CN104806354B - The adjustable free-piston internal combustion power generation power system of compression ratio - Google Patents
The adjustable free-piston internal combustion power generation power system of compression ratio Download PDFInfo
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- CN104806354B CN104806354B CN201510224810.XA CN201510224810A CN104806354B CN 104806354 B CN104806354 B CN 104806354B CN 201510224810 A CN201510224810 A CN 201510224810A CN 104806354 B CN104806354 B CN 104806354B
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 28
- 238000010248 power generation Methods 0.000 title claims abstract description 18
- 238000006073 displacement reaction Methods 0.000 claims abstract description 15
- 230000009123 feedback regulation Effects 0.000 claims abstract description 14
- 230000008859 change Effects 0.000 claims abstract description 6
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- 238000005538 encapsulation Methods 0.000 abstract 1
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- 238000006243 chemical reaction Methods 0.000 description 4
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- 238000011217 control strategy Methods 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
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Abstract
The present invention relates to a kind of adjustable free-piston internal combustion power generation power system of compression ratio, belong to field of power machinery technology.The present invention controls the position of mover midstroke using position adjustments case, and the compression ratio of both sides cylinder is adjusted with this.Control signal is made through ECU processing with the displacement data that displacement transducer gathers, realizes the closed feedback regulation of whole system.The design can change start position in engine start operating mode by adjusting locating rod position.In system stable operation operating mode, position adjustments case is controlled by ECU output signals, and position knots modification is determined by both sides cylinder compression ratio.Because locating rod and mover connecting rod connect firmly, its left and right sides encapsulation compressive state spring, in the presence of two lateral springs and rack-and-pinion stress, realize system compresses than adjustment.
Description
Technical field
The present invention relates to a kind of adjustable free-piston internal combustion power generation power system of compression ratio, belongs to dynamic power machine technology neck
Domain.
Background technology
Free-piston internal combustion power generation power system (Free Piston Engine Generator, hereinafter referred to as FPEG),
It is under the serious overall background of energy scarcity and environmental pollution, in the Novel power system that last decade gradually grows up.It will
Free-piston type internal-combustion engine and linear electric generator are coupled as body, it is intended to provide clean energy resource for hybrid vehicle.Compared to biography
The assembly power of system crank type internal combustion engine and rotary generator, free-piston internal combustion power generation power system have cast out crank connecting link machine
Structure, there is simple, the high energy conversion efficiency of mechanism, multi fuel adaptability, high energy density, relatively low NVH, higher transient state
The numerous performance advantages of reaction water equality, are paid attention to by domestic and international related researcher.Compression-ignited free-piston engine has
Compression ratio is high, the innate advantage of output power, turns into one of emphasis of current free-piston area research.
It is left because no toggle restricts the dead-centre position up and down of piston for free-piston internal combustion engine generator
Compression ratio in right two cylinders is variable.Variable compression ratio can cause free-piston internal combustion engine generator to adapt to a greater variety of combustions
Material, has higher energy conversion efficiency, but the Combustion Cycle Variability caused by compression ratio is uncontrollable can be largely
The stable operation situation of upper influence system, turn into the difficult point of control system research and development.
The content of the invention
The invention aims to solve free-piston internal combustion engine generator alterable compression ratio in the prior art but uncontrollable,
The problem of causing running situation unstable.Propose a kind of adjustable free-piston internal combustion power generation power system of compression ratio.
The purpose of the present invention is achieved through the following technical solutions.
The adjustable free-piston internal combustion power generation power system of compression ratio, including connecting rod, position-limit mechanism, rack, gear, driving
Motor, control system ECU；
Position-limit mechanism includes：Position adjustments case, locating rod, spring；
The spring can also be replaced by hydraulic damper；
Position-limit mechanism is placed between cylinder and motor；Connecting rod through position adjustments case respectively with both sides piston, motor
Son is fixedly connected；Locating rod is fixed on connecting rod, and position adjustments case middle is located under system-down state；Spring is nested in company
On bar, locating rod both sides are symmetrically arranged on；Rack is disposed with the outside of position adjustments case；Position adjustments case has side and the tooth of rack
Wheel connection；Gear is connected with motor；The controlled system ECU controls of motor；Control system ECU connects with motor driver
Connect, receive mover displacement information as control input amount.
