JP2019027775A - Monitoring system - Google Patents

Abstract

To provide a monitoring system capable of early and accurately determining abnormality of a refrigeration cycle device mounted on a movable body.SOLUTION: A controller 15 included in a monitoring system 1 is configured to determine shortage of refrigerant flowing in a refrigeration cycle device 2, in a case where a cycle high pressure Pd is lower than a previous detection value, a cycle low pressure Ps is lower than a previous detection value, an ambient temperature Tamb is not less than a previous detection value, a cabin temperature Tcab is not less than a previous detection value, an air quantity mode Mcond of a condenser 4 is not more than a previous air quantity mode, and an air quantity mode Meva of an evaporator 6 is not less than a previous air quantity mode.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a monitoring system for monitoring a refrigeration cycle apparatus mounted on a moving body.

  Conventionally, a monitoring system for monitoring the amount of refrigerant circulating in the refrigeration cycle apparatus is known.

  The technique described in Patent Document 1 detects whether or not the amount of refrigerant circulating through the refrigeration cycle apparatus is appropriate by detecting the height of the liquid level of the refrigerant stored in the receiver provided in the circuit of the refrigeration cycle apparatus. Judgment.

Japanese Patent No. 5983678

  By the way, the technique described in Patent Document 1 described above is applied to a stationary refrigeration cycle apparatus such as a home air conditioner or a building air conditioner. Since this type of refrigeration cycle apparatus is used in an environment in which pipes are joined by welding or the like and there is almost no vibration or the like, it is assumed that there is almost no refrigerant leakage in design.

  On the other hand, the refrigeration cycle apparatus mounted on the mobile body is used in an environment where there are many disturbances such as changes in the outside air temperature and wind speed, and the mobile body and the compressor are accompanied by different vibrations. Therefore, in this refrigeration cycle apparatus, a rubber hose is used for a part of piping of the refrigeration cycle apparatus in order to absorb these loads. Therefore, in the refrigeration cycle apparatus, a so-called slow leak occurs in which the refrigerant leaks minutely through the rubber hose. Therefore, in this refrigeration cycle apparatus, the amount of refrigerant leakage that does not cause a problem within the service life or maintenance period of the product is calculated by design and filled in the circuit.

  Therefore, in the refrigeration cycle apparatus mounted on the moving body, the technique of Patent Document 1 on the premise of a stationary formula in which the level of the liquid phase refrigerant stored in the receiver is detected to determine whether the refrigerant amount is appropriate. Cannot be applied as is. In a refrigeration cycle apparatus mounted on a moving body, when a larger amount of refrigerant leaks than the designed leakage amount filled in the circuit, it is important to detect the refrigerant leakage as early as possible. If the detection of refrigerant leakage is delayed, the air conditioning function is deteriorated, and there is a risk that a compressor or the like constituting the refrigeration cycle apparatus may fail.

  An object of this invention is to provide the monitoring system which can determine the abnormality of the refrigerating-cycle apparatus mounted in a moving body early and correctly in view of the said point.

In order to achieve the above object, the invention according to claim 1
A monitoring system that monitors a refrigeration cycle device (2) mounted on a moving body by connecting a compressor (3), a condenser (4), an expansion valve (5), and an evaporator (6) through a pipe (7). There,
A high pressure side pressure detector (11) for detecting the pressure (Pd) of the refrigerant flowing in the high pressure side circuit from the discharge port (31) of the compressor to the expansion valve in the refrigeration cycle apparatus;
A low pressure side pressure detector (12) for detecting the pressure (Ps) of the refrigerant flowing in the low pressure side circuit from the expansion valve to the suction port (32) of the compressor in the refrigeration cycle apparatus;
An outside air temperature detector (13) for detecting the air temperature outside the passenger compartment (Tamb);
An internal air temperature detector (14) for detecting the air temperature (Tcab) in the passenger compartment;
A controller (15) capable of setting a condenser air volume mode (Mcond) and an evaporator air volume mode (Meva),
The control device
The detection value (Pd2) of the high pressure side pressure detection unit is lower than the previous detection value (Pd1),
The detection value (Ps2) of the low pressure side pressure detection unit is lower than the previous detection value (Ps1),
The detection value (Tamb2) of the outside air temperature detection unit is equal to or greater than the previous detection value (Tamb1),
The detection value (Tcab2) of the inside air temperature detection unit is equal to or greater than the previous detection value (Tcab1),
The air volume mode (Mcond2) of the condenser is equal to or lower than the previous air volume mode (Mcond1),
When the airflow mode (Meva2) of the evaporator is equal to or higher than the previous airflow mode (Meva1), it is determined that the refrigerant flowing through the refrigeration cycle apparatus is insufficient.

  According to this, when the amount of refrigerant flowing through the refrigeration cycle apparatus is insufficient, both the pressure of the refrigerant flowing through the high-pressure side circuit of the refrigeration cycle apparatus and the pressure of the refrigerant flowing through the low-pressure side circuit are reduced. However, when the air temperature outside the passenger compartment is low and the air volume mode of the condenser is large, condensation of the refrigerant is promoted by the condenser, and the pressure of the refrigerant in the high-pressure side circuit may decrease. Further, when the air temperature in the passenger compartment is low and the air volume mode of the evaporator is small, the evaporation of the refrigerant is suppressed by the evaporator, and the pressure of the refrigerant in the low-pressure side circuit may decrease. In that case, the control device avoids the determination of insufficient refrigerant. Therefore, in the control device, the refrigerant pressures in the high-pressure side circuit and the low-pressure side circuit are both lower than the previous measured value, and the refrigerant pressure drop is caused by the air temperature outside the cabin and in the cabin, the condenser and the evaporator. When it is not due to the air volume, the lack of refrigerant is determined. Therefore, the control device can quickly and accurately determine whether or not the refrigerant is insufficient at a stage where the refrigerant leaks more than the design leakage amount filled in the circuit.

The invention according to claim 3
A monitoring system that monitors a refrigeration cycle device (2) mounted on a moving body by connecting a compressor (3), a condenser (4), an expansion valve (5), and an evaporator (6) through a pipe (7). There,
A high pressure side pressure detector (11) for detecting the pressure (Pd) of the refrigerant flowing in the high pressure side circuit from the discharge port (31) of the compressor to the expansion valve in the refrigeration cycle apparatus;
A low pressure side pressure detector (12) for detecting the pressure (Ps) of the refrigerant flowing in the low pressure side circuit from the expansion valve to the suction port (32) of the compressor in the refrigeration cycle apparatus;
An outside air temperature detector (13) for detecting the air temperature outside the passenger compartment (Tamb);
An internal air temperature detector (14) for detecting the air temperature (Tcab) in the passenger compartment;
A controller (15) capable of setting a condenser air volume mode (Mcond) and an evaporator air volume mode (Meva),
The control device stores, as a first set value (Th1), a decrease in the refrigerant pressure of the high-pressure circuit according to the refrigerant leakage amount predicted for a predetermined period, and a low pressure according to the refrigerant leakage amount predicted for the predetermined period. A decrease in the refrigerant pressure of the side circuit is stored as a second set value (Th2);
A value obtained by subtracting the detection value (Pd2) detected this time from the detection value (Pd3) detected by the high-pressure side pressure detection unit before a predetermined period is larger than the first set value,
A value obtained by subtracting the detection value (Ps2) detected this time from the detection value (Ps3) detected by the low-pressure side pressure detection unit before a predetermined period is larger than the second set value,
The detection value (Tamb2) detected this time by the outside air temperature detection unit is not less than the detection value (Tamb3) detected before a predetermined period,
The detection value (Tcab2) detected this time by the inside air temperature detection unit is equal to or greater than the detection value (Tcab3) detected before a predetermined period,
The air volume mode (Mcond2) of the condenser is equal to or lower than the air volume mode (Mcond3) detected before the predetermined period,
When the airflow mode (Meva2) of the evaporator is equal to or higher than the airflow mode (Meva3) detected before a predetermined period, it is determined that a circuit abnormality has occurred in the refrigeration cycle apparatus.

