A linear supercharger control method and system suitable for multiple working conditions

Abstract

The invention discloses a linear supercharger control method and system suitable for multiple working conditions, belonging to the field of mechanical control technology. The method comprises: obtaining design parameters and working parameters of the linear supercharger; setting the system working fluid type and output target; detecting the gas source state of the working environment of the linear supercharger; calculating the compression ratio of the linear supercharger according to the gas source pressure and the target exhaust pressure; determining the operation constraint of the linear supercharger according to the compression ratio of the linear supercharger, the maximum speed allowed by the motor and the target exhaust volume per unit time; calculating the optimal stroke and optimal frequency of the linear supercharger operation by combining the Lagrange duality method and the operation constraint of the linear supercharger; operating the linear supercharger with the optimal stroke and optimal frequency; monitoring whether the output target changes when the absolute value of the change of the gas source pressure is less than or equal to a preset threshold value, otherwise, recalculating the compression ratio; re-determining the output target when the output target changes, otherwise, continuing to operate.

Description

Technical Field

[0001] The present invention belongs to the technical field of mechanical control, and in particular relates to a linear supercharger control method and system suitable for multiple working conditions. Background Art

[0002] As a new type of supercharging device, the linear supercharger directly drives the piston to reciprocate through a linear motor to achieve the supercharging of the gas in the cylinder, and has a high energy conversion efficiency. The linear supercharger can steplessly change the piston stroke within the range allowed by the stroke to achieve different boost ratio outputs, and has potential adaptability to scenarios with a large range of gas source pressure changes and a wide range of boost pressure. At present, there is a lack of economical and effective linear compressor control methods under this potential practicality. The linear supercharger has the advantages of variable compression ratio, wide frequency domain adaptability, and variable flow rate. In order to broaden its application scenarios and its adaptability, its supporting multi-adaptive control method is urgently needed.

[0003] Traditional piston-type supercharging devices have a fixed boost ratio and limited adjustment capabilities. They have poor adaptability to changing working environments and are difficult to meet the requirements of wide compression ratio and wide flow rate control. They cannot ensure that the system outputs gas at a constant pressure. For some scenarios that require a wide range of boost pressure changes, traditional piston-type devices are also unable to meet the requirements. Summary of the invention

[0004] In order to solve the technical problems that the traditional piston-type supercharging device in the prior art has a fixed boost ratio, limited adjustment ability, poor adaptability to variable working environments, difficulty in meeting the requirements of wide compression ratio and wide flow rate control, and inability to ensure that the system outputs gas at a constant pressure, and the traditional piston-type device is also unable to meet the requirements for some scenarios requiring a wide range of boost pressure changes, the present invention provides a linear supercharger control method and system suitable for multiple working conditions.

[0005] First aspect

[0006] The present invention provides a linear supercharger control method applicable to multiple working conditions, comprising:

[0007] S101: Acquire design parameters and operating parameters of a linear supercharger, wherein the design parameters include: number of cylinders, cylinder diameter, and maximum design stroke, and the operating parameters include: maximum power of the supercharger, rated power of the supercharger, and maximum allowable speed of the motor;

[0008] S102: receiving a setting instruction, setting a system working fluid type and an output target, wherein the output target includes a target exhaust volume per unit time and a target exhaust pressure;

[0009] S103: Detecting the gas source state of the working environment of the linear supercharger, wherein the gas source state includes gas source temperature and gas source pressure;

[0010] S104: Calculating a compression ratio of the linear supercharger according to the gas source pressure and the target exhaust pressure;

[0011] S105: determining the operation constraints of the linear supercharger according to the compression ratio of the linear supercharger, the maximum allowable speed of the motor, and the target exhaust volume per unit time, wherein the operation constraints include: frequency constraints, stroke constraints, and power constraints;

[0012] S106: Calculate the optimal stroke and optimal frequency of the linear supercharger by combining the Lagrange duality method and the operation constraints of the linear supercharger;

[0013] S107: operating the linear supercharger at an optimal stroke and an optimal frequency;

[0014] S108: Determine whether the absolute value of the change in the gas source pressure is less than or equal to a preset threshold value. If the absolute value of the change in the gas source pressure is less than or equal to the preset threshold value, proceed to S109; otherwise, return to S104;

[0015] S109: Monitor whether the output target changes. If the output target changes, return to S102; otherwise, return to S107.

