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CN113047949B - Split-cylinder free piston generator based on PID closed-loop control - Google Patents

Split-cylinder free piston generator based on PID closed-loop control Download PDF

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Publication number
CN113047949B
CN113047949B CN202110269874.7A CN202110269874A CN113047949B CN 113047949 B CN113047949 B CN 113047949B CN 202110269874 A CN202110269874 A CN 202110269874A CN 113047949 B CN113047949 B CN 113047949B
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pressure
generator set
low
pressure cylinder
linear generator
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CN113047949A (en
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刘龙
刘俊杰
梅齐昊
赵豪
许智淳
唐元亨
安琛
韩笑
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Harbin Engineering University
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Harbin Engineering University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B71/00—Free-piston engines; Engines without rotary main shaft
    • F02B71/04—Adaptations of such engines for special use; Combinations of such engines with apparatus driven thereby
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B33/00—Engines characterised by provision of pumps for charging or scavenging
    • F02B33/02—Engines with reciprocating-piston pumps; Engines with crankcase pumps
    • F02B33/06—Engines with reciprocating-piston pumps; Engines with crankcase pumps with reciprocating-piston pumps other than simple crankcase pumps
    • F02B33/22—Engines with reciprocating-piston pumps; Engines with crankcase pumps with reciprocating-piston pumps other than simple crankcase pumps with pumping cylinder situated at side of working cylinder, e.g. the cylinders being parallel
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B41/00—Engines characterised by special means for improving conversion of heat or pressure energy into mechanical power
    • F02B41/02—Engines with prolonged expansion
    • F02B41/06—Engines with prolonged expansion in compound cylinders
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D29/00—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto
    • F02D29/06—Controlling engines, such controlling being peculiar to the devices driven thereby, the devices being other than parts or accessories essential to engine operation, e.g. controlling of engines by signals external thereto peculiar to engines driving electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D41/0007—Controlling intake air for control of turbo-charged or super-charged engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K35/00—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit
    • H02K35/02—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit with moving magnets and stationary coil systems
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K7/00—Arrangements for handling mechanical energy structurally associated with dynamo-electric machines, e.g. structural association with mechanical driving motors or auxiliary dynamo-electric machines
    • H02K7/18—Structural association of electric generators with mechanical driving motors, e.g. with turbines
    • H02K7/1869—Linear generators; sectional generators
    • H02K7/1876—Linear generators; sectional generators with reciprocating, linearly oscillating or vibrating parts
    • H02K7/1884—Linear generators; sectional generators with reciprocating, linearly oscillating or vibrating parts structurally associated with free piston engines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
    • F02B75/00—Other engines
    • F02B75/16—Engines characterised by number of cylinders, e.g. single-cylinder engines
    • F02B75/18—Multi-cylinder engines
    • F02B2075/1804—Number of cylinders
    • F02B2075/1808—Number of cylinders two
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1401—Introducing closed-loop corrections characterised by the control or regulation method
    • F02D2041/1409—Introducing closed-loop corrections characterised by the control or regulation method using at least a proportional, integral or derivative controller
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)

Abstract

一种基于PID闭环控制的分缸式自由活塞发电机，属于动力能源技术领域。本发明解决了现有的分缸式自由活塞发电机发电效率低且结构强度及安全性差的问题。一种基于PID闭环控制的分缸式自由活塞发电机，它包括控制系统、第一直线发电机组、第二直线发电机组、布置在第一直线发电机组两端的两个高压气缸以及布置在第二直线发电机组两端的两个低压气缸，燃烧后的工质先在高压气缸中进行第一阶段膨胀，然后又在低压气缸中进行第二阶段膨胀，有效地提高了废气中的能量利用率，增加了膨胀功，提高自由活塞发电机的热效率和发电效率。采用控制系统实现高压气缸与低压气缸的同步运动，减少了机械摩擦损失提高能量的利用率，提高了系统的结构强度和安全性。

Figure 202110269874

The utility model relates to a split-cylinder free-piston generator based on PID closed-loop control, belonging to the technical field of power energy. The invention solves the problems of low power generation efficiency and poor structural strength and safety of the existing split-cylinder free-piston generator. A split-cylinder free-piston generator based on PID closed-loop control includes a control system, a first linear generator set, a second linear generator set, two high-pressure cylinders arranged at both ends of the first linear generator set, and two high-pressure cylinders arranged at both ends of the first linear generator set. The two low-pressure cylinders at both ends of the second linear generator set, the working fluid after combustion is first expanded in the high-pressure cylinder, and then expanded in the second-stage in the low-pressure cylinder, which effectively improves the energy utilization rate in the exhaust gas , increasing the expansion work and improving the thermal efficiency and power generation efficiency of the free-piston generator. The control system is used to realize the synchronous movement of the high-pressure cylinder and the low-pressure cylinder, which reduces the mechanical friction loss, improves the utilization rate of energy, and improves the structural strength and safety of the system.

