US20040101413A1 - Control device of linear compressor drive system - Google Patents

Control device of linear compressor drive system Download PDF

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Publication number
US20040101413A1
US20040101413A1 US10/473,116 US47311603A US2004101413A1 US 20040101413 A1 US20040101413 A1 US 20040101413A1 US 47311603 A US47311603 A US 47311603A US 2004101413 A1 US2004101413 A1 US 2004101413A1
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United States
Prior art keywords
unstableness
detecting means
piston
detection signal
detecting
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US10/473,116
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English (en)
Inventor
Ko Inagaki
Ichiro Morita
Makoto Katayama
Akira Inoue
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Panasonic Holdings Corp
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Matsushita Refrigeration Co
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Assigned to MATSUSHITA REFRIGERATION COMPANY reassignment MATSUSHITA REFRIGERATION COMPANY ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: INAGAKI, KO, INOUE, AKIRA, KATAYAMA, MAKOTO, MORITA, ICHIRO
Publication of US20040101413A1 publication Critical patent/US20040101413A1/en
Abandoned legal-status Critical Current

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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
    • F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
    • F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
    • F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
    • 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
    • F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
    • F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
    • F04B35/045—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric using solenoids
    • 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
    • F04B49/10—Other safety measures

Definitions

  • the present invention relates to a control apparatus for a linear compressor driving system used for a refrigerator, an air conditioner and the like.
  • FIG. 10 is a sectional view showing a linear compressor that is a main unit in a linear compressor driving system as a control target to be controlled in accordance with the present invention
  • FIG. 11 is a block diagram showing the configuration of the conventional control apparatus for controlling the linear compressor driving system.
  • reference numeral 1 denotes a linear compressor
  • 2 denotes a sealed casing
  • 3 denotes a compressor body
  • reference numeral 4 denotes a linear motor
  • 5 denotes a cylinder
  • 6 denotes a piston
  • 7 denotes a cylinder head.
  • the motor 4 is provided with: a stator 4 a having a coil 4 c ; and a movable element 4 b having a permanent magnet.
  • the movable element 4 b is fixed to the piston 6 .
  • reference numeral 10 denotes a compression room composed of the cylinder 5 and the piston 6 .
  • the compressor body 3 is composed of: a movable device 11 constituted by the movable element 4 b of the motor 4 and the piston 6 and the like; and a fixed device 12 constituted by the cylinder 5 and the stator 4 a of the motor 4 and the like.
  • reference numeral 14 denotes an elastic device. It is attached to the movable device at its center 14 a and attached to the fixed device.
  • reference numeral 16 denotes a power supply unit
  • 17 denotes a voltage determining means
  • 18 denotes an ambient temperature detecting means
  • Reference numeral 19 denotes a heat exchanger constituted by an evaporator 19 a and a condenser 19 b
  • 20 denotes an expansion valve.
  • the linear compressor 1 , the condenser 19 b , the expansion valve 20 and the evaporator 19 a are linked through piping, and they form a system 21 in which refrigerant is circulated.
  • the ambient temperature detecting means 18 measures an ambient temperature and outputs a temperature signal based on the temperature.
  • the voltage determining means 17 outputs a voltage target value based on the temperature signal.
  • the power supply unit 16 outputs an alternating current in a shape of a sine wave to the linear compressor 1 at a voltage corresponding to the voltage target value.
  • the alternating current outputted from the power supply unit 16 is sent to the coil of the motor 4 in the linear compressor 1 so that a magnetic field is generated by the current flowing through the coil.
  • the movable element 4 b together with the piston 6 is reciprocated by the magnetic force acting between the movable element 4 b and the permanent magnet.
  • the greater the amplitude of the piston 6 the higher the voltage of the power supply unit 16 , and the greater the amplitude of the piston, the stronger the refrigerating performance in the system 21 .
  • the necessary refrigerating performance is different depending on the ambient temperature. That is, if the ambient temperature is high, the thermal load on the refrigerator is high, which requires the strong refrigerating performance. On the other hand, if the ambient temperature is low, the necessary refrigerating performance becomes weak. However, at this time, if the refrigerating performance is excessively strong, a compression ratio is raised to thereby reduce the system efficiency. Hence, the proper refrigerating performance needs to be selected from the viewpoint of the system efficiency.
  • the voltage determining means 17 outputs a high voltage target value if the ambient temperature is high, and outputs a low voltage target value if the transistor is low. Consequently, the power supply unit 16 outputs the voltage necessary for the proper refrigerating performance to the linear compressor 1 .
  • a frequency of an alternating power supply generated by the power supply unit 16 is given as a resonant frequency mainly determined by a mass of the movable device 11 and a spring constant of the elastic device 14 in the linear compressor 1 and the like. Consequently, the spring force of the elastic device 14 can be effectively used for the reciprocating motion of the movable device 11 .
  • Another object of the present invention is to reduce the occurrence of the circuit loss caused by the execution of the control without executing the control under the operating condition in which the necessity of the control is little.
  • Another object of the present invention is to avoid the unstable phenomenon of the piston caused by the unsuitable feedback control and carry out a stable operation.
  • the present invention is a control apparatus for a linear compressor driving system, which is used for a linear compressor driving system including: a linear compressor having a linear motor and a piston; and a power supply unit for supplying an electric power to the linear motor, including: an unstableness detecting means for detecting that a behavior of the piston is unstable and outputting an unstableness detection signal; and an unstableness avoiding means that is operated so as to act on the linear compressor driving system in accordance with the unstableness detection signal and thereby avoid the unstable state.
