Free piston generator system equipped with flexible rigidity damping mechanism

Abstract

The invention provides a free piston generator system equipped with a flexible rigidity damping mechanism, and relates to the technical field of piston generators, and the free piston generator system comprises a linear motor, a free piston engine, the flexible rigidity damping mechanism, an operation condition identification module and a control system; the control system is used for receiving and processing information of the operation condition recognition module, evaluating whether intervention needs to be carried out through the flexible rigidity vibration reduction mechanism or not, and controlling the flexible rigidity vibration reduction mechanism when intervention needs to be carried out; the flexible rigidity damping mechanism comprises a connecting rod, a limiting block, a rigidity spring, a servo positioning mechanism and a servo motor. The control system is connected with the servo motor, and the limiting block is fastened on the connecting rod through a bolt; the stiffness spring is connected with the limiting block and the servo positioning mechanism and is limited between the limiting block and the servo positioning mechanism; and the servo positioning mechanism is arranged on the guide rail between the linear motor and the free piston engine and is driven and positioned by the servo motor so as to limit the stiffness spring to a specific length.

Description

Technical Field

[0001] The invention relates to the technical field of piston generators, and in particular to a free piston generator system equipped with a flexible stiffness vibration reduction mechanism. Background Art

[0002] As environmental pollution and energy shortage become increasingly serious, conventional internal combustion engines can no longer meet people's daily needs. Therefore, researchers have begun to develop and improve new hybrid devices and related technologies. The free piston generator has potential theoretical advantages such as high thermal efficiency, high power per unit volume, easy modularization, and low pollutant emissions. It can be applied to pure electric range extension, hybrid power and other power fields, and has great application value and potential.

[0003] Unlike traditional internal combustion generators, as a new type of power device that does not require the crankshaft connecting rod mechanism and cam valve mechanism of traditional internal combustion engines, the free piston generator combines the free piston engine with a linear generator. The piston only reciprocates in a straight line, avoiding the large friction loss between the piston and the cylinder wall caused by the crank connecting rod mechanism, as well as the large mechanical loss caused by more moving parts. At the same time, due to its adjustable compression ratio and simple structure, it can adapt to a variety of fuels and obtain the best performance under most working conditions.

[0004] As for the current free piston generator, a two-stroke cycle is mostly used. At the same time, due to its unique piston operation law and matching method, the motion characteristics of the piston in the continuous movement process are completely dependent on the force it is subjected to. Therefore, the free piston generator is more prone to unstable working conditions than traditional internal combustion engines. Under unstable working conditions, it is likely to affect the overall efficiency and working stability of the free piston generator, bringing greater safety hazards to the operation of the free piston generator. For example, if the combustion in the cylinder of the free piston generator on one side is unstable, if there is no external intervention, the vibration or cycle fluctuation caused by this unstable combustion will easily cause the cylinder of the free piston generator on the opposite side to misfire or even shut down due to the failure to reach the cylinder pressure required for ignition or the piston not moving to the position required for ignition. Or due to the failure of the ignition, fuel injection and other systems of the free piston generator on one side, there will be no ignition, no fuel injection or insufficient fuel injection, thereby reducing the stability of the free piston generator working condition. Summary of the invention

[0005] In order to solve the technical problem that the existing free piston generator is prone to unstable working conditions, affecting the overall efficiency and working stability of the free piston generator and bringing great safety hazards to the operation of the free piston generator, the present invention provides a free piston generator system equipped with a flexible stiffness vibration reduction mechanism.

[0006] The technical solution provided by the embodiment of the present invention is as follows:

[0007] A free piston generator system equipped with a flexible stiffness vibration reduction mechanism provided in an embodiment of the present invention comprises: a linear motor, a free piston engine, a flexible stiffness vibration reduction mechanism, an operating condition identification module and a control system;

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

[0009] The free piston engine and the linear motor are both 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 of the operating condition identification module, evaluate whether intervention is required through the flexible stiffness vibration reduction mechanism, and control the flexible stiffness vibration reduction mechanism when intervention is required;

[0012] The flexible stiffness vibration 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 confined between the limit block and the servo positioning mechanism, and 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 is arranged on the guide rail between the linear motor and the free piston engine, and is driven and positioned by the servo motor to limit the stiffness spring to a specific length to achieve flexible control.

