A free piston generator system equipped with a flexible stiffness vibration reduction mechanism

Abstract

This invention provides a free piston generator system equipped with a flexible stiffness damping mechanism, relating to the field of piston generator technology. The system includes: a linear motor, a free piston engine, a flexible stiffness damping mechanism, an operating condition identification module, and a control system. The control system receives and processes information from the operating condition identification module, assesses whether intervention via the flexible stiffness damping mechanism is necessary, and controls the flexible stiffness damping mechanism when intervention is required. The flexible stiffness damping mechanism includes: a connecting rod, a limit block, a stiffness spring, a servo positioning mechanism, and a servo motor. The control system is connected to the servo motor, and the limit block is fastened to the connecting rod by bolts. The stiffness spring is connected to the limit block and the servo positioning mechanism, and is constrained between the limit block and the servo positioning mechanism. The servo positioning mechanism is arranged on a guide rail between the linear motor and the free piston engine, driven and positioned by the servo motor to constrain the stiffness spring to a specific length.

Description

Technical Field

[0001] This invention relates to the field of piston generator technology, and in particular to a free piston generator system equipped with a flexible stiffness damping mechanism. Background Art

[0002] With the increasing severity of environmental pollution and energy shortages, conventional internal combustion engines can no longer meet people's daily needs. Therefore, researchers have begun to develop and improve new hybrid power systems and related technologies. Free-piston generators, on the other hand, possess potential theoretical advantages such as high thermal efficiency, high power per unit volume, ease of modularization, and low pollutant emissions. They can be applied to pure electric range extension, hybrid power, and other power applications, demonstrating significant application value and potential.

[0003] Unlike traditional internal combustion generators, the free-piston generator, a novel power unit that eliminates the need for a crankshaft connecting rod mechanism and camshaft valve train in a traditional internal combustion engine, combines a free-piston engine with a linear motor. The piston performs only reciprocating linear motion, avoiding the significant frictional losses between the piston and cylinder wall caused by the crankshaft connecting rod mechanism, as well as the substantial mechanical losses caused by numerous moving parts. Furthermore, due to its adjustable compression ratio and simple structure, it can adapt to various fuels and achieve optimal performance under most operating conditions.

[0004] Most current free-piston generators employ a two-stroke cycle. Due to their unique piston movement and engagement mechanism, the piston's motion characteristics depend entirely on the forces acting upon it during continuous operation. Therefore, free-piston generators are more prone to instability than traditional internal combustion engines. Instability can significantly impact the overall efficiency and operational stability of the free-piston generator, posing substantial safety hazards. For example, if combustion is unstable in one cylinder of a free-piston generator, without external intervention, the resulting vibrations or cyclic fluctuations can easily lead to misfires or even generator shutdown in the other cylinder due to insufficient cylinder pressure or piston position. Alternatively, malfunctions in the ignition or fuel injection systems of one free-piston generator can result in no ignition, no fuel injection, or insufficient fuel injection, further reducing the generator's operational stability. Summary of the Invention

[0005] To address the technical problem that existing free piston generators are prone to instability, affecting their overall efficiency and operational stability, and posing significant safety hazards, this invention provides a free piston generator system equipped with a flexible stiffness damping mechanism.

[0006] The technical solutions provided by the embodiments of the present invention are as follows:

[0007] The present invention provides a free piston generator system equipped with a flexible stiffness damping mechanism, comprising: a linear motor, a free piston engine, a flexible stiffness damping mechanism, an operating condition identification module, and a control system;

[0008] The free piston engine is connected to the linear motor;

[0009] Both the free piston engine and the linear motor are connected to the operating condition identification module.

[0010] The operating condition identification module is used to automatically identify the current operating condition of the free piston generator system and upload it to the control system;

[0011] The control system is used to receive and process the information from the operating condition identification module, assess whether intervention is needed through the flexible stiffness damping mechanism, and control the flexible stiffness damping mechanism when intervention is needed.

[0012] The flexible stiffness damping mechanism includes: a connecting rod, a limiting block, a stiffness spring, a servo positioning mechanism, and a servo motor; the control system is connected to the servo motor, and the limiting block is fastened to the connecting rod by bolts; the stiffness spring is connected to the limiting block and the servo positioning mechanism, and is confined between the limiting block and the servo positioning mechanism, for absorbing the chemical energy of combustion in the cylinder during the expansion stroke and releasing the stored elastic potential energy during the compression stroke; the servo positioning mechanism is arranged on the guide rail between the linear motor and the free piston engine, driven and positioned by the servo motor to limit the stiffness spring to a specific length, thereby achieving flexible control.