  According to this, in the refrigeration cycle apparatus mounted on the moving body, the amount of refrigerant leaking in a predetermined period is predicted by design. For this reason, the range of decrease in the refrigerant pressure in the high-pressure side circuit and the range of decrease in the refrigerant pressure in the low-pressure side circuit according to the refrigerant leakage amount predicted for the predetermined period are set as the first set value and the second set value, respectively. It is possible to memorize. Therefore, the control device determines a circuit abnormality when the decrease in the refrigerant pressure in the high-pressure circuit in the predetermined period is greater than the first set value and the decrease in the refrigerant pressure in the low-pressure circuit is greater than the second set value. Is possible. The circuit abnormality is, for example, an abnormality in which the refrigerant is likely to leak due to deterioration of the rubber hose / packing, an abnormality in the air flow through the evaporator (for example, abnormal stop of the blower, clogging of the air filter), or the flow rate of the refrigerant (For example, abnormalities of expansion valves, clogged liquid piping).

  In addition, the code | symbol in the parenthesis attached | subjected to each said structure shows an example of the correspondence with the specific structure described in embodiment mentioned later.

1 is a configuration diagram of a monitoring system according to a first embodiment. It is a control block diagram of the monitoring system concerning a 1st embodiment. It is a flowchart of the control processing of the monitoring system which concerns on 1st Embodiment. It is the figure which showed the state of the refrigerant | coolant of a refrigerating-cycle apparatus on the Mollier diagram. It is a flowchart of the control processing of the monitoring system which concerns on 2nd Embodiment.

  Embodiments of the present invention will be described below with reference to the drawings. In the following embodiments, parts that are the same or equivalent to each other are given the same reference numerals, and descriptions thereof are omitted.

(First embodiment)
A first embodiment will be described with reference to the drawings. The monitoring system 1 of 1st Embodiment is a system which monitors the refrigerant | coolant amount which circulates through the refrigerating-cycle apparatus 2 mounted in the vehicle as a moving body. First, the refrigeration cycle apparatus 2 to be monitored by the monitoring system 1 of the first embodiment will be described. The refrigeration cycle apparatus 2 is applied to an air conditioner for performing air conditioning in a vehicle interior of a vehicle.

  As shown in FIG. 1, the refrigeration cycle apparatus 2 is mounted on a vehicle in a state where a compressor 3, a condenser 4, an expansion valve 5, an evaporator 6 and the like are connected by a pipe 7 and filled with a refrigerant. is there. As the refrigerant charged in the refrigeration cycle apparatus 2, for example, R134a which is an HFC refrigerant is employed. In addition, the oil (namely, refrigerator oil) which lubricates the compressor 3 is mixed in the refrigerant | coolant. Part of the oil circulates in the circuit together with the refrigerant.

  The compressor 3 compresses the refrigerant sucked from the pipe 74 on the evaporator 6 side and discharges it to the pipe 71 on the condenser 4 side. The compressor 3 includes a compression mechanism such as a reciprocating type or a rotary type. The compressor 3 is driven by an engine or an electric motor (not shown) mounted on the vehicle.

  The condenser 4 condenses the high-temperature and high-pressure refrigerant discharged from the compressor 3 by air outside the vehicle (hereinafter referred to as “outside air”) blown from the outdoor blower 8 to the condenser 4 or by the wind pressure when the vehicle travels. It is a heat exchanger that exchanges heat with the outside air blown to the vessel 4. As indicated by the dashed arrow AFo in FIG. 1, the outside air blown from the outdoor blower 8 passes through the condenser 4. The refrigerant flowing through the condenser 4 dissipates heat to the outside air blown to the condenser 4 and condenses.

  A receiver 9 is provided on the downstream side of the condenser 4. The receiver 9 stores the refrigerant that has flowed out of the condenser 4 and sends out only the liquid-phase refrigerant to the expansion valve 5. In the refrigeration cycle apparatus 2, the refrigerant leakage amount that slowly leaks during the product life or maintenance period is calculated by design and filled in the circuit. Therefore, the receiver 9 stores the refrigerant corresponding to the leakage amount calculated in the design.

  The expansion valve 5 is an expansion valve 5 that decompresses and expands the refrigerant that has passed through the condenser 4. As the expansion valve 5, for example, a temperature type expansion valve whose valve opening is automatically adjusted according to the temperature on the outlet side of the evaporator 6 is employed.

  The evaporator 6 exchanges heat between vehicle interior air (hereinafter referred to as “inside air”) or outside air blown by the indoor blower 10 that blows air into the vehicle interior space, and low-temperature and low-pressure refrigerant decompressed by the expansion valve 5. It is a heat exchanger. As indicated by the broken line arrow AFc in FIG. 1, the air blown from the indoor blower 10 passes through the evaporator 6. The refrigerant flowing through the evaporator 6 absorbs heat from the air blown by the indoor blower 10 and evaporates. The air blown by the indoor blower 10 is cooled by the latent heat of vaporization of the refrigerant when passing through the evaporator 6 and then blown out into the passenger compartment.

  The compressor 3, the condenser 4, the expansion valve 5, and the evaporator 6 are connected by a plurality of pipes 7 to form a closed circuit. Specifically, the pipe 7 includes a first high-pressure pipe 71, a second high-pressure pipe 72, a first low-pressure pipe 73, and a second low-pressure pipe 74. The first high-pressure pipe 71 connects the refrigerant discharge port 31 of the compressor 3 and the refrigerant inlet side of the condenser 4. The second high-pressure pipe 72 connects the refrigerant outlet side of the receiver 9 and the refrigerant inlet side of the expansion valve 5. The first low-pressure pipe 73 connects the refrigerant outlet side of the expansion valve 5 and the refrigerant inlet side of the evaporator 6. The second low-pressure pipe 74 connects the refrigerant outlet side of the evaporator 6 and the suction port 32 of the compressor 3.

  Each pipe 7 is basically composed of a metal pipe 7. However, a part of the first high-pressure pipe 71 and a part of the second low-pressure pipe 74 are made of a polymer material such as rubber or resin having excellent flexibility in order to absorb vibrations of the engine and the compressor 3. ing. Since the pipe 7 made of a polymer material has higher gas permeability than the metal pipe 7, the refrigerant flowing through the pipe gradually permeates to the outside. Therefore, in the refrigeration cycle apparatus 2 mounted on a moving body such as a vehicle, a slow leak of refrigerant from the piping 7 formed of a polymer material, the seal member of the compressor 3, and the like is unavoidable. Therefore, the monitoring system 1 of the first embodiment monitors the amount of refrigerant circulating in the refrigerant circuit of the refrigeration cycle apparatus 2, and when the refrigerant leaks more than the design leakage amount charged in the circuit, the refrigerant is insufficient. Judgment can be made early and accurately.

