JP2016013800A - Hybrid electric vehicle air conditioning control unit and hybrid electric vehicle air conditioning control method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress the frequent repetition of starting and stopping an internal combustion engine for heating the cabin of a hybrid electric vehicle.SOLUTION: A hybrid electric vehicle air conditioning control unit intermittently actuates an engine with optimum fuel economy so that a coolant temperature of the engine is kept in a predetermined heating temperature range in response to a heating request. Furthermore, the air conditioning control unit switches over between outdoor air circulation and indoor air circulation so that a humidity of a cabin is kept in a predetermined humidity range. The inside air circulation is kept as long as the humidity of the cabin does not exceed the predetermined humidity range, thereby suppressing a temperature reduction of the cabin and increasing the interval between actuation and stop of the engine. Moreover, it is possible to make effective use of energy by using an output of the internal combustion engine generated by actuating the engine with the optimum fuel economy for charging a power storage device.

Description

  The present invention relates to control of the temperature and humidity of a passenger compartment of a hybrid vehicle.

  In a hybrid vehicle including an electric motor and an internal combustion engine as a driving power source, the vehicle compartment is generally heated using the heat generated by the internal combustion engine. In order to maintain the calorific value required for heating the passenger compartment, the internal combustion engine is operated intermittently, and the cooling water temperature of the internal combustion engine is maintained within a certain temperature range.

  Regarding heating of the passenger compartment, Patent Document 1 proposes to increase the rotational speed of the internal combustion engine in response to the heating request at different rates of increase according to the output ratios of the electric motor and the internal combustion engine. According to Patent Document 1, even when a heating request is issued in a state where the output ratio of the internal combustion engine is low, the cooling water temperature can be raised early to satisfy the heating request.

JP 2012-35689 A

  When the passenger compartment is heated using heat generated by the internal combustion engine, the air conditioner heats the passenger compartment in an outside air circulation mode in which air outside the vehicle is circulated to the passenger compartment. Therefore, in the winter when the outside air temperature is low, the temperature of the passenger compartment and the temperature of the cooling water decrease in a short time after the operation of the internal combustion engine is stopped. If an attempt is made to maintain the cooling water temperature in a predetermined humidity region in such a situation, the start and stop of the internal combustion engine are repeated in a short period of time, and the driver and passengers may feel troublesome. Further, when the internal combustion engine is operated for heating the passenger compartment in a state where the traveling power can be covered by the output of the electric motor, the surplus output of the internal combustion engine is used for storing the battery. However, after the storage amount (SOC) of the battery reaches the upper limit, the surplus output of the internal combustion engine becomes useless, which causes a deterioration in fuel consumption.

  The present invention has been made to solve the above-described problems, and realizes heating of a passenger compartment with high energy efficiency while suppressing frequent repetition of starting and stopping of an internal combustion engine for passenger compartment heating of a hybrid vehicle. For the purpose.

  An air conditioning control device according to an embodiment of the present invention includes an internal combustion engine, a power storage device, an electric motor that operates as a power source using the power of the power storage device, and can charge the power storage device as a generator, and the internal combustion engine The present invention is applied to a hybrid vehicle including an air conditioner that heats a passenger compartment using engine coolant. The air-conditioning control device intermittently operates the internal combustion engine so that the cooling water temperature of the internal combustion engine is maintained in a predetermined heating temperature region under the heating request, with detection means for detecting a heating request for the passenger compartment Internal combustion engine operating means, humidity acquisition means for estimating or detecting the humidity of the passenger compartment, outside air circulation for taking outside air into the passenger compartment so that the humidity of the passenger compartment is maintained in a predetermined humidity region, and air in the passenger compartment And switching means for switching between the inside air circulation to be circulated.

  The internal combustion engine operating means is configured to operate the internal combustion engine at the optimum fuel efficiency under the heating request, while the air conditioning control device generates power with the surplus output of the internal combustion engine during the optimal fuel efficiency operation under the heating request. The power storage device further includes power storage control means for storing power.

