JP2014125111A - Air conditioner, air conditioner control method, and program - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an air conditioner for adjusting a distribution balance of first refrigerant to be supplied to an evaporator and a chiller arranged in parallel.SOLUTION: A first evaporator 12 and a second evaporator 13 into which first refrigerant flows are arranged in parallel. If an absolute value of a first temperature difference between a temperature of second refrigerant evaporating the first refrigerant in the second evaporator 13 and a temperature of a fluid evaporating the first refrigerant in the first evaporator 12 is greater than a first predetermined value, a refrigerant pump 21 controls a flow volume of the second refrigerant.

Description

  The present invention relates to an air conditioner.

  Conventionally, Patent Document 1 discloses an air conditioner in which an evaporator of a front seat air conditioning unit and an evaporator of a rear seat air conditioning unit are arranged in parallel.

JP 2004-155391 A

  In the above technique, when the temperature of the evaporator of the front seat side air conditioning unit and the temperature of the evaporator of the rear seat side air conditioning unit are different, the distribution flow rate of the refrigerant flow rate is poor and the refrigerant flow rate is biased. The refrigerant flow rate of the compressor that causes the refrigerant to flow into the evaporator is controlled to suppress the refrigerant flow rate from being insufficient in the evaporator.

  However, even if the refrigerant flow rate of the compressor is controlled, there is a problem that the deviation of the refrigerant flow rate between the evaporator of the front seat air conditioning unit and the evaporator of the rear seat air conditioning unit cannot be resolved.

  The present invention was invented in view of such problems, and an object of the present invention is to eliminate unevenness in the flow rate of refrigerant flowing into an evaporator in an air conditioner in which a plurality of evaporators are arranged in parallel.

  An air conditioner according to an aspect of the present invention includes a first evaporator, a second evaporator disposed in parallel with the first evaporator, and a compressor that causes the first refrigerant to flow into the first evaporator and the second evaporator. A first expansion valve that adjusts the flow rate of the first refrigerant flowing into the first evaporator, a second expansion valve that adjusts the flow rate of the first refrigerant flowing into the second evaporator, and a second that cools the heat source. A refrigerant pump for circulating the refrigerant, flow rate control means for controlling the flow rate of the second refrigerant by the refrigerant pump, first temperature detection means for detecting the temperature of the fluid that evaporates the first refrigerant in the first evaporator, A second temperature detecting means for detecting the temperature of the second refrigerant that evaporates the first refrigerant in the evaporator, and the flow rate control means has an absolute value of the first temperature difference between the temperature of the second refrigerant and the temperature of the fluid. When it becomes larger than the first predetermined value, the flow rate of the second refrigerant is reduced by the refrigerant pump. To your.

  An air conditioner according to another aspect of the present invention is disposed in parallel with a first evaporator, a first temperature expansion valve that adjusts the flow rate of the first refrigerant flowing into the first evaporator, and the first evaporator. A second evaporator, a second temperature expansion valve that adjusts the flow rate of the first refrigerant flowing into the second evaporator, and a compressor that causes the first refrigerant to flow into the first evaporator and the second evaporator. A low water temperature cycle having a refrigeration cycle having an annular flow path through which the second refrigerant flows, a heat source disposed in the flow path, and a refrigerant pump for circulating the second refrigerant, and the temperature of the second refrigerant The absolute value of the first temperature difference between the fluid and the temperature of the fluid is greater than the first predetermined value, and the temperature of the fluid after the first refrigerant is evaporated by the first evaporator and the first temperature by the first evaporator. When the second temperature difference from the target temperature of the fluid after evaporating the refrigerant is larger than the second predetermined value, Reduce the flow rate of the refrigerant.

  The control method of the air-conditioning apparatus according to still another aspect of the present invention includes a first evaporator, a second evaporator disposed in parallel with the first evaporator, a first evaporator and a second evaporator. A compressor for injecting refrigerant, a first expansion valve for adjusting the flow rate of the first refrigerant flowing into the first evaporator, a second expansion valve for adjusting the flow rate of the first refrigerant flowing into the second evaporator, and a heat source A control method for an air conditioner that controls an air conditioner including a refrigerant pump that circulates a second refrigerant that cools the second refrigerant, wherein the temperature of a fluid that evaporates the first refrigerant is detected in the first evaporator, and the second evaporator The temperature of the second refrigerant that evaporates the first refrigerant is detected, and when the absolute value of the first temperature difference between the temperature of the second refrigerant and the temperature of the fluid becomes larger than the first predetermined value, the refrigerant pump Control the flow rate.

