CN107762819B - A kind of control system and method for the operation of Linearkompressor varying capacity - Google Patents
A kind of control system and method for the operation of Linearkompressor varying capacity Download PDFInfo
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- CN107762819B CN107762819B CN201711096702.4A CN201711096702A CN107762819B CN 107762819 B CN107762819 B CN 107762819B CN 201711096702 A CN201711096702 A CN 201711096702A CN 107762819 B CN107762819 B CN 107762819B
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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
- F04B49/065—Control using electricity and making use of computers
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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
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
-
- 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
- F04B49/12—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 by varying the length of stroke of the working members
-
- 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
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- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Control Of Positive-Displacement Pumps (AREA)
Abstract
The invention discloses the control systems and method of a kind of operation of Linearkompressor varying capacity, including the sampling of voltage signal sampling, current signal, signal filter, isolation amplification, A/D conversion, cpu data processing unit, output interface, export the circuit modules such as isolation, power drive, temperature sensor interface and communication interface.The present invention realizes the operation of Linearkompressor varying capacity by changing the stroke of piston.The wild effects such as jump or shake that linear compressor is likely to occur in the process of running, the generation of wild effect is judged according to the fluctuation size of piston stroke, takes effective control measure in real time, avoids the damage of compressor body.Adjusting can be optimized to the power supply parameter of Linearkompressor according to the variation of external operating condition or load, realize that Linearkompressor can efficient operation under different operating conditions or loading condiction.
Description
Technical field
The invention belongs to electronic technology fields, are related to the control system and method for a kind of Linearkompressor varying capacity operation.
Background technique
The Linearkompressor driven using linear motor, since electromagnetic driving force direction exists with the direction of motion of piston always
On same straight line, reduce movement conversion mechanism, reduce friction power loss and the abrasion of piston, can greatly improve linear pressure
The mechanical efficiency of contracting machine, prolongs the service life, and realizes oil-free lubrication, can also realize varying capacity tune by regulating piston stroke
Section.Different from the piston linear compressor of traditional rotating electric machine driving, the free piston structure of Linearkompressor is moving it
There is the unfixed characteristic in upper and lower dead point in the process, with the change of piston stroke and pressure at expulsion, mechanical-electric coupling performance meeting
It is affected to some extent.
In the prior art, it is badly in need of the control system and method for a kind of Linearkompressor varying capacity operation.
Summary of the invention
The purpose of the present invention is to provide the control systems and method of a kind of operation of Linearkompressor varying capacity.To linear pressure
The real-time measurement of contracting machine voltage, electric current, frequency signal in refrigerating operaton on refrigerator is obtained using from sensing stroke detection technology
Linear compressor piston stroke data out, the stroke by changing piston realize the operation of Linearkompressor varying capacity.By cpu data
Processing unit generates SPWM signal, obtains amplitude and the adjustable control voltage Uout of frequency and frequency of supply through drive module
Fout is exported to Linearkompressor, and control strategy realizes high-precision climb displacement, and linear compressor is in the process of running
The wild effects such as the jump or shake that are likely to occur judge the generation of wild effect according to the fluctuation size of piston stroke,
Effective control measure are taken in real time, avoid the damage of Linearkompressor ontology.It can be right according to the variation of external operating condition or load
The power supply parameter of Linearkompressor optimizes adjusting, realizes that Linearkompressor can be efficiently under different operating conditions or loading condiction
Operation.
Itself the specific technical proposal is:
A kind of control system of Linearkompressor varying capacity operation, including the sampling of voltage signal sampling, current signal, signal
Filtering, isolation amplification, A/D conversion, cpu data processing unit, output interface, output isolation, power drive, temperature sensor connect
The circuit modules such as mouth and communication interface；
Real-time electricity of the voltage signal sampling by resistor voltage divider circuit realization, when Linearkompressor is run on stator coil
Pressure value u (t) is converted to the voltage signal of 0~3V to adapt to the required magnitude of A/D conversion；Current signal sampling uses Hall current
Sensors A CS712, the real-time current value i (t) when Linearkompressor is run are converted to the voltage signal of 0~3V to adapt to A/D
Magnitude needed for conversion；Signal has been carried out to real-time voltage value u (t), real-time current value i (t) respectively before A/D conversion circuit
Filtering and isolation enhanced processing, signal filtering are filtered out using the bandpass filter of operational amplifier TL082 composition 40Hz~70Hz
Harmonic interference signals other than Linearkompressor working frequency, isolation amplification is by linear optical coupling HCNR201 and operational amplifier
TL082 composition, forceful electric power signal when Linearkompressor is worked are isolated with cpu data processing unit, inhibit interference signal
Influence to cpu data processing unit；Cpu data processing unit uses mixed signal processing single chip C8051F020, utilizes this
12 mixed signal processing single chip C8051F020 included high-speed a/d converters are real-time voltage value u (t), real-time current value
I (t) is converted to digital signal；Condensation temperature tc, evaporating temperature te, suction temperature ts and exhaust temperature when Linearkompressor works
It spends td to acquire by digital temperature sensor DS18B20, cpu data processing unit reads above 4 tunnels by input interface circuit
Temperature value；Communication interface realizes the conversion of RS232 and Transistor-Transistor Logic level using MAX232 chip, from the received electric ice of refrigerator controller
Case temperature of refrigerating chamber T and set temperature value Ts, while the running state data of Linearkompressor is passed back to refrigerator controller.