  The outside air circulation consumes more heat energy than the inside air circulation. Therefore, when the internal combustion engine operating means is operating the internal combustion engine to raise the cooling water temperature under the heating request, the switching means applies the internal air circulation unless the humidity of the passenger compartment exceeds a predetermined humidity range. A temperature drop in the passenger compartment can be suppressed. As a result, the operation interval of the internal combustion engine due to the heating request becomes longer, the frequent repetition of starting and stopping of the internal combustion engine for heating the passenger compartment of the hybrid vehicle is suppressed, and the thermal energy required for heating can be saved.

1 is a schematic configuration diagram of a hybrid vehicle to which the present invention is applied. It is a flowchart explaining the heating control routine which the controller by embodiment of this invention performs. It is a flowchart explaining the air-conditioning control routine which a controller performs. It is a timing chart which shows transition of the cooling water temperature by conventional vehicle compartment heating control, and SOC. It is a timing chart which shows the execution result of an air-conditioning control routine and a heating control routine. It is a timing chart which shows another execution result of an air-conditioning control routine and a heating control routine.

  An air conditioning control device according to an embodiment of the present invention will be described with reference to the drawings.

  Referring to FIG. 1, a hybrid vehicle 1 to which an air conditioning control device is applied includes an engine 2 and an electric motor 3 as power sources. The rotational outputs of the engine 2 and the electric motor 3 are transmitted to the drive wheels via the transmission 4. The engine 2 is composed of a water-cooled internal combustion engine. A radiator 6 is provided for cooling the engine 2. The water jacket of the engine 2 and the radiator 6 are connected by a cooling passage. The cooling water circulates between the water jacket and the radiator 6 through the cooling passage according to the operation of the water pump, thereby cooling the engine 2.

  The hybrid vehicle 1 is equipped with a battery 10 as a power storage device. The battery 10 is connected to the electric motor 3 via the inverter 5. The inverter 5 rotates the electric motor 3 using the stored electric power of the battery 10 and charges the battery 10 by operating the electric motor 3 as a generator with respect to the rotation input from the engine 2 or the drive wheels. .

  An HVAC device 8 is mounted on the hybrid vehicle 1 for heating and air conditioning of the passenger compartment 7 of the hybrid vehicle 1. HVAC is an abbreviation for Heating, Ventilation, and Air Conditioning. The HVAC device 8 is provided with a PTC heater 9 as an electric heating device that operates with the stored power of the battery 10. The PTC heater 9 is a heater using a PTC element that increases the resistance as the temperature rises. PTC is an abbreviation for Positive Temperature Coefficient.

  Operation control of the engine 2, drive control of the electric motor 3 through the inverter 5, charge control of the battery 10 through the inverter 5, control of the HVAC device 8 and the PTC heater 9, and shift control of the transmission 4 are performed by the controller 20. Done.

  The controller 20 includes a microcomputer having a central processing unit (CPU), a read only memory (ROM), a random access memory (RAM), and an input / output interface (I / O interface). It is also possible to configure the controller 20 with a plurality of microcomputers.

  The air conditioning control device is configured by each function of operation control of the engine 2 executed by the controller 20, charging control of the battery 10 via the inverter 5, and control of the HVAC device 8 and the PTC heater 9. The air conditioning control device includes a vehicle compartment temperature sensor 21, a vehicle compartment humidity sensor 22 as humidity acquisition means, an outside air temperature sensor 23, and a cooling water temperature sensor 24 for these controls. Each of these sensors is connected to the controller 20 by a signal circuit.

  Next, the control of the air conditioning and heating of the passenger compartment 7 performed by the controller 20 will be described.

  The controller 20 performs the following control when a heating request for the passenger compartment 7 is issued in the EV traveling mode in which the hybrid vehicle 1 is traveling by the operation of the electric motor 3. The heating request is issued, for example, when the temperature of the passenger compartment 7 falls below a set temperature.

  The control includes heating control for raising the temperature of the passenger compartment 7 to a specified temperature range, and air conditioning control for switching between outside air circulation for taking outside air into the passenger compartment 7 and inside air circulation for circulating the air in the passenger compartment 7.