  A program according to still another aspect of the present invention includes a first evaporator, a second evaporator that is arranged in parallel with the first evaporator, evaporates the first refrigerant using heat of the second refrigerant, A compressor that causes the first refrigerant to flow into the evaporator and the second evaporator, a first expansion valve that adjusts a flow rate of the first refrigerant that flows into the first evaporator, and a flow rate of the first refrigerant that flows into the second evaporator A program for controlling the flow rate of the second refrigerant by a computer in an air conditioner including a second expansion valve that adjusts the refrigerant and a refrigerant pump that circulates the second refrigerant that cools the heat source. A first temperature detection procedure for detecting the temperature of the fluid that evaporates the first refrigerant in the evaporator, a second temperature detection procedure for detecting the temperature of the second refrigerant that evaporates the first refrigerant in the second evaporator, and the second refrigerant First temperature difference between the temperature of the fluid and the temperature of the fluid Absolute value to perform a flow control procedure for controlling the flow rate of the second coolant by larger the refrigerant pump than the first predetermined value.

  According to these aspects, when the flow rate of the first refrigerant is biased between the first evaporator and the second evaporator, the first refrigerant is supplied to the second evaporator by adjusting the flow rate of the second refrigerant by the refrigerant pump. It is possible to prevent the flow rate of the first refrigerant from being biased by adjusting the opening of the second expansion valve through which the refrigerant flows.

It is a system configuration figure of the air-conditioner of the electric vehicle of this embodiment. It is a figure which shows the refrigerant | coolant of an air conditioner, and the flow of cooling water. It is a figure which shows the refrigerant | coolant of an air conditioner, and the flow of cooling water. It is a flowchart for demonstrating the air-conditioning control of this embodiment. It is a flowchart for demonstrating the air-conditioning control of this embodiment.

  Hereinafter, an air conditioner 1 according to an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a system configuration diagram of an air conditioner 1 for an electric vehicle.

  The air conditioner 1 includes a refrigerant cycle 2 in which a first refrigerant circulates, a low water temperature cycle 3 in which a second refrigerant circulates, a high water temperature cycle 4 in which cooling water circulates, and a controller 5.

  The refrigerant cycle 2 includes a compressor 10, a condenser 11, an evaporator 12, a chiller 13, a first electromagnetic valve 14, a first expansion valve 15, a second electromagnetic valve 16, and a second expansion valve 17. Is done.

  The compressor 10 pressurizes the first refrigerant into a high temperature and high pressure gas. The compressor 10 operates with power supplied from a battery 20 described later.

  The condenser 11 exchanges heat between the first refrigerant pressurized by the compressor 10 and the cooling water circulating in the high water temperature cycle 4 to cool the first refrigerant and heat the cooling water. Thereby, the first refrigerant is liquefied.

  The evaporator 12 evaporates the first refrigerant cooled by the condenser 11. When the first refrigerant evaporates, the air outside the evaporator 12 is cooled. The first refrigerant turned into gas by the evaporator 12 is pressurized again by the compressor 10. The air cooled by the evaporator 12 is used for in-vehicle air conditioning during cooling (dehumidification).

  The first expansion valve 15 is a temperature type expansion valve, has a temperature-sensitive cylinder portion (not shown) on the outlet side of the evaporator 12, and opens according to superheat (refrigerant superheat degree) on the outlet side of the evaporator 12. The degree is adjusted, and the first refrigerant is injected into the evaporator 12 according to the opening degree. When the temperature of the air is high and the temperature on the outlet side of the evaporator 12 is high, the opening degree of the first expansion valve 15 is large. Even if the temperature of the first refrigerant flowing into the first expansion valve 15 is the same, the opening degree of the first expansion valve 15 increases as the flow rate of the air flowing outside the evaporator 12 increases.

  The first electromagnetic valve 14 opens and closes based on a signal from the controller 5.

  The chiller 13 evaporates the first refrigerant cooled by the condenser 11 by the heat of the second refrigerant. The second refrigerant flows outside the chiller 13, and the second refrigerant is cooled when the first refrigerant evaporates. The first refrigerant turned into gas by the chiller 13 is pressurized again by the compressor 10.