[0016] Second aspect

[0017] The present invention provides a linear supercharger control system applicable to multiple working conditions, comprising:

[0018] An acquisition module is used to acquire design parameters and operating parameters of a linear supercharger, wherein the design parameters include: number of cylinders, cylinder diameter, and maximum design stroke, and the operating parameters include: maximum power of the supercharger, rated power of the supercharger, and maximum allowable speed of the motor;

[0019] A receiving module, used to receive setting instructions, set the system working fluid type and output target, wherein the output target includes the exhaust volume per unit time and the target exhaust pressure;

[0020] A detection module, used to detect the gas source state of the working environment of the linear supercharger, wherein the gas source state includes the gas source temperature and the gas source pressure;

[0021] A first calculation module, used for calculating the compression ratio of the linear supercharger according to the gas source pressure and the target exhaust pressure;

[0022] A determination module determines the operation constraints of the linear supercharger according to the compression ratio of the linear supercharger, the maximum allowable speed of the motor and the target exhaust volume per unit time, wherein the operation constraints include: frequency constraints, stroke constraints and power constraints;

[0023] The second calculation module is used to calculate the optimal stroke and optimal frequency of the linear supercharger by combining the Lagrange duality method and the operation constraints of the linear supercharger;

[0024] An operation module for operating the linear supercharger at an optimal stroke and an optimal frequency;

[0025] A judgment module is used to judge whether the absolute value of the change in the gas source pressure is less than or equal to a preset threshold value. If the absolute value of the change in the gas source pressure is less than or equal to the preset threshold value, the process proceeds to S109; otherwise, the process returns to S104;

[0026] The monitoring module is used to monitor whether the output target changes. If the output target changes, it returns to S102, otherwise, it returns to S107.

[0027] Compared with the prior art, the present invention has at least the following beneficial effects:

[0028] In the present invention, based on the output target set by the user, and in combination with the detected working environment gas source state of the linear supercharger, the compression ratio of the linear supercharger is calculated, and then the operation constraints of the linear supercharger are determined. The optimal stroke and optimal frequency of the linear supercharger are calculated under the constraints of the operation constraints using the Lagrange dual method, which accelerates the convergence speed of the optimization, not only meets the output target set by the user, but also optimizes the operation efficiency of the linear supercharger to the greatest extent. During the operation of the linear supercharger, the operating state of the linear supercharger is adjusted in real time according to the real-time monitored change in the gas source pressure of the working environment of the linear supercharger and whether the output target of the user changes, thereby enhancing the adaptability of the linear supercharger to different operating environments. The user can adjust the output target steplessly to increase the output range of the linear supercharger. It meets the requirements of wide compression ratio and wide flow control, and can ensure that the system maintains a constant pressure gas output under the optimal operating state. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The preferred implementation modes will be described below in a clear and understandable manner with reference to the accompanying drawings to further illustrate the above-mentioned characteristics, technical features, advantages and implementation methods of the present invention.

[0030] Figure 1 It is a flow chart of a linear supercharger control method applicable to multiple working conditions provided by the present invention;

[0031] Figure 2 It is an operation trajectory curve of a linear supercharger when the output pressure changes provided by the present invention;

[0032] Figure 3 It is a structural schematic diagram of a linear supercharger control system applicable to multiple working conditions provided by the present invention; DETAILED DESCRIPTION

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the specific implementation methods of the present invention will be described below with reference to the accompanying drawings. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings and other implementation methods can be obtained based on these drawings without creative work.

[0034] In order to simplify the drawings, only the parts related to the invention are schematically shown in each figure, and they do not represent the actual structure of the product. In addition, in order to simplify the drawings and facilitate understanding, in some figures, only one of the parts with the same structure or function is schematically drawn or marked. In this article, "one" not only means "only one", but also means "more than one".

[0035] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0036] In this document, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0037] In addition, in the description of the present invention, the terms "first", "second", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0038] In one embodiment, the reference specification Figure 1 , a flow chart of a linear supercharger control method applicable to multiple working conditions provided by the present invention.

[0039] The present invention provides a linear supercharger control method applicable to multiple working conditions, comprising:

[0040] S101: Obtaining design parameters and operating parameters of a linear supercharger, wherein the design parameters include: number of cylinders, cylinder diameter, and maximum design stroke, and the operating parameters include: maximum power of the supercharger, rated power of the supercharger, and maximum allowable speed of the motor.

