CN109653869A - A kind of two-stroke free-piston electricity generation system and its electricity-generating method - Google Patents
A kind of two-stroke free-piston electricity generation system and its electricity-generating method Download PDFInfo
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- CN109653869A CN109653869A CN201910070828.7A CN201910070828A CN109653869A CN 109653869 A CN109653869 A CN 109653869A CN 201910070828 A CN201910070828 A CN 201910070828A CN 109653869 A CN109653869 A CN 109653869A
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Classifications
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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
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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
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
-
- 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
- H02K7/14—Structural association with mechanical loads, e.g. with hand-held machine tools or fans
-
- 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
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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
- F02B75/00—Other engines
- F02B75/02—Engines characterised by their cycles, e.g. six-stroke
- F02B2075/022—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle
- F02B2075/025—Engines characterised by their cycles, e.g. six-stroke having less than six strokes per cycle two
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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
The invention discloses a kind of two-stroke free-piston type electricity generation system and its electricity-generating method, which includes combustion system, return mechanism (11), electric system, electronic control unit (1), power inverter (2) and energy storage device (3).The displacement of free-piston moving parts is controlled by adjusting size and the duration of linear motor middle line loop current, realizes the advantage of free-piston electricity generation system variable compression ratio and route-variable.Free-piston electricity generation system disclosed by the invention is worked using two-stroke cycle, and it is high-efficient, at low cost, discharge is small, fuel universality is wide, compared to small volume shared by homogeneous system, the portable sexual clorminance that there is homogeneous system not have.It can be used for the fields such as stroke lengthening hybrid power automobile, distributed power generation, accessory power supply.
Description
Technical field
The invention belongs to technical field of power generation, in particular to a kind of two-stroke free-piston electricity generation system and its power generation side
Method.
Background technique
Currently, the clean energy resource for finding a kind of sustainable development is current every profession and trade due to energy crisis and environmental pollution
The common problem faced.For auto industry, although pure electric automobile is the main flow direction of future automobile, it is limited by
The limitation of basic science, electric car can't replace the status of conventional truck in all directions, as a result, Developing Hybrid Vehicle Industry at
In order to which orthodox car is to the optimal selection of pure electric automobile transition.
Free-piston electricity generation system eliminates the brace and connecting rod framework in traditional engine construction, starts than conventional crankshafts formula
Machine is compact-sized, and piston not will receive lateral forces during exercise, reduces frictional dissipation.It is since free-piston generates electricity
Uniting has the characteristic of alterable compression ratio, can optimize and emission reduction in conjunction with corresponding operating condition, it may have adapt to the energy of pluralities of fuel
Power.
Free-piston power generation system structure common at present is dual Piston, i.e., combustion chamber placement is in center, both sides difference
It arranges a combustion chamber, is worked using two-stroke cycle, when a combustion chamber is in acting state, push piston for another combustion
The compression stroke for burning room provides energy.This structure requires control system harsh, it is difficult to realize the continuous and steady operation of model machine,
And when using dual Piston structure, working cycles can only use two-stroke cycle, and there has been no realize energy continuous-stable fortune at present
The report of capable dual Piston model machine.
Summary of the invention
The purpose of the present invention is to provide a kind of stable, accurate two-stroke free-piston electricity generation system of control and its
Electricity-generating method.
To achieve the goals above, The technical solution adopted by the invention is as follows:
A kind of two-stroke free-piston electricity generation system, including combustion system, electric system, return mechanism and electronic control
Unit, the combustion system include igniter, engine cylinder head, free-piston, air inlet, scavenging room, exhaust outlet, fuel spray
Injection device and combustion chamber, the fuel injection device and igniter are located at the top of the engine cylinder head, described freely to live
Plug is located inside engine cylinder head, and the space in engine cylinder head above the free-piston is combustion chamber, engine cylinder
Space in head below the free-piston is scavenging room, and air inlet and exhaust outlet are respectively arranged at the side of engine cylinder head
On wall,
The electric system includes coil, electric mover and permanent magnet, and wherein the coil in electric mover is solenoid row
Column, electric mover is fixedly connected with the free-piston constitutes piston motion component, and permanent magnet is located at outside electric mover and is located at
The inside of coil, is provided with the detecting element of piston motion position on piston motion component, and the return mechanism is set to certainly
By the lower part of piston.
Further, the electricity generation system further includes power inverter and energy storage device, and the electronic control unit passes through
Conducting wire is connected with fuel injection device, igniter and power inverter respectively, and power inverter is connected with energy storage device.
