JP5488277B2 - Air-conditioning system, idle determination system for air-conditioning pump used in the system - Google Patents

Description

  The present invention relates to an air conditioning system and an idling determination system for an air conditioning pump used in the system.

  2. Description of the Related Art Conventionally, in a vehicle equipped with a fuel cell, a technique for using waste heat of the fuel cell as a heat source for temperature adjustment in the passenger compartment is known. For example, cooling water flowing through a first hot water circuit (also referred to as “cooling circuit”) in which a fuel cell is disposed is supplied to a second hot water circuit (also referred to as “air conditioning circuit”) in which a heater core is disposed. A technique is known in which air whose temperature is adjusted by a heater core is blown into a vehicle interior (for example, Patent Document 1).

JP 2005-263200 A JP 2002-127734 A JP 2008-184996 A JP 2008-057340 A

  In general, the capacity of an air conditioning pump arranged in an air conditioning circuit is smaller than that of a cooling pump arranged in a cooling circuit. For this reason, when air (bubbles) in the air conditioning circuit or the cooling circuit is mixed into the air conditioning pump, the air conditioning pump may be idle. Further, once the air conditioner is idling, it may be difficult to remove the mixed air with the capacity of the air conditioner pump. Furthermore, even when idling occurs, it may be difficult to determine the occurrence itself.

  Therefore, this invention is made | formed in view of such a subject, and makes it the 1st objective to provide the technique which reduces generation | occurrence | production of idling in the air-conditioning pump arrange | positioned in the air-conditioning circuit. A second object of the present invention is to provide a technique for easily eliminating the idling even when idling occurs in the air conditioning pump. Furthermore, it is a third object to provide a technique that can easily determine whether or not the air conditioner is idling.

  SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Application Example 1] An air-conditioning system having a cooling pump for circulating refrigerant, a cooling circuit for cooling a fuel cell, and an air-conditioning circuit having an air-conditioning pump for circulating the refrigerant An air conditioning circuit in which a heat source used for adjusting the temperature of air blown into the room is disposed, a connected state in which a refrigerant flows between the cooling circuit and the air conditioning circuit, the cooling circuit, and the air conditioning A non-connected state where the refrigerant does not flow between the circuit and a switching unit capable of switching, and a control unit for controlling the air conditioning system,
When it is determined that idling has occurred in the air-conditioning pump, or when a predetermined condition that can cause idling is satisfied, the control unit drives the air-conditioning pump in the connected state, and the fuel cell An air conditioning system that drives the cooling pump at a rotational speed equal to or higher than a predetermined value regardless of the power generation state.

  According to the air conditioning system of Application Example 1, air (bubbles) mixed in the air conditioning pump can be extracted by feeding the liquid from the cooling circuit to the air conditioning circuit using the cooling pump. Thereby, the idle generation | occurrence | production of an air conditioning pump can be reduced. Moreover, even when idling occurs in the air conditioning pump, idling can be easily eliminated.

Application Example 2 In the air conditioning system according to Application Example 1, the predetermined condition is that the control unit accepts an air conditioning request for blowing air into the room and starts driving the air conditioning pump. Air conditioning system included as part condition.
When driving of the air conditioning pump is started in response to an air conditioning request, air staying in the air conditioning circuit may be mixed into the air conditioning pump and idle rotation may occur. According to the air conditioning system of Application Example 2, it is possible to reduce the idling of the air conditioning pump after the driving of the air conditioning pump is started.

[Application Example 3] The air conditioning system according to Application Example 1, wherein the predetermined condition includes, as a part of conditions, the control unit switching from the non-connected state to the connected state.
When switching from the unconnected state to the connected state, air in the cooling circuit may enter the air conditioning circuit, air may enter the air conditioning pump, and idle rotation may occur. According to the air conditioning system of Application Example 3, it is possible to reduce the occurrence of idling of the air conditioning pump when switching from the unconnected state to the connected state.

Application Example 4 In the air conditioning system according to Application Example 1, after passing through the heat source, a first temperature sensor for measuring the temperature of the preceding refrigerant that is the refrigerant before passing through the heat source. A second temperature sensor for measuring the temperature of the latter-stage refrigerant which is the refrigerant of
The control unit calculates a measured temperature difference, which is a temperature difference between the front-stage refrigerant and the rear-stage refrigerant, based on the measurement values of the first and second temperature sensors, and calculates the heat amount of the heat source and the air conditioning pump. Based on the rotational speed, an estimated temperature difference, which is a temperature difference between the preceding refrigerant and the latter refrigerant, is calculated, and based on the measured temperature difference and the estimated temperature difference, is the air conditioner pump idled? An air conditioning system that determines whether.
According to the air conditioning system of Application Example 4, it is possible to detect whether the refrigerant is flowing in the air conditioning circuit based on the measured temperature difference and the estimated temperature difference. Thereby, when the refrigerant is not flowing through the air conditioning circuit, it can be easily determined that the air-conditioning pump is idle.

Application Example 5 An idle determination system for an air-conditioning pump that is arranged in an air-conditioning circuit and circulates refrigerant in the air-conditioning circuit, and is a heat source that is used to adjust the temperature of air blown indoors, A heat source disposed in the circuit; a first temperature sensor for measuring a temperature of the preceding refrigerant that is the refrigerant before passing through the heat source; and a temperature of the latter refrigerant that is the refrigerant after passing through the heat source. A second temperature sensor for measuring the idle speed and a control unit for controlling the idling determination system,
The control unit calculates a measured temperature difference, which is a temperature difference between the front-stage refrigerant and the rear-stage refrigerant, based on the measurement values of the first and second temperature sensors, and calculates the heat amount of the heat source and the air conditioning pump. Based on the rotational speed, an estimated temperature difference, which is a temperature difference between the preceding refrigerant and the latter refrigerant, is calculated, and based on the measured temperature difference and the estimated temperature difference, is the air conditioner pump idled? An idling judgment system that judges whether or not.

  According to the idling determination system of Application Example 5, it is possible to detect whether the refrigerant is flowing in the air conditioning circuit based on the measured temperature difference and the estimated temperature difference. Thereby, when the refrigerant is not flowing through the air conditioning circuit, it can be easily determined that the air-conditioning pump is idle.