[0041] The linear supercharger includes a piston mover assembly disposed in a cylinder, a linear motor and free pistons arranged in an opposed manner, and the linear motor is gradually connected to the free piston through the piston mover.

[0042] It should be noted that the design parameters and operating parameters of the linear supercharger can be obtained based on the information provided by the manufacturer. The obtained parameter information is the basis for controlling the linear supercharger. Only when the design parameters and operating parameters of the linear supercharger are freely obtained can the operating constraints of the linear supercharger be calculated based on them to ensure the normal operation of the linear supercharger.

[0043] S102: receiving a setting instruction, setting the system working fluid type and output target, wherein the output target includes a target exhaust volume per unit time and a target exhaust pressure.

[0044] It should be noted that, for different system working fluid types, various gas parameters will change accordingly. Setting the system working fluid type can determine parameters such as the adiabatic index of the gas when the linear supercharger is running. In this case, the analysis of the linear supercharger is accurate and reliable, and it is avoided to ignore the system working fluid type and blindly optimize the linear supercharger. The set output target is the data that the user requires the linear supercharger to output when it is running. In actual use, the output target is not limited to the target exhaust volume per unit time and the target exhaust pressure. The user can set the output target according to actual needs.

[0045] S103: Detecting the gas source state of the working environment of the linear supercharger, wherein the gas source state includes gas source temperature and gas source pressure.

[0046] It is understandable that during the operation of the linear supercharger, it will be affected by external factors. Therefore, only by obtaining accurate gas source state data can the operation of the linear supercharger be better controlled in subsequent calculations.

[0047] In a possible implementation manner, S103 specifically includes:

[0048] S1031: Use the system temperature sensor to detect the gas source temperature, and use the pressure sensor to detect the gas source pressure.

[0049] S104: Calculate the compression ratio of the linear supercharger according to the gas source pressure and the target exhaust pressure.

[0050] In a possible implementation manner, S104 specifically includes:

[0051] S1041: Calculate the compression ratio ε of the linear supercharger according to the gas source pressure and the target exhaust pressure:

[0052]

[0053] Among them, P1 represents the gas source pressure, and P2 represents the target exhaust pressure.

[0054] It should be noted that the calculated compression ratio of the linear supercharger can determine the operating target of the linear supercharger. The compression ratio calculated based on meeting the user's requirements can be used as a constraint condition for subsequent calculations and participate in subsequent calculations, which is equivalent to connecting environmental changes and user output targets to the operation optimization process of the linear supercharger. In this case, the adaptability and sensitivity of this method to the environment are improved, and the calculation based on the compression ratio also meets the user's output target.

[0055] S105: Determine the operation constraints of the linear supercharger according to the compression ratio of the linear supercharger, the maximum allowable speed of the motor, and the target exhaust volume per unit time, wherein the operation constraints include: frequency constraints, stroke constraints, and power constraints.

[0056] It should be noted that when calculating the operation constraint of the linear supercharger, the compression ratio and the obtained design parameters and operation parameters of the linear supercharger are combined. Adjustment of the linear supercharger based on the operation constraint can ensure normal and safe operation of the linear supercharger.

[0057] In a possible implementation manner, S105 specifically includes:

[0058] S1051: Calculate the minimum stroke S of the linear supercharger based on the maximum design stroke, system fluid type and linear supercharger compression ratio. min .

[0059] In a possible implementation manner, S1051 specifically includes:

[0060] S1051A: Calculate the minimum stroke S of the linear supercharger based on the maximum design stroke and the compression ratio of the linear supercharger. min :

[0061]

[0062] Wherein, L represents the maximum design stroke, and k represents the system working fluid type, i.e., the adiabatic index of the gas.

[0063] It is understandable that the maximum design stroke of the linear supercharger can be determined due to structural limitations during design, but the minimum stroke is difficult to determine due to different gas adiabatic indexes caused by different system working fluid types during operation. Since the linear supercharger needs to meet the user's target needs, the determination of the minimum stroke is also limited by the compression ratio. The minimum stroke is calculated by combining the adiabatic index and the compression ratio to determine the operating range of the linear supercharger. In the subsequent calculation process, it is prevented that the operating stroke is less than the minimum stroke, resulting in equipment damage or failure to meet user needs.