Further, it is provided with pressure sensor in the combustion chamber, is provided with displacement sensor on the free-piston,
The pressure sensor is connect with electronic control unit respectively with displacement sensor.
Further, the coil is connect with electronic control unit and power inverter respectively.
Further, the return mechanism is mechanical spring or gas spring or hydraulic return mechanism.
Further, the energy storage device is battery or supercapacitor or combination.
According to the electricity-generating method of two-stroke free-piston electricity generation system described above, comprising the following steps:
Step 1: in system starting, electronic control unit makes department of electrical engineering by controlling the working condition of power inverter
System works in electric model, electric energy is provided from energy storage device to electric system, by controlling the size and Orientation of electric current, motor
Subband free-piston move downward, fresh air is gradually entered in cylinder by air inlet, while the return mechanism of lower section is compressed,
Electric energy is stored as elastic potential energy；
Step 2: after the completion of starting stroke, system enters two stroke operation circulation, and two stroke operation circulation includes compression punching
Journey and expansion stroke, when compression stroke starts, under the action of return mechanism, free-piston is moved upwards, and electric mover is cut
Magnetic induction line power generation is cut, electric energy is by the way that in power inverter deposit energy storage device, piston motion component uplink while is progressively closed off
Exhaust outlet compresses the gaseous mixture in cylinder, when close to compression stroke end, fuel injection device to cylinder injection fuel,
Igniter lights gaseous mixture in compression stroke end, and in compression process, electronic control unit is according to cylinder pressure signal and work
The displacement signal of plug moving parts judges the combustion state of gaseous mixture in cylinder, when gaseous mixture normal combustion in cylinder, electric system
It will be operate in power generation mode in expansion stroke, electric energy storage converted by energy that burning generates, when detecting mixer in cylinder
It burns insufficient or when catching fire, electric system will be operate in electric model in expansion stroke；
Step 3: when electric system is when expansion stroke works in electric model, igniter is in compression stroke foot couple cylinder
Interior gaseous mixture is lighted, and mixture combustion is insufficient in cylinder or is not lighted, and electronic control unit is according to pressure sensor
After signal judges in-cylinder combustion operating condition, electric energy is provided to electric system by power sensor, works in electric system electronic
Mode drives piston motion component to move downward, this process is gradually opened exhaust outlet and air inlet, completes ventilation in cylinder, simultaneously
Downward compression and back apparatus for coating, when free-piston reaches lower reversal point, expansion stroke terminates, and subsequent return mechanism pushes piston fortune
Dynamic component uplink power generation, into compression stroke；
When electric system is when expansion stroke works in power generation mode, igniter is in gaseous mixture in compression stroke foot couple cylinder
It is lighted, gaseous mixture is ignited, and the energy of release pushes piston motion component downlink, and electric mover cutting magnetic induction line generates electricity,
Electronic control unit makes electric system work in power generation mode by controlling power inverter, and power inverter can be passed through by generating electricity
It being stored in energy storage device, piston motion component downlink process is gradually opened exhaust outlet and air inlet, it completes to take a breath in cylinder, while to
Lower compression and back apparatus for coating, when free-piston reaches lower reversal point, expansion stroke terminates, and subsequent return mechanism pushes piston motion
Component uplink power generation, into compression stroke.
Compared with prior art, the present invention its remarkable advantage is:
Free-piston electricity generation system of the invention is recycled using two stroke operation, automatically controlled to pass through piston position, in-cylinder pressure
And the signals such as electric current, judge in-cylinder combustion state, then the working condition by power inverter to electric system, motor electricity
The size of stream and direction are controlled, to guarantee the continuous and steady operation of system, while being controlled the size of electric current and being continued
Time can also change the reversal point up and down of piston motion component, realize alterable compression ratio, this of the invention freely to live
Filling in electricity generation system has good fuel universality, and free-piston electricity generation system disclosed by the invention uses two-stroke cycle work
Make, it is high-efficient, at low cost, discharge is small, fuel universality is wide, compared to small volume shared by homogeneous system, with homogeneous system
The portable sexual clorminance not having.
Detailed description of the invention
Fig. 1 is two-stroke free-piston electricity generation system of the present invention composition figure.
Fig. 2 is two-stroke free-piston electricity generation system working cycles schematic diagram of the present invention.
In figure: 1. electronic control units；2. power inverter；3. energy storage device；4. igniter；5. engine cylinder head；
6. free-piston；7. air inlet；8. scavenging room；9. coil；10. electric mover；11. return mechanism；12. permanent magnet；13. exhaust
Mouthful；14. combustion chamber；15. fuel injection device.
