, and $C$ represents the calorific value of the fuel. The power function and fuel efficiency function of the prime mover can be obtained by fitting the factory data or by fitting the actual working data of the prime mover.

[0066] In addition, when the prime mover needs to instantaneously reduce fuel, the calculation formula is the same as the above fuel replenishment formula, but the extreme value of the fuel reduction amount needs to be set to avoid engine stalling.

[0067] In addition, in order to further improve the fuel replenishment accuracy or fuel reduction accuracy, the present invention also collects the speed adjustment result after the previous fuel replenishment or fuel reduction, that is, the difference between the actual speed of the prime mover after fuel replenishment or fuel reduction and the target speed, and introduces a correction coefficient based on this difference to correct the fuel replenishment amount or fuel reduction amount calculated this time. Specifically, the speed of the prime mover after the previous instantaneous pre-fuel replenishment or instantaneous pre-fuel reduction is collected, and the instantaneous pre-fuel replenishment amount or instantaneous pre-fuel reduction amount of the prime mover when the power demand of the load changes suddenly this time is calculated based on the following formula:

[0068]

[0069] Wherein, △F′ and △F respectively represent the fuel replenishment amount or fuel reduction amount after and before correction, α represents the correction coefficient, α n+1 and α n respectively represent the correction coefficients for the current correction and the previous correction. The initial value of α is 1. v1 represents the actual speed of the prime mover at the end of the previous fuel replenishment or fuel reduction, and v0 represents the target speed of the prime mover during the previous power regulation. Through iterative calculation of the correction coefficient after multiple instantaneous fuel replenishments or instantaneous fuel reductions, the correction coefficient is continuously optimized, making the actual speed of the engine closer to the target control speed after adjusting the fuel flow, and further improving the control stability of the prime mover speed.

[0070] In addition, as Figure 4 shown, another embodiment of the present invention further provides a prime mover speed stabilization control system, preferably adopting the above-mentioned stabilization control method, including:

[0071] A load power acquisition module for obtaining the change in the power demand of the load;

[0072] A battery state acquisition module for obtaining the working state of the power battery;

[0073] A power regulation module for formulating a power regulation strategy according to the change in the power demand of the load and the working state of the power battery to adjust the power ratio between the power battery and the prime mover.

[0074] It can be understood that for the prime mover speed stabilization control system of this embodiment, after obtaining the change in the power demand of the load and the working state of the power battery, a power regulation strategy can be formulated to adjust the power ratio between the power battery and the prime mover to meet the power demand of the load. By introducing the power battery into the power supply chain of the load and making full use of the power battery to level the peak and valley of the load's demand power, not only the power response speed is improved, but also the power output of the prime mover is not completely driven by the load, but determined by the power demand of the load and the state of the power battery. The output power of the prime mover is no longer adjusted frequently according to the change in the power demand of the load, which is beneficial for the prime mover to maintain a stable speed and constant power, improves the economy of the system, and extends the service life of the prime mover.

[0075] In addition, another embodiment of the present invention further provides an electronic device, including a processor and a memory. A computer program is stored in the memory, and the processor is used to execute the steps of the above-mentioned method by calling the computer program stored in the memory.

[0076] In addition, another embodiment of the present invention further provides a computer-readable storage medium for storing a computer program for stably controlling the speed of the prime mover. When the computer program runs on a computer, it executes the steps of the method described above.

[0077] The forms of common computer-readable storage media include: floppy disks, flexible disks, hard disks, magnetic tapes, any other magnetic media, CD-ROMs, any other optical media, punch cards, paper tapes, any other physical media with a pattern of holes, random access memories (RAMs), programmable read-only memories (PROMs), erasable programmable read-only memories (EPROMs), flash erasable programmable read-only memories (FLASH-EPROMs), any other memory chips or cartridges, or any other media readable by a computer. The instructions can further be transmitted or received by a transmission medium. The term transmission medium can include any tangible or intangible medium that can be used to store, encode, or carry instructions for execution by a machine, and includes digital or analog communication signals or any other intangible medium that facilitates the communication of the above instructions. The transmission medium includes coaxial cables, copper wires, and optical fibers, which include the wires of a bus used to transmit a computer data signal.

[0078] The above are only the preferred embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

[0079] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk memories, CD-ROMs, optical memories, etc.) containing computer-usable program code. The solutions in the embodiments of the present application can be implemented in various computer languages. For example, object-oriented programming languages such as Java and interpreted scripting languages such as JavaScript.

[0080] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to the processors of general-purpose computers, special-purpose computers, embedded processors, or other programmable data processing devices to generate a machine, such that the instructions executed by the processors of the computer or other programmable data processing devices produce means for implementing the functions specified in one or more of the flows Figure 1 one or more of the flows and / or blocks Figure 1 or means for implementing the functions specified in one or more of the blocks.

[0081] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory produce a manufacture including instruction means for implementing the functions specified in one or more of the flows Figure 1 one or more of the flows and / or blocks Figure 1 or means for implementing the functions specified in one or more of the blocks.