The course of work：
Under system-down state, locating rod is acted on the middle for being in position adjustments case all the time by spring, and position is adjusted
Section case moves left and right can be so that the decrement of its contained spring be changed, and the stress balance at left and right sides of locating rod is beaten
It is broken.Under the action of the spring, locating rod and corresponding displacement can be also moved with the connecting rod that it is connected firmly, it is living in two cylinders of left and right so as to change
The position of plug.
System respectively completes burning of being once under fire under generating operation mode, in engine left and right cylinder, and electric mover and connecting rod return
Postponed again to start bit, assert that a working cycles are completed.Displacement transducer built in linear electric motors is by detect work
Make circulation inside connecting rod run-length data be transferred in control system ECU, according to set before length of connecting rod, both sides cylinder head bottom
Data, the control system ECU such as end distance, startup position will calculate compression ratio of the piston in the cylinder of both sides, and use left side gas
Cylinder compression ratio subtracts right side compression ratio.Assert that left side compression is bigger if difference is cannoncial system, control system ECU is sent accordingly
Direct impulse, pulsewidth is directly proportional to absolute difference size, control motor rotate clockwise, to drive position adjustments case
Move right.If difference is bigger for the compression of negative explanation right side, control system ECU sends corresponding negative-going pulse, and pulsewidth is same
Directly proportional to the absolute value of difference, now position adjustments case can be moved to the left accordingly.After completing a feedback regulation, system exists
Subsequent cycle restarts record position data, and new control strategy is made after a circulation.By the regulation and control of several circulations
Afterwards, the compression ratio of both sides gradually reaches unanimity.
Freely adjusting for both sides compression ratio can be realized by the setting to control system ECU.Control thinking as follows：Motor
After one circulation of operation, control system ECU calculates the compression ratio of two cylinders, and setting left end compression ratio is bigger a than right-hand member, if then
Left end compression ratio subtracts right-hand member compression ratio absolute value and is more than a, sends instruction control position regulating box and moves right.Conversely, then to
Move left.Complete after once regulating and controlling, start the feedback regulation of a new round in subsequent cycle, until both sides compression ratio reaches setting
Value.
Spring can be encapsulated in position adjustments case can also encapsulate damper, and both principles are all by adjustment bar two
The stress of side moves it.When encapsulating spring, the sensitivity of feedback regulation is higher, and spring can do energy storage member when mover moves
Part, it is smaller to the obstruction of mover motion, but shortcoming is that piston movement is made to upper and lower stop spring to the position regulating box left and right sides
It is firmly larger.When encapsulating damper, feedback regulation sensitivity is relatively low, and mover motion needs to overcome larger resistance, and drag size
Influenceed by speed, but advantage is that shock loading is less suffered by system, and position adjustments case both sides are smaller by active force, and lifetime of system is more
It is long.
Beneficial effect
1st, the adjustable free-piston internal combustion power generation power system of compression ratio of the invention, mover is controlled using position adjustments case
The position of midstroke, the compression ratio of both sides cylinder is adjusted with this.With the displacement data of motor driver input through ECU processing
As control signal, the closed feedback regulation of whole system is realized.
2nd, the adjustable free-piston internal combustion power generation power system of compression ratio of the invention, maximum feature is to realize free work
The compression ratio of plug internal combustion power generation power system is adjusted on demand.This had both remained that free-piston engine power density is high, a variety of combustions
Expect the characteristics of adaptability is good, energy conversion efficiency is high, also achieve system compresses ratio and change with operating mode and adjust in real time, improve
Combustion instability, to realize that the variable working condition self-control of free-piston internal combustion electricity generation system is laid a good foundation.
Brief description of the drawings
Fig. 1 is that spring regulates and controls compression ratio formula free-piston internal combustion power generation power system；
Fig. 2 is damping regulation and control compression ratio formula free-piston internal combustion power generation power system.
Wherein, 1-connecting rod, 2-position adjustments case, 3-locating rod, 4-spring, 5-rack, 6-gear, 7- driving electricity
Machine, 8-control system ECU, 9-hydraulic damper.
Embodiment
In order to better illustrate objects and advantages of the present invention, the content of the invention is made with reference to the accompanying drawings and examples into one
Walk explanation.
