CN118188153A - Free piston internal combustion generator system adaptable to various extreme environments - Google Patents
Free piston internal combustion generator system adaptable to various extreme environments Download PDFInfo
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- CN118188153A CN118188153A CN202410362079.6A CN202410362079A CN118188153A CN 118188153 A CN118188153 A CN 118188153A CN 202410362079 A CN202410362079 A CN 202410362079A CN 118188153 A CN118188153 A CN 118188153A
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- 230000007613 environmental effect Effects 0.000 claims abstract description 13
- 238000000034 method Methods 0.000 claims abstract description 13
- 238000001816 cooling Methods 0.000 claims description 17
- 239000000446 fuel Substances 0.000 claims description 9
- 238000009423 ventilation Methods 0.000 claims description 7
- 230000017525 heat dissipation Effects 0.000 claims description 4
- 238000013461 design Methods 0.000 description 4
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- 230000009286 beneficial effect Effects 0.000 description 3
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- 238000005299 abrasion Methods 0.000 description 2
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- 238000010586 diagram Methods 0.000 description 2
- 238000005259 measurement Methods 0.000 description 2
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- 238000013021 overheating Methods 0.000 description 2
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- 239000004606 Fillers/Extenders Substances 0.000 description 1
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Abstract
The invention provides a free piston internal combustion generator system and a control method which can adapt to various extreme environments, and relates to the technical field of internal combustion generators, wherein the free piston internal combustion generator system comprises: the device comprises a free piston engine, a linear motor, a frequency identification device, a state identification device and a control system; the piston of the free piston engine is connected with a linear motor rotor of the linear motor through a variable stroke connecting rod assembly; a frequency identification device is arranged between the sleeve of the free piston engine and the variable stroke connecting rod assembly, the frequency identification device is connected with the control system through a signal lead, and the frequency identification device is used for determining the current running frequency of the linear motor rotor; the state recognition device is connected with the control system through a signal lead and is used for determining the current environment state; the control system is used for adjusting the length of the connecting rod of the variable stroke connecting rod assembly according to the current environmental state, adjusting the running stroke of the engine and adjusting the running frequency.
Description
Technical Field
The invention relates to the technical field of data processing, in particular to a free piston internal combustion generator system adaptable to various extreme environments and a control method.
Background
The free piston internal combustion generator comprises a free piston engine and a linear motor, wherein a piston of the free piston engine is directly coupled with a rotor of the linear motor through a connecting rod, and a crank-connecting rod mechanism is eliminated. The free piston internal combustion generator directly outputs electric energy through the linear reciprocating motion of the piston, and has the advantages of simple structure, short energy transmission chain, high energy conversion efficiency, flexible and adjustable compression ratio and the like. Because the electric energy is directly output, the electric energy generator can be used for a new energy automobile range extender, island power generation, ship power generation and the like, and has wide application prospect.
However, the crank-link mechanism is eliminated, and the motion characteristic of the piston rotor assembly completely depends on the acting force applied to the piston rotor assembly in the continuous motion process, so that the piston rotor assembly has unique working principle and operation characteristics. Compared with the traditional engine, the free piston engine has poorer adaptability to external environment and working conditions, and is easily influenced by adverse working conditions to cause unstable operation. Such as cooling, ventilation and starting of free piston generators in high temperature, plateau and alpine regions. In high temperature areas, the cooling system of a free piston generator may be at risk of overheating, leading to reduced engine performance and even damage. In the plateau region, the lean air results in a reduction in the intake air amount, affecting combustion efficiency and power output. In severe cold regions, extreme low temperatures can cause the engine to be difficult to start. These problems not only affect the performance and reliability of the internal combustion engine, but also are directly related to the availability and efficiency of free piston generators in these areas. To solve the above problems, a free piston internal combustion generator system and method is needed that can accommodate a variety of extreme environments. To promote the application and development of free piston internal combustion generators in special environments.
Disclosure of Invention
In order to solve the technical problems that the prior art has poor adaptability to external environments and working conditions, is easily influenced by adverse working conditions to cause running instability, influences the performance and reliability of an internal combustion engine and influences the usability and efficiency in extreme environment areas, the invention provides a free piston internal combustion generator system which can adapt to various extreme environments.
