JP4930440B2 - Refrigeration cycle equipment - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a refrigeration cycle device for determining whether or not a spool is fixed in a flow rate detection device. <P>SOLUTION: The refrigeration cycle device includes a compressor 2 for sucking, compressing and discharging a refrigerant; a throttle part 31 provided on the discharge side of the compressor 2; the spool 36 moved corresponding to pressure loss in the throttle part 31; elastic bodies 38, 39 for energizing the spool 36 in the non-fixation initial position; a flow rate detection means 32 having a position detection means 42 for detecting the position of the spool 36 and detecting a flow rate of the discharge refrigerant of the compressor 2 based on the position of the spool 36; and a fixation determination means for determining that the spool 36 is fixed when the position of the spool 36 detected by the position detection means 42 is located distantly with respect to the non-fixation initial position compared to a first reference position set near the non-fixation initial position, during non-operation of the compressor 2. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a refrigeration cycle apparatus having a flow rate detection device that detects a refrigerant flow rate of a refrigeration cycle.

Conventionally, a flow rate detection device that detects the flow rate of refrigerant discharged from a compressor in a refrigeration cycle has been disclosed (for example, Patent Document 1). In Patent Document 1, appropriate engine control is realized by inputting highly accurate information about the compressor torque calculated based on the refrigerant flow rate detected by the flow rate detection device to the engine control device.
Japanese Patent Application Publication No. 2007-2111703

  By the way, the flow rate detection device described in Patent Document 1 is housed in a sealed chamber inside the case, and moves with a fluid pressure corresponding to a change in the flow rate of the refrigerant, and a spring that biases the spool in a direction opposite to the fluid pressure. And a magnet attached to the spool and a magnetic sensor disposed on the outer side of the case so as to face the magnet.

  However, in such a configuration, there is a possibility that the spool is fixed when a foreign object or the like is caught in the sliding portion between the spool and the sealing chamber. When the spool is fixed, the flow rate of refrigerant discharged from the compressor and the driving torque of the compressor are not accurately calculated, so that appropriate engine control is not performed, and problems such as engine stall may occur. The control device controls the engine output based on the driving torque of the compressor so that the engine speed does not fluctuate even if the driving torque of the compressor changes.

  An object of this invention is to provide the refrigerating-cycle apparatus which can determine the presence or absence of the sticking of the spool in a flow volume detection apparatus in view of the said point.

  In order to achieve the above object, in the first aspect of the present invention, a compressor (2) that sucks and compresses and discharges a refrigerant, a throttle portion (31) provided on the discharge side of the compressor (2), The spool (36) that moves according to the pressure loss in the throttle part (31), the elastic bodies (38, 39) that urge the spool (36) to the non-fixed initial position, and the position detection that detects the position of the spool (36). Means (42) for detecting the flow rate of refrigerant discharged from the compressor (2) based on the position of the spool (36), and position detecting means (32) when the compressor (2) is not in operation. 42) When the position of the spool (36) detected by (42) is located farther than the first reference position set in the vicinity of the non-fixed initial position with respect to the non-fixed initial position, the spool (36) And a sticking judgment means for judging that the stick is stuck. It is characterized in that.

  Thereby, when the compressor (2) is not in operation, the spool (36) is not fixed when the detection position of the spool (36) is located farther from the first reference position with respect to the non-fixed initial position. It can be determined that it is stuck outside the vicinity of the initial position. Here, when the spool (36) is not fixed when the compressor (2) is not in operation, the refrigerant does not circulate in the cycle and no pressure loss occurs in the throttle portion (31). The elastic body (38, 39) is biased to the non-fixed initial position.

  Note that “when the compressor (2) is not in operation” means a substantially stopped state in which the compressor (2) does not perform the compression operation of compressing the refrigerant. The “first reference position” is a position defined according to the detection accuracy of the position of the spool (36) of the position detection means (42), the individual difference of the flow rate detection means, and the like. When the detection accuracy is high, the position can be substantially the same as the non-fixed initial position.

  According to a second aspect of the present invention, in the first aspect of the present invention, the sticking determination means further includes the spool (36) detected by the position detection means (42) when the compressor (2) is operated. It is determined that the spool (36) is fixed when the position is closer to the non-fixed initial position than the second reference position set in the vicinity of the non-fixed initial position. It is said.

  As a result, when the compressor (2) is operated, if the detection position of the spool (36) is located closer to the non-fixed initial position than the second reference position, the spool (36) is not fixed. It can be determined that it is fixed in the vicinity of the position. Here, when the spool (36) is not fixed when the compressor (2) is operated, the refrigerant circulates in the cycle, and the spool (36) is in the vicinity of the non-fixed initial position due to the pressure loss in the throttle portion (31). Move away from the location.

  “When the compressor (2) is in operation” means a state in which the compressor (2) performs a compression operation of compressing the refrigerant. Further, the second reference position is a position defined according to the detection accuracy of the position of the spool (36) of the position detection means (42), the individual difference of the flow rate detection means, and the like, similar to the first reference position, When the detection accuracy of the position detection means (42) is high, the position can be substantially the same as the non-fixed initial position. Further, the second reference position may be the same position as the first reference position or may be a different position.

  In the invention according to claim 3, the compressor (2) for sucking and compressing and discharging the refrigerant, the throttle part (31) provided on the discharge side of the compressor (2), and the throttle part (31) A spool (36) that moves in response to a pressure loss in the cylinder, an elastic body (38, 39) that biases the spool (36) to a non-fixed initial position, and a position detection means that detects the position of the spool (36), A flow rate detection means (32) for detecting the refrigerant flow rate on the discharge side of the compressor (2) based on the position of the spool (36), a discharge capacity variable mechanism for varying the discharge capacity of the compressor (2), and a discharge capacity variable mechanism And determining whether or not the spool (36) is fixed based on the position of the spool (36) detected by the position amount detecting means and the discharge capacity control means for outputting the control current to the discharge capacity variable mechanism. With a sticking judgment means to enable discharge capacity The mechanism is configured such that when the control current output from the discharge capacity control means exceeds the first predetermined current, the discharge capacity of the compressor (2) becomes the maximum discharge capacity. After the current exceeds the first predetermined current, the position of the spool (36) detected by the position amount detection means is greater than the second reference position set in the vicinity of the non-fixed initial position with respect to the non-fixed initial position. It is characterized in that it is determined that the spool (36) is fixed when it is located nearby.

  As described above, when the control current output to the variable discharge capacity mechanism of the compressor (2) exceeds the first predetermined current, the discharge capacity of the compressor (2) becomes the maximum discharge capacity, and the refrigerant flows in the cycle. In order to circulate, when the detection position of the spool (36) is located closer to the non-fixed initial position than the second reference position, the spool (36) is fixed near the non-fixed initial position. Can be determined. Here, the maximum discharge capacity means a discharge capacity at which the discharge capacity per rotation of the compressor (2) is maximum (100%).

  According to a fourth aspect of the present invention, in the third aspect of the present invention, the discharge capacity varying mechanism is configured such that when the control current output from the discharge capacity control means is less than the second predetermined current, the compressor ( 2) The discharge capacity of 2) is configured to be the minimum discharge capacity, and the sticking determination means detects the position of the spool (36) detected by the position detection means (42) after the control current falls below the second predetermined current. The spool (36) is determined to be fixed when it is located closer to the non-fixed initial position than the first reference position set in the vicinity of the non-fixed initial position. .

  As described above, when the control current output to the variable discharge capacity mechanism of the compressor (2) is lower than the second predetermined current, the discharge capacity of the compressor (2) becomes the minimum discharge capacity, and the refrigerant flows in the cycle. Since the spool does not circulate, when the detection position of the spool (36) is located farther than the first reference position with respect to the non-fixed initial position, the spool (36) is at a position other than the vicinity of the non-fixed initial position. It can be judged that it has adhered. Here, the minimum discharge capacity means a discharge capacity at which the discharge capacity per rotation of the compressor (2) is minimum (approximately 0%).

  According to a fifth aspect of the present invention, the pressure detecting means (125) for detecting the refrigerant pressure on the discharge side of the compressor (2) and the compressor (2) according to the third or fourth aspect of the present invention are provided. Based on the engine speed detecting means (127) for detecting the engine speed of the engine (11) to be driven, the refrigerant pressure detected by the pressure detecting means (125), and the refrigerant flow rate detected by the flow rate detecting means (32). And a first drive torque estimating means for estimating the first drive torque of the compressor (2), and the output of the engine (11) is controlled based on the first drive torque estimated by the first drive torque estimating means. Even if the first drive torque fluctuates, the engine speed (11) maintains the preset reference engine speed, and the discharge capacity control means includes engine speed detection means (127). Detected by The control current output to the variable discharge capacity mechanism is increased when the engine speed becomes abnormal with the engine speed fluctuating above a reference fluctuation amount set in advance with respect to the reference engine speed. It is characterized by.

  As described above, when the engine speed is in an abnormal state in which the engine speed fluctuates by more than the reference fluctuation amount with respect to the reference engine speed, the refrigerant flow rate detected by the flow rate detection means (32) is an abnormal value. Since there is a high possibility, the discharge current control means forcibly increases the control current output to the variable discharge capacity mechanism and increases the flow rate of the refrigerant circulating in the cycle.

  As a result, the control current output to the discharge capacity variable mechanism by the discharge capacity control means is likely to exceed the first predetermined current, so that the spool (36) can be positively determined. Here, a pressure detection means (125) is not limited to what detects the refrigerant | coolant pressure of the discharge side of a compressor (2) directly, The thing detected indirectly is also included.