[0013] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following:

[0014] In this invention, a flexible stiffness damping mechanism is provided between the linear motor and the free piston engine. This mechanism can automatically determine whether the engine is in an unstable operating condition and can be modified according to different operating conditions. Under normal operating conditions, the flexible stiffness damping mechanism can improve the isochoricity of the compression stroke, thereby improving thermal efficiency, and absorb and store excess energy during the power stroke, which helps to reduce cycle fluctuations. Under unstable operating conditions, the flexible stiffness damping mechanism can reduce the impact of excessively high burst pressure on the free piston generator system, allowing the free piston generator system to return to normal operating conditions. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 A schematic diagram of a free piston generator system equipped with a flexible stiffness damping mechanism is provided for an embodiment of the present invention;

[0017] Figure 2 A schematic diagram illustrating the working principle of a free piston generator system equipped with a flexible stiffness damping mechanism under normal operating conditions, provided in an embodiment of the present invention;

[0018] Figure 3 This is a schematic diagram illustrating the working principle of a free piston generator system equipped with a flexible stiffness damping mechanism under unstable operating conditions, as provided in an embodiment of the present invention.

[0019] [Figure Labels]

[0020] 1. Cylinder pressure sensor; 2. Spark plug; 3. Direct injection injector; 4. Cylinder head; 5. Engine block; 6. Air-cooled fins; 7. Exhaust port in scavenging area; 8. Piston; 9. First piston ring - oil scraper ring; 10. Second piston ring - compression ring; 11. Piston pin; 12. Intake port in scavenging area; 13. Connecting rod; 14. Limit block; 15. Stiffness spring; 16. Motion guide rail; 17. Positioning mechanism; 18. Servo motor; 19. Linear motor housing; 20. Linear motor guide groove; 21. Linear motor coil winding; 22. Linear motor mover; 23. Mover displacement sensor; 24. Subsystem signal acquisition line; 25. Signal transmission line; 26. Information processing unit; 27. Control unit; 28. Host computer.

[0021] As shown in the figure, specific structures and devices are marked in the figure to clearly illustrate the structure of the embodiments of the present invention. However, this is only for illustrative purposes and is not intended to limit the present invention to this specific structure, device and environment. Those skilled in the art can adjust or modify these devices and environments according to specific needs. Detailed Implementation

[0022] The technical solutions of the present invention will now be described with reference to the accompanying drawings. It should also be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments. For some well-known technologies, those skilled in the art can also use other alternative methods to implement the invention; moreover, the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit the present invention.

[0023] It should be noted that the use of terms such as "an embodiment," "an embodiment," "an exemplary embodiment," and "some embodiments" in the specification indicates that the described embodiment may include a specific feature, structure, or characteristic, but not every embodiment necessarily includes that specific feature, structure, or characteristic. Furthermore, when a specific feature, structure, or characteristic is described in connection with an embodiment, implementing such a feature, structure, or characteristic in conjunction with other embodiments (whether explicitly described or not) should be within the knowledge of those skilled in the art.

[0024] Generally, terms can be understood at least partly from their use in context. For example, depending at least partly on the context, the term "one or more" as used herein can be used to describe any feature, structure, or characteristic in a singular sense, or a combination of features, structures, or characteristics in a plural sense. Additionally, the term "based on" can be understood not necessarily to convey an exclusive set of factors, but rather, alternatively, depending at least partly on the context, to allow for the presence of other factors that are not necessarily explicitly described.

[0025] It is understood that the meanings of “on”, “above”, and “above” in this invention should be interpreted in the broadest manner, such that “on” means not only “directly on” something, but also includes the meaning of being “on” something with an intervening feature or layer, and that “above” or “above” means not only “on” something, but also includes the meaning of being “on” something without an intervening feature or layer.

[0026] Furthermore, spatially related terms such as “below,” “under,” “lower,” “above,” and “upper” are used herein for convenience to describe the relationship of one element or feature to one or more other elements or features, as illustrated in the accompanying drawings. Spatially related terms are intended to cover different orientations in the use or operation of the device other than those depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially related descriptive terms used herein can be interpreted similarly.