  The second expansion valve 17 is a temperature type expansion valve, has a temperature-sensitive cylinder portion (not shown) on the outlet side of the chiller 13, and the opening degree is adjusted according to the superheat on the outlet side of the chiller 13, The first refrigerant is injected into the chiller 13 according to the opening. When the temperature of the second refrigerant is high and the temperature on the outlet side of the chiller 13 is high, the opening degree of the second expansion valve 17 is large. Even if the temperature of the first refrigerant flowing into the second expansion valve 17 is the same, the opening degree of the second expansion valve 17 increases as the flow rate of the second refrigerant increases.

  The second electromagnetic valve 16 opens and closes based on a signal from the controller 5.

  The second electromagnetic valve 16, the second expansion valve 17, and the chiller 13 are arranged in parallel to the first electromagnetic valve 14, the first expansion valve 15, and the evaporator 12. Therefore, the first refrigerant pressurized by the compressor 10 branches upstream of the first solenoid valve 14 and the second solenoid valve 16 when the first solenoid valve 14 and the second solenoid valve 16 are open. The first expansion valve 15 and the second expansion valve 17 are injected into the evaporator 12 and the chiller 13. The injection amount to the evaporator 12 and the injection amount to the chiller 13 vary according to the opening degrees of the first expansion valve 15 and the second expansion valve 17. That is, when both solenoid valves 14 and 16 are open, the opening degree of both solenoid valves 14 and 16 is changed by the superheat of the evaporator 12 and the superheat of the chiller 13. The flow rate of the first refrigerant flowing into the evaporator 12 and the flow rate of the first refrigerant flowing into the chiller 13 change according to the opening degree.

  For example, when the evaporator 12 and the chiller 13 are the same size and both the solenoid valves 14 and 16 are open, and the superheat of the chiller 13 is larger than the superheat of the evaporator 12, the second expansion valve 17 The opening degree is larger than the opening degree of the first expansion valve 15, and a large amount of the first refrigerant flows through the chiller 13.

  The low water temperature cycle 3 includes a flow path 22 through which the second refrigerant flows, a battery 20, a chiller 13, and a first water pump 21.

  The first water pump 21 circulates the second refrigerant in the order of the battery 20 and the chiller 13. The first water pump 21 can switch the flow rate by a plurality of stages, and the flow rate of the second refrigerant increases as the number of stages increases.

  The battery 20 is a secondary battery that supplies electric power to the motor 38 and the like of the electric vehicle, and generates heat when charging and discharging. The battery 20 is cooled by the second refrigerant circulated by the first water pump 21.

  The second refrigerant whose temperature has been increased by cooling the battery 20 flows outside the chiller 13 and is absorbed when the first refrigerant evaporates by the chiller 13, and the temperature is lowered.

  The high water temperature cycle 4 includes a first cycle 7 and a second cycle 8. The first cycle 7 and the second cycle 8 are connected by a connection passage 32, and the communication state is changed by switching the three-way valve 30.

  The first cycle 7 includes a capacitor 11, a main heater 33, a heater core 34, and a second water pump 35.

  The main heater 33 can warm the cooling water with the electric power supplied from the battery 20.

  The heater core 34 exchanges heat with the first refrigerant by the condenser 11, and then exchanges heat between the cooling water heated by the main heater 33 and having a high temperature and the air around the heater core 34. Warm up. The air heated by the heater core 34 is used for in-vehicle air conditioning during heating. When the heating is OFF, the air mix door 36 prevents the air from hitting the heater core 34 and prevents the air from being warmed. A bypass passage may be provided so as to bypass the heater core 34.

  The second water pump 35 circulates the cooling water in the order of the condenser 11, the main heater 33, and the heater core 34. Further, when the first cycle 7 and the second cycle 8 are communicated by the three-way valve 30, the second water pump 35 causes the cooling water to flow into the radiator 37 and cools the cooling water.

  The second cycle 8 includes a radiator 37, a motor 38, an inverter 39, and a third water pump 40.

  The radiator 37 cools the cooling water with the air flowing outside.

  The inverter 39 mutually converts DC power and AC power, and controls the power supplied from the battery 20 to the motor 38 or the power supplied from the motor 38 to the battery 20. The inverter 39 is cooled by cooling water.

  The motor 38 is a three-phase AC motor, and functions as an electric motor by the electric power supplied from the battery 20, and functions as a generator when the vehicle is decelerated. The motor 38 is cooled by cooling water.

  The third water pump 40 circulates the cooling water in the order of the inverter 39, the motor 38, and the radiator 37.