  First, the basic control executed by the controller 20 will be described. The vehicle compartment 7 is basically heated by using heat generated by the operation of the engine 2. Specifically, the cooling water of the engine 2 is radiated by a radiator, and the temperature of the vehicle compartment 7 is raised by sending air warmed by the heat radiation to the vehicle compartment 7 using a blower fan.

  Therefore, the controller 20 raises the cooling water temperature to a predetermined region by performing the optimum fuel consumption operation of the engine 2 in response to the heating request of the passenger compartment 1. During this time, the controller 20 maintains the passenger compartment 7 in the inside air circulation mode via the HVAC device 8. In the inside air circulation mode, since the outside air is not introduced into the compartment 7, the temperature in the compartment 7 is unlikely to decrease. Therefore, the heat generated by the operation of the engine 2 can be efficiently used for heating the passenger compartment 7. When surplus occurs in the output of the engine 2 due to the optimal fuel efficiency operation, the controller 20 charges the battery 10 via the inverter 5 by rotationally driving the electric motor 3 as a generator.

  On the other hand, if the inside air circulation mode is continued, the humidity in the passenger compartment 7 increases due to water vapor generated by the driver or passenger in the passenger compartment 7. When the humidity in the passenger compartment 7 reaches the dew point, the water vapor is dewed and the window glass or the like is clouded. When the humidity in the passenger compartment 7 reaches the dew point, the controller 20 reduces the humidity in the passenger compartment 7 by switching the HVAC device 8 from the inside air circulation mode to the outside air circulation mode.

  In this way, the controller 20 operates the engine 2 intermittently so that the coolant temperature of the engine 2 is maintained in a predetermined temperature range, while the humidity in the passenger compartment 7 is maintained in the predetermined humidity region. The HVAC device 8 is controlled. By performing the inside air circulation within a range in which condensation does not occur in the passenger compartment 7, the temperature drop of the passenger compartment 7 is suppressed, and frequent repetition of intermittent operation of the engine 2 is suppressed.

  Further, the controller 20 operates the PTC heater 9 using the stored electric power of the battery 10 prior to the operation of the engine 2 for increasing the cooling water temperature when the charge amount SOC of the battery 10 has a margin. Thereby, the stop period of the engine 2 is lengthened.

  For the above control, the controller 20 executes the heating control routine shown in FIG. 2 and the air conditioning control routine shown in FIG. 3 in parallel.

  The heating control routine is executed using a heating request for the passenger compartment 7 as a trigger.

  Referring to FIG. 2, the controller 20 determines whether or not the cooling water temperature of the engine 2 is lower than the lower limit value β in step S <b> 1 in response to the heating request for the passenger compartment 7. Here, the lower limit value β corresponds to the lower limit value of the temperature range of the cooling water temperature necessary for heating the passenger compartment 7. The coolant temperature of the engine 2 is a value detected by the coolant temperature sensor 24.

  When the cooling water temperature is equal to or higher than the lower limit value β, the controller 20 stands by until the cooling water temperature falls below the lower limit value β. When the coolant temperature falls below the lower limit value β in step S1, the controller 20 starts the optimum fuel consumption operation of the engine 2 in step S2. Specifically, the controller 20 calculates an engine load capable of realizing the target cooling water temperature with minimum fuel consumption with reference to an optimal fuel consumption line map stored in advance in the ROM. Then, the engine 2 is operated under the calculated engine load.

  In step S3, the controller 20 determines whether or not the cooling water temperature has reached the upper limit value α. The upper limit value α corresponds to the upper limit value of the temperature range of the coolant temperature required for heating the passenger compartment 7.

  When the cooling water temperature has not reached the upper limit value α in step S3, the controller 20 waits until the cooling water temperature reaches the upper limit value α while continuing the operation of the engine 2. When the coolant temperature reaches the upper limit value α in step S3, the controller 20 stops the operation of the engine 2 in step S4.

  In the next step S5, the controller 20 determines whether or not the cooling water temperature is lower than the lower limit value β as in step S1. When the coolant temperature is equal to or higher than the lower limit value β, the controller 20 stands by until the coolant temperature falls below the lower limit value β while the operation of the engine 2 is stopped.