[0027] Reference manual attached Figure 1 The diagram shows a structural schematic of a free piston generator system equipped with a flexible stiffness damping mechanism according to an embodiment of the present invention.

[0028] An embodiment of the present invention provides a free piston generator system equipped with a flexible stiffness damping mechanism, comprising: a linear motor, a free piston engine, a flexible stiffness damping mechanism, an operating condition identification module, and a control system.

[0029] The free-piston generator is connected to a linear motor. Both the free-piston generator and the linear motor are connected to an operating condition identification module. The operating condition identification module automatically identifies the current operating condition of the free-piston generator system and uploads it to the control system. The control system receives and processes the information from the operating condition identification module, assesses whether intervention via a flexible stiffness damping mechanism is necessary, and controls the flexible stiffness damping mechanism when intervention is required.

[0030] The flexible stiffness damping mechanism includes a connecting rod 13, a limiting block 14, a stiffness spring 15, a servo positioning mechanism 17, and a servo motor 18. The control system is connected to the servo motor 18, and the limiting block 14 is bolted to the connecting rod 13. The stiffness spring 15 is connected to the limiting block 14 and the servo positioning mechanism 17, and is confined between the limiting block 14 and the servo positioning mechanism 17. It is used to absorb the chemical energy of combustion in the cylinder during the expansion stroke and release the stored elastic potential energy during the compression stroke. The servo positioning mechanism 17 is arranged on a guide rail 16 between the linear motor and the free piston engine, driven and positioned by the servo motor 18 to confine the stiffness spring 15 to a specific length, achieving flexible control.

[0031] It should be noted that the stiffness spring 15 of the free piston generator system can be limited to different lengths depending on the operating conditions. The present invention does not limit the specific length of a particular length.

[0032] It should be noted that, under normal operating conditions, the flexible stiffness damping mechanism can improve the isochoricity of the compression stroke, thereby increasing thermal efficiency, and absorb and store excess energy during the power stroke, which helps reduce cyclic fluctuations. Under unstable operating conditions, the flexible stiffness damping mechanism can reduce the impact of excessive burst pressure on the free piston generator system, allowing the free piston generator system to return to normal operating conditions.

[0033] Furthermore, the flexible stiffness damping mechanism moves on the same axis as the free piston engine, eliminating the need for a transmission device, effectively reducing structural complexity and greatly improving operational reliability.

[0034] Furthermore, the rigidity of the flexible stiffness damping mechanism can be changed according to different working conditions, and the stroke is consistent with that of the piston, resulting in good stability.

[0035] Furthermore, the free piston generator system can independently determine whether it is in an unstable operating condition and take countermeasures through the control unit.

[0036] In one possible implementation, the free-piston engine includes: an engine block 5, a cylinder head 4, a direct injection injector 3, a spark plug 2, a cylinder pressure sensor 1, and piston moving parts. The engine block 5 is provided with a scavenging zone air inlet 12 and a scavenging zone exhaust port 7. The cylinder head 4 is fastened to the engine block 5 with bolts and has externally mounted air-cooled fins 6 for cooling. The cylinder pressure sensor 1, spark plug 2, and direct injection injector 3 are mounted on the cylinder head 4.

[0037] Furthermore, the piston moving parts include: piston 8, oil scraper ring 9, compression ring 10, and piston pin 11. One end of piston 8 is connected to the linear motor mover 22 in the linear motor through piston pin 11 and connecting rod 13. The oil scraper ring 9 and compression ring 10 divide the cylinder into combustion chamber area and scavenging area.

[0038] The combustion chamber area consists of the area enclosed by the cylinder head 4, the front end of the engine block 5, and the oil scraper ring 9. The scavenging area consists of the area enclosed by the rear end of the engine block 5 and the air intake ring 10.

[0039] In one possible implementation, the linear motor includes: a linear motor housing 19, a linear motor guide slot 20, a coil winding 21, a linear motor mover 22, and a displacement sensor 23. The linear motor guide slot 20 is disposed inside the linear motor housing 19 and passes through the linear motor, supporting the moving linear motor mover 22 during operation. The coil winding 21 is arranged around the linear motor guide slot 20 and is controlled by a signal transmission line 25. When energized, it drives the linear motor mover 22 and generates electricity after switching. The surface of the linear motor mover 22 is provided with a permanent magnet, and the displacement sensor 23 is installed inside.