[Application Example 6] In the idling determination system according to Application Example 5, in the case where the difference between the measured temperature difference and the estimated temperature difference is larger than a predetermined threshold value, the control unit detects that the air-conditioning pump is idling. An idling determination system that determines that idling has occurred and determines that no idling has occurred in the air conditioning pump when the difference between the measured temperature difference and the estimated temperature difference is equal to or less than a predetermined threshold.
When the flow rate according to the rotation speed of the air conditioning pump flows through the air conditioning circuit, the difference between the measured temperature difference and the estimated temperature difference hardly occurs. Therefore, according to the idling determination system of Application Example 6, when the difference between the measured temperature difference and the estimated temperature difference is larger than the predetermined threshold, idling occurs in the air conditioning pump because refrigerant does not flow in the air conditioning circuit. Can be determined.

[Application Example 7] The idling determination system according to Application Example 5, wherein the control unit changes the rotation speed of the air conditioning pump, and the measured temperature difference before the change and the measured temperature after the change. A measured change value that is a difference from the difference is calculated, an estimated change value that is a difference between the estimated temperature difference before the change and the estimated temperature difference after the change is calculated, and the measured change value and the estimated When the difference between the change value is larger than a predetermined threshold, it is determined that the air-conditioning pump is idling. When the difference between the measurement change value and the estimated change value is less than a predetermined threshold, An idling determination system that determines that no idling has occurred in the air conditioning pump.
According to the idling determination system of Application Example 7, comparing a measured change value that is a difference in measured temperature difference before and after the change in the rotation speed of the air conditioning pump and an estimated change value that is a difference in estimated temperature difference before and after the change. Thus, it is possible to reduce false determination of idling due to temperature sensor measurement error.

[Application Example 8] The idling determination system according to Application Example 5, wherein the control unit changes the amount of heat of the heat source, the measured temperature difference before the change, and the measured temperature difference after the change. A measured change value that is a difference between the estimated temperature difference before the change and an estimated temperature difference after the change is calculated, and the measured change value and the estimated change value If the difference between the measured change value and the estimated change value is equal to or less than a predetermined threshold value, the air conditioning pump An idling determination system that determines that no idling has occurred.
According to the idling determination system of Application Example 8, by comparing a measured change value that is a difference in measured temperature difference before and after a change in the amount of heat of the heat source with an estimated change value that is a difference in estimated temperature difference before and after the change, It is possible to reduce erroneous determination of idling due to a measurement error of the temperature sensor.

Application Example 9 In the idling determination system according to any one of Application Examples 5 to 8, when the heat source includes a heating device that heats the refrigerant flowing through the air conditioning circuit, The control unit is an idling determination system that stops heating of the refrigerant by the heating device when it is determined that idling occurs in the air-conditioning pump.
According to the idling determination system of Application Example 9, it is possible to prevent the refrigerant in the air conditioning circuit from being excessively heated. Thereby, evaporation of a refrigerant | coolant can be prevented and generation | occurrence | production of the air in an air-conditioning circuit can be suppressed.

[Application Example 10] An air conditioning system including the idling determination system according to any one of Application Examples 5 to 9, wherein the cooling circuit includes a cooling pump for circulating a refrigerant, and is a fuel cell. Switching between a cooling circuit for cooling the refrigerant, a connected state in which refrigerant flows between the cooling circuit and the air conditioning circuit, and a non-connected state in which refrigerant does not flow between the cooling circuit and the air conditioning circuit An air conditioning control unit that controls the air conditioning system, and when the idling determination system determines that idling has occurred in the air conditioning pump, the air conditioning control unit, in the connected state, An air conditioning system that drives the cooling pump at a rotational speed equal to or higher than a predetermined value regardless of a power generation state of a battery.
According to the idling determination system of Application Example 10, the air mixed in the air conditioning pump can be removed by sending the liquid to the air conditioning circuit using the cooling pump. Thereby, idling of the air conditioning pump can be eliminated.

  The present invention can be realized in various forms. In addition to the configuration as the air conditioning system described above, the mobile body or house provided with any of the air conditioning systems described above, the control method of the air conditioning system, etc. It can be realized in a manner.

It is a figure which shows the structure of the air conditioning system 1 as an Example of this invention. It is a flowchart which shows operation | movement of the air conditioning system 1 at the time of an air conditioning drive start. It is a flowchart for demonstrating initial air bleeding operation | movement. It is a flowchart which shows operation | movement of the air conditioning system 1 in the air conditioning drive. It is a flowchart of idling determination of the 1st mode. It is a flowchart of idling determination of the 2nd mode. It is a figure for demonstrating step S190, S192. It is a flowchart which shows operation | movement of the air conditioning system 1 at the time of a connection start. It is a flowchart of idling determination of the 2nd modification.

Next, embodiments of the present invention will be described in the following order.
A. Example:
B. Variations:

A. Example:
A-1: System configuration:
FIG. 1 is a diagram showing a configuration of an air conditioning system 1 as an embodiment of the present invention. The air conditioning system 1 of the present embodiment is used for air conditioning of a fuel cell stack 100 (also simply referred to as “FC100”), a cooling circuit 10 in which cooling water for cooling the fuel cell stack 100 circulates, and a vehicle interior 40. The air conditioning circuit 20 through which the cooling water circulates, the first and second communication channels 216 and 218, the valve V3, and an ECU (Electronic Control Unit) 30 that controls the operation of the air conditioning system 1; Is mainly provided. The piping constituting the cooling circuit 10 has a larger inner diameter than the piping constituting the air conditioning circuit 20. In the case of the present embodiment, the inner diameter of the pipe constituting the cooling circuit 10 is Φ30 mm, and the inner diameter of the pipe constituting the air conditioning circuit 20 is Φ17 mm.

  Although not shown, the air conditioning system 1 includes a hydrogen supply / discharge system that supplies and discharges hydrogen as a fuel gas and an air supply / discharge system that supplies and discharges air as an oxidant gas. The hydrogen supply / discharge system supplies hydrogen to the anode of the fuel cell stack 100 and discharges the anode exhaust gas discharged from the fuel cell stack 100 to the outside of the system 1. The air supply / discharge system supplies air to the cathode of the fuel cell stack 100 and discharges the cathode exhaust gas discharged from the fuel cell stack 100 to the outside of the system 1.

  The fuel cell stack 100 is a polymer electrolyte fuel cell that is relatively small and excellent in power generation efficiency. Pure hydrogen as a fuel gas and oxygen contained in air as an oxidant gas cause an electrochemical reaction at each electrode. An electromotive force is obtained by waking up. The fuel cell stack 100 has a stack structure in which a plurality of single cells (not shown) are stacked with a separator (not shown) interposed, and the number of stacks is arbitrarily determined according to the output required for the fuel cell stack 100 It can be set.