Cpu data processing unit read respectively voltage signal, current signal through A/D convert as a result, and by data
It is stored in data storage after reason, the data of caching are greater than a complete signal period；The voltage signal values of storage are carried out
Zero-cross comparator differentiates, finds out signal period value, the real-time frequency value f when inverse of the periodic quantity is Linearkompressor operation；
Real-time voltage value u (t), reality when implementation method from sensing stroke detection technology is the Linearkompressor operation obtained by sampling
When current value i (t) and Linearkompressor classical insulation K0, Re, Le, K0For the electricity of Linearkompressor stator coil winding
Magnetic force coefficient, Re are the equivalent resistance of coil windings, and Le is the equivalent inductance value of coil windings, and displacement calculation formula isLinearkompressor piston stroke value x is found out according to displacement calculation formula；
Cpu data processing unit determines the operating condition of Linearkompressor according to piston stroke and the temperature value received, from output
Interface issues the SPWM signal of control Linearkompressor operation in real time, obtains amplitude through power driving circuit module and frequency is adjustable
The control voltage Uout and frequency of supply fout of section are exported to Linearkompressor, and linear compressor in the process of running may
The wild effects such as the jump or shake of appearance take corresponding safeguard measure, avoid the damage of Linearkompressor ontology, simultaneously
Adjusting is optimized according to SPWM signal of the variation of external operating condition or load to output, realizes the varying capacity fortune of Linearkompressor
Row control.
A kind of control method of Linearkompressor varying capacity operation, includes the following steps:
Step 1. reads RS232 serial data and obtains the refrigerator storage room temperature T and setting temperature that refrigerator controller is sent
Angle value Ts, while the running state data of Linearkompressor is passed back to refrigerator controller；
Step 2. determines linear compression according to refrigerator storage room temperature T obtained in step 1 and set temperature value Ts
The working condition of machine: as (T >=Ts+1) DEG C, temperature value reaches the upper limit value of control target, starting Linearkompressor operation；(T
≤ Ts-1) DEG C when, temperature value reach control target lower limit value, stop Linearkompressor operation；Further, cold according to refrigerator
The difference of hiding room temperature T and set temperature value Ts carries out the varying capacity operation of control Linearkompressor, improves the efficiency of refrigerator
Than.
Step 3. starts Linearkompressor operation.It is adjusted during startup for the even running for guaranteeing Linearkompressor
SPWM output signal becomes larger piston stroke, after reaching operating condition, then maintains piston stroke attached in upper dead center position
Nearly operation；
Voltage signal when step 4. Linearkompressor is run is put by pressure sampling circuit, signal filter circuit, isolation
Big circuit, A/D conversion circuit are sent into cpu data processing unit, and cpu data processing unit reads what voltage signal was converted through A/D
As a result, simultaneously obtaining the real-time voltage value u (t) when Linearkompressor operation after data processing；
Current signal when step 5. Linearkompressor is run is by Hall current sensor sample circuit, signal isolation electricity
Road, A/D conversion circuit be sent into cpu data processing unit, cpu data processing unit read current signal through A/D convert as a result,
And the real-time current value i (t) when Linearkompressor operation is obtained after data processing；
Step 6.CPU data processing unit carries out Zero-cross comparator differentiation to the voltage signal for sampling and storing in step 4, asks
Signal period value out, the real-time frequency value f when inverse of the periodic quantity is Linearkompressor operation；
Step 7. Linearkompressor according to obtained in step 4 and step 5 run when real-time voltage value u (t) and in real time
Current value i (t) calculates Linearkompressor piston stroke value x according to formula (1).K in formula0For Linearkompressor stator coil
The electromagnetism force coefficient of winding, Re are the equivalent resistance of coil windings, and Le is the equivalent inductance value of coil windings, these three parameters
Determined by the electrical characteristic of Linearkompressor, can be determined by the method for experiment come, linear compression mechanism make after the completion of,
K0, Re, Le be constant, t is time variable, and T is time constant.
Step 8. is learnt that Linearkompressor is when different real-time frequency value f are run, calculated work in step 7 by test
Stroke value x is filled in there are nonlinearity erron, for the required precision for guaranteeing piston stroke value x, according to real-time frequency obtained in step 6
Value f carries out piece-wise linearization to calculated piston stroke value x and handles to obtain piston traveled distance value x '；
Step 9. Linearkompressor according to obtained in step 4 and step 5 run when real-time voltage value u (t) and in real time
Current value i (t) calculates input power Pi when Linearkompressor operation according to formula (2), and in formula (2), t is to become the time
Amount, T is time constant.
