CN115095426A - Free piston internal combustion linear generator with displacement detection - Google Patents
Free piston internal combustion linear generator with displacement detection Download PDFInfo
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- CN115095426A CN115095426A CN202210746505.7A CN202210746505A CN115095426A CN 115095426 A CN115095426 A CN 115095426A CN 202210746505 A CN202210746505 A CN 202210746505A CN 115095426 A CN115095426 A CN 115095426A
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- free piston
- eddy current
- internal combustion
- displacement
- current sensor
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 51
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 44
- 238000001514 detection method Methods 0.000 title claims abstract description 22
- 230000002000 scavenging effect Effects 0.000 claims abstract description 14
- 230000008859 change Effects 0.000 claims abstract description 11
- 239000000523 sample Substances 0.000 claims description 9
- 230000001133 acceleration Effects 0.000 claims description 5
- 238000005259 measurement Methods 0.000 description 5
- 239000004020 conductor Substances 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- PCTMTFRHKVHKIS-BMFZQQSSSA-N (1s,3r,4e,6e,8e,10e,12e,14e,16e,18s,19r,20r,21s,25r,27r,30r,31r,33s,35r,37s,38r)-3-[(2r,3s,4s,5s,6r)-4-amino-3,5-dihydroxy-6-methyloxan-2-yl]oxy-19,25,27,30,31,33,35,37-octahydroxy-18,20,21-trimethyl-23-oxo-22,39-dioxabicyclo[33.3.1]nonatriaconta-4,6,8,10 Chemical compound C1C=C2C[C@@H](OS(O)(=O)=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2.O[C@H]1[C@@H](N)[C@H](O)[C@@H](C)O[C@H]1O[C@H]1/C=C/C=C/C=C/C=C/C=C/C=C/C=C/[C@H](C)[C@@H](O)[C@@H](C)[C@H](C)OC(=O)C[C@H](O)C[C@H](O)CC[C@@H](O)[C@H](O)C[C@H](O)C[C@](O)(C[C@H](O)[C@H]2C(O)=O)O[C@H]2C1 PCTMTFRHKVHKIS-BMFZQQSSSA-N 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 230000007774 longterm Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000005674 electromagnetic induction Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000004044 response Effects 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Images
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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B33/00—Engines characterised by provision of pumps for charging or scavenging
- F02B33/02—Engines with reciprocating-piston pumps; Engines with crankcase pumps
- F02B33/06—Engines with reciprocating-piston pumps; Engines with crankcase pumps with reciprocating-piston pumps other than simple crankcase pumps
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B33/00—Engines characterised by provision of pumps for charging or scavenging
- F02B33/44—Passages conducting the charge from the pump to the engine inlet, e.g. reservoirs
-
- 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
- F02B63/00—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices
- F02B63/04—Adaptations of engines for driving pumps, hand-held tools or electric generators; Portable combinations of engines with engine-driven devices for electric generators
- F02B63/041—Linear electric generators
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B7/00—Measuring arrangements characterised by the use of electric or magnetic techniques
- G01B7/02—Measuring arrangements characterised by the use of electric or magnetic techniques for measuring length, width or thickness
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02K—DYNAMO-ELECTRIC MACHINES
- H02K35/00—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit
- H02K35/02—Generators with reciprocating, oscillating or vibrating coil system, magnet, armature or other part of the magnetic circuit with moving magnets and stationary coil systems
Abstract
The invention provides a free piston internal combustion linear generator with displacement detection, which comprises a linear motor shell, a combustion chamber, a free piston, a scavenging pump and an eddy current sensor, wherein the combustion chamber is arranged in the linear motor shell; the free piston is arranged between the combustion chamber and the scavenging pump, is arranged in the linear motor shell and can reciprocate left and right between the combustion chamber and the scavenging pump; a plurality of grooves which are arranged at equal intervals in equal periods are arranged on a shaft of the free piston; and the inner wall surface of the linear motor shell is provided with an eddy current sensor which is used for detecting an electric signal generated by the movement change of the groove so as to realize the displacement detection of the free piston. The invention adopts the eddy current sensor to measure the displacement of the free piston, and can greatly reduce the cost.
Description
Technical Field
The invention relates to the technical field of displacement sensors, in particular to a free piston internal combustion linear generator with displacement detection.
Background
Compared with the traditional rotary internal combustion engine, the free piston internal combustion linear generator lacks a crank connecting rod mechanism, when high-temperature and high-pressure gas generated by fuel combustion pushes the free piston to do high-frequency reciprocating motion, the track of the free piston is difficult to determine, and an oil injection ignition and electric control system of the free piston internal combustion linear generator are established on the basis of the track of the free piston, so that the realization of high-precision free piston displacement detection is particularly important.