  The cooling circuit 10 includes a first cooling channel 120, a second cooling channel 126, and a third cooling channel 128. The cooling circuit 10 adjusts the degree of opening of the valve V1 so that the cooling water flowing into the second cooling channel 126 from the outlet channel 124 of the first cooling channel 120 and the outlet channel The flow rate ratio with the cooling water flowing into the third cooling flow path 128 from 124 is adjusted.

  The first cooling flow path 120 has the fuel cell stack 100 disposed in the middle. Further, the first cooling flow path 120 includes an inlet side flow path 122 through which cooling water flowing into the fuel cell stack 100 flows and an outlet side flow path 124 through which cooling water flowing out from the fuel cell stack 100 flows. That is, the cooling circuit 10 is a circulation channel for circulating the cooling water that passes through the fuel cell stack 100.

  In the inlet-side flow path 122, a water pump WP1 (hereinafter also referred to as “FC pump WP1”) for circulating cooling water in the cooling circuit 10 and a temperature sensor 130 are arranged. The capacity of the FC pump WP1 is larger than the capacity of the water pump WP2 disposed in the air conditioning circuit 20 described later. In the case of the present embodiment, the FC pump WP1 has a capacity of a maximum flow rate of 150 L / min. The temperature sensor 130 is disposed in the vicinity of the cooling water inlet of the fuel cell stack 100 in the inlet-side flow path 122. A temperature sensor 132 is disposed in the vicinity of the coolant outlet of the fuel cell stack 100 in the outlet-side flow path 124. The temperature sensor 130 is mainly used to measure the cooling water temperature at the cooling water inlet of the fuel cell stack 100. The temperature sensor 132 is mainly used for measuring the coolant temperature at the coolant outlet of the fuel cell stack 100. Here, the FC pump WP1 corresponds to the “cooling pump” described in the means for solving the problem.

  The second cooling channel 126 is connected to both ends of the first cooling channel 120. The second cooling flow path 126 includes a radiator 110 for cooling the cooling water and a temperature sensor 134. The ECU 30 controls the temperature of the cooling water flowing through the second cooling flow path 126 by controlling the operation of the fan 112 based on the measurement value of the temperature sensor 134.

  The third cooling channel 128 is a bypass channel for allowing the cooling water flowing through the outlet side channel 124 to flow into the inlet side channel 122 without passing through the second cooling channel 126.

  The air conditioning circuit 20 includes a first air conditioning channel 210 and a second air conditioning channel 214 connected to both ends of the first air conditioning channel 210. The first air conditioning flow path 210 and the second air conditioning flow path 214 can form a cooling water circulation flow path.

  The first air conditioning channel 210 includes an electric heater 202, a heater core 200 as a heat exchanger, a water pump WP2 (hereinafter also referred to as “air conditioning pump WP2”), and two temperature sensors 230 and 232. It is arranged. The first air conditioning channel 210 has an inlet side air conditioning channel 212 through which the cooling water flowing into the heater core 200 flows, and an outlet side air conditioning channel 213 through which the cooling water flowing through the heater core 200 flows out. The air conditioning pump WP2 has a maximum flow rate of 10 L / min. The temperature sensor 230 measures the temperature of the cooling water before passing through the heater core 200 (also referred to as “heater core inlet water temperature”). The temperature sensor 232 measures the temperature of the cooling water after passing through the heater core 200 (also referred to as “heater core outlet water temperature”). Here, the electric heater 202 and the heater core 200 correspond to the “heat source” described in the means for solving the problem.

  In the air conditioning system 1, the cooling water in the cooling circuit 10 flows into the air conditioning circuit 20 through the two communication channels 216 and 218, and the flowing cooling water flows through the air conditioning circuit 20 and then flows into the cooling circuit 10 again. It is possible. That is, the air conditioning system 1 has a connected state in which cooling water flows between the cooling circuit 10 and the air conditioning circuit 20 and a non-connected state in which cooling water does not flow between the cooling circuit 10 and the air conditioning circuit 20. The switching between the two states is to switch the opening and closing of the valve V3 provided at the connection point of the first communication channel 216, the first air conditioning channel 210, and the second air conditioning channel 214. Done in Here, the valve V3 corresponds to the “switching unit” described in the means for solving the problem.

  The heater core 200 is installed in the ventilation duct 24 and heats air blown from the blower 220 as a blower installed on the upstream side of the ventilation duct 24. Specifically, heat exchange is performed between the cooling water flowing inside the heater core 200 and the air blown from the blower 220 toward the heater core 200. The heat-exchanged air is sent from the ventilation duct 24 to the vehicle interior 40 that is inside the moving body. A temperature sensor (not shown) that measures the temperature of the air blown to the heater core 200 is disposed upstream of the heater core 200 in the ventilation duct 24.

  The ECU 30 determines the rotational speed (also referred to as “rotational speed”) of the air conditioning pump WP2 and the rotational speed of the blower 220 according to the target vehicle interior temperature, the current vehicle interior temperature, the current vehicle exterior temperature, and the like set by the user. (Also referred to as “rotational speed”) is controlled to adjust the heat dissipation amount of the heater core 200. That is, the ECU 30 executes the operation of the air conditioning system 1 in response to a heating request on the air conditioning side.

  A temperature setting device 401 is disposed in the vehicle interior 40, and the user sets a target vehicle interior temperature in the temperature setting device 401. Further, the temperature setting device 401 is provided with a heating switch (not shown) for enabling a heating mode for heating the vehicle interior 40. When the heating switch is turned on by the user, the ECU 30 starts from the temperature setting device 401. The air conditioning request is received, and the heating operation using the air conditioning circuit 20 is performed. Moreover, the vehicle interior temperature set by the user using the temperature setting device 401 is sent to the ECU 30 as an output signal and used for controlling various actuators during the heating operation.

  The electric heater 202 is used to heat the cooling water flowing into the heater core 200 when the amount of heat of the cooling water exchanged by the heater core 200 is insufficient. For example, when the air conditioning system 1 is in a disconnected state, the waste heat of the fuel cell stack 100 cannot be used, so the cooling water flowing into the heater core 200 is heated in response to a heating request.

  The temperature sensor 230 measures the temperature of the cooling water flowing into the heater core 200. The temperature sensor 232 measures the temperature of the cooling water that has passed through the heater core 200. The temperatures measured by the two temperature sensors 230 and 232 are transmitted to the ECU 30 as output signals and used for controlling the air conditioning system 1.