It is learnt by test, input power Pi and piston traveled distance value x ' is directly proportional when Linearkompressor is run, upper dead
Point position piston stroke reaches maximum value Xs, and input power Pi at this time also reaches input power maximum value Pis, in control plan
In slightly when piston traveled distance value x ' reaches the maximum value Xs of upper dead center position piston stroke, input power at this time is recorded
Maximum value Pis；Input power Pi when realizing the operation of linear adjustment compressor by regulating piston traveled distance value x ', therefore pass through
The stroke of piston is achieved that the varying capacity operation of Linearkompressor when changing Linearkompressor operation.
The structure design of step 10. Linearkompressor determines natural frequency value ω when its operation, is asked according to formula (3)
Out.Ks is spring rate in formula, and kg is gas equivalent stiffness, and m1 is mover quality, and m2 is fuselage quality.
It is learnt according to formula (1), the piston stroke value x and real-time voltage value u (t) when Linearkompressor is run are directly proportional；
Real-time frequency value f when Linearkompressor is run is closer to natural frequency value ω, and the variation delta u of real-time voltage value u (t) is to work
The influence for filling in traveled distance value x ' is bigger, and the refrigerating capacity under unit input power is also bigger, and the efficiency of Linearkompressor is higher.
Step 11. is according to piston traveled distance value x ' obtained in step 8, not according to the judgement of the fluctuation size of piston stroke
When stabilization occurs, taking reduces frequency of supply fout, increases control voltage Uout, so that input power Pi keeps current value
It is constant, wild effect is eliminated, the damage of Linearkompressor ontology is avoided.
Condensation temperature tc, evaporation when step 12. acquires linear compressor operating using digital temperature sensor DS18B20
Temperature te, suction temperature ts, delivery temperature td, and pressure of inspiration(Pi) is obtained according to temperature in refrigeration system and pressure conversion relationship
Ps, pressure at expulsion pd；The variation range Ω in different operating condition lower linear suction pressure of compressor values is obtained by test method
The variation range Ω { pd } of { ps }, exhaust pressure value, when realizing that Linearkompressor is run under corresponding operating condition by control strategy
Ps ∈ Ω { ps }, pd ∈ Ω { pd } realize that Linearkompressor can efficient operation under different operating conditions.
The size of input power is real when the operation of step 13. Linearkompressor varying capacity is run by linear adjustment compressor
Existing, cpu data processing unit generates SPWM signal, obtains amplitude and frequency through signal isolation circuit, IGBT power driving circuit
Adjustable control voltage Uout and frequency of supply fout is exported to Linearkompressor, according to intrinsic frequency obtained in step 10
Value ω adjusts output frequency of supply fout and existsOperation nearby；According to realtime power value Pi obtained in step 9, output is adjusted
Voltage Uout is controlled, for control Linearkompressor when full load is run, Pi ∈ (1 ± 1%) × Pis realizes Linearkompressor
High-efficiency operation improves the Energy Efficiency Ratio of refrigerator, saves electric energy.
Linearkompressor needs the difference according to refrigerator storage room temperature and set temperature in refrigerating operaton on refrigerator
It is worth the size for determining Linearkompressor input power, with the accurate control for guaranteeing refrigerator temperature and the efficiency for improving refrigerator
Than realizing the purpose for saving electric energy.According to refrigerator storage room temperature T and set temperature value Ts obtained in step 1, according to two
The temperature gap of person carries out varying capacity operation, according to realtime power value Pi obtained in step 9, joins to the power supply of Linearkompressor
Number optimizes adjusting.
Further, in step 13, adjusting is optimized to the power supply parameter of Linearkompressor, specific as follows:
When temperature gap is greater than 15 DEG C, full load operation controls Pi ∈ (1 ± 1%) × Pis；
When temperature difference is between 10 DEG C~15 DEG C, 75% load operation controls Pi ∈ (1 ± 1%) × 75% × Pis；
When temperature difference is between 5 DEG C~10 DEG C, 50% load operation controls Pi ∈ (1 ± 1%) × 50% × Pis；
When temperature difference is between 1 DEG C~5 DEG C, 25% load operation controls Pi ∈ (1 ± 1%) × 25% × Pis；
When temperature difference is between 0 DEG C~1 DEG C, reach target temperature, Linearkompressor is shut down.