  • This has the effect of protecting the reduction in the reliability and the increase in the noise vibration, which are caused by the collision between the movable member and the fixed member since the behavior of the piston becomes unstable.
  • Another embodiment of the present invention is a control apparatus for a linear compressor driving system, which is used for a linear compressor driving system including: a linear compressor having a linear motor and a piston; and a power supply unit for supplying an electric power to the linear motor, including: an operating condition detecting means for detecting at least one of a displacement of the piston, an ambient temperature, a temperature at any part of the linear compressor driving system, and an operating pressure, and then outputting a detection signal; an unstableness detecting means, which if the detection signal of the operating condition detecting means satisfies a predetermined condition, estimates that a behavior of the piston is unstable, and then outputs an unstableness detection signal; and an unstableness avoiding means that is operated so as to act on the linear compressor driving system in accordance with the unstableness detection signal and thereby avoid the unstable state.
  • an operating condition detecting means for detecting at least one of a displacement of the piston, an ambient temperature, a temperature at any part of the linear compressor driving system, and an operating pressure, and then outputting a
  • Another embodiment of the present invention further includes a displacement detecting means for detecting a displacement of the piston.
  • the unstableness detecting means is designed so as to output the unstableness detection signal in accordance with an output of the displacement detecting means.
  • Another embodiment of the present invention further includes a sound and vibration detecting means for detecting sound or vibration of the compressor.
  • the unstableness detecting means is designed so as to output the unstableness detection signal in accordance with an output of the sound and vibration detecting means.
  • this has the effect of indirectly detecting that the behavior of the piston is unstable, from the sound and the vibration.
  • Another embodiment of the present invention further includes a voltage current detecting means for detecting a voltage or a current outputted by the power supply unit.
  • the unstableness detecting means is designed so as to output the unstableness detection signal in accordance with an output of the voltage current detecting means.
  • this has the effect of indirectly detecting that the behavior of the piston is unstable, from the voltage or the current of the power supply unit.
  • Another embodiment of the present invention further includes a pressure detecting means for detecting a pressure of the system.
  • the unstableness detecting means is designed so as to output the unstableness detection signal in accordance with an output of the pressure detecting means.
  • this has the effect of indirectly detecting that the behavior of the piston is unstable, from the pressure of the system.
  • Another embodiment of the present invention further includes an ambient temperature detecting means for detecting an ambient temperature.
  • the unstableness detecting means is designed so as to output the unstableness detection signal in accordance with an output of the ambient temperature detecting means.
  • this has the effect of indirectly detecting that the behavior of the piston is unstable, from the ambient temperature.
  • Another embodiment of the present invention further includes a temperature detecting means for detecting a temperature of the system.
  • the unstableness detecting means is designed so as to output the unstableness detection signal in accordance with an output of the temperature detecting means.
  • this has the effect of indirectly detecting that the behavior of the piston is unstable, from the temperature of a refrigerating system.
  • Another embodiment of the present invention is such that the unstableness avoiding means is designed so as to change a voltage waveform or a current waveform outputted by the power supply unit in accordance with the unstableness detection signal.
  • this has the effect of reducing the unstable phenomenon of the piston by changing the thrust property of a motor.
  • Another embodiment of the present invention further includes a waveform memory for storing waveforms having a plurality of patterns, and the unstableness avoiding means is designed so as to output, from the power supply, the voltage or the current based on the waveform stored in the waveform memory, in accordance with the unstableness detection signal.
  • the motor thrust property effective for avoiding the unstableness can be selected. Hence, this has the effect of reducing the unstable phenomenon of the piston,
  • Another embodiment of the present invention is such that the unstableness avoiding means is designed so as to change an impedance of the motor in accordance with the unstableness detection signal.
  • a method of changing the coil of the linear motor from a parallel wiring to a series wiring in accordance with the unstableness detection signal and the like are used to change the impedance of the motor.
  • the waveform of the current flowing through the motor is changed, and the thrust property of the motor is changed. Consequently, this has the effect of relaxing the unstable behavior of the piston.
  • Another embodiment of the present invention is such that the unstableness avoiding means is designed so as to change an air blowing amount to a heat exchanger in accordance with the unstableness detection signal.
  • the air blowing amount by changing the air blowing amount, the pressure of the system is varied to thereby changing the acting force on the piston. Hence, this has the effect of reducing the unstable behavior.
  • Another embodiment of the present invention is such that an air blowing amount changing means is designed so as to change a rotational speed and an air blowing path of an air blower.
  • an air blowing amount changing means is designed so as to change a rotational speed and an air blowing path of an air blower.
  • Another embodiment of the present invention is such that the unstableness avoiding means is designed so as to change a frequency outputted by the power supply unit in accordance with the unstableness detection signal.
  • this has the effect of reducing the unstable phenomenon of the piston due to the change of the operating frequency.
  • Another embodiment of the present invention is such that the unstableness avoiding means is designed so as to change the voltage or the current of the power supply unit in accordance with the unstableness detection signal.