  According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the discharge capacity control means outputs the control current output to the variable discharge capacity mechanism when the engine speed is abnormal. It is characterized by increasing until it exceeds a predetermined current.

  In this way, when the engine speed is abnormal, the control flow output to the discharge capacity variable mechanism by the discharge capacity control means is forcibly increased until it exceeds the first predetermined current, thereby reliably increasing the refrigerant flow rate. It is possible to determine whether or not the spool (36) is stuck in the increased state.

  According to a seventh aspect of the invention, in the fourth aspect of the invention, the pressure detecting means (125) for detecting the refrigerant pressure on the discharge side of the compressor (2) and the compressor (2) are driven. Compression based on the engine speed detection means (127) for detecting the engine speed of the engine (11), the refrigerant pressure detected by the pressure detection means (125), and the refrigerant flow rate detected by the flow rate detection means (32) First driving torque estimating means for estimating the first driving torque of the machine (2), the output of the engine (11) is controlled based on the first driving torque estimated by the first driving torque estimating means, Even if the driving torque fluctuates, the engine speed (11) maintains the preset reference engine speed, and the discharge capacity control means is detected by the engine speed detection means (127). Was The control current output to the variable discharge capacity mechanism is reduced when the engine speed is in an abnormal state where the engine speed fluctuates above a reference fluctuation amount set in advance with respect to the reference engine speed. It is said.

  As described above, when the engine speed is in an abnormal state in which the engine speed fluctuates by more than the reference fluctuation amount with respect to the reference engine speed, the refrigerant flow rate detected by the flow rate detection means (32) is an abnormal value. Since there is a high possibility, the discharge current control means forcibly reduces the control current output to the discharge capacity variable mechanism, and the refrigerant flow rate circulating in the cycle is reduced.

  As a result, the control current output to the discharge capacity variable mechanism by the discharge capacity control means is likely to be lower than the second predetermined current, so that the spool (36) can be positively determined.

  According to an eighth aspect of the invention, in the seventh aspect of the invention, the discharge capacity control means outputs the control current output to the variable discharge capacity mechanism when the engine speed is abnormal. It is characterized in that it is decreased until it falls below a predetermined current.

  In this way, when the engine speed is abnormal, the control flow output to the discharge capacity variable mechanism by the discharge capacity control means is forcibly decreased until it falls below the second predetermined current, thereby reliably reducing the refrigerant flow rate. It is possible to determine whether or not the spool (36) is firmly fixed in the reduced state.

  In the invention according to claim 9, in the invention according to claims 5 to 8, the sticking determination means determines whether or not the spool (36) is stuck only when the engine speed is abnormal. It is characterized by determining.

  As described above, the determination of the fixation of the spool (36) can be performed in accordance with the state of the engine (11) only when the engine speed is abnormal. Thus, it is possible to improve the efficiency of determining whether the spool (36) is fixed.

  Further, in the invention described in claim 10, in the invention described in claim 3 or 4, the pressure detecting means (125) for detecting the refrigerant pressure on the discharge side of the compressor (2), and the pressure detecting means (125). The first drive torque estimating means for estimating the first drive torque of the compressor (2) based on the refrigerant pressure detected in step (b) and the refrigerant flow rate detected by the flow rate detection means (32), and detected by the pressure detection means. Second drive torque estimating means for estimating the second drive torque of the compressor (2) based on the refrigerant pressure and the control current output to the variable discharge capacity mechanism, wherein the discharge capacity control means comprises the first drive torque. When the difference between the first drive torque estimated by the estimation means and the second drive torque estimated by the second drive torque estimation means is in a drive torque estimation abnormal state exceeding a preset reference value, Output to variable capacity mechanism It is characterized by increasing the control current.

  As described above, when the difference between the estimated first driving torque and the second driving torque exceeds the reference value and the driving torque estimation abnormality state occurs, the refrigerant flow rate detected by the flow rate detection means (32) is an abnormal value. Since there is a high possibility, the discharge current control means forcibly increases the control current output to the variable discharge capacity mechanism and increases the flow rate of the refrigerant circulating in the cycle.

  As a result, the control current output to the discharge capacity variable mechanism by the discharge capacity control means is likely to exceed the first predetermined current, so that the spool (36) can be positively determined.

  According to an eleventh aspect of the present invention, in the tenth aspect of the present invention, the discharge capacity control means outputs a control current output to the variable discharge capacity mechanism when the drive torque estimation abnormal state occurs. It is characterized by increasing until it exceeds a predetermined current.

  In this way, when the drive torque estimation abnormal state occurs, the control flow output to the discharge capacity variable mechanism by the discharge capacity control means is forcibly increased until it exceeds the first predetermined current, thereby reliably increasing the refrigerant flow rate. It is possible to determine whether or not the spool (36) is stuck in the increased state.

  According to a twelfth aspect of the present invention, in the fourth aspect of the present invention, the pressure detection means (125) for detecting the refrigerant pressure on the discharge side of the compressor (2) and the pressure detection means (125) are used. The first driving torque estimating means for estimating the first driving torque of the compressor (2) based on the refrigerant pressure and the refrigerant flow rate detected by the flow rate detecting means (32), and the pressure detecting means (125). Second drive torque estimating means for estimating the second drive torque of the compressor (2) based on the refrigerant pressure and the control current output to the variable discharge capacity mechanism, wherein the discharge capacity control means comprises the first drive When the difference between the first driving torque estimated by the torque estimating means and the second driving torque estimated by the second driving torque estimating means becomes a driving torque estimation abnormal state exceeding a preset reference value, Output to variable discharge capacity mechanism It is characterized by reducing that control current.

  In this way, when the difference between the estimated first driving torque and the second driving torque becomes a driving torque estimation abnormal state in which the difference exceeds the reference value, the refrigerant flow rate detected by the flow rate detection means (32) is an abnormal value. Since the possibility is high, the discharge current control means forcibly reduces the control current output to the discharge capacity variable mechanism, and the refrigerant flow rate circulating in the cycle is reduced.

  As a result, the control current output to the discharge capacity variable mechanism by the discharge capacity control means is likely to be lower than the first predetermined current, so that the spool (36) can be positively determined.

  In a thirteenth aspect of the present invention, in the twelfth aspect of the present invention, the discharge capacity control means outputs a control current output to the variable discharge capacity mechanism when the drive torque estimation abnormality state occurs. It is characterized in that it is decreased until it falls below a predetermined current.

  In this way, when the drive torque estimation abnormal state occurs, the control flow output to the discharge capacity variable mechanism by the discharge capacity control means is forcibly decreased until it falls below the second predetermined current, thereby reliably reducing the refrigerant flow rate. It is possible to determine whether or not the spool (36) is firmly fixed in the reduced state.

  Further, in the invention described in claim 14, in the invention described in any one of claims 10 to 13, the fixing determination means is configured so that the spool (36) is fixed only when the drive torque estimation abnormal state occurs. It is characterized by determining whether or not.

  As described above, the determination of the spool (36) is fixed only when the drive torque estimation abnormality state occurs, so that the determination of the spool (36) is determined based on the state of the first drive torque that is the engine output control factor. Therefore, it is possible to improve the efficiency of determining whether the spool (36) is fixed.

  Further, as in the invention described in claim 15, in the invention described in any one of claims 1 to 14, when it is determined by the fixing determination means that the spool (36) is fixed, the compression is performed. The operation of the machine (2) can be stopped.

  According to a sixteenth aspect of the present invention, in the invention according to any one of the first to fifteenth aspects, the position detecting means faces the magnetic body (37) provided on the spool (36). It is good also as a magnetic flux density sensor (42) which is arrange | positioned and detects the magnetic flux density which changes with the movement of a magnetic body (37).

  In addition, the code | symbol in the bracket | parenthesis of each said means shows the correspondence with the specific means as described in embodiment mentioned later.

(First embodiment)
Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. In the present embodiment, the present invention is applied to a vehicle air conditioner. Here, FIG. 1 is an overall configuration diagram showing an overview of the overall configuration of the vehicle air conditioner.

  A refrigeration cycle apparatus 1 that constitutes a part of a vehicle air conditioner is arranged in an engine room and includes a compressor 2. The compressor 2 in the refrigeration cycle apparatus 1 sucks, compresses and discharges a refrigerant on the downstream side of the evaporator 6 described later, and a driving force is transmitted from the engine 11 via the electromagnetic clutch 9 and the belt mechanism 10. Is rotated. The schematic configuration of the compressor 2 will be described later.

  The discharge side of the compressor 2 is connected to the inlet side of the condenser 3. The condenser 3 is disposed in the engine room between the engine 11 and a vehicle front grill (not shown), and is blown by a refrigerant discharged from the compressor 2 and a blower fan (not shown). It is a radiator that cools the refrigerant by exchanging heat with the outside air.

  The outlet side of the condenser 3 is connected to the inlet side of the gas-liquid separator 4. The gas-liquid separator 4 separates the refrigerant cooled by the condenser 3 into a gas phase refrigerant and a liquid phase refrigerant.

  The liquid-phase refrigerant outlet side of the gas-liquid separator 4 is connected to the expansion valve 5. The expansion valve 5 expands the liquid-phase refrigerant separated by the gas-liquid separator 4 under reduced pressure, and adjusts the flow rate of the refrigerant flowing out from the outlet side of the expansion valve 5.