Compared with prior art, the invention has the benefit that
The present invention adopts the real-time measurement of Linearkompressor voltage, electric current, frequency signal in refrigerating operaton on refrigerator
Linearkompressor piston stroke data are obtained with from sensing stroke detection technology, and the stroke by changing piston realizes linear compression
The operation of machine varying capacity.SPWM signal is generated by main control module, obtains amplitude and the adjustable control voltage of frequency through drive module
Uout and frequency of supply fout is exported to Linearkompressor, and control strategy realizes high-precision climb displacement, linear compression
The wild effects such as jump or shake that machine is likely to occur in the process of running judge unstable according to the fluctuation size of piston stroke
Determine the generation of phenomenon, take effective control measure in real time, avoids the damage of Linearkompressor ontology.According to external operating condition or bear
The variation of lotus can optimize adjusting to the power supply parameter of Linearkompressor, realize Linearkompressor in different operating conditions or load item
It can efficient operation under part.
Detailed description of the invention
Fig. 1 is the schematic diagram of the control system of Linearkompressor varying capacity operation；
Fig. 2 is the control method flow chart of Linearkompressor varying capacity operation.
Specific embodiment
Technical solution of the present invention is described in more detail in the following with reference to the drawings and specific embodiments.
As shown in Figure 1, a kind of control system of Linearkompressor varying capacity operation, which includes that voltage signal is adopted
Sample, current signal sampling, signal filtering, isolation amplification, A/D conversion, cpu data processing unit, output interface, export be isolated,
The circuit modules such as power drive, temperature sensor interface and communication interface.Voltage signal sampling by resistor voltage divider circuit realize,
Real-time voltage value u (t) when Linearkompressor is run on stator coil is converted to the voltage signal of 0~3V to adapt to A/D and turn
Change required magnitude；Current signal sampling uses Hall current sensor ACS712, real-time electricity when Linearkompressor is run
Flow valuve i (t) is converted to the voltage signal of 0~3V to adapt to the required magnitude of A/D conversion；For improve system measurement accuracy and can
By property, signal filtering and isolation have been carried out to real-time voltage value u (t), real-time current value i (t) respectively before A/D conversion circuit
Enhanced processing, signal filtering filter out Linearkompressor using the bandpass filter of operational amplifier TL082 composition 40Hz~70Hz
Harmonic interference signals other than working frequency, isolation amplification are made of linear optical coupling HCNR201 and operational amplifier TL082, will
Forceful electric power signal when Linearkompressor works is isolated with cpu data processing unit, inhibits interference signal to cpu data processing
The influence of unit improves the reliability of system；Cpu data processing unit uses mixed signal processing single chip C8051F020, benefit
12 high-speed a/d converters carried with the mixed signal processing single chip C8051F020 are real-time voltage value u (t), in real time electricity
Flow valuve i (t) is converted to digital signal, that is, simplifies circuit structure and saved system cost again；Condensation when Linearkompressor works
Temperature tc, evaporating temperature te, suction temperature ts and delivery temperature td are acquired by digital temperature sensor DS18B20, cpu data
Processing unit reads the above 4 road temperature values by input interface circuit；Communication interface using MAX232 chip realize RS232 with
The conversion of Transistor-Transistor Logic level from refrigerator controller received refrigerator storage room temperature T and set temperature value Ts, while will be pressed linearly
The running state data of contracting machine is passed back to refrigerator controller.
Cpu data processing unit read respectively voltage signal, current signal through A/D convert as a result, and by data
It is stored in data storage after reason, the data of caching are greater than a complete signal period；The voltage signal values of storage are carried out
Zero-cross comparator differentiates, finds out signal period value, the real-time frequency value f when inverse of the periodic quantity is Linearkompressor operation；
Real-time voltage value u (t), reality when implementation method from sensing stroke detection technology is the Linearkompressor operation obtained by sampling
When current value i (t) and Linearkompressor classical insulation K0, Re, Le, K0For the electricity of Linearkompressor stator coil winding
Magnetic force coefficient, Re are the equivalent resistance of coil windings, and Le is the equivalent inductance value of coil windings, and displacement calculation formula isLinearkompressor piston stroke value x is found out according to displacement calculation formula；
Cpu data processing unit determines the operating condition of Linearkompressor according to piston stroke and the temperature value received, from output
Interface issues the SPWM signal of control Linearkompressor operation in real time, obtains amplitude through power driving circuit module and frequency is adjustable
The control voltage Uout and frequency of supply fout of section are exported to Linearkompressor, and linear compressor in the process of running may
The wild effects such as the jump or shake of appearance take corresponding safeguard measure, avoid the damage of Linearkompressor ontology.Simultaneously
Adjusting is optimized according to SPWM signal of the variation of external operating condition or load to output, realizes the varying capacity fortune of Linearkompressor
Row control.