  In step S5, when the coolant temperature falls below the lower limit value β, the controller 20 determines in step S6 whether or not the charge amount SOC of the battery 10 is greater than or equal to the lower limit value min. The lower limit value min corresponds to a threshold value for determining whether to charge the battery 10 during the operation of the hybrid vehicle 1.

  If the charge amount SOC is equal to or greater than the lower limit value min, the controller 20 turns on the PTC heater 9 in step S7. As a result, the passenger compartment 7 is heated using the heat generated by the PTC heater 9. After the process of step S7, the controller 20 performs the process of step S8.

  On the other hand, when the charged amount SOC is lower than the lower limit value min in step S6, the controller 20 operates the engine 2 by repeating the processing after step S2, and heats the passenger compartment 7 by the heat generated by the engine 2. .

  In step S <b> 8, after the cooling water temperature falls below the lower limit value α, the controller 20 calculates a time during which the temperature of the outlet of the HVAC device 8 necessary for heating the passenger compartment 7 can be maintained only by the heat generated by the PTC heater 9. The temperature of the outlet required for heating the passenger compartment 7 is determined in advance from the target heating temperature of the passenger compartment 7 input to the HVAC device 8 and the outside air temperature detected by the outside air temperature sensor 23. Further, the time at which the outlet temperature can be maintained is determined from the difference between the temperature of the outlet and the outside air temperature, the amount of heat generated by the PTC heater 9 for maintaining this difference, and the amount of charge SOC of the battery 10. In other words, when the energy corresponding to the surplus with respect to the lower limit value min of the charge amount SOC is spent on the heat generation of the PTC heater 9 for maintaining the temperature of the passenger compartment 7, it is the time during which the temperature of the outlet can be maintained.

  In step S9, the controller 20 counts the elapsed time since the PTC heater 9 was turned on in step S7. In step S10, the controller 20 determines whether or not the elapsed time has reached the sustainable time calculated in step S8.

  If the determination in step S10 is negative, that is, if the elapsed time since turning on the PTC heater 9 is less than the time during which the temperature of the outlet can be maintained, the controller 20 repeats the processes in steps S9 and S10. As a result, the PTC heater 9 is kept on.

  If the determination in step S10 turns affirmatively, that is, if the elapsed time since turning on the PTC heater 9 reaches a time during which the temperature of the outlet can be maintained, the controller 20 turns off the PTC heater 9 in step S11. .

  In the next step S12, the controller determines whether the heating request is turned off. When the heating request is not OFF, that is, when the heating request is still ON, the controller 20 repeats the processes after step S1. If the heating request is OFF, the controller 20 ends the routine.

  Next, an air conditioning control routine executed by the controller 20 will be described with reference to FIG. This routine is started at the same time as the air supply switch of the HVAC device 8 is turned on. If the HVAC device 8 is configured so that the blower switch is turned on in conjunction with the heating request, the air conditioning control routine is always executed in parallel when the heating control routine of FIG. 2 is executed.

  In step S <b> 21, the controller 20 reads the humidity of the passenger compartment 7 detected by the passenger compartment humidity sensor 22.

  In step S22, the controller determines whether or not the humidity in the passenger compartment 7 is less than the upper limit value A of the humidity region that is the control target. The upper limit value A is set equal to, for example, the dew point at which water vapor in the passenger compartment 7 is dewed.

  If the determination in step S22 is affirmative, that is, if the humidity in the passenger compartment 7 is less than the upper limit A, the controller 20 instructs the HVAC device 8 to circulate the inside air in step S23. As a result, the HVAC device 8 performs air conditioning of the passenger compartment 7 in the inside air circulation mode in which the air in the passenger compartment 7 is circulated.

  In the next step S26, the controller 20 determines whether or not the blower switch is turned off. If the blower switch is OFF, the routine ends. On the other hand, if the blower switch remains ON, the controller 20 repeats the processes after step S21.

  If the determination in step S22 is negative, that is, if the humidity of the passenger compartment 7 has reached the upper limit value A, the controller 20 instructs the HVAC device 8 to circulate outside air in step S23. As a result, the HVAC device 8 air-conditions the passenger compartment 7 in the outdoor air circulation mode for taking outside air into the passenger compartment 7.

