JP2009166646A - Regenerative car air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform air-conditioning without starting a compressor for a car air-conditioner by an internal combustion engine or other methods during an idling stop period, in a vehicle equipped with an idling stop function or the like. <P>SOLUTION: A cooler for an automobile is equipped with a compressor which compresses a refrigerant; a condenser which discharges heat of the refrigerant to the outside, an expansion valve which makes the refrigerant perform adiabatic expansion; and an evaporator which discharges cold heat of the refrigerant to air sent to inside the cabin. Heat is stored by installing a thermal storage device for storing heat and an expansion valve for leading the refrigerant apart from the expansion valve. Moreover, it includes a means to control the flow of the refrigerant according to the state of the thermal storage material when storing heat in the thermal storage device. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention enables a vehicle having an idling stop function and the like to be cooled and heated without starting a car air conditioner compressor by an internal combustion engine and other methods during idling stop.

  In order to meet the fuel efficiency and emission regulations that have been strengthened in North America, Europe, and Japan, technologies such as hybrid vehicles are currently being developed, and motors are used as car air conditioners during idling stops. There are a method for starting the compressor and a technique for starting only the blower fan without starting the compressor (for example, Patent Document 1).

JP-A-6-211036

  When air conditioning is performed during idling stop, a car air conditioner compressor may be started depending on conditions, but a power source such as an internal combustion engine or a motor is required to start the compressor. For this reason, when idling is stopped with air conditioning, the amount of power stored in the battery, etc., decreases rapidly, the internal combustion engine must be started, and the idling stop time is shortened. End up. In addition, when only the blower fan is activated, there is a problem that the driver feels uncomfortable because the wind with high humidity is sent.

  In order to solve the problem, a compressor that compresses the refrigerant, a condenser that releases the heat of the refrigerant to the outside, an expansion valve that adiabatically expands the refrigerant, and an evaporator that releases the cold heat of the refrigerant to the air sent into the vehicle interior In an automotive cooling device provided, a heat accumulator for storing heat is installed, and an expansion valve for guiding refrigerant to the heat accumulator is installed separately from the expansion valve to store heat. Moreover, a means for controlling the flow of the refrigerant according to the state of the heat storage material of the heat storage device is provided at the time of heat storage of the heat storage device.

  According to the present invention, it is possible to realize suitable cooling and heating without starting a power source such as an internal combustion engine or a motor during idling stop, preventing deterioration of fuel consumption and exhaust, and solving a driver's discomfort. it can.

  In the first aspect of the invention, the compressor that compresses the refrigerant, the condenser that releases the heat of the refrigerant to the outside, the first expansion valve that adiabatically expands the refrigerant, and the air blown into the vehicle interior by the cold heat of the refrigerant An automotive air conditioner comprising: an evaporator for cooling; a heat accumulator for storing heat; and a second expansion valve for guiding refrigerant to the heat accumulator separately from the first expansion valve. Sometimes, the second expansion valve is controlled according to the state of the heat storage material, and the air conditioner can be used without the assistance of another power source.

  The invention according to claim 2 is characterized in that the second expansion valve is controlled based on at least one of the outside air temperature and the temperature in the passenger compartment, and can be used by switching between cooling and heating. .

  The invention according to claim 3 is characterized in that the second expansion valve is throttled when at least one of the outside air temperature and the vehicle interior temperature setting is equal to or higher than a predetermined first predetermined temperature, and cooling is required. In this case, it can be suitably used for cooling.

  In the invention of claim 4, the second expansion valve is opened when at least one of the outside air temperature and the vehicle interior temperature setting is lower than a predetermined first predetermined temperature, and heating is required. In this case, it can be suitably used as heating.

  In a fifth aspect of the present invention, the temperature of the heat storage material is equal to or higher than a predetermined second or third predetermined temperature, and at least one of a water temperature or an oil temperature of the internal combustion engine is equal to or lower than a predetermined third predetermined temperature. The second expansion valve is opened, and heating can be used or the effect of defrosting can be enhanced even when the internal combustion engine is in a cold state.

  The invention according to claim 6 is characterized in that the second expansion valve is opened while the automobile is running, and the second expansion valve is closed when the heat storage material reaches a predetermined fourth predetermined temperature. The amount of heat necessary for the heat storage material is accumulated during traveling, so that the temperature can be adjusted without requiring another power source during idle stop.

  The best mode of the present invention will be described below with reference to the drawings.