[0082] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are executed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more of the flows Figure 1 one or more of the flows and / or blocks Figure 1 or means for implementing the functions specified in one or more of the blocks.

[0083] Although the preferred embodiments of the present application have been described, those skilled in the art can make additional changes and modifications once they learn the basic creative concepts. Therefore, the appended claims are intended to be construed as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0084] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalent technologies, the present application is also intended to include these changes and modifications.

Claims

1. A method for stabilizing the speed of a prime mover, applicable to a series hybrid electric aircraft propulsion system, characterized in that, It includes the following: Obtain the change in the power demand of the load; Obtain the working state of the power battery; Formulate a power regulation strategy based on the change in the power demand of the load and the working state of the power battery to adjust the power ratio of the power battery and the prime mover; The process of formulating the power regulation strategy according to the change in the power demand of the load and the working state of the power battery is specifically as follows: When the power of the power battery is between the second preset value and the first preset value, adopt the battery priority regulation strategy, and correspondingly adjust the output power of the power battery according to the change in the power demand of the load, and maintain the output power of the prime mover constant, where the first preset value is greater than the second preset value; When the power of the power battery is between the third preset value and the second preset value, adopt the balance regulation strategy to adjust the power ratio of the power battery and the prime mover, where the second preset value is greater than the third preset value; When the power of the power battery is between the fourth preset value and the third preset value, adopt the prime mover priority regulation strategy to adjust the power ratio of the power battery and the prime mover, where the third preset value is greater than the fourth preset value; The process of adopting the balance regulation strategy to adjust the power ratio of the power battery and the prime mover is specifically as follows: The power battery conducts charge and discharge control with the goal of maintaining the power at the second preset value. When the power demand of the load increases, the charging power of the power battery is preferentially reduced. If the charging power of the power battery drops to 0 and still cannot meet the increased power of the load, the insufficient power is proportionally distributed between the power battery and the prime mover, increasing the output power of the prime mover while controlling the power battery to discharge; when the power demand of the load decreases, the charging power of the power battery is preferentially increased. If the charging power of the power battery increases to the maximum charging power and still cannot meet the reduced power of the load, the output power of the prime mover is reduced; The process of adopting the prime mover priority regulation strategy to adjust the power ratio of the power battery and the prime mover is specifically as follows: When the power demand of the load increases, increase the output power of the prime mover to the maximum continuous state. If the increased power of the load still cannot be met, reduce the charging power of the power battery; When the power demand of the load decreases, preferentially increase the charging power of the power battery. If the charging power of the power battery increases to the maximum charging power and still cannot meet the reduced power of the load, then reduce the output power of the prime mover.

2. The stable control method for the prime mover speed as claimed in claim 1, wherein, When the power demand of the load suddenly increases, while sending a command to the motor to increase speed and power, send an instantaneous pre-fueling command to the prime mover; when the power demand of the load suddenly decreases, while sending a command to the motor to decrease speed and power, send an instantaneous pre-deceleration command to the prime mover.

3. The stable control method for the prime mover speed according to claim 2, characterized in that, Use the following formula to calculate the instantaneous pre-fueling amount or instantaneous pre-deceleration amount: where, ΔF represents the instantaneous pre-fueling amount or instantaneous pre-deceleration amount of the prime mover, P(t) represents the power function of the prime mover, η(t) represents the fuel efficiency function of the prime mover, Δt = t2 - t1 represents the time required for the power change of the prime mover, and C represents the calorific value of the fuel.

4. The stable control method for the prime mover speed according to claim 3, characterized in that, Collect the rotational speed of the prime mover after the last instantaneous pre-fueling or instantaneous pre-deceleration, and calculate the instantaneous pre-fueling amount or instantaneous pre-deceleration amount of the prime mover when the power demand of the current load mutates based on the following formula: ΔF′ = αΔF Among them, ΔF′ and ΔF respectively represent the fuel filling amount or fuel reduction amount after and before correction, and α represents the correction coefficient. α n+1 and α n respectively represent the correction coefficients for this correction and the previous correction. v1 represents the actual speed of the prime mover at the end of the previous fuel filling or fuel reduction, and v0 represents the target speed of the prime mover during the previous power regulation.

5. A stable control system for the rotational speed of a prime mover, which adopts the stable control method described in any one of claims 1 to 4, is characterized in that, It includes: The load power acquisition module is used to obtain the change in the power demand of the load; The battery state acquisition module is used to obtain the working state of the power battery; The power adjustment module is used to formulate a power adjustment strategy according to the change in the power demand of the load and the working state of the power battery, so as to adjust the power ratio of the power battery and the prime mover.

6. An electronic device, characterized in that, It includes a processor and a memory. A computer program is stored in the memory. The processor is used to execute the steps of the method according to any one of claims 1 to 4 by calling the computer program stored in the memory.

7. A computer-readable storage medium for storing a computer program for stably controlling the rotational speed of a prime mover, characterized in that, When the computer program runs on a computer, it executes the steps of the method according to any one of claims 1 to 4.

Images