CN107654359A - Reciprocating compressor stroke anticollision control method, reciprocating compressor and refrigerator - Google Patents
Reciprocating compressor stroke anticollision control method, reciprocating compressor and refrigerator Download PDFInfo
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- CN107654359A CN107654359A CN201710631963.5A CN201710631963A CN107654359A CN 107654359 A CN107654359 A CN 107654359A CN 201710631963 A CN201710631963 A CN 201710631963A CN 107654359 A CN107654359 A CN 107654359A
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- 238000000034 method Methods 0.000 title claims abstract description 34
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- 238000001514 detection method Methods 0.000 claims abstract description 25
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- 230000009467 reduction Effects 0.000 claims description 8
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- 238000006073 displacement reaction Methods 0.000 abstract description 11
- 238000009434 installation Methods 0.000 abstract description 4
- 238000005516 engineering process Methods 0.000 description 6
- 230000008859 change Effects 0.000 description 5
- 239000003507 refrigerant Substances 0.000 description 5
- 230000006835 compression Effects 0.000 description 4
- 238000007906 compression Methods 0.000 description 4
- 230000005611 electricity Effects 0.000 description 4
- 230000008569 process Effects 0.000 description 4
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- 230000033228 biological regulation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000035939 shock Effects 0.000 description 2
- 230000032258 transport Effects 0.000 description 2
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
- F04B49/06—Control using electricity
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B51/00—Testing machines, pumps, or pumping installations
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
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- Combustion & Propulsion (AREA)
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- Compressor (AREA)
- Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses a kind of reciprocating compressor stroke anticollision control method, reciprocating compressor and refrigerator, the reciprocating compressor stroke anticollision control method, comprise the following steps：（1）, the coil-induced counter electromotive force of collection；（2）, by the counter electromotive force carry out zero passage detection；（3）, secondary derivation is carried out to back emf curve, obtain secondary derivation value, when being judged as that piston is run to top dead centre, compare the absolute value of current secondary derivation value and threshold value t1 size.The reciprocating compressor stroke anticollision control method of the present invention, cost and the space of the detection device such as current installation displacement transducer are saved；By software, the low and high level according to caused by zero crossing circuitry judges compressor position, prevents piston slap exhaust valve plate.
Description
Technical field
The present invention relates to Compressor Technology field, is to be related to a kind of reciprocating compressor stroke anticollision control specifically
Method, reciprocating compressor and refrigerator.
Background technology
In general, reciprocating compressor is by the way of, piston in the inside of cylinder while carry out linear reciprocation fortune
It is dynamic, while sucking refrigerant and being discharged after being compressed.
The stroke that the defects of one very big is piston be present and limited without rigidity in the reciprocating compressor of existing linear motion,
And determined completely by the waveform and size of driving voltage.Traditional rotary piston compressor piston displacement has rigid limitation, because
This is on the premise of rational design, the problem of collision in the absence of piston and valve plate；And Linearkompressor is in driven compressor voltage
It is abnormal, or when starting current is excessive, piston stroke is excessive, will bump against with valve plate.Due to traditional suction and exhaust structure
Middle valve plate is completely fixed, and suction is completed only by the opposite air-breathing of the conducting direction installed on valve plate and exhaust valve plate
Gas, then after bumping against, badly damaged, the working condition of meeting strong influence compressor, reduction can be caused to valve plate and piston
Service life.The major way for solving this problem at present is to use sensor coil, or the side of set location detection sensor
Formula, the shortcomings that being controlled using sensor coil：On the one hand coiler part space is occupied, causes motor copper factor to decline, from
And capacity motor reduces；The ability of another aspect sensor coil anti-main coil interference is weak, easily failure, meanwhile, sensor coil can
It is relatively low by property；The shortcomings that being controlled using sensor：In addition to the space of displacement transducer is installed, the processing of displacement transducer
And assembly cost is higher, reliability is poor.
