JP2019111902A - Vehicle air-conditioning management system - Google Patents

Abstract

To provide a vehicle air-conditioning management system capable of improving energy efficiency in an air-conditioning system using a thermal storage device.SOLUTION: A vehicle air-conditioning management system comprises: a heat pump mechanism 2 which has a predetermined air-conditioning load region or a load value allowing energy efficiency to be optimized when activated; a thermal storage section 3 configured to enable an indoor space to be air-conditioned with stored thermal energy; an air-conditioning control section 5 which performs air-conditioning of the indoor space through control of the heat pump mechanism 2 and the thermal storage section 3; and an air-conditioning load information acquisition section 4 which acquires required air-conditioning load information required in a vehicle. The air-conditioning control section selectively uses the heat pump mechanism 2 and the thermal storage section 3 so as to optimize coefficient of performance (COP) when performing air-conditioning on the basis of the required air-conditioning load information.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vehicle air conditioning management system.

  In an electric vehicle such as a hybrid car or an electric car equipped with a drive battery charged by an external power supply, when electricity stored in the drive battery is used for air conditioning in the vehicle compartment, the electric power is consumed by that amount, so it can travel The distance will be shortened. Therefore, an air conditioning control system has been developed which performs air conditioning using a heat storage device or the like separately in order to suppress power consumption from the drive battery. (Refer to patent documents 1 to 3)

JP-A-5-124443 JP, 2010-259308, A JP 2012-97997 A

  In the air conditioning control system using such a heat storage device, power consumption can be further reduced by adopting a heat pump mechanism as the air conditioning mechanism. Therefore, from the viewpoint of the cruising distance of the electrically powered vehicle, further efficiency improvement in such a vehicle air conditioning management system is required.

  The present invention has been made to solve such a problem, and an object thereof is to provide a vehicle air conditioning management system capable of further improving energy efficiency in an air conditioning control system using a heat storage device. It is a thing.

  The vehicle air conditioning management system for a vehicle according to this application example is an air conditioning management system for air conditioning the interior of a vehicle equipped with a battery for driving, and a compression unit that compresses a refrigerant by being supplied with power from the battery. A heat pump mechanism having a predetermined air conditioning load area or load value that improves energy efficiency when driven, a heat storage unit configured to air-condition the room by heat energy stored, the heat pump mechanism and the heat storage mechanism An air conditioning control unit that performs the air conditioning of the room by controlling at least one of the units; and an air conditioning load information acquisition unit that acquires requested air conditioning load information required for the vehicle, the air conditioning control unit A requested air conditioning load required for the vehicle based on the requested air conditioning load information is a lower limit value of the air conditioning load area or If the load value is lower, the room is air conditioned by the heat storage unit, and if the required air conditioning load is within the air conditioning load area or the load value, the heat pump mechanism is used to perform air conditioning of the room, and the required air conditioning is performed. When the load is higher than the upper limit value of the air conditioning load area or the load value, air conditioning of the room is performed by the heat storage unit and the heat pump mechanism.

  In the vehicle air conditioning management system of the vehicle according to the application example, the heat pump mechanism is driven only when the air conditioning control unit is in the required air conditioning load that can be driven in the predetermined air conditioning load region where the energy efficiency is good in the heat pump mechanism. It will be done. In particular, when the required air conditioning load is higher than the upper limit value of the predetermined air conditioning load area, the heat storage unit compensates the air conditioning load by an amount exceeding the upper limit value and the heat pump mechanism is driven within the predetermined air conditioning load area. Thus, the energy efficiency of the heat pump mechanism can be maintained well. On the other hand, when the required air conditioning load is lower than the lower limit value of the predetermined air conditioning load area, the inefficient drive by the heat pump mechanism can be suppressed by using only the heat storage portion.

  That is, according to the vehicle air conditioning management system for a vehicle according to the application example, energy efficiency can be further improved by using the heat storage unit.

It is a schematic block diagram of the air-conditioning management system for vehicles concerning the embodiment of the present invention. It is a flow path figure of a refrigerant at the time of heating. FIG. 5 is a flow chart of a refrigerant during cooling. It is a related figure of COP and an air conditioning load. It is a time chart which shows an example of selective use of heat pump and heat storage part at the time of air conditioning control execution concerning this embodiment.

  Hereinafter, an embodiment of the present invention will be described based on the drawings.

  As shown in FIG. 1, the vehicle air conditioning management system 1 mainly includes a heat pump mechanism 2, a heat storage unit 3, an air conditioning load information acquisition unit 4, and an air conditioning control unit 5.