  • this has the effect of increasing the top clearance of the piston to thereby avoid the collision, or selecting the stroke that does not lead to the occurrence of the unstable phenomenon.
  • Another embodiment of the present invention includes: a detecting means for detecting a current, a voltage or a piston displacement; a target value setting means for setting a target value of the current or the voltage or the piston displacement in accordance with an operating condition; a timer means for outputting a start signal at a predetermined interval; and a changing means for comparing an output of the detecting means with the target value in accordance with the start signal, and changing the voltage or the current outputted by the power supply unit at a predetermined change amount, correspondingly to the difference from the target value, wherein the unstableness avoiding means is designed so as to change at least one of the change amount of the detecting means and the output interval of the start signal of the timer means, in accordance with the unstableness detection signal.
  • this has the effect of avoiding the unstable phenomenon of the piston caused by the feedback control at the top dead center position of the piston.
  • FIG. 1 is a block diagram showing a first embodiment of a control apparatus for a linear compressor driving system according to the present invention
  • FIG. 2 is a waveform view of a current which is detected by a current detecting means in the first embodiment of the present invention and sent from a power supply unit to a linear compressor;
  • FIG. 3 is a flowchart showing an operation of an unstableness detecting means in the first embodiment of the present invention
  • FIG. 4 is a flowchart showing an operation of an unstableness avoiding means in the first embodiment of the present invention
  • FIG. 5 is a block diagram showing a second embodiment of a control apparatus for a linear compressor driving system according to the present invention.
  • FIG. 6 is a block diagram showing a third embodiment of a control apparatus for a linear compressor driving system according to the present invention.
  • FIG. 7 is a block diagram showing a fourth embodiment of a control apparatus for a linear compressor driving system according to the present invention.
  • FIG. 8 is a block diagram showing a fifth embodiment of a control apparatus for a linear compressor driving system according to the present invention.
  • FIG. 9 is a block diagram showing a sixth embodiment of a control apparatus for a linear compressor driving system according to the present invention.
  • FIG. 10 is a sectional view showing a conventional linear compressor
  • FIG. 11 is a block diagram showing a conventional linear compressor driving system and its control apparatus.
  • FIG. 1 is a block diagram showing a control apparatus for a linear compressor driving system according to a first embodiment of the present invention.
  • reference numeral 30 denotes a current detecting means for measuring a current of a power supply sent to a linear compressor 1 from a power supply unit 31 .
  • Reference numeral 32 denotes an unstableness detecting means for outputting an unstableness detection signal in accordance with an output of the current detecting means 30 .
  • the unstableness detecting means 32 extracts the variation in the peak value of the current measured by the current detecting means. If the variation in the peak value in a certain period is greater than a predetermined value, it estimates and judges that the behavior of the piston becomes unstable, and outputs the unstableness detection signal.
  • FIG. 2 is a waveform view of the current, which is detected by the current detecting means 30 in the first embodiment and sent to the linear compressor 1 from the power supply unit 31 .
  • FIG. 3 is a flowchart showing the operation of the unstableness detecting means 32 in the first embodiment.
  • t indicates a current detection cycle, and n detections are carried out in one detection cycle. Then, the manner when the detection values of n peak currents are obtained is shown, as illustrated by black points in the waveform.
  • the current detection values are represented by I(K-n+1), . . . I(K-2), . . . I(K-1) and I(K).
  • FIG. 3 is the flowchart showing the operation of CPU when the unstableness detecting means 32 is constituted by the CPU (Central Processing Unit) (not shown).
  • a step S 1 an initialization is carried out so as to reset the maximum current Imax and the minimum current value Imin in previous measurement values to zero.
  • K is a predetermined constant
  • n is a predetermined number of measurements per cycle
  • J is a variable obtained as the calculation result.
  • whether or not the variable J is greater than the constant K is judged at a step S 3 .
  • the operating flow proceeds to a step S 4 , and a current value I(J) is detected.
  • the current value I(J) detected at a step S 5 is greater than the Imax
  • the operating flow proceeds to a step S 6 , and the I(J) is defined as a new Imax.
  • the current value I(J) is not greater than the Imax at the step S 5
  • the operating flow proceeds to a step S 7 , and whether or not the current value I(J) is less than the Imin is judged. If the current value I(J) is less than the Imin, the I(J) is defined as a new Imin at a step S 8 .
  • the operating flow proceeds to a step S 9 . Even if the operations at the steps S 6 to S 8 have been ended, the operating flow proceeds to the step S 9 .
  • the variable J is incremented by 1, and the operating flow returns back to the step S 3 .
  • the operating flow proceeds to a step S 10 .
  • the difference between the Imax and the Imin is calculated to then judge whether or not this difference (Imax ⁇ Imin) is greater than a constant M. If the difference is greater than the constant M, the operating flow proceeds to a step S 11 .
  • Reference numeral 33 denotes an unstableness avoiding means.
  • the unstableness detection signal When the unstableness detection signal is inputted, it outputs a frequency change signal to the power supply unit 31 .
  • the frequency change signal When the frequency change signal is inputted to the power supply unit 31 , the power supply unit 31 changes the frequency of the power supply sent to the compressor 1 .
  • changing the operating frequency of the linear compressor can avoid the condition that the piston behavior becomes unstable.
  • FIG. 4 is a flowchart showing the operation when the unstableness avoiding means 33 in the first embodiment is constituted by the CPU.
  • the processes in FIG. 4 can be configured by an interrupting process corresponding to the process of FIG. 3 and the like.
  • a step S 21 in FIG. 4 the unstable flag set at the steps S 11 , S 12 in FIG. 3 is monitored.
  • the unstable flag is YES
  • the operating flow proceeds to a step S 22
  • the frequency of the driving current of the linear compressor is lowered by ⁇ H 1 .
  • the unstable flag is NO
  • the operating flow proceeds to a step S 23 .