The content of the invention
The present invention needs separately to set detection coil or displacement sensing to solve the reciprocating compressor of existing linear motion
The position realization that the mode of device detects piston prevents piston slap valve block, has the high technology in occupancy motor internal space, cost
Problem, it is proposed that a kind of reciprocating compressor stroke anticollision control method, can solve the above problems.
In order to solve the above-mentioned technical problem, the present invention is achieved using following technical scheme：
A kind of reciprocating compressor stroke anticollision control method, comprises the following steps：
（1）, the coil-induced counter electromotive force of collection；
（2）, by the counter electromotive force carry out zero passage detection, be judged as piston when counter electromotive force is from high level saltus step into low level
Operation, when counter electromotive force is from low transition into high level, is judged as that piston is run to lower dead center to top dead centre；
（3）, secondary derivation is carried out to back emf curve, obtain secondary derivation value, when being judged as that piston is run to top dead centre,
Compare the absolute value of current secondary derivation value and threshold value t1 size, if the absolute value of current secondary derivation value is more than threshold value t1,
Then being run in next piston from lower dead center to top dead centre direction reduces the power being applied on the coil in stroke, until full
The absolute value of the secondary derivation value of foot is not more than threshold value t1, wherein, t1 ＞ 0.
Further, step（2）In, judge that the method that piston is run to top dead centre or lower dead center is：To counter electromotive force
Curve carries out secondary derivation by fixed frequency, if secondary derivation value is 0, when counter electromotive force is from high level saltus step into low level
It is judged as that piston is run to top dead centre, when counter electromotive force is from low transition into high level, is judged as that piston is run to lower and stops
Point；
If secondary derivation value is not 0, while meets counter electromotive force from high level saltus step into low level, and secondary derivation value is from just
It is judged as that piston is run to top dead centre when value saltus step is into negative value；And
Meet counter electromotive force simultaneously from low transition into high level, and secondary derivation value from negative value saltus step on the occasion of when judge
Run for piston to top dead centre.
Further, step（3）In, when reduction is applied to the power on the coil, according to（2%~5%）* P step
Long to reduce, wherein P is the initial power being applied on the coil.
Further, step（3）In, the mode for reducing the power being applied on the coil is to reduce to be applied to the line
Voltage on circle.
Based on above-mentioned reciprocating compressor stroke anticollision control method, the present invention proposes a kind of reciprocating compression simultaneously
Machine, including housing, cylinder, mover, with the mover fix piston, be fixed on housing coil, be fixed on the mover
On permanent magnet and control circuit, the control circuit include master chip control module, press drive module, zero passage detection electricity
Road, counter electromotive force Acquisition Circuit, the both ends of the coil respectively with the press drive module, zero cross detection circuit, anti-electronic
Gesture Acquisition Circuit is connected, and the reciprocating compressor is used with down stroke anticollision control method：
（1）, counter electromotive force Acquisition Circuit gathers coil-induced counter electromotive force and sends to the master chip control module；
（2）, zero cross detection circuit the counter electromotive force is subjected to zero passage detection, when counter electromotive force is from high level saltus step into low level
When be judged as that piston is run to top dead centre, when counter electromotive force is from low transition into high level, be judged as that piston is run under
Stop；
（3）, the master chip control module secondary derivation is carried out to back emf curve, secondary derivation value is obtained, when being judged as
When piston is run to top dead centre, compare the absolute value of current secondary derivation value and threshold value t1 size, if current secondary derivation value
Absolute value be more than threshold value t1, then next piston from lower dead center to top dead centre direction run stroke in, driven by press
Module reduces the power being applied on the coil, until meet that the absolute value of secondary derivation value is not more than threshold value t1, wherein, t1
＞ 0.
Further, step（2）In, judge that the method that piston is run to top dead centre or lower dead center is：To counter electromotive force
Curve carries out secondary derivation by fixed frequency, if secondary derivation value is 0, when counter electromotive force is from high level saltus step into low level
It is judged as that piston is run to top dead centre, when counter electromotive force is from low transition into high level, is judged as that piston is run to lower and stops
Point；
If secondary derivation value is not 0, while meets counter electromotive force from high level saltus step into low level, and secondary derivation value is from just
It is judged as that piston is run to top dead centre when value saltus step is into negative value；And
Meet counter electromotive force simultaneously from low transition into high level, and secondary derivation value from negative value saltus step on the occasion of when judge
Run for piston to top dead centre.