Figure 202110269874

Description

Split-cylinder free piston generator based on PID closed-loop control
Technical Field
The invention relates to a cylinder-separated free piston generator based on PID closed-loop control, and belongs to the technical field of power energy.
Background
With the continuous development of society, the demand of people on energy is increasing day by day, and the energy problem becomes the main problem restricting the further development of various industries. Among various forms of energy, electric energy is one of the most widely used energy, and electric energy is mainly provided by diesel engines in the industries of vehicles, ships, and the like. In the traditional diesel engine power generation process, the energy transmission form is firstly that the chemical energy of fuel is converted into mechanical energy output by a crankshaft through diesel engine combustion, and then the mechanical energy drives a motor to generate power and convert the power into electric energy. The whole energy conversion process is carried out through a plurality of steps, and meanwhile, a large part of complex mechanical structures of the diesel engine are lost, so that the whole power generation efficiency is low. Free piston generator has coupled free piston generator and linear electric motor's operating characteristics, has simplified most mechanical structure to can effectively reduce the loss that mechanical structure friction etc. caused, promote whole generating efficiency, compare in traditional internal-combustion engine power generation process have higher generating efficiency and economic performance, consequently are receiving more and more attention.
Aiming at the common free piston generator, because a crank connecting rod structure is cancelled, the mechanical friction between a piston and a cylinder sleeve is reduced, the mechanical efficiency is improved, but the structure in the cylinder is not changed greatly compared with the common internal combustion engine, the working cycle in the cylinder is the same as that of the common internal combustion engine, and the heat efficiency of the integral combustion is not improved.
In order to improve the overall combustion thermal efficiency of the free piston generator, a working circulation mode of the split-cylinder thermodynamic circulation system is provided. However, the motion of the low-pressure cylinder piston is realized through the crank connecting rod mechanism, and the mechanical energy generated by the motion of the low-pressure cylinder piston cannot be utilized to convert the low-pressure cylinder piston into electric energy, so that the further optimization of the power generation efficiency of the free piston generator is hindered.
Although the free piston generator based on the cylinder-divided thermal circulation system realizes full utilization of mechanical energy of the low-pressure cylinder, the free piston generator relies on a working circulation mode to improve the power generation efficiency of the free piston generator, and the realization of the working circulation of the free piston generator must ensure the synchronous motion of the low-pressure cylinder and the high-pressure cylinder piston, so that the realization of the synchronous motion of the high-pressure cylinder and the low-pressure cylinder piston in a reasonable mode is very important.
The existing free piston generator based on the split-cylinder type thermal circulation system adopts a mechanical transmission mode to realize the synchronous motion of a high-pressure cylinder and a low-pressure cylinder, so that the mechanical friction loss is increased to reduce the generating efficiency of the free piston generator, and the structural strength and the safety of the system are reduced.
Disclosure of Invention
The invention aims to solve the problems of low power generation efficiency and poor structural strength and safety of the conventional split-cylinder free piston generator, and further provides a split-cylinder free piston generator based on PID (proportion integration differentiation) closed-loop control.
The technical scheme adopted by the invention for solving the technical problems is as follows:
a cylinder-separating free piston generator based on PID closed-loop control comprises a control system, a first linear generator set, a second linear generator set, two high-pressure cylinders arranged at two ends of the first linear generator set and two low-pressure cylinders arranged at two ends of the second linear generator set,
the first linear generator set comprises a shell, a rotor mandrel movably arranged on the shell in a penetrating mode, a stator coil fixedly arranged in the shell and coaxially sleeved outside the rotor mandrel, and a generator rotor coaxially and fixedly arranged on the rotor mandrel and located between the stator coil and the rotor mandrel; the second linear generator set has the same structure composition with the first linear generator set;
each high-pressure cylinder comprises a high-pressure cylinder body and a high-pressure piston, a fuel injector, a high-pressure air inlet valve and a high-pressure exhaust valve are mounted at the closed end of the high-pressure cylinder body, the two high-pressure pistons are fixedly connected with two ends of a rotor mandrel of a first linear generator set respectively, each low-pressure cylinder comprises a low-pressure cylinder body and a low-pressure piston, a low-pressure air inlet valve, a low-pressure exhaust valve, an exhaust gas inlet and an air outlet valve are mounted at the closed end of the low-pressure cylinder body, the two low-pressure pistons are fixedly connected with two ends of a rotor mandrel of a second linear generator set respectively, an intercooler is connected between the high-pressure air inlet valve on the high-pressure cylinder and the air outlet valve on the low-pressure cylinder which are positioned on the same side, and an exhaust gas communicating pipe is connected between the high-pressure exhaust valve on the high-pressure cylinder and the exhaust gas inlet on the low-pressure cylinder which are positioned on the same side;