  Next, the monitoring system 1 according to the first embodiment will be described. As shown in FIGS. 1 and 2, the monitoring system 1 of the first embodiment includes a high pressure side pressure detection unit 11, a low pressure side pressure detection unit 12, an outside air temperature detection unit 13, an inside air temperature detection unit 14, a control device 15, and A notification unit 16 and the like are provided.

  The high pressure side pressure detection unit 11 is a pressure sensor that detects the pressure of the refrigerant flowing in the high pressure side circuit from the discharge port 31 of the compressor 3 to the expansion valve 5 in the refrigeration cycle apparatus 2 (hereinafter referred to as “cycle high pressure Pd”). is there. The high pressure side pressure detection unit 11 is installed in the first high pressure pipe 71, the condenser 4 or the second high pressure pipe 72, and the like.

  The low-pressure side pressure detection unit 12 is a pressure sensor that detects the pressure of refrigerant flowing through the low-pressure side circuit from the expansion valve 5 to the suction port 32 of the compressor 3 (hereinafter referred to as “cycle low pressure Ps”) in the refrigeration cycle apparatus 2. is there. The low pressure side pressure detector 12 is installed in the first low pressure pipe 73, the evaporator 6 or the second low pressure pipe 74, and the like.

  The outside air temperature detection unit 13 is a temperature sensor that detects an air temperature outside the passenger compartment (hereinafter referred to as “outside air temperature Tamb”). The inside air temperature detection unit 14 is a temperature sensor that detects an air temperature in the passenger compartment (hereinafter referred to as “inside air temperature Tcab”).

  Information detected by the high pressure side pressure detection unit 11, the low pressure side pressure detection unit 12, the outside air temperature detection unit 13, and the inside air temperature detection unit 14 described above is transmitted to the control device 15. The control device 15 includes a known microcomputer having a processor and a storage unit such as a ROM and a RAM. The storage unit is configured by a non-transitional tangible storage medium.

  In 1st Embodiment, the control apparatus 15 with which the monitoring system 1 is provided is demonstrated as what is comprised integrally with the air-conditioning control apparatus which controls operation | movement of each part of the refrigerating-cycle apparatus 2 and an air conditioner. In addition, the control apparatus 15 and the air-conditioning control apparatus which comprise the monitoring system 1 may be comprised separately.

  The control device 15 functions as a condenser air volume setting unit 17, and based on the vehicle interior set temperature and the vehicle interior temperature, the air volume mode (hereinafter referred to as “the condenser 4 of the condenser 4”). “Air volume mode Mcond”). Further, the control device 15 functions as an evaporator air volume setting unit 18 and sets an air volume mode of the air blown to the evaporator 6 by the indoor fan 10 (hereinafter referred to as “air volume mode Meva of the evaporator 6”). Note that the condenser air volume setting unit 17 and the evaporator air volume setting unit 18 set the air volume mode Mcond of the condenser 4 and the air volume mode Meva of the evaporator 6 larger as the difference between the vehicle interior set temperature and the vehicle interior temperature increases. To do. Further, the condenser air volume setting unit 17 and the evaporator air volume setting unit 18 set the air volume mode Mcond of the condenser 4 and the air volume mode Meva of the evaporator 6 to be smaller as the difference between the vehicle interior set temperature and the vehicle interior temperature is smaller. To do. Then, the control device 15 detects the air volume mode Mcond of the condenser 4 set by the condenser air volume setting unit 17. The control device 15 can also detect the air volume of the condenser 4 from vehicle speed information or the like. Further, the control device 15 detects the air volume mode Meva of the evaporator 6 set by the evaporator air volume setting unit 18.

  The control device 15 includes information detected by the high pressure side pressure detection unit 11, the low pressure side pressure detection unit 12, the outside air temperature detection unit 13, the inside air temperature detection unit 14, the condenser air volume setting unit 17, and the evaporator air volume setting unit 18. Thus, the refrigerant flowing through the refrigeration cycle apparatus 2 is monitored. Hereinafter, control processing executed by the control device 15 of the first embodiment will be described with reference to the flowchart of FIG.

  This control process is started when the ignition key of the vehicle is turned on and the switch of the air conditioner is turned on. In step S10, the control device 15 determines whether or not the current control process is the first process after the ignition key is turned on. When it is determined that the current control process is the first process after the ignition key is turned on, the control device 15 shifts the next process to step S20. On the other hand, if it is determined in step S10 that the current control process is the second or subsequent process after the ignition key is turned on, step S20 is omitted, and the next process proceeds to step S30. .

  In step S20, the control device 15 stores the cycle high pressure Pd1, the cycle low pressure Ps1, the outside air temperature Tamb1, the inside air temperature Tcab1, the air volume mode Mcond1 of the condenser 4, and the air volume mode Meva1 of the evaporator 6 detected in the previous control process. Read from the section. And the control apparatus 15 transfers a process to step S30. In the description of the first embodiment, the “previous control process” refers to a control process executed when the ignition key of the vehicle was previously turned on.

  In step S <b> 30, the control device 15 measures the current cycle high pressure Pd <b> 2 by the high pressure side pressure detector 11, and measures the current cycle low pressure Ps <b> 2 by the low pressure side pressure detector 12. In addition, the control device 15 measures the current outside air temperature Tamb2 using the outside air temperature detecting unit 13, and measures the current inside air temperature Tcab2 using the inside air temperature detecting unit 14. Further, the control device 15 detects the current air volume mode Mcond2 of the condenser 4 from the condenser air volume setting unit 17, and detects the current air volume mode Meva2 of the evaporator 6 from the evaporator air volume setting unit 18. And the control apparatus 15 transfers a process to step S40.

  In step S40, the control device 15 determines whether or not the current cycle high pressure Pd2 is lower than the cycle high pressure Pd1 detected in the previous control process, and the current cycle low pressure Ps2 is lower than the cycle low pressure Ps1 detected in the previous control process. It is determined whether or not.

  Here, the characteristics of the refrigeration cycle apparatus 2 will be described with reference to FIG. The solid line α in FIG. 4 represents the transition of the state of the refrigerant when the refrigerant amount is sufficiently in the circuit of the refrigeration cycle apparatus 2 on the Mollier diagram. A1 in FIG. 4 indicates the state of the refrigerant discharged from the compressor 3, A2 indicates the state of the refrigerant flowing out of the condenser 4, A3 indicates the state of the refrigerant depressurized by the expansion valve 5, and A4 indicates evaporation. The state of the refrigerant flowing out of the vessel 6 is shown.