Further, step（3）In, when reduction is applied to the power on the coil, according to（2%~5%）* P step
Long to reduce, wherein P is the initial power being applied on the coil.
Further, step（3）In, the mode for reducing the power being applied on the coil is to reduce to be applied to the line
Voltage on circle.
The present invention proposes a kind of refrigerator, including the above reciprocating compressor described in any one simultaneously.
Compared with prior art, the advantages and positive effects of the present invention are：The reciprocating compressor stroke anticollision of the present invention
Control method, first, without separately setting the devices such as displacement transducer or sensor coil inside compressor, but pressed by gathering
The counter electromotive force that the coil that contracting machine carries is sensed, anti-electrodynamic type is carried out to the mode of software processing analysis and zero passage detection,
Judge the current running position of piston, on the one hand save the cost and sky of the detection device such as current installation displacement transducer
Between, reduce the cost and volume of linear compressor body；On the other hand by software can according to caused by zero crossing circuitry height electricity
It is flat to judge that compressor has run to close exhaust valve plate one end and has also been proximate to rear baffle one end at present, prevent piston slap air bleeding valve
Piece, furthermore, by analyzing back emf curve, it can be determined that go out the intensity of piston slap exhaust valve plate, it is adaptive to adjust
The whole power being applied on the coil, fundamentally solves the Impact Problems to valve block, while ensure that piston rod energy
Valve block is arrived to open valve block top.
After the detailed description of embodiment of the present invention is read in conjunction with the figure, the other features and advantages of the invention will become more
Add clear.
Brief description of the drawings
In order to illustrate more clearly about the embodiment of the present invention or technical scheme of the prior art, below will be to embodiment or existing
There is the required accompanying drawing used in technology description to be briefly described, it should be apparent that, drawings in the following description are only this
Some embodiments of invention, for those of ordinary skill in the art, on the premise of not paying creative work, can be with
Other accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is a kind of example structure schematic diagram of reciprocating compressor proposed by the invention；
Fig. 2 be reciprocating compressor stroke anticollision control method proposed by the invention a kind of embodiment according to counter electromotive force
Zero crossing judges compressor operating position view；
Fig. 3 be reciprocating compressor stroke anticollision control method proposed by the invention a kind of embodiment in compressor normally transport
Back emf curve during row；
Fig. 4 be reciprocating compressor stroke anticollision control method proposed by the invention a kind of embodiment in compressor hit row
Back emf curve during air valve plate；
Fig. 5 be reciprocating compressor proposed by the invention a kind of embodiment in control circuit principle block diagram.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Site preparation describes, it is clear that described embodiment is only part of the embodiment of the present invention, rather than whole embodiments.It is based on
Embodiment in the present invention, those of ordinary skill in the art are obtained every other under the premise of creative work is not made
Embodiment, belong to the scope of protection of the invention.
Embodiment one
The present embodiment proposes a kind of reciprocating compressor stroke anticollision control method, wherein, it is past employed in the present embodiment
Twin compressor is as shown in figure 1, the coil 1 of compressor is passed through caused alternating magnetic field after alternating current, and permanent magnet 2 is in alternation magnetic
Moved back and forth under field action, so as to be moved back and forth with piston 3 in cylinder 4, air-breathing, compression, final row are completed in cylinder 4
The process of gas, 3 continuous air-breathing of piston, compression, exhaust, so as to reach the purpose of refrigeration.