[0013] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0014] In the present invention, a flexible stiffness vibration damping mechanism is arranged between the linear motor and the free piston engine, and can judge whether it is in an unstable working condition by itself. The flexible stiffness vibration damping mechanism can be changed according to different working conditions. Under normal operating conditions, the flexible stiffness vibration damping mechanism can improve the isochoricity of the compression stroke and thus improve thermal efficiency, absorb and store excess energy of the working stroke, and is beneficial to reducing cycle fluctuations. Under unstable working conditions, the flexible stiffness vibration damping mechanism can reduce the influence of excessive explosion pressure on the free piston generator system, so that the free piston generator system can be restored to normal operating conditions. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0016] Figure 1 A schematic structural diagram of a free piston generator system equipped with a flexible stiffness vibration reduction mechanism provided by an embodiment of the present invention;

[0017] Figure 2 A working principle diagram of a free piston generator system equipped with a flexible stiffness vibration reduction mechanism under normal operating conditions provided by an embodiment of the present invention;

[0018] Figure 3 A working principle diagram of a free piston generator system equipped with a flexible stiffness vibration reduction mechanism under unstable operation conditions provided in an embodiment of the present invention.

[0019] [reference numerals]

[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 of scavenging area; 8. Piston; 9. First piston ring - oil scraper ring; 10. Second piston ring - gas ring; 11. Piston pin; 12. Air inlet of scavenging area; 13. Connecting rod; 14. Limit block; 15. Rigid 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, in order to clearly implement the structure of the embodiment of the present invention, specific structures and devices are marked in the figure, but this is only for illustrative purposes and is not intended to limit the present invention to the specific structure, device and environment. According to specific needs, ordinary technicians in this field can adjust or modify these devices and environments. DETAILED DESCRIPTION

[0022] The technical solution of the present invention is described below in conjunction with the accompanying drawings. It is also noted that, in order to make the embodiments more detailed, the following embodiments are the best and preferred embodiments, and those skilled in the art may also adopt other alternatives to implement some known technologies; and 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 references to "one embodiment", "an embodiment", "an exemplary embodiment", "some embodiments" and the like in the specification indicate that the embodiments described may include specific features, structures or characteristics, but not every embodiment may include the specific features, structures or characteristics. In addition, when a specific feature, structure or characteristic is described in conjunction with an embodiment, it should be within the knowledge of a person skilled in the art to implement such feature, structure or characteristic in conjunction with other embodiments (whether or not explicitly described).

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

[0025] It will be understood that the meanings of “on,” “over,” and “above” in the present invention should be interpreted in the broadest manner, so that “on” not only means “directly on” something, but also includes the meaning of being “on” something with intervening features or layers therebetween, and “on” or “over” not only means “on” or “above” something, but also includes the meaning of being “on” or “above” something with no intervening features or layers therebetween.

[0026] Additionally, spatially relative terms such as "under," "beneath," "lower," "above," "upper," and the like may be used herein for descriptive convenience to describe the relationship of one element or feature to another element or features, as shown in the accompanying drawings. Spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the accompanying drawings. The device may be oriented in other ways, and the spatially relative descriptors used herein may be similarly interpreted accordingly.

[0027] Reference Manual Attached Figure 1 , showing a schematic structural diagram of a free piston generator system equipped with a flexible stiffness vibration reduction mechanism provided in an embodiment of the present invention.

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

[0029] The free piston engine is connected to the linear motor. The free piston engine and the linear motor are both connected to the operating condition identification module. The operating condition identification module is used to automatically identify the operating condition of the current free piston generator system and upload it to the control system. The control system is used to receive and process the information of the operating condition identification module, evaluate whether intervention is required through the flexible stiffness vibration reduction mechanism, and control the flexible stiffness vibration reduction mechanism when intervention is required.

[0030] The flexible stiffness vibration reduction mechanism includes: a connecting rod 13, a limit 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 limit block 14 is fastened to the connecting rod 13 by bolts. The stiffness spring 15 is connected to the limit block 14 and the servo positioning mechanism 17, and is limited between the limit block 14 and the servo positioning mechanism 17, and 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 the guide rail 16 between the linear motor and the free piston engine, and is driven and positioned by the servo motor 18 to limit the stiffness spring 15 to a specific length to achieve flexible control.