The technical scheme provided by the embodiment of the invention is as follows:
First aspect:
The embodiment of the invention provides a free piston internal combustion generator system which can adapt to various extreme environments, comprising: the device comprises a free piston engine, a linear motor, a frequency identification device, a state identification device and a control system;
The piston of the free piston engine is connected with the linear motor rotor of the linear motor through a variable stroke connecting rod assembly;
A frequency identification device is arranged between the sleeve of the free piston engine and the variable stroke connecting rod assembly, the frequency identification device is connected with a control system through a signal lead, and the frequency identification device is used for determining the current running frequency of the linear motor rotor;
The state recognition device is connected with the control system through a signal lead and is used for determining the current environment state;
The control system is used for adjusting the length of the connecting rod of the variable stroke connecting rod assembly according to the current environmental state, adjusting the running stroke of the engine and adjusting the running frequency.
Second aspect:
the control method provided by the embodiment of the invention is applied to the free piston internal combustion generator system which can adapt to various extreme environments in the first aspect, and comprises the following steps:
detecting the temperature of the cylinder wall through the state identification device, determining the current cooling condition of the free piston internal combustion generator, and controlling the variable stroke connecting rod assembly to increase the length of the connecting rod through the control system when the temperature is too high, so that the running stroke of the engine is improved, the running frequency is reduced, the time of each cycle is increased, and more time is provided for heat dissipation;
detecting whether the air inflow reaches the standard or not through the state identification device, determining the current air inflow condition of the free piston internal combustion generator, controlling the variable stroke connecting rod assembly to increase the length of the connecting rod through the control system when the air inflow is lower, improving the running stroke of the engine, reducing the running frequency, and increasing the ventilation time of each cycle, thereby increasing the air inflow in each cycle;
And when the exhaust temperature is lower, the control system controls the variable stroke connecting rod assembly to shorten the length of the connecting rod, reduce the running stroke of the engine, increase the running frequency and quickly accumulate heat to realize the stable starting of the free piston internal combustion generator.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
According to the invention, the length of the variable stroke connecting rod is controlled to be lengthened or shortened by the control system so as to change the running stroke of the engine and adjust the running frequency, so that the problems of cooling, ventilation, starting and the like of the free piston internal combustion generator under the environmental conditions of high temperature, plateau and alpine regions are solved, the adaptability of the free piston internal combustion generator to external environments and working conditions is improved, the service life, the combustion efficiency and the starting performance of the generator can be improved by adjusting the running stroke and the frequency of the engine in real time, and therefore, the application requirements of the free piston internal combustion generator under various severe environmental conditions are better adapted, and the application and development of the free piston internal combustion generator in extreme environmental regions are promoted.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a free piston internal combustion generator system adaptable to a variety of extreme environments provided by an embodiment of the present invention;
Fig. 2 is a flow chart of a control method according to an embodiment of the present invention.
Reference numerals:
1. An in-cylinder pressure sensor; 2. an igniter; 3. an oil injector; 4. a cylinder cover; 5. air-cooled fins; 6. an exhaust pipe; 7. a cylinder; 8. an air inlet pipe; 9. a piston; 10. a piston pin; 11. piston rings; 12. a sleeve; 13. a magnetic switch assembly; 14. a permanent magnet; 15. a connecting rod; 16. a connecting rod guide rail; 17. a connecting rod piston; 18. a stud; 19. a servo motor; 20. a linear motor mover; 21. a linear motor stator; 22. a large base; 23. a cylinder wall temperature sensor; 24. an exhaust gas temperature sensor; 25. an air-fuel ratio analyzer; 26. a connecting rod sleeve; 27. a control unit ECU; 28. and an upper computer.
Detailed Description
The technical scheme of the invention is described below with reference to the accompanying drawings.
In embodiments of the invention, words such as "exemplary," "such as" and the like are used to mean serving as an example, instance, or illustration. Any embodiment or design described herein as "exemplary" is not necessarily to be construed as preferred or advantageous over other embodiments or designs. Rather, the term use of an example is intended to present concepts in a concrete fashion. Furthermore, in embodiments of the present invention, the meaning of "and/or" may be that of both, or may be that of either, optionally one of both.
