CN115095426B - 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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- CN115095426B CN115095426B CN202210746505.7A CN202210746505A CN115095426B CN 115095426 B CN115095426 B CN 115095426B CN 202210746505 A CN202210746505 A CN 202210746505A CN 115095426 B CN115095426 B CN 115095426B
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- free piston
- eddy current
- internal combustion
- displacement detection
- current sensor
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- 238000006073 displacement reaction Methods 0.000 title claims abstract description 52
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 44
- 238000001514 detection method Methods 0.000 title claims abstract description 28
- 230000002000 scavenging effect Effects 0.000 claims abstract description 13
- 230000008859 change Effects 0.000 claims abstract description 9
- 239000000523 sample Substances 0.000 claims description 9
- 230000001133 acceleration Effects 0.000 claims description 5
- 239000004020 conductor Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 239000000446 fuel Substances 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
- 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 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
- 238000002347 injection Methods 0.000 description 1
- 239000007924 injection Substances 0.000 description 1
- 230000007774 longterm Effects 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
- 238000005507 spraying Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
-
- 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
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
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 combustion chamber; the free piston is arranged between the combustion chamber and the scavenging pump and in the linear motor shell, and can reciprocate left and right between the combustion chamber and the scavenging pump; the shaft of the free piston is provided with a plurality of grooves which are arranged at equal intervals in equal period; the electric eddy current sensor is arranged on the inner wall surface of the linear motor shell and is used for detecting an electric signal generated by movement change of the groove so as to realize displacement detection of the free piston. According to the invention, the eddy current sensor is adopted to measure the displacement of the free piston, so that the cost can be greatly reduced.
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-link mechanism, when the high-temperature high-pressure gas generated by fuel combustion pushes the free piston to do high-frequency reciprocating motion, the track of the free piston becomes difficult to determine, and the oil injection ignition and the 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 utilizing a laser technology, can accurately and non-contact measure the displacement change of a measured object, and can reach submicron level in precision. The grating sensor is a sensor for measuring displacement by adopting a grating stripe principle, and grating stripes formed by the grating have optical amplification effect and error average effect, so that the measuring precision can be improved, and the precision can reach a micron level. However, the laser sensor and the grating sensor are expensive and are not suitable for displacement detection of the free piston internal combustion linear generator.
The eddy current sensor is based on electromagnetic induction, high-frequency alternating current is applied to a detection coil in the sensor, the coil generates a variable alternating magnetic field, induced current is 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 change, and when the property of the coil is determined, the displacement change of the conductor can be obtained through calculation through the change of the impedance of the coil, so that the purpose of measuring the displacement is achieved.
The eddy current sensor can statically and dynamically measure the distance between the surfaces of the detected metal conductor probes in a non-contact, high-linearity and high-resolution mode, and is characterized by good long-term working reliability, high sensitivity, strong anti-interference capability, non-contact measurement, high response speed and no influence of oil-water and other mediums, and is often used for monitoring parameters such as shaft displacement, shaft vibration, shaft rotating speed and the like of large-scale machinery in real time for a long time 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 free piston internal combustion linear generator displacement detection device adopts high 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 combustion chamber is arranged in the linear motor shell;
the free piston is arranged between the combustion chamber and the scavenging pump and in the linear motor shell, and can reciprocate left and right between the combustion chamber and the scavenging pump;
the shaft of the free piston is provided with a plurality of grooves which are arranged at equal intervals in equal period;
the electric eddy current sensor is arranged on the inner wall surface of the linear motor shell and is used for detecting an electric signal generated by movement change of the groove so as to realize displacement detection of the free piston.
Preferably, a plurality of rows of grooves with fixed intervals are engraved on the shaft of the free piston;
each row of grooves has preset displacement difference.
Preferably, the number of the eddy current sensors is a plurality; each eddy current sensor corresponds to a row of grooves and is used for detecting electric signals generated by movement changes of the grooves in the row.
Preferably, the four eddy current sensors are mounted in succession at 90 ° intervals 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 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 2.4mm; the length of each cycle was 4.8mm.
Preferably, a linear encoder is also included;
the linear encoder is electrically connected with the eddy current sensor; the eddy current sensor is used for converting signals detected by the 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. according to the invention, the eddy current sensor is adopted to measure the displacement of the free piston, so that the cost can be greatly reduced;
2. according to the invention, four mutually opposite eddy current sensors are adopted, and four unique signals obtained by the sensors are combined through the position difference among the grooves, so that the measurement accuracy can be improved by four times;
3. the invention further improves the measurement accuracy 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 present invention will become more apparent upon reading of the detailed description of non-limiting embodiments, given with reference to the accompanying drawings in which:
FIG. 1 is an overall schematic of a free piston internal combustion linear generator in accordance with an embodiment of the present invention;
FIG. 2 is a schematic diagram of a displacement detection device according to an embodiment of the present invention;
FIG. 3 is a graph of the output electrical signal of the 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-scavenging pump; 6-coil windings; 7-a linear motor housing; 8-a coil spring; 9-exhaust port; 10-an oil spraying port; 11-a combustion chamber; 12-spark plugs; 13-air inlet; 14-free piston; 15-permanent magnets; a 16-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 present invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications could be made by those skilled in the art without departing from the inventive concept. These are all 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, 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 and in the linear motor housing 7, and can reciprocate left and right between the combustion chamber 11 and the scavenging pump 5;
the shaft of the free piston 14 is provided with a plurality of grooves 18 which are arranged at equal intervals in equal periods;
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 movement change of the groove 18 so as to realize displacement detection of the free piston 14.