Embodiment 1
The adjustable free-piston internal combustion power generation power system of compression ratio, including connecting rod 1, position-limit mechanism, rack 5, gear 6,
Motor 7, control system ECU8, as shown in Figure 1；
Position-limit mechanism includes：Position adjustments case 2, locating rod 3, spring 4；
Position-limit mechanism is placed between cylinder and motor；Connecting rod 1 through position adjustments case 2 respectively with both sides piston, motor
Mover is fixedly connected；Locating rod 3 is fixed on connecting rod 1, and the middle of position adjustments case 2 is located under system-down state；Spring 4 is embedding
It is enclosed on connecting rod 1, is symmetrically arranged on the both sides of locating rod 3；The outside of position adjustments case 2 is disposed with rack 5；Position adjustments case 2 is with teeth
The side of bar 5 is connected with gear 6；Gear 6 is connected with motor 7；The controlled system ECU8 controls of motor 7；Control system
System ECU8 is connected with motor driver, receives mover displacement information as control input amount.
The course of work：
Under system-down state, locating rod 3 is acted on the middle for being in position adjustments case 2 all the time, position by spring
Regulating box 2 moves left and right can be so that the decrement of its contained spring 4 be changed, and the stress of the left and right sides of locating rod 3 is put down
Weighing apparatus is broken.Under the action of the spring, locating rod 3 and corresponding displacement can be also moved with the connecting rod 1 that it is connected firmly, so as to change left and right
The position of two cylinder inner carriers.
System respectively completes burning of being once under fire under generating operation mode, in engine left and right cylinder, and electric mover and connecting rod 1 return
Postponed again to start bit, assert that a working cycles are completed.Displacement transducer built in linear electric motors is by detect work
Make circulation inside connecting rod 1 run-length data be transferred in control system ECU8, according to set before length of connecting rod, both sides cylinder head
Data, the control system ECU8 such as bottom distance, startup position will calculate compression ratio of the piston in the cylinder of both sides, and use left side
Cylinder compression ratio subtracts right side compression ratio.Assert that left side compression is bigger if difference is cannoncial system, control system ECU8 is sent
Corresponding direct impulse, pulsewidth is directly proportional to absolute difference size, and control motor 7 rotates clockwise, to drive position
Regulating box 3 moves right.If difference is bigger for the compression of negative explanation right side, control system ECU8 sends corresponding negative-going pulse,
Pulsewidth is equally directly proportional to the absolute value of difference, and now position adjustments case 3 can be moved to the left accordingly.Complete a feedback regulation
Afterwards, system restarts record position data in subsequent cycle, and new control strategy is made after a circulation.Followed by several
After the regulation and control of ring, the compression ratio of both sides gradually reaches unanimity.
Freely adjusting for both sides compression ratio can be realized by the setting to control system ECU8.Control thinking as follows：Electricity
After machine runs a circulation, control system ECU8 calculates the compression ratio of two cylinders, and setting left end compression ratio is bigger a than right-hand member,
If then left end compression ratio subtracts right-hand member compression ratio absolute value and is more than a, send instruction control position regulating box 3 and move right.Conversely,
Then it is moved to the left.Complete after once regulating and controlling, start the feedback regulation of a new round in subsequent cycle, until both sides compression ratio reaches and set
Definite value.
When encapsulating spring, the sensitivity of feedback regulation is higher, and spring can do energy-storage travelling wave tube when mover moves, and mover is transported
Dynamic obstruction is smaller, but shortcoming is that piston movement is larger to active force at left and right sides of the regulating box of position to upper and lower stop spring.
Embodiment 2
The adjustable free-piston internal combustion power generation power system of compression ratio, including connecting rod 1, position-limit mechanism, rack 5, gear 6,
Motor 7, control system ECU8, as shown in Figure 2；
Position-limit mechanism includes：Position adjustments case 2, locating rod 3, hydraulic damper 9；
Position-limit mechanism is placed between cylinder and motor；Connecting rod 1 through position adjustments case 2 respectively with both sides piston, motor
Mover is fixedly connected；Locating rod 3 is fixed on connecting rod 1, and the middle of position adjustments case 2 is located under system-down state；Hydraulic pressure hinders
Buddhist nun's device 9 is nested on connecting rod 1, is symmetrically arranged on the both sides of locating rod 3；The outside of position adjustments case 2 is disposed with rack 5；Position adjustments
The side that case 2 has rack 5 is connected with gear 6；Gear 6 is connected with motor 7；The controlled system ECU8 controls of motor 7；
Control system ECU8 is connected with motor driver, receives mover displacement information as control input amount.