The sensors currently applied to the high-precision displacement detection device mainly comprise a laser sensor, a grating sensor, an eddy current sensor and the like. The laser sensor is a sensor for measuring displacement by using a laser technology, can accurately measure the displacement change of a measured object in a non-contact manner, and the precision can reach the submicron level. The grating sensor is a sensor for measuring displacement by adopting a grating-stacked stripe principle, and the stacked stripe formed by the grating has an optical amplification effect and an error averaging effect, so that the measurement precision can be improved and can reach a micron level. However, laser sensors and grating sensors are expensive and are not suitable for displacement detection of free piston internal combustion linear generators.
The eddy current sensor is based on electromagnetic induction, a high-frequency alternating current is applied to a detection coil in the sensor, the coil generates a changing alternating magnetic field, induced current can be excited in a nearby metal conductor, the alternating magnetic field of the induced current and the alternating magnetic field of the coil generate a superposition effect, when the distance between the coil and the conductor changes, the inductance and the resistance in the coil can change, when the property of the coil is determined, the displacement change of the conductor can be calculated through the change of the impedance of the coil, and the purpose of measuring the displacement is achieved.
The eddy current sensor can statically and dynamically measure the distance of the surface of a measured metal conductor probe in a non-contact manner with high linearity and high resolution, has the characteristics of good long-term working reliability, high sensitivity, strong anti-interference capability, non-contact measurement and high response speed, is not influenced by media such as oil, water and the like, and is often used for carrying out long-term real-time monitoring on parameters such as shaft displacement, shaft vibration, shaft rotating speed and the like of large-scale machinery and analyzing the working condition of equipment.
Disclosure of Invention
Aiming at the defects in the prior art, the invention aims to provide a displacement detection device based on an eddy current sensor, which solves the problem that the current displacement detection device of a free piston internal combustion linear generator adopts expensive sensor equipment to ensure the precision, and greatly reduces the cost while ensuring the precision.
The invention provides a free piston internal combustion linear generator with displacement detection, which is characterized by comprising a linear motor shell, a combustion chamber, a free piston, a scavenging pump and an eddy current sensor, wherein the free piston is arranged in the combustion chamber;
the free piston is arranged between the combustion chamber and the scavenging pump, is arranged in the linear motor shell and can reciprocate left and right between the combustion chamber and the scavenging pump;
a plurality of grooves which are arranged at equal intervals in equal periods are arranged on a shaft of the free piston;
and the inner wall surface of the linear motor shell is provided with an eddy current sensor which is used for detecting an electric signal generated by the movement change of the groove so as to realize the displacement detection of the free piston.
Preferably, a plurality of rows of grooves with fixed intervals are carved on the shaft of the free piston;
each row of grooves has a preset displacement difference.
Preferably, the number of the eddy current sensors is multiple; each eddy current sensor corresponds to a row of grooves and is used for detecting an electric signal generated by movement change of the grooves in the row.
Preferably, four eddy current sensors are mounted sequentially 90 ° apart on the same plane perpendicular to the generator axis.
Preferably, the probes of the eddy current sensors are vertically aligned with the axis of the free piston, and each of the eddy current sensors is equidistant from the axis.
Preferably, the displacement difference is one quarter of a period, the period being the distance between adjacent grooves and the length of a groove in the axial direction.
Preferably, the width of the groove is larger than the probe diameter of the eddy current sensor.
Preferably, the width of the groove is set to be 2.4 mm; the length of each period is 4.8 mm.
Preferably, a linear encoder is further included;
the linear encoder is electrically connected with the eddy current sensor; the electric eddy current sensor is used for converting signals detected by the electric eddy current sensor into electric signals and outputting low level or high level.
Preferably, the displacement of the free piston is further determined by interpolating the position value of the piston from the velocity and acceleration of the free piston.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention adopts the eddy current sensor to measure the displacement of the free piston, thus greatly reducing the cost;
2. in the invention, four eddy current sensors which are opposite to each other are adopted, and four unique signals obtained by the sensors are combined through the position difference between the grooves, so that the measurement precision can be improved by four times;
3. the invention further improves the measurement precision by interpolating the position value of the piston according to the speed and the acceleration of the free piston.
Drawings
Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:
FIG. 1 is a schematic overall view of a free piston internal combustion linear generator according to an embodiment of the present invention;
FIG. 2 is a schematic overall view of a displacement detecting device according to an embodiment of the present invention;
FIG. 3 is a diagram of an electrical signal output by an encoder in an embodiment of the present invention.
In the figure: 1-a check valve; 2-a pressure gauge; 3-a safety valve; 4-a buffer tank; 5-a scavenging pump; 6-a coil winding; 7-linear motor housing; 8-a coil spring; 9-an exhaust port; 10-oil injection ports; 11-a combustion chamber; 12-a spark plug; 13-an air inlet; 14-a free piston; 15-a permanent magnet; 16-a linear encoder; 17-an eddy current sensor; 18-grooves.