In the embodiments of the present invention, "image" and "picture" may be sometimes used in combination, and it should be noted that the meaning of the expression is consistent when the distinction is not emphasized. "of", "corresponding (corresponding, relevant)" and "corresponding (corresponding)" are sometimes used in combination, and it should be noted that the meaning of the expression is consistent when the distinction is not emphasized.
In embodiments of the present invention, sometimes a subscript such as W 1 may be wrongly written in a non-subscript form such as W1, and the meaning of the expression is consistent when the distinction is not emphasized.
In order to make the technical problems, technical solutions and advantages to be solved more apparent, the following detailed description will be given with reference to the accompanying drawings and specific embodiments.
Referring to fig. 1 of the drawings, there is shown a schematic structural diagram of a free piston internal combustion generator system adaptable to a variety of extreme environments provided by an embodiment of the present invention.
Embodiments of the present invention provide a free piston internal combustion generator system adaptable to a variety of extreme environments, comprising: the device comprises a free piston engine, a linear motor, a frequency identification device, a state identification device and a control system.
Alternatively, the free piston internal combustion engine includes free piston engines at left and right ends, a linear motor disposed between the free piston engines at both ends, and a large base 22 supporting the free piston engines and the linear motor.
Optionally, the free piston engine comprises: in-cylinder pressure sensor 1, some firearm 2, sprayer 3, cylinder cap 4, forced air cooling fin 5, blast pipe 6, cylinder body 7 and intake pipe 8, in-cylinder pressure sensor 1 and some firearm 2 are adorned on cylinder cap 4, forced air cooling fin 5 distributes on cylinder cap 4 surface, cylinder cap 4 is installed on cylinder body 7, intake pipe 8 is linked together with blast pipe 6 and cylinder body 7, sprayer 3 is installed in intake pipe 8 departments, one side of sleeve 12 links to each other with cylinder body 7, the opposite side links to each other with linear electric motor, linear electric motor includes linear electric motor rotor 20 and linear electric motor stator 21.
The piston 9 of the free piston engine is connected with the linear motor rotor 20 of the linear motor through a variable stroke connecting rod assembly.
A frequency identification device is arranged between the sleeve 12 of the free piston engine and the variable stroke connecting rod assembly, and is connected with a control system through a signal lead wire and is used for determining the current running frequency of the linear motor rotor 20.
The state recognition device is connected with the control system through a signal lead and is used for determining the current environment state.
Wherein the state recognition means may detect the cylinder wall temperature, the intake air amount, and the exhaust gas temperature.
The control system is used for adjusting the length of the connecting rod of the variable stroke connecting rod assembly according to the current environmental state, adjusting the running stroke of the engine and adjusting the running frequency.
The length of the connecting rod of the variable stroke connecting rod assembly is adjusted, the running stroke of the engine is adjusted, the running frequency is adjusted, the adaptability of the free piston internal combustion generator to the external environment and working conditions can be improved, and the service life, the combustion efficiency and the starting performance of the generator can be improved through real-time adjustment of the running stroke and the frequency of the engine.
In one possible embodiment, the variable stroke link assembly includes: a connecting rod 15, a connecting rod piston 17, a connecting rod sleeve 26, a connecting rod guide rail 16, a stud 18 and a servo motor 19.
The connecting rod 15 and the connecting rod piston 17 are assembled to form a connecting rod moving end which is slidably disposed in the connecting rod sleeve 26 through the connecting rod guide rail 16.
The connecting rod 15 and the connecting rod piston 17 are internally provided with a threaded structure which is matched with a servo motor 19 through a stud 18.