  In the next step S24, the controller 20 detects the humidity of the passenger compartment 7 again. In step S25, the controller 20 determines whether the humidity of the passenger compartment 7 is equal to or higher than the lower limit value B.

  If the determination is step S25, that is, if the humidity of the passenger compartment 7 is equal to or higher than the lower limit B, the controller 20 repeats the processing from step S23.

  On the other hand, when the humidity of the passenger compartment 7 becomes less than the lower limit value B in step S25, the controller 20 determines whether or not the blower switch is turned off in step S26. If the blower switch is OFF, the routine ends. On the other hand, if the blower switch remains ON, the controller 20 repeats the processes after step S21.

  As described above, in the air conditioning control device according to this embodiment, the controller 20 executes the heating control routine and the air conditioning control routine in parallel. In other words, the heating control of the passenger compartment 7 is executed in combination with the air conditioning control.

  Next, with reference to FIGS. 4-6, the effect | action which air conditioning control brings about the above heating control is demonstrated.

  Conventionally, the heating control is performed depending on the heat radiation of the engine 2 in the outside air circulation mode. An example of such conventional heating control will be first described below.

  Referring to FIG. 4, in the conventional heating control, the operation of the engine 2 is stopped when the coolant temperature of the engine 2 reaches the upper limit value α, and the engine 2 is operated when the coolant temperature of the engine 2 falls below the lower limit value β. The engine 2 was intermittently operated under the outside air circulation mode. When the operation of the engine 2 is stopped in the outside air circulation mode, the temperature in the passenger compartment 7 and the cooling water temperature are reduced in a short time, and as a result, the operation and stop of the engine 2 must be repeatedly performed at short intervals.

  Referring to FIG. 5, the air conditioning control device according to this embodiment executes the heating control routine and the air conditioning control routine in parallel, thereby performing the air conditioning by the internal air circulation until the humidity of the passenger compartment 7 reaches the upper limit value A. Do. Under the inside air circulation, cool outside air is not introduced into the passenger compartment 7, so an increase in the coolant temperature due to the operation of the engine 2 is promoted, and a decrease in the coolant temperature after the engine 2 is stopped is suppressed. Therefore, the cooling water temperature can maintain a water temperature region necessary for heating the passenger compartment 7 for a relatively long time, that is, a temperature region between the upper limit value α and the lower limit value β in the figure. That is, it is possible to suppress frequent start and stop of the engine 2 for heating the passenger compartment 7 during EV mode traveling.

  The operation of the engine 2 is performed by an optimal fuel consumption operation in which the target cooling water temperature is set to the upper limit value α. At this time, the surplus output of the engine 2 is used to drive the electric motor 3 as a generator, and the battery 10 is charged using the power generated by the electric motor 3. Therefore, the output of the engine 2 operated for heating can be used effectively.

  FIG. 5 shows a case where the charge amount SOC of the battery 10 has reached the lower limit min in step S6 of the heating control routine, and the passenger compartment 7 is heated only by heat generated during operation of the engine 2 without using the PTC heater 9. It corresponds to.

  Next, the control when the charge amount SOC of the battery 10 exceeds the lower limit value min will be described with reference to FIG.

  In FIG. 5, after the engine 2 stops operating, the engine 2 is operated when the coolant temperature falls below the lower limit value β. On the other hand, the example of FIG. 6 corresponds to the case where the process of steps S7 to S11 is performed and the PTC heater 9 is turned on when the charge amount SOC of the battery 10 exceeds the lower limit value min in step S6. To do. After the PTC heater 9 is turned on, heating by the PTC heater 9 is continued until the energy equivalent to the surplus with respect to the lower limit value min of the charge amount SOC of the battery 10 is consumed by the PTC heater 9. As a result, when the duration of the ON state of the PCT heater 9 reaches the sustainable time calculated in step S8, the PTC heater 9 is turned off in step S11, and the operation of the engine 2 is resumed in step S2.