In the embodiment of the present invention, a plurality of rows of grooves 18 with fixed intervals are engraved on the shaft of the free piston 14; there is a preset displacement difference between each row of grooves 18.
The number of the eddy current sensors 17 is plural; each eddy current sensor 17 corresponds to a row of grooves 18 for detecting an electrical signal generated by a change in movement of the grooves 18 in the row.
Fig. 2 is an overall schematic diagram 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 installed at intervals of 90 ° in sequence on the same plane perpendicular to the generator axis.
The probes of the eddy current sensors 17 are vertically aligned with the axis of the free piston 14 and the distance from each of the eddy current sensors 17 to the axis is equal.
The displacement difference is one quarter period, which is the distance between adjacent grooves 18 and the length of one groove 18 in the axial direction.
In the embodiment of the invention, 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 2.4mm; the length of each cycle was 4.8mm.
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 to 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 the free piston 14 may be further determined by interpolating the position value of the piston based on the velocity and acceleration of the free piston 14.
When the free piston internal combustion linear generator with displacement detection provided by the invention is used, high-temperature high-pressure gas generated by combustion of fuel 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 a groove 18 on the shaft of the free piston 14 moves to the position 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, the electric signal is output to a low level, the electric signal is output to a high level when the electric signal does not pass through the groove 18, then the electric signal is converted between the high level and the low level, one cycle is calculated from the high level to the 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 the electrical signal obtained by the encoder 16 converting the signals output by the four eddy current sensors 17, the low level representing the groove on the piston passing under the sensor probe. 1 represents a high level, 0 represents a low level, and when the electric signal is changed from a high level to a low level and then to a high level, it represents a cycle, and the width of the groove on the piston is 2.4mm, so that a cycle represents a piston displacement of 4.8mm. The electrical signal obtained from four sensors for less than one cycle is determined, for example, the electrical signal obtained from four sensors of ABCD is 1000, which represents displacement by 0.6mm, and the same thing 1100, 1110, 1111, 0111, 0011, 0001 represents displacement by 1.2, 1.8, 2.4, 3.0, 3.6, 4.2mm respectively. The measurement accuracy can then be further improved by software interpolation of the piston position values from the velocity and acceleration of the free piston 14.
The foregoing describes specific embodiments of the present invention. It is to be understood that the invention is not limited to the particular embodiments described above, and that various changes and modifications may be made by one skilled in the art within the scope of the claims without affecting the spirit of the invention.
Claims (9)
1. The 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 and in the linear motor shell, and can reciprocate left and right between the combustion chamber and the scavenging pump;
the shaft of the free piston is provided with a plurality of grooves which are arranged at equal intervals in equal period;
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;
a plurality of rows of grooves with fixed intervals are engraved on the shaft of the free piston;
the preset displacement difference is arranged between every two rows of grooves;
the displacement difference is a quarter period, and the period is the distance between adjacent grooves and the length of one groove in the axial direction; the number of the eddy current sensors is a plurality; each eddy current sensor corresponds to a row of grooves and is used for detecting electric signals generated by movement changes of the grooves in the row.
2. The free piston internal combustion linear generator with displacement detection of claim 1, wherein the number of eddy current sensors is a plurality; each eddy current sensor corresponds to a row of grooves and is used for detecting electric signals generated by movement changes of the grooves in the row.
3. A free piston internal combustion linear generator with displacement detection according to claim 2, characterized in that four eddy current sensors are mounted in sequence at 90 ° intervals on the same plane perpendicular to the generator axis.
4. The free piston internal combustion linear generator with displacement detection of claim 1, wherein the probes of the eddy current sensors are vertically aligned with the free piston axis and each of the eddy current sensors is equidistant from the axis.
5. The free piston internal combustion linear generator with displacement detection of claim 1, wherein the displacement difference is one quarter cycle, the cycle being the distance between adjacent grooves and the length of a groove in the axial direction.
6. The free piston internal combustion linear generator with displacement detection of claim 1, wherein the width of the groove is greater than the probe diameter of the eddy current sensor.
7. A free piston internal combustion linear generator with displacement detection according to claim 1, characterized in that the width of the groove is set to 2.4mm; the length of each cycle was 4.8mm.
8. The free-piston internal combustion linear generator with displacement detection of claim 1, further comprising a linear encoder;
the linear encoder is electrically connected with the eddy current sensor; the eddy current sensor is used for converting signals detected by the eddy current sensor into electric signals and outputting low level or high level.
9. The free piston internal combustion linear generator with displacement detection of claim 1, wherein the free piston displacement is further determined based on interpolation of the free piston velocity and acceleration to the piston position value.
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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| CN115095426A CN115095426A (en) | 2022-09-23 |
| CN115095426B true 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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| CN115095426A (en) | 2022-09-23 |
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