CN104806354A - Free piston internal combustion generation power system with adjustable compression ratio - Google Patents
Free piston internal combustion generation power system with adjustable compression ratio Download PDFInfo
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- CN104806354A CN104806354A CN201510224810.XA CN201510224810A CN104806354A CN 104806354 A CN104806354 A CN 104806354A CN 201510224810 A CN201510224810 A CN 201510224810A CN 104806354 A CN104806354 A CN 104806354A
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- 230000006835 compression Effects 0.000 title claims abstract description 74
- 238000007906 compression Methods 0.000 title claims abstract description 74
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 26
- 230000033228 biological regulation Effects 0.000 claims abstract description 52
- 238000006073 displacement reaction Methods 0.000 claims abstract description 15
- 230000009123 feedback regulation Effects 0.000 claims abstract description 13
- 230000001105 regulatory effect Effects 0.000 claims abstract description 8
- 238000010248 power generation Methods 0.000 claims description 17
- 230000007246 mechanism Effects 0.000 claims description 13
- 238000000034 method Methods 0.000 claims description 6
- 230000008859 change Effects 0.000 claims description 5
- 239000000969 carrier Substances 0.000 claims description 4
- 238000011217 control strategy Methods 0.000 claims description 4
- 230000000694 effects Effects 0.000 claims description 4
- 230000009471 action Effects 0.000 claims description 3
- 230000008901 benefit Effects 0.000 description 5
- 238000005538 encapsulation Methods 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 4
- 230000035945 sensitivity Effects 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000446 fuel Substances 0.000 description 3
- 238000004146 energy storage Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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- 230000001052 transient effect Effects 0.000 description 1
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Abstract
The invention relates to a free piston internal combustion generation power system with an adjustable compression ratio, and belongs to the technical field of power machinery. A position regulating box is adopted to control the position of a rotor stroke middle point, so as to adjust the compression ratio of cylinders at the two sides. Displacement data collected by a displacement sensor are processed by an ECU (Electronic Control Unit) to be control signals, so that the closed feedback regulation of the whole system can be realized. Under an engine starting working condition, the position of a starting point can be changed by adjusting the position of a locating rod; under a system steady running working condition, the position regulating box is controlled by an ECU output signal, and the position variation is determined by the compression ratio of the cylinders at the two sides. Since the locating rod is fixedly connected with a rotor connecting rod, so that the locating rod seals springs under a state of compression at the right and left sides; under the functions of the springs at the two sides and the stress of a gear rack, the regulation of the system compression ratio is realized.
Description
Technical field
The present invention relates to the free-piston internal combustion power generation power system that a kind of compression ratio is adjustable, belong to field of power machinery technology.
Background technique
Free-piston internal combustion power generation power system (Free Piston Engine Generator, hereinafter referred to as FPEG) is under energy scarcity and the serious overall background of environmental pollution, at the Novel power system that nearly ten years grow up gradually.Free-piston type internal-combustion engine and linear electric generator are coupled as body by it, are intended to for hybrid vehicle provides clean energy resource.Compared to the assembly power of conventional crankshafts formula internal-combustion engine and rotary generator, free-piston internal combustion power generation power system has cast out connecting rod, there is numerous performance advantages such as simple, the high energy conversion efficiency of mechanism, multi fuel adaptability, high energy density, lower NVH, higher Transient response level, be subject to the attention of domestic and international related researcher.It is high that compression-ignited free-piston engine has compression ratio, the innate advantage that output power is large, becomes one of emphasis of current free-piston area research.
For free-piston internal combustion engine generator, due to the dead-centre position up and down not having connecting rod to restrict piston, the compression ratio in the cylinder of left and right two is variable.Variable compression ratio can make free-piston internal combustion engine generator adapt to a greater variety of fuel, there is higher energy conversion efficiency, but because uncontrollable the caused Combustion Cycle Variability of compression ratio can the stable operation situation of influential system to a great extent, become the difficult point of control system research and development.
Summary of the invention
The object of the invention is, in order to solve free-piston internal combustion engine generator alterable compression ratio in prior art but uncontrollable, to cause the problem of running situation instability.Propose the free-piston internal combustion power generation power system that a kind of compression ratio is adjustable.
