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

Info

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
Authority
CN
China
Prior art keywords
pressure
low
generator set
linear generator
pressure cylinder
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Active
Application number
CN202110269874.7A
Other languages
Chinese (zh)
Other versions
CN113047949A (en
Inventor
刘龙
刘俊杰
梅齐昊
赵豪
许智淳
唐元亨
安琛
韩笑
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Harbin Engineering University
Original Assignee
Harbin Engineering University
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Harbin Engineering University filed Critical Harbin Engineering University
Priority to CN202110269874.7A priority Critical patent/CN113047949B/en
Publication of CN113047949A publication Critical patent/CN113047949A/en
Application granted granted Critical
Publication of CN113047949B publication Critical patent/CN113047949B/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Classifications

    • 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

Landscapes

  • 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

A cylinder-separating free piston generator based on PID closed-loop control belongs to the technical field of power energy. The invention solves the problems of low power generation efficiency, poor structural strength and poor safety of the existing split-cylinder free piston generator. 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, wherein a combusted working medium is firstly expanded in the high-pressure cylinders at a first stage and then expanded in the low-pressure cylinders at a second stage, so that the energy utilization rate in waste gas is effectively improved, the expansion work is increased, and the thermal efficiency and the power generation efficiency of the free piston generator are 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.

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

Publications (2)

Publication Number Publication Date
CN113047949A CN113047949A (en) 2021-06-29
CN113047949B true CN113047949B (en) 2021-09-21

Family

ID=76512434

Family Applications (1)

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

Country Status (1)

Country Link
CN (1) CN113047949B (en)

Citations (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB633863A (en) * 1946-02-05 1949-12-30 Raul Pateras Pescara Improvements in power plant comprising internal-combustion-operated free-piston machines
FR2295234A1 (en) * 1974-12-18 1976-07-16 Energiagazdalkodasi Intezet Twin cylinder free piston engine - has output shaft driven through worm and wheel from piston rods
GB1502171A (en) * 1975-01-03 1978-02-22 Direct Power Ltd Opposed piston internal combustion engines
WO1997028362A1 (en) * 1996-01-30 1997-08-07 Kvaerner Asa A method for controlling the stroke of a diesel free-piston gas generator
CN1888402A (en) * 2006-07-20 2007-01-03 上海交通大学 Free-piston type internal combustion engine power generating system
CN101512123A (en) * 2006-07-31 2009-08-19 弗里瑟维斯可变资本股份公司 Two-stroke inner combustion chamber with two pistons in each air cylinder
CN101592077A (en) * 2002-03-15 2009-12-02 先进动力科技公司 Internal-combustion engine
CN101910585A (en) * 2008-03-14 2010-12-08 奥德·伯恩哈德·托基尔德森 Combustion engine having mutually connected pistons
WO2011020988A2 (en) * 2009-08-17 2011-02-24 Isis Innovation Limited Stirling cycle machine
GB201200506D0 (en) * 2012-01-12 2012-02-22 Isis Innovation Stirling cycle machines
WO2012025124A1 (en) * 2010-08-24 2012-03-01 Soeberg Jesper Free-piston engine with linear power generator
CN102639842A (en) * 2009-10-12 2012-08-15 斯德曼数字系统公司 Hydraulic internal combustion engines
CN102996227A (en) * 2011-11-19 2013-03-27 摩尔动力(北京)技术股份有限公司 Split exhaust two-stroke engine
CN103174513A (en) * 2013-03-05 2013-06-26 安徽中鼎动力有限公司 Combustion engine provided with opposed pistons, opposed air cylinders and single crankshaft
CN103233813A (en) * 2013-04-11 2013-08-07 北京理工大学 Ignition-starting-type compression-ignition-type free piston internal combustion power generation power system
CN103233815A (en) * 2013-04-11 2013-08-07 北京理工大学 Free piston linear generator based on waste heat utilization
CN103573406A (en) * 2013-10-28 2014-02-12 北京理工大学 Double-cylinder opposed free-piston internal combustion engine generator
CN103912378A (en) * 2014-04-08 2014-07-09 姚远 Pairwise abreast-arrangement free piston permanent-magnet linear generator
CN104653288A (en) * 2015-01-05 2015-05-27 吉林大学 Free piston generator system using electromagnetic variable valve technique
CN104912660A (en) * 2015-04-17 2015-09-16 华侨大学 Two-cylinder four-stroke hydraulic free piston engine based on electric control compression stroke
CN105464799A (en) * 2014-08-11 2016-04-06 徐建宁 Compound free piston type linear generator
CN105569838A (en) * 2014-10-10 2016-05-11 徐建宁 Electric-started free piston engine
CN106640370A (en) * 2016-11-08 2017-05-10 温后东 Magnetic suspension free piston type six-stroke generator and internal combustion engine and control method for magnetic suspension free piston type six-stroke internal combustion engine
CN109611170A (en) * 2018-11-01 2019-04-12 北京信息科技大学 Free piston expander based on composite power source-linear electric generator vehicle waste heat recovery system
CN109973211A (en) * 2019-03-18 2019-07-05 上海优久信息科技有限公司 Free-piston type linear electric generator
CN110217113A (en) * 2019-06-12 2019-09-10 北京工业大学 Free piston expander-linear electric generator and composite power source stroke-increasing electric automobile
CN111365121A (en) * 2019-12-31 2020-07-03 钱裕智 Linear range-extending generator driven by pre-supercharging exhaust-gas-changing free piston engine
CN111627576A (en) * 2020-06-08 2020-09-04 哈尔滨工程大学 Power supply system of Stirling power generation nuclear reactor for marine application
CN111664002A (en) * 2019-10-13 2020-09-15 熵零技术逻辑工程院集团股份有限公司 Engine
CN111852650A (en) * 2020-07-30 2020-10-30 山东交通学院 Two-stroke free piston internal combustion generator with high expansion ratio
CN111852649A (en) * 2020-07-30 2020-10-30 山东交通学院 Two-stroke Atkinson cycle free piston internal combustion generator