  When the heat of the battery 20 is used at the time of heating, the heat of the battery 20 is gradually transmitted in the order of the second refrigerant, the first refrigerant, and the cooling water, the air is heated by the heater core 34, and the heated air is To supply. At this time, the three-way valve 30 switches the flow path so that the first cycle 7 and the second cycle 8 do not communicate with each other, and the second water pump 35 condenses the cooling water in the first cycle 7 as shown in FIG. 11, the main heater 33 and the heater core 34 are circulated in this order. The third water pump 40 circulates the cooling water in the second cycle 8 in the order of the inverter 39, the motor 38, and the radiator 37 to cool the inverter 39 and the motor 38. FIG. 2 shows a case where the waste heat of the battery 20 is reused for heating and the interior of the vehicle is dehumidified using the evaporator 12. In FIG. 2, the flow path through which the cooling water does not flow is indicated by a broken line for explanation.

  When the battery 20 is cooled and cooling is used as the vehicle interior air conditioning, the three-way valve 30 switches the flow path so that the first cycle 7 and the second cycle 8 communicate with each other, as shown in FIG. The second water pump 35 circulates the cooling water in the order of the radiator 37, the condenser 11, the main heater 33, and the heater core 34. In FIG. 3, the flow path through which the cooling water does not flow is indicated by a broken line for the sake of explanation. Note that the air is not applied to the heater core 34 by the air mix door 36.

  The controller 5 includes a main storage device such as a CPU and a RAM, and a computer-readable storage medium storing a program. Each function of the controller 5 is exhibited by the CPU reading and executing the program stored in the storage medium. The computer-readable storage medium is a magnetic disk, a magneto-optical disk, a CD-ROM, a DVD-ROM, a semiconductor memory, or the like.

  The controller 5 detects a signal from the first temperature sensor 51 for detecting the battery temperature Tb, a signal from the second temperature sensor 52 for detecting the temperature Tc of the second refrigerant before the chiller 13, and a signal before the evaporator 12. The first water pump 21 is based on a signal from the third temperature sensor 53 for detecting the air temperature Te1, a signal from the fourth temperature sensor 54 for detecting the air temperature Te2 after the evaporator 12, and the like. Control the flow rate. In addition, the controller 5 opens and closes the first electromagnetic valve 14 and the like based on a signal from an A / C switch (not shown) and switches the flow rate by the three-way valve 30.

  Next, air conditioning control of the air conditioner 1 of the present embodiment will be described using the flowcharts of FIGS. Here, it is assumed that cooling (dehumidification) is used as air conditioning in the vehicle and the battery 20 is cooled. Therefore, the first solenoid valve 14 and the second solenoid valve 16 are open.

  In step S100, the controller 5 determines whether or not the cooling is turned off based on a signal from the A / C switch. The process proceeds to step S103 when the cooling is turned off, and proceeds to step S101 when the cooling is turned on.

  In step S <b> 101, the controller 5 detects the temperature Te <b> 1 of the air before the evaporator 12 based on the signal from the third temperature sensor 53.

  In step S102, the controller 5 determines whether or not the temperature Te1 of the air before the evaporator 12 is equal to or higher than the first predetermined temperature. When the temperature Te1 of the air in front of the evaporator 12 is lowered, even if dehumidification is performed by the evaporator 12, the moisture contained in the air is small, so that it is hardly dehumidified. The first predetermined temperature is a temperature at which the dehumidifying performance by the evaporator 12 is lowered. The process proceeds to step S104 when the temperature Te1 of the air before the evaporator 12 is equal to or higher than the first predetermined temperature, and proceeds to step S103 when the temperature Te1 of the air before the evaporator 12 is lower than the first predetermined temperature.

  In step S103, the controller 5 closes the first electromagnetic valve 14.

  In step S <b> 104, the controller 5 detects the battery temperature Tb based on a signal from the first temperature sensor 51.

  In step S105, the controller 5 determines whether or not the battery temperature Tb is equal to or higher than the second predetermined temperature. The second predetermined temperature is set according to the type of the battery 20 or the like, and is a temperature at which it can be determined that the battery 20 needs to be cooled. The process proceeds to step S107 when the battery temperature Tb is equal to or higher than the second predetermined temperature, and proceeds to step S106 when the battery temperature Tb is lower than the second predetermined temperature.

  In step S106, the controller 5 closes the second electromagnetic valve 16 because the battery temperature Tb is low and the battery 20 need not be cooled.