The object of the invention is to be achieved through the following technical solutions.
The free-piston internal combustion power generation power system that compression ratio is adjustable, comprises connecting rod, position-limit mechanism, tooth bar, gear, drive motor, control system ECU;
Position-limit mechanism comprises: position regulation case, positioning rod, spring;
Described spring can also be replaced by hydraulic damper;
Position-limit mechanism is placed between cylinder and motor; Connecting rod is fixedly connected with both sides piston, electric mover respectively through position regulation case; Positioning rod is fixed on connecting rod, is positioned at position regulation case middle under system-down state; Spring is nested on connecting rod, and symmetry is installed on positioning rod both sides; Tooth bar is furnished with outside position regulation case; Position regulation case has the side of tooth bar to be connected with gear; Gear is connected with drive motor; The controlled system ECU of drive motor controls; Control system ECU is connected with motor driver, receives mover displacement information as control inputs amount.
Working procedure:
Under system-down state, positioning rod is subject to the effect of spring to be in the middle of position regulation case all the time, and position regulation case moves left and right and the decrement of its contained spring can be made to change, and the stress balance of the positioning rod left and right sides is broken.Under the action of the spring, positioning rod and also can move corresponding displacement to the connecting rod that it connects firmly, thus the position changing left and right two cylinder inner carriers.
System, under generating operation mode, respectively completes at motor left and right cylinder and once gets angry burning, after electric mover and connecting rod are returned to enable position, assert that a work cycle completes.The run-length data of detect work cycle inside connecting rod is transferred in control system ECU by the built-in displacement transducer of linear electric motor, according to data such as the length of connecting rod arranged before, cylinder head bottom, both sides distance, enable positions, control system ECU will calculate the compression ratio of piston in the cylinder of both sides, and deducts right side compression ratio with left hand cylinder compression ratio.Assert that left side compression ratio is comparatively large if difference is canonical system, control system ECU sends corresponding direct impulse, and pulsewidth is directly proportional to absolute difference size, controls drive motor and rotates clockwise, move right to drive position regulation case.If for negative, difference illustrates that right side compression ratio is comparatively large, control system ECU sends corresponding negative-going pulse, and pulsewidth is directly proportional to the absolute value of difference equally, and now position regulation case can be moved to the left accordingly.After completing a feedback regulation, system restarts record position data in next circulation, the control strategy doing to make new advances after a circulation.After the regulation and control of several circulation, the compression ratio of both sides reaches unanimity gradually.
Can by arranging to control system ECU the free adjustment realizing both sides compression ratio.Control thinking is as follows: after motor runs a circulation, control system ECU calculates the compression ratio of two cylinders, setting left end compression ratio a larger than right-hand member, if then left end compression ratio deducts right-hand member compression ratio absolute value and is greater than a, sends instruction control position regulating box and moves right.Otherwise, be then moved to the left.After completing once regulation and control, start the feedback regulation of a new round in next circulation, until both sides compression ratio reaches setting value.
Can encapsulate spring in position regulation case and also can encapsulate damper, both principles are all stressed the moving it by adjustment bar both sides.During encapsulation spring, the sensitivity of feedback regulation is higher, and spring can do energy-storage travelling wave tube when mover move, and the obstruction of moving to mover is less, but shortcoming is piston movement, and to arrive upper and lower stop spring larger to the regulating box left and right sides, position active force.During encapsulation damper, feedback regulation sensitivity is lower, and mover motion needs overcome larger resistance, and drag size is by rate, but advantage is that suffered by system, impulsive load is less, and position regulation case both sides are less by active force, and lifetime of system is longer.
Beneficial effect
1, the free-piston internal combustion power generation power system that compression ratio of the present invention is adjustable, adopts position regulation case to control the position of mover midstroke, regulates the compression ratio of both sides cylinder with this.Using motor driver input displacement data through ECU process as control signal, realize whole system closed feedback adjustment.