  As described above, when the charge amount SOC of the battery 10 has a margin, the operation restart of the engine 2 can be delayed by heating the passenger compartment 7 using electric energy corresponding to the surplus. That is, the stop period of the engine 2 can be lengthened by delaying the temperature drop of the passenger compartment 7. As a result, frequent repetition of starting and stopping of the engine 2 is further suppressed.

  Further, by applying the sustainable time, when the charge amount SOC of the battery 10 decreases to the lower limit value min, the PTC heater 9 is turned off. Therefore, the charging power of the battery 10 can be used effectively without excessively consuming the charge amount SOC of the battery 10 for heating the passenger compartment 7.

  Further, the air conditioning control device calculates the required temperature of the air outlet to the passenger compartment of the air conditioner from the heating request, and can maintain the required temperature of the air outlet from the required temperature of the air outlet and the charge amount SOC of the battery 10. Time is calculated. And when sustainable time passes, it determines with charge amount SOC having reached the lower limit min. Therefore, it is possible to easily determine that the charge amount SOC has reached the lower limit value min without sequentially monitoring the charge amount SOC.

  Also in FIG. 6, when surplus is generated in the output of the engine 2 in the process of increasing the cooling water temperature by operating the engine 2 at the optimum fuel consumption, the engine 2 in the section indicated as “additional power generation” in the figure. The electric motor 3 is driven as a generator with surplus output, and the battery 10 is charged. Thereby, the surplus output of the engine 2 can be used effectively.

  As described above, according to the air conditioning control device for the hybrid vehicle 1 according to the embodiment of the present invention, the humidity in the passenger compartment 7 is maintained in the predetermined target humidity region in parallel with the heating control by intermittent operation of the engine 2. In this way, the inside air circulation and the outside air circulation of the air conditioning are switched. Since the heating efficiency of the passenger compartment 7 is high under the inside air circulation and the temperature of the passenger compartment 7 is not easily lowered even when the engine 2 is stopped, the engine 2 is compared with the case where the heating control is performed under the outside air circulation. The driving interval can be expanded. As a result, frequent repetition of starting and stopping of the engine 2 for heating the passenger compartment 7 is suppressed.

  Further, even when the operation of the engine 2 becomes necessary due to a decrease in the cooling water temperature, the air conditioning control device first heats the vehicle compartment 7 by the PTC heater 9 using the surplus amount of charge of the charge amount SOC of the battery 10. Thereafter, the operation of the engine 2 is resumed. Therefore, it becomes possible to make the stop time of the engine 2 longer, and the frequent repetition of starting and stopping of the engine 2 for heating the passenger compartment 7 can be further suppressed.

  Further, the air conditioning control device switches between the inside air circulation and the outside air circulation so that the humidity of the passenger compartment 7 is maintained in the target humidity region by executing the air conditioning control routine. Furthermore, the upper limit A of the target humidity region is set equal to the dew point. Therefore, the humidity of the passenger compartment 7 does not increase excessively, and a favorable effect is obtained in preventing fogging of the window glass of the passenger compartment 7.

  As described above, the present invention has been described through specific embodiments. However, the present invention is not limited to the above embodiments. Those skilled in the art can make various modifications or changes to these embodiments within the scope of the claims.

  For example, in the embodiment described above, the heat generated by the engine 2 and the heat generated by the PTC heater 9 are used for heating the passenger compartment. However, the present invention can also be applied to a hybrid vehicle that heats the passenger compartment only by the heat generated by the engine 2. In that case, what is necessary is just to implement in parallel the heating control routine which omitted step S6-S11 of FIG. 2, and the air-conditioning control routine of FIG. Even in such a case, as shown in FIG. 5, it is possible to obtain a certain effect of suppressing frequent repetition of starting and stopping of the engine 2 for heating the passenger compartment 7 as compared with the conventional case.

  In the heating control routine of FIG. 2, the PTC heater 9 is turned off based on the sustainable time. However, the charge amount SOC of the battery 10 is sequentially monitored, and when the charge amount SOC decreases to the lower limit value min, the PTC It is also possible to turn off the heater 9.

  In the embodiment described above, the HVAC device 8 constitutes detection means for detecting a heating request for the passenger compartment. The controller 20 constitutes an internal combustion engine operating means, a switching means, a power storage control means, and an electric heating device control means.