Reciprocating compressor in a manner of moving along a straight line by the compression refrigerant of piston 3, in linear motion coil 1
Permanent magnet 2 can be cut, so as to produce counter electromotive force.It is anti-electronic caused by controller hardware zero crossing circuitry collection reciprocating compressor
Gesture.The change of counter electromotive force is monitored according to zero passage sample circuit, counter electromotive force is when the speed of the cutting magnetic field of coil 1 is zero
Zero, as shown in Fig. 2 when counter electromotive force is zero, zero passage sample circuit produces the saltus step of a level.So as to monitor piston
Run to current stroke（Close to rear baffle or exhaust valve plate）Position.Wherein piston is top dead centre close to exhaust valve plate,
It is lower dead center close to rear baffle.
Based on principles above, the reciprocating compressor stroke anticollision control method of the present embodiment comprises the following steps：
The coil-induced counter electromotive force of S1, collection；
S2, by the counter electromotive force carry out zero passage detection, be judged as piston when counter electromotive force is from high level saltus step into low level
Operation, when counter electromotive force is from low transition into high level, is judged as that piston is run to lower dead center to top dead centre；
S3, secondary derivation is carried out to back emf curve, obtain secondary derivation value, when being judged as that piston is run to top dead centre,
Compare the absolute value of current secondary derivation value and threshold value t1 size, if the absolute value of current secondary derivation value is more than threshold value t1,
Then being run in next piston from lower dead center to top dead centre direction reduces the power being applied on the coil in stroke, until full
The absolute value of the secondary derivation value of foot is not more than threshold value t1, wherein, t1 ＞ 0.
The master chip control module of press, can be anti-electronic caused by collect and process machine in real time by zero passage sample circuit
Gesture.When the compressor is operated mover 5 with piston 3 the motion compresses refrigerant in cylinder 4, when compressor stroke it is smaller not up to
When hitting exhaust valve plate 6, now pressure can increase in cylinder 4, and the resistance that mover 5 is subject to can increase, because refrigerant is to press
Contracting gas, the speed of mover 5 uniformly reduce.Thus counter electromotive force also uniformly declines caused by coil 1, so the caused slope of curve
It is basically unchanged, carrying out a derivation to curve, carrying out secondary derivation again is approximately equal to zero afterwards, as shown in Figure 3.
Therefore, in step S2, judge that the method that piston is run to top dead centre or lower dead center is：Back emf curve is pressed
Fixed frequency carries out secondary derivation, if secondary derivation value is 0, illustrates that the speed of mover 5 uniformly reduces.Thus caused by coil 1
Counter electromotive force also uniformly declines, so the caused slope of curve is basically unchanged, curve is carried out to carry out two again after a derivation
Secondary derivation is approximately equal to zero, and back emf curve is curve shown in Fig. 3, therefore, when detecting back electromotive force zero-crossing
Judge which end piston is run to, namely be judged as that piston operation is supreme when counter electromotive force is from high level saltus step into low level
Stop, when counter electromotive force is from low transition into high level, it is judged as that piston is run to lower dead center；
When compressor stroke is larger, mover 5 can hit exhaust valve plate 6, and during shock, the speed of mover 5 is deposited more before this
In significant change, so concavo-convex curve can be formed in the local counter electromotive force close to zero crossing, as shown in Figure 4.By soft
Part carries out carrying out secondary derivation again after a derivation to concavo-convex curve shown in Fig. 4, can obtain the two of concave function curve
Secondary derivation value is on the occasion of the secondary derivation value of convex functional curves is negative value.Monitor that this change occurs for back emf curve so as to work as
During change, namely during the positive and negative saltus step of generation of secondary derivation value, piston is judged close to exhaust valve plate 6, if now control software detects
Concavo-convex back emf curve near zero-crossing point be present, it is believed that piston 3 reaches exhaust valve plate 6.
If secondary derivation value is not 0, back emf curve is as shown in figure 4, now only with detecting that zero crossing can't
Illustrate that piston is now run to exhaust valve plate 6, namely operation is to top dead centre, it is necessary to meet two conditions：Meet simultaneously anti-electronic
Gesture is from high level saltus step into low level, and secondary derivation value when saltus step is into negative value from being judged as that piston operation is supreme only
Point；And
Meet counter electromotive force simultaneously from low transition into high level, and secondary derivation value from negative value saltus step on the occasion of when judge
Run for piston to top dead centre.
