CN109297714A - A kind of electormagnetic braking sytem for fast compressor - Google Patents
A kind of electormagnetic braking sytem for fast compressor Download PDFInfo
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- CN109297714A CN109297714A CN201810922488.1A CN201810922488A CN109297714A CN 109297714 A CN109297714 A CN 109297714A CN 201810922488 A CN201810922488 A CN 201810922488A CN 109297714 A CN109297714 A CN 109297714A
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- braking
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- barn door
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/02—Details or accessories of testing apparatus
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Abstract
The present invention relates to a kind of electormagnetic braking sytems for fast compressor, including central control unit, the checking cylinder made of magnetic separator, across the push rod of checking cylinder, the electromagnetic braking annulus being fixed on checking cylinder and the electromagnetic braking piston being fixed on push rod, the first barn door being fixed on push rod, the second barn door, the photoelectric sensor being fixed near push rod and electromagnetic braking control circuit.It is embedded with circumferentially wound electromagnetic coil respectively on electromagnetic braking annulus and electromagnetic braking piston；Two barn doors, which are separately fixed at, to be needed to start to brake and terminate position when braking on corresponding push rod, and distance is equal to braking distance l between two barn doors, and photoelectric sensor is arranged at the first barn door when starting braking；Photoelectric sensor is admitted to central control unit to the detection signal of two barn doors.
Description
Technical field
The present invention is the control method based on fast compressor electormagnetic braking sytem, is related to technical field of engines, is had
Body is related to the Fast Compression brake system for simulation of engine.
Background technique
Fast compressor is a kind of infrastest platform for simulated engine compression and combustion process.It is by external force
Compression travel is carried out, piston is rapidly moved into top dead centre, cylinder interior gas is compressed, then will be lived with braking system
Plug stops, and gas in the jar is made to carry out the burning of high temperature and pressure, simulated engine single combustive process.By being fired to fast compressor
The research of burning process can obtain combustion case when engine runs to top dead centre in cylinder indirectly.Compared with engine, quickly
Compressor arrangement is simple, can temporarily abandon complex effects factor, only the compression and combustion process of research simulation internal combustion engine, separately
Outside, fast compressor can also more easily change its structure and such as start to simulate the burning under different engine conditions
Machine pinking greatly reduces the research and development cost of engine.
Traditional Fast Compression is confidential to be driven by air pressure, and the mode of hydraulic braking is run.But there are one for this method
A little defects.For example, hydraulic braking often causes the generation of Piston rebound phenomenon, so that thermodynamic state changes in cylinder,
The processes such as spontaneous combustion delay period, the in-cylinder combustion phase of fuel are influenced, so that experimental result be made to generate deviation.For this purpose, in view of electricity
The fast compressor of magnetic brake, it is necessary to a kind of control system is proposed, to make the more efficient stabilization of fast compressor work.
Summary of the invention
The purpose of the present invention is developing a kind of control method based on fast compressor electormagnetic braking sytem, it is based on electromagnetism
The structure of fast compressor is braked, technical method is as follows:
A kind of electormagnetic braking sytem for fast compressor, including central control unit, the system made of magnetic separator
Dynamic cylinder, across the push rod of checking cylinder, the electromagnetic braking annulus being fixed on checking cylinder and the electromagnetic braking being fixed on push rod
Piston, the first barn door being fixed on push rod, the second barn door, the photoelectric sensor and electromagnetic system being fixed near push rod
Dynamic control circuit, wherein be embedded with circumferentially wound electromagnetic coil respectively on electromagnetic braking annulus and electromagnetic braking piston；Two
A barn door, which is separately fixed at, needs to start to brake and terminate position when braking on corresponding push rod, between two barn doors
Distance is equal to braking distance l, and photoelectric sensor is arranged at the first barn door when starting braking；Photoelectric sensor is to two
The detection signal of a barn door is admitted to central control unit；Central control unit is obtained according to the detection signal of photoelectric sensor
Instantaneous velocity at this time is calculated to blocking the time for the first barn door, and according to the thickness m of the first barn door；Electromagnetic braking circle
Groove and protrusion is respectively set in ring and electromagnetic braking piston, when so as to the two contact, generates certain cooperation；
Electromagnetic braking control circuit includes DC power supply, slide rheostat and three switches, and three switches, one as logical
It disconnects and closing, after other two is connected together as change-over switch, DC power supply with slide rheostat and be connected in parallel on two mutually simultaneously
The both ends of the electromagnetic coil of connection, an electromagnetic coil be in series with for control electric current whether there is or not on-off switch, another electromagnetic wire
The both ends of circle are in series with respectively for controlling electric current whether there is or not two change-over switches with current direction, and DC power supply is used to provide electricity
Stream, slide rheostat are used to adjust the size of electric current to adjust the size of electromagnetic force.