Specifically, the connecting rod piston 17 and the connecting rod 15 are coupled into a whole through bolts, so that the stability of the whole structure is improved, the connecting rod piston 17 and the connecting rod guide rail 16 positioned in the connecting rod sleeve 26 form a sliding friction pair, and friction and abrasion are reduced. Meanwhile, the tail end of the connecting rod piston 17 is provided with a threaded hole, the threaded hole is matched with the stud 18, and the other side of the stud 18 is connected with the servo motor 19. When the free piston engine needs to adjust the length of the connecting rod, the control unit ECU 27 gives an instruction to the servo motor 19, the servo motor 19 drives the stud 18 to rotate, the stud 18 rotates in the threaded hole at the tail end of the connecting rod piston 17, and the connecting rod piston 17 move under the guidance of the connecting rod guide rail 16, so that the stroke of the variable stroke connecting rod assembly is changed. The inner wall of the cylinder body 7 is matched with a piston and a piston ring 11, the piston is connected with a connecting rod on one side of the variable stroke connecting rod assembly through a piston pin 10, and a connecting rod sleeve 26 on the other side of the variable stroke connecting rod assembly is connected with a linear motor rotor 20 to form the whole motion assembly of the free piston engine.
In the invention, the design advantage of the variable stroke connecting rod assembly is that the flexibility, efficiency, stability and reliability of the engine are improved, the integral structure is simplified, the abrasion and friction are reduced, and the support is provided for the efficient operation of the free piston engine under various working conditions.
In one possible embodiment, the frequency identification device includes: permanent magnet 14 and magnetic switch assembly 13.
The permanent magnet 14 is arranged on the periphery of the variable stroke connecting rod assembly, and the magnetic switch assembly 13 is arranged on the periphery of the sleeve 12 of the free piston engine and is connected with the control system through a signal lead.
The control unit ECU 27 transmits the current operating frequency of the linear motor mover 20 to the host computer 28 for determining the current operating frequency of the linear motor mover 20 and issuing a corresponding instruction to the free piston internal combustion generator.
In one possible implementation manner, the frequency measurement mode of the frequency identification device is specifically:
Wherein f n represents the instantaneous frequency at the nth cycle, T n represents the period at the nth cycle, and T n is specifically:
Tn＝tn+2-tn
Where t n+2 represents the time when the permanent magnet 14 reaches the position of the magnetic switch assembly 13 in the n+2th cycle, and t n represents the time when the permanent magnet 14 reaches the position of the magnetic switch assembly 13 in the n-th cycle.
In the present invention, the operating state of the linear motor mover 20, including the condition of varying the frequency and the operating period, can be monitored in real time by measuring the instantaneous frequency and period. The accurate frequency measurement is helpful for the control system to know the running condition of the engine more accurately, and the real-time performance and the response of the system are improved, so that the free piston internal combustion generator system can run efficiently and stably under different working conditions.
In one possible embodiment, the state recognition device includes: a cylinder wall temperature sensor 23, an exhaust gas temperature sensor 24, and an air-fuel ratio analyzer 25.
A cylinder wall temperature sensor 23 is provided at the outer periphery of the cylinder head 4 for detecting the cylinder wall temperature to determine the current cooling condition of the free piston internal combustion generator and to give a corresponding command to the free piston internal combustion generator. Specifically, the control unit ECU 27 of the free piston internal combustion generator acquisition control system is connected with a signal lead. The control unit ECU 27 sends the current cylinder wall temperature of the linear motor mover 20 to the host computer 28 to determine the current cooling condition of the free piston internal combustion generator and to issue a corresponding command to the free piston internal combustion generator.
An exhaust gas temperature sensor 24 is provided at the mouth of the exhaust pipe 6 for detecting the exhaust gas temperature to determine the current cold start condition of the free piston internal combustion generator and to give a corresponding command to the free piston internal combustion generator. Specifically, the control unit ECU 27 of the free piston internal combustion generator collection control system is connected with a signal lead. The control unit ECU 27 sends the current exhaust temperature of the linear motor mover 20 to the host computer 28 to determine the current cold start condition of the free piston internal combustion generator and issue a corresponding command to the free piston internal combustion generator.
The air-fuel ratio analyzer 25 is disposed at the initial end of the exhaust pipe 6, and is used for detecting whether the air intake amount reaches the standard, so as to determine the current air intake condition of the free piston internal combustion generator and send out a corresponding instruction to the free piston internal combustion generator. Specifically, the control unit ECU 27 of the free piston internal combustion generator collection control system is connected with a signal lead. The control unit ECU 27 sends the current intake air amount of the linear motor mover 20 to the host computer 28 to determine the current intake air condition of the free piston internal combustion generator and issue a corresponding instruction to the free piston internal combustion generator.