[0064] S1052: Based on the maximum allowable speed of the motor, the minimum stroke and the maximum stroke of the linear supercharger, the frequency constraints of the linear supercharger under the condition of satisfying the speed limit and the stroke limit are calculated respectively:

[0065]

[0066] Where f is the operating frequency of the linear booster, V max represents the maximum speed allowed by the motor of the linear supercharger, S represents the stroke of the linear supercharger, and λ v represents the volume coefficient, λ t represents the temperature coefficient, λ l represents the leakage coefficient, λ p represents the pressure coefficient, q v It represents the air intake per unit time, and A represents the cylinder diameter of the linear supercharger.

[0067] S1053: Calculate the stroke constraint that satisfies the linear supercharger operating conditions:

[0068] S min ≤S≤L.

[0069] S1054: Calculate the power constraints of the linear supercharger:

[0070]

[0071] Among them, Q y =A*n*V*P1*f represents the displacement per unit time of n cylinders per unit time, where V represents the operating speed of the linear motor.

[0072] S106: Calculate the optimal stroke and optimal frequency of the linear supercharger by combining the Lagrange duality method and the operation constraints of the linear supercharger.

[0073] Among them, the Lagrange dual method is usually used to solve nonlinear programming problems for optimal utilization under limited resources. The Lagrange dual method starts from the conditions of the established operating constraints and formulates a specific programming strategy. It combines the dimensions of the problem and the variables therein, uses variables to replace the operating constraints, constructs a de facto new problem, and then solves the new problem to obtain the optimal value. The advantage of the Lagrange dual method is that it can solve multi-dimensional constrained optimal problems, in which the number of operating constraints can be arbitrary and does not need to be given in a specific form. The use of the Lagrange dual method can improve the convergence speed of the optimization process, improve the system's ability to respond quickly, meet the needs of real-time adjustment, and improve the operational agility of the linear supercharger.

[0074] In a possible implementation manner, S106 specifically includes:

[0075] S1061: According to the target exhaust volume per unit time, determine that the first optimization problem is that the exhaust volume per unit time of all cylinders reaches the target exhaust volume per unit time, that is, Q y =Q; or according to the target exhaust pressure, the second optimization problem is determined as the gas source pressure reaching the target exhaust pressure, that is, P1 = P2;

[0076] S1062: Establish a solution equation group for the first optimization problem or the second optimization problem according to the Lagrange dual method:

[0077]

[0078] Where α = Q y -Q or P1-P2;

[0079] S1063: Based on the solution of the equation group, construct the Lagrange multiplier function to eliminate the inequality constraints in the solution of the equation group:

[0080]

[0081] S1064: Calculate the optimal solution of the optimization problem at the saddle point of the Lagrange multiplier function, take the minimum value x and the maximum value μ, and establish the optimal solution condition equation:

[0082]

[0083] S1065: According to the optimal solution condition equation, the optimal stroke and optimal frequency are solved.

[0084] S107: Operate the linear supercharger at an optimal stroke and an optimal frequency.

[0085] It can be understood that the optimal stroke and optimal frequency obtained through optimization are obtained by combining the design parameters, operating parameters, system working fluid type, gas source status and user output targets of the linear supercharger. That is to say, when the linear supercharger operates at the calculated optimal stroke and optimal frequency, the operating restrictions of the equipment and the output targets of the user are met, and during the operation, the optimal stroke and optimal frequency can be adjusted in real time according to environmental changes, and quickly fed back to the linear supercharger to operate according to the results obtained by optimization, thereby avoiding the large rotational wear and unstable output targets of traditional superchargers, improving the operating efficiency and economic benefits of the linear supercharger, and achieving the preset output targets with the least operating resources.

[0086] S108: Determine whether the absolute value of the change in the gas source pressure is less than or equal to a preset threshold. If the absolute value of the change in the gas source pressure is less than or equal to the preset threshold, proceed to S109; otherwise, return to S104.

[0087] In actual use, those skilled in the art can adjust the preset threshold value according to actual needs, and this solution does not impose any limitation on the preset threshold value.

[0088] It should be noted that during the operation of the linear supercharger, the environment changes in real time. By judging the absolute value of the change in the air source pressure and the preset threshold in real time, it is determined whether the linear supercharger continues to operate or recalculates the compression ratio and then re-optimizes the operating state of the linear supercharger. In this case, the situation where the output target requirement cannot be met when the operating state of the supercharger remains unchanged due to changes in the environment is avoided, and the environmental adaptability of the linear supercharger is improved.