DESCRIPTION OF SYMBOLS 1 Hybrid vehicle 2 Engine 3 Electric motor 4 Transmission 5 Inverter 6 Radiator 7 Car compartment 8 HVAC device 9 PTC heater 10 Battery 20 Controller 21 Car compartment temperature sensor 22 Car compartment humidity sensor 23 Outside air temperature sensor 24 Cooling water temperature sensor

Claims (7)

An internal combustion engine, a power storage device, and an electric motor that operates as a power source using the power of the power storage device, while charging the power storage device as a generator, and heating of a passenger compartment using cooling water of the internal combustion engine An air conditioning control device for a hybrid vehicle comprising:
Detecting means for detecting a heating request of the passenger compartment;
An internal combustion engine operating means for intermittently operating the internal combustion engine so that a cooling water temperature of the internal combustion engine is maintained in a predetermined heating temperature region under the heating request;
A humidity acquisition means for estimating or detecting the humidity of the passenger compartment;
Switching means for switching between outside air circulation for taking outside air into the cabin and inside air circulation for circulating the air inside the cabin so that the humidity of the cabin is maintained in a predetermined humidity region;
The internal combustion engine operating means is configured to perform an optimal fuel efficiency operation of the internal combustion engine under the heating request,
An air conditioning control device for a hybrid vehicle, further comprising power storage control means for generating power with a surplus output of the internal combustion engine during optimal fuel consumption operation under the heating request and storing the power in the power storage device.   An electric heating device that heats the passenger compartment using the charging power of the power storage device, a charge amount determination means that determines whether or not a charge amount of the power storage device exceeds a predetermined value, and the charge amount is the predetermined amount When the cooling water temperature falls below a predetermined heating temperature range in a state where the value is higher than the value, the electric heating device control is performed to start the electric heating device and heat the passenger compartment prior to the operation of the internal combustion engine. The air conditioning control device for a hybrid vehicle according to claim 1, further comprising: means.   The electric heating device control means is configured to stop the operation of the electric heating device when the amount of charge reaches a predetermined lower limit as a result of heating the passenger compartment by the electric heating device. The air conditioning control device for a hybrid vehicle according to claim 2.   The electric heating device control means calculates the required temperature of the outlet to the passenger compartment of the air conditioner from the heating request, detects the amount of charge of the charging device, the required temperature of the outlet and the amount of charge A sustainable time during which the required temperature of the air outlet can be maintained is calculated from, and it is determined that the amount of charge has reached a predetermined lower limit when the maintainable time has elapsed. The air conditioning control device for a hybrid vehicle according to 3.   The air conditioning control device for a hybrid vehicle according to any one of claims 1 to 4, wherein the upper limit value of the predetermined humidity range is a humidity corresponding to a dew point.   The switching means is configured to apply the inside air circulation while the internal combustion engine operating means is operating the internal combustion engine under the heating request, as long as the humidity of the passenger compartment does not exceed the predetermined humidity region. 6. The air conditioning control device for a hybrid vehicle according to claim 1, wherein the air conditioning control device is a hybrid vehicle. An internal combustion engine, a power storage device, and an electric motor that operates as a power source using the power of the power storage device, while charging the power storage device as a generator, and heating of a passenger compartment using cooling water of the internal combustion engine And an air conditioning control method for a hybrid vehicle comprising:
Detects heating requests in the passenger compartment
The internal combustion engine is intermittently operated so that the cooling water temperature of the internal combustion engine is maintained in a predetermined heating temperature region under the heating request,
Estimate or detect the humidity in the passenger compartment,
In order to maintain the humidity of the passenger compartment in a predetermined humidity range, switching between the outside air circulation for taking outside air into the passenger compartment and the inside air circulation for circulating the air inside the passenger compartment,
When the internal combustion engine is operated under the heating request, the internal combustion engine is operated at an optimum fuel efficiency,
An air conditioning control method for a hybrid vehicle, wherein power generation is performed with a surplus output of the internal combustion engine that is operating under optimal fuel efficiency under the heating request and is stored in the power storage device.

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