  On the other hand, the broken line β in FIG. 4 represents the transition of the state of the refrigerant when the refrigerant amount in the circuit of the refrigeration cycle apparatus 2 is insufficient on the Mollier diagram. If the amount of refrigerant is insufficient, as shown by B1 in FIG. 4, the pressure of the high-pressure refrigerant discharged from the compressor 3 decreases, and the cycle high pressure Pd decreases. Moreover, as shown in B2 of FIG. 4, the degree of supercooling of the refrigerant on the refrigerant outlet side of the condenser 4 becomes small. The decrease amount ΔPH of the cycle high pressure Pd increases as the refrigerant amount in the circuit becomes insufficient. Further, the amount of decrease ΔSC in the degree of refrigerant supercooling increases as the amount of refrigerant in the circuit becomes insufficient.

  Further, when the refrigerant amount is insufficient, the pressure of the low-pressure refrigerant flowing out from the expansion valve 5 is lowered and the cycle low pressure Ps is lowered, as indicated by B3 in FIG. Further, as shown by B4 in FIG. 4, the pressure of the low-pressure refrigerant sucked into the compressor 3 decreases, and the degree of superheating of the refrigerant on the refrigerant outlet side of the evaporator 6 increases. The decrease amount ΔPL of the cycle low pressure Ps and the increase amount ΔSH of the superheat degree of the refrigerant increase as the refrigerant amount in the circuit becomes insufficient.

  As described above, the refrigeration cycle apparatus 2 has a characteristic that both the cycle high pressure Pd and the cycle low pressure Ps are lowered when the refrigerant amount in the circuit is smaller than the design leakage amount and the refrigerant becomes insufficient. Therefore, in step S40 of FIG. 3, the control device 15 determines that the current cycle high pressure Pd2 is lower than the cycle high pressure Pd1 detected in the previous control process, and the current cycle low pressure Ps2 is detected in the previous control process. If lower, the process proceeds to step S50. This is because if the current cycle high pressure Pd2 and the cycle low pressure Ps2 are both lower than the previous measured values Pd1 and Ps1, the refrigerant amount may be insufficient.

  On the other hand, in step S40, the control device 15 determines that the current cycle high pressure Pd2 is equal to or higher than the cycle high pressure Pd1 detected in the previous control process, or the current cycle low pressure Ps2 is equal to or higher than the cycle low pressure Ps1 detected in the previous control process. If so, the process proceeds to step S120. If either the current cycle high pressure Pd2 or the current cycle low pressure Ps2 is the same as the previous measurement values Pd1, Ps1 or higher than the previous measurement values Pd1, Ps1, it cannot be said that the refrigerant amount is insufficient. is there.

  For example, when the current rotational speed of the compressor 3 is higher than the rotational speed of the compressor 3 at the previous measurement, the current cycle high pressure Pd2 is higher than the previous cycle high pressure Pd1, and the current cycle low pressure Ps2 is the previous cycle. It becomes lower than the low pressure Ps1. In this case, since it cannot be said that the refrigerant amount is insufficient, the process proceeds to step S120.

  If it is determined in step S40 that the current cycle high pressure Pd2 is lower than the cycle high pressure Pd1 detected in the previous control process, and the current cycle low pressure Ps2 is lower than the cycle low pressure Ps1 detected in the previous control process, Processing from step S50 to step S80 to be described is performed.

  In step S50, the control device 15 determines whether or not the current outside air temperature Tamb2 is equal to or higher than the outside air temperature Tamb1 detected in the previous control process. When the current outside air temperature Tamb2 is lower than the outside air temperature Tamb1 detected in the previous control process, the condensation of the refrigerant is promoted in the condenser 4 and the cycle high pressure Pd may be lowered. Further, when the current outside air temperature Tamb2 is lower than the outside air temperature Tamb1 detected in the previous control process, the evaporation of the refrigerant is suppressed by the evaporator 6 and the cycle low pressure Ps may be lowered. Therefore, when the current outside air temperature Tamb2 is lower than the outside air temperature Tamb1 detected in the previous control process, the control device 15 avoids the determination of the refrigerant shortage, and moves the process to step S120. On the other hand, when it is determined that the current outside air temperature Tamb2 is equal to or higher than the outside air temperature Tamb1 detected in the previous control process, the control device 15 proceeds to step S60.

  In step S60, the control device 15 determines whether or not the current internal air temperature Tcab2 is equal to or higher than the internal air temperature Tcab1 detected in the previous control process. When the current inside air temperature Tcab2 is lower than the inside air temperature Tcab1 detected in the previous control process, the evaporation of the refrigerant is suppressed by the evaporator 6 and the cycle low pressure Ps may be lowered. Therefore, when the current internal temperature Tcab2 is lower than the internal temperature Tcab1 detected in the previous control process, the control device 15 avoids the determination of the lack of refrigerant and shifts the process to step S120. On the other hand, when determining that the current internal temperature Tcab2 is equal to or higher than the internal temperature Tcab1 detected in the previous control process, the control device 15 proceeds to step S70.

  In step S70, the control device 15 determines whether or not the current air volume mode Mcond2 of the condenser 4 is equal to or lower than the air volume mode Mcond1 of the condenser 4 detected in the previous control process. When the current air volume mode Mcond2 of the condenser 4 is larger than the airflow mode Mcond1 of the condenser 4 detected in the previous control process, the condensation of the refrigerant is promoted in the condenser 4, and the cycle high pressure Pd may decrease. Therefore, when the current air volume mode Mcond2 of the condenser 4 is larger than the airflow mode Mcond1 of the condenser 4 detected in the previous control process, the control device 15 avoids the determination of the refrigerant shortage and shifts the process to step S120. On the other hand, if the control device 15 determines that the current air volume mode Mcond2 of the condenser 4 is equal to or less than the airflow mode Mcond1 of the condenser 4 detected in the previous control process, the process proceeds to step S80.

  In step S80, the control device 15 determines whether or not the current air volume mode Meva2 of the evaporator 6 is equal to or higher than the air volume mode Meva1 of the evaporator 6 detected in the previous control process. When the current air volume mode Meva2 of the evaporator 6 is smaller than the air volume mode Meva1 of the evaporator 6 detected in the previous control process, the evaporation of the refrigerant is suppressed in the evaporator 6 and the cycle low pressure Ps may be lowered. Therefore, when the current air volume mode Meva2 of the evaporator 6 is smaller than the air volume mode Meva1 of the evaporator 6 detected in the previous control process, the control device 15 avoids the determination of the refrigerant shortage and shifts the process to step S120. On the other hand, if the controller 15 determines that the current air volume mode Meva2 of the evaporator 6 is equal to or higher than the air volume mode Meva1 of the evaporator 6 detected in the previous control process, the process proceeds to step S90.

  In step S90, the control device 15 determines that the refrigerant amount in the circuit is smaller than the design leakage amount based on the determinations in steps S40 to S80 described above, that is, the refrigerant is insufficient. And the control apparatus 15 transfers a process to step S100.

  In step S <b> 100, the notification unit 16 notifies the passenger or the like that the refrigeration cycle apparatus 2 is in a refrigerant shortage state in accordance with a command from the control device 15. Specifically, the notification unit 16 can be configured by a display panel or a buzzer (not shown). The display panel visually displays to the occupant and the like that the refrigeration cycle apparatus 2 is in a state of insufficient refrigerant. Further, the buzzer notifies by sound that the refrigeration cycle apparatus 2 is in a state of insufficient refrigerant. Thereby, the alerting | reporting part 16 encourages a passenger | crew etc. to perform maintenance etc. by alerting | reporting operation | movement, such as a display panel or a buzzer. Next, the control apparatus 15 transfers a process to step S110.