  FIG. 1 is a configuration diagram of a regenerative air conditioner according to the present invention, and an evaporator from an expansion valve 106 and a regenerator 105 for guiding refrigerant to a compressor 101, a condenser 102, an expansion valve 103, an evaporator 104, a regenerator 105, and a regenerator. 104 is configured with a pump 107 for transporting the refrigerant to 104, and further, with the controller 108, the flow of the refrigerant is configured according to the state of the heat storage material of the heat accumulator when the heat accumulator stores heat.

  The embodiment of the present invention will be described with reference to FIGS.

  FIG. 2 shows a flowchart in the embodiment of the present invention. In S201, it is determined whether or not the vehicle is in an idle stop state. As an example of the determination method, there is a method of determining an idle stop state when the ignition signal is ON and the vehicle speed is 0 km / h. If it is not in the idle stop state, this control is terminated. If it is in the idle stop state, the process proceeds to S202. In S202, the target in-vehicle temperature and the target heat storage material temperature are determined. In this embodiment, the target vehicle interior temperature is set to the set temperature of the air conditioner, but may be determined by an arbitrary method. The target heat storage material temperature is determined based on the target vehicle interior temperature and the vehicle interior temperature. This will be described in detail with reference to FIG. S203 is a step of monitoring the vehicle interior temperature. In S204, it is determined whether the vehicle interior temperature matches the target vehicle interior temperature. If they do not match, the process returns to S203. If they match, the process proceeds to S205. In S205, it is determined whether the heat storage material temperature matches the target heat storage material temperature. If they do not match, the process proceeds to S208 and normal air conditioner activation is performed. If they match, the process proceeds to S206. In S206, circulation of the heat storage material to the evaporator is started. In S207, the target vehicle interior temperature and the heat storage material temperature are compared. If the heat storage material temperature is lower than the target vehicle interior temperature, the process returns to S206 and the circulation of the heat storage material is continued. If the vehicle interior temperature is equal to or higher than the target vehicle interior temperature, the process proceeds to S208, and switching to normal air-conditioner activation ends. In addition, this flowchart is an example which starts an air conditioner as a cooling as an example. When starting as heating, in step S207, it is determined whether or not the heat storage material temperature is equal to or lower than the target vehicle interior temperature. If the temperature is lower, the process proceeds to S208, and the heat storage material is higher in temperature than the target vehicle interior temperature. In that case, the process returns to S206 and the circulation of the heat storage material is continued.

  FIG. 3 is an example of a method for determining the target heat storage material temperature. In S301, it is determined whether or not the outside air temperature is equal to or lower than the air conditioner set temperature. When the outside air temperature is higher than the air conditioner set value, the process proceeds to S302, where the cooling side setting is set, and the cooling target heat storage material temperature is determined in S304. On the other hand, if it is determined in S301 that the outside air temperature is equal to or lower than the air conditioner set temperature, the process proceeds to S303 to set the heating side, and in S304, the target heat storage material temperature on the heating side is determined. In the present embodiment, the target heat storage material temperature on the cooling side is −10 ° C., and the target heat storage material temperature on the heating side is 80 ° C. These temperatures are not limited to these values, and may be set arbitrarily.

  FIG. 4 shows an example of a time chart when the present invention is implemented. FIG. 4 is a time chart in the case of using as cooling. While the vehicle speed is higher than 0, the air conditioner is activated as cooling. In this state, when the vehicle speed is 0 and the engine is in the idling stop state, based on the target heat storage material temperature and the heat storage material temperature, if the heat storage material temperature is lower than the target value, the air conditioner is stopped and the heat storage material circulates to the evaporator for cooling. Function as. As a result, the temperature of the heat storage material gradually rises, and when it matches the temperature in the passenger compartment, it becomes impossible to function as cooling, so switching to normal air conditioner use.

  On the other hand, FIG. 5 shows a time chart when used as heating. While the vehicle speed is higher than 0, the air conditioner is activated as heating. In this state, when the vehicle speed is 0 and the engine is in the idling stop state, based on the target heat storage material temperature and the heat storage material temperature, if the heat storage material temperature is higher than the target value, the air conditioner is stopped and the heat storage material circulates to the evaporator for heating. Function as. As a result, the temperature of the heat storage material gradually decreases, and when it matches the vehicle interior temperature, it becomes impossible to function as heating.

  As described above, because it is used as air conditioning during idling stop, the temperature of the heat storage material can be adjusted during traveling, so that the temperature in the passenger compartment can be adjusted without starting the air conditioner during idling stop. And exhaust deterioration can be prevented.