Compared with prior art, the beneficial effects of the present invention are: the present invention uses control circuit and Dynamic matrix control unit, fortune
With reasonable control mode, reduces the generation of Piston rebound phenomenon, reduces brake oil, so that experimental data more accurately may be used
It leans on, thus more true simulated engine actual operating mode.The present invention is believed by sensor catch position signal and speed
Number, and it is fed back to current signal, to generate the electromagnetic force of size and speeds match, more accurately piston is stopped at desired
Position on, to reach better effect.
Detailed description of the invention
Fig. 1 is using electromagnetic braking fast compressor schematic diagram of the invention
Fig. 2 is arrangement of parts schematic diagram in checking cylinder of the present invention
Fig. 3 is electromagnetic control circuit schematic diagram of the present invention
Fig. 4 is control flow schematic diagram of the present invention
In figure:
1- burner 2- electormagnetic braking sytem 3- driving device 4- piston 5- is electromagnetically shielded checking cylinder
6- barn door a 7- barn door b 8- push rod 9- electromagnetic braking annulus 10- electromagnetic braking piston
11- photoelectric sensor
Specific embodiment
The technology of the present invention method is described in further detail with reference to the accompanying drawings and detailed description, but the present invention is simultaneously
Not limited to this specific embodiment, this description are not intended to limit the invention.
As shown in Figure 1, for using the structural schematic diagram of the fast compressor of electormagnetic braking sytem of the invention, including burning
Device 1, electormagnetic braking sytem 2, driving device 3 and piston 4.
Fig. 2 is the structural schematic diagram of electormagnetic braking sytem of the invention.Its checking cylinder 5 made of magnetic separator, passes through
The push rod 8 of checking cylinder, the electromagnetic braking annulus 9 being fixed on checking cylinder 5 and the electromagnetic braking piston 10 being fixed on push rod 8
With two barn doors 6,7 and the photoelectric sensor 11 being fixed near push rod.Two barn doors 6,7 and photoelectric sensor 11
Position pass through Experimental Calibration.
Equipped with insulation annulus on checking cylinder, inside is embedded with circumferentially wound electromagnetic coil, and the two constitutes electromagnetic braking annulus.
It is fixed with electromagnetic braking piston on push rod, is made of dielectric disc and the internal circumferentially wound electromagnetic coil being embedded with.Wherein,
The two electromagnetic coil material is identical, electric conductivity is identical.In addition, groove there are two electromagnetic braking annulus, and the electromagnetism on catch bar
Brake piston is corresponding to it there are two protrusion, when so as to the two contact, generates certain cooperation.
For barn door 6 with a thickness of m, the distance between two barn doors are l, and l is braking when piston slows down in braking process
Distance, Δ l are after electric current is reversed, and piston accelerates the distance stopped to the end due to obstruction.When the reception of photoelectric sensor 11
When device is not blocked by barn door, receiver can detecte the light of transmitter transmitting.When receiver is blocked by barn door, receive
Device can't detect transmitter, this signal is just passed to central control unit by photoelectric sensor at this time, and can be by blocking when
Between and the thickness m of barn door 6 calculate instantaneous velocity at this time.
Fig. 3 is electromagnetic braking control circuit schematic diagram, and by three switches L1, L21, L22, DC power supply slides variable resistance
Device P and conducting wire composition.Wherein, switch is used to control the presence or absence of electric current, i.e. the presence or absence of control electromagnetic force, and DC power supply is used to provide
Electric current, slide rheostat are used to adjust the size of electric current to adjust the size of electromagnetic force.