[0040] In one possible implementation, the operating condition identification module includes: a displacement sensor 23, a cylinder pressure sensor 1, a signal acquisition line 24, and a signal transmission line 25. The displacement sensor 23 is located inside the linear motor mover 22 and moves with it, collecting displacement parameters to determine the mover's motion state. These parameters are then transmitted to the information processing unit 26 of the control system via the signal acquisition line 24. The cylinder pressure sensor 1 is located on the cylinder head 4 and collects cylinder pressure parameters within the free-piston engine to determine the combustion status within the cylinder. These parameters are also transmitted to the information processing unit 26 of the control system via the signal acquisition line 24 and the signal transmission line 25. The signal acquisition line 24 is located on each subsystem, including fuel injection signal lines, ignition signal lines, and motor signal lines. It is connected to the information processing unit 26 of the control system via the signal transmission line 25 and is used to trigger and acquire signals from the fuel injector, spark plug, and motor to control the operation of each subsystem. The signal transmission line 25 is connected to the signal acquisition line 24 and is arranged outside the linear motor housing 19 for transmitting acquired parameters, signals and commands.

[0041] In one possible implementation, the control system includes a host computer 28, an information processing unit 26, and a control unit 27. The host computer 28 is connected to the information processing unit 26 and the control unit 27. The information processing unit 26 is connected to the signal transmission line 25 and is used to receive parameter information from the displacement sensor 23 and the cylinder pressure sensor 1 and perform post-processing. The control unit 27 is connected to the operating condition identification module and, upon receiving an intervention command, drives the servo motor 18 to change the relative position of the servo positioning mechanism 17.

[0042] In one possible implementation, the free piston generator system has both normal operating conditions and unstable operating conditions.

[0043] Reference manual attached Figure 2 The diagram illustrates the working principle of a free piston generator system equipped with a flexible stiffness damping mechanism under normal operating conditions, as provided in an embodiment of the present invention.

[0044] Furthermore, when the free piston generator system is in normal operating condition, the servo positioning mechanism 17 is fixedly set, and the relative distance between the servo positioning mechanism 17 and the limit block 14 is fixed. When the left side of the free piston engine is in the compression stroke, the stiffness spring 15 on the right side is gradually compressed due to the work done on the right side, and the force is applied to the connecting rod 13 through the limit block 14, which slows down the upward speed of the piston 8 on the left side. The stiffness spring 15 on the left side is also affected by the work done on the right side. As the limit block 14 moves to the left, the stiffness spring 15 on the left side gradually stretches. The stiffness spring 15 on the left side is in a traction state, which reduces the upward speed of the piston 8 on the left side. Under the combined action of the stiffness springs 15 on both sides, the running trajectory of the piston 8 is changed, and the dwell time of the piston 8 at the top dead center is increased.

[0045] Reference manual attached Figure 3 The diagram illustrates the working principle of a free piston generator system equipped with a flexible stiffness damping mechanism under unstable operating conditions, as provided in an embodiment of the present invention.

[0046] Furthermore, the unstable operating condition includes excessively high burst pressure on the left side. When the burst pressure on the left side of the free piston generator system is too high, the cylinder pressure sensor 1 in the operating condition identification module detects the cylinder pressure and transmits the parameters to the information processing unit 26 via the signal transmission line 25. After processing by the information processing unit 26, it is determined that the cylinder pressure is too high, and the abnormal information is transmitted to the host computer 28. The host computer 28 transmits the control command to the servo motor 18 through the control unit 27, controlling the servo motor 18 to move the servo positioning mechanism 17. During the expansion stroke, the relative distance between the left servo positioning mechanism 17 and the limit block 14 is shortened, and the relative distance between the right servo positioning mechanism 17 and the limit block 14 is increased. This increases the force applied to the limit block 14 by the stiffness spring 15, reducing the impact of excessively high burst pressure on the free piston generator system.