  In step S <b> 110, the control device 15 performs control to reduce the load on the compressor 3. Specifically, when the compressor 3 is configured to rotate with the rotation of the engine, the control device 15 performs control to reduce the amount of refrigerant compressed by the compressor 3 by a clutch operation or the like. When the compressor 3 is driven by an electric motor, the control device 15 performs control such as lowering the rotation speed of the electric motor. After step S110, the control device 15 once ends this control process.

  On the other hand, when the process proceeds to step S120 in step S40 to step S80 described above, the control device 15 causes the current cycle high pressure Pd2, the cycle low pressure Ps2, the outside air temperature Tamb2, the inside air temperature Tcab2, and the condenser 4 detected in step S30. The air flow mode Mcond2 and the airflow mode Meva2 of the evaporator 6 are respectively the cycle high pressure Pd1, the cycle low pressure Ps1, the outside air temperature Tamb1, the internal air temperature Tcab1, and the air flow mode Mcond1 of the condenser 4 and the evaporator 6 detected in the previous control process. The air volume mode Meva1 is stored in the storage unit. And the control apparatus 15 once complete | finishes this control processing, and performs repeatedly every predetermined time progress.

  The monitoring system 1 according to the first embodiment described above has the following operational effects.

  (1) In the first embodiment, the controller 15 determines that the cycle high pressure Pd2 and the cycle low pressure Ps2 are both lower than the previous detection values Pd1 and Ps1, and the outside air temperature Tamb2 and the internal air temperature Tcab2 are both equal to or higher than the previous detection values Tamb1 and Tcab1. When the air volume mode Mcond2 of the condenser 4 is equal to or lower than the previous air volume mode Mcond1, and the air volume mode Meva2 of the evaporator 6 is equal to or higher than the previous air volume mode Meva1, it is determined that the refrigerant is insufficient. According to this, when the refrigerant flowing through the refrigeration cycle apparatus 2 is insufficient, both the cycle high pressure Pd and the cycle low pressure Ps are lowered. However, when the outside air temperature Tamb is low or when the air volume mode Mcond of the condenser 4 is large, the cycle high pressure Pd may decrease. In addition, when the inside air temperature Tcab is low or when the air volume mode Meva of the evaporator 6 is small, the cycle low pressure Ps may decrease. Therefore, in such a case, the control device 15 can make an early and accurate determination of the refrigerant shortage at a stage where the refrigerant leaks more than the design leakage amount filled in the circuit while avoiding the refrigerant shortage determination. Is possible.

  (2) In 1st Embodiment, the alerting | reporting part 16 performs alerting | reporting operation | movement accompanying determination of the control apparatus 15. FIG. By notifying the occupant or the like with maintenance or the like by the notification unit 16, it is possible to prevent a failure of the equipment configuring the refrigeration cycle apparatus 2 and to prevent customer complaints associated with a decrease in the air conditioning function.

  (3) In 1st Embodiment, the control apparatus 15 performs control which reduces the load of the compressor 3, when it determines with the refrigerant | coolant shortage of the refrigeration cycle apparatus 2. FIG. In general, when the refrigerant in the refrigeration cycle apparatus 2 is insufficient, the load on the compressor 3 increases, which may lead to failure of the compressor 3. Therefore, the monitoring system 1 can prevent a failure of the compressor 3 by performing control to reduce the load of the compressor 3 when the refrigerant is insufficient.

(Second Embodiment)
A second embodiment will be described with reference to FIG. 2nd Embodiment changes the control processing which the monitoring system 1 performs with respect to 1st Embodiment. Note that the control processing described in the second embodiment may be executed continuously or simultaneously with the control processing described in the first embodiment, or may be executed individually.

  The control processing of the second embodiment will be described with reference to the flowchart of FIG. This control process is started when the ignition key of the vehicle is turned on and the switch of the air conditioner is turned on. In step S110, the control device 15 determines whether or not the current control process has passed a predetermined period from the previous measurement. The previous measurement can be set, for example, the previous measurement or several days to several tens of days, and the predetermined period can be set, for example, several days to several tens of days. If the control device 15 determines that the predetermined time has elapsed since the previous measurement, the control device 15 proceeds to step S120. On the other hand, if the control device 15 determines that the current control process has not passed the predetermined period from the previous measurement, the process is temporarily ended.

  In step S120, the control device 15 detects the cycle high pressure Pd3 detected before the predetermined period, the cycle low pressure Ps3 detected before the predetermined period, the outside air temperature Tamb3 detected before the predetermined period, the internal temperature Tcab3 detected before the predetermined period, and the predetermined period. The air volume mode Mcond3 of the condenser 4 detected before and the air volume mode Meva3 of the evaporator 6 detected before a predetermined period are read from the storage unit. And the control apparatus 15 transfers a process to step S130.

  In step S130, the control device 15 determines the current cycle high pressure Pd2, the current cycle high pressure Pd2, the current cycle low pressure Ps2, the current outside air temperature Tamb2, the current inside air temperature Tcab2, the current air volume mode Mcond2 of the condenser 4, and The current air volume mode Meva2 of the evaporator 6 is detected. And the control apparatus 15 transfers a process to step S140.

  In step S140, the control device 15 determines whether or not a value obtained by subtracting the cycle high pressure Pd2 detected this time from the cycle high pressure Pd3 detected before a predetermined period is larger than the first set value Th1. Further, the control device 15 determines whether or not a value obtained by subtracting the cycle low pressure Ps2 detected this time from the cycle low pressure Ps3 detected before the predetermined period is larger than the second set value Th2.

  Here, in the refrigeration cycle apparatus 2 mounted on a moving body such as a vehicle, the amount of refrigerant that leaks during a predetermined period (so-called slow leak) is predicted by design. Therefore, the control device 15 stores the decrease range of the cycle high pressure Pd and the decrease range of the cycle low pressure Ps according to the refrigerant leakage amount predicted for the predetermined period as the first set value Th1 and the second set value Th2, respectively. Is possible. When the value measured before the predetermined period is compared with the value measured this time, the decrease range of the cycle high pressure Pd is larger than the first set value Th1, and the decrease range of the cycle low pressure Ps is larger than the second set value Th2. In this case, there is a possibility that a larger amount of refrigerant leaks than the designed slow leak. Reasons for such a large amount of refrigerant leakage include situations in which refrigerant is likely to leak due to deterioration of the rubber hose / packing of the refrigeration cycle apparatus 2, abnormalities in the amount of air flowing through the evaporator (for example, abnormal blower stop, air filter clogging), It is conceivable that a circuit abnormality has occurred, such as an abnormal drop in the refrigerant flow rate (for example, an abnormality in the expansion valve or a clogged liquid pipe). Therefore, in step S140, the controller 15 determines that the value obtained by subtracting the cycle high pressure Pd2 detected this time from the cycle high pressure Pd3 detected before the predetermined period is larger than the first set value Th1, and the cycle low pressure Ps3 detected before the predetermined period. If the value obtained by subtracting the cycle low pressure Ps2 detected this time is larger than the second set value Th2, the process proceeds to step S150.