  • the frequency of the driving current of the linear compressor is kept in its original state.
  • the control apparatus for the linear compressor driving system in this embodiment is provided with: the detecting means for detecting the current of the power supply; the unstableness detecting means for indirectly detecting that the behavior of the piston is unstable, in accordance with the output of the detecting means, and outputting the unstableness detection signal; and the unstableness avoiding means for changing the frequency of the power supply in accordance with the unstableness detection signal. Even if the piston behavior becomes unstable, this control apparatus stabilizes it by adjusting the frequency of the power supply. Thus, this can protect the occurrence of the noise vibration caused by the collision and the reduction in the reliability.
  • FIG. 5 is a block diagram showing a control apparatus for a linear compressor driving system according to a second embodiment of the present invention.
  • reference numeral 40 denotes a sound and vibration detecting means 40 constituted by a vibration pickup, and it is attached to a compressor and detects sound and vibration.
  • reference numeral 41 denotes an unstableness detecting means 41 .
  • the collision causes the collisional sound and vibration that are greater than the typical case to be generated in the compressor.
  • the unstableness detecting means 41 judges that the piston is unstable, and outputs the unstableness detection signal.
  • Reference numeral 42 denotes an unstableness avoiding means. If the unstableness detection signal is inputted, it outputs a voltage drop signal to a voltage determining means 43 .
  • the voltage determining means 43 usually outputs a voltage target value corresponding to an output of the ambient temperature detecting means 18 and controls an output voltage of the power supply unit 16 . However, if the voltage drop signal is inputted, the voltage determining means 43 outputs a voltage target value lower than the usual value, which results in the drop in the power supply voltage of the linear compressor 1 . Thus, the unstable condition in which the amplitude of the piston is reduced to bring about the collision is removed.
  • the sound and vibration detecting means 40 stop their functions. If the output of the ambient temperature detecting means 18 is less than the predetermined value, the sound and vibration detecting means 40 , the unstableness detecting means 41 and the unstableness avoiding means 42 stop their functions.
  • the sound and vibration detecting means 40 the unstableness detecting means 41 and the unstableness avoiding means 42 are not required. Hence, the stop of their functions enables the reduction in the electric power consumption.
  • the control apparatus for the linear compressor driving system in this embodiment is provided with: the sound and vibration detecting means for detecting the sound and the vibration of the compressor; the unstableness detecting means for outputting the unstableness detection signal in accordance with the output of the sound and vibration detecting means; the unstableness avoiding means for changing the voltage or the current of the power supply in accordance with the unstableness detection signal; and the detecting means for detecting the ambient temperature. Only if the output of the detecting means satisfies the predetermined condition, the unstableness detecting means and the unstableness avoiding means are actuated.
  • the piston behavior becomes unstable to thereby bring about the collision between the movable member and the fixed member in the compressor body
  • the collision is detected from the vibration, and the voltage sent to the compressor is dropped.
  • the collision is removed, and the occurrence of the noise and the vibration and the reduction in the reliability are protected.
  • the unstableness detecting means and the unstableness avoiding means are stopped in the operating condition that the unstable behavior of the piston is not induced. Hence it is possible to reduce the electric power consumption.
  • FIG. 6 is a block diagram showing a control apparatus for a linear compressor driving system according to a third embodiment of the present invention.
  • reference numeral 50 denotes a displacement detecting means, which is attached to a compressor, for measuring the displacement of a piston.
  • Reference numeral 51 denotes an unstableness detecting means, which detects the variation in the top dead center of the piston from the output of the displacement detecting means 50 , and outputs the unstableness detection signal if the variation in the top dead center is greater than a predetermined value.
  • Reference numeral 52 denotes an unstableness avoiding means, which outputs a constant voltage waveform in a usual case. However, if the unstableness detection signal is inputted, the unstableness avoiding means 52 selects a voltage waveform different from that outputted until this time, from waveforms stored in a waveform memory 53 , and outputs it.
  • a power supply unit 54 amplifies the voltage waveform outputted from the unstableness avoiding means 52 , to the voltage target value outputted from the voltage determining means 17 , and then outputs to the compressor 1 .
  • the thrust property of the linear compressor can be changed to thereby change the action force on the piston and further stabilize the behavior of the piston.
  • the control apparatus for the linear compressor driving system in this embodiment is provided with: the displacement detecting means for detecting the displacement of the piston; the unstableness detecting means for outputting the unstableness detection signal in accordance with the output of the displacement detecting means; the waveform memory for storing the waveforms of a plurality of patterns; and the unstableness avoiding means for sequentially outputting from the power supply the voltage waveforms stored in the waveform memory in accordance with the unstableness detection signal. Then, if the behavior of the piston becomes unstable, the waveform of the thrust of the linear motor is changed to thereby stabilize the piston behavior.
  • FIG. 7 is a block diagram showing a control apparatus for a linear compressor driving system according to a fourth embodiment of the present invention.
  • reference numeral 60 denotes an unstableness detecting means, which preliminarily stores an ambient temperature at which the behavior of the piston becomes unstable, as a predetermined value, and then outputs the unstableness detection signal at the predetermined ambient temperature to the output of an ambient temperature detecting means.
  • Reference numeral 61 denotes an unstableness avoiding means, which changes an impedance of a motor by using a method of changing a wiring of a linear motor of a compressor from a parallel wiring to a series wiring, in accordance with the unstableness detection signal, and the like. In association with this change, the waveform of the current flowing through the motor is changed, and the thrust property of the motor is also changed. Thus, it is possible to stabilize the behavior of the motor.