Referring to Fig. 2, a kind of control method of Linearkompressor varying capacity operation includes the following steps:
Step 1. reads RS232 serial data and obtains the refrigerator storage room temperature T and setting temperature that refrigerator controller is sent
Angle value Ts, while the running state data of Linearkompressor is passed back to refrigerator controller；
Step 2. determines linear compression according to refrigerator storage room temperature T obtained in step 1 and set temperature value Ts
The working condition of machine: as (T >=Ts+1) DEG C, temperature value reaches the upper limit value of control target, starting Linearkompressor operation；(T
≤ Ts-1) DEG C when, temperature value reach control target lower limit value, stop Linearkompressor operation；Further, cold according to refrigerator
The difference of hiding room temperature T and set temperature value Ts carries out the varying capacity operation of control Linearkompressor, improves the efficiency of refrigerator
Than.
Step 3. starts Linearkompressor operation.It is adjusted during startup for the even running for guaranteeing Linearkompressor
SPWM output signal becomes larger piston stroke, after reaching operating condition, then maintains piston stroke attached in upper dead center position
Nearly operation；
Voltage signal when step 4. Linearkompressor is run is put by pressure sampling circuit, signal filter circuit, isolation
Big circuit, A/D conversion circuit are sent into cpu data processing unit, and cpu data processing unit reads what voltage signal was converted through A/D
As a result, simultaneously obtaining the real-time voltage value u (t) when Linearkompressor operation after data processing；
Current signal when step 5. Linearkompressor is run is by Hall current sensor sample circuit, signal isolation electricity
Road, A/D conversion circuit be sent into cpu data processing unit, cpu data processing unit read current signal through A/D convert as a result,
And the real-time current value i (t) when Linearkompressor operation is obtained after data processing；
Step 6.CPU data processing unit carries out Zero-cross comparator differentiation to the voltage signal for sampling and storing in step 4, asks
Signal period value out, the real-time frequency value f when inverse of the periodic quantity is Linearkompressor operation；
Step 7. Linearkompressor according to obtained in step 4 and step 5 run when real-time voltage value u (t) and in real time
Current value i (t) calculates Linearkompressor piston stroke value x according to formula (1).K in formula0For Linearkompressor stator coil
The electromagnetism force coefficient of winding, Re are the equivalent resistance of coil windings, and Le is the equivalent inductance value of coil windings, these three parameters
Determined by the electrical characteristic of Linearkompressor, can be determined by the method for experiment come, linear compression mechanism make after the completion of,
K0, Re, Le be constant, t is time variable, and T is time constant.
Step 8. is learnt that Linearkompressor is when different real-time frequency value f are run, calculated work in step 7 by test
Stroke value x is filled in there are nonlinearity erron, for the required precision for guaranteeing piston stroke value x, according to real-time frequency obtained in step 6
Value f carries out piece-wise linearization to calculated piston stroke value x and handles to obtain piston traveled distance value x '；
Step 9. Linearkompressor according to obtained in step 4 and step 5 run when real-time voltage value u (t) and in real time
Current value i (t) calculates input power Pi when Linearkompressor operation according to formula (2), and in formula (2), t is to become the time
Amount, T is time constant.
It is learnt by test, input power Pi and piston traveled distance value x ' is directly proportional when Linearkompressor is run, upper dead
Point position piston stroke reaches maximum value Xs, and input power Pi at this time also reaches input power maximum value Pis, in control plan
In slightly when piston traveled distance value x ' reaches the maximum value Xs of upper dead center position piston stroke, input power at this time is recorded
Maximum value Pis；Input power Pi when realizing the operation of linear adjustment compressor by regulating piston traveled distance value x ', therefore pass through
The stroke of piston is achieved that the varying capacity operation of Linearkompressor when changing Linearkompressor operation.
The structure design of step 10. Linearkompressor determines natural frequency value ω when its operation, is asked according to formula (3)
Out.Ks is spring rate in formula, and kg is gas equivalent stiffness, and m1 is mover quality, and m2 is fuselage quality.
It is learnt according to formula (1), the piston stroke value x and real-time voltage value u (t) when Linearkompressor is run are directly proportional；
Real-time frequency value f when Linearkompressor is run is closer to natural frequency value ω, and the variation delta u of real-time voltage value u (t) is to work
The influence for filling in traveled distance value x ' is bigger, and the refrigerating capacity under unit input power is also bigger, and the efficiency of Linearkompressor is higher.
Step 11. is according to piston traveled distance value x ' obtained in step 8, not according to the judgement of the fluctuation size of piston stroke
When stabilization occurs, taking reduces frequency of supply fout, increases control voltage Uout, so that input power Pi keeps current value
It is constant, wild effect is eliminated, the damage of Linearkompressor ontology is avoided.
Condensation temperature tc, evaporation when step 12. acquires linear compressor operating using digital temperature sensor DS18B20
Temperature te, suction temperature ts, delivery temperature td, and pressure of inspiration(Pi) is obtained according to temperature in refrigeration system and pressure conversion relationship
Ps, pressure at expulsion pd；The variation range Ω in different operating condition lower linear suction pressure of compressor values is obtained by test method
The variation range Ω { pd } of { ps }, exhaust pressure value, when realizing that Linearkompressor is run under corresponding operating condition by control strategy
Ps ∈ Ω { ps }, pd ∈ Ω { pd } realize that Linearkompressor can efficient operation under different operating conditions.