[0031] It should be noted that the free piston generator system can limit the stiffness spring 15 to different lengths according to different working conditions, and the present invention does not limit the specific length of the specific length.

[0032] It should be noted that the flexible stiffness damping mechanism can improve the isochoricity of the compression stroke under normal operating conditions, thereby improving thermal efficiency, absorbing and storing excess energy in the working stroke, and is conducive to reducing cycle fluctuations. The flexible stiffness damping mechanism can reduce the impact of excessive explosion pressure on the free piston generator system under unstable conditions, allowing the free piston generator system to return to normal operating conditions.

[0033] Furthermore, the movement of the flexible stiffness vibration reduction mechanism and the free piston engine are on the same axis, and no transmission device is required, which effectively reduces the complexity of the structure and greatly improves the reliability of operation.

[0034] Furthermore, the rigidity of the flexible rigidity vibration reduction mechanism can be changed according to different working conditions, and the movement stroke is consistent with the piston, so the stability is good.

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

[0036] In a possible embodiment, 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 a piston moving part. The engine block 5 is provided with a scavenging area air inlet 12 and a scavenging area exhaust port 7 for scavenging. The cylinder head 4 is fastened to the engine block 5 by bolts, and an external air cooling fin 6 is provided for cooling. The cylinder pressure sensor 1, the spark plug 2, and the direct injection injector 3 are installed on the cylinder head 4.

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

[0038] The combustion chamber area is composed of the cylinder head 4, the front end of the engine block 5 and the area surrounded by the oil scraper ring 9. The scavenging area is composed of the rear end of the engine block 5 and the area surrounded by the gas ring 10.

[0039] In a possible embodiment, 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 arranged inside the linear motor housing 19, passes through the linear motor, and supports the linear motor mover 22 in operation. The coil winding 21 is arranged around the linear motor guide slot 20, and is controlled by the signal transmission line 25. After power is turned on, 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 a displacement sensor 23 is installed inside.

[0040] In a 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 arranged inside the linear motor mover 22 and moves with the linear motor mover 22, collects the displacement parameters of the linear motor mover 22 to determine the motion state of the motor mover, and transmits the parameters to the information processing unit 26 of the control system through the signal acquisition line 24. The cylinder pressure sensor 1 is arranged on the cylinder head 4, and is used to collect the cylinder pressure parameters in the free piston engine to determine the combustion condition in the cylinder, and transmits the parameters to the information processing unit 26 of the control system through the signal acquisition line 24 and the signal transmission line 25. The signal acquisition line 24 is arranged on each subsystem, including an injection acquisition signal line, an ignition acquisition signal line, and a motor acquisition signal line, and is connected to the information processing unit 26 in the control system through the signal transmission line 25, and is used to trigger and collect signals on the injector, spark plug and motor, and control the operation of each subsystem. The signal transmission line 25 is connected to the signal collection line 24 and is arranged outside the linear motor housing 19 for transmitting the collected parameters, signals and instructions.

[0041] In a 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 of 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 drives the servo motor 18 after receiving the intervention instruction to change the relative position of the servo positioning mechanism 17.

[0042] In one possible implementation, the free piston generator system has a normal operating condition and an unstable operating condition.

[0043] Reference Manual Attached Figure 2 , showing a working principle diagram of a free piston generator system equipped with a flexible stiffness vibration reduction mechanism provided by an embodiment of the present invention under normal operating conditions.

[0044] Furthermore, when the free piston generator system is in normal operating conditions, the servo positioning mechanism 17 is fixedly arranged, 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 a compression stroke, the stiffness spring 15 on the right side is gradually compressed due to the workmanship of the right side, and exerts force on the connecting rod 13 through the limit block 14, slowing 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 workmanship of the right side. As the limit block 14 moves to the left, the stiffness spring 15 on the left side is gradually lengthened. The stiffness spring 15 on the left side is in a traction state, reducing the upward speed of the piston 8 on the left side. Under the joint action of the stiffness springs 15 on the left and right sides, the running trajectory of the piston 8 is changed, and the residence time of the piston 8 at the top dead center is increased.

[0045] Reference Manual Attached Figure 3 , showing a working principle diagram of a free piston generator system equipped with a flexible stiffness vibration reduction mechanism under unstable operation conditions provided by an embodiment of the present invention.