[0047] Furthermore, unstable operating conditions include incomplete combustion or subsystem failure. When incomplete combustion or subsystem failure occurs, the displacement sensor 23 in the operating condition identification module detects the displacement parameters of the linear motor mover 22, and the cylinder pressure sensor 1 detects the cylinder pressure. These parameters are transmitted to the information processing unit 26 via the signal transmission line 25. After processing by the information processing unit 26, it is determined that the displacement or cylinder pressure does not meet the stable operating conditions, or that a signal in a certain subsystem is disconnected or abnormal. The information processing unit 26 then transmits the abnormal information to the host computer 28. The host computer 28 transmits the control command to the servo motor 18 via the control unit 27, controlling the servo motor 18 to move the servo positioning mechanism 17. During the compression stroke, the relative distance between the left servo positioning mechanism 17 and the limit block 14 is increased, while the relative distance between the right servo positioning mechanism 17 and the limit block 14 is shortened. The force applied to the limit block 14 by the stiffness spring 15 is increased, and the speed of the piston 8 is increased, so that the free piston generator system returns to normal operating conditions.

[0048] The beneficial effects of the technical solutions provided in the embodiments of the present invention include at least the following:

[0049] In this invention, a flexible stiffness damping mechanism is provided between the linear motor and the free piston engine. This mechanism can automatically determine whether the engine is in an unstable operating condition and can be modified according to different operating conditions. Under normal operating conditions, the flexible stiffness damping mechanism can improve the isochoricity of the compression stroke, thereby improving thermal efficiency, and absorb and store excess energy during the power stroke, which helps to reduce cycle fluctuations. Under unstable operating conditions, the flexible stiffness damping mechanism can reduce the impact of excessively high burst pressure on the free piston generator system, allowing the free piston generator system to return to normal operating conditions.

[0050] This invention encompasses any substitutions, modifications, equivalent methods, and solutions made within the spirit and scope of this invention. To provide the public with a thorough understanding of this invention, specific details are described in detail in the preferred embodiments, while those skilled in the art will fully understand the invention even without these details. Furthermore, to avoid unnecessary misunderstanding of the essence of this invention, well-known methods, processes, procedures, components, and circuits are not described in detail.

[0051] The above are only preferred embodiments of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A free piston generator system equipped with a flexible stiffness damping mechanism, characterized in that, include: Linear motor, free piston engine, flexible stiffness damping mechanism, operating condition identification module and control system; The free piston engine is connected to the linear motor; Both the free piston engine and the linear motor are connected to the operating condition identification module. The operating condition identification module is used to automatically identify the current operating condition of the free piston generator system and upload it to the control system; The control system is used to receive and process the information from the operating condition identification module, assess whether intervention is needed through the flexible stiffness damping mechanism, and control the flexible stiffness damping mechanism when intervention is needed. The flexible stiffness damping mechanism includes: a connecting rod, a limiting block, a stiffness spring, a servo positioning mechanism, and a servo motor; the control system is connected to the servo motor, and the limiting block is fastened to the connecting rod by bolts; the stiffness spring is connected to the limiting block and the servo positioning mechanism, and is confined between the limiting block and the servo positioning mechanism, for absorbing the chemical energy of combustion in the cylinder during the expansion stroke and releasing the stored elastic potential energy during the compression stroke; the servo positioning mechanism is arranged on the guide rail between the linear motor and the free piston engine, driven and positioned by the servo motor to limit the stiffness spring to a specific length, thereby achieving flexible control; The flexible stiffness damping mechanism is provided on both sides of the linear motor. The free piston generator system has normal operating conditions; When the free piston generator system is in normal operating condition, the servo positioning mechanism is fixedly set, and the relative distance between the servo positioning mechanism and the limiting block is fixed. When the left side of the free piston engine is in the compression stroke, the stiffness spring on the right side is gradually compressed due to the work done on the right side, and the force is applied to the connecting rod through the limiting block on the right side, slowing down the upward speed of the piston on the left side. The stiffness spring on the left side is also affected by the work done on the right side. As the limiting block moves to the left, the stiffness spring on the left side gradually lengthens and is in a traction state, reducing the upward speed of the piston on the left side. Under the combined action of the stiffness springs on both sides, the piston's running trajectory is changed, increasing the piston's dwell time at top dead center.

2. The free piston generator system equipped with a flexible stiffness damping mechanism according to claim 1, characterized in that, The free piston engine includes: engine block, cylinder head, direct injection injector, spark plug, cylinder pressure sensor, and piston moving parts; The engine block is provided with a scavenging area air inlet and a scavenging area exhaust port for scavenging; the cylinder head is fastened to the engine block by bolts and externally mounted with air-cooled fins for cooling; the cylinder pressure sensor, the spark plug and the direct injection injector are mounted on the cylinder head.