Family Cites Families (14)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB605010A (en) * 1945-12-11 1948-07-14 Vickers Armstrongs Ltd Improvements in or relating to safety devices in free-piston internal combustion engine gas generators
GB737082A (en) * 1951-02-16 1955-09-21 Perrott Francis Cyril Improvements in free-piston compressors or gas generators
DE10254037A1 (en) * 2002-11-20 2004-06-03 Fev Motorentechnik Gmbh Two-stroke free-flight counter-piston internal combustion engine
JP2005155345A (en) * 2003-11-20 2005-06-16 Denso Corp Free-piston engine and generating equipment using the same
US6983724B2 (en) * 2004-05-07 2006-01-10 Ford Global Technologies, Llc Starting a compression ignition free piston internal combustion engine having multiple cylinders
RU2415286C1 (en) * 2010-02-01 2011-03-27 Анатолий Александрович Рыбаков Gas distributing procedure of piston motion synchronisation in free piston gas generator with external combustion chamber
GB2480461B8 (en) * 2010-05-19 2012-11-14 Univ Newcastle Free piston internal combustion engine
US8127544B2 (en) * 2010-11-03 2012-03-06 Paul Albert Schwiesow Two-stroke HCCI compound free-piston/gas-turbine engine
US8413617B2 (en) * 2010-11-23 2013-04-09 Etagen, Inc. High-efficiency two-piston linear combustion engine
CN102877940A (en) * 2012-10-15 2013-01-16 北京理工大学 Starting system of motor type free piston internal combustion power generation device
CN204003096U (en) * 2014-08-11 2014-12-10 徐建宁 Compound free piston type linear electric generator
GB201518833D0 (en) * 2015-10-23 2015-12-09 Univ Newcastle Free piston engine power plant
EP3343001A1 (en) * 2016-12-30 2018-07-04 Kujtim Hyseni Improved free-piston linear apparatus
US10371045B2 (en) * 2017-11-17 2019-08-06 Alan Kent Johnson Free-piston engine