  The ECU 30 mainly includes a CPU 310, a memory 320, and an input / output port 330. The input / output port 330 connects various actuators and various sensors to the ECU 30 via a control signal line. Here, examples of the various actuators include a fan 112, water pumps WP1 and WP2, an electric heater 202, a blower 220, and valves V1 and V3. Examples of various sensors include temperature sensors 130, 132, 134, 230, and 232 and a temperature setting device 401.

  Various programs executed by the CPU 310 are recorded in the memory 320. The CPU 310 controls the operation of the air conditioning system 1 using various programs recorded in the memory 320. For example, the CPU 310 uses various programs recorded in the memory 320 to rotate the rotational speeds of the FC pump WP1 and the air conditioning pump WP2, the heat amounts (heat generation amount and heat release amount) of the electric heater 202 and the heater core 200, and the opening and closing of the valve V3. To control. Further, the CPU 310 determines whether the pump WP1 is idle. Details of the idling determination method will be described later.

A-2. Air conditioning system flow at the start of air conditioning drive:
FIG. 2 is a flowchart showing the operation of the air conditioning system 1 at the start of air conditioning driving. During activation of the air conditioning system 1, the ECU 30 monitors the presence or absence of an air conditioning request from the temperature setting device 401. When there is no air conditioning request from the temperature setting device 401, the presence / absence of the air conditioning request is continuously monitored. On the other hand, when the heating switch of the temperature setting device 401 is turned on, the ECU 30 receives an air conditioning request from the temperature setting device 401 (step S12: YES), and the CPU 310 executes an initial air bleeding operation (step S14). After execution of the initial air bleeding operation, various actuators of the air conditioning circuit 20 are driven to send warm air to the vehicle interior 40 (step S16).

  FIG. 3 is a flowchart for explaining the initial air bleeding operation. When executing the initial air bleeding operation, the CPU 310 determines whether or not the air conditioning system 1 is in a connected state (step S140). When the air conditioning system 1 is in the connected state (step S140: YES), the CPU 310 drives the air conditioning pump WP and drives the FC pump WP1 at a predetermined rotation speed or higher for a predetermined time (step S142). By doing so, the liquid is forcibly fed to the air conditioning circuit 20 by the FC pump WP1, and the air venting of the air conditioning pump WP2 is executed. In order to forcibly supply more cooling water to the air conditioning circuit 20 by the FC pump WP1, from the point where the first communication channel 216 is connected in the outlet side channel 124 (FIG. 1). Alternatively, a variable resistance mechanism that can vary the flow path resistance of the outlet side flow path 124 may be provided on the downstream side. That is, when step S142 is executed, a large amount of cooling water is sent from the cooling circuit 10 to the air conditioning circuit 20 by controlling the resistance variable mechanism and increasing the flow path resistance of the outlet side flow path 124. Here, as the resistance variable mechanism, for example, a valve such as a gate valve can be used.

  Step S142 will be further described in detail. During normal power generation of the fuel cell stack 100, the rotation speed of the FC pump WP1 is controlled according to the amount of heat generated by the fuel cell stack 100. However, in step S142, regardless of the power generation state of the fuel cell stack 100, the FC pump WP1 is driven at a predetermined rotational speed or higher for a predetermined time. For example, step S142 is executed even when the fuel cell stack 100 is not generating power, or when the power generation amount of the fuel cell stack 100 is small and the temperature of the fuel cell stack 100 is low (for example, 50 ° C. or less). Here, the predetermined time for driving the FC pump WP1 in step S142 is the time from when the FC pump WP1 is driven at a predetermined rotation speed or higher until the cooling water fed at the rotation speed reaches the air conditioning pump WP2. Set the above. In this embodiment, the predetermined time is set to 10 seconds.

  The predetermined rotation speed of the FC pump WP1 driven in step S142 is such that a flow rate that allows the air mixed in the air conditioning pump WP2 to be discharged by sending the liquid from the cooling circuit 10 to the air conditioning circuit 20 is sent to the air conditioning pump WP2. Set to allow liquid. For example, the FC pump WP1 is driven at a rotational speed that is higher than the rotational speed at which a flow rate greater than the maximum capacity of the air conditioning pump WP2 can be fed. Preferably, the FC pump WP1 is driven at a rotational speed equal to or higher than the rotational speed at which the flow rate is twice or more the maximum capacity of the air conditioning pump WP2. By doing so, a large amount of cooling water forcibly flows into the first air-conditioning flow path 210 from the outlet-side flow path 124, so that the air-conditioning pump WP2 can be vented more reliably. In step S142, the rotation speed of the air conditioning pump WP2 is not particularly limited, but it is preferable to drive at a rotation speed at which the maximum capacity can be fed. Thereby, air bleeding can be performed more reliably.

  On the other hand, when the air conditioning system 1 is in the disconnected state (step S140: NO), the CPU 310 controls the opening and closing of the valve V3 (FIG. 1) to switch the air conditioning system 1 from the disconnected state to the connected state (step S144). ). Thereafter, as in step S142, the CPU 310 drives the air conditioning pump WP and drives the FC pump WP1 at a predetermined rotational speed or higher for a predetermined time (step S146). After execution of step S146, the CPU 310 controls the opening and closing of the valve V3 to switch the air conditioning system 1 from the connected state to the disconnected state (step S148), and the initial air bleeding operation is finished.

  When driving of the air conditioning pump WP2 is started in response to an air conditioning request, air staying in the air conditioning circuit 20 may enter the air conditioning pump and idle rotation may occur. However, in the above flow, when the air conditioning pump WP2 is driven in response to an air conditioning request, an initial air bleeding operation is executed. Therefore, it is possible to reduce the idling of the air conditioning pump WP2 after the driving of the air conditioning pump WP2 is started. Further, since the air venting operation is executed by using the FC pump WP1 arranged in the cooling circuit 10 of the air conditioning system 1, it is not necessary to separately provide a device for air venting, and the cost of the air conditioning system 1 can be reduced. The air bleeding operation can be easily executed while reducing the amount.

A-3. Air conditioning system flow during air conditioning operation:
FIG. 4 is a flowchart showing the operation of the air conditioning system 1 during air conditioning driving. The operation of the air conditioning system 1 that is driving the air conditioning will be described with reference to FIG. That is, FIG. 4 is a flowchart for explaining the operation of the air conditioning system 1 after steps S12 to S16 of FIG. 2 are executed.

  After driving the air conditioning, the CPU 310 executes idling determination every predetermined time, and determines whether or not the cooling water according to the rotation speed of the air conditioning pump WP2 is flowing into the air conditioning circuit 20 (step S18). CPU310 performs step S18 again after predetermined time, when it detects that the flow volume according to the rotation speed of the air conditioning pump WP2 is flowing into the air-conditioning circuit 20 (step S18: YES). Note that the idling determination is performed using any of a plurality of determination modes described later.