  In step S <b> 107, the controller 5 detects the temperature Tc of the second refrigerant before the chiller 13 based on the signal from the second temperature sensor 52.

  In step S108, the controller 5 determines that the absolute value of the deviation (first temperature difference) between the temperature Tc of the second refrigerant before the chiller 13 and the temperature Te1 of the air before the evaporator 12 is the third predetermined temperature (first predetermined value). It is determined whether it is above. The third predetermined temperature is biased in the flow rate of the first refrigerant flowing into the chiller 13 and the flow rate of the first refrigerant flowing in the evaporator 12, and the flow rate of the first refrigerant is insufficient in the chiller 13 or the evaporator 12, and the cooling performance is reduced. The temperature may decrease. The process proceeds to step S109 when the absolute value of the deviation is equal to or higher than the third predetermined temperature, and ends this control when the absolute value of the deviation is lower than the third predetermined temperature.

  In step S109, the controller 5 determines whether or not the temperature Tc of the second refrigerant before the chiller 13 is higher than the temperature Te1 of the air before the evaporator 12. When the temperature Tc of the second refrigerant before the chiller 13 is higher than the temperature Te1 of the air before the evaporator 12, the controller 5 causes a large amount of the first refrigerant to flow into the chiller 13 and the flow rate of the first refrigerant is biased. Is determined. Further, when the temperature Tc of the second refrigerant before the chiller 13 is lower than the temperature Te1 of the air before the evaporator 12, the controller 5 causes a large amount of the first refrigerant to flow into the evaporator 12 and is biased to the flow rate of the first refrigerant. Is determined to occur. The process proceeds to step S110 when the temperature Tc of the second refrigerant before the chiller 13 is higher than the temperature Te1 of the air before the evaporator 12, and the temperature Tc of the second refrigerant before the chiller 13 is the air before the evaporator 12. If the temperature is lower than the temperature Te1, the process proceeds to step S117.

  In step S110, the controller 5 detects the temperature Te2 of the air after the evaporator 12 based on the signal from the fourth temperature sensor 54.

  In step S111, the controller 5 determines whether or not the deviation between the air temperature Te2 after the evaporator 12 and the target air temperature after the evaporator 12, that is, the target air-conditioning temperature Te2 ′ is lower than the fourth predetermined temperature. To do. The fourth predetermined temperature is a temperature at which the evaporator 12 can determine that the air is at the target air conditioning temperature, and is set in advance. The process ends this control if the deviation is lower than the fourth predetermined temperature, and proceeds to step S112 if the deviation is equal to or higher than the fourth predetermined temperature.

  In step S112, the controller 5 determines whether or not the battery temperature Tb is higher than the battery upper limit temperature Tb '. The battery upper limit temperature Tb 'is a preset temperature and is set according to the type of the battery 20 and the like. The battery upper limit temperature Tb ′ is set in consideration of the safety factor, and is set lower than the actual upper limit temperature of the battery 20. The process proceeds to step S113 when the battery temperature Tb is higher than the battery upper limit temperature Tb ', and proceeds to step S115 when the battery temperature Tb is equal to or lower than the battery upper limit temperature Tb'.

  In step S113, the controller 5 determines whether or not the flow rate of the second refrigerant by the first water pump 21 is the maximum flow rate. The process ends this control when the flow rate of the second refrigerant is the maximum flow rate, and proceeds to step S114 when the flow rate of the second refrigerant is not the maximum flow rate.

  In step S114, the controller 5 increases the stage number of the first water pump 21 by one stage from the current stage number, and increases the flow rate of the second refrigerant. Thereby, the battery 20 is further cooled. When the temperature Tc of the second refrigerant before the chiller 13 is higher than the temperature Te1 of the air before the evaporator 12 and the battery temperature Tb is higher than the battery upper limit temperature Tb ′, the battery temperature Tb is higher than the battery upper limit temperature Tb ′. The flow rate of the second refrigerant is increased so as to decrease.

  In step S115, the controller 5 determines whether or not the flow rate of the second refrigerant by the first water pump 21 is the minimum flow rate. The process ends this control if the flow rate of the second refrigerant is the minimum flow rate, and proceeds to step S116 if the flow rate of the second refrigerant is not the minimum flow rate.