In one possible implementation, the control system: comprises a host computer 28, a control unit ECU 27, a motor controller and an in-cylinder pressure sensor 1. The host computer 28 is in signal connection with the control unit ECU 27.
The control unit ECU 27 is connected to the linear motor, the host computer 28, the fuel injector 3, the spark plug, the in-cylinder pressure sensor 1, the servo motor 19, the frequency identification device, and the state identification device, respectively.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
According to the invention, the length of the variable stroke connecting rod is controlled to be lengthened or shortened by the control system so as to change the running stroke of the engine and adjust the running frequency, so that the problems of cooling, ventilation, starting and the like of the free piston internal combustion generator under the environmental conditions of high temperature, plateau and alpine regions are solved, the adaptability of the free piston internal combustion generator to external environments and working conditions is improved, the service life, the combustion efficiency and the starting performance of the generator can be improved by adjusting the running stroke and the frequency of the engine in real time, and therefore, the application requirements of the free piston internal combustion generator under various severe environmental conditions are better adapted, and the application and development of the free piston internal combustion generator in extreme environmental regions are promoted.
Referring to fig. 2 of the specification, a schematic flow chart of a control method provided by the invention is shown.
The invention also provides a control method which is applied to the free piston internal combustion generator system adaptable to various extreme environments and comprises the following steps:
S1: the cylinder wall temperature is detected through the state recognition device, the current cooling condition of the free piston internal combustion generator is determined, when the temperature is too high, the variable stroke connecting rod assembly is controlled by the control system to increase the length of the connecting rod, the running stroke of the engine is improved, the running frequency is reduced, the time of each cycle is increased, and more time is provided for heat dissipation.
It should be noted that in high temperature areas, the cooling system of the free piston generator may be at risk of overheating. The temperature of the cylinder cover 4 is detected through the cylinder wall temperature sensor 23 to determine the current cooling condition of the free piston internal combustion generator, when the temperature is higher than 110 ℃, the upper computer 28 sends a command to the control unit ECU 27, the control unit ECU 27 controls the servo motor 19 of the variable stroke connecting rod to increase the length of the connecting rod so as to be used for lifting the running stroke of the engine and reducing the running frequency, when the frequency recognition device detects that the frequency is reduced to 15Hz, the control unit ECU 27 sends the current running frequency of the linear motor rotor 20 to the upper computer 28 without increasing the length of the variable stroke connecting rod, and in the adjusting mode, the time of each cycle can be increased, so that more time is provided for heat dissipation, and the possible overheat risk of a cooling system of the free piston generator in a high-temperature area is reduced.
S2: the state recognition device is used for detecting whether the air inflow reaches the standard or not, determining the current air inflow condition of the free piston internal combustion generator, and when the air inflow is low, controlling the variable stroke connecting rod assembly to increase the length of the connecting rod through the control system, improving the running stroke of the engine, reducing the running frequency, and increasing the ventilation time of each cycle, so that the air inflow in each cycle cylinder is increased.
In the plateau region, the lean air may reduce the intake air amount, which affects the combustion efficiency and the power output. When the air-fuel ratio is lower than 14.7, the upper computer 28 sends a command to the control unit ECU 27, the control unit ECU 27 controls the servo motor 19 of the variable stroke connecting rod to increase the length of the connecting rod for improving the running stroke of the engine and reducing the running frequency, when the frequency recognition device detects that the frequency is reduced to 20Hz, the control unit ECU 27 sends the current running frequency of the linear motor rotor 20 to the upper computer 28, the length of the variable stroke connecting rod is not increased any more, and the time of each cycle can be increased by the adjustment mode, so that the air input in the cylinder of each cycle is increased, and the problem that the air input of a cooling system of a free piston generator is insufficient in a plateau area is solved.
S3: the state recognition device detects the exhaust temperature, the current cold engine starting condition of the free piston internal combustion generator is determined, when the exhaust temperature is lower, the control system controls the variable stroke connecting rod assembly to shorten the length of the connecting rod, the running stroke of the engine is reduced, the running frequency is increased, and the heat is rapidly accumulated to realize the stable starting of the free piston internal combustion generator.