  • the control apparatus for the linear compressor driving system in this embodiment is provided with: the ambient temperature detecting means for detecting the ambient temperature; the unstableness detecting means for outputting the unstableness detection signal in accordance with the output of the ambient temperature detecting means; and the unstableness avoiding means for changing the impedance of the motor in accordance with the unstableness detection signal.
  • the impedance of the motor can be changed to thereby change the waveform of the thrust of the liner motor and further stabilize the piston behavior.
  • FIG. 8 is a block diagram showing a control apparatus for a linear compressor driving system according to a fifth embodiment of the present invention.
  • reference numeral 70 denotes a condenser
  • 71 denotes an expansion valve
  • 72 denotes an evaporator.
  • the condenser 70 and the evaporator 72 are the heat exchangers, respectively, as well known.
  • the combination of them constitutes the heat exchanger.
  • Reference numeral 73 denotes an air blower placed near the evaporator. Cold air generated in the evaporator 72 is sent into the refrigerator by the air blower 73 .
  • reference numeral 74 is a pressure detecting means attached to the compressor 1 .
  • Reference numeral 74 A denotes an unstableness detecting means, which judges that the behavior of the piston becomes unstable if an output of the pressure detecting means 74 satisfies a predetermined pressure condition, and outputs the unstableness detection signal.
  • Reference numeral 75 denotes an unstableness avoiding means, which when receiving the unstableness detection signal from the unstableness detecting means 74 A, increases the air blowing amount of the air blower 73 to thereby raise a temperature of the evaporator 72 and increase a low pressure. Consequently, the operating pressure condition is changed, and the action force on the piston is changed to thereby stabilize the behavior of the piston.
  • the control apparatus for the linear compressor driving system in this embodiment is provided with: the pressure detecting means for detecting the pressure of the system; the unstableness detecting means for outputting the unstableness detection signal in accordance with the output of the pressure detecting means; and the unstableness avoiding means for changing the air blowing amount to the heat exchanger in accordance with the unstableness detection signal.
  • the air blowing amount to the heat exchanger can be changed to thereby change the pressure condition.
  • the action force on the piston can be changed to thereby stabilize the piston behavior.
  • this embodiment is designed such that the pressure detecting means is defined as the air blower jointly placed in the heat exchanger.
  • the similar effect can be attained even by using a different means such as a valve that can change the pressure condition in the refrigerating system.
  • FIG. 9 is a block diagram showing a control apparatus for a linear compressor driving system according to a sixth embodiment of the present invention.
  • reference numeral 80 denotes a displacement detecting means, which detects a position of the piston and outputs a top dead center position signal of the piston.
  • Reference numeral 81 denotes a target value setting means, which outputs a standard value of a top dead center position of the piston.
  • Reference numeral 82 denotes a timer means, which outputs a start signal for each constant period.
  • reference numeral 83 denotes a changing means, which when receiving the start signal from the timer means 82 , changes a voltage setting value at a predetermined change amount for the difference between the standard value outputted by the target value setting means 81 and the top dead center position signal outputted by the displacement detecting means 80 , and outputs the voltage setting value.
  • reference numeral 84 denotes an unstableness detecting means, which stores the top dead center position signal outputted by the displacement detecting means 80 , and if a value of a variation in a constant temporal width exceeds a predetermined value, judges it to be unstable, and then outputs the unstableness detection signal.
  • Reference numeral 85 denotes an unstableness avoiding means, which when the unstableness detecting means outputs the unstableness detection signal, outputs a cyclic time setting signal to the timer means 82 , and changes the cycle of the start signal output of the timer means 82 .
  • the control apparatus for the linear compressor driving system in this embodiment is provided with: the target value setting means for setting the predetermined target value on the basis of the operating condition; the detecting means for detecting the displacement of the piston; the unstableness detecting means for detecting that the piston is at the unstable behavior and outputting the unstableness detection signal; the unstableness avoiding means for suppressing or avoiding the unstableness in accordance with the unstableness detection signal; the timer means for outputting the start signal at the predetermined interval; and the changing means for comparing the output of the detecting means with the target value in accordance with the start signal and changing the voltage or the current of the power supply at the predetermined change amount, on the basis of the difference from the target value.
  • the unstableness avoiding means can avoid the unstableness of the piston behavior caused by the feedback control, since the changing means changes the output timing of the start signal of the timer means, for the difference between the output of the detecting means and the target value, and thereby relaxes the unstableness.
  • the present invention include: the unstableness detecting means for directly or indirectly detecting that the behavior of the piston is unstable and outputting the unstableness detection signal; and the unstableness avoiding means to be operated in accordance with the unstableness detection signal.
  • the unstableness detecting means for directly or indirectly detecting that the behavior of the piston is unstable and outputting the unstableness detection signal
  • the unstableness avoiding means to be operated in accordance with the unstableness detection signal can protect the unstable behavior of the piston and protect the reduction in the reliability and the occurrence of the noise vibration, which are caused by the collision.
  • Another embodiment of the present invention further includes the detecting means for detecting at least one of the displacement of the piston, the ambient temperature, the system temperature, and the pressure condition.