2, the free-piston internal combustion power generation power system that compression ratio of the present invention is adjustable, maximum feature is that the compression ratio achieving free-piston internal combustion power generation power system regulates as required.This had both remained the feature that free-piston engine specific power is high, pluralities of fuel adaptability is good, energy conversion efficiency is high, also achieve system compresses to regulate in real time than changing with operating mode, improve combustion instability, for the variable working condition self-control realizing free-piston internal combustion power generation system is laid a good foundation.
Accompanying drawing explanation
Fig. 1 is spring regulation and control 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 regulation case, 3-positioning rod, 4-spring, 5-tooth bar, 6-gear, 7-drive motor, 8-control system ECU, 9-hydraulic damper.
Embodiment
In order to better objects and advantages of the present invention are described, below in conjunction with drawings and Examples, summary of the invention is described further.
Embodiment 1
The free-piston internal combustion power generation power system that compression ratio is adjustable, comprises connecting rod 1, position-limit mechanism, tooth bar 5, gear 6, drive motor 7, control system ECU8, as shown in Figure 1;
Position-limit mechanism comprises: position regulation case 2, positioning rod 3, spring 4;
Position-limit mechanism is placed between cylinder and motor; Connecting rod 1 is fixedly connected with both sides piston, electric mover respectively through position regulation case 2; Positioning rod 3 is fixed on connecting rod 1, is positioned at position regulation case 2 middle under system-down state; Spring 4 is nested on connecting rod 1, and symmetry is installed on positioning rod 3 both sides; Tooth bar 5 is furnished with outside position regulation case 2; Position regulation case 2 has the side of tooth bar 5 to be connected with gear 6; Gear 6 is connected with drive motor 7; The controlled system ECU8 of drive motor 7 controls; Control system ECU8 is connected with motor driver, receives mover displacement information as control inputs amount.
Working procedure:
Under system-down state, positioning rod 3 is subject to the effect of spring to be in the middle of position regulation case 2 all the time, and position regulation case 2 moves left and right and the decrement of its contained spring 4 can be made to change, and the stress balance of positioning rod 3 left and right sides is broken.Under the action of the spring, positioning rod 3 and also can move corresponding displacement to the connecting rod 1 that it connects firmly, thus the position changing left and right two cylinder inner carriers.
System, under generating operation mode, respectively completes at motor left and right cylinder and once gets angry burning, after electric mover and connecting rod 1 are returned to enable position, assert that a work cycle completes.The run-length data of detect work cycle inside connecting rod 1 is transferred in control system ECU8 by the built-in displacement transducer of linear electric motor, according to data such as the length of connecting rod arranged before, cylinder head bottom, both sides distance, enable positions, control system ECU8 will calculate the compression ratio of piston in the cylinder of both sides, and deducts right side compression ratio with left hand cylinder compression ratio.Assert that left side compression ratio is comparatively large if difference is canonical system, control system ECU8 sends corresponding direct impulse, and pulsewidth is directly proportional to absolute difference size, controls drive motor 7 and rotates clockwise, move right to drive position regulation case 3.If for negative, difference illustrates that right side compression ratio is comparatively large, control system ECU8 sends corresponding negative-going pulse, and pulsewidth is directly proportional to the absolute value of difference equally, and now position regulation case 3 can be moved to the left accordingly.After completing a feedback regulation, system restarts record position data in next circulation, the control strategy doing to make new advances after a circulation.After the regulation and control of several circulation, the compression ratio of both sides reaches unanimity gradually.
Can by arranging to control system ECU8 the free adjustment realizing both sides compression ratio.Control thinking is as follows: after motor runs a circulation, control system ECU8 calculates the compression ratio of two cylinders, setting left end compression ratio a larger than right-hand member, if then left end compression ratio deducts right-hand member compression ratio absolute value and is greater than a, sends instruction control position regulating box 3 and moves right.Otherwise, be then moved to the left.After completing once regulation and control, start the feedback regulation of a new round in next circulation, until both sides compression ratio reaches setting value.
During encapsulation spring, the sensitivity of feedback regulation is higher, and spring can do energy-storage travelling wave tube when mover move, and the obstruction of moving to mover is less, but shortcoming is piston movement, and to arrive upper and lower stop spring larger to the regulating box left and right sides, position active force.