  The heat pump mechanism 2 includes a condenser 10, an evaporator 11, a first switching valve 12, a receiver 13, a second switching valve 14, a heating expansion valve 15, an outboard evaporator 16, and an outboard condenser 17 on a heat pump circuit through which refrigerant circulates. , A compressor 18 (compression unit), and a cooling expansion valve 19 are provided.

  The condenser 10 and the evaporator 11 are provided in a wind guide duct 20 of a vehicle. A blower 21 for blowing air toward the indoor side is provided on the vehicle outside of the air guide duct 20. In the air guide duct 20, the evaporator 11 is disposed on the upstream side of the air flow, and the condenser 10 is disposed on the downstream side.

  The condenser 10 is a heat exchanger that exchanges heat between the refrigerant compressed and heated by the compressor 18 and the air passing through the air guide duct 20.

  The evaporator 11 is a heat exchanger that exchanges heat between the refrigerant decompressed and cooled by the cooling expansion valve 19 and the air passing through the air guide duct 20.

  The first switching valve 12 is a three-way valve capable of switching the destination of the refrigerant from the condenser 10 to either the outside condenser 17 or the receiver 13.

  The receiver 13 has a function of separating the liquid refrigerant and the gas refrigerant and taking out only the liquid refrigerant.

  The second switching valve 14 is a three-way valve capable of switching the destination of the refrigerant from the receiver 13 to either the outside evaporator 16 or the cooling expansion valve 19.

  The outdoor evaporator 16 is a heat exchanger which is provided with a heating expansion valve 15 immediately before it and exchanges heat between the refrigerant whose temperature has been lowered by the heating expansion valve 15 and the outside air.

  The external condenser 17 is a heat exchanger that exchanges heat between the high-temperature and high-pressure refrigerant and the outside air.

  The compressor 18 is driven by the power of a driving battery (not shown) to compress the refrigerant and discharge it to the condenser 10.

  The cooling expansion valve 19 decompresses the refrigerant and discharges it to the evaporator 11.

  Here, referring to FIG. 2 and FIG. 3, FIG. 2 shows the flow of the refrigerant during heating, and FIG. 3 shows the flow of the refrigerant during cooling. The flows of the refrigerant at the time of heating and cooling at 2 will be described.

  As shown in FIG. 2, at the time of heating, the high-temperature and high-pressure refrigerant compressed by the compressor 18 heats the air in the air guide duct 20 by the condenser 10 to send warm air into the room. The refrigerant subjected to heat exchange in the condenser 10 and cooled is sent to the receiver 13 via the first switching valve 12. Further, the refrigerant is depressurized from the receiver 13 via the second switching valve 14 by the heating expansion valve 15, absorbed by the outside evaporator 16 by the outside evaporator 16, returned to the compressor 18, and compressed again.

  On the other hand, as shown in FIG. 3, during cooling, the low-temperature low-pressure refrigerant decompressed by the cooling expansion valve 19 cools the air in the air guide duct 20 by the evaporator 11 to send cold air indoors. The refrigerant which has been heat-exchanged and heated by the evaporator 11 is sent to the compressor 18, compressed as necessary, and adjusted to an appropriate temperature by heating the cold air in the air guide duct 20 by the condenser 10.

  The refrigerant, which is cooled by heat exchange in the condenser 10, is sent to the condenser 17 outside the vehicle via the first switching valve 12, dissipates heat in the outside air, and is sent to the receiver 13. Furthermore, the refrigerant returns from the receiver 13 to the cooling expansion valve 19 via the second switching valve 14 and is decompressed again.

  Returning to FIG. 1, the heat storage unit 3 is configured to be able to air-condition the vehicle interior by the heat energy stored, and mainly, the heat storage unit 30, the heat storage heat exchanger 31, the heat storage unit 32, and the cold storage A heat exchanger 33 is provided.

  The heat storage unit 30 has a heat storage material, and mainly stores heat energy of thermal energy (hereinafter, referred to as thermal energy). The specific heat storage means is not particularly limited, and, for example, chemical heat storage, latent heat storage, and sensible heat storage are used.

  The heat storage heat exchanger 31 is connected to the heat storage portion 30 so as to be able to transmit heat, and is disposed on the air flow downstream side of the condenser 10 in the air guide duct 20. The heat storage heat exchanger 31 can transmit the thermal energy heat-exchanged with the air in the air guide duct 20 to the heat storage unit 30, and the thermal energy stored in the heat storage unit 30 is transferred to the air guide duct It is possible to heat the air within 20. Although not shown, an open / close valve that opens at the time of heat exchange and that closes when heat exchange is not performed is provided on the blowing upstream side of the heat storage heat exchanger 31.