The size of input power is real when the operation of step 13. Linearkompressor varying capacity is run by linear adjustment compressor
Existing, cpu data processing unit generates SPWM signal, obtains amplitude and frequency through signal isolation circuit, IGBT power driving circuit
Adjustable control voltage Uout and frequency of supply fout is exported to Linearkompressor, according to intrinsic frequency obtained in step 10
Value ω adjusts output frequency of supply fout and existsOperation nearby；According to realtime power value Pi obtained in step 9, output is adjusted
Voltage Uout is controlled, for control Linearkompressor when full load is run, Pi ∈ (1 ± 1%) × Pis realizes Linearkompressor
High-efficiency operation improves the Energy Efficiency Ratio of refrigerator, saves electric energy.
Linearkompressor needs the difference according to refrigerator storage room temperature and set temperature in refrigerating operaton on refrigerator
It is worth the size for determining Linearkompressor input power, with the accurate control for guaranteeing refrigerator temperature and the efficiency for improving refrigerator
Than realizing the purpose for saving electric energy.According to refrigerator storage room temperature T and set temperature value Ts obtained in step 1, according to two
The temperature gap of person carries out varying capacity operation, according to realtime power value Pi obtained in step 9, joins to the power supply of Linearkompressor
Number optimizes adjusting.
Further, in step 13, adjusting is optimized to the power supply parameter of Linearkompressor, specific as follows:
When temperature gap is greater than 15 DEG C, full load operation controls Pi ∈ (1 ± 1%) × Pis；
When temperature difference is between 10 DEG C~15 DEG C, 75% load operation controls Pi ∈ (1 ± 1%) × 75% × Pis；
When temperature difference is between 5 DEG C~10 DEG C, 50% load operation controls Pi ∈ (1 ± 1%) × 50% × Pis；
When temperature difference is between 1 DEG C~5 DEG C, 25% load operation controls Pi ∈ (1 ± 1%) × 25% × Pis；
When temperature difference is between 0 DEG C~1 DEG C, reach target temperature, Linearkompressor is shut down.
The foregoing is only a preferred embodiment of the present invention, the scope of protection of the present invention is not limited to this, it is any ripe
Know those skilled in the art within the technical scope of the present disclosure, the letter for the technical solution that can be become apparent to
Altered or equivalence replacement are fallen within the protection scope of the present invention.
Claims (3)
1. a kind of control system of Linearkompressor varying capacity operation, which is characterized in that including following circuits module: voltage signal
Sampling, current signal sampling, signal filtering, isolation amplification, A/D conversion, cpu data processing unit, output interface, output every
From, power drive, temperature sensor interface and communication interface；
Real-time voltage value of the voltage signal sampling by resistor voltage divider circuit realization, when Linearkompressor is run on stator coil
U (t) is converted to the voltage signal of 0~3V to adapt to the required magnitude of A/D conversion；Current signal sampling is sensed using Hall current
Device ACS712, the real-time current value i (t) when Linearkompressor is run are converted to the voltage signal of 0~3V to adapt to A/D conversion
Required magnitude；A/D conversion before respectively to real-time voltage value u (t), real-time current value i (t) carried out signal filtering and every
From enhanced processing, signal filtering filters out linear compression using the bandpass filter of operational amplifier TL082 composition 40Hz~70Hz
Harmonic interference signals other than machine working frequency, isolation amplification are made of linear optical coupling HCNR201 and operational amplifier TL082,
Forceful electric power signal when Linearkompressor is worked is isolated with cpu data processing unit, inhibit interference signal to cpu data at
Manage the influence of unit；Cpu data processing unit uses mixed signal processing single chip C8051F020, at the mixed signal
12 reason single-chip microcontroller C8051F020 included high-speed a/d converters are converted to real-time voltage value u (t), real-time current value i (t)
Digital signal；Condensation temperature tc, evaporating temperature te, suction temperature ts and delivery temperature td when Linearkompressor works pass through number
Word temperature sensor DS18B20 acquisition, cpu data processing unit read the above 4 road temperature values by input interface circuit；Communication
Interface realizes the conversion of RS232 and Transistor-Transistor Logic level using MAX232 chip, from the received refrigerator storage room temperature of refrigerator controller
T and set temperature value Ts, while the running state data of Linearkompressor is passed back to refrigerator controller；
Cpu data processing unit read respectively voltage signal, current signal through A/D convert as a result, simultaneously after data processing
It is stored in data storage, the data of caching are greater than a complete signal period；Zero passage is carried out to the voltage signal values of storage
Compare differentiation, finds out signal period value, the real-time frequency value f when inverse of the periodic quantity is Linearkompressor operation；Autobiography
Real-time voltage value u (t), real-time electricity when the implementation method of sense stroke detection technology is the Linearkompressor operation obtained by sampling