Embodiment 2
The free-piston internal combustion power generation power system that compression ratio is adjustable, comprises connecting rod 1, position-limit mechanism, tooth bar 5, gear 6, drive motor 7, control system ECU8, as shown in Figure 2;
Position-limit mechanism comprises: position regulation case 2, positioning rod 3, hydraulic damper 9;
Position-limit mechanism is placed between cylinder and motor; Connecting rod 1 is fixedly connected with both sides piston, electric mover respectively through position regulation case 2; Positioning rod 3 is fixed on connecting rod 1, is positioned at position regulation case 2 middle under system-down state; Hydraulic damper 9 is nested on connecting rod 1, and symmetry is installed on positioning rod 3 both sides; Tooth bar 5 is furnished with outside position regulation case 2; Position regulation case 2 has the side of tooth bar 5 to be connected with gear 6; Gear 6 is connected with drive motor 7; The controlled system ECU8 of drive motor 7 controls; Control system ECU8 is connected with motor driver, receives mover displacement information as control inputs amount.
Working procedure:
Under system-down state, positioning rod 3 is in the middle of position regulation case 2 by the effect of damper, and position regulation case 2 moves left and right and the decrement of its internal hydraulic pressure damper 9 can be made to change, and the stress balance of positioning rod 3 left and right sides is broken.Under hydraulic damper 9 acts on, positioning rod 3 and also can move corresponding displacement to the connecting rod 1 that it connects firmly, thus the position changing left and right two cylinder inner carriers.
System, under generating operation mode, respectively completes at motor left and right cylinder and once gets angry burning, after electric mover and connecting rod 1 are returned to enable position, assert that a work cycle completes.The run-length data of detect work cycle inside connecting rod 1 is transferred in control system ECU8 by the built-in displacement transducer of linear electric motor, according to data such as the length of connecting rod arranged before, cylinder head bottom, both sides distance, enable positions, control system ECU8 will calculate the compression ratio of piston in the cylinder of both sides, and deducts right side compression ratio with left hand cylinder compression ratio.Assert that left side compression ratio is comparatively large if difference is canonical system, control system ECU8 sends corresponding direct impulse, and pulsewidth is directly proportional to absolute difference size, controls drive motor 7 and rotates clockwise, move right to drive position regulation case 3.If for negative, difference illustrates that right side compression ratio is comparatively large, control system ECU8 sends corresponding negative-going pulse, and pulsewidth is directly proportional to the absolute value of difference equally, and now position regulation case 3 can be moved to the left accordingly.After completing a feedback regulation, system restarts record position data in next circulation, the control strategy doing to make new advances after a circulation.After the regulation and control of several circulation, the compression ratio of both sides reaches unanimity gradually.
Can by arranging to control system ECU8 the free adjustment realizing both sides compression ratio.Control thinking is as follows: after motor runs a circulation, control system ECU8 calculates the compression ratio of two cylinders, setting left end compression ratio a larger than right-hand member, if then left end compression ratio deducts right-hand member compression ratio absolute value and is greater than a, sends instruction control position regulating box 3 and moves right.Otherwise, be then moved to the left.After completing once regulation and control, start the feedback regulation of a new round in next circulation, until both sides compression ratio reaches setting value.
During encapsulation damper, feedback regulation sensitivity is lower, and mover motion needs overcome larger resistance, and drag size is by rate, but advantage is that suffered by system, impulsive load is less, and position regulation case both sides are less by active force, and lifetime of system is longer.
Above embodiment is only a specific embodiment of the present invention, is not intended to limit protection scope of the present invention.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (3)
1. the free-piston internal combustion power generation power system that compression ratio is adjustable, is characterized in that: comprise connecting rod (1), position-limit mechanism, tooth bar (5), gear (6), drive motor (7), control system ECU (8); Position-limit mechanism comprises: position regulation case (2), positioning rod (3), spring (4);
Position-limit mechanism is placed between cylinder and motor; Connecting rod (1) is fixedly connected with both sides piston, electric mover respectively through position regulation case (2); Positioning rod (3) is fixed on connecting rod (1), is positioned at position regulation case (2) middle under system-down state; Spring (4) is nested on connecting rod (1), and symmetry is installed on positioning rod (3) both sides; Position regulation case (2) outside is furnished with tooth bar (5); Position regulation case (2) has the side of tooth bar (5) to be connected with gear (6); Gear (6) is connected with drive motor (7); Drive motor (7) controlled system ECU (8) controls; Control system ECU (8) is connected with motor driver, receives mover displacement information as control inputs amount.