  In Step S116, the controller 5 reduces the number of stages of the first water pump 21 by one from the current number of stages, and decreases the flow rate of the second refrigerant. When the flow rate of the first refrigerant is biased and flows into the chiller 13 in a large amount, the first refrigerant flowing into the evaporator 12 may be insufficient, and the flow rate of the second refrigerant by the first water pump 21 is not the minimum flow rate. The flow rate of the second refrigerant by the first water pump 21 is reduced, and the superheat of the chiller 13 is reduced. Thereby, the opening degree of the second expansion valve 17 is reduced, the first refrigerant flowing into the chiller 13 is reduced, the first refrigerant flowing into the evaporator 12 is increased, the distribution balance of the first refrigerant is adjusted, and the evaporator The air temperature Te2 after 12 can be set to the target air conditioning temperature Te2 ′.

  When it is determined in step S109 that the temperature Tc of the second refrigerant before the chiller 13 is lower than the temperature Te1 of the air before the evaporator 12, in step S117, the controller 5 determines that the battery temperature Tb is the battery upper limit temperature Tb ′. It is judged whether it is higher than. The process proceeds to step S118 when the battery temperature Tb is higher than the battery upper limit temperature Tb ', and ends this control when the battery temperature Tb is equal to or lower than the battery upper limit temperature Tb'.

  In step S118, the controller 5 determines whether or not the deviation (second temperature difference) between the air temperature Te2 after the evaporator 12 and the target air-conditioning temperature Te2 ′ is lower than the fourth predetermined temperature (second predetermined value). To do. The process proceeds to step S121 when the deviation is lower than the fourth predetermined temperature, and proceeds to step S119 when the deviation is equal to or higher than the fourth predetermined temperature.

  In step S119, the controller 5 determines whether or not the flow rate of the second refrigerant by the first water pump 21 is the minimum flow rate. The process ends this control if the flow rate of the second refrigerant is the minimum flow rate, and proceeds to step S120 if the flow rate of the second refrigerant is not the minimum flow rate.

  In step S120, the controller 5 decreases the number of stages of the first water pump 21 by one from the current number of stages, and decreases the flow rate of the second refrigerant. When the deviation between the air temperature Te2 after the evaporator 12 and the target air-conditioning temperature Te2 ′ is large and the flow rate of the second refrigerant is not the minimum flow rate in the first water pump 21, the flow rate of the second refrigerant is reduced, and the chiller Decrease 13 Superheat. Thereby, the opening degree of the second expansion valve 17 is reduced, the first refrigerant flowing into the chiller 13 is reduced, the first refrigerant flowing into the evaporator 12 is increased, the distribution balance of the first refrigerant is adjusted, and the evaporator The air temperature Te2 after 12 can be set to the target air conditioning temperature Te2 ′.

  In step S121, the controller 5 determines whether or not the flow rate of the second refrigerant by the first water pump 21 is the maximum flow rate. The process ends this control if the flow rate of the second refrigerant is the maximum flow rate, and proceeds to step S122 if the flow rate of the second refrigerant is not the maximum flow rate.

  In step S122, the controller 5 increases the stage number of the first water pump 21 by one stage from the current stage number, and increases the flow rate of the second refrigerant. The battery temperature Tb is higher than the battery upper limit temperature Tb ′, the deviation between the air temperature Te2 after the evaporator 12 and the target air conditioning temperature Te2 ′ is small, and the flow rate of the second refrigerant by the first water pump 21 is the maximum flow rate. If not, the battery 20 is further cooled by increasing the flow rate of the second refrigerant.

  The effect of the embodiment of the present invention will be described.

  In the air conditioner 1 in which the evaporator 12 and the chiller 13 are arranged in parallel and the first refrigerant is evaporated by the heat of the second refrigerant that cools the battery 20, the temperature Tc of the second refrigerant before the chiller 13 and the evaporator 12. When the absolute value of the deviation from the previous air temperature Te1 is equal to or higher than the third predetermined temperature, the flow rate of the second refrigerant by the first water pump 21 is controlled. Thereby, the superheat of the chiller 13 is adjusted, the opening degree of the second expansion valve 17 that injects the first refrigerant to the chiller 13 is changed, and the flow rate of the first refrigerant flowing into the chiller 13 and the first flow into the evaporator 12 are changed. The flow rate of one refrigerant is adjusted. In this way, the uneven flow rate of the first refrigerant can be suppressed, and the distribution balance of the flow rate of the first refrigerant can be adjusted. For example, when the temperature is high and the temperature of the battery 20 is higher than the temperature, and the first refrigerant flowing into the evaporator 12 is insufficient, the second refrigerant flowing into the chiller 13 can be reduced by reducing the flow rate of the second refrigerant. It is possible to reduce the flow rate of one refrigerant, increase the flow rate of the first refrigerant flowing into the evaporator 12, cool the air by the evaporator 12, and supply the cooled air to the vehicle interior. In this way, it is possible to suppress a deviation in the flow rate of the first refrigerant without increasing the flow rate of the first refrigerant by the compressor 10 and without increasing the power consumed by the compressor 10.