[0089] S109: Monitor whether the output target changes. If the output target changes, return to S102; otherwise, return to S107.

[0090] In actual use, monitor whether the output target changes to cope with the situation that the user may adjust the output target in real time due to actual needs. If the output target changes, re-receive the setting instructions, optimize, and adjust the operating state of the linear supercharger to meet the real-time changes of the user's output target, thereby improving the adaptability and output range of the linear supercharger. If the output target is not changed, continue to operate the linear supercharger with the optimal stroke and optimal frequency obtained by the current optimization. During the operation, real-time monitoring keeps the operating efficiency of the linear supercharger at the best state, and the control is simple and convenient with high economic benefits.

[0091] Refer to the instruction manual Figure 2 , the present invention provides an operating trajectory curve of a linear supercharger when the output pressure changes.

[0092] Depend on Figure 2 It can be seen that when the target exhaust pressure changes, the unique trajectory of the linear supercharger adjusts the displacement trajectory according to the target exhaust pressure in a very short time, has a fast real-time response, and can adapt to a larger target exhaust pressure and a wider target exhaust pressure variation range.

[0093] In actual use, the time and size of the target exhaust pressure change are given: the initial target exhaust pressure is 4Mpa, when the time is 1s, the target exhaust pressure is 8Mpa, the adiabatic index k under the current system working fluid type is 1.33, and the optimal stroke of the linear supercharger at the initial moment is calculated to be 7.256, and the optimal frequency is 24Hz; when the target exhaust pressure changes, the optimal stroke is 9.589 and the optimal frequency is 20Hz by re-establishing the constraint optimization. When the target exhaust pressure changes, the system will control the linear supercharger, thereby changing the trajectory at the starting point of the next cycle of the piston movement of the linear supercharger. Therefore, when the output target changes, the linear supercharger can be adjusted in a short time, and has a fast response speed when adapting to large pressure or flow changes.

[0094] Compared with the prior art, the present invention has at least the following beneficial effects:

[0095] In the present invention, based on the output target set by the user, and in combination with the detected working environment gas source state of the linear supercharger, the compression ratio of the linear supercharger is calculated, and then the operation constraints of the linear supercharger are determined. The optimal stroke and optimal frequency of the linear supercharger are calculated under the constraints of the operation constraints using the Lagrange dual method, which accelerates the convergence speed of the optimization, can not only meet the output target set by the user, but also optimize the operation efficiency of the linear supercharger to the greatest extent. During the operation of the linear supercharger, the operating state of the linear supercharger is adjusted in real time according to the real-time monitored change in the gas source pressure of the working environment of the linear supercharger and whether the output target of the user changes, so as to enhance the adaptability of the linear supercharger to different operating environments. The user can adjust the output target steplessly and increase the output range of the linear supercharger. It meets the requirements of wide compression ratio and wide flow control, and can ensure that the system maintains a constant pressure gas output under the optimal operating state.

[0096] Example 2

[0097] In one embodiment, the reference specification Figure 3 , a schematic structural diagram of a linear supercharger control system suitable for multiple working conditions provided by the present invention.

[0098] The present invention provides a linear supercharger control system 20 suitable for multiple working conditions, comprising:

[0099] The acquisition module 201 is used to acquire the design parameters and working parameters of the linear supercharger, wherein the design parameters include: the number of cylinders, the cylinder diameter, and the maximum design stroke; the working parameters include: the maximum power of the supercharger, the rated power of the supercharger, and the maximum allowable speed of the motor;

[0100] The receiving module 202 is used to receive a setting instruction, set the system working fluid type and output target, wherein the output target includes a target exhaust volume per unit time and a target exhaust pressure;

[0101] A detection module 203 is used to detect the gas source state of the working environment of the linear supercharger, wherein the gas source state includes the gas source temperature and the gas source pressure;

[0102] A first calculation module 204, for calculating a compression ratio of the linear supercharger according to the gas source pressure and the target exhaust pressure;

[0103] The determination module 205 determines the operation constraints of the linear supercharger according to the compression ratio of the linear supercharger, the maximum allowable speed of the motor and the target exhaust volume per unit time, wherein the operation constraints include: frequency constraints, stroke constraints and power constraints;