3. The free piston generator system equipped with a flexible stiffness damping mechanism according to claim 2, characterized in that, The piston moving parts include: piston, oil scraper ring, compression ring and piston pin; One end of the piston is connected to the linear motor mover in the linear motor through the piston pin and the connecting rod. The cylinder is divided into a combustion chamber area and a scavenging area by the oil scraper ring and the gas ring. The combustion chamber region is composed of the area enclosed by the cylinder head, the front end of the engine block, and the oil scraper ring; the scavenging region is composed of the area enclosed by the rear end of the engine block and the air ring.

4. The free piston generator system equipped with a flexible stiffness damping mechanism according to claim 1, characterized in that, The linear motor includes: a linear motor housing, a linear motor guide slot, a coil winding, a linear motor mover, and a displacement sensor; The linear motor guide groove is located inside the linear motor housing and passes through the linear motor, supporting the linear motor mover during operation; the coil winding is arranged around the linear motor guide groove, controlled by the signal transmission line, drives the linear motor mover after being energized, and generates electricity after switching; the surface of the linear motor mover is provided with a permanent magnet and the displacement sensor is installed inside.

5. The free piston generator system equipped with a flexible stiffness damping mechanism according to claim 1, characterized in that, The operating condition identification module includes: a displacement sensor, a cylinder pressure sensor, a signal acquisition line, and a signal transmission line; The displacement sensor is installed inside the linear motor mover and moves with it, collecting displacement parameters to determine the mover's motion state. These parameters are then transmitted to the information processing unit of the control system via the signal acquisition line. The cylinder pressure sensor is installed on the cylinder head to collect cylinder pressure parameters within the free piston engine, determining the combustion status within the cylinder. These parameters are also transmitted to the information processing unit of the control system via the signal acquisition and transmission lines. The signal acquisition lines are installed on each subsystem, including fuel injection signal lines, ignition signal lines, and motor signal lines. They are connected to the information processing unit of the control system via the signal transmission lines to trigger and acquire signals from the fuel injectors, spark plugs, and linear motor, controlling the operation of each subsystem. The signal transmission line is connected to the signal acquisition lines and is located outside the linear motor housing, transmitting the acquired parameters, signals, and commands.

6. The free piston generator system equipped with a flexible stiffness damping mechanism according to claim 1, characterized in that, The control system includes a host computer, an information processing unit, and a control unit; The host computer is connected to the information processing unit and the control unit; the information processing unit is connected to the signal transmission line and is used to receive parameter information from the displacement sensor and cylinder pressure sensor and perform post-processing; the control unit is connected to the operating condition identification module and drives the servo motor to change the relative position of the servo positioning mechanism after receiving the intervention command.

7. The free piston generator system equipped with a flexible stiffness damping mechanism according to claim 1, characterized in that, The free piston generator system is subject to unstable operating conditions.

8. The free piston generator system equipped with a flexible stiffness damping mechanism according to claim 7, characterized in that, Instability conditions include excessively high burst pressure on the left side; When the explosion pressure on the left side of the free piston generator system is too high, the cylinder pressure sensor in the operating condition identification module detects the cylinder pressure and transmits the parameters to the information processing unit through the signal transmission line. After processing by the information processing unit, it is determined that the cylinder pressure is too high, and the abnormal information is transmitted to the host computer. The host computer transmits the control command to the servo motor through the control unit, controlling the servo motor to move the servo positioning mechanism. During the expansion stroke, the relative distance between the left servo positioning mechanism and the left limit block is shortened, while the relative distance between the right servo positioning mechanism and the right limit block is increased.

9. The free piston generator system equipped with a flexible stiffness damping mechanism according to claim 7, characterized in that, Instability conditions include incomplete combustion or subsystem failure; When combustion is incomplete or a subsystem malfunctions, the displacement sensor in the operating condition identification module detects the displacement parameters of the linear motor actuator, and the cylinder pressure sensor detects the cylinder pressure. These parameters are transmitted to the information processing unit via a signal transmission line. After processing, the information processing unit determines that the displacement or cylinder pressure does not meet stable operating conditions, or that a signal in a certain subsystem is disconnected or abnormal. The information processing unit then transmits the abnormal information to the host computer. The host computer transmits control commands to the servo motor through the control unit, controlling the servo motor to move the servo positioning mechanism. During the compression stroke, the relative distance between the left servo positioning mechanism and the left limit block is increased, while the relative distance between the right servo positioning mechanism and the right limit block is shortened.

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