2. the free-piston internal combustion power generation power system that compression ratio as claimed in claim 1 is adjustable, is characterized in that: described spring (4) can also be substituted by hydraulic damper (9).
3. the free-piston internal combustion power generation power system that compression ratio as claimed in claim 1 is adjustable, is characterized in that: described working procedure is as follows:
Under system-down state, positioning rod (3) is in the middle of position regulation case (2) all the time by the effect of spring, position regulation case (2) moves left and right and the decrement of its contained spring (4) can be made to change, and the stress balance of positioning rod (3) left and right sides is broken; Under the action of the spring, positioning rod (3) and the connecting rod (1) connected firmly with it also can move corresponding displacement, thus change the position of left and right two cylinder inner carriers;
System, under generating operation mode, respectively completes at motor left and right cylinder and once gets angry burning, after electric mover and connecting rod (1) are returned to enable position, assert that a work cycle completes; The run-length data of detect work cycle inside connecting rod (1) is transferred in control system ECU (8) by the built-in displacement transducer of linear electric motor, according to data such as the length of connecting rod arranged before, cylinder head bottom, both sides distance, enable positions, control system ECU (8) will calculate the compression ratio of piston in the cylinder of both sides, and deducts right side compression ratio with left hand cylinder compression ratio; Assert that left side compression ratio is larger if difference is canonical system, control system ECU (8) sends corresponding direct impulse, pulsewidth is directly proportional to absolute difference size, controls drive motor (7) and rotates clockwise, move right to drive position regulation case (3); If for negative, difference illustrates that right side compression ratio is comparatively large, control system ECU (8) sends corresponding negative-going pulse, and pulsewidth is directly proportional to the absolute value of difference equally, and now position regulation case (3) can be moved to the left accordingly; After completing a feedback regulation, system restarts record position data in next circulation, the control strategy doing to make new advances after a circulation; After the regulation and control of several circulation, the compression ratio of both sides reaches unanimity gradually;
By arranging to control system ECU (8) free adjustment realizing both sides compression ratio; Control thinking is as follows: after motor runs a circulation, control system ECU (8) calculates the compression ratio of two cylinders, setting left end compression ratio a larger than right-hand member, if then left end compression ratio deducts right-hand member compression ratio absolute value and is greater than a, send instruction control position regulating box (3) and move right; Otherwise, be then moved to the left; After completing once regulation and control, start the feedback regulation of a new round in next circulation, 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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| 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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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106285994A (en) * | 2016-08-19 | 2017-01-04 | 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 |
| 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 |
| CN110799739A (en) * | 2017-04-10 | 2020-02-14 | 伊威斯发动机系统有限责任两合公司 | Length-adjustable connecting rod having a cylinder-piston unit with an anti-rotation part |
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| 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 |
| CN103498733A (en) * | 2013-09-29 | 2014-01-08 | 北京理工大学 | Movement and control method for free piston internal combustion engine generator |
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2015
- 2015-05-05 CN CN201510224810.XA patent/CN104806354B/en not_active Expired - Fee Related
Patent Citations (3)
| 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 |
| CN103498733A (en) * | 2013-09-29 | 2014-01-08 | 北京理工大学 | Movement and control method for free piston internal combustion engine generator |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN106285994A (en) * | 2016-08-19 | 2017-01-04 | 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 |
| 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 |
| CN110799739A (en) * | 2017-04-10 | 2020-02-14 | 伊威斯发动机系统有限责任两合公司 | Length-adjustable connecting rod having a cylinder-piston unit with an anti-rotation part |
| CN110799739B (en) * | 2017-04-10 | 2021-08-31 | 伊威斯发动机系统有限责任两合公司 | Length-adjustable connecting rod having a cylinder-piston unit with an anti-rotation part |
| 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 |
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