  On the other hand, in step S140, the controller 15 determines that the value obtained by subtracting the cycle high pressure Pd2 detected this time from the cycle high pressure Pd3 detected before the predetermined period is equal to or less than the first set value Th1, or the cycle detected before the predetermined period. When the value obtained by subtracting the cycle low pressure Ps2 detected this time from the low pressure Ps3 is equal to or less than the second set value Th2, the process proceeds to step S220. In that case, it cannot be said that a circuit abnormality has occurred.

  The processes in steps S150 to S180 are substantially the same as the processes described in steps S50 to S80 in the first embodiment.

  In step S150, the control device 15 determines whether or not the currently detected outside air temperature Tamb2 is equal to or higher than the outside air temperature Tamb3 detected before the predetermined period. When the outside air temperature Tamb2 detected this time is lower than the outside air temperature Tamb3 detected before the predetermined period, the control device 15 proceeds to step S220. On the other hand, when it is determined that the outside air temperature Tamb2 detected this time is equal to or higher than the outside air temperature Tamb3 detected before the predetermined period, the control device 15 proceeds to step S160.

  In step S160, the control device 15 determines whether or not the internal temperature Tcab2 detected this time is equal to or higher than the internal temperature Tcab3 detected before a predetermined period. When the inside air temperature Tcab2 detected this time is lower than the inside air temperature Tcab3 detected before the predetermined period, the control device 15 proceeds to step S220. On the other hand, if the control device 15 determines that the internal temperature Tcab2 detected this time is equal to or higher than the internal temperature Tcab3 detected before a predetermined period, the process proceeds to step S170.

  In step S170, the control device 15 determines whether or not the air volume mode Mcond2 of the condenser 4 detected this time is equal to or lower than the air volume mode Mcond3 of the condenser 4 detected before a predetermined period. When the air volume mode Mcond2 of the condenser 4 detected this time is larger than the air volume mode Mcond3 of the condenser 4 detected before a predetermined period, the control device 15 proceeds to step S220. On the other hand, when it is determined that the air volume mode Mcond2 of the condenser 4 detected this time is equal to or lower than the air volume mode Mcond3 of the condenser 4 detected before a predetermined period, the control device 15 proceeds to step S180.

  In step S180, the control device 15 determines whether or not the air volume mode Meva2 of the evaporator 6 detected this time is equal to or higher than the air volume mode Meva3 of the evaporator 6 detected before a predetermined period. When the air volume mode Meva2 of the evaporator 6 detected this time is smaller than the air volume mode Meva3 of the evaporator 6 detected before a predetermined period, the control device 15 shifts the processing to step S220. On the other hand, when it is determined that the air volume mode Meva2 of the evaporator 6 detected this time is equal to or higher than the air volume mode Meva3 of the evaporator 6 detected before a predetermined period, the control device 15 proceeds to step S190.

  In step S190, the control device 15 determines that a circuit abnormality has occurred in the refrigeration cycle apparatus 2 based on the determinations in steps S140 to S180 described above. And the control apparatus 15 transfers a process to step S200.

  In step S200, the notification unit 16 notifies the occupant or the like that a circuit abnormality has occurred in the refrigeration cycle apparatus 2 in accordance with a command from the control device 15. In addition, the display panel as the alerting | reporting part 16 displays visually that the circuit abnormality has generate | occur | produced in the refrigerating-cycle apparatus 2 with respect to a passenger | crew. In addition, the buzzer notifies by sound that a circuit abnormality has occurred in the refrigeration cycle apparatus 2. Thereby, the alerting | reporting part 16 encourages a passenger | crew etc. to perform maintenance etc. by alerting | reporting operation | movement, such as a display panel or a buzzer. Next, the control apparatus 15 transfers a process to step S210. In step S210, similarly to the process described in step S110 of the first embodiment, control for reducing the load on the compressor 3 is performed. After step S210, the control device 15 once ends this control process.

  On the other hand, when the process proceeds to step S220 in step S140 to step S180 described above, the control device 15 detects the cycle high pressure Pd2, the cycle low pressure Ps2, the outside air temperature Tamb2, the inside air temperature Tcab2, which are detected in step S130, and the condenser. 4 air volume mode Mcond2 and evaporator 6 air volume mode Meva2 are detected in the control process before the predetermined period, respectively, cycle high pressure Pd3, cycle low pressure Ps3, outside air temperature Tamb3, inside air temperature Tcab3, condenser 4 air volume mode Mcond3 and It replaces with the air volume mode Meva3 of the evaporator 6, and memorize | stores in a memory | storage part. And the control apparatus 15 once complete | finishes this control processing, and performs repeatedly every predetermined time progress.

  The monitoring system 1 according to the second embodiment described above has the following operational effects.

  (1) In the second embodiment, the control device 15 detects that the value obtained by subtracting the cycle high pressure Pd2 detected this time from the cycle high pressure Pd3 detected before a predetermined period is larger than the first set value Th1 and is detected before the predetermined period. The value obtained by subtracting the cycle low pressure Ps2 detected this time from the cycle low pressure Ps3 that is detected is greater than the second set value Th2, and both the detected outside temperature Tamb2 and the internal temperature Tcab2 detected this time are detected values Tamb3 and Tcab3 or more before a predetermined period. When the air volume mode Mcond2 of the condenser 4 detected this time is equal to or less than the air volume mode Meva3 detected before a predetermined period, and the air volume mode Meva2 of the evaporator 6 detected this time is equal to or higher than the air volume mode Meva3 detected before the predetermined period. It is determined that a circuit abnormality has occurred in the refrigeration cycle apparatus 2.

  According to this, the control device 15 sets the decrease range of the cycle high pressure Pd and the decrease range of the cycle low pressure Ps according to the refrigerant leakage amount predicted in the predetermined period as the first set value Th1 and the second set value Th2, respectively. I remember it. Therefore, if a large amount of refrigerant leaks from the design-predicted refrigerant leakage amount due to a circuit abnormality of the refrigeration cycle apparatus 2, the cycle high pressure Pd is greatly reduced from the first set value Th1, and the cycle low pressure Ps is 2 Lower than the set value Th2. However, when the outside air temperature Tamb is low, or when the air volume mode Mcond of the condenser 4 is large, the cycle high pressure Pd may be significantly lower than the first set value Th1. Further, when the inside air temperature Tcab is low, or when the air volume mode Meva of the evaporator 6 is small, the cycle low pressure Ps may be greatly decreased from the second set value Th2. Therefore, in such a case, the control device 15 can determine the circuit abnormality early and accurately at a stage where the refrigerant leaks more than the design leakage amount predicted in the predetermined period while avoiding the circuit abnormality determination. Is possible. In addition, the circuit abnormality is, for example, an abnormality in which the refrigerant is likely to leak due to deterioration of the rubber hose / packing, an abnormality in the air volume passing through the evaporator (for example, abnormal stop of the blower, clogging of the air filter) It refers to an abnormal decrease in the refrigerant flow rate (for example, an abnormality in an expansion valve, clogging of liquid piping).