  • the unstableness detecting means and the unstableness avoiding means are designed so as to act only if the output of the detecting means satisfies the predetermined condition. Hence, the electric power consumption can be reduced by designing that the operations for detecting and avoiding the unstableness are not carried out under the condition in which the collision is not induced.
  • Another embodiment of the present invention further includes the displacement detecting means for detecting the displacement of the piston.
  • the unstableness detecting means is designed so as to output the unstableness detection signal in accordance with the output of the displacement detecting means. Thus, this can directly detect the unstable behavior, from the displacement of the piston.
  • Another embodiment of the present invention further includes the sound and vibration detecting means for detecting the sound and the vibration of the compressor.
  • the unstableness detecting means is designed so as to output the unstableness detection signal in accordance with the output of the sound and vibration detecting means. Thus, this can indirectly detect the unstable phenomenon of the piston, from the sound and the vibration.
  • Another embodiment of the present invention further includes the detecting means for detecting the voltage or the current of the power supply.
  • the unstableness detecting means is designed so as to output the unstableness detection signal in accordance with the output of the detecting means. Thus, this can indirectly detect the unstable phenomenon of the piston, from the voltage or the current.
  • Another embodiment of the present invention further includes the pressure detecting means for detecting the pressure of the system.
  • the unstableness detecting means is designed so as to output the unstableness detection signal in accordance with the output of the pressure detecting means. Thus, this can indirectly detect the unstable phenomenon of the piston, from the current or the voltage.
  • Another embodiment of the present invention further includes the ambient temperature detecting means for detecting the ambient temperature.
  • the unstableness detecting means is designed so as to output the unstableness detection signal in accordance with the output of the ambient temperature detecting means. Thus, this can indirectly detect the unstable phenomenon of the piston, from the ambient temperature.
  • Another embodiment of the present invention further includes the temperature detecting means for detecting the temperature of the system.
  • the unstableness detecting means is designed so as to output the unstableness detection signal in accordance with the output of the temperature detecting means. Thus, this can indirectly detect the unstable phenomenon of the piston, from the temperature of the refrigerating system.
  • Another embodiment of the present invention is such that the unstableness avoiding means is designed so as to change the voltage waveform or the current waveform of the power supply in accordance with the unstableness detection signal.
  • the thrust property of the linear motor is changed. It is possible to stabilize the behavior of the piston.
  • Another embodiment of the present invention further includes the waveform memory for storing the waveforms having the plurality of patterns.
  • the unstableness avoiding means is designed so as to sequentially output, from the power supply, the voltage or current waveform stored in the waveform memory, in accordance with the unstableness detection signal.
  • the thrust property of the linear motor is changed. It is possible to stabilize the behavior of the piston.
  • Another embodiment of the present invention is such that the unstableness avoiding means is designed so as to change the impedance of the motor in accordance with the unstableness detection signal.
  • the thrust property of the linear motor is changed. It is possible to stabilize the behavior of the piston.
  • Another embodiment of the present invention is such that the unstableness avoiding means is designed so as to change amount of the air blowing into the heat exchanger in accordance with the unstableness detection signal.
  • the acting force by the pressure varies, and it is possible to stabilize the behavior of the piston.
  • Another embodiment of the present invention is such that the unstableness avoiding means is designed so as to open and close the valve or change the air blowing amount to the heat exchanger in accordance with the unstableness detection signal.
  • the acting force by the pressure is changed. It is possible to stabilize the behavior of the piston.
  • Another embodiment of the present invention is such that the unstableness avoiding means is designed so as to change the frequency of the power supply in accordance with the unstableness detection signal. Thus, it is possible to stabilize the behavior of the piston.
  • Another embodiment of the present invention is such that the unstableness avoiding means is designed so as to change the voltage or the current of the power supply in accordance with the unstableness detection signal.
  • this can increase the top clearance, protect the reduction in the reliability caused by the collision and protect the occurrence of the noise and the vibration.
  • Another embodiment of the present invention is provided with: the detecting means for detecting the current, the voltage or the piston displacement; the target value setting means for setting the target value of the current or the voltage or the piston displacement in accordance with the operating condition; the timer means for outputting the start signal at the predetermined interval; and the changing means for comparing the output of the detecting means with the target value in accordance with the start signal, and changing the voltage or the current of the power supply at the predetermined change amount, correspondingly to the difference from the target value, wherein the unstableness avoiding means is designed so as to change at least one of the change amount of the detecting means and the output interval of the start signal of the timer means, in accordance with the unstableness detection signal.
  • the unstableness avoiding means is designed so as to change at least one of the change amount of the detecting means and the output interval of the start signal of the timer means, in accordance with the unstableness detection signal.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Positive-Displacement Pumps (AREA)
  • Compressors, Vaccum Pumps And Other Relevant Systems (AREA)
  • Air Conditioning Control Device (AREA)
  • Control Of Linear Motors (AREA)
US10/473,116 2001-03-28 2002-03-27 Control device of linear compressor drive system Abandoned US20040101413A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2001-092516 2001-03-28
JP2001092516A JP2002285958A (ja) 2001-03-28 2001-03-28 リニアコンプレッサの制御装置
PCT/JP2002/002993 WO2002079651A1 (fr) 2001-03-28 2002-03-27 Dispositif de commande d'un dispositif d'entrainement a compression lineaire