The course of work：
Under system-down state, middle of the effect in position adjustments case 2 of 3 device dampened of locating rod, position is adjusted
Section case 2 move left and right can so that the decrement of its internal hydraulic pressure damper 9 changes, at left and right sides of locating rod 3 by
Dynamic balance is broken.Under the effect of hydraulic damper 9, locating rod 3 and corresponding displacement can be also moved with the connecting rod 1 that it is connected firmly,
So as to change the position of two cylinder inner carriers of left and right.
System respectively completes burning of being once under fire under generating operation mode, in engine left and right cylinder, and electric mover and connecting rod 1 return
Postponed again to start bit, assert that a working cycles are completed.Displacement transducer built in linear electric motors is by detect work
Make circulation inside connecting rod 1 run-length data be transferred in control system ECU8, according to set before length of connecting rod, both sides cylinder head
Data, the control system ECU8 such as bottom distance, startup position will calculate compression ratio of the piston in the cylinder of both sides, and use left side
Cylinder compression ratio subtracts right side compression ratio.Assert that left side compression is bigger if difference is cannoncial system, control system ECU8 is sent
Corresponding direct impulse, pulsewidth is directly proportional to absolute difference size, and control motor 7 rotates clockwise, to drive position
Regulating box 3 moves right.If difference is bigger for the compression of negative explanation right side, control system ECU8 sends corresponding negative-going pulse,
Pulsewidth is equally directly proportional to the absolute value of difference, and now position adjustments case 3 can be moved to the left accordingly.Complete a feedback regulation
Afterwards, system restarts record position data in subsequent cycle, and new control strategy is made after a circulation.Followed by several
After the regulation and control of ring, the compression ratio of both sides gradually reaches unanimity.
Freely adjusting for both sides compression ratio can be realized by the setting to control system ECU8.Control thinking as follows：Electricity
After machine runs a circulation, control system ECU8 calculates the compression ratio of two cylinders, and setting left end compression ratio is bigger a than right-hand member,
If then left end compression ratio subtracts right-hand member compression ratio absolute value and is more than a, send instruction control position regulating box 3 and move right.Conversely,
Then it is moved to the left.Complete after once regulating and controlling, start the feedback regulation of a new round in subsequent cycle, until both sides compression ratio reaches and set
Definite value.
When encapsulating damper, feedback regulation sensitivity is relatively low, and mover motion needs to overcome larger resistance, and drag size by
Speed influences, but advantage is that shock loading is less suffered by system, and position adjustments case both sides are smaller by active force, and lifetime of system is more
It is long.
Above example is only the specific embodiment of the present invention, is not intended to limit the protection model of the present invention
Enclose.Within the spirit and principles of the invention, any modification, equivalent substitution and improvements made etc., should be included in the present invention
Protection domain within.
Claims (3)
1. the adjustable free-piston internal combustion power generation power system of compression ratio, it is characterised in that：Including connecting rod (1), position-limit mechanism, tooth
Bar (5), gear (6), motor (7), control system ECU (8)；Position-limit mechanism includes：Position adjustments case (2), locating rod
(3), spring (4)；
Position-limit mechanism is placed between cylinder and motor；Connecting rod (1) through position adjustments case (2) respectively with both sides piston, motor
Mover is fixedly connected；Locating rod (3) is fixed on connecting rod (1), and position adjustments case (2) middle is located under system-down state；
Spring (4) is nested on connecting rod (1), is symmetrically arranged on locating rod (3) both sides；Rack is disposed with the outside of position adjustments case (2)
(5)；The side that position adjustments case (2) has rack (5) is connected with gear (6)；Gear (6) is connected with motor (7)；Driving electricity
Controlled system ECU (8) control of machine (7)；Control system ECU (8) is connected with motor driver, receives mover displacement information conduct
Control input amount.