Specific embodiment
With reference to the accompanying drawings of the specification, the present invention is further illustrated.
In conjunction with Fig. 1, a kind of two-stroke free-piston electricity generation system, including combustion system, electric system, return mechanism 11 with
And electronic control unit 1, the combustion system include igniter 4, engine cylinder head 5, free-piston 6, air inlet 7, scavenging
Room 8, exhaust outlet 13, fuel injection device 15 and combustion chamber 14, the fuel injection device 15 and igniter 4 are located at the hair
The top of motivation cylinder head 5, the free-piston 6 are located inside engine cylinder head 5, freely live in engine cylinder head 5 positioned at described
The space of 6 top of plug is combustion chamber 14, and the space that 6 lower section of free-piston is located in engine cylinder head 5 is scavenging room 8, into
Port 7 and exhaust outlet 13 are respectively arranged on the side wall of engine cylinder head 5,
The electric system includes coil 9, electric mover 10 and permanent magnet 12, and wherein the coil 9 in electric mover 10 is
Spatial arrangement, electric mover 10 is fixedly connected with the free-piston 6 constitutes piston motion component, and permanent magnet 12 is located at motor
Mover 10 is outer and is located at the inside of coil 9, and the detecting element of piston motion position is provided on piston motion component,
The return mechanism 11 is set to the lower part of free-piston 6.
Further, the return mechanism is mechanical spring 11, and mechanical spring 11 is fixed on linear motor rotor 10 and bottom
Between portion, when 6 downlink of free-piston, mechanical spring 11 is compressed, and plays the role of adjusting the displacement of free-piston 6 and energy storage；
When 6 uplink of free-piston, mechanical spring 11 replys the elastic potential energy of release storage.
Further, the electronic control unit 1 when the engine is working, according to in-engine combustion state to motor
Operating mode be adjusted, control electrical-coil in size of current and direction and oil spout igniting etc. signals, with host computer
Communication is kept, free-piston electricity generation system is debugged and controlled.Power inverter 2 is operable with power generation and electronic two kinds of works
Condition, in size of current and direction determined by controller and motor.Energy storage device 3 be mainly used for store motor institute's generated energy with
And support motor powered mode institute electricity consumption.Electronic control unit 1 by conducting wire respectively with fuel injection device 15, igniter
4 and power inverter 2 be connected.
Further, compression ratio is all variable in the stroke of the free-piston 6, upper and lower reversal point and cylinder.
Further, the linear motor is motive loop permanent magnetic linear electromotor, and motor housing is permanent magnet.
Further, the energy storage device can be battery or supercapacitor, be also possible to combination.
Two-stroke free-piston electricity generation system of the invention, system worked well when power generation mode, generation of burning it is interior
Free-piston moving parts can be pushed to move reciprocatingly, free-piston moving parts cutting magnetic induction line power generation, by power conversion
Device, which will generate electricity, can be stored in energy storage device.When free-piston electricity generation system starts or catches fire, linear motor is converted into electricity
The work of dynamic model formula, energy storage device are powered by power inverter to motor, are controlled by adjusting size and the duration of electric current
The characteristics of motion of piston motion component processed successfully starts up system or operating condition of catching fire is overcome to maintain stable operation.
As shown in Fig. 2, two-stroke free-piston electricity generation system working cycles of the invention, the course of work of system are as follows:
In system starting, to work in motor electronic by the working condition of control power inverter for electronic control unit
Mode, from energy storage device to motor provide electric energy, by control electric current size and Orientation, electric mover with free-piston to
Lower movement, fresh air progress into cylinder, while the mechanical spring of lower section is compressed, and electric energy is stored as elastic potential energy.This
Shi Qidong stroke is completed.
After the completion of starting stroke, system enters two stroke operation circulation, and two stroke operation circulation mainly includes compression stroke
And expansion stroke.When compression stroke starts, under the action of mechanical spring, free-piston is moved upwards, electric mover cutting
Magnetic induction line power generation, electric energy are stored in reversible energy storage device by power inverter.It is gradually closed while piston motion component uplink
Exhaust outlet is closed, the gaseous mixture in cylinder is compressed, when close to compression stroke end, fuel injection device is fired to cylinder injection
Material, igniter light gaseous mixture in compression stroke end.In compression process, electronic control unit according to cylinder pressure signal and
The displacement signal of piston component judges the combustion state of gaseous mixture in cylinder, and when gaseous mixture normal combustion in cylinder, motor is expanding
Stroke will be operate in power generation mode, convert electric energy storage for the energy that burning generates；When detecting in cylinder mixer burning not
Sufficiently or occur catching fire (unburned) when, motor will be operate in electric model in expansion stroke.Below for misfiring cycle and just
The expansion stroke often recycled is introduced respectively.