  Specifically, the expansion valve 5 has a temperature sensing cylinder 5a that detects a refrigerant temperature between the compressor 2 and an evaporator 6 described later, and adjusts the temperature and pressure of the refrigerant sucked into the compressor 2. Based on this, the degree of superheat of the suction side refrigerant of the compressor 2 is detected, and the valve opening is adjusted so that the degree of superheat becomes a predetermined degree of superheat set in advance.

  The downstream side of the expansion valve 5 is connected to the evaporator 6. The evaporator 6 is disposed in the air conditioning case 7 of the air conditioning unit, and exchanges heat between the refrigerant decompressed and expanded by the expansion valve 5 and the blown air blown by the blower fan 12 disposed in the air conditioning case 7. Heat exchanger.

  Here, air in the vehicle compartment (inside air) or air outside the vehicle compartment (outside air) sucked from a well-known inside / outside air switching box (not shown) provided in the air conditioning case 7 passes through the inside of the air conditioning case 7 by the blower 12. Air is blown toward the room. This blown air passes through the evaporator 6, then passes through a heater unit (not shown), and is blown out from the outlet to the vehicle interior.

  Further, an evaporator temperature sensor 124 including a thermistor for detecting the temperature of the blown air immediately after passing through the evaporator 6 (evaporator temperature) is provided in the air conditioning case 7 immediately after the air blown out of the evaporator 6. It has been. The evaporator temperature sensor 124 may be configured to detect the fin temperature (evaporator temperature) of the evaporator 6.

  Furthermore, at the air downstream end of the air conditioning case 7, there are a face outlet for blowing air to the upper body of an occupant (not shown), a foot outlet for blowing air to the occupant's feet, and a defroster outlet for blowing air to the inner surface of the windshield. Is formed, and a blowout mode door (not shown) for switching and opening and closing these blowout openings is provided.

  The downstream side of the evaporator 6 is connected to a later-described suction port 21 of the compressor 2, and the evaporated refrigerant flows into the compressor 2 again. As described above, in the refrigeration cycle apparatus 1, the refrigerant circulates in the order of the compressor 2 → the condenser 3 → the gas-liquid separator 4 → the expansion valve 5 → the evaporator 6 → the compressor 2.

  Next, the outline | summary of the electric control part 100 of this embodiment is demonstrated. The electric control unit 100 includes an air conditioner control unit 100a (air conditioner ECU) and an engine control unit 100b (engine ECU), each of which includes a known microcomputer including a CPU, a ROM, a RAM, and the like and peripheral circuits thereof. .

  Here, the air-conditioner control unit 100a receives sensor detection signals from the air-conditioning sensor groups 121 to 125, and operation signals from various air-conditioning operation switches SW provided on the air-conditioning operation panel 126 disposed in the vicinity of the instrument panel in the front of the passenger compartment. Based on the above, comprehensive control of the vehicle air conditioner is performed. The air conditioner control unit 100a stores a control program for the air conditioning control device 9 and the like in the ROM of the microcomputer, and performs various arithmetic processes based on the control program.

  The air conditioning sensor group includes an outside air sensor 121 that detects the outside air temperature Tam, an inside air sensor 122 that detects the inside air temperature Tr, a solar radiation sensor 123 that detects the amount of solar radiation Ts incident on the passenger compartment, and an air outlet of the evaporator 6. An evaporator temperature sensor 124 that is disposed to detect the evaporator blown air temperature TE, a high pressure sensor 125 that detects the pressure (discharge refrigerant pressure) Pd of the discharge refrigerant discharged from the compressor 2, and a flow rate detection device 30 are provided. It has been.

  Here, in the present embodiment, the high pressure sensor 125 is provided between the discharge side of the compressor 2 and the inlet side of the condenser 3, and constitutes a pressure detection means for detecting the discharge refrigerant pressure Pd of the compressor 2. ing. The flow rate detection device 30 will be described later. Note that the discharge refrigerant pressure Pd of the compressor 2 means the refrigerant pressure between the discharge port of the compressor 2 and the refrigerant inlet of the expansion valve 5.

  As various air-conditioning operation switches SW provided on the air-conditioning operation panel 126, an air-conditioner switch that outputs an operation command signal for the compressor 2, a blow-out mode switch that sets a blow-out mode, an auto switch that outputs a command signal for an air-conditioning automatic control state, a vehicle interior A temperature setting switch or the like serving as temperature setting means for setting the temperature is provided.

  Next, the electromagnetic clutch 9, the blower fan 12 of the evaporator 6 and the like are connected to the output side of the microcomputer of the air conditioner control unit 100a through drive circuits (not shown) for driving various actuators which are peripheral circuits. Is done. The operation of these various actuators 9 and 12 is controlled by the output signal of the air conditioner control unit 100a.

  The air conditioner control unit 100a is connected to the vehicle-side engine control unit 100b, and both the control units 100a and 100b can input and output signals between each other.

  The engine control unit 100b controls the fuel injection amount, ignition timing, and the like to the vehicle engine 11 to optimum values based on sensor detection signals from an engine sensor group that detects the driving state of the vehicle engine 11 and the like as is well known. To do.

  The engine control unit 100b stores a control program in the ROM of the microcomputer, and performs various arithmetic processes based on the control program. Here, the engine sensor group is provided with an engine speed sensor 127 and the like for detecting the engine speed Ne. The engine speed sensor 127 corresponds to engine speed detection means.

  Next, a schematic configuration of the compressor 2 used in the present embodiment will be described with reference to FIGS. 2 is a schematic configuration diagram illustrating a schematic configuration of the compressor 2 of the present embodiment, FIG. 3 is a schematic diagram of a flow rate detection unit of the flow rate detection device, and FIG. 4 is an output voltage and compression of a magnetic flux density sensor of the flow rate detection device. It is a control characteristic figure which linked | related the refrigerant | coolant flow rate of the discharge side of a machine.

  The compressor 2 of the present embodiment uses a known fixed capacity compressor, and specifically, various compression mechanisms such as a scroll compressor and a vane compressor can be employed. The compressor 2 includes a housing 20 having a suction port 21 for sucking refrigerant on the downstream side of the evaporator 6 and a discharge port 22 for discharging refrigerant compressed in a compression chamber 26 described later.

  A suction passage 25 that connects the suction port 21 and the compression chamber 26 and a discharge passage 27 that connects the compression chamber 26 and the discharge port 22 are provided in the housing 20. The refrigerant sucked from the evaporator 6 passes through the suction passage 25 and flows into the compression chamber 26, and the refrigerant compressed in the compression chamber 26 passes through the discharge passage 27 and flows out to the condenser 3.

  In the discharge passage 27 between the compression chamber 26 and the discharge port 22, a flow rate detection device 30 that detects the flow rate of the refrigerant discharged from the compressor 2 is provided. Based on the refrigerant flow rate on the discharge side of the compressor 2 detected by the flow rate detection device 30 and the discharge refrigerant pressure Pd of the compressor 2 detected by the high pressure sensor 125, the first drive torque Trk1 of the compressor 2 is calculated. Is done.

  The first drive torque Trk1 is calculated by the electric control unit 100 (engine control unit 100b), and the engine output is controlled based on the first drive torque Trk1, so that the engine rotation is performed even if the drive torque of the compressor 2 changes. The number Ne is not changed.

  The flow rate detection device 30 includes a throttle unit 31 that generates a pressure loss (front / rear differential pressure) in the discharge refrigerant in the discharge passage 27, and a flow rate detection unit that detects the flow rate of the refrigerant discharged from the compressor 2 based on the differential pressure across the throttle unit 31. 32 or the like. The flow rate detection unit 32 constitutes a flow rate detection unit.

  Here, the upstream side refrigerant passage 33 formed to branch from the discharge passage 27 between the compression chamber 26 and the throttle portion 31, and the branch from the discharge passage 27 between the throttle portion 31 and the discharge port 22. The downstream refrigerant passage 34 formed as described above is connected to the flow rate detection unit 32.

  Next, the flow rate detection unit 32 will be described with reference to FIG. A cylindrical storage chamber 35 connected to the upstream refrigerant passage 33 and the downstream refrigerant passage 34 is formed in the housing 20 of the compressor 2. The storage chamber 35 stores a spool 36 that is slidable in the vertical direction in FIG.

  A magnetic body 37 such as a magnet is embedded in the upper end portion 36a on the upper side of the spool 36 in FIG. Also, the lower end 36 b on the lower side of the spool 36 in FIG. 3 is formed to have the same diameter as the storage chamber 35 so that the storage chamber 35 can slide.

  The spool 36 includes first and second springs between the upper wall portion 35 a of the storage chamber 35 and the upper end portion 36 a of the spool 36 and between the lower wall portion 35 b of the storage chamber 35 and the lower end portion 36 b of the spool 36. 38 and 39 are interposed to determine the balance position of the spool 36.

Here, the spool 36 of the present embodiment has a balance position (non-fixed initial position) at a position where the upper end portion 36a of the spool 36 contacts the upper wall portion 35a of the storage chamber 35 by the first and second springs 38 and 39. Is set. The non-sticking initial position H _S is the compressor 2 is the initial position of the spool 36 at the time of non-operation that has been stopped.

  In the storage chamber 35, an upstream communication port 35 c is formed in the upper region 40 of the upper end portion 36 a of the spool 36, and a downstream communication port 35 d is formed in the lower region 41 of the lower end portion 36 b of the spool 36.