The classical insulation K of flow valuve i (t) and Linearkompressor0, Re, Le, K0For the electromagnetic force of Linearkompressor stator coil winding
Coefficient, Re are the equivalent resistance of coil windings, and Le is the equivalent inductance value of coil windings, and displacement calculation formula isLinearkompressor piston stroke value x is found out according to displacement calculation formula；For
The required precision for guaranteeing piston stroke value x carries out piece-wise linearization to calculated piston stroke value x according to real-time frequency value f
Processing obtains piston traveled distance value x '；According to piston traveled distance value x ', judged according to the fluctuation size of piston stroke unstable
When determining phenomenon generation, taking reduces frequency of supply fout, increases control voltage Uout, so that input power Pi keeps current value not
Become, to eliminate the wild effect of piston stroke；
Cpu data processing unit determines the operating condition of Linearkompressor according to piston stroke and the temperature value received, from
Output interface issues the SPWM signal of control Linearkompressor operation in real time, obtains amplitude and frequency through power driving circuit module
Adjustable control voltage Uout and frequency of supply fout is exported to Linearkompressor, according to natural frequency value ω, adjusts output
Frequency of supply fout existsOperation nearby；According to input power Pi, output control voltage Uout is adjusted, Linearkompressor is controlled
In full load operation, Pi ∈ (1 ± 1%) × Pis, the Pis are the input power maximum value of Linearkompressor；Linear
The wild effect of jump or shake that compressor is likely to occur in the process of running, which is taken, reduces frequency of supply fout, increases control
The safeguard measure of voltage Uout processed avoids the damage of Linearkompressor ontology, while according to the variation pair of external operating condition or load
The SPWM signal of output optimizes adjusting, realizes the varying capacity operation control of Linearkompressor；Linearkompressor is in refrigerator
When upper refrigerating operaton, need to determine that Linearkompressor is inputted according to the difference of refrigerator storage room temperature T and set temperature value Ts
The size of power P i；According to refrigerator storage room temperature T and set temperature value Ts, the temperature gap according to the two carries out varying capacity
Operation optimizes adjusting to the power supply parameter of Linearkompressor according to input power Pi.
2. a kind of control method of Linearkompressor varying capacity operation, which comprises the steps of:
Step 1. reads RS232 serial data and obtains the refrigerator storage room temperature T and set temperature value that refrigerator controller is sent
Ts, while the running state data of Linearkompressor is passed back to refrigerator controller；
Step 2. determines Linearkompressor according to refrigerator storage room temperature T obtained in step 1 and set temperature value Ts
Working condition: as (T >=Ts+1) DEG C, temperature value reaches the upper limit value of control target, starting Linearkompressor operation；(T≤
Ts-1) DEG C when, temperature value reaches the lower limit value of control target, stops Linearkompressor operation；Further, according to refrigerator storage
The difference of room temperature T and set temperature value Ts carry out the varying capacity operation of control Linearkompressor, improve the Energy Efficiency Ratio of refrigerator；
Step 3. starts Linearkompressor operation；SPWM is adjusted during startup for the even running for guaranteeing Linearkompressor
Output signal becomes larger piston stroke, after reaching operating condition, then piston stroke is maintained to transport near upper dead center position
Row；
Voltage signal when step 4. Linearkompressor is run is by pressure sampling circuit, signal filter circuit, isolation amplification electricity
Road, A/D conversion circuit be sent into cpu data processing unit, cpu data processing unit read voltage signal through A/D convert as a result,
And the real-time voltage value u (t) when Linearkompressor operation is obtained after data processing；
Step 5. Linearkompressor run when current signal by Hall current sensor sample circuit, signal isolation circuit,
A/D conversion circuit be sent into cpu data processing unit, cpu data processing unit read current signal through A/D convert as a result, simultaneously
The real-time current value i (t) when Linearkompressor operation is obtained after data processing；
Step 6.CPU data processing unit carries out Zero-cross comparator differentiation to the voltage signal for sampling and storing in step 4, finds out letter
Number periodic quantity, the real-time frequency value f when inverse of the periodic quantity is Linearkompressor operation；
Real-time voltage value u (t) and real-time current when step 7. Linearkompressor according to obtained in step 4 and step 5 is run
Value i (t) calculates Linearkompressor piston stroke value x according to formula (1)；K in formula0For Linearkompressor stator coil winding
Electromagnetism force coefficient, Re be coil windings equivalent resistance, Le be coil windings equivalent inductance value, these three parameters are by line
Property compressor electrical characteristic determine, by the method for experiment determine come, linear compression mechanism work after the completion of, K0、Re、Le
It is constant, t is time variable, and T is time constant；
Step 8. is learnt that Linearkompressor is when different real-time frequency value f are run, calculated piston row in step 7 by test