In misfiring cycle, igniter is lighted in gaseous mixture in compression stroke foot couple cylinder, but due to in-cylinder combustion
The factors such as environment, gaseous mixture may burn insufficient or not lighted in cylinder.Electronic control unit is sentenced according to sensor signal
After disconnected in-cylinder combustion operating condition, electric energy is provided to motor by power sensor, motor is made to work in electric model, band piston group
Part moves downward, this process is gradually opened air inlet and exhaust outlet, completes ventilation in cylinder, while compressing mechanical spring downwards, when
When piston reaches lower reversal point, expansion stroke terminates, and subsequent spring pushes the power generation of piston component uplink, into compression stroke.
In normal circulation, igniter is lighted in gaseous mixture in compression stroke foot couple cylinder, and gaseous mixture is ignited, and is released
The energy put pushes piston component downlink, the power generation of electric mover cutting magnetic induction line.Electronic control unit passes through control power conversion
Device makes linear motor work in power generation mode, and generating electricity can be by deposit reversible device.Piston downlink process be gradually opened into
Port and exhaust outlet complete ventilation in cylinder, and compressed spring, and when piston reaches lower reversal point, expansion stroke terminates, subsequent bullet
Spring pushes the power generation of piston component uplink, into compression stroke.
Basic principles and main features and advantage of the invention have been shown and described above.The technical staff of the industry should
Understand, the present invention is not limited to the above embodiments, and the above embodiments and description only describe originals of the invention
Reason, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes and improvements
It all fall within the protetion scope of the claimed invention.The claimed scope of the invention is by appended claims and its equivalent circle
It is fixed.
Claims (7)
1. a kind of two-stroke free-piston electricity generation system, which is characterized in that including combustion system, electric system, return mechanism
(11) and electronic control unit (1), the combustion system include igniter (4), engine cylinder head (5), free-piston
(6), air inlet (7), scavenging room (8), exhaust outlet (13), fuel injection device (15) and combustion chamber (14), the fuel injection
Device (15) and igniter (4) are located at the top of the engine cylinder head (5), and the free-piston (6) is located at engine cylinder
Head (5) is internal, and the space in engine cylinder head (5) above the free-piston (6) is combustion chamber (14), engine cylinder head
(5) space in below the free-piston (6) is scavenging room (8), and air inlet (7) and exhaust outlet (13) are respectively arranged at
On the side wall of engine cylinder head (5),
The electric system includes coil (9), electric mover (10) and permanent magnet (12), wherein the coil in electric mover (10)
It (9) is spatial arrangement, electric mover (10) is fixedly connected with the free-piston (6) constitutes piston motion component, permanent magnet
(12) it is located at electric mover (10) outside and is located at the inside of coil (9), piston motion position is provided on piston motion component
Detecting element,
The return mechanism (11) is set to the lower part of free-piston (6).
2. two-stroke free-piston electricity generation system according to claim 1, which is characterized in that the electricity generation system further includes
Power inverter (2) and energy storage device (3), the electronic control unit (1) by conducting wire respectively with fuel injection device (15),
Igniter (4) and power inverter (2) are connected, and power inverter (2) is connected with energy storage device (3).
3. two-stroke free-piston electricity generation system according to claim 2, which is characterized in that set in the combustion chamber (14)
It is equipped with pressure sensor, displacement sensor, the pressure sensor and displacement sensor point are provided on the free-piston (6)
It is not connect with electronic control unit (1).
4. two-stroke free-piston electricity generation system according to claim 3, which is characterized in that the coil (9) respectively with
Electronic control unit (1) and power inverter (2) connection.
5. two-stroke free-piston electricity generation system according to claim 4, which is characterized in that the return mechanism (11) is
Mechanical spring or gas spring or hydraulic return mechanism.
6. two-stroke free-piston electricity generation system according to claim 4, which is characterized in that the energy storage device (3) is
Battery or supercapacitor or combination.