  The cold storage section 32 has a heat storage material, and mainly stores heat energy of cold energy (hereinafter referred to as cold energy). The specific heat storage means is not particularly limited, and, for example, chemical heat storage, latent heat storage, and sensible heat storage are used.

  The cold storage heat exchanger 33 is connected to the cold storage portion 32 so as to be able to transfer heat, and is disposed in the air guide duct 20 on the downstream side of the evaporator 11 in the air blowing direction. The cold storage heat exchanger 33 is capable of transmitting the cold energy energy exchanged with the air in the wind guide duct 20 to the cold storage portion 32, and the cold energy stored in the cold storage portion 32 is transferred to the inside of the wind guide duct 20. It is possible to cool the air. Note that an open / close valve may be provided on the blowing upstream side of the heat storage heat exchanger 33.

  In the heat storage unit 3 configured in this way, for example, at the time of heating, the heat storage heat exchanger 31 absorbs thermal energy via the air heated by the condenser 10 and stores the heat energy in the heat storage unit 30. On the other hand, during cooling, the cold storage heat exchanger 33 absorbs cold energy via the air cooled by the evaporator 11 and stores it in the cold storage section 32.

  The air conditioning load information acquisition unit 4 is connected to, for example, an outside air temperature sensor and a vehicle interior temperature sensor (not shown), and the outside air temperature detected by these sensors, the room temperature, and the set temperature set by the driver or the like. And has a function of acquiring required air conditioning load information required for heating or cooling to a set temperature in the vehicle.

  The air conditioning control unit 5 is electrically connected to the compressor 18, actuators of various valves, and the air conditioning load information acquisition unit 4, controls the drive of each unit, and at least one of the heat pump mechanism 2 and the heat storage unit 3 By controlling, it is possible to control the air conditioning inside the car.

  In particular, in the air conditioning control unit 5 of the present embodiment, a predetermined air conditioning load region R in which the coefficient of performance (hereinafter referred to as COP) of energy efficiency is good in driving the heat pump mechanism 2 is stored in advance.

  For example, as shown in FIG. 4, the predetermined air conditioning load area R is set based on the relationship between the air conditioning load and the COP. In the relationship diagram shown in FIG. 4, the tendency of COP when the room temperature is fixed to the constant temperature Tin and the air conditioning load is changed is shown for each of the outside air temperatures Ta, Tb and Tc. The outside temperatures Ta, Tb, and Tc have a relationship of Ta> Tb> Tc.

  As apparent from FIG. 4, at each external temperature, there is an air conditioning load (best air conditioning load) at which COP peaks, and when the air conditioning load becomes higher than that, COP tends to gradually decrease. The predetermined air conditioning load area R is set to the air conditioning load area including the best air conditioning load of each external temperature.

  Then, based on the predetermined air conditioning load region R and the required air conditioning load information acquired by the air conditioning load information acquisition unit 4, the air conditioning control unit 5 selectively uses the heat pump mechanism 2 and the heat storage unit 3.

  Specifically, when the required air conditioning load is lower than the lower limit value Rmin of the predetermined air conditioning load range R, the air conditioning control unit 5 performs indoor air conditioning by the heat storage unit 3 and the air conditioning load range where the required air conditioning load is predetermined If in R, air conditioning of the room is performed by the heat pump mechanism 2, and if the required air conditioning load is higher than the upper limit value Rmax of the predetermined air conditioning load area R, air conditioning of the room is performed by the heat storage unit 3 and the heat pump mechanism 2. .

  Next, the operation and effects of the vehicle air conditioning management system 1 according to the present embodiment configured as described above will be described. The time chart which shows an example of proper use of the heat pump mechanism 2 and the thermal storage part 3 at the time of air-conditioning control execution which concerns on this embodiment at FIG. 5 is shown. In addition, air-conditioning control shown in FIG. 5 assumes that heating is shown as an example.

  Since the required air conditioning load (heating load) is lower than the lower limit value Rmin of the predetermined air conditioning load area R from time t1 to time t2 in FIG. 5, the air conditioning control unit 5 is stored in the heat storage unit 30 of the heat storage unit 3. Heating is performed using thermal energy.

  Since the required air conditioning load is within the predetermined air conditioning load region R from time t2 to time t3, the air conditioning control unit 5 performs heating using only the heat pump mechanism 2.