[0104] A second calculation module 206 is used to calculate the optimal stroke and optimal frequency of the linear supercharger by combining the Lagrange duality method and the operation constraints of the linear supercharger;

[0105] An operation module 207, configured to operate the linear supercharger at an optimal stroke and an optimal frequency;

[0106] The judging module 208 is used to judge whether the absolute value of the change in the gas source pressure is less than or equal to a preset threshold value. If the absolute value of the change in the gas source pressure is less than or equal to the preset threshold value, the process proceeds to S109; otherwise, the process returns to S104;

[0107] The monitoring module 209 is used to monitor whether the output target changes. If the output target changes, the module returns to S102; otherwise, the module returns to S107.

[0108] In a possible implementation, the detection module 203 specifically includes:

[0109] The detection submodule is used to detect the gas source temperature using the system temperature sensor and to detect the gas source pressure using the pressure sensor.

[0110] In a possible implementation, the first calculation module 204 specifically includes:

[0111] The first calculation submodule is used to calculate the compression ratio ε of the linear supercharger according to the gas source pressure and the target exhaust pressure:

[0112]

[0113] Among them, P1 represents the gas source pressure and P2 represents the exhaust pressure.

[0114] In a possible implementation, the determination module 205 specifically includes:

[0115] The second calculation submodule is used to calculate the minimum stroke S of the linear supercharger according to the maximum design stroke, the system working fluid type and the compression ratio of the linear supercharger. min ;

[0116] The third calculation submodule is used to calculate the frequency constraints of the linear supercharger under the condition of satisfying the speed limit and the stroke limit according to the maximum speed allowed by the motor, the minimum stroke and the maximum stroke of the linear supercharger:

[0117]

[0118] Where f is the operating frequency of the linear booster, V max represents the maximum speed allowed by the motor of the linear supercharger, S represents the stroke of the linear supercharger, and λ v represents the volume coefficient, λ t represents the temperature coefficient, λ l represents the leakage coefficient, λ p represents the pressure coefficient, q v It represents the air intake per unit time, and A represents the cylinder diameter of the linear supercharger;

[0119] The fourth calculation submodule is used to calculate the stroke constraint that satisfies the linear supercharger operating conditions:

[0120] S min ≤S≤L;

[0121] The fifth calculation submodule is used to calculate the power constraint of the linear supercharger:

[0122]

[0123] Among them, Q y =A*n*V*P1*f represents the displacement per unit time of n cylinders per unit time, where V represents the operating speed of the linear motor.

[0124] In a possible implementation, the second calculation submodule specifically includes:

[0125] The calculation subunit is used to calculate the minimum stroke S of the linear supercharger according to the maximum design stroke and the compression ratio of the linear supercharger. min :

[0126]

[0127] Wherein, L represents the maximum design stroke, and k represents the system working fluid type, i.e., the adiabatic index of the gas.

[0128] In a possible implementation, the second calculation module 206 specifically includes:

[0129] The determination submodule is used to determine the first optimization problem according to the target exhaust volume per unit time, that is, Q y =Q; or according to the target exhaust pressure, the second optimization problem is determined as the gas source pressure reaching the target exhaust pressure, that is, P1 = P2;

[0130] A submodule is established to establish a solution equation system for the first optimization problem or the second optimization problem according to the Lagrange dual method:

[0131]

[0132] Where α = Q y -Q or P1-P2;

[0133] The construction submodule is used to construct the Lagrange multiplier function according to the solution of the equation group and eliminate the inequality constraints in the solution of the equation group:

[0134]

[0135] The sixth calculation submodule is used to calculate the optimal solution of the optimization problem at the saddle point of the Lagrange multiplier function, take the minimum value x and the maximum value μ, and establish the optimal solution condition equation:

[0136]

[0137] The solving submodule is used to solve the optimal stroke and optimal frequency according to the optimal solution condition equation.

[0138] The virtual system provided by the present invention may be a system, or a component, an integrated circuit, or a chip in a terminal.