7. according to the electricity-generating method of the described in any item two-stroke free-piston electricity generation systems of claim 4-6, which is characterized in that
The following steps are included:
Step 1: in system starting, electronic control unit (1) makes motor by controlling the working condition of power inverter (2)
System works in electric model, provides electric energy from energy storage device (3) to electric system, by controlling the size and Orientation of electric current,
Electric mover (10) is moved downward with free-piston (6), and fresh air is gradually entered in cylinder by air inlet (7), while lower section
Return mechanism (11) compressed, electric energy is stored as elastic potential energy；
Step 2: starting stroke after the completion of, system enter two stroke operation circulation, two stroke operation circulation include compression stroke and
Expansion stroke, when compression stroke starts, under the action of return mechanism (11), free-piston (6) is moved upwards, electric mover
(10) cutting magnetic induction line generates electricity, and electric energy is stored in energy storage device (3) by power inverter (2), piston motion component uplink
Exhaust outlet (13) are progressively closed off simultaneously, the gaseous mixture in cylinder is compressed, when close to compression stroke end, fuel injection device
(15) to cylinder injection fuel, igniter (4) lights gaseous mixture in compression stroke end, and in compression process, electronic control is single
First (1) judges the combustion state of gaseous mixture in cylinder according to the displacement signal of cylinder pressure signal and piston motion component, when in cylinder
When gaseous mixture normal combustion, electric system will be operate in power generation mode in expansion stroke, convert electricity for the energy that burning generates
It can store, when detecting that mixer burning is insufficient in cylinder or catches fire, electric system will be operate in electricity in expansion stroke
Dynamic model formula；
Step 3: when electric system is when expansion stroke works in electric model, igniter (4) is in compression stroke foot couple cylinder
Gaseous mixture is lighted, and mixture combustion is insufficient in cylinder or is not lighted, and electronic control unit (1) is according to pressure sensor
After signal judges in-cylinder combustion operating condition, electric energy is provided to electric system by power sensor (2), electric system is made to work in electricity
Dynamic model formula drives piston motion component to move downward, this process is gradually opened exhaust outlet (13) and air inlet (7), completes in cylinder
Ventilation, while compression and back apparatus for coating (11) downwards, when free-piston (6) reach lower reversal point, expansion stroke terminates, and then returns
Apparatus for coating (11) pushes the power generation of piston motion component uplink, into compression stroke；
When electric system is when expansion stroke works in power generation mode, igniter (4) is in gaseous mixture in compression stroke foot couple cylinder
It is lighted, gaseous mixture is ignited, and the energy of release pushes piston motion component downlink, electric mover (10) cutting magnetic induction line hair
Electricity, electronic control unit (1) make electric system work in power generation mode by controlling power inverter (2), and generating electricity can pass through
Power inverter (2) is stored in energy storage device (3), and piston motion component downlink process is gradually opened exhaust outlet (13) and air inlet
(7), ventilation in cylinder is completed, while compression and back apparatus for coating (11) downwards, when free-piston (6) reach lower reversal point, expansion punching
Journey terminates, and subsequent return mechanism (11) pushes the power generation of piston motion component uplink, into compression stroke.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910070828.7A CN109653869B (en) | 2019-01-25 | 2019-01-25 | Two-stroke free piston power generation system and power generation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910070828.7A CN109653869B (en) | 2019-01-25 | 2019-01-25 | Two-stroke free piston power generation system and power generation method thereof |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110486157A (en) * | 2019-09-20 | 2019-11-22 | 赵银生 | The internal combustion engine generator replied based on gravitional force |
| CN111997693A (en) * | 2020-08-28 | 2020-11-27 | 东风汽车集团有限公司 | Compressed air power generator |
| CN112879154A (en) * | 2021-01-12 | 2021-06-01 | 重庆科技学院 | Single-acting hydraulic type internal combustion engine linear power generation device |
| CN113047953A (en) * | 2021-03-12 | 2021-06-29 | 哈尔滨工程大学 | Single-piston type internal combustion linear generator with two-stage compression expansion cycle |
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| CN111997693A (en) * | 2020-08-28 | 2020-11-27 | 东风汽车集团有限公司 | Compressed air power generator |
| CN112879154A (en) * | 2021-01-12 | 2021-06-01 | 重庆科技学院 | Single-acting hydraulic type internal combustion engine linear power generation device |
| CN112879154B (en) * | 2021-01-12 | 2022-05-17 | 重庆科技学院 | Single-acting hydraulic type internal combustion engine linear power generation device |
| CN113047953A (en) * | 2021-03-12 | 2021-06-29 | 哈尔滨工程大学 | Single-piston type internal combustion linear generator with two-stage compression expansion cycle |
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