  On the other hand, when CPU 310 detects that the flow rate according to the rotation speed of air conditioning pump WP2 does not flow into air conditioning circuit 20 (step S18: NO), CPU 310 stops the heating operation by electric heater 202 (step S19). Thereby, the cooling water of the air conditioning circuit 20 can be prevented from being locally heated and evaporated, and the generation of air in the air conditioning circuit 20 can be reduced.

  After stopping the heating operation, the CPU 310 performs an air bleeding operation (step S20). Note that the air bleeding operation executed in step S20 is performed in the same manner as the initial air bleeding operation (FIG. 3).

  After executing the air bleeding operation, the CPU 310 resumes the heating operation by the electric heater 202 in response to the air conditioning request (step S21). Next, the idling determination is performed again without a predetermined time interval (that is, immediately after step S21), and it is determined whether or not the flow rate according to the rotation speed of the air conditioning pump WP2 is flowing into the air conditioning circuit 20. (Step S22). This is to confirm whether or not the air conditioning pump WP2 has functioned normally by executing the air bleeding operation in step S20. Note that the details of the idling determination performed in step S22 are the same as the idling determination performed in step S18, and details will be described later.

  In step S22, the idling determination is performed again, and when it is detected that the refrigerant is not flowing through the air conditioning circuit 20 at a flow rate according to the rotation speed of the air conditioning pump WP2 (step S22: NO), the CPU 310 makes an air conditioning request. Regardless, the rotation of the air conditioning pump WP2 is stopped and the air conditioning operation is stopped (step S24). This is because the CPU 310 determines that the air conditioning pump WP2 is not functioning normally for reasons other than idling due to air biting.

  On the other hand, if the idling determination is executed again in step S22 and it is detected that the refrigerant is flowing through the air conditioning circuit 20 at a flow rate corresponding to the rotation speed of the air conditioning pump WP2 (step S22: YES), the air conditioning request is met. The air conditioning operation is continued (step S26).

  As described above, when it is determined that idling occurs, the air conditioning system 1 performs the air bleeding operation by using the FC pump WP1 of the cooling circuit 10. Thereby, it is not necessary to separately provide a device for removing air, and the cost of the air conditioning system 1 can be reduced. Below, the aspect of the idling determination which the air conditioning system 1 of a present Example performs is demonstrated.

A-3-1. Operation flow for idling determination of the first aspect:
FIG. 5 is a flowchart of the idling determination of the first aspect. CPU 310 calculates an inlet / outlet temperature difference ΔTa1 (hereinafter also referred to as “measured temperature difference ΔTa1”) of cooling water heater core 200 based on the measured values of temperature sensors 230 and 232 (FIG. 1) (step S180). Further, the CPU 310 calculates the heat dissipation amount of the heater core 200 based on the data related to the air temperature to the heater core 200 and the airflow amount to the heater core 200 and the data related to the performance of the known heater core 200. Then, based on the calculated heat dissipation amount and the rotation speed of the air conditioning pump WP2, a temperature difference ΔTb1 at the entrance / exit of the heater core 200 for the cooling water is calculated (step S182). This entrance / exit temperature difference ΔTb1 is hereinafter also referred to as “estimated temperature difference ΔTb1”. Specifically, the estimated temperature difference ΔTb1 is calculated using the following equation (1).
Q = C × m × ΔTb1 (1)
Here, Q is the heat dissipation amount (kW) of the heater core, C is the specific heat (kJ / g · ° C.) of the cooling water flowing through the air conditioning circuit 20, and m is the cooling flowing through the air conditioning circuit 20 calculated based on the rotation speed of the air conditioning pump WP2. The flow rate of water (kg / s). Note that the order of step S180 and step S182 is not limited to this, and step S182 may be executed first.

  After calculating the measured temperature difference ΔTa1 and the estimated temperature difference ΔTb1, the CPU 310 determines whether or not the difference between the estimated temperature difference ΔTb1 and the measured temperature difference ΔTa1 is greater than a predetermined threshold SV (step S184).

  When the difference between the estimated temperature difference ΔTb1 and the measured temperature difference ΔTa1 is larger than the predetermined threshold value SV (step S184: YES), the cooling water having a predetermined flow rate (flow rate corresponding to the rotation speed of the air conditioning pump WP2) is increased. Since it does not flow into the air conditioning circuit 20, the CPU 310 determines that the air conditioner pump WP2 is idle (step S186).

  On the other hand, when the difference between the estimated temperature difference ΔTb1 and the measured temperature difference ΔTa1 is equal to or smaller than the predetermined threshold SV (step S184: NO), the air flow is supplied to the air conditioning circuit 20 at a predetermined flow rate (the flow rate according to the rotation speed of the air conditioning pump WP2). CPU 310 determines that no idle rotation has occurred in the air conditioning pump WP2 (step S186). That is, when cooling water having a predetermined flow rate corresponding to the rotation speed of the air conditioning pump WP2 flows through the air conditioning circuit 20, there is almost no difference between the estimated temperature difference ΔTb1 and the measured temperature difference ΔTa1. In other words, when the difference between the estimated temperature difference ΔTb1 and the measured temperature difference ΔTa1 is large, the cooling water having a predetermined flow rate does not flow through the air conditioning circuit 20 even though the air conditioning pump WP2 is rotated. become. As a result, when CPU 310 detects that cooling water is flowing, it determines that idling of air conditioning pump WP2 has not occurred, and when it has detected that cooling water is not flowing, CPU 310 has idling of air conditioning pump WP2. Can be determined to have occurred. In order to accurately perform the idling determination, it is preferable to set the predetermined threshold SV to 10 ° C. or less. In this embodiment, the predetermined threshold SV is set to 5 ° C.

  As described above, whether the idling determination of the first mode executed by the air conditioning system 1 during the air conditioning operation is based on the measured temperature difference ΔTa1 and the estimated temperature difference ΔTb1 is a predetermined flow rate of cooling water flowing through the air conditioning circuit 20? By detecting whether or not, the occurrence of idling of the air conditioning pump WP2 can be easily determined.