2. the adjustable free-piston internal combustion power generation power system of compression ratio as claimed in claim 1, it is characterised in that：The bullet
Spring (4) can also be substituted by hydraulic damper (9).
3. the adjustable free-piston internal combustion power generation power system of compression ratio as claimed in claim 1, it is characterised in that：It is worked
Journey is as follows：
Under system-down state, locating rod (3) is in the middle of position adjustments case (2), position by the effect of spring all the time
Regulating box (2) moves left and right can be so that the decrement of its contained spring (4) changes, at left and right sides of locating rod (3)
Stress balance is broken；Under the action of the spring, locating rod (3) and corresponding displacement can be also moved with the connecting rod (1) that it is connected firmly, from
And change the position of two cylinder inner carriers of left and right；
System respectively completes burning of being once under fire under generating operation mode, in engine left and right cylinder, and electric mover and connecting rod (1) are replied
Postponed to start bit, assert that a working cycles are completed；Displacement transducer built in linear electric motors works detect one
The run-length data of circulation inside connecting rod (1) is transferred in control system ECU (8), according to length of connecting rod, the both sides cylinder set before
Data, the control system ECU (8) such as base end distance, startup position will calculate compression ratio of the piston in the cylinder of both sides, be used in combination
Left hand cylinder compression ratio subtracts right side compression ratio；If difference, which is cannoncial system, assert that bigger, control system ECU is compressed in left side
(8) corresponding direct impulse is sent, pulsewidth is directly proportional to absolute difference size, and control motor (7) rotates clockwise, with
Position adjustments case (2) is driven to move right；If difference is bigger for the compression of negative explanation right side, control system ECU (8) is sent accordingly
Negative-going pulse, pulsewidth is equally directly proportional to the absolute value of difference, and now position adjustments case (2) can be moved to the left accordingly；It is complete
Into after a feedback regulation, system restarts record position data in subsequent cycle, and new control is made after a circulation
Strategy；After regulation and control by several circulations, the compression ratio of both sides gradually reaches unanimity；
Freely adjusting for both sides compression ratio is realized by the setting to control system ECU (8)；Control thinking as follows：Motor operation
After one circulation, control system ECU (8) calculates the compression ratio of two cylinders, and setting left end compression ratio is bigger a than right-hand member, if then
Left end compression ratio subtracts right-hand member compression ratio absolute value and is more than a, sends instruction control position regulating box (2) and moves right；Conversely, then
It is moved to the left；Complete after once regulating and controlling, start the feedback regulation of a new round in subsequent cycle, until both sides compression ratio reaches setting
Value.
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| CN201510224810.XA CN104806354B (en) | 2015-05-05 | 2015-05-05 | The adjustable free-piston internal combustion power generation power system of compression ratio |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN106014628A (en) * | 2016-07-12 | 2016-10-12 | 魏伯卿 | Gear control telescopic worm wheel boost adjusting device of radial movement variable-cylinder engine |
| CN106285994B (en) * | 2016-08-19 | 2019-08-02 | 新奥（中国）燃气投资有限公司 | A kind of free-piston type internal-combustion engine and internal combustion engine generator |
| DE102017107706A1 (en) * | 2017-04-10 | 2018-10-11 | Avl List Gmbh | Length-adjustable connecting rod with a cylinder-piston unit with anti-rotation |
| CN108412611A (en) * | 2018-04-04 | 2018-08-17 | 吉林大学 | A kind of built-in motor drive-type variable length link |
| CN108979872A (en) * | 2018-09-20 | 2018-12-11 | 吉林大学 | A kind of magnetic resistance type position feedback type compression ratio controllable piston |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201288608Y (en) * | 2008-11-21 | 2009-08-12 | 靳北彪 | Free piston type load response engine |
| CN102877941A (en) * | 2012-10-15 | 2013-01-16 | 北京理工大学 | Starting system of high-pressure air source type free piston internal combustion generator |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103498733B (en) * | 2013-09-29 | 2016-04-06 | 北京理工大学 | A kind of motion control method of free-piston internal combustion engine generator |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201288608Y (en) * | 2008-11-21 | 2009-08-12 | 靳北彪 | Free piston type load response engine |
| CN102877941A (en) * | 2012-10-15 | 2013-01-16 | 北京理工大学 | Starting system of high-pressure air source type free piston internal combustion generator |
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