[0139] Compared with the prior art, the present invention has at least the following beneficial effects:

[0140] In the present invention, based on the output target set by the user, and in combination with the detected working environment gas source state of the linear supercharger, the compression ratio of the linear supercharger is calculated, and then the operation constraints of the linear supercharger are determined. The optimal stroke and optimal frequency of the linear supercharger are calculated under the constraints of the operation constraints using the Lagrange dual method, which accelerates the convergence speed of the optimization, can not only meet the output target set by the user, but also optimize the operation efficiency of the linear supercharger to the greatest extent. During the operation of the linear supercharger, the operating state of the linear supercharger is adjusted in real time according to the real-time monitored change in the gas source pressure of the working environment of the linear supercharger and whether the output target of the user changes, so as to enhance the adaptability of the linear supercharger to different operating environments. The user can adjust the output target steplessly and increase the output range of the linear supercharger. It meets the requirements of wide compression ratio and wide flow control, and can ensure that the system maintains a constant pressure gas output under the optimal operating state.

[0141] The technical features of the above embodiments may be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0142] The above embodiments only express several implementation methods of the present invention, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the invention patent. It should be pointed out that, for those of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present invention, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the attached claims.

Claims

1. A linear supercharger control method suitable for multiple working conditions, characterized in that: include: S101: Acquire design parameters and operating parameters of the linear supercharger, wherein the design parameters include: number of cylinders, cylinder diameter, and maximum design stroke, and the operating parameters include: maximum power of the supercharger, rated power of the supercharger, and maximum allowable speed of the motor; S102: receiving a setting instruction, setting a system working fluid type and an output target, wherein the output target includes a target exhaust volume per unit time and a target exhaust pressure; S103: Detecting the gas source state of the working environment of the linear supercharger, wherein the gas source state includes gas source temperature and gas source pressure; S104: Calculating a compression ratio of the linear supercharger according to the gas source pressure and the target exhaust pressure; S105: determining the operation constraints of the linear supercharger according to the compression ratio of the linear supercharger, the maximum allowable speed of the motor and the target exhaust volume per unit time, wherein the operation constraints include: frequency constraints, stroke constraints and power constraints; S106: Calculating the optimal stroke and optimal frequency of the linear supercharger by combining the Lagrangian duality method and the operation constraints of the linear supercharger; S107: operating the linear supercharger at the optimal stroke and the optimal frequency; S108: Determine whether the absolute value of the change in the gas source pressure is less than or equal to a preset threshold value. If the absolute value of the change in the gas source pressure is less than or equal to the preset threshold value, proceed to S109; otherwise, return to S104; S109: Monitor whether the output target changes. If the output target changes, return to S102; otherwise, return to S107.

2. The linear supercharger control method according to claim 1, characterized in that: The S103 is specifically: S1031: Detect the temperature of the gas source using a system temperature sensor, and detect the pressure of the gas source using a pressure sensor.

3. The linear supercharger control method according to claim 1, characterized in that: The S104 is specifically as follows: S1041: Calculate the compression ratio ε of the linear supercharger according to the gas source pressure and the target exhaust pressure: Wherein, P1 represents the gas source pressure, and P2 represents the target exhaust pressure.

4. The linear supercharger control method according to claim 1, characterized in that: The S105 specifically includes: S1051: Calculate the minimum stroke S of the linear supercharger according to the maximum design stroke, the system working fluid type and the compression ratio of the linear supercharger. min ; S1052: According to the maximum allowable speed of the motor, the minimum stroke and the maximum stroke of the linear supercharger, the frequency constraint of the linear supercharger under the condition of satisfying the speed limit and the stroke limit is calculated respectively: Wherein, f represents the operating frequency of the linear booster, V max represents the maximum speed allowed by the motor of the linear supercharger, S represents the stroke of the linear supercharger, λv represents the volume coefficient, λ t represents the temperature coefficient, λl represents the leakage coefficient, λ p represents the pressure coefficient, q v represents the air intake per unit time, and A represents the cylinder diameter of the linear supercharger; S1053: Calculate the stroke constraint that satisfies the linear supercharger operating condition: S min ≤S≤L; S1054: Calculate the power constraint of the linear supercharger: Among them, Q y =A*n*V*P1*f represents the displacement per unit time of the n cylinders per unit time, wherein V represents the operating speed of the linear motor.

5. The linear supercharger control method according to claim 4, characterized in that: The S1051 is specifically: S1051A: Calculate the minimum stroke S of the linear supercharger according to the maximum design stroke and the compression ratio of the linear supercharger. min : Wherein, L represents the maximum design stroke, and k represents the adiabatic index of the system working fluid type, i.e., gas.