Detailed Description
The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the concept of the invention. All falling within the scope of the present invention.
Fig. 1 is an overall schematic diagram of a free piston internal combustion linear generator according to an embodiment of the present invention, and as shown in fig. 1, the free piston internal combustion linear generator with displacement detection provided by the present invention includes a linear motor housing 7, a combustion chamber 11, a free piston 14, a scavenging pump 5, and an eddy current sensor 17;
the free piston 14 is arranged between the combustion chamber 11 and the scavenging pump 5, is arranged in the linear motor shell 7, and can reciprocate left and right between the combustion chamber 11 and the scavenging pump 5;
a plurality of grooves 18 which are arranged at equal intervals in equal periods are arranged on the shaft of the free piston 14;
an eddy current sensor 17 is arranged on the inner wall surface of the linear motor shell 7, and the eddy current sensor 17 is used for detecting an electric signal generated by the movement change of the groove 18 so as to realize the displacement detection of the free piston 14.
In the present embodiment, the free piston 14 has a plurality of rows of grooves 18 engraved on its axis at regular intervals; each row of grooves 18 has a preset displacement difference therebetween.
The number of the eddy current sensors 17 is multiple; each eddy current sensor 17 corresponds to a row of grooves 18 for detecting an electrical signal generated by a change in the movement of the row of grooves 18.
Fig. 2 is an overall schematic view of a displacement detecting device according to an embodiment of the present invention, and as shown in fig. 2, four eddy current sensors 17 are sequentially installed at 90 ° intervals on the same plane perpendicular to the generator axis.
The probes of the eddy current sensors 17 are aligned perpendicularly to the axis of the free piston 14, and each of the eddy current sensors 17 is equidistant from the axis.
The displacement difference is one quarter of a period, which is the distance between adjacent grooves 18 and the length of one groove 18 in the axial direction.
In the present embodiment, the width of the groove 18 is larger than the probe diameter of the eddy current sensor 17. The width of the groove 18 is set to be 2.4 mm; the length of each period is 4.8 mm.
In the embodiment of the invention, the free piston internal combustion linear generator with displacement detection further comprises a linear encoder;
the linear encoder is electrically connected with the eddy current sensor 17; the eddy current sensor 17 is configured to convert a signal detected by the eddy current sensor 17 into an electrical signal and output a low level or a high level.
The displacement of free piston 14 may be further determined by interpolating piston position values based on the velocity and acceleration of free piston 14.
When the free piston internal combustion linear generator with displacement detection is provided by the invention, high-temperature and high-pressure gas generated by fuel combustion in the combustion chamber 11 pushes the free piston 14 to reciprocate left and right between the combustion chamber 11 and the scavenging pump 5, when the groove 18 on the shaft of the free piston 14 moves right below the eddy current sensor 17, the impedance of a coil on a probe in the eddy current sensor 17 changes to generate a signal, the linear encoder 16 converts the signal into an electric signal and outputs low level, when the signal does not pass through the groove 18, the high level is output, then the electric signal is converted between the high level and the low level, one cycle is calculated by one high level and one low level, and the displacement of the piston can be calculated according to the cycle times. The amount of displacement for less than one cycle is calculated in combination with the electrical signals output by the four encoders 16.
Fig. 3 shows an electrical signal obtained by the encoder 16 converting the signals output by the four eddy current sensors 17, and a low level indicates that the groove on the piston passes under the sensor probe. 1 represents high and 0 represents low, and when the electrical signal changes from high to low and then high to represent a cycle, the width of the groove on the piston is 2.4mm, so that a cycle represents 4.8mm of piston displacement. Less than one cycle is judged according to the electric signals obtained by the four sensors, for example, the electric signals obtained by the four sensors of the ABCD are 1000, which represents that the displacement is 0.6mm, and the electric signals obtained by the four sensors of the ABCD are respectively 1.2, 1.8, 2.4, 3.0, 3.6 and 4.2mm in the same way of 1100, 1110, 1111, 0111, 0011 and 0001. The accuracy of the measurement can then be further improved by software interpolating the position value of the piston based on the velocity and acceleration of the free piston 14.
The foregoing description of specific embodiments of the present invention has been presented. It is to be understood that the present invention is not limited to the specific embodiments described above, and that various changes or modifications may be made by one skilled in the art within the scope of the appended claims without departing from the spirit of the invention.
Claims (10)
1. A free piston internal combustion linear generator with displacement detection is characterized by comprising a linear motor shell, a combustion chamber, a free piston, a scavenging pump and an eddy current sensor;
the free piston is arranged between the combustion chamber and the scavenging pump, is arranged in the linear motor shell and can reciprocate left and right between the combustion chamber and the scavenging pump;
a plurality of grooves which are arranged at equal intervals in equal periods are arranged on a shaft of the free piston;
and the inner wall surface of the linear motor shell is provided with an eddy current sensor which is used for detecting an electric signal generated by the movement change of the groove so as to realize the displacement detection of the free piston.