  The upstream side communication port 35 c is connected to the upstream side refrigerant passage 33 so that the refrigerant on the upstream side of the throttle portion 31 flows through the upper region 40 in the storage chamber 35. Further, the downstream side communication port 35 d is connected to the downstream side refrigerant passage 34, and the refrigerant on the downstream side of the throttle portion 31 flows through the lower region 41 in the storage chamber 35.

  Therefore, the spool 36 in the storage chamber 35 has a differential pressure between the pressure of the refrigerant flowing through the upstream refrigerant passage 33 applied to the upper end portion 36a and the pressure of the refrigerant flowing through the downstream refrigerant passage 34 applied to the lower end portion 36b. Move up or down.

In this embodiment, since the fixed capacity type compressor is used, the flow rate of the refrigerant discharged from the compressor 2 changes when the compressor 2 is started, for example, when the refrigerant pressure Pd discharged from the compressor 2 changes. differential pressure is changed according to 36, the spool 36 moves in response to the pressure difference at the bottom of FIG. 3 (a direction away from the non-sticking initial position H _S).

  On the other hand, a magnetic flux density sensor 42 such as a Hall element or an MI sensor is disposed outside the housing 20. The magnetic flux density sensor 42 is disposed so as to face the upper side wall portion 35 a of the storage chamber 35 so as to face the magnetic body 37 embedded in the spool 36 with a gap with respect to the housing 20.

  The magnetic flux density sensor 42 is configured to output an electrical detection signal (output voltage) corresponding to the magnetic flux density generated in the magnetic body 37 to the control device 100. Here, the output voltage value output by the magnetic flux density sensor 42 corresponds to the position of the spool 36, and the magnetic flux density sensor 42 constitutes a position detecting means for detecting the position of the spool 36.

  Further, the air conditioner control unit 100a stores in advance a control characteristic diagram (control map) in which the relationship between the output voltage of the magnetic flux density sensor 42 and the refrigerant flow rate as shown in FIG. 4 is associated, and based on this control characteristic diagram. The flow rate of the refrigerant discharged from the compressor 2 is detected. The control map is a control characteristic based on information obtained in advance through experiments or the like.

  Here, the position H of the spool 36 of the present embodiment is based on the lower wall portion 35b of the storage chamber 35 as a reference (zero) as shown in FIG. 3, and the upper end portion 36a of the spool 36 from the lower wall portion 35b of the storage chamber 35. It is prescribed by the height up to.

Specifically, when the spool 36 moves downward, the position H of the spool 36 decreases, and when the spool 36 moves upward, the position of the spool 36 increases. In the present embodiment, it becomes highest position the position of the spool 36 is in the non-fixed initial position H _S. The non-sticking initial position H _S of the spool 36, may be changed as appropriate and not the position of the spool 36 is limited to the highest becomes position.

  Next, control processing executed by the electric control unit 100 in the present embodiment will be described. First, the sticking determination control performed before starting the compressor will be described with reference to FIGS. Here, FIG. 5 shows a flowchart of the spool sticking determination control of the present embodiment. FIG. 6A shows the state of the flow rate detection device 30 when the spool is not fixed, and FIG. 6B shows the state of the flow rate detection device 30 when the spool is fixed. Yes.

  The sticking determination control of the present embodiment is performed before the compressor 2 is started (when not operating). Here, the flowchart shown in FIG. 5 responds to an operation signal from the air conditioning operation switch SW in a state where the ignition switch of the vehicle engine 11 is turned on and power is supplied from the battery B (not shown) to the electric control unit 100. And start.

First, in step S10, it is determined whether or not the air conditioner switch is turned on. When the air conditioner switch is turned on, initial values of various sensors are detected in step S20. In this embodiment, the magnetic flux density sensor 42 detects the initial detection position H ₀ of the spool 36 before the compressor 2 is started.

Next, in step S30, it determines whether or not the initial detection position H ₀ of the spool 36 is in the position higher than the first reference position H _A. Before starting the compressor, the refrigerant does not circulate in the cycle, and no pressure loss occurs in the throttle portion 31 on the discharge side of the compressor 2.

Therefore, when the spool 36 is not fixed, as shown in FIG. 6 (a), in a state in which the spool 36 is first, which is biased in the non-fixed initial position H _S by the second spring 38 and 39 ing. Here, the first reference position H _A is set in advance in the vicinity of the non-fixed initial position H _S in consideration of the detection accuracy of the magnetic flux density sensor 42 (non-fixed initial position H _S ≧ first reference position H _A). ) Stored in the ROM of the air conditioner control unit 100a.

On the other hand, when the spool 36 is fixed at a position other than the vicinity of the non-fixed initial position H _S , as shown in FIG. 6B, the initial detection position H ₀ of the spool 36 before starting the compressor is a position away from the non-stick initial position H _S (a position lower than the first reference position H _a).

Accordingly, the initial detection position H ₀ of the spool 36, that when a position lower than the first reference position H _A determines that the spool 36 is stuck at a position other than the unfixed initial position H _S it can.

Returning to FIG. 5, if it is determined in step S30 that the initial detection position H ₀ is higher than the first reference position _HA, it can be determined in step S40 that the spool 36 is not fixed. And the compressor 2 is started by step S50.

On the other hand, if it is determined in step S30 that the initial detection position H ₀ is lower than the first reference position _HA, it can be determined in step S60 that the spool 36 is fixed. When the spool 36 is fixed, the accurate flow rate of the refrigerant cannot be detected by the flow rate detection device 30 when the compressor 2 is operated, and the accurate first drive torque Trk1 cannot be calculated. Therefore, the engine output becomes unstable. An engine stall may occur. Therefore, it progresses to step S70 and the compressor 2 is not started.

As described above, according to the configuration of the present embodiment, before the compressor is started (when the compressor 2 is not in operation), the initial detection position H ₀ of the spool 36 is the first relative to the non-adhesion initial position H _S. If the spool 36 is located farther than the one reference position _HA, it can be determined that the spool 36 is fixed at a position other than the vicinity of the non-fixed initial position Hs.

  Thereby, the sticking determination of the spool 36 in the flow rate detection device 30 can be performed before the compressor is started. Further, when it is determined that the spool 36 is fixed, the compressor 2 is not started, so that problems such as engine stall caused by the fixation of the spool 36 can be avoided in advance.

  In the present embodiment, a fixed capacity compressor is adopted as the compressor 2, but the present invention is not limited to this. For example, a variable capacity compressor whose discharge capacity can be varied is adopted as the compressor 2. be able to.

(Second Embodiment)
Next, a second embodiment of the present invention will be described with reference to FIGS. Parts that are the same as or equivalent to those in the first embodiment are given the same reference numerals, and descriptions thereof are omitted.

  In the first embodiment, the example in which the fixed capacity side compressor is employed as the compressor 2 and the sticking determination control is performed before the compressor 2 is activated has been described. However, in the present embodiment, the compressor 2 has a variable capacity. An example in which a type compressor is employed and the sticking determination control is performed after the compressor 2 is started will be described.

  First, the compressor 2 of the present embodiment will be described. The compressor 2 is a known swash plate type configured such that the discharge capacity can be continuously changed by a control signal (control current I) output from the air conditioner control unit 100a. A variable capacity compressor is used. The discharge capacity is the geometric volume of the working space where the refrigerant is sucked and compressed, that is, the cylinder volume between the top dead center and the bottom dead center of the piston stroke.

  Specifically, the compressor 2 includes a swash plate chamber (not shown) for introducing suction refrigerant and discharge refrigerant, and an electromagnetic capacity control valve (not shown) for adjusting the ratio of suction refrigerant and discharge refrigerant to be introduced into the swash plate chamber. ), And a swash plate (not shown) for displacing the inclination angle in accordance with the pressure in the swash plate chamber. The piston stroke (discharge capacity) is changed according to the inclination angle of the swash plate.

  The electromagnetic capacity control valve is opposed to a pressure responsive mechanism that generates a force due to a differential pressure between the suction refrigerant pressure (low pressure side pressure) and the discharge refrigerant pressure (high pressure side pressure) of the compressor 2, and the force due to this differential pressure. It incorporates an electromagnetic mechanism that generates electromagnetic force, and adjusts the valve opening (ratio of suction refrigerant to discharge refrigerant) by changing the balance between the force due to the differential pressure and the electromagnetic force, thereby changing the pressure in the swash plate chamber.

  Further, the electromagnetic force of the electromagnetic mechanism of the electromagnetic capacity control valve is determined by the control current I output from the air conditioner control unit 100a. When the control current I is increased, the pressure in the swash plate chamber decreases and the swash plate tilts. The angle increases. Thereby, piston stroke (discharge capacity) increases.

  Conversely, when the control current I is decreased, the pressure in the swash plate chamber increases and the tilt angle of the swash plate decreases. Thereby, piston stroke (discharge capacity) decreases. In the present embodiment, the electromagnetic capacity control valve constitutes a variable capacity mechanism.

  The output of the control current I is usually a method of changing by duty control due to the configuration of the current control circuit, but the value of the control current I is directly and continuously (analog) regardless of duty control. May be changed. In this way, by adjusting the control current I, the compressor 2 can continuously change the discharge capacity in a range of approximately 0% to 100%.

  Next, the sticking determination control of the spool 36 according to the present embodiment will be described with reference to FIGS. Here, FIG. 7 shows the state of the discharge capacity of the compressor 2 determined by the relationship between the suction refrigerant pressure of the compressor 2 and the control current I, and FIG. 8 is a flowchart of the spool sticking determination control in this embodiment. Show. FIG. 9A shows the state of the flow rate detection device when the spool is not fixed, and FIG. 9B shows the state of the flow rate detection device when the spool is fixed.