In the alpine region, the extremely low temperature may cause the engine to be difficult to start. When the exhaust temperature sensor 24 detects the exhaust temperature, and when the exhaust temperature is lower than 200 ℃, the upper computer 28 sends a command to the control unit ECU 27, the control unit ECU 27 controls the servo motor 19 of the variable stroke connecting rod to reduce the length of the connecting rod, so as to reduce the running stroke of the engine, raise the running frequency, and when the frequency recognition device detects that the frequency is raised to 45Hz, the control unit ECU 27 sends the current running frequency of the linear motor rotor 20 to the upper computer 28, so that the length of the variable stroke connecting rod is not reduced any more, and the running frequency of the engine can be increased by the adjustment mode. Therefore, the stable starting of the free piston internal combustion generator is realized by rapidly accumulating heat, and the problem that the engine of the free piston internal combustion generator is difficult to start in alpine regions is solved.
Alternatively, the cylinder wall temperature is measured by a cylinder wall temperature sensor 23 in the state recognition means.
Alternatively, the intake air amount is measured by the air-fuel ratio analyzer 25 in the state recognition device.
Alternatively, the exhaust gas temperature is measured by an exhaust gas temperature sensor 24 in the state recognition device.
The technical scheme provided by the embodiment of the invention has the beneficial effects that at least:
According to the invention, the length of the variable stroke connecting rod is controlled to be lengthened or shortened by the control system so as to change the running stroke of the engine and adjust the running frequency, so that the problems of cooling, ventilation, starting and the like of the free piston internal combustion generator under the environmental conditions of high temperature, plateau and alpine regions are solved, the adaptability of the free piston internal combustion generator to external environments and working conditions is improved, the service life, the combustion efficiency and the starting performance of the generator can be improved by adjusting the running stroke and the frequency of the engine in real time, and therefore, the application requirements of the free piston internal combustion generator under various severe environmental conditions are better adapted, and the application and development of the free piston internal combustion generator in extreme environmental regions are promoted.
The following points need to be described:
(1) The drawings of the embodiments of the present invention relate only to the structures related to the embodiments of the present invention, and other structures may refer to the general designs.
(2) In the drawings for describing embodiments of the present invention, the thickness of layers or regions is exaggerated or reduced for clarity, i.e., the drawings are not drawn to actual scale. It will be understood that when an element such as a layer, film, region or substrate is referred to as being "on" or "under" another element, it can be "directly on" or "under" the other element or intervening elements may be present.
(3) The embodiments of the invention and the features of the embodiments can be combined with each other to give new embodiments without conflict.
The present invention is not limited to the above embodiments, but the scope of the invention is defined by the claims.
Claims (10)
1. A free piston internal combustion generator system adaptable to a plurality of extreme environments, comprising: the device comprises a free piston engine, a linear motor, a frequency identification device, a state identification device and a control system;
The piston of the free piston engine is connected with the linear motor rotor of the linear motor through a variable stroke connecting rod assembly;
A frequency identification device is arranged between the sleeve of the free piston engine and the variable stroke connecting rod assembly, the frequency identification device is connected with a control system through a signal lead, and the frequency identification device is used for determining the current running frequency of the linear motor rotor;
The state recognition device is connected with the control system through a signal lead and is used for determining the current environment state;
The control system is used for adjusting the length of the connecting rod of the variable stroke connecting rod assembly according to the current environmental state, adjusting the running stroke of the engine and adjusting the running frequency.
2. The free-piston internal combustion generator system of claim 1, wherein the variable stroke connecting rod assembly comprises: the device comprises a connecting rod, a connecting rod piston, a connecting rod sleeve, a connecting rod guide rail, a stud and a servo motor;
The connecting rod and the connecting rod piston are assembled to form a connecting rod moving end, and the connecting rod moving end is slidably arranged in the connecting rod sleeve through the connecting rod guide rail;
the connecting rod and the connecting rod piston are internally provided with a threaded structure, and are matched with the servo motor through the stud.
3. The free-piston internal combustion generator system of claim 1, wherein the frequency identification means comprises: a permanent magnet and a magnetic switch assembly;
The permanent magnet is arranged on the periphery of the variable stroke connecting rod assembly, and the magnetic switch assembly is arranged on the periphery of the sleeve of the free piston engine and is connected with the control system through a signal lead.