  FIG. 6 illustrates a method for storing heat in the heat storage material during traveling. In S601, it is determined whether the vehicle speed is greater than 0 and the air conditioner is being activated. When the vehicle is stopped or the air conditioner is not activated, the heat storage material is not stored. When the condition is satisfied, the process proceeds to S602, and it is determined whether or not the outside air temperature is equal to or lower than the set temperature of the air conditioner. The processing from S602 to S605 is the same as that in FIG. In addition, as another method for determining the target heat storage material temperature, it may be determined whether the air conditioner is used for cooling or heating from the set temperature during activation of the air conditioner, and the target heat storage material temperature may be determined. . In S606, heat storage to the heat storage material is started. The heat storage method is performed by controlling the degree of opening of the expansion valve. This method is already a known technique and will not be described here. S607 determines whether the target heat storage material temperature and the heat storage material temperature are equal. When it is not equal, it returns to S606 and the heat storage to a heat storage material is continued. When temperature is equal, it progresses to S608 and heat storage of a thermal storage material is stopped.

  FIG. 7 is an example of a time chart during heat storage according to the present embodiment. A case where the air conditioner is activated as a cooling while the vehicle is running will be described. Accordingly, in the case of heating, the change in the target heat storage material temperature is opposite to that in FIG. The air conditioner signal is ON while the vehicle is running. During this time, a part of the refrigerant used in the air conditioner is supplied to the heat storage material, and the temperature of the heat storage material decreases. When the heat storage material temperature reaches the target heat storage material temperature, the heat storage of the heat storage material is terminated. Thereafter, when the vehicle stops and enters an idle stop state, the air conditioner is turned off and the vehicle interior is cooled by the heat of the heat storage material. Therefore, the temperature of the heat storage material gradually increases after the idle stop.

  The subsequent process is the same as in FIG.

The control block diagram of the control apparatus which makes one Embodiment of this invention is shown. The flowchart of the thermal storage type air-conditioner control of FIG. 1 is shown. The flowchart of the determination method of the target heat storage material temperature of FIG. 1 is shown. An example of the time chart at the time of implementing the flowchart of FIG. An example of the time chart at the time of implementing the flowchart of FIG. In the thermal storage type air conditioner control of FIG. 1, the time chart of the thermal storage method to a thermal storage material is shown. An example of the time chart at the time of implementing FIG.

Explanation of symbols

101 Compressor 102 Condenser 103 Expansion valve (for conventional air conditioner)
104 Evaporator 105 Regenerator 106 Expansion valve (for regenerator)
107 Heat storage material circulation pump

Claims (8)

  A compressor that compresses the refrigerant, a condenser that releases the heat of the refrigerant to the outside, a first expansion valve that adiabatically expands the refrigerant, an evaporator that cools the air blown into the vehicle interior by the cold heat of the refrigerant, and stores heat And a second expansion valve for guiding refrigerant to the heat accumulator separately from the first expansion valve, according to the state of the heat accumulator during heat accumulation of the heat accumulator A control device for a regenerative air conditioner, wherein the second expansion valve is controlled.   2. The control apparatus for a regenerative air conditioner according to claim 1, wherein the second expansion valve is controlled based on at least one of an outside air temperature and a temperature in the passenger compartment.   The control apparatus for a regenerative air conditioner according to claim 1 or 2, wherein the second expansion valve is throttled when at least one of an outside air temperature and a passenger compartment temperature is equal to or higher than a predetermined first predetermined temperature. .   The control apparatus for a regenerative air conditioner, wherein the first predetermined temperature is an air conditioner temperature.   The control of the regenerative air conditioner according to claim 1 or 2, wherein the second expansion valve is opened when at least one of an outside air temperature and a passenger compartment temperature is lower than a predetermined first predetermined temperature. apparatus.   5. When the temperature of the heat storage material is equal to or higher than a predetermined second predetermined temperature and at least one of the water temperature or the oil temperature of the internal combustion engine is equal to or lower than a predetermined third predetermined temperature according to claim 1, A control device for a regenerative air conditioner, wherein the expansion valve is opened.   The control apparatus for a regenerative air conditioner, wherein the third predetermined temperature is a temperature at which the internal combustion engine is determined to be cold when the internal combustion engine is started.   6. The vehicle according to claim 1, wherein the second expansion valve is opened during traveling of the automobile, and the second expansion valve is closed when the heat storage material reaches a predetermined fourth predetermined temperature. Control unit for regenerative air conditioner.

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