  The operation of the compressor 2 of the present embodiment has a relationship in which the discharge capacity increases as the control current I increases as described above, and the discharge capacity decreases as the control current I decreases, as shown in FIG. The discharge capacity of the compressor 2 does not change unless the control current I increases beyond a predetermined current.

  That is, in the region where both the control current I and the suction refrigerant pressure in FIG. 7 are high (the upper region of the solid line in the figure), the discharge capacity of the compressor 2 is 100% (maximum discharge capacity), and on the solid line, the discharge capacity is It becomes a state (variable range) that can be varied between 0 and 100%. Further, in a region where the control current I is low and the suction refrigerant pressure is high, a region where the control current I is high and the suction refrigerant pressure is low, and a region where both the control current I and the suction refrigerant pressure are low, the discharge capacity of the compressor 2 is approximately 0% ( Minimum discharge capacity).

  Therefore, unless the control current I is increased beyond a predetermined current, the refrigerant is not compressed by the compressor 2 and the compressor 2 is substantially stopped. Thus, in a state where the compressor 2 is substantially stopped, the refrigerant does not circulate in the refrigeration cycle apparatus 1, so that no pressure loss (differential pressure) occurs in the throttle portion 31 and the spool 36 does not move. Become.

  Next, the sticking determination control of the spool 36 according to the present embodiment will be described with reference to the flowchart of FIG. 8. In step S100, it is determined whether or not the air conditioner switch is turned on. In S110, initial values of various sensors are detected.

  Next, in step S120, the control current I is output to the electromagnetic capacity control valve of the compressor 2 to start the compressor 2. Here, the control current I output to the electromagnetic capacity control valve of the compressor 2 is the target evaporator temperature at which the evaporator temperature Te detected by the evaporator temperature sensor 121 is the target value of the degree of cooling of the evaporator 5. It is calculated by known feedback control (PI control) so as to approach TEO.

  The target evaporator temperature TEO is calculated by a well-known method, and the target blowout temperature TAO of the air blown into the vehicle interior based on the vehicle interior target temperature, the internal air temperature, and the external air temperature set by the temperature setting switch is calculated. After the calculation, the target evaporator temperature TEO is calculated based on the calculated target blowing temperature TAO.

After starting the compressor 2 in step S120, the control current I output to the electromagnetic capacity control valve of the compressor 2 is detected in step S130. Then, in step S140, it determines whether or not the control current I exceeds the first predetermined current _{I A.} The detected value of the control current I uses the output value from the air conditioner control 100a.

Here, as shown in FIG. 7, the first predetermined current _{I A,} around the minimum pressure value of refrigerant suction pressure in the refrigeration cycle apparatus 1 (e.g., 0.1 MPaG) in the displacement of the compressor 2 is 100% Is set to a control current (for example, 0.7 A or more). Therefore, the control current output to the electromagnetic capacity control valve of the compressor 2 is in the case above a first predetermined current I _A is reliably discharge capacity of the compressor 2 is 100%.

Returning to FIG. 8, when the control current I in step S140 is determined to have exceeded the first predetermined current _{I A,} Start first timer in step S150, the counted _{T 1} first timer period in step S160. When the first timer is in operation at the time of the determination in step S140, skipping step S150 to count a first timer time _{T 1} proceeds to step S160.

The first timer time _{T 1} is determined whether exceeds a predetermined time _{T C} in step S170, in step S170, when the first timer period _{T 1} is exceeded a predetermined time _{T C,} the flow proceeds to step S190.

That is, when the control current I exceeds the first predetermined current _{I A} continuous predetermined time _{T C,} the flow proceeds to step S190. Incidentally, when the control current I in step S140 does not exceed the first predetermined current _{I A,} first clears the timer time _{T 1} at step S180, and stops the operation of the first timer, the flow returns to step S130.

Here, the predetermined time T _C is the control current I exceeds a first predetermined current I _A from the output of the electromagnetic capacity control valve, as the time until the discharge capacity of the compressor 2 is actually the maximum discharge capacity Yes. That is, it is a time set in consideration of the follow-up delay of the discharge capacity control of the compressor 2.

The predetermined time T _C, when follow-up accuracy of the discharge capacity control of the compressor 2 is low, for example, is set for about 40 seconds, when follow-up accuracy of the discharge capacity control of the compressor 2 is high, about several seconds Is set. It should be noted that the predetermined time _{T C} is stored in advance in a ROM or the like of the air conditioner control unit 100a.

Next, when the control current I exceeds the first predetermined current I _A continuous predetermined time T _C, in step S190, detects the position H of the compressor 2 after starting of the spool 36 by a magnetic flux density sensor 42. The detection position H of the spool 36 in step S200 it is determined whether or not a position higher than the second reference position H _B.

Here, the second reference position H _B is to remove detection error of the magnetic flux density sensor 42, is preset in the vicinity of the non-fixed initial position H _S, it is stored in the ROM or the like of the air conditioner control unit 100a. The second reference position H _B may be the same position as the first reference position H _A in the first embodiment, or may be a different position.

After the compressor startup, when it exceeds a first predetermined current I _A is next discharge capacity of 100% of the compressor 2, the cycle circulates the refrigerant, the pressure loss in the throttle portion 31 on the discharge side of the compressor 2 appear.

Therefore, when the spool 36 is not fixed, as shown in FIG. 9 (a), the detection position H of the spool 36, a position away from the vicinity of the non-stick initial position H _S (second reference position H _B Lower position).

On the other hand, the spool 36, if you are stuck in the vicinity of the non-stick initial position H _S, as shown in FIG. 9 (b), the detection position H of the spool 36, in the vicinity of the non-sticking initial position H _S position to become (second reference position H higher than _B).

Therefore, when the detection position H of the spool 36 is in the vicinity of the non-fixed initial position H _S , that is, in a position higher than the second reference position H _B , the spool 36 is fixed in the vicinity of the non-fixed initial position H _S. Can be determined.

Returning to Figure 7, the detection position H of the spool 36 in step S200 may not be determined to a position higher than the second reference position H _B determines that the spool 36 is not fixed in step S210, the sticking determination control finish. If it is determined in step S210 that the spool 36 is not fixed, the process may return to step S130 and repeat fixing determination control may be performed.

On the other hand, it judged that the detecting position H of the spool 36 in step S200 is the case where it is determined that a position higher than the second reference position H _B, the spool 36 in step S220 has stuck in non-stick initial position H _S near To do. In this case, the accurate first drive torque Trk1 cannot be estimated, and the engine output may become unstable and engine stall may occur. Therefore, the process proceeds to step S230, the compressor 2 is stopped, and the sticking determination is made. End control.

As described above, according to this embodiment, after the compressor starts (during the operation of the compressor 2), detecting the position H of the spool 36 is greater than the second reference position H _B from the non-fixed initial position H _S It can be determined that the spool 36 is fixed in the vicinity of the non-fixed initial position HS.

  Thereby, the sticking determination of the spool 36 in the flow rate detection device 30 can be performed. Further, when it is determined that the spool 36 is fixed, the compressor 2 is stopped, so that it is possible to avoid problems such as engine stall caused by the fixation of the spool 36.

(Third embodiment)
Next, a third embodiment of the present invention will be described with reference to FIG. The same or equivalent parts as those in the first and second embodiments are denoted by the same reference numerals, and the description thereof is omitted. Here, FIG. 10 shows a flowchart of the spool sticking determination control in this embodiment.

In the second embodiment, the freeze determining control of the spool 36, the spool 36 but is determined that they are fixed with non-stick initial position H _S near the position spool 36 is non-unbonded initial position H _S near It is not judged that it is stuck.

In the present embodiment, the freeze determining control of the spool 36, with the spool 36 to determine that they are fixed with non-stick initial position H _S near the spool 36 is fixed at a position other than the unfixed initial position H _S near Judge that it is.

Specifically secured determination control of the present embodiment, as shown in FIG. 10, the control current I in step S140 is determined not to exceed the first predetermined current I _A, a first timer time T ₁ at step S180 After clearing and stopping the operation of the timer, the process proceeds to step S240.

Then, it is determined whether or not the control current I in step S240 is below the second predetermined current I _B. Here, as shown in FIG. 7, the second predetermined current _{I B} is close to the maximum pressure value of refrigerant suction pressure in the refrigeration cycle apparatus 1 (e.g., 0.35MPaG) in the discharge capacity of the compressor 2 and 0% Is set to a control current (for example, 0.2 A or less). Therefore, the control current output to the electromagnetic capacity control valve of the compressor 2 is in the case below a first predetermined current I _B is reliably discharge capacity of the compressor 2 is 0%.

Returning to FIG. 10, when the control current I in step 240 is below a second predetermined current _{I B,} starting a second timer in Step S250, to the second counting timer time _{T 2} at step S260. When the second timer is in operation at the time of the determination in step S240, the process proceeds to step S260 by skipping step S250, it counts the _{T 2} second timer times.

Then, in step S270, it determines the second timer time _{T 2} is whether exceeds a predetermined time _{T C.} If in step S270 the second timer time _{T 2} does not exceed the predetermined time _{T C,} the flow returns to step S130, if the second timer time _{T 2} exceeds the predetermined time _{T C,} the flow proceeds to step S290.