A-3-2. Operation flow of the idling determination of the second aspect:
FIG. 6 is a flowchart of the idling determination in the second mode. When performing the idling determination, CPU 310 changes the rotational speed of air conditioning pump WP2 by a predetermined amount regardless of the air conditioning request (step S190). Next, based on the measured values of the temperature sensors 230 and 232 (FIG. 1), the CPU 310 changes the entrance / exit temperature difference ΔTc1 of the heater core 200 before changing the rotational speed and the entrance / exit of the heater core 200 after changing the rotational speed. A difference ΔTc3 (hereinafter also referred to as “measurement change value ΔTc3”) with respect to the temperature difference ΔTc2 is calculated (step S192). Details of steps S190 and S192 will be described below with reference to FIG.

  FIG. 7 is a diagram for explaining steps S190 and S192. FIG. 7A is a diagram showing a change over time in the rotational speed of the air conditioning pump WP2, and FIG. 7B is a diagram showing a change over time in the entrance / exit temperature of the heater core 200. FIG. When performing the idling determination in the second mode, the CPU 310 changes the rotation speed of the air conditioning pump WP2 from the rotation speed R2 to the rotation speed R1 that is 1/2 of the rotation speed at a predetermined time t1. Further, the CPU 310 changes the entrance / exit temperature difference ΔTc1 of the heater core 200 before the rotational speed change based on the measured values of the temperature sensors 230 and 232, and the heater core 200 at the time t2 after a predetermined time has elapsed after changing the rotational speed. The difference (hereinafter also referred to as “measurement change value”) ΔTc3 with the inlet / outlet temperature difference ΔTc2 is calculated. In addition, after the time t2, the rotation speed of the air conditioning pump WP2 is controlled according to the air conditioning request.

  Returning to FIG. 6, the idling determination of the second mode will be further described. The CPU 310 calculates an estimated temperature difference ΔTd1 before the change in the rotation speed of the air conditioning pump WP2 and an estimated temperature difference ΔTd2 after the change based on the rotation speed of the air conditioning pump WP2 and the heat dissipation amount of the heater core 200. Then, a difference (hereinafter also referred to as “estimated change value”) ΔTd3 between the estimated temperature difference ΔTd1 and the estimated temperature difference ΔTd2 is calculated (step S194). Note that the order of step S192 and step S194 is not limited to this, and step S194 may be executed first.

  Next, the CPU 310 determines whether or not the difference between the estimated change value ΔTd3 and the measured change value ΔTc3 is larger than a predetermined threshold value SV (step S196). If the difference between the estimated change value ΔTd3 and the measured change value Tc3 is larger than the predetermined threshold value SV (step S196: YES), the CPU 310 determines that the air conditioning circuit 20 does not flow with a predetermined flow rate. It is determined that idling occurs in the pump WP2 (step S198).

  On the other hand, when the difference between the estimated change value ΔTd3 and the measured change value Tc3 is equal to or smaller than the predetermined threshold value SV (step S196: NO), the CPU 310 determines that the predetermined flow rate of cooling water flows through the air conditioning circuit 20. It is determined that no idle rotation has occurred in the air conditioning pump WP2 (step S200). Note that the predetermined threshold SV is preferably set to 10 ° C. or lower as in the first embodiment, and in this embodiment, the predetermined threshold SV is set to 5 ° C.

  As described above, whether the idling determination in the second mode executed by the air conditioning system 1 during the air conditioning operation is based on the measured change value ΔTc3 and the estimated change value ΔTd3, is a predetermined flow rate of cooling water flowing in the air conditioning circuit 20? Therefore, it is possible to reduce erroneous determination of idling due to measurement error of the temperature sensor. Thereby, compared with the idling determination of the first aspect, the idling determination can be performed with high accuracy. In addition, by changing the rotation speed of the air conditioning pump WP2 stepwise, the measured temperature difference ΔTc2 after the change can be acquired more quickly than when the rotation speed is changed slowly. It can be executed in a short time.

A-4. Air conditioning system flow at the start of consolidation:
FIG. 8 is a flowchart showing the operation of the air conditioning system 1 at the start of connection. This flow is an operation flow in the case where the air conditioning is driven while the air conditioning system 1 is in a disconnected state. The CPU 310 determines whether the air conditioning system 1 can be switched from the unconnected state to the connected state. Specifically, when the temperature of the cooling water flowing out from the fuel cell stack 100 measured by the temperature sensor 132 (FIG. 1) (hereinafter also referred to as “FC outlet water temperature”) is equal to or higher than a predetermined value, it is determined that switching is possible. To do. Here, the predetermined value of the FC outlet water temperature can be set in the range of the minimum temperature (for example, 50 ° C. or higher) at which the cooling water flowing out from the fuel cell stack 100 can be effectively used as the heat source of the air conditioning circuit 20. The predetermined value is set to 60 ° C.

  When CPU 310 determines that it cannot be switched to the connected state (step S30: NO), it repeatedly executes step S30. On the other hand, when CPU 310 determines that it can be switched to the connected state (step S30: YES), it drives FC pump WP1 at a predetermined speed or higher for a predetermined time regardless of the power generation state of fuel cell stack 100 (step S32). By doing so, the liquid can be forcibly sent to the air conditioning circuit 20 by the FC pump WP1, and the air of the air conditioning pump WP2 can be removed. The predetermined rotation speed of the FC pump WP1 driven in step S32 and the driving time at the predetermined rotation speed are the same as those in steps S142 and S146 (FIG. 3) of the initial air bleeding operation. In addition, during the execution of step S32, it is preferable to drive the air conditioning pump WP2 at the maximum capacity rotation speed in order to perform air bleeding more reliably.

  After step S32, the CPU 310 switches between opening and closing the valve V3 (FIG. 1) to switch the air conditioning system 1 from the unconnected state to the connected state (step S34).

  When the air conditioning system 1 is switched from the unconnected state to the connected state, air in the cooling circuit 10 may enter the air conditioning pump WP2 and idle rotation may occur. However, in the above flow, when switching from the non-connected state to the connected state, the air vent of the air conditioning pump WP2 is executed using the FC pump WP1. Therefore, it is possible to reduce the idling of the air conditioning pump WP2 after switching from the non-connected state to the connected state.

B. Variations:
In addition, elements other than the elements described in the independent claims of the claims in the constituent elements in the above-described embodiments are additional elements and can be omitted as appropriate. Further, the present invention is not limited to the above-described examples and embodiments, and can be implemented in various forms without departing from the gist thereof. For example, the following modifications are possible.