the control system comprises a first displacement sensor, a second displacement sensor and a PID controller, wherein the first displacement sensor is installed on a rotor mandrel of the first linear generator set, the second displacement sensor is installed on a rotor mandrel of the second linear generator set, and the PID controller is connected with stator coils in the first displacement sensor, the second displacement sensor and the second linear generator set respectively.
Furthermore, in each linear generator set, springs are respectively and fixedly arranged between two ends of the rotor of the generator and the shell.
Further, the number of the high-pressure intake valves mounted on each high-pressure cylinder is two.
Further, the stroke of the low pressure cylinder is the same as that of the high pressure cylinder.
Furthermore, the volume and the inner diameter of the high-pressure cylinder body are both smaller than those of the low-pressure cylinder body.
Further, piston rings are mounted on the high-pressure piston and the low-pressure piston.
Further, cylinder covers are mounted on the high-pressure cylinder body and the low-pressure cylinder body, and a temperature sensor and a pressure sensor are mounted on each cylinder cover.
Compared with the prior art, the invention has the following effects:
the air is firstly compressed in the first stage in the low-pressure cylinder group in the internal combustion engine set and then compressed in the second stage in the high-pressure cylinder, so that the air inlet pressure of the internal combustion engine is effectively improved, the average effective pressure in the working process is favorably improved, and the heat efficiency and the power generation efficiency of the free piston generator are improved.
The burnt working medium is firstly expanded in a first stage in the high-pressure cylinder and then expanded in a second stage in the low-pressure cylinder, so that the energy utilization rate of waste gas is effectively improved, the expansion work is increased, and the heat efficiency and the power generation efficiency of the free piston generator are further improved.
The control system is adopted to realize the synchronous motion of the high-pressure cylinder and the low-pressure cylinder, so that the mechanical friction loss is reduced, the utilization rate of energy is improved, and the structural strength and the safety of the system are improved.
Drawings
FIG. 1 is a schematic front view of the present application;
fig. 2 is a schematic diagram of the connection between the high-pressure cylinder and the low-pressure cylinder in the internal combustion engine set.
Detailed Description
The first embodiment is as follows: the embodiment is described by combining fig. 1 and fig. 2, a cylinder-divided free piston generator based on PID closed-loop control comprises a control system, a first linear generator set, a second linear generator set, two high-pressure cylinders arranged at two ends of the first linear generator set and two low-pressure cylinders arranged at two ends of the second linear generator set,
the first linear generator set comprises a shell 2, a rotor mandrel 4 movably arranged on the shell 2 in a penetrating mode, a stator coil 1 fixedly arranged in the shell 2 and coaxially sleeved outside the rotor mandrel 4, and a generator rotor 3 coaxially and fixedly arranged on the rotor mandrel 4 and located between the stator coil 1 and the rotor mandrel 4; the second linear generator set has the same structure composition with the first linear generator set;
each high-pressure cylinder comprises a high-pressure cylinder body 14 and a high-pressure piston 15, an oil injector 16, a high-pressure air inlet valve 13 and a high-pressure exhaust valve 17 are installed at the closed end of the high-pressure cylinder body 14, the two high-pressure pistons 15 are fixedly connected with two ends of a rotor mandrel 4 of the first linear generator set respectively, each low-pressure cylinder comprises a low-pressure cylinder body 8 and a low-pressure piston 9, a low-pressure air inlet valve 6 is installed at the closed end of the low-pressure cylinder body 8, two low-pressure pistons 9 are respectively fixedly connected with two ends of a rotor mandrel 4 of the second linear generator set, an intercooler 12 is connected between a high-pressure air inlet valve 13 on the high-pressure cylinder on the same side and an air outlet valve 10 on the low-pressure cylinder, and a waste gas communicating pipe 18 is connected between a high-pressure air outlet valve 17 on the high-pressure cylinder on the same side and a waste gas inlet 11 on the low-pressure cylinder;
the control system comprises a first displacement sensor 20, a second displacement sensor 21 and a PID controller 19, wherein the first displacement sensor 20 is installed on a rotor core shaft 4 of a first linear generator set, the second displacement sensor 21 is installed on a rotor core shaft 4 of a second linear generator set, and the PID controller 19 is respectively connected with the first displacement sensor 20, the second displacement sensor 21 and stator coils 1 in the second linear generator set.