The reciprocating compressor stroke anticollision control method of the present embodiment, first, without separately setting displacement inside compressor
The device such as sensor or sensor coil, but the counter electromotive force that the coil carried by collect and process machine is sensed, will anti-electricity
Dynamic formula carries out the mode of software processing analysis and zero passage detection, judges the current running position of piston, on the one hand saves
The cost of the detection device such as installation displacement transducer and space at present, reduce the cost and volume of linear compressor body；It is another
Aspect control software can the low and high level according to caused by zero crossing circuitry judge that compressor has been run to close to exhaust valve plate one at present
End is also proximate to rear baffle one end, prevents piston slap exhaust valve plate, furthermore, can by analyzing back emf curve
To judge the intensity of piston slap exhaust valve plate, adaptive adjustment is applied to the power on the coil, fundamentally solves
To the Impact Problems of valve block, at the same ensure that piston rod can the valve block that arrives at valve block top is opened.
As a preferred embodiment, in step S3, reduce be applied to the power on the coil when, should not be significantly
Degree reduction, prevents power from declining to a great extent and causing piston can not run to exhaust valve plate causes exhaust valve plate not opened, this implementation
Example in preferably according to（2%~5%）* P step-length reduces, and wherein P is the initial power being applied on the coil.
It was previously noted, when compressor stroke is smaller not up to hits exhaust valve plate 6, now pressure can increase in cylinder 4
Greatly, the resistance that mover 5 is subject to can increase, and because refrigerant is compressible gas, the speed of mover 5 uniformly reduces.Thus coil 1 produces
Raw counter electromotive force also uniformly declines, so the caused slope of curve is basically unchanged, curve is carried out after a derivation again to enter
The secondary derivation of row is approximately equal to zero, and this is situation about belonging under more satisfactory state, if secondary derivation value is not zero, illustrates compressor
Mover 5 can hit exhaust valve plate 6 when stroke is larger, and during shock, the speed of mover 5 has significant change more before this,
So can form concavo-convex curve in the local counter electromotive force close to zero crossing, concavo-convex curve radian is bigger, and explanation is hit
Hit more serious, the absolute value of corresponding secondary derivation value is bigger, therefore, by the absolute value of secondary derivation value and setting in the present embodiment
Threshold value compares, if the absolute value of secondary derivation value is more than threshold value t1, in next piston from lower dead center to top dead centre direction
The power being applied on the coil is reduced in operation stroke, then proceedes to calculate secondary derivation value, if secondary derivation value is exhausted
To value still above threshold value t1, then continue to run to reduce in stroke from lower dead center to top dead centre direction in next piston to be applied to
Power on the coil, until meet that the absolute value of secondary derivation value is not more than threshold value t1, after the regulation of several strokes,
Now the absolute value of secondary derivation value is close to zero, namely hits the degree minimum of exhaust valve plate, protects exhaust valve plate, simultaneously
Disclosure satisfy that can open drain tap.
Because compressor is to be utilized as coil 1 and be passed through to produce the principle of alternating magnetic field after alternating current, in step s3, drop
The mode of the low power being applied on the coil is to reduce the voltage being applied on the coil, is applied on the coil
Power is reduced accordingly.
Embodiment two
The present embodiment proposes a kind of reciprocating compressor, as shown in figure 1, including housing 7, cylinder 4, mover 5 and the mover
5 pistons 3 fixed, the coil 1 being fixed on housing 7, the permanent magnet 2 being fixed on mover 5 and control circuit, such as Fig. 5 institutes
Show, control circuit includes master chip control module, press drive module, zero cross detection circuit, counter electromotive force Acquisition Circuit, coil
Both ends be connected respectively with press drive module, zero cross detection circuit, counter electromotive force Acquisition Circuit, reciprocating compressor use with
Down stroke anticollision control method：
S1, counter electromotive force Acquisition Circuit gather coil-induced counter electromotive force and sent to master chip control module；
Counter electromotive force is carried out zero passage detection by S2, zero cross detection circuit, is sentenced when counter electromotive force is from high level saltus step into low level
Break and run for piston to top dead centre, when counter electromotive force is from low transition into high level, be judged as that piston is run to lower dead center；
S3, master chip control module carry out secondary derivation to back emf curve, obtain secondary derivation value, when being judged as that piston transports
When row is to top dead centre, compare the absolute value of current secondary derivation value and threshold value t1 size, if current secondary derivation value is absolute
Value is more than threshold value t1, then is run in stroke from lower dead center to top dead centre direction in next piston, dropped by press drive module
The low power being applied on coil, until meet that the absolute value of secondary derivation value is not more than threshold value t1, wherein, t1 ＞ 0.