  When the deviation between the air temperature Te2 after the evaporator 12 and the target air-conditioning temperature Te2 'is equal to or higher than the fourth predetermined temperature, the flow rate of the first water pump 21 is decreased. Thereby, the temperature Te2 of the air after the evaporator 12 can be set to the target air conditioning temperature Te2 '.

  When the battery temperature Tb is higher than the battery upper limit temperature Tb ', the first water pump 21 increases the flow rate of the second refrigerant so that the battery temperature Tb becomes lower than the battery upper limit temperature Tb'. Thereby, it can suppress that the temperature of the battery 20 becomes high, and can suppress deterioration of the battery 20.

  The condenser 11 exchanges heat between the first refrigerant and the cooling water to warm the cooling water, and the heater core 34 exchanges heat between the cooling water and the air to warm the air. Can be supplied to. In this way, the heat accumulated in the battery 20 is transmitted to the cooling water via the second refrigerant and the first refrigerant, and further, the air is warmed by the cooling water to warm the vehicle interior, and the warmed air is supplied to the vehicle interior. Can do. For this reason, the cooling water is prevented from rapidly increasing due to the heat of the battery 20, and the heat of the battery 20 having a high temperature is effectively dissipated outside the vehicle by using, for example, the radiator 37, etc. Can be used.

  When the flow rate of the second refrigerant is increased or decreased by the first water pump 21, the rapid flow rate change of the first refrigerant flowing into the evaporator 12 can be suppressed by increasing or decreasing the flow rate of the second refrigerant for each stage. it can.

  The embodiment of the present invention has been described above. However, the above embodiment only shows a part of application examples of the present invention, and the technical scope of the present invention is limited to the specific configuration of the above embodiment. Absent.

  In the above embodiment, the flow rate of the second refrigerant is increased or decreased for each stage by the first water pump 21, but may be increased or decreased by a plurality of stages based on the temperatures of the evaporator 12 and the chiller 13. Thereby, when there is a bias in the flow rate of the first refrigerant flowing into the evaporator 12 and the chiller 13, the bias can be quickly adjusted. Further, the flow rate of the second refrigerant by the first water pump 21 may be continuously changed based on the temperatures of the evaporator 12 and the chiller 13.

  In the above embodiment, the air conditioner 1 for an electric vehicle is used as an example, but may be used for an air conditioner for a hybrid vehicle.

  In the above embodiment, the temperature Te1 of the air before the evaporator 12 is detected based on the signal from the third temperature sensor 53. However, the air temperature before the evaporator 12 is detected based on the outside air temperature, the room temperature, and the opening degree of the intake door. The temperature Te1 may be calculated.

  In the low water temperature cycle 3, as the second refrigerant, either liquid or gas refrigerant may be used. Further, the high water temperature cycle 4 is not limited to the cooling water, and a liquid or gaseous refrigerant may be used.

1 air conditioner 5 controller (flow rate control means, first temperature detection means, second temperature detection means, third temperature detection means)
10 Compressor 11 Condenser (First heat exchange means)
12 Evaporator (first evaporator)
13 Chiller (second evaporator)
15 First expansion valve 17 Second expansion valve 20 Battery (heat source)
21 1st water pump (refrigerant pump)
34 Heater core (second heat exchange means)

Claims (9)