  Since the required air conditioning load is higher than the upper limit value Rmax of the predetermined air conditioning load area R from time t3 to time t4, heating is performed using the heat storage portion 3 and the heat pump mechanism 2. Specifically, of the required air conditioning load, the heat pump mechanism 2 is driven by the air conditioning load corresponding to the upper limit value Rmax of the predetermined air conditioning load area R, and the remaining required air conditioning load is compensated by the heat storage unit 3.

  Since the required air conditioning load falls below the lower limit value Rmin again from time t4 to time t5, the air conditioning control unit 5 performs heating using the thermal energy stored in the heat storage unit 30 of the heat storage unit 3.

  As described above, the air conditioning control unit 5 drives the heat pump mechanism 2 only when there is a required air conditioning load that can be driven in a predetermined air conditioning load region R where the energy efficiency is good in the heat pump mechanism 2. In particular, when the required air conditioning load is higher than the upper limit value Rmax of the predetermined air conditioning load range R, the heat storage unit 3 compensates for the air conditioning load exceeding the upper limit, and the heat pump mechanism 2 performs the predetermined air conditioning load range R By driving inside, the energy efficiency of the heat pump mechanism 2 can be maintained favorably.

  On the other hand, when the required air conditioning load is lower than the lower limit value Rmin of the predetermined air conditioning load area R, inefficient driving by the heat pump mechanism 2 can be suppressed by using only the heat storage unit 3.

  As described above, according to the vehicle air conditioning management system 1 of the present embodiment, energy efficiency can be further improved by using the heat storage unit 3.

  This completes the description of the embodiments of the present invention, but the aspects of the present invention are not limited to this embodiment.

  In the above embodiment, air conditioning control has been described taking heating as an example on the basis of FIG. 5, but the air conditioning control of the air conditioning management system according to the present invention is not limited to heating. And similar control is applicable.

  In the above embodiment, when the required air conditioning load is within the predetermined air conditioning load area R, the heat pump mechanism 2 is driven by the air conditioning load corresponding to the upper limit Rmax of the predetermined air conditioning load area R, and the remaining required air conditioning Although the load is compensated by the heat storage unit 3, it is not necessary to drive the heat pump mechanism 2 at the upper limit value Rmax of the predetermined air conditioning load region R. For example, the heat pump mechanism 2 may be driven with the best air conditioning load, and the remaining required air conditioning load may be compensated by the heat storage section 3.

  Further, in the above embodiment, the heat pump mechanism 2 and the heat storage unit 3 are selectively used based on the predetermined air conditioning load area R, but not limited to the area, a predetermined load value may be used. That is, based on the required air conditioning load information, if the required air conditioning load required by the vehicle is lower than the predetermined load value, the air conditioning control unit air-conditions the room by the heat storage unit, and the required air conditioning load is at the predetermined load value. In some cases, air conditioning of the room is performed by the heat pump mechanism, and when the required air conditioning load is higher than a predetermined load value, air conditioning of the room is performed by the heat storage unit and the heat pump mechanism. For example, as this predetermined load value, it is preferable to set it as the best air conditioning load.

DESCRIPTION OF SYMBOLS 1 Air conditioning management system for vehicles 2 Heat pump mechanism 3 Heat storage part 4 Air conditioning load information acquisition part 5 Air conditioning control part 10 Condenser 11 Evaporator 12 1st switching valve 13 Receiver 14 2nd switching valve 15 Heating expansion valve 16 Outside evaporator 17 Outside vehicle Condenser 18 compressor 19 expansion valve for cooling 30 heat storage unit 31 heat exchanger for heat storage 32 heat storage unit 33 heat exchanger for cold storage

Claims (1)

An air conditioning management system for air conditioning the interior of a vehicle equipped with a battery for driving, comprising:
A heat pump mechanism having a predetermined air conditioning load area or a load value that includes a compression unit that compresses a refrigerant by being supplied with electric power from the battery, and whose energy efficiency is good at the time of driving;
A heat storage unit configured to be capable of air-conditioning the room by heat energy stored therein;
An air conditioning control unit for performing air conditioning of the room by controlling at least one of the heat pump mechanism and the heat storage unit;
An air conditioning load information acquisition unit that acquires required air conditioning load information required for the vehicle;
The air conditioning control unit performs the air conditioning of the room by the heat storage unit when the required air conditioning load required for the vehicle is lower than the lower limit value of the air conditioning load area or the load value based on the required air conditioning load information. ,
When the required air conditioning load is in the air conditioning load area or the load value, the heat pump mechanism performs air conditioning of the room,
An air conditioning management system for a vehicle, wherein the heat storage unit and the heat pump mechanism air-condition the room when the required air conditioning load is higher than an upper limit value of the air conditioning load area or the load value.

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