[0046] Furthermore, the instability condition includes the left explosion pressure being too high. When the explosion 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 pressure in the cylinder, transmits the parameter to the information processing unit 26 through the signal transmission line 25, and after being processed by the information processing unit 26, it is determined that the pressure in the cylinder is too high, and the abnormal information is transmitted to the host computer 28. The host computer 28 transmits the control instruction to the servo motor 18 through the control unit 27, controls the servo motor 18 to move the servo positioning mechanism 17, shortens the relative distance between the left servo positioning mechanism 17 and the limit block 14 during the expansion stroke, and increases the relative distance between the right servo positioning mechanism 17 and the limit block 14, increases the force applied by the stiffness spring 15 to the limit block 14, and reduces the influence of the excessive explosion pressure on the free piston generator system.

[0047] Furthermore, the unstable working condition includes incomplete combustion or subsystem failure. When the combustion is incomplete or the subsystem fails, the displacement sensor 23 in the operating condition identification module detects the displacement parameter of the linear motor mover 22, and the cylinder pressure sensor 1 detects the pressure in the cylinder, and transmits the parameter to the information processing unit 26 through the signal transmission line 25. After the information processing unit 26 processes and determines that the displacement or cylinder pressure does not meet the stable operating conditions or the signal of a subsystem is disconnected or abnormal, the information processing unit 26 transmits the abnormal information to the host computer 28, and the host computer 28 transmits the control instruction to the servo motor 18 through the control unit 27, controls the servo motor 18 to move the servo positioning mechanism 17, increases the relative distance between the left servo positioning mechanism 17 and the limit block 14 in the compression stroke, and shortens the relative distance between the right servo positioning mechanism 17 and the limit block 14, increases the force applied by the stiffness spring 15 to the limit block 14, increases the speed of the piston 8, and restores the free piston generator system to a normal operating condition.

[0048] The beneficial effects brought about by the technical solution provided by the embodiment of the present invention include at least:

[0049] In the present invention, a flexible stiffness vibration damping mechanism is arranged between the linear motor and the free piston engine, and can judge whether it is in an unstable working condition by itself. The flexible stiffness vibration damping mechanism can be changed according to different working conditions. Under normal operating conditions, the flexible stiffness vibration damping mechanism can improve the isochoricity of the compression stroke and thus improve thermal efficiency, absorb and store excess energy of the working stroke, and is beneficial to reducing cycle fluctuations. Under unstable working conditions, the flexible stiffness vibration damping mechanism can reduce the influence of excessive explosion pressure on the free piston generator system, so that the free piston generator system can be restored to normal operating conditions.

[0050] The present invention covers any substitution, modification, equivalent method and scheme made on the essence and scope of the present invention. In order to make the public have a thorough understanding of the present invention, specific details are described in detail in the preferred embodiments of the present invention, but those skilled in the art can fully understand the present invention without the description of these details. In addition, in order to avoid unnecessary confusion about the essence of the present 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 vibration reduction mechanism, characterized in that: include: Linear motor, free piston engine, flexible stiffness vibration reduction mechanism, operating condition identification module and control system; The free piston engine is connected to the linear motor; The free piston engine and the linear motor are both 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 of the operating condition identification module, evaluate whether intervention is required through the flexible stiffness vibration reduction mechanism, and control the flexible stiffness vibration reduction mechanism when intervention is required; The flexible stiffness vibration 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 confined between the limit block and the servo positioning mechanism, and 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 is arranged on the guide rail between the linear motor and the free piston engine, and is driven and positioned by the servo motor to limit the stiffness spring to a specific length to achieve flexible control.

2. The free piston generator system equipped with a flexible stiffness vibration reduction mechanism according to claim 1, characterized in that: The free piston engine comprises: an engine block, a cylinder head, a direct injection injector, a spark plug, a cylinder pressure sensor and a piston moving part; 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 an external air-cooling fin is used for cooling; the cylinder pressure sensor, the spark plug and the direct injection injector are installed on the cylinder head.