Here, when the control current I in step S240 is not below the second predetermined current _{I B,} the second clears the timer time _{T 2} at step S280, and stops the operation of the second timer, the flow returns to step S130. Further, in step S140, even when the control current I exceeds the first predetermined current IA, second clears the timer time _{T 2} at step S141, stops the operation of the second timer.

Then, if the second timer time _{T 2} exceeds the predetermined time _{T C,} in step S290, it detects the position H of the compressor 2 after starting of the spool 36 by a magnetic flux density sensor 42. In step S300, it is determined whether or not the detected position H of the spool 36 is higher than the first reference position _HA .

If it is determined in step S300 that the detected position H of the spool 36 is higher than the first reference position _HA , it is determined in step S310 that the spool 36 is not fixed, and the fixing determination control is terminated. When it is determined in step S310 that the spool 36 is not fixed, the process may return to step S130 and repeat fixing determination control may be performed.

On the other hand, when the detection position H of the spool 36 is not determined position higher than the first reference position H _A in step S300, the spool 36 in step S220 is determined to be fixed outside the unfixed initial position H _S In step S230, the compressor 2 is stopped, and the sticking determination control is ended.

Thus, when the discharge capacity of the compressor 2 becomes maximum discharge capacity, a minimum discharge capacity, by performing the fixing determination control of the spool 36, the spool 36 is fixed in a non-fixed initial position H _S near together with judges, it can spool 36 to determine that they are stuck in a position other than the unfixed initial position H _S vicinity.

(Fourth embodiment)
Next, a fourth embodiment of the present invention will be described with reference to FIG. The same or equivalent parts as those in the first to third embodiments are denoted by the same reference numerals, and the description thereof is omitted. Here, FIG. 11 shows a flowchart of spool sticking determination control in this embodiment.

  In the present embodiment, a variable displacement compressor is employed as the compressor 2, and the electromagnetic capacity of the compressor 2 is forcibly applied when the engine speed Ne fluctuates more than a reference fluctuation amount with respect to the reference engine speed Neo. The control current I output to the control valve is changed to determine whether the spool 36 is stuck. Here, the engine 11 is controlled by the engine control unit 100b so that the engine speed Ne is maintained at the reference engine speed Neo even when the first drive torque Trk1 of the compressor 2 varies.

  Specifically, the sticking determination control of the present embodiment will be described with reference to FIG. 11. First, in step S400, it is determined whether or not the air conditioner switch is turned on. If the air conditioner switch is turned on, in step S410, The initial values of various sensors are detected.

  Next, in step S420, the control current I is output to the electromagnetic capacity control valve of the compressor 2 to start the compressor 2. In step S430, the position H of the spool 36 is detected by the magnetic flux density sensor 42.

  In step S440, the discharge refrigerant flow rate G of the compressor 2 is calculated based on the detection position H of the spool 36. In step S450, the high pressure sensor 125 detects the discharge refrigerant pressure Pd of the compressor 2.

  Next, in step S460, the second refrigerant flow of the compressor 2 is calculated from the discharge refrigerant flow rate G of the compressor 2 calculated based on the detection position H of the spool 36 and the discharge refrigerant pressure Pd of the compressor 2 detected by the high pressure sensor 125. One drive torque Trk1 is calculated. Here, step S460 corresponds to the first drive torque estimating means of the present invention.

Specifically, the first drive torque Trk1 is calculated by the following mathematical formulas F1 and F2.
L = (κ / κ−1) × Psc × G × {(Pd / Psc) ^{(κ−1 / κ)} −1} (F1)
Trk1 = L / Nc (F2)
Formula F1 is an expression generally used to calculate the power consumption L of the compressor 2, κ is an adiabatic index, and Psc is a low-pressure side pressure (compressor 2 when the refrigeration cycle is operating normally). Is a representative value (fixed value). Nc in Formula F2 is the rotational speed of the compressor 2 and can be calculated by multiplying the engine rotational speed Ne by the pulley ratio.

  Next, in step S470, the engine output is controlled based on the first drive torque Trk1. Here, as described above, the engine output is controlled so that the engine speed Ne approaches the target reference engine speed Neo even if the first drive torque Trk1 of the compressor 2 changes. Here, the target reference engine speed Neo is set, for example, between 600 and 800 rpm when the vehicle is idle.

  Next, at step S480, the engine speed sensor 127 detects the actual engine speed Ne. In step S490, it is determined whether or not the difference (absolute value) between the actual engine speed Ne and the reference engine speed Neo exceeds the reference fluctuation amount. Here, the reference variation amount is obtained experimentally and is stored in advance in the ROM or the like of the engine control unit 100b.

  When the difference (absolute value) between the actual engine speed Ne and the target reference engine speed Neo exceeds the reference fluctuation amount, the calculated first drive torque Trk1 is greater than the actual drive torque of the compressor 2. It is expected that the engine rotational speed abnormality state greatly deviating, that is, the discharged refrigerant flow rate G of the compressor 2 that calculates the first drive torque Trk1 deviates from the actual refrigerant flow rate.

  Therefore, it can be predicted that there is a high possibility that the spool 36 of the flow rate detection device 30 is fixed. Here, in this embodiment, the control processing from step S460 to step S490 is performed by the engine control unit 100b, and the control processing of other steps is performed by the air conditioner control unit 100a. Therefore, transmission / reception of the discharge refrigerant flow rate G of the compressor 2 and the determination result in step S490 and the like is performed between the air conditioner control unit 100a and the engine control unit 100b.

Next, if it is determined in step S490 that the difference (absolute value) between the actual engine speed Ne and the reference engine speed Neo exceeds the reference fluctuation amount, compression is forcibly performed in steps S500 and 510. the control current I is output to the electromagnetic capacity control valve of the machine 2 is gradually increased to above a first predetermined current I _a.

Then, when the control current I exceeds the first predetermined current I _A, detects the position H of the compressor 2 after starting of the spool 36 by a magnetic flux density sensor 42 in step S520. Here, in consideration of the follow-up of the discharge capacity control of the compressor 2, after the control current I exceeds the first predetermined current I _A, may detect the position of the spool 36 after the predetermined time T _C lapse .

Next, the detection position H of the spool 36 in step S530 it is determined whether or not a position higher than the second reference position H _B. Detection position H of the spool 36 in step S530 is the case where it is determined that a position higher than the second reference position H _B, the spool in the step S540 is determined to be fixed in a non-fixed initial position H _S vicinity. In this case, it progresses to step S550, the compressor 2 is stopped, and sticking determination control is complete | finished.

On the other hand, in step S530, if the detected position H of the spool 36 is not determined to be higher position than the second reference position _{H B,} the process proceeds to step S560,570. In step S560,570, contrary to step S500,510, the control current I to be outputted to the electromagnetic capacity control valve of forced compressor 2 is gradually reduced to below the second predetermined current _{I B.}

When the control current I in step S570 is below a second predetermined current _{I B,} detects the position H of the compressor 2 after starting of the spool 36 by a magnetic flux density sensor 42 in step S580. Here, in consideration of the follow-up of the discharge capacity control of the compressor 2, after the control current I is below a second predetermined current I _B, it may detect the position of the spool 36 after the predetermined time T _C lapse .

In step S590, it is determined whether or not the detected position H of the spool 36 is higher than the first reference position _HA .

If it is determined in step S590 that the detected position H of the spool 36 is higher than the first reference position _HA , it is determined in step S600 that the spool 36 is not fixed, and the process returns to step S430. When it is determined in step S600 that the spool 36 is not fixed, the sticking determination control may be terminated.

On the other hand, when the detection position H of the spool 36 in step S590 may not be determined to a position higher than the first reference position H _A, the spool 36 is stuck at a position other than the unfixed initial position H _S vicinity at step S540 to decide. In this case, it progresses to step S550, the compressor 2 is stopped, and sticking determination control is complete | finished.

Thus, in the present embodiment, when the engine speed Ne is in an abnormal engine speed state that fluctuates more than the reference fluctuation amount with respect to the reference engine speed Neo, the refrigerant detected by the flow rate detection device 30 since the flow rate is likely to be an abnormal value, the control current I to be outputted to the electromagnetic capacity control valve, forced gradually increased to above a first predetermined current I _a, the flow rate of refrigerant circulating in the cycle Increasing.

Thus, the control current I, since above a reliable first predetermined current I _A, it is possible to determine whether the spool 36 is fixed in a non-fixed initial position H _S near aggressively. In the present embodiment, the control current I, but is gradually increased to above a first predetermined current I _A, simply increasing the control current I calculated by the feedback control, the first predetermined current I _A It may be configured to determine whether or not the spool 36 is stuck when it exceeds the maximum.

Moreover, after increasing the control current I, when the detection position H of the spool 36 is at a position lower than the second reference position H _B (if the spool 36 is not fixed in a non-fixed initial position H _S vicinity) forcibly gradually reduced to below the second predetermined current H _B, which reduces the flow rate of refrigerant circulating in the cycle.

Thus, the control current I, since below reliably second predetermined current I _B, can be spool 36 is performed positively determined whether or not fixed at a position other than the unfixed initial position H _S near .

In the present embodiment, the control current I, but is gradually reduced to below the second predetermined current I _B, simply reduces the control current I calculated by the feedback control, the second predetermined current I _B It may be configured to determine whether the spool 36 is stuck or not when it falls below.

  Further, in the present embodiment, the determination of the fixation of the spool 36 is performed only when the engine rotational speed is abnormal. However, since the determination of the fixation of the spool 36 can be performed in accordance with the state of the engine 11, the spool 36 The efficiency of the 36 sticking determination can be improved. Of course, it is also possible to determine whether the spool 36 is stuck when the engine speed is not abnormal.