Patent Citations (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB633863A (en) * 1946-02-05 1949-12-30 Raul Pateras Pescara Improvements in power plant comprising internal-combustion-operated free-piston machines
FR2295234A1 (en) * 1974-12-18 1976-07-16 Energiagazdalkodasi Intezet Twin cylinder free piston engine - has output shaft driven through worm and wheel from piston rods
GB1502171A (en) * 1975-01-03 1978-02-22 Direct Power Ltd Opposed piston internal combustion engines
WO1997028362A1 (en) * 1996-01-30 1997-08-07 Kvaerner Asa A method for controlling the stroke of a diesel free-piston gas generator
CN101592077A (en) * 2002-03-15 2009-12-02 先进动力科技公司 Internal-combustion engine
CN1888402A (en) * 2006-07-20 2007-01-03 上海交通大学 Free-piston type internal combustion engine power generating system
CN101512123A (en) * 2006-07-31 2009-08-19 弗里瑟维斯可变资本股份公司 Two-stroke inner combustion chamber with two pistons in each air cylinder
CN101910585A (en) * 2008-03-14 2010-12-08 奥德·伯恩哈德·托基尔德森 Combustion engine having mutually connected pistons
WO2011020988A2 (en) * 2009-08-17 2011-02-24 Isis Innovation Limited Stirling cycle machine
CN102639842A (en) * 2009-10-12 2012-08-15 斯德曼数字系统公司 Hydraulic internal combustion engines
WO2012025124A1 (en) * 2010-08-24 2012-03-01 Soeberg Jesper Free-piston engine with linear power generator
CN102996227A (en) * 2011-11-19 2013-03-27 摩尔动力(北京)技术股份有限公司 Split exhaust two-stroke engine
GB201200506D0 (en) * 2012-01-12 2012-02-22 Isis Innovation Stirling cycle machines
CN103174513A (en) * 2013-03-05 2013-06-26 安徽中鼎动力有限公司 Combustion engine provided with opposed pistons, opposed air cylinders and single crankshaft
CN103233813A (en) * 2013-04-11 2013-08-07 北京理工大学 Ignition-starting-type compression-ignition-type free piston internal combustion power generation power system
CN103233815A (en) * 2013-04-11 2013-08-07 北京理工大学 Free piston linear generator based on waste heat utilization
CN103573406A (en) * 2013-10-28 2014-02-12 北京理工大学 Double-cylinder opposed free-piston internal combustion engine generator
CN103912378A (en) * 2014-04-08 2014-07-09 姚远 Pairwise abreast-arrangement free piston permanent-magnet linear generator
CN105464799A (en) * 2014-08-11 2016-04-06 徐建宁 Compound free piston type linear generator
CN105569838A (en) * 2014-10-10 2016-05-11 徐建宁 Electric-started free piston engine
CN104653288A (en) * 2015-01-05 2015-05-27 吉林大学 Free piston generator system using electromagnetic variable valve technique
CN104912660A (en) * 2015-04-17 2015-09-16 华侨大学 Two-cylinder four-stroke hydraulic free piston engine based on electric control compression stroke
CN106640370A (en) * 2016-11-08 2017-05-10 温后东 Magnetic suspension free piston type six-stroke generator and internal combustion engine and control method for magnetic suspension free piston type six-stroke internal combustion engine
CN109611170A (en) * 2018-11-01 2019-04-12 北京信息科技大学 Free piston expander based on composite power source-linear electric generator vehicle waste heat recovery system
CN109973211A (en) * 2019-03-18 2019-07-05 上海优久信息科技有限公司 Free-piston type linear electric generator
CN110217113A (en) * 2019-06-12 2019-09-10 北京工业大学 Free piston expander-linear electric generator and composite power source stroke-increasing electric automobile
CN111664002A (en) * 2019-10-13 2020-09-15 熵零技术逻辑工程院集团股份有限公司 Engine
CN111365121A (en) * 2019-12-31 2020-07-03 钱裕智 Linear range-extending generator driven by pre-supercharging exhaust-gas-changing free piston engine
CN111627576A (en) * 2020-06-08 2020-09-04 哈尔滨工程大学 Power supply system of Stirling power generation nuclear reactor for marine application
CN111852650A (en) * 2020-07-30 2020-10-30 山东交通学院 Two-stroke free piston internal combustion generator with high expansion ratio
CN111852649A (en) * 2020-07-30 2020-10-30 山东交通学院 Two-stroke Atkinson cycle free piston internal combustion generator

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
线发电机的方案设计_自由活塞式内燃直线发电机研究进展_二;周志宏;《石油机械》;20031110;第62-64页 *

Also Published As

Publication number Publication date
CN113047949A (en) 2021-06-29

Similar Documents

Publication Publication Date Title
CN201560839U (en) Internal combustion stirling engine
US5557934A (en) Efficient energy conversion apparatus and method especially arranged to employ a stirling engine or alternately arranged to employ an internal combustion engine
CN100577464C (en) Internal combustion-linear generating integrated power system
JP3607909B2 (en) Improvement of free piston engine
JP2002505399A (en) Free piston internal combustion engine
CN1888402A (en) Free-piston type internal combustion engine power generating system
US11549370B2 (en) Systems and methods for a piston engine including a recirculating system using supercritical carbon dioxide
CN113047948B (en) Free piston generator based on rigid connection
US11421586B2 (en) Six-cylinder opposed free piston internal combustion engine generator
WO2014026423A1 (en) Turbine engine using compressed air as working energy source
CN102052149B (en) Passive air-inlet mode diesel linear electromagnetic energy conversion device
US9885324B2 (en) Efficient thermal energy power engine and working method thereof
US10082072B2 (en) High pressure energy storage thermal energy power machine and work-doing method therefor
US11616420B2 (en) Free piston generator based on split thermodynamic cycle
US10208707B2 (en) Efficient thermal energy power device and work-doing method therefor
CN113047949B (en) Split-cylinder free piston generator based on PID closed-loop control
CN102562294B (en) Eight-stroke engine
CN113047954B (en) Free piston generator based on rigid synchronous transmission system
US10927798B2 (en) Thermal energy power device and work-doing method therefor
CN113047953A (en) Single-piston type internal combustion linear generator with two-stage compression expansion cycle
CN113482771B (en) Split-cylinder four-stroke free piston generator and working method
CN117167138A (en) Smooth bore type quaternary difference heat insulation internal combustion engine
CN113047950A (en) Two-cylinder three-piston opposed diesel power generation device
RU2075613C1 (en) Piston internal combustion engine and method of its operation
RU71382U1 (en) POWER UNIT WITH SEPARATED COMPRESSION-EXPANSION PROCESSES

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination
GR01 Patent grant
GR01 Patent grant