2. A free piston internal combustion linear generator with displacement sensing as claimed in claim 1, wherein the free piston shaft is engraved with a plurality of rows of grooves at fixed intervals;
each row of grooves has a preset displacement difference.
3. A free piston internal combustion linear generator with displacement sensing as claimed in claim 2, wherein the number of eddy current sensors is plural; each eddy current sensor corresponds to a row of grooves and is used for detecting an electric signal generated by movement change of the grooves in the row.
4. A free piston internal combustion linear generator with displacement sensing as claimed in claim 3, wherein four eddy current sensors are mounted sequentially 90 ° apart on the same plane perpendicular to the generator axis.
5. A free piston internal combustion linear generator with displacement sensing as claimed in claim 1, wherein the probes of said eddy current sensors are aligned perpendicular to the free piston axis and each of said eddy current sensors is equidistant from the axis.
6. A free piston internal combustion linear generator with displacement sensing as claimed in claim 2, wherein the displacement difference is one quarter of a cycle, the cycle being the distance between adjacent grooves and the length of a groove in the axial direction.
7. A free piston internal combustion linear generator with displacement sensing as claimed in claim 1, wherein the width of the groove is greater than the probe diameter of the eddy current sensor.
8. A free piston internal combustion linear generator with displacement detection as claimed in claim 1, wherein the width of the groove is set to 2.4 mm; the length of each period is 4.8 mm.
9. A free piston internal combustion linear generator with displacement detection as claimed in claim 1 further comprising a linear encoder;
the linear encoder is electrically connected with the eddy current sensor; the electric eddy current sensor is used for converting signals detected by the electric eddy current sensor into electric signals and outputting low level or high level.
10. A free piston internal combustion linear generator with displacement detection as claimed in claim 1, wherein the displacement of the free piston is further determined by interpolating the position value of the piston from the velocity and acceleration of the free piston.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210746505.7A CN115095426B (en) | 2022-06-29 | 2022-06-29 | Free piston internal combustion linear generator with displacement detection |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210746505.7A CN115095426B (en) | 2022-06-29 | 2022-06-29 | Free piston internal combustion linear generator with displacement detection |
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| Publication Number | Publication Date |
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| CN115095426A true CN115095426A (en) | 2022-09-23 |
| CN115095426B CN115095426B (en) | 2024-01-12 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1193846A (en) * | 1997-09-18 | 1999-04-06 | Daikin Ind Ltd | Piston position detecting device and detecting method for linear reciprocating compressor |
| CN1888402A (en) * | 2006-07-20 | 2007-01-03 | 上海交通大学 | Free-piston type internal combustion engine power generating system |
| CN203847370U (en) * | 2014-05-24 | 2014-09-24 | 智胜化工股份有限公司 | Displacement detection device of reciprocating type hydrogen nitrogen compressor piston rod |
| CN205785817U (en) * | 2016-06-26 | 2016-12-07 | 新疆西部明珠工程建设有限公司 | Bearing in rotating machinery vibration measurement device |
| CN110657807A (en) * | 2019-09-30 | 2020-01-07 | 西安电子科技大学 | Indoor positioning displacement measurement method for detecting discontinuity based on wavelet transformation |
| CN110778392A (en) * | 2019-07-23 | 2020-02-11 | 上海交通大学 | Free piston type internal combustion engine generator |
-
2022
- 2022-06-29 CN CN202210746505.7A patent/CN115095426B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH1193846A (en) * | 1997-09-18 | 1999-04-06 | Daikin Ind Ltd | Piston position detecting device and detecting method for linear reciprocating compressor |
| CN1888402A (en) * | 2006-07-20 | 2007-01-03 | 上海交通大学 | Free-piston type internal combustion engine power generating system |
| CN203847370U (en) * | 2014-05-24 | 2014-09-24 | 智胜化工股份有限公司 | Displacement detection device of reciprocating type hydrogen nitrogen compressor piston rod |
| CN205785817U (en) * | 2016-06-26 | 2016-12-07 | 新疆西部明珠工程建设有限公司 | Bearing in rotating machinery vibration measurement device |
| CN110778392A (en) * | 2019-07-23 | 2020-02-11 | 上海交通大学 | Free piston type internal combustion engine generator |
| CN110657807A (en) * | 2019-09-30 | 2020-01-07 | 西安电子科技大学 | Indoor positioning displacement measurement method for detecting discontinuity based on wavelet transformation |
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| CN115095426B (en) | 2024-01-12 |
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