(Fifth embodiment)
Next, a fifth embodiment of the present invention will be described with reference to FIGS. The same or equivalent parts as those in the first to third embodiments are denoted by the same reference numerals, and the description thereof is omitted. Here, FIG. 12 shows a flowchart of the spool sticking determination control in this embodiment, and FIG. 13 shows the control current I output to the electromagnetic capacity control valve of the compressor 2, the discharge refrigerant pressure Pd of the compressor 2, and the like. The control characteristic which linked | related the power L of the compressor 2 is shown.

  In the present embodiment, a variable displacement compressor is employed as the compressor 2, and the first driving torque Trk1 calculated based on the discharge refrigerant flow rate G and the discharge refrigerant pressure Pd of the compressor 2 and the discharge refrigerant pressure Pd of the compressor 2 are used. And when the difference from the second drive torque Trk2 calculated based on the control current I output to the electromagnetic capacity control valve exceeds the reference value, it is forcibly output to the electromagnetic capacity control valve of the compressor 2 The control current I to be changed is changed to determine whether the spool 36 is stuck.

  Specifically, the sticking determination control according to the present embodiment will be described with reference to FIG. 12. After the discharge refrigerant pressure Pd of the compressor 2 is detected by the high pressure sensor 125 in step S450, the electromagnetic wave of the compressor 2 is detected in step S451. The control current I output to the type capacity control valve is detected.

  Then, in step S460, the first refrigerant of the compressor 2 is calculated from the discharge refrigerant flow rate G of the compressor 2 calculated based on the detection position H of the spool 36 and the discharge refrigerant pressure Pd of the compressor 2 detected by the high pressure sensor 125. A drive torque Trk1 is calculated.

  Next, the second driving torque of the compressor 2 based on the control current I output to the electromagnetic capacity control valve of the compressor 2 and the discharge refrigerant pressure Pd of the compressor 2 detected by the high pressure sensor 125 in step S471. Trk2 is calculated. Here, step S471 corresponds to the second drive torque estimating means of the present invention.

  The calculation method of the second drive torque Trk2 will be described. First, the power consumption L of the compressor 2 is calculated based on the control current I, the discharge refrigerant pressure Pd of the compressor 2, and the control characteristic diagram shown in FIG. Then, the second driving torque Trk2 is calculated by substituting the calculated power consumption L of the compressor 2 into the formula F2 (Trk2 = L / Nc) of the fourth embodiment.

  Here, the control characteristic diagram of FIG. 13 is obtained experimentally, and is stored in advance in the ROM or the like of the engine control unit 100b. According to the control characteristic diagram, the power consumption L of the compressor 2 increases as the control current I increases, and the power consumption L of the compressor 2 increases as the discharge refrigerant pressure Pd increases.

  Returning to FIG. 12, it is determined in step S491 whether or not the difference (absolute value) between the first drive torque Trk1 and the second drive torque Trk2 exceeds the reference value. Here, the reference value is obtained experimentally and stored in advance in the ROM or the like of the engine control unit 100b.

  When the difference between the first drive torque Trk1 and the second drive torque Trk2 exceeds a reference value, the calculated drive torque estimation abnormal state in which the calculated first drive torque Trk1 greatly deviates from the second drive torque Trk2, That is, it is expected that the discharge refrigerant flow rate G of the compressor 2 that calculates the first drive torque Trk1 deviates from the actual refrigerant flow rate.

  Therefore, it can be predicted that there is a high possibility that the spool 36 of the flow rate detection device 30 is fixed. Here, in this embodiment, the control process from step S460 to step S491 is performed by the engine control unit 100b, and the control process of other steps is performed by the air conditioner control unit 100a.

Next, when it is determined in step S491 that the difference (absolute value) between the first driving torque Trk1 and the second driving torque Trk2 exceeds the reference value, the compressor 2 is forcibly forced in steps S500 and 510. the control current I to the output of the electromagnetic capacity control valve is gradually increased to above a first predetermined current I _a.

  As described above, when the estimated difference between the first driving torque Trk1 and the second driving torque Trk2 exceeds the reference value, the refrigerant flow detected by the flow rate detection device 30 is an abnormal value. Since there is a high possibility, the control current I output to the electromagnetic capacity control valve is forcibly increased or decreased to increase or decrease the flow rate of the refrigerant circulating in the cycle.

  Thereby, since it can carry out according to the state of the 1st drive torque Trk1 which controls an engine output, the efficiency improvement of the sticking determination of the spool 36 can be aimed at.

(Sixth embodiment)
Next, a sixth embodiment of the present invention will be described with reference to FIG. Parts that are the same as or equivalent to those in the fourth embodiment are given the same reference numerals, and descriptions thereof are omitted. Here, FIG. 14 shows a flowchart of the spool sticking determination control in the present embodiment.

In the fourth embodiment, in step S500,510, the control current I, is gradually increased to above a first predetermined current _{I A,} in step S560,570, the control current I, a second predetermined current _{I B} It gradually decreases until it falls below.

In the present embodiment, as shown in FIG. 14, first, at step S501, and outputs the control current I, the electromagnetic volume control valve is changed to a value above a first predetermined current I _A. At this time, by operating a timer to measure the elapsed time from outputting the control current I values above a first predetermined current I _A to the electromagnetic displacement control valve.

Then, in step S511, when the timer time T is determined whether a predetermined time has elapsed T _C, has passed a predetermined time T _C, the flow proceeds to step S520, it detects the position H of the spool 36. Note that the timer time T is cleared when the process proceeds to step S520.

Further, in step S561, the control current I, and changed to a value above a second predetermined current I _B is output to the electromagnetic volume control valve, this time, by operating the timer, the second electromagnetic volume control valve measuring an elapsed time from outputting the control current I values above a predetermined current I _B.

Then, in step S571, when the timer time T is determined whether a predetermined time has elapsed T _C, has passed a predetermined time T _C, the flow proceeds to step S580, it detects the position H of the spool 36. Note that the timer time T is cleared when the process proceeds to step S580.

As described above, when the engine speed is abnormal, the control current I can be forcibly changed to the first predetermined current I _A and the second predetermined current I _B to determine whether the spool 36 is stuck. . In addition, you may apply the control content of this embodiment when it becomes the drive torque estimation abnormal state demonstrated in 4th Embodiment.

(Other embodiments)
The present invention is not limited to the above-described embodiment, and can be variously modified as follows.

  (1) In the first embodiment described above, the determination of the fixation of the spool 36 before the start of the compressor is performed. In the second to sixth embodiments, the determination of the fixation of the spool 36 after the start of the compressor is performed. When a variable capacity compressor is employed as the machine 2, the sticking determination control of the first embodiment and the sticking judgment control of the second to sixth embodiments can be appropriately combined.

  For example, the sticking determination control before starting the compressor shown in the first embodiment may be performed, and when it is determined that the spool 36 is not stuck, the sticking judgment of the spool 36 after starting the compressor may be performed. Specifically, after the compressor 2 is started in step S50 in FIG. 1, the process may proceed to step S130 in FIG. 9, step S430 in FIG.

(2) In the fourth to sixth embodiments described above, the freeze determining control of the spool 36, forcibly increases the control current I, the detection position H of the spool 36 is at a position lower than the second reference position H _B If there is (when the spool 36 is not fixed), the control current I is forcibly decreased, but the present invention is not limited to this.

For example, forcibly increases the control current I, when the detection position H of the spool 36 is at a position lower than the second reference position H _B, without reducing the control current I forced spool 36 The sticking determination control may be terminated assuming that it is not sticking.

Further, the control current I is forcibly decreased, and the control current I is forced when the detection position H of the spool 36 is higher than the first reference position _HA (when the spool 36 is not fixed). May be increased. In this case, when the control current I is forcibly decreased and the detection position H of the spool 36 is lower than the first reference position _HA , the control current I is not forcibly increased and the spool 36 The sticking determination control may be terminated assuming that 36 is not sticking.

  (3) In the above-described embodiment, the suction refrigerant pressure of the compressor 2 is directly detected by the high-pressure sensor 125, but is not limited to this. For example, since the outside air temperature Tam detected by the outside air sensor 121 is approximately the same as the refrigerant temperature on the outlet side of the condenser 3, the control map defines the relationship between the outside air temperature and the discharge refrigerant pressure of the compressor 2. Based on this, the discharge refrigerant pressure of the compressor 2 may be detected indirectly.

  Thereby, the discharge refrigerant pressure on the discharge side of the compressor 2 can be detected without providing the high-pressure sensor 125. Here, the outside air temperature sensor 121, the control map, and the like constitute high pressure detection means. The control map may be obtained in advance by experiments or the like and stored in the ROM or the like of the air conditioner control unit 100a.

  (4) In the above-described embodiment, the magnetic flux density sensor 42 is provided as the position detecting means for detecting the position of the spool 36. However, the present invention is not limited to this. For example, the spool 36 is formed by a linear potentiometer. The position may be detected.

  (5) In the above-described embodiment, the storage chamber 35 of the flow rate detection device 30 is configured to be provided in the housing 20 of the compressor 2. However, as a configuration in which a case is installed outside the housing 20 and formed in the case. Also good.

  (6) In the above-described embodiment, a gap is provided between the housing 20 of the compressor 2 and the magnetic flux density sensor 42. However, the two may be in contact with each other.