  (2) In 2nd Embodiment, the alerting | reporting part 16 alert | reports a circuit abnormality with respect to a passenger | crew etc., when the control apparatus 15 determines that the circuit abnormality has generate | occur | produced in the refrigerating-cycle apparatus 2. FIG. According to this, when the notification unit 16 notifies the circuit abnormality, the occupant, the dealer, or the like can perform a prompt and appropriate response such as searching for and repairing the refrigerant leakage point.

(Other embodiments)
The present invention is not limited to the embodiment described above, and can be appropriately changed within the scope described in the claims. Further, the above embodiments are not irrelevant to each other, and can be combined as appropriate unless the combination is clearly impossible. In each of the above-described embodiments, it is needless to say that elements constituting the embodiment are not necessarily essential unless explicitly stated as essential and clearly considered essential in principle. Yes. Further, in each of the above embodiments, when numerical values such as the number, numerical value, quantity, range, etc. of the constituent elements of the embodiment are mentioned, it is clearly limited to a specific number when clearly indicated as essential and in principle. The number is not limited to the specific number except for the case. Further, in each of the above embodiments, when referring to the shape, positional relationship, etc. of the component, etc., the shape, unless otherwise specified and in principle limited to a specific shape, positional relationship, etc. It is not limited to the positional relationship or the like.

  For example, in the description of the first embodiment, the processes of steps S40 to S80 may be performed in a reversed order. In the description of the second embodiment, the processes of steps S140 to S180 may be performed in a reversed order.

  Further, for example, in the description of the first and second embodiments, the processes of steps S100, S110, S200, and S210 may be omitted as appropriate.

(Summary)
According to the first aspect shown in part or all of the above-described embodiments, the monitoring system includes a refrigeration cycle in which a compressor, a condenser, an expansion valve, and an evaporator are connected by piping and mounted on a moving body. Monitor the device. The monitoring system includes a high pressure side pressure detector, a low pressure side pressure detector, an outside air temperature detector, an inside air temperature detector, and a control device. The high pressure side pressure detection unit detects the pressure of the refrigerant flowing in the high pressure side circuit from the discharge port of the compressor to the expansion valve in the refrigeration cycle apparatus. The low pressure side pressure detection unit detects the pressure of the refrigerant flowing through the low pressure side circuit from the expansion valve to the suction port of the compressor. The outside air temperature detection unit detects the air temperature outside the passenger compartment. The inside air temperature detecting unit detects the air temperature in the passenger compartment. The control device can set the air volume mode of the condenser and the air volume mode of the evaporator. In this configuration, the control device is configured such that the detection value of the high pressure side pressure detection unit is lower than the previous detection value, the detection value of the low pressure side pressure detection unit is lower than the previous detection value, and the detection value of the outside air temperature detection unit is equal to or higher than the previous detection value. When the detected value of the inside air temperature detection unit is equal to or higher than the previous detected value, the air volume mode of the condenser is equal to or lower than the previous air volume mode, and the air volume mode of the evaporator is equal to or higher than the previous air volume mode, the refrigeration cycle apparatus is It is determined that the flowing refrigerant is insufficient.

  According to the second aspect, the control device stores, as the first set value, the amount of decrease in the refrigerant pressure in the high-pressure circuit according to the refrigerant leakage amount predicted in the predetermined period, and the refrigerant leakage predicted in the predetermined period. The amount of decrease in the refrigerant pressure in the low-pressure circuit according to the amount is stored as the second set value. Then, the control device has a value obtained by subtracting the detection value detected this time from the detection value detected by the high pressure side pressure detection unit before the predetermined period is larger than the first set value, and the low pressure side pressure detection unit detects the detection value before the predetermined period. The value obtained by subtracting the detection value detected this time from the detection value is larger than the second set value, the detection value detected this time by the outside air temperature detection unit is equal to or greater than the detection value detected before a predetermined period, and the internal temperature detection unit detects this time The detected value is equal to or higher than the detected value detected before the predetermined period, the air volume mode of the condenser is equal to or lower than the air volume mode detected before the predetermined period, and the air volume mode of the evaporator is equal to or higher than the air volume mode detected before the predetermined period. When it is determined that a circuit abnormality has occurred in the refrigeration cycle apparatus.

  According to this, in the refrigeration cycle apparatus mounted on the moving body, the amount of refrigerant leaking in a predetermined period is predicted by design. For this reason, the range of decrease in the refrigerant pressure in the high-pressure side circuit and the range of decrease in the refrigerant pressure in the low-pressure side circuit according to the refrigerant leakage amount predicted for the predetermined period are set as the first set value and the second set value, respectively. It is possible to memorize. Therefore, the control device determines a circuit abnormality when the decrease in the refrigerant pressure in the high-pressure circuit in the predetermined period is greater than the first set value and the decrease in the refrigerant pressure in the low-pressure circuit is greater than the second set value. Is possible. The circuit abnormality is, for example, an abnormality in which the refrigerant is likely to leak due to deterioration of the rubber hose / packing, an abnormality in the air flow through the evaporator (for example, abnormal stop of the blower, clogging of the air filter), or the flow rate of the refrigerant (For example, abnormalities of expansion valves, clogged liquid piping).

  According to the third aspect, the monitoring system monitors the refrigeration cycle apparatus mounted on the moving body by connecting the compressor, the condenser, the expansion valve, and the evaporator with piping. The monitoring system includes a high pressure side pressure detector, a low pressure side pressure detector, an outside air temperature detector, an inside air temperature detector, and a control device. The high pressure side pressure detection unit detects the pressure of the refrigerant flowing in the high pressure side circuit from the discharge port of the compressor to the expansion valve in the refrigeration cycle apparatus. The low pressure side pressure detection unit detects the pressure of the refrigerant flowing through the low pressure side circuit from the expansion valve to the suction port of the compressor. The outside air temperature detection unit detects the air temperature outside the passenger compartment. The inside air temperature detecting unit detects the air temperature in the passenger compartment. The control device can set the air volume mode of the condenser and the air volume mode of the evaporator. In this configuration, the control device stores, as the first set value, the decrease in the refrigerant pressure of the high-pressure circuit according to the refrigerant leakage amount predicted for the predetermined period, and according to the refrigerant leakage amount predicted for the predetermined period. The range of decrease in the refrigerant pressure in the low-pressure side circuit is stored as the second set value. Then, the control device has a value obtained by subtracting the detection value detected this time from the detection value detected by the high pressure side pressure detection unit before the predetermined period is larger than the first set value, and the low pressure side pressure detection unit detects the detection value before the predetermined period. The value obtained by subtracting the detection value detected this time from the detection value is larger than the second set value, the detection value detected this time by the outside air temperature detection unit is equal to or greater than the detection value detected before a predetermined period, and the internal temperature detection unit detects this time The detected value is equal to or higher than the detected value detected before the predetermined period, the air volume mode of the condenser is equal to or lower than the air volume mode detected before the predetermined period, and the air volume mode of the evaporator is equal to or higher than the air volume mode detected before the predetermined period. When it is determined that a circuit abnormality has occurred in the refrigeration cycle apparatus.

  According to the fourth aspect, the monitoring system further includes a notification unit that performs a notification operation associated with the determination by the control device. According to this, the monitoring system can prompt a passenger or the like to perform maintenance or the like by the notification unit. Therefore, it is possible to prevent a failure of the equipment constituting the refrigeration cycle apparatus and to prevent customer complaints associated with a decrease in the air conditioning function.