A first evaporator;
A second evaporator disposed in parallel with the first evaporator;
A compressor for flowing a first refrigerant into the first evaporator and the second evaporator;
A first expansion valve for adjusting a flow rate of the first refrigerant flowing into the first evaporator;
A second expansion valve for adjusting the flow rate of the first refrigerant flowing into the second evaporator;
A refrigerant pump for circulating a second refrigerant for cooling the heat source;
Flow rate control means for controlling the flow rate of the second refrigerant by the refrigerant pump;
First temperature detecting means for detecting a temperature of a fluid that evaporates the first refrigerant in the first evaporator;
A second temperature detecting means for detecting a temperature of the second refrigerant that evaporates the first refrigerant in the second evaporator;
The flow rate control means controls the flow rate of the second refrigerant by the refrigerant pump when the absolute value of the first temperature difference between the temperature of the second refrigerant and the temperature of the fluid becomes larger than a first predetermined value. A featured air conditioner. The air conditioner according to claim 1,
The flow rate control means includes: a temperature of the fluid after the first refrigerant is evaporated by the first evaporator; and a target temperature of the fluid after the first refrigerant is evaporated by the first evaporator. When the second temperature difference is greater than a second predetermined value, the flow rate of the second refrigerant is reduced. The air conditioner according to claim 1 or 2,
A third temperature detecting means for detecting the temperature of the heat source;
When the temperature of the heat source is higher than the upper limit temperature, the flow rate control unit increases the flow rate of the second refrigerant so that the temperature of the heat source becomes lower than the upper limit temperature. . The air conditioner according to any one of claims 1 to 3,
First heat exchanging means for exchanging heat with the first refrigerant and warming the third refrigerant using heat of the first refrigerant;
An air conditioner comprising: second heat exchanging means for exchanging heat with the third refrigerant and warming air using heat of the third refrigerant. The air conditioner according to any one of claims 1 to 4,
The refrigerant pump can control the flow rate of the second refrigerant by a plurality of stages,
The air flow apparatus characterized in that the flow rate control means increases or decreases the flow rate of the second refrigerant for each stage. The air conditioner according to any one of claims 1 to 4,
The air flow control device, wherein the flow rate control unit controls the flow rate of the second refrigerant based on the first temperature difference. A first evaporator, a first temperature expansion valve for adjusting a flow rate of the first refrigerant flowing into the first evaporator, a second evaporator disposed in parallel with the first evaporator, the first evaporator A refrigeration cycle having a second temperature expansion valve that adjusts a flow rate of the first refrigerant flowing into the two evaporators, and a compressor that causes the first refrigerant to flow into the first evaporator and the second evaporator;
A low water temperature cycle having an annular flow path through which the second refrigerant flows, a heat source disposed in the flow path, and a refrigerant pump for circulating the second refrigerant,
The absolute value of the first temperature difference between the temperature of the second refrigerant and the temperature of the fluid is greater than a first predetermined value, and the fluid after the first refrigerant is evaporated by the first evaporator. When the second temperature difference between the temperature and the target temperature of the fluid after the first refrigerant is evaporated by the first evaporator is larger than a second predetermined value, the flow rate of the second refrigerant is decreased. An air conditioner characterized by that. A first evaporator;
A second evaporator disposed in parallel with the first evaporator;
A compressor for flowing a first refrigerant into the first evaporator and the second evaporator;
A first expansion valve for adjusting a flow rate of the first refrigerant flowing into the first evaporator;
A second expansion valve for adjusting the flow rate of the first refrigerant flowing into the second evaporator;
An air conditioner control method for controlling an air conditioner comprising a refrigerant pump for circulating a second refrigerant that cools a heat source,
Detecting the temperature of the fluid that evaporates the first refrigerant in the first evaporator;
Detecting the temperature of the second refrigerant that evaporates the first refrigerant in the second evaporator;
An air conditioner characterized in that when the absolute value of the first temperature difference between the temperature of the second refrigerant and the temperature of the fluid is greater than a first predetermined value, the flow rate of the second refrigerant is controlled by the refrigerant pump. Control method. A first evaporator;
A second evaporator disposed in parallel with the first evaporator and evaporating the first refrigerant using heat of the second refrigerant;
A compressor for allowing the first refrigerant to flow into the first evaporator and the second evaporator;
A first expansion valve for adjusting a flow rate of the first refrigerant flowing into the first evaporator;
A second expansion valve for adjusting the flow rate of the first refrigerant flowing into the second evaporator;
A program for controlling the flow rate of the second refrigerant by a computer in an air conditioner comprising a refrigerant pump for circulating the second refrigerant for cooling a heat source,
In the computer,
A first temperature detection procedure for detecting a temperature of a fluid that evaporates the first refrigerant in the first evaporator;
A second temperature detection procedure for detecting a temperature of the second refrigerant that evaporates the first refrigerant in the second evaporator;
When the absolute value of the first temperature difference between the temperature of the second refrigerant and the temperature of the fluid is greater than a first predetermined value, a flow rate control procedure for controlling the flow rate of the second refrigerant by the refrigerant pump is executed. A program characterized by

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