  (7) In the above-described embodiment, an example in which the refrigeration cycle apparatus 1 of the present invention is applied to a vehicle air conditioner has been described, but the application of the present invention is not limited to this. For example, the present invention may be applied to a commercial refrigeration apparatus, a household refrigerator, and the like.

1 is an overall configuration diagram of a vehicle air conditioner according to a first embodiment. It is a schematic structure figure of the compressor concerning a 1st embodiment. It is a schematic block diagram of the flow volume detection part of the flow volume detection apparatus which concerns on 1st Embodiment. It is a characteristic view which shows the relationship between the output voltage of a magnetic flux density sensor, and the flow volume of the discharge refrigerant | coolant of a compressor. It is a flowchart of the spool sticking determination control according to the first embodiment. It is a state explanatory drawing explaining the state at the time of fixation of a spool. It is a state explanatory drawing explaining the state of the discharge capacity of the compressor defined by the relation between the suction refrigerant pressure of the compressor and the control current. It is a flowchart of the spool sticking determination control according to the second embodiment. It is a state explanatory drawing explaining the state at the time of fixation of a spool. It is a flowchart of the spool sticking determination control according to the third embodiment. It is a flowchart of the spool sticking determination control according to the fourth embodiment. It is a flowchart of the spool sticking determination control according to the fifth embodiment. It is a control characteristic figure which linked | related the discharge refrigerant | coolant pressure of a compressor, control current, and the power consumption of a compressor. It is a flowchart of the spool sticking determination control according to the sixth embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Refrigeration cycle apparatus 2 Compressor 11 Engine 31 Restriction part 32 Flow rate detection part (flow rate detection means)
36 Spool 37 Magnetic body 38 First spring (elastic body)
39 Second spring (elastic body)
42 Magnetic flux density sensor (magnetic flux density detection means)
125 High pressure sensor (pressure detector)
127 engine speed sensor (engine speed detection means)

Claims (16)

A compressor (2) for sucking and compressing and discharging refrigerant;
A throttle (31) provided on the discharge side of the compressor (2);
The spool (36) that moves according to the pressure loss in the throttle portion (31), the elastic body (38, 39) that urges the spool (36) to the non-fixed initial position, and the position of the spool (36) are detected. A flow rate detecting means (32) for detecting the flow rate of the refrigerant discharged from the compressor (2) based on the position of the spool (36).
When the compressor (2) is not operated, the position of the spool (36) detected by the position detecting means (42) is set in the vicinity of the non-fixed initial position with respect to the non-fixed initial position. A refrigeration cycle apparatus comprising: a sticking determination unit that determines that the spool (36) is stuck when the spool (36) is stuck farther than the first reference position.   The sticking determining means is further configured so that the position of the spool (36) detected by the position detecting means (42) during the operation of the compressor (2) is higher than the non-sticking initial position. 2. The refrigeration cycle apparatus according to claim 1, wherein the spool (36) is determined to be firmly attached when the spool (36) is located closer to the second reference position set in the vicinity of the position. A compressor (2) for sucking and compressing and discharging refrigerant;
A throttle (31) provided on the discharge side of the compressor (2);
The spool (36) that moves according to the pressure loss in the throttle portion (31), the elastic body (38, 39) that urges the spool (36) to the non-fixed initial position, and the position of the spool (36) are detected. A flow rate detecting means (32) for detecting a refrigerant flow rate on the discharge side of the compressor (2) based on the position of the spool (36),
A discharge capacity variable mechanism that varies the discharge capacity of the compressor (2);
A discharge capacity control means for outputting a control current to the discharge capacity variable mechanism to control the discharge capacity variable mechanism;
Fixing determination means for determining whether or not the spool (36) is fixed based on the position of the spool (36) detected by the position amount detection means;
The discharge capacity variable mechanism is configured such that the discharge capacity of the compressor (2) becomes a maximum discharge capacity when the control current output from the discharge capacity control means exceeds a first predetermined current. ,
The fixing determination means is configured such that, after the control current exceeds the first predetermined current, the position of the spool (36) detected by the position amount detection means is not fixed to the non-fixing initial position. The refrigeration cycle apparatus characterized by determining that the spool (36) is fixed when it is located closer to the second reference position set in the vicinity of the initial position. The discharge capacity variable mechanism is configured so that the discharge capacity of the compressor (2) becomes a minimum discharge capacity when the control current output from the discharge capacity control means is lower than a second predetermined current.
The sticking determination means is configured such that the position of the spool (36) detected by the position detecting means (42) after the control current falls below a second predetermined current is set to the non-sticking initial position. 4. The refrigeration cycle apparatus according to claim 3, wherein the spool (36) is determined to be fixed when it is positioned closer to the first reference position set in the vicinity of the initial fixing position. . Pressure detecting means (125) for detecting refrigerant pressure on the discharge side of the compressor (2);
Engine speed detecting means (127) for detecting the engine speed of the engine (11) for driving the compressor (2);
First driving torque estimating means for estimating the first driving torque of the compressor (2) based on the refrigerant pressure detected by the pressure detecting means (125) and the refrigerant flow rate detected by the flow rate detecting means (32). And
The output of the engine (11) is controlled based on the first driving torque estimated by the first driving torque estimating means, and the engine (11) has a rotational speed even if the first driving torque varies. It is designed to maintain a preset reference engine speed,
The discharge capacity control means has an engine speed abnormality state in which the engine speed detected by the engine speed detection means (127) fluctuates above a reference fluctuation amount set in advance with respect to the reference engine speed. 5. The refrigeration cycle apparatus according to claim 3, wherein the control current to be output to the discharge capacity variable mechanism is increased in a case where the discharge capacity is changed.   6. The discharge capacity control means increases the control current output to the discharge capacity variable mechanism until the first predetermined current is exceeded when the engine speed is abnormal. The refrigeration cycle apparatus described in 1. Pressure detecting means (125) for detecting refrigerant pressure on the discharge side of the compressor (2);
Engine speed detecting means (127) for detecting the engine speed of the engine (11) for driving the compressor (2);
First driving torque estimating means for estimating the first driving torque of the compressor (2) based on the refrigerant pressure detected by the pressure detecting means (125) and the refrigerant flow rate detected by the flow rate detecting means (32). And
The output of the engine (11) is controlled based on the first driving torque estimated by the first driving torque estimating means, and the engine (11) has a rotational speed even if the first driving torque varies. It is designed to maintain a preset reference engine speed,
The discharge capacity control means has an engine speed abnormality state in which the engine speed detected by the engine speed detection means (127) fluctuates above a reference fluctuation amount set in advance with respect to the reference engine speed. The refrigeration cycle apparatus according to claim 4, wherein the control current output to the discharge capacity variable mechanism is reduced in the case of becoming.   The discharge capacity control means reduces the control current output to the discharge capacity variable mechanism until it falls below the second predetermined current when the engine rotational speed abnormality state occurs. The refrigeration cycle apparatus described in 1.   The sticking determination means determines whether or not the spool (36) is stuck only when the engine speed is abnormal. The refrigeration cycle apparatus described. Pressure detecting means (125) for detecting refrigerant pressure on the discharge side of the compressor (2);
First drive torque estimation for estimating the first drive torque of the compressor (2) based on the refrigerant pressure detected by the pressure detection means (125) and the refrigerant flow rate detected by the flow rate detection means (32). Means,
Second driving torque estimating means for estimating a second driving torque of the compressor (2) based on the refrigerant pressure detected by the pressure detecting means (125) and the control current output to the variable discharge capacity mechanism; With
The discharge capacity control means is configured such that a difference between the first drive torque estimated by the first drive torque estimation means and the second drive torque estimated by the second drive torque estimation means is a preset reference. 5. The refrigeration cycle apparatus according to claim 3, wherein the control current output to the discharge capacity variable mechanism is increased when a drive torque estimation abnormality state exceeding a value is reached.   11. The discharge capacity control unit increases the control current output to the variable discharge capacity mechanism until the first predetermined current is exceeded when the drive torque estimation abnormality state occurs. The refrigeration cycle apparatus described in 1. Pressure detecting means (125) for detecting refrigerant pressure on the discharge side of the compressor (2);
First drive torque estimation for estimating the first drive torque of the compressor (2) based on the refrigerant pressure detected by the pressure detection means (125) and the refrigerant flow rate detected by the flow rate detection means (32). Means,
Second driving torque estimating means for estimating a second driving torque of the compressor (2) based on the refrigerant pressure detected by the pressure detecting means (125) and the control current output to the variable discharge capacity mechanism; With
The discharge capacity control means is configured such that a difference between the first drive torque estimated by the first drive torque estimation means and the second drive torque estimated by the second drive torque estimation means is a preset reference. 5. The refrigeration cycle apparatus according to claim 4, wherein the control current output to the discharge capacity variable mechanism is reduced when a drive torque estimation abnormality state exceeding a value is reached.   The discharge capacity control means reduces the control current output to the discharge capacity variable mechanism until it falls below the second predetermined current when the drive torque estimation abnormal state occurs. The refrigeration cycle apparatus described in 1.   The sticking determination means determines whether or not the spool (36) is locked only when the drive torque estimation abnormality state occurs. The refrigeration cycle apparatus described.   The operation of the compressor (2) is stopped when it is determined that the spool (36) is fixed by the fixing determination means. Refrigeration cycle equipment.   The position detecting means is disposed so as to face the magnetic body (37) provided on the spool (36), and detects a magnetic flux density changed by movement of the magnetic body (37). The refrigeration cycle apparatus according to any one of claims 1 to 15, wherein

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