The second linear generator set and the first linear generator set have the same structural composition but different specific parameters, such as: the diameters of the two rotor mandrels are different, and the number of coils is different. The diameter of a rotor mandrel of the second linear generator set is larger, so that the rotor mandrel is conveniently connected with a low-voltage piston with a larger size, and the number of coils of the second linear generator set is smaller, so that the loss of electric energy is reduced when the generator is used as a motor.
The working principle is as follows:
the high-pressure cylinder, the low-pressure cylinder, the intercooler and the waste gas communicating pipe form an internal combustion engine set.
The internal combustion engine set drives the rotor mandrel 4 to move, and the generator rotor 3 cuts the magnetic induction lines generated by the stator coil 1 to generate electricity.
Air enters a low-pressure cylinder 8 from a low-pressure air inlet valve 6, is compressed in a first stage under the action of a low-pressure piston 9, and enters an intercooler 12 for cooling from an air outlet valve 10.
The compressed air in the intercooler 12 enters the high pressure cylinder 14 through the high pressure intake valve 13 and undergoes a second stage compression by the action of the high pressure piston 15.
After the compression process is finished, the fuel oil is sprayed by the fuel injector 16, the combustion process occurs in the high-pressure cylinder 14, the fuel gas pushes the high-pressure piston 15 to perform first-stage expansion, the expanded fuel gas flows out to the waste gas communicating pipe 18 through the high-pressure exhaust valve 17, then flows into the low-pressure cylinder 8 through the waste gas inlet 11 to push the low-pressure piston 9 to perform second-stage expansion, and finally the expanded fuel gas is discharged to the external environment through the low-pressure exhaust valve 7.
The high-pressure cylinder adopts a compression ignition method, and the mixed gas is self-ignited after oil injection.
The air is firstly compressed in the first stage in the low-pressure cylinder group and then compressed in the second stage in the high-pressure cylinder, so that the air inlet pressure of the internal combustion engine is effectively improved, the average effective pressure in the working process is favorably improved, and the heat efficiency and the power generation efficiency of the free piston generator are improved.
The burnt working medium is firstly expanded in a first stage in the high-pressure cylinder and then expanded in a second stage in the low-pressure cylinder, so that the energy utilization rate of waste gas is effectively improved, the expansion work is increased, and the heat efficiency and the power generation efficiency of the free piston generator are further improved.
The two displacement sensors feed the motion conditions of the two rotor mandrels 4 back to the PID controller 19, if the two rotor mandrels 4 move synchronously, the stator coil 1 in the first linear generator set transmits power outwards, the first linear generator set operates as a generator, if the two rotor mandrels 4 move asynchronously, the stator coil 1 in the first linear generator set transmits power, the first linear generator set operates as a motor, the motion conditions of the two rotor mandrels 4 are fed back to the PID controller 19 in real time, the PID controller 19 controls the power transmission current to the stator coil 1 in the first linear generator set, the motion speed adjustment of the rotor mandrels 4 in the first linear generator set is realized, and the motion synchronization of the two rotor mandrels 4 is further realized.
The control system is adopted to realize the synchronous motion of the high-pressure cylinder and the low-pressure cylinder, so that the mechanical friction loss is reduced, the utilization rate of energy is improved, and the structural strength and the safety of the system are improved.
In each linear generator set, springs 5 are respectively and fixedly arranged between two ends of a generator rotor 3 and the shell 2. The design realizes limiting the motion of the generator rotor 3 through the spring 5, and the rotor core shaft is fixedly connected with the piston, so that the motion of the piston can be limited.
The number of the high-pressure intake valves 13 mounted on each high-pressure cylinder 14 is two. By such design, the volumetric efficiency of the high-pressure cylinder 14 is improved.
The low pressure cylinder has the same stroke as the high pressure cylinder.
The volume and the inner diameter of the high-pressure cylinder 14 are smaller than those of the low-pressure cylinder 8. The utility model provides a generator is in high temperature environment, and the high-pressure cylinder volume and the surface area that are responsible for the burning are less, can reduce the heat transfer loss of working process, improve energy utilization.
Piston rings are mounted on the high-pressure piston 15 and the low-pressure piston 9. By the design, the lubricating effect in the cylinder is improved, and air and fuel gas leakage is prevented.
The high-pressure cylinder body 14 and the low-pressure cylinder body 8 are both provided with cylinder covers, and each cylinder cover is provided with a temperature sensor and a pressure sensor. By the design, the working state in the cylinder body is effectively monitored.