Publications (1)

Publication Number Publication Date
US20040101413A1 true US20040101413A1 (en) 2004-05-27

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US10/473,116 Abandoned US20040101413A1 (en) 2001-03-28 2002-03-27 Control device of linear compressor drive system

Country Status (5)

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US (1) US20040101413A1 (zh)
JP (1) JP2002285958A (zh)
KR (1) KR20030096289A (zh)
CN (1) CN1509376A (zh)
WO (1) WO2002079651A1 (zh)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050210904A1 (en) * 2004-03-29 2005-09-29 Hussmann Corporation Refrigeration unit having a linear compressor
EP1720245A2 (en) * 2005-05-06 2006-11-08 LG Electronics Inc. Apparatus and method for controlling operation of reciprocating compressor
US20090047154A1 (en) * 2004-08-30 2009-02-19 Lg Electronics, Inc. Linear Compressor
CN102918821A (zh) * 2010-05-27 2013-02-06 诺基亚公司 用于基于用户数据识别网络功能的方法和装置
WO2017076099A1 (zh) * 2015-11-05 2017-05-11 青岛海尔股份有限公司 采用直线压缩机的冰箱控制方法及控制系统
US20190355342A1 (en) * 2018-05-18 2019-11-21 Bose Corporation Real-time detection of feedforward instability