Fig. 4 is control flow schematic diagram, control process by sensor, central control unit, switch, slide rheostat Lai
It is common to complete.
Specific operation process of the present invention are as follows:
Step 1, corresponding in push rod when two barn doors 6,7 being separately mounted to need to start to brake and terminate to brake
8 position, barn door will have a certain distance with checking cylinder, prevent checking cylinder after end of braking from colliding with barn door, in addition,
Distance is equal to braking distance l between two barn doors, and photoelectric sensor 11 is installed at the barn door 6 when starting braking.By
Two hot-wire coil electromagnetic force formulas
Braking distance is tentatively estimated according to the initial velocity v of push rod combination when the size I that can be provided electric current and braking
l.Since electromagnetic system power is larger, braking effect is preferable, so it is smaller to be typically designed the distance between two barn doors 6,7 l.Separately
Outside, piston 4 and top dead centre after end of braking is made still to have small portion to restore distance, delta l, to allow electromagnetic braking piston 10
It is further fastened with electromagnetic braking annulus 9.Then when starting braking, the distance between two electromagnetic coils are L=l+ Δ l, at this point,
Photoelectric sensor is blocked by barn door a, and receiver can't detect transmitter.
Step 2, increase the gas pressure in driving cylinder 3, be closed at the switch L of electromagnetic coil1, L21Connect the end A, L22
The end A is connected, and adjusts the synchronous increase electric current of slide rheostat P, to make the electricity of electromagnetic braking annulus 9 and electromagnetic braking piston 10
Stream flow direction is conversely, because electric current can generate magnetic field, and the two generates mutually exclusive electromagnetic force, by the electromagnetism between two hot-wire coils
Power formula, which can be seen that increase electric current, can be such that electromagnetic force between the two increases, and the appropriate size of current that adjusts can make electromagnetic force and gas
To the gas dynamic balance of driving piston caused by cylinder pressure.When increasing to required pressure, control circuit is disconnected
Switch L1、L21、L22, the balance of push rod combination is destroyed, electromagnetic force disappears at this time, at this time due to the one-side effect of gas force,
Compression travel starts.
Step 3, push rod group moves downward, when detecting that first time position signal i.e. barn door a shelters from photoelectricity photoelectric transfer
When sensor, central control unit is by the thickness m of barn door 6 and blocks the initial velocity that the time calculates its push rod group.And by two
Hot-wire coil electromagnetic force formula and conservation of energy formula
Calculate size of current required when braking distance is l.Since in electromagnetic braking, electromagnetic force drives much larger than cylinder
Power here for the time being ignores cylinder driving force, only considers the influence of electromagnetic system power.At this point, central control unit closure control
Circuit switch L1, L21Connect the end A, L22The end A is connected, by automatically adjusting slide rheostat P, supplies corresponding electric current.At this point, still
Make the current direction of two electromagnetic coils on the contrary, still more much bigger than the electric current in equilibrium process theoretically.Reverse current is led
It sends a telegraph magnetic coil and generates mutually exclusive electromagnetic force, electromagnetic repulsive force hinders the movement of push rod combination as resistance.And two electromagnetism
The distance between coil constantly reduces, the continuous increase that this also results in electromagnetic force it can be seen from formula, to preferably reach
To the effect of electromagnetic braking.
Step 4, push rod group continues retarded motion to the left, due to the presence of cylinder driving force and the delayed impact of feedback,
When detecting second of position signal i.e. photoelectric sensor being blocked for the second time, piston 4 still have the speed of very little and with it is upper only
Point still has small portion distance, delta l, and at this moment central control unit will switch L21It is switched to the end B, L22It is switched to the end B, and appropriate
Change the size of electric current.At this point, the current direction in two electromagnetic coils is identical, the electromagnetic force to attract each other is generated, piston is made to exist
Top dead centre is fully achieved under the action of driving 3 gas force of cylinder and electromagnetic force, allow electromagnetic braking piston and electromagnetic braking annulus into
One step fastening, to prevent the generation of Piston rebound problem.Next by driving cylinder gas pressure and electromagnetic force jointly Lai
In-cylinder pressure caused by during balance combustion.