, simply will control electricity without separately setting the devices such as displacement transducer or sensor coil inside the compressor of the present embodiment
Road and control method are improved, and the counter electromotive force that the coil carried by collect and process machine is sensed, anti-electrodynamic type are carried out
Software processing is analyzed and the mode of zero passage detection, judges the current running position of piston, has on the one hand saved current installation
The cost of the detection device such as displacement transducer and space, reduce the cost and volume of linear compressor body；On the other hand control
Software can the low and high level according to caused by zero crossing circuitry judge compressor to run at present close to exhaust valve plate one end still to lean on
Nearly rear baffle one end, prevents piston slap exhaust valve plate, furthermore, by analyzing back emf curve, it can be determined that go out
The intensity of piston slap exhaust valve plate, adaptive adjustment are applied to the power on the coil, fundamentally solved to valve block
Impact Problems, while ensure that piston rod can arrive at valve block and open valve block top.
In step S2, judge that the method that piston is run to top dead centre or lower dead center is：To back emf curve by fixation
Frequency carries out secondary derivation, if secondary derivation value is 0, is judged as piston when counter electromotive force is from high level saltus step into low level
Operation, when counter electromotive force is from low transition into high level, is judged as that piston is run to lower dead center to top dead centre；
If secondary derivation value is not 0, while meets counter electromotive force from high level saltus step into low level, and secondary derivation value is from just
It is judged as that piston is run to top dead centre when value saltus step is into negative value；And
Meet counter electromotive force simultaneously from low transition into high level, and secondary derivation value from negative value saltus step on the occasion of when judge
Run for piston to top dead centre.
In step S3, when reduction is applied to the power on the coil, according to（2%~5%）* P step-length reduces, wherein
P is the initial power being applied on the coil.
In step S3, the mode for reducing the power being applied on the coil is to reduce the electricity being applied on the coil
Pressure.The advantages of this part and good effect are recorded in detail in embodiment one, will not be described here.
It should be noted that the reciprocating compressor of the present embodiment can apply to the refrigeration plants such as refrigerator, air-conditioning, air
In regulation technology field, when applying in specific electric equipment products, master chip control module passes through communication module and electrical equipment master control
Module is communicated.
Certainly, described above is not limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the those of ordinary skill in domain is made in the essential scope of the present invention, should also belong to this hair
Bright protection domain.
Claims (9)
1. a kind of reciprocating compressor stroke anticollision control method, it is characterised in that comprise the following steps：
（1）, the coil-induced counter electromotive force of collection；
（2）, by the counter electromotive force carry out zero passage detection, be judged as piston when counter electromotive force is from high level saltus step into low level
Operation, when counter electromotive force is from low transition into high level, is judged as that piston is run to lower dead center to top dead centre；
（3）, secondary derivation is carried out to back emf curve, obtain secondary derivation value, when being judged as that piston is run to top dead centre,
Compare the absolute value of current secondary derivation value and threshold value t1 size, if the absolute value of current secondary derivation value is more than threshold value t1,
Then being run in next piston from lower dead center to top dead centre direction reduces the power being applied on the coil in stroke, until full
The absolute value of the secondary derivation value of foot is not more than threshold value t1, wherein, t1 ＞ 0.