Claims (7)

1. A cylinder-separating free piston generator based on PID closed-loop control is characterized in that: it comprises a control system, a first linear generator set, a second linear generator set, two high-pressure cylinders arranged at two ends of the first linear generator set and two low-pressure cylinders arranged at two ends of the second linear generator set,
the first linear generator set comprises a shell (2), a rotor mandrel (4) movably arranged on the shell (2) in a penetrating mode, a stator coil (1) fixedly installed in the shell (2) and coaxially sleeved outside the rotor mandrel (4), and a generator rotor (3) coaxially and fixedly installed on the rotor mandrel (4) and located between the stator coil (1) and the rotor mandrel (4); the second linear generator set has the same structure composition with the first linear generator set;
each high-pressure cylinder comprises a high-pressure cylinder body (14) and a high-pressure piston (15), an oil sprayer (16), a high-pressure air inlet valve (13) and a high-pressure exhaust valve (17) are installed at the closed end of the high-pressure cylinder body (14), the two high-pressure pistons (15) are fixedly connected with the two ends of a rotor mandrel (4) of a first linear generator set respectively, each low-pressure cylinder comprises a low-pressure cylinder body (8) and a low-pressure piston (9), a low-pressure air inlet valve (6), a low-pressure exhaust valve (7), an exhaust air inlet (11) and an air outlet valve (10) are installed at the closed end of the low-pressure cylinder body (8), the two low-pressure pistons (9) are fixedly connected with the two ends of the rotor mandrel (4) of a second linear generator set respectively, and an intercooler (12) is connected between the high-pressure air inlet valve (13) on the high-pressure cylinder at the same side and the air outlet valve (10) on the low-pressure cylinder, a waste gas communicating pipe (18) is connected between a high-pressure exhaust valve (17) on the high-pressure cylinder and a waste gas inlet (11) on the low-pressure cylinder which are positioned on the same side;
the control system comprises a first displacement sensor (20), a second displacement sensor (21) and a PID controller (19), wherein the first displacement sensor (20) is installed on a rotor mandrel (4) of a first linear generator set, the second displacement sensor (21) is installed on a rotor mandrel (4) of a second linear generator set, and the PID controller (19) is respectively connected with the first displacement sensor (20), the second displacement sensor (21) and a stator coil (1) in the second linear generator set;
the two displacement sensors feed the motion conditions of the two rotor mandrels (4) back to the PID controller (19), if the motion of the two rotor mandrels (4) is synchronous, the stator coils (1) in the first linear generator set transmit power outwards, the first linear generator set operates as a generator, if the motion of the two rotor mandrels (4) is asynchronous, the stator coils (1) in the first linear generator set transmit power, the first linear generator set operates as a motor, the motion conditions of the two rotor mandrels (4) are fed back to the PID controller (19) in real time, the PID controller (19) controls the power transmission current of the stator coils (1) in the first linear generator set, the motion speed adjustment of the rotor mandrels (4) in the first linear generator set is realized, and the motion synchronization of the two rotor mandrels (4) is further realized.
2. The split-cylinder free-piston generator based on the PID closed-loop control as claimed in claim 1, wherein: in each linear generator set, springs (5) are fixedly arranged between two ends of a generator rotor (3) and the shell (2) respectively.
3. The free piston generator of claim 1 or 2, wherein: the number of the high-pressure air inlet valves (13) arranged on each high-pressure cylinder body (14) is two.
4. The split-cylinder free-piston generator based on the PID closed-loop control according to claim 3, wherein: the low pressure cylinder has the same stroke as the high pressure cylinder.
5. The PID closed-loop-control-based split-cylinder free-piston generator of claim 4, wherein: the volume and the inner diameter of the high-pressure cylinder (14) are both smaller than those of the low-pressure cylinder (8).
6. The split-cylinder free-piston generator based on the PID closed-loop control as claimed in claim 1, wherein: piston rings are arranged on the high-pressure piston (15) and the low-pressure piston (9).
7. The split-cylinder free-piston generator based on the PID closed-loop control as claimed in claim 1, wherein: the high-pressure cylinder body (14) and the low-pressure cylinder body (8) are both provided with cylinder covers, and each cylinder cover is provided with a temperature sensor and a pressure sensor.
CN202110269874.7A 2021-03-12 2021-03-12 Split-cylinder free piston generator based on PID closed-loop control Active CN113047949B (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202110269874.7A CN113047949B (en) 2021-03-12 2021-03-12 Split-cylinder free piston generator based on PID closed-loop control

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202110269874.7A CN113047949B (en) 2021-03-12 2021-03-12 Split-cylinder free piston generator based on PID closed-loop control

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