  According to the fifth aspect, when the control unit determines that the refrigerant flowing through the refrigeration cycle apparatus is insufficient, the notification unit notifies the refrigerant shortage. Moreover, a notification part performs notification of circuit abnormality, when a control apparatus determines the circuit abnormality of a refrigerating-cycle apparatus. According to this, a passenger | crew, a dealer, etc. can perform replenishment of a refrigerant | coolant because an alerting | reporting part notifies that a refrigerant | coolant is insufficient. Furthermore, when the notification unit notifies the circuit abnormality, it is possible for an occupant, a dealer, or the like to perform a quick and appropriate response such as searching for and repairing the refrigerant leakage point.

  According to the sixth aspect, when the control device determines that the refrigerant of the refrigeration cycle device is insufficient, the control device performs control to reduce the load on the compressor. In general, when the refrigerant in the refrigeration cycle apparatus is insufficient, the load on the compressor increases, which may lead to failure of the compressor. Therefore, this monitoring system can prevent a compressor failure by performing control to reduce the load on the compressor when the refrigerant runs short.

DESCRIPTION OF SYMBOLS 1 Monitoring system 2 Refrigeration cycle apparatus 11 High pressure side pressure detection part 12 Low pressure side pressure detection part 13 Outside air temperature detection part 14 Inside air temperature detection part 15 Control apparatus

Claims (6)

A monitoring system that monitors a refrigeration cycle device (2) mounted on a moving body by connecting a compressor (3), a condenser (4), an expansion valve (5), and an evaporator (6) through a pipe (7). There,
A high pressure side pressure detector (11) for detecting the pressure (Pd) of the refrigerant flowing in the high pressure side circuit from the discharge port (31) of the compressor to the expansion valve in the refrigeration cycle apparatus;
A low pressure side pressure detector (12) for detecting the pressure (Ps) of the refrigerant flowing in the low pressure side circuit from the expansion valve to the suction port (32) of the compressor in the refrigeration cycle device;
An outside air temperature detector (13) for detecting the air temperature outside the passenger compartment (Tamb);
An internal air temperature detector (14) for detecting the air temperature (Tcab) in the passenger compartment;
A controller (15) capable of setting the air volume mode (Mcond) of the condenser and the air volume mode (Meva) of the evaporator, and
The control device includes:
The detection value (Pd2) of the high pressure side pressure detection unit is lower than the previous detection value (Pd1),
The detection value (Ps2) of the low pressure side pressure detection unit is lower than the previous detection value (Ps1),
The detection value (Tamb2) of the outside air temperature detection unit is equal to or more than the previous detection value (Tamb1),
The detection value (Tcab2) of the internal air temperature detection unit is equal to or greater than the previous detection value (Tcab1),
The air volume mode (Mcond2) of the condenser is equal to or lower than the previous air volume mode (Mcond1),
The monitoring system which determines that the refrigerant | coolant which flows through the said refrigerating-cycle apparatus is insufficient when the air volume mode (Meva2) of the said evaporator is more than the last air volume mode (Meva1). The control device stores, as a first set value (Th1), a decrease in the refrigerant pressure of the high-pressure circuit according to the refrigerant leakage amount predicted for a predetermined period, and according to the refrigerant leakage amount predicted for the predetermined period. In addition, a decrease range of the refrigerant pressure in the low-pressure side circuit is stored as a second set value (Th2),
A value obtained by subtracting the detection value (Pd2) detected this time from the detection value (Pd3) detected by the high pressure side pressure detection unit before a predetermined period is larger than the first set value,
A value obtained by subtracting the detection value (Ps2) detected this time from the detection value (Ps3) detected by the low-pressure side pressure detection unit before a predetermined period is larger than the second set value,
The detected value (Tamb2) detected this time by the outside air temperature detection unit is not less than the detected value (Tamb3) detected before a predetermined period,
The detected value (Tcab2) detected this time by the internal temperature detector is equal to or greater than the detected value (Tcab3) detected before a predetermined period,
The air volume mode (Mcond2) of the condenser is equal to or lower than the air volume mode (Mcond3) detected before a predetermined period,
The monitoring system according to claim 1, wherein when the air volume mode (Meva2) of the evaporator is equal to or higher than the air volume mode (Meva3) detected before a predetermined period, it is determined that a circuit abnormality has occurred in the refrigeration cycle apparatus. A monitoring system that monitors a refrigeration cycle device (2) mounted on a moving body by connecting a compressor (3), a condenser (4), an expansion valve (5), and an evaporator (6) through a pipe (7). There,
A high pressure side pressure detector (11) for detecting the pressure (Pd) of the refrigerant flowing in the high pressure side circuit from the discharge port (31) of the compressor to the expansion valve in the refrigeration cycle apparatus;
A low pressure side pressure detector (12) for detecting the pressure (Ps) of the refrigerant flowing in the low pressure side circuit from the expansion valve to the suction port (32) of the compressor in the refrigeration cycle device;
An outside air temperature detector (13) for detecting the air temperature outside the passenger compartment (Tamb);
An internal air temperature detector (14) for detecting the air temperature (Tcab) in the passenger compartment;
A controller (15) capable of setting the air volume mode (Mcond) of the condenser and the air volume mode (Meva) of the evaporator, and
The control device stores, as a first set value (Th1), a decrease in the refrigerant pressure of the high-pressure circuit according to the refrigerant leakage amount predicted for a predetermined period, and according to the refrigerant leakage amount predicted for the predetermined period. In addition, a decrease range of the refrigerant pressure in the low-pressure side circuit is stored as a second set value (Th2),
A value obtained by subtracting the detection value (Pd2) detected this time from the detection value (Pd3) detected by the high pressure side pressure detection unit before a predetermined period is larger than the first set value,
A value obtained by subtracting the detection value (Ps2) detected this time from the detection value (Ps3) detected by the low-pressure side pressure detection unit before a predetermined period is larger than the second set value,
The detected value (Tamb2) detected this time by the outside air temperature detection unit is not less than the detected value (Tamb3) detected before a predetermined period,
The detected value (Tcab2) detected this time by the internal temperature detector is equal to or greater than the detected value (Tcab3) detected before a predetermined period,
The air volume mode (Mcond2) of the condenser is equal to or lower than the air volume mode (Mcond3) detected before a predetermined period,
The monitoring system which determines that the circuit abnormality has generate | occur | produced in the said refrigerating-cycle apparatus when the air volume mode (Meva2) of the said evaporator is more than the air volume mode (Meva3) detected before the predetermined period.   The said monitoring system is a monitoring system as described in any one of Claim 1 thru | or 3 further provided with the alerting | reporting part (16) which performs alerting | reporting operation accompanying the determination of the said control apparatus. The notification unit
When the control device determines that the refrigerant flowing through the refrigeration cycle device is insufficient, it notifies the refrigerant shortage,
The monitoring system according to claim 4, wherein when the control device determines a circuit abnormality in the refrigeration cycle apparatus, the control system notifies the circuit abnormality.   The monitoring system according to any one of claims 1 to 5, wherein the control device performs control to reduce a load on the compressor when the refrigerant shortage of the refrigeration cycle device is determined.

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