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6970793B2 (en) 2003-02-10 2005-11-29 Flow International Corporation Apparatus and method for detecting malfunctions in high-pressure fluid pumps
BRPI0800251B1 (pt) * 2008-02-22 2021-02-23 Embraco Indústria De Compressores E Soluções Em Refrigeração Ltda sistema e método de controle de compressor linear
JP7143272B2 (ja) * 2019-12-24 2022-09-28 ツインバード工業株式会社 フリーピストン型スターリング冷凍機

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5475851A (en) * 1986-04-14 1995-12-12 National Instruments Corporation Method and apparatus for improved local and global variable capabilities in a graphical data flow program
US5704217A (en) * 1995-09-22 1998-01-06 Nippondenso Co., Ltd. Air conditioner for vehicle, improved for frost deposition
US5897296A (en) * 1995-11-15 1999-04-27 Matsushita Electric Industrial Co., Ltd. Vibrating compressor
US5980211A (en) * 1996-04-22 1999-11-09 Sanyo Electric Co., Ltd. Circuit arrangement for driving a reciprocating piston in a cylinder of a linear compressor for generating compressed gas with a linear motor
US6153951A (en) * 1998-04-20 2000-11-28 Matsushita Refrigeration Company Structure of linear compressor

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02145678U (zh) * 1989-05-16 1990-12-11
JP2912860B2 (ja) * 1995-10-16 1999-06-28 松下冷機株式会社 冷蔵庫
JP3869481B2 (ja) * 1995-10-20 2007-01-17 三洋電機株式会社 リニアコンプレッサの駆動装置
JP3527974B2 (ja) * 1998-03-31 2004-05-17 株式会社トヨトミ 空気調和機の制御装置
JPH11311185A (ja) * 1998-04-28 1999-11-09 Matsushita Refrig Co Ltd 往復動圧縮機
JP3889519B2 (ja) * 1998-11-17 2007-03-07 三洋電機株式会社 リニアコンプレッサ
JP2001073944A (ja) * 1999-09-07 2001-03-21 Matsushita Electric Ind Co Ltd リニアコンプレッサーの駆動装置

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5475851A (en) * 1986-04-14 1995-12-12 National Instruments Corporation Method and apparatus for improved local and global variable capabilities in a graphical data flow program
US5704217A (en) * 1995-09-22 1998-01-06 Nippondenso Co., Ltd. Air conditioner for vehicle, improved for frost deposition
US5897296A (en) * 1995-11-15 1999-04-27 Matsushita Electric Industrial Co., Ltd. Vibrating compressor
US5980211A (en) * 1996-04-22 1999-11-09 Sanyo Electric Co., Ltd. Circuit arrangement for driving a reciprocating piston in a cylinder of a linear compressor for generating compressed gas with a linear motor
US6153951A (en) * 1998-04-20 2000-11-28 Matsushita Refrigeration Company Structure of linear compressor

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20050210904A1 (en) * 2004-03-29 2005-09-29 Hussmann Corporation Refrigeration unit having a linear compressor
US20090047154A1 (en) * 2004-08-30 2009-02-19 Lg Electronics, Inc. Linear Compressor
US9243620B2 (en) * 2004-08-30 2016-01-26 Lg Electronics Inc. Apparatus for controlling a linear compressor
EP1720245A2 (en) * 2005-05-06 2006-11-08 LG Electronics Inc. Apparatus and method for controlling operation of reciprocating compressor
EP1720245A3 (en) * 2005-05-06 2006-12-06 LG Electronics Inc. Apparatus and method for controlling operation of reciprocating compressor
CN102918821A (zh) * 2010-05-27 2013-02-06 诺基亚公司 用于基于用户数据识别网络功能的方法和装置
WO2017076099A1 (zh) * 2015-11-05 2017-05-11 青岛海尔股份有限公司 采用直线压缩机的冰箱控制方法及控制系统
US20180216861A1 (en) * 2015-11-05 2018-08-02 Qingdao Haier Joint Stock Co., Ltd. Refrigerator Control Method and System Using Linear Compressor
US10591196B2 (en) 2015-11-05 2020-03-17 Qingdao Haier Joint Stock Co., Ltd Refrigerator control method and system using linear compressor
US20190355342A1 (en) * 2018-05-18 2019-11-21 Bose Corporation Real-time detection of feedforward instability
US10885896B2 (en) * 2018-05-18 2021-01-05 Bose Corporation Real-time detection of feedforward instability

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WO2002079651A1 (fr) 2002-10-10
CN1509376A (zh) 2004-06-30
KR20030096289A (ko) 2003-12-24

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