B-1. First modification:
In the idling determination (FIG. 5) of the first aspect of the embodiment, the idling determination is executed using the temperature of the cooling water before and after the heater core 200. However, the idling determination is not limited to this and is arranged in the air conditioning circuit 20. The idling determination of the first aspect can be executed using the cooling water temperatures before and after the various heat sources. For example, the idling determination may be executed based on the measured temperature difference and the estimated temperature difference at the entrance / exit of the electric heater 202 instead of the heater core 200. Even in this case, it is possible to easily determine the occurrence of idling of the air conditioning pump WP2 by using the electric heater 202 arranged in the air conditioning circuit 20.

B-2. Second modification:
FIG. 9 is a flowchart of idling determination in the second modification. The difference from the idling determination (FIG. 6) of the second aspect of the embodiment is that the amount of heat generated by the electric heater 202 is changed instead of changing the rotation speed of the air conditioning pump WP. Since the configuration of the air conditioning system 1 is the same as that of the embodiment (FIG. 1), description thereof is omitted.

  The CPU 310 changes the heat generation amount of the electric heater 202 by a predetermined amount regardless of the air conditioning request (step S190a). For example, the heat generation amount is changed twice in a stepped manner. Next, based on the measured values of the temperature sensors 132 and 230 (FIG. 1), the CPU 310 changes the entrance / exit temperature difference ΔTe1 of the electric heater 202 before changing the calorific value and the electric heater 202 after changing the calorific value. A difference ΔTe3 (hereinafter also referred to as “measurement change value ΔTe3”) with respect to the inlet / outlet temperature difference ΔTe2 is calculated (step S192a). Note that after calculating the measured change value ΔTe3, the amount of heat generated by the electric heater 202 is changed according to the air conditioning request.

  Further, the CPU 310 calculates an estimated temperature difference ΔTf1 before the change in the rotation speed of the air conditioning pump WP2 and an estimated temperature difference ΔTf2 after the change based on the rotation speed of the air conditioning pump WP2 and the heat generation amount of the electric heater 202, A difference (hereinafter also referred to as “estimated change value”) ΔTf3 between the estimated temperature difference ΔTf1 and the estimated temperature difference ΔTf2 is calculated (step S194a). Note that the order of step S192a and step S194a is not limited to this, and step S194a may be executed first.

  Next, the CPU 310 determines whether or not the difference between the estimated change value ΔTf3 and the measured change value ΔTe3 is larger than a predetermined threshold value SV (step S196a). When the difference between the estimated change value ΔTf3 and the measured change value ΔTe3 is larger than the predetermined threshold value SV (step S196a: YES), the CPU 310 is idled as in the idling determination (FIG. 6) of the second mode. (Step S198a). On the other hand, when the difference between the estimated change value ΔTf3 and the measured change value ΔTe3 is equal to or smaller than the predetermined threshold value SV (step S196a: NO), the CPU 310 performs the same as in the second mode idling determination (FIG. 6). It is determined that no idle rotation has occurred (step S200a).

  In this way, it is possible to easily determine whether the air-conditioning pump WP2 is idling by changing the amount of heat generated by the electric heater 202 as a heat source. Further, similarly to the idling determination in the second mode, it is possible to reduce the misjudgment in idling determination due to the measurement error of the temperature sensor.

B-3. Third modification:
In the idling determination (FIG. 6) of the second aspect of the above embodiment, the idling determination is performed based on the measured change value ΔTc3 and the estimated change value ΔTd3, which is the difference in the inlet / outlet temperature of the heater core 200, by changing the rotation speed of the air conditioning pump WP2. However, the present invention is not particularly limited to this. For example, the amount of heat (heat radiation amount or heat generation amount) of any one of the electric heater 202 and the heater core 200 arranged in the air conditioning circuit 20 is changed by a predetermined amount, and the electric heater 202 inlet (front stage) and the heater core 200 outlet (rear stage) The idling determination may be performed based on the difference between the estimated change value and the measured change value. That is, the amount of heat (radiation amount or heat generation amount) of one of the heat sources arranged in the air conditioning circuit 20 is changed regardless of the air conditioning request, and the measured change values of the cooling water located in the front stage and the cooling water located in the rear stage of the heat source are It may be determined whether the difference from the estimated change value is greater than a predetermined threshold value SV. Even in this case, the idling determination can be accurately performed as in the idling determination of the second mode.

B-4. Fourth modification:
In the above embodiment, the FC pump WP1 has a capacity of a maximum flow rate of 150 L / min, and the air conditioning pump WP2 has a capacity of a maximum flow rate of 10 L / min, but is not particularly limited thereto. The air bleeding operation of the present invention can be applied to the air conditioning system 1 in which the maximum flow rate of the FC pump WP1 is greater than or equal to the maximum flow rate of the air conditioning pump WP2. Preferably, the maximum flow rate of the FC pump WP2 is preferably at least twice the maximum flow rate of the air conditioning pump WP2, more preferably 10 times or more. By doing so, the air mixed in the air conditioning pump WP2 can be surely extracted using the FC pump WP1.

B-5. Fifth modification:
In the said Example, although demonstrated taking the case where the air conditioning system 1 was mounted in a vehicle as an example, this invention is applicable to the air conditioning system 1 mounted in various moving bodies. For example, the air conditioning system 1 according to the present invention can be applied to various moving bodies such as trains, ships, and aircraft. Furthermore, the air conditioning system 1 of the present invention can be applied not only to a moving body but also to a system that uses the waste heat of the fuel cell stack 100 as a heat source for air conditioning in a house.

B-6. Sixth modification:
In the above embodiment, the ECU 30 is used to control both the cooling circuit 10 having the fuel cell stack 100 and the air conditioning circuit 20 used for blowing air to the vehicle interior 40. However, the ECU 30 is used to control the cooling circuit 10. And an ECU for controlling the air conditioning circuit 20 may be provided. In this case, necessary information (such as measured values of the temperature sensor 132) is communicated between the ECUs.

B-7. Seventh modification:
In the above embodiment, the waste heat of the fuel cell stack 100, the electric heater 202, and the heater core 200 can be used as the heating heat source. However, the heat source that can be used as the heating heat source is not particularly limited thereto. . For example, a heat exchanger such as a heat pump or an air heater may be provided in the ventilation duct 24.

B-8. Eighth modification:
In the above embodiment, the cooling water is used as the refrigerant. However, the present invention is not particularly limited to this, and various liquids can be used as the refrigerant. For example, an antifreeze solution in which ethylene glycol or the like is added to water may be used as the refrigerant.

B-9. Ninth modification:
In the above embodiment, the polymer electrolyte fuel cell is used as the fuel cell stack 100. However, various fuel cells such as a phosphoric acid fuel cell, a molten carbonate fuel cell, and a solid oxide fuel cell may be used. it can.