2. reciprocating compressor stroke anticollision control method according to claim 1, it is characterised in that step（2）In, sentence
The method that disconnected piston is run to top dead centre or lower dead center is：Secondary derivation is carried out by fixed frequency to back emf curve, if
Secondary derivation value is 0, then is judged as that piston is run to top dead centre when counter electromotive force is from high level saltus step into low level, when anti-electricity
When kinetic potential is from low transition into high level, it is judged as that piston is run to lower dead center；
If secondary derivation value is not 0, while meets counter electromotive force from high level saltus step into low level, and secondary derivation value is from just
It is judged as that piston is run to top dead centre when value saltus step is into negative value；And
Meet counter electromotive force simultaneously from low transition into high level, and secondary derivation value from negative value saltus step on the occasion of when judge
Run for piston to top dead centre.
3. reciprocating compressor stroke anticollision control method according to claim 1 or 2, it is characterised in that step（3）
In, when reduction is applied to the power on the coil, according to（2%~5%）* P step-length reduces, and wherein P is described to be applied to
Initial power on coil.
4. reciprocating compressor stroke anticollision control method according to claim 1 or 2, it is characterised in that step（3）
In, the mode for reducing the power being applied on the coil is to reduce the voltage being applied on the coil.
5. a kind of reciprocating compressor, including housing, cylinder, mover, the piston fixed with the mover, it is fixed on housing
Coil, the permanent magnet being fixed on the mover and control circuit, it is characterised in that the control circuit includes master chip control
Molding block, press drive module, zero cross detection circuit, counter electromotive force Acquisition Circuit, the both ends of the coil respectively with the pressure
Machine drive module, zero cross detection circuit, the connection of counter electromotive force Acquisition Circuit, the reciprocating compressor are used with down stroke anticollision
Control method：
（1）, counter electromotive force Acquisition Circuit gathers coil-induced counter electromotive force and sends to the master chip control module；
（2）, zero cross detection circuit the counter electromotive force is subjected to zero passage detection, when counter electromotive force is from high level saltus step into low level
When be judged as that piston is run to top dead centre, when counter electromotive force is from low transition into high level, be judged as that piston is run under
Stop；
（3）, the master chip control module secondary derivation is carried out to back emf curve, secondary derivation value is obtained, when being judged as
When piston is run to top dead centre, compare the absolute value of current secondary derivation value and threshold value t1 size, if current secondary derivation value
Absolute value be more than threshold value t1, then next piston from lower dead center to top dead centre direction run stroke in, driven by press
Module reduces the power being applied on the coil, until meet that the absolute value of secondary derivation value is not more than threshold value t1, wherein, t1
＞ 0.
6. reciprocating compressor according to claim 5, it is characterised in that step（2）In, judge that piston operation is supreme only
Put or the method for lower dead center is：Secondary derivation is carried out by fixed frequency to back emf curve, if secondary derivation value is 0,
It is judged as that piston is run to top dead centre when counter electromotive force is from high level saltus step into low level, when counter electromotive force is from low transition
During into high level, it is judged as that piston is run to lower dead center；
If secondary derivation value is not 0, while meets counter electromotive force from high level saltus step into low level, and secondary derivation value is from just
It is judged as that piston is run to top dead centre when value saltus step is into negative value；And
Meet counter electromotive force simultaneously from low transition into high level, and secondary derivation value from negative value saltus step on the occasion of when judge
Run for piston to top dead centre.
7. the reciprocating compressor according to claim 5 or 6, it is characterised in that step（3）In, it is applied to institute in reduction
When stating the power on coil, according to（2%~5%）* P step-length reduces, and wherein P is the initial power being applied on the coil.
8. the reciprocating compressor according to claim 5 or 6, it is characterised in that step（3）In, reduction is applied to described
The mode of power on coil is to reduce the voltage being applied on the coil.
9. a kind of refrigerator, it is characterised in that including the reciprocating compressor described in claim any one of 5-8.
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| CN112746948A (en) * | 2019-10-31 | 2021-05-04 | 青岛海尔智能技术研发有限公司 | Method and device for controlling a DC linear compressor, DC linear compressor |
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