6. The linear supercharger control method according to claim 1, characterized in that: The S106 specifically includes: S1061: According to the target exhaust volume per unit time, determine that the first optimization problem is that the exhaust volume per unit time of all the cylinders reaches the target exhaust volume per unit time, that is, Q y =Q; or according to the target exhaust pressure, determining the second optimization problem is that the gas source pressure reaches the target exhaust pressure, that is, P1=P2; S1062: Establish a solution equation group for the first optimization problem or the second optimization problem according to the Lagrange dual method: Where α = Q y -Q or P1-P2; S1063: According to the solution equation group, construct a Lagrange multiplier function to eliminate the inequality constraints in the solution equation group: S1064: Calculate the optimal solution of the optimization problem at the saddle point of the Lagrange multiplier function, take the minimum value x and the maximum value μ, and establish the optimal solution condition equation: S1065: According to the optimal solution condition equation, solve the optimal stroke and the optimal frequency.

7. A linear supercharger control system suitable for multiple working conditions, characterized in that: include: An acquisition module, used to acquire design parameters and operating parameters of the linear supercharger, wherein the design parameters include: number of cylinders, cylinder diameter, and maximum design stroke, and the operating parameters include: maximum power of the supercharger, rated power of the supercharger, and maximum allowable speed of the motor; A receiving module, used to receive a setting instruction, set the system working fluid type and output target, wherein the output target includes a target exhaust volume per unit time and a target exhaust pressure; A detection module, used to detect the gas source state of the working environment of the linear supercharger, wherein the gas source state includes gas source temperature and gas source pressure; A first calculation module, configured to calculate a compression ratio of the linear supercharger according to the gas source pressure and the target exhaust pressure; A determination module, which determines the operation constraints of the linear supercharger according to the compression ratio of the linear supercharger, the maximum allowable speed of the motor and the target exhaust volume per unit time, wherein the operation constraints include: frequency constraints, stroke constraints and power constraints; A second calculation module, configured to calculate an optimal stroke and an optimal frequency of the linear supercharger by combining a Lagrange duality method and an operation constraint of the linear supercharger; an operating module, configured to operate the linear supercharger at the optimal stroke and the optimal frequency; A judging module, used to judge whether the absolute value of the change in the gas source pressure is less than or equal to a preset threshold value, and if the absolute value of the change in the gas source pressure is less than or equal to the preset threshold value, enter S109, otherwise, return to S104; The monitoring module is used to monitor whether the output target changes. If the output target changes, the module returns to S102; otherwise, the module returns to S107.

8. The linear supercharger control system according to claim 7, characterized in that: The detection module specifically includes: The detection submodule is used to detect the temperature of the gas source using a system temperature sensor and to detect the pressure of the gas source using a pressure sensor.

9. The linear supercharger control system according to claim 7, characterized in that: The first calculation module specifically includes: The first calculation submodule is used to calculate the compression ratio ε of the linear supercharger according to the gas source pressure and the target exhaust pressure: Wherein, P1 represents the gas source pressure, and P2 represents the exhaust pressure.

10. The linear supercharger control system according to claim 7, characterized in that: The determination module specifically includes: The second calculation submodule is used to calculate the minimum stroke S of the linear supercharger according to the maximum design stroke, the system working fluid type and the compression ratio of the linear supercharger. min ; The third calculation submodule is used to calculate the frequency constraint of the linear supercharger under the condition of satisfying the speed limit and the stroke limit according to the maximum allowable speed of the motor, the minimum stroke and the maximum stroke of the linear supercharger: Wherein, f represents the operating frequency of the linear booster, V max represents the maximum speed allowed by the motor of the linear supercharger, S represents the stroke of the linear supercharger, λv represents the volume coefficient, λ t represents the temperature coefficient, λl represents the leakage coefficient, λ p represents the pressure coefficient, q v represents the air intake per unit time, and A represents the cylinder diameter of the linear supercharger; The fourth calculation submodule is used to calculate the stroke constraint that satisfies the operating condition of the linear supercharger: S min ≤S≤L; The fifth calculation submodule is used to calculate the power constraint of the linear supercharger: Among them, Q y =A*n*V*P1*f represents the displacement per unit time of the n cylinders per unit time, wherein V represents the operating speed of the linear motor.

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