DESCRIPTION OF SYMBOLS 1 ... Air conditioning system 10 ... Cooling circuit 20 ... Air conditioning circuit 24 ... Ventilation duct 30 ... ECU
DESCRIPTION OF SYMBOLS 40 ... Car interior 100 ... Fuel cell stack 110 ... Radiator 112 ... Fan 120 ... 1st cooling flow path 122 ... Inlet side flow path 124 ... Outlet side flow path 126 ... 2nd cooling flow path 128 ... 3rd cooling flow Path 130 ... Temperature sensor 132 ... Temperature sensor 134 ... Temperature sensor 200 ... Heater core 202 ... Electric heater 210 ... First air conditioning channel 212 ... Inlet side air conditioning channel 213 ... Outlet side air conditioning channel 214 ... Second air conditioning Flow path 216 ... First communication flow path 218 ... Second communication flow path 220 ... Blower 230 ... Temperature sensor 232 ... Temperature sensor 310 ... CPU
320 ... Memory 330 ... I / O port 401 ... Temperature setter V1 ... Valve V3 ... Valve WP1 ... FC pump WP2 ... Air conditioning pump

Claims (10)

An air conditioning system,
A cooling circuit having a cooling pump for circulating the refrigerant, the cooling circuit for cooling the fuel cell;
An air-conditioning circuit having an air-conditioning pump for circulating the refrigerant, wherein an air-conditioning circuit in which a heat source used for adjusting the temperature of air blown into the room is disposed;
A switching unit capable of switching between a connected state in which refrigerant flows between the cooling circuit and the air conditioning circuit and a non-connected state in which refrigerant does not flow between the cooling circuit and the air conditioning circuit;
A control unit for controlling the air conditioning system,
The controller is
When it is determined that idling occurs in the air-conditioning pump, or when a predetermined condition that may cause idling is satisfied, the air-conditioning pump is driven in the connected state, regardless of the power generation state of the fuel cell. An air conditioning system in which the cooling pump is driven at a rotational speed equal to or higher than a predetermined value. The air conditioning system according to claim 1,
The predetermined condition includes an air conditioning system including, as a part of the condition, that the control unit receives an air conditioning request for blowing air into the room and starts driving the air conditioning pump. The air conditioning system according to claim 1,
The predetermined condition includes an air conditioning system including, as a part of the condition, the control unit switching from the unconnected state to the connected state. The air conditioning system according to claim 1,
A first temperature sensor for measuring a temperature of a preceding refrigerant that is the refrigerant before passing through the heat source;
A second temperature sensor for measuring a temperature of a rear-stage refrigerant that is the refrigerant after passing through the heat source,
The controller is
Based on the measured values of the first and second temperature sensors, calculate a measured temperature difference that is a temperature difference between the preceding refrigerant and the latter refrigerant;
Based on the amount of heat of the heat source and the rotation speed of the air conditioning pump, an estimated temperature difference that is a temperature difference between the front-stage refrigerant and the rear-stage refrigerant is calculated,
An air conditioning system that determines whether or not idling occurs in the air conditioning pump based on the measured temperature difference and the estimated temperature difference. An air-conditioning determination system for an air-conditioning pump that is arranged in an air-conditioning circuit and circulates refrigerant through the air-conditioning circuit,
A heat source used for adjusting the temperature of air blown into the room, the heat source disposed in the air conditioning circuit;
A first temperature sensor for measuring a temperature of a preceding refrigerant that is the refrigerant before passing through the heat source;
A second temperature sensor for measuring a temperature of a rear refrigerant that is the refrigerant after passing through the heat source;
A control unit for controlling the idling determination system,
The controller is
Based on the measured values of the first and second temperature sensors, calculate a measured temperature difference that is a temperature difference between the preceding refrigerant and the latter refrigerant;
Based on the amount of heat of the heat source and the rotation speed of the air conditioning pump, an estimated temperature difference that is a temperature difference between the front-stage refrigerant and the rear-stage refrigerant is calculated,
An idling determination system that determines whether idling occurs in the air-conditioning pump based on the measured temperature difference and the estimated temperature difference. The idling determination system according to claim 5,
The controller is
If the difference between the measured temperature difference and the estimated temperature difference is greater than a predetermined threshold, it is determined that the air-conditioning pump is idle.
An idling determination system that determines that idling has not occurred in the air conditioning pump when a difference between the measured temperature difference and the estimated temperature difference is equal to or less than a predetermined threshold. The idling determination system according to claim 5,
The controller is
Change the rotation speed of the air conditioning pump,
Calculating a measurement change value that is a difference between the measurement temperature difference before the change and the measurement temperature difference after the change;
Calculating an estimated change value which is a difference between the estimated temperature difference before the change and the estimated temperature difference after the change;
When the difference between the measured change value and the estimated change value is greater than a predetermined threshold, it is determined that the air conditioner is idling.
An idling determination system that determines that idling has not occurred in the air conditioning pump when a difference between the measured change value and the estimated variation value is equal to or less than a predetermined threshold value. The idling determination system according to claim 5,
The controller is
Changing the amount of heat of the heat source,
Calculating a measurement change value that is a difference between the measurement temperature difference before the change and the measurement temperature difference after the change;
Calculating an estimated change value which is a difference between the estimated temperature difference before the change and the estimated temperature difference after the change;
If the difference between the measured change value and the estimated change value is greater than a predetermined value, it is determined that the air-conditioning pump is idle.
An idling determination system that determines that idling has not occurred in the air conditioning pump when a difference between the measured change value and the estimated variation value is equal to or less than a predetermined threshold value. The idling determination system according to any one of claims 5 to 8,
When the heat source has a heating device that heats the refrigerant flowing through the air conditioning circuit,
The control unit is an idling determination system that stops heating of the refrigerant by the heating device when it is determined that idling occurs in the air-conditioning pump. An air conditioning system comprising the idling determination system according to any one of claims 5 to 9,
A cooling circuit having a cooling pump for circulating the refrigerant, the cooling circuit for cooling the fuel cell;
A switching unit capable of switching between a connected state in which refrigerant flows between the cooling circuit and the air conditioning circuit and a non-connected state in which refrigerant does not flow between the cooling circuit and the air conditioning circuit;
An air conditioning control unit for controlling the air conditioning system,
When the idling determination system determines that idling has occurred in the air conditioning pump, the air conditioning control unit drives the cooling pump at a rotational speed equal to or higher than a predetermined value in the connected state regardless of the power generation state of the fuel cell. Let the air conditioning system.

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