4. A free-piston internal combustion generator system according to claim 3, characterized in that the frequency identification means is arranged to measure the frequency in the following manner:
Wherein f n represents the instantaneous frequency at the nth cycle, T n represents the period at the nth cycle, and T n is specifically:
Tn＝tn+2-tn
Where t n+2 represents the time when the permanent magnet reaches the position of the magnetic switch assembly in the n+2th cycle, and t n represents the time when the permanent magnet reaches the position of the magnetic switch assembly in the n-th cycle.
5. The free-piston internal combustion engine generator system of claim 1, wherein the state recognition means comprises: a cylinder wall temperature sensor, an exhaust gas temperature sensor, and an air-fuel ratio analyzer;
The cylinder wall temperature sensor is arranged on the periphery of the cylinder cover and is used for detecting the cylinder wall temperature so as to determine the current cooling condition of the free piston internal combustion generator and send out corresponding instructions to the free piston internal combustion generator;
The exhaust temperature sensor is arranged at the exhaust pipe orifice and is used for detecting the exhaust temperature so as to determine the current cold engine starting condition of the free piston internal combustion generator and send out a corresponding instruction to the free piston internal combustion generator;
The air-fuel ratio analyzer is arranged at the initial end of the exhaust pipe and is used for detecting whether the air inflow reaches the standard or not so as to determine the current air inflow condition of the free piston internal combustion generator and send out corresponding instructions to the free piston internal combustion generator.
6. The free-piston internal combustion generator system of claim 1, wherein the control system: comprises an upper computer, a control unit ECU, a motor controller and an in-cylinder pressure sensor; the upper computer is in signal connection with the control unit ECU;
The control unit ECU is respectively connected with the linear motor, the upper computer, the oil sprayer, the spark plug, the in-cylinder pressure sensor, the servo motor, the frequency identification device and the state identification device.
7. A control method applied to the free piston internal combustion generator system adaptable to a plurality of extreme environments as defined in any one of claims 1 to 6, wherein the control method includes:
detecting the temperature of the cylinder wall through the state identification device, determining the current cooling condition of the free piston internal combustion generator, and controlling the variable stroke connecting rod assembly to increase the length of the connecting rod through the control system when the temperature is too high, so that the running stroke of the engine is improved, the running frequency is reduced, the time of each cycle is increased, and more time is provided for heat dissipation;
detecting whether the air inflow reaches the standard or not through the state identification device, determining the current air inflow condition of the free piston internal combustion generator, controlling the variable stroke connecting rod assembly to increase the length of the connecting rod through the control system when the air inflow is lower, improving the running stroke of the engine, reducing the running frequency, and increasing the ventilation time of each cycle, thereby increasing the air inflow in each cycle;
And when the exhaust temperature is lower, the control system controls the variable stroke connecting rod assembly to shorten the length of the connecting rod, reduce the running stroke of the engine, increase the running frequency and quickly accumulate heat to realize the stable starting of the free piston internal combustion generator.
8. The control method according to claim 7, characterized in that the cylinder wall temperature is measured by a cylinder wall temperature sensor in the state recognition means.
9. The control method according to claim 7, characterized in that the intake air amount is measured by an air-fuel ratio analyzer in the state recognition means.
10. The control method according to claim 7, characterized in that the exhaust gas temperature is measured by an exhaust gas temperature sensor in the state recognition device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410362079.6A CN118188153A (en) | 2024-03-28 | 2024-03-28 | Free piston internal combustion generator system adaptable to various extreme environments |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410362079.6A CN118188153A (en) | 2024-03-28 | 2024-03-28 | Free piston internal combustion generator system adaptable to various extreme environments |
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| Publication Number | Publication Date |
|---|---|
| CN118188153A true CN118188153A (en) | 2024-06-14 |
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|---|---|---|---|
| CN202410362079.6A Pending CN118188153A (en) | 2024-03-28 | 2024-03-28 | Free piston internal combustion generator system adaptable to various extreme environments |
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| Country | Link |
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| CN (1) | CN118188153A (en) |
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2024
- 2024-03-28 CN CN202410362079.6A patent/CN118188153A/en active Pending
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