At the end of experiment, electromagnetic braking circuit switch L is disconnected1、L21、L22, shed the gas pressure in driving cylinder.And it adjusts
Slide rheostat P, with small reverse current closed electromagnetic brake switch L1, L21Connect the end A, L22The end A is connected, keeps its generation micro-
Weak mutually exclusive electromagnetic force, so that push rod group be made slowly to return to initial position.
To sum up, the present invention is the control method based on fast compressor electormagnetic braking sytem, including electormagnetic braking sytem
The installation of sensor, the design and electromagnetic braking control flow of electromagnetic braking circuit.With the control of the electormagnetic braking sytem
Method, the braking of more convenient accurate control fast compressor compression piston, has the control for brake of fast compressor
There is important role.
Claims (2)
1. a kind of electormagnetic braking sytem for fast compressor, including central control unit, the braking made of magnetic separator
Cylinder, across the push rod of checking cylinder, the electromagnetic braking annulus being fixed on checking cylinder and the electromagnetic braking being fixed on push rod are living
The first barn door, the second barn door, the photoelectric sensor being fixed near push rod and the electromagnetic braking fill in, being fixed on push rod
Control circuit, wherein be embedded with circumferentially wound electromagnetic coil respectively on electromagnetic braking annulus and electromagnetic braking piston；Two
Barn door, which is separately fixed at, to be needed to start to brake and terminate position when braking on corresponding push rod, the spacing of two barn doors
Photoelectric sensor is arranged at the first barn door when starting from equal to braking distance l, and braking；Photoelectric sensor is to two
The detection signal of barn door is admitted to central control unit；Central control unit is obtained according to the detection signal of photoelectric sensor
First barn door blocks the time, and calculates instantaneous velocity at this time according to the thickness m of the first barn door；
Electromagnetic braking control circuit includes DC power supply, slide rheostat and three switches, and three switches, one is opened as on-off
Close, after other two is connected together as change-over switch, DC power supply with slide rheostat and be connected in parallel on two it is parallel with one another
The both ends of electromagnetic coil, an electromagnetic coil be in series with for control electric current whether there is or not on-off switch, another electromagnetic coil
Both ends are in series with respectively for controlling electric current whether there is or not two change-over switches with current direction, and DC power supply is used to provide electric current,
Slide rheostat is used to adjust the size of electric current to adjust the size of electromagnetic force.
2. electormagnetic braking sytem according to claim 1, which is characterized in that electromagnetic braking annulus and electromagnetic braking piston point
Not She Zhi groove and protrusion, so as to the two contact when, generate certain cooperation.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810922488.1A CN109297714B (en) | 2018-08-14 | 2018-08-14 | Electromagnetic braking system for rapid compressor |
| PCT/CN2019/077567 WO2020034629A1 (en) | 2018-08-14 | 2019-03-08 | Electromagnetic braking system for rapid compression machine, and control method |
| US16/621,254 US11274714B2 (en) | 2018-08-14 | 2019-03-08 | Electromagnetic braking system and control method for rapid compression machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810922488.1A CN109297714B (en) | 2018-08-14 | 2018-08-14 | Electromagnetic braking system for rapid compressor |
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| Publication Number | Publication Date |
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| CN109297714A true CN109297714A (en) | 2019-02-01 |
| CN109297714B CN109297714B (en) | 2020-02-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201810922488.1A Active CN109297714B (en) | 2018-08-14 | 2018-08-14 | Electromagnetic braking system for rapid compressor |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020034629A1 (en) * | 2018-08-14 | 2020-02-20 | 天津大学 | Electromagnetic braking system for rapid compression machine, and control method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020034629A1 (en) * | 2018-08-14 | 2020-02-20 | 天津大学 | Electromagnetic braking system for rapid compression machine, and control method |
| US11274714B2 (en) * | 2018-08-14 | 2022-03-15 | Tianjin University | Electromagnetic braking system and control method for rapid compression machine |
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| Publication number | Publication date |
|---|---|
| CN109297714B (en) | 2020-02-07 |
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