Journey value x is there are nonlinearity erron, for the required precision for guaranteeing piston stroke value x, according to real-time frequency value f obtained in step 6,
Piece-wise linearization is carried out to calculated piston stroke value x to handle to obtain piston traveled distance value x '；
Real-time voltage value u (t) and real-time current when step 9. Linearkompressor according to obtained in step 4 and step 5 is run
Value i (t) calculates input power Pi when Linearkompressor operation according to formula (2), and in formula (2), t is time variable, T
For time constant；
It is learnt by test, input power Pi and piston traveled distance value x ' is directly proportional when Linearkompressor is run, in top dead-centre position
It sets piston stroke and reaches maximum value Xs, and input power Pi at this time also reaches input power maximum value Pis, in control strategy
When piston traveled distance value x ' reaches the maximum value Xs of upper dead center position piston stroke, the input power recorded at this time is maximum
Value Pis；Input power Pi when realizing the operation of linear adjustment compressor by regulating piston traveled distance value x ', therefore pass through change
The stroke of piston is achieved that the varying capacity operation of Linearkompressor when Linearkompressor is run；
The structure design of step 10. Linearkompressor determines natural frequency value ω when its operation, is found out according to formula (3)；Formula
Middle ks is spring rate, and kg is gas equivalent stiffness, and m1 is mover quality, and m2 is fuselage quality；
It is learnt according to formula (1), the piston stroke value x and real-time voltage value u (t) when Linearkompressor is run are directly proportional；Linearly
Real-time frequency value f when compressor is run is closer to natural frequency value ω, and the variation delta u of real-time voltage value u (t) is to piston reality
The influence of border stroke value x ' is bigger, and the refrigerating capacity under unit input power is also bigger, and the efficiency of Linearkompressor is higher；
Step 11. judges unstable according to piston traveled distance value x ' obtained in step 8 according to the fluctuation size of piston stroke
When phenomenon occurs, taking reduces frequency of supply fout, increases control voltage Uout, so that input power Pi keeps current value not
Become, eliminates wild effect, avoid the damage of Linearkompressor ontology；
Condensation temperature tc, evaporating temperature when step 12. acquires linear compressor operating using digital temperature sensor DS18B20
Te, suction temperature ts, delivery temperature td, and pressure of inspiration(Pi) ps, row are obtained according to temperature in refrigeration system and pressure conversion relationship
Atmospheric pressure pd；Variation range Ω { ps }, the row in different operating condition lower linear suction pressure of compressor values are obtained by test method
The variation range Ω { pd } of air pressure force value, ps ∈ Ω when realizing that Linearkompressor is run under corresponding operating condition by control strategy
{ ps }, pd ∈ Ω { pd } realizes that Linearkompressor can efficient operation under different operating conditions；
The size of input power Pi is realized when the operation of step 13. Linearkompressor varying capacity is run by linear adjustment compressor,
Cpu data processing unit generates SPWM signal, and obtaining amplitude and frequency through signal isolation circuit, IGBT power driving circuit can adjust
The control voltage Uout and frequency of supply fout of section are exported to Linearkompressor, according to natural frequency value obtained in step 10
ω adjusts output frequency of supply fout and existsOperation nearby；According to input power Pi obtained in step 9, output control is adjusted
Voltage Uout, for control Linearkompressor when full load is run, Pi ∈ (1 ± 1%) × Pis realizes the efficient of Linearkompressor
Rate operation, improves the Energy Efficiency Ratio of refrigerator, saves electric energy；
Linearkompressor is needed in refrigerating operaton on refrigerator according to refrigerator storage room temperature T's and set temperature value Ts
Difference determines the size of Linearkompressor input power Pi, the accurate control to guarantee refrigerator temperature and the energy for improving refrigerator
Ratio is imitated, realizes the purpose for saving electric energy；According to refrigerator storage room temperature T and set temperature value Ts obtained in step 1, foundation
The temperature gap of the two carries out varying capacity operation, according to input power Pi obtained in step 9, joins to the power supply of Linearkompressor
Number optimizes adjusting.
3. the control method of Linearkompressor varying capacity operation according to claim 2, which is characterized in that in step 13,
Adjusting is optimized to the power supply parameter of Linearkompressor, specific as follows:
When temperature gap is greater than 15 DEG C, full load operation controls Pi ∈ (1 ± 1%) × Pis；
When temperature difference is between 10 DEG C~15 DEG C, 75% load operation controls Pi ∈ (1 ± 1%) × 75% × Pis；
When temperature difference is between 5 DEG C~10 DEG C, 50% load operation controls Pi ∈ (1 ± 1%) × 50% × Pis；
When temperature difference is between 1 DEG C~5 DEG C, 25% load operation controls Pi ∈ (1 ± 1%) × 25% × Pis；
When temperature difference is between 0 DEG C~1 DEG C, reach target temperature, Linearkompressor is shut down.
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