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

4. The free piston generator system equipped with a flexible stiffness vibration reduction mechanism according to claim 1, characterized in that: The linear motor comprises: 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 arranged inside the linear motor housing and passes through the linear motor to support the linear motor mover in operation; the coil winding is arranged around the linear motor guide groove and is controlled by the signal transmission line to drive the linear motor mover after power is turned on and generate electricity after switching; a permanent magnet is arranged on the surface of the linear motor mover and the displacement sensor is installed inside.

5. The free piston generator system equipped with a flexible stiffness vibration reduction 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 arranged inside the linear motor mover and moves with the linear motor mover, collects the displacement parameters of the linear motor mover to determine the movement state of the motor mover, and transmits the parameters to the information processing unit of the control system through the signal acquisition line; the cylinder pressure sensor is arranged on the cylinder head, and is used to collect the cylinder pressure parameters in the free piston engine to determine the combustion condition in the cylinder, and transmits the parameters to the information processing unit of the control system through the signal acquisition line and the signal transmission line; the signal acquisition line is arranged on each subsystem, including an injection acquisition signal line, an ignition acquisition signal line, and a motor acquisition signal line, and is connected to the information processing unit in the control system through the signal transmission line, and is used to trigger and collect signals on the injector, spark plug and motor, and control the operation of each subsystem; the signal transmission line is connected to the signal acquisition line, and is arranged outside the linear motor housing, and is used to transmit the collected parameters, signals and instructions.

6. The free piston generator system equipped with a flexible stiffness vibration reduction 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 of the displacement sensor and the cylinder pressure sensor and perform post-processing; the control unit is connected to the operating condition identification module, and drives the servo motor after receiving the intervention instruction to change the relative position of the servo positioning mechanism.

7. The free piston generator system equipped with a flexible stiffness vibration reduction mechanism according to claim 1, characterized in that: The free piston generator system has a normal operating condition and an unstable operating condition.

8. The free piston generator system equipped with a flexible stiffness vibration reduction mechanism according to claim 7, characterized in that: When the free piston generator system is in normal operating conditions, the servo positioning mechanism is fixedly arranged, and the relative distance between the servo positioning mechanism and the limit block is fixed. When the left side of the free piston engine is in a compression stroke, the stiffness spring on the right side is gradually compressed due to the workmanship of the right side, and applies force to the connecting rod through the limit block, slowing down the upward speed of the piston on the left side. The stiffness spring on the left side is also affected by the workmanship of the right side. As the limit block moves to the left, the stiffness spring on the left side is gradually lengthened, and the stiffness spring on the left side is in a traction state, reducing the upward speed of the piston on the left side. Under the joint action of the stiffness springs on the left and right sides, the running trajectory of the piston is changed, and the residence time of the piston at the top dead center is increased.

9. The free piston generator system equipped with a flexible stiffness vibration reduction mechanism according to claim 7, characterized in that: Instability conditions include excessive left-side burst pressure; 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 pressure in the cylinder, 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 pressure in the cylinder is too high, and the abnormal information is transmitted to the host computer. The host computer transmits the control instruction to the servo motor through the control unit, controls the servo motor to move the servo positioning mechanism, shortens the relative distance between the servo positioning mechanism and the limit block on the left side and increases the relative distance between the servo positioning mechanism and the limit block on the right side during the expansion stroke, increases the force applied to the limit block by the stiffness spring, and reduces the influence of the excessive explosion pressure on the free piston generator system.

10. The free piston generator system equipped with a flexible stiffness vibration reduction mechanism according to claim 7, characterized in that: Unstable conditions include incomplete combustion or subsystem failure; When combustion is incomplete or a subsystem fails, the displacement sensor in the operating condition identification module detects the displacement parameters of the linear motor rotor and the cylinder pressure sensor detects the pressure in the cylinder. The parameters are transmitted to the information processing unit through the signal transmission line. After processing by the information processing unit, it is determined that the displacement or cylinder pressure does not meet the stable operating conditions or the signal of a subsystem is disconnected or abnormal. The information processing unit transmits the abnormal information to the host computer, and the host computer transmits the control instruction to the servo motor through the control unit, controls the servo motor to move the servo positioning mechanism, increases the relative distance between the servo positioning mechanism and the limit block on the left side and shortens the relative distance between the servo positioning mechanism and the limit block on the right side during the compression stroke, increases the force applied to the limit block by the stiffness spring, increases the speed of the piston, and restores the free piston generator system to normal operating conditions.

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