JP2008207569A - Cooling system for fuel cell mounting vehicle, and cooling controlling method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling system for a fuel cell mounting vehicle capable of suitably carrying out cooling according to a driving state of a vehicle. <P>SOLUTION: In the vehicular cooling system 10, an air conditioner radiator 42 on an upstream side of vehicle speed wind, and a fuel cell radiator 62 on a downstream side are disposed so as to be superimposed with each other in a flow passage of the vehicle speed wind. A controlling computer 80 of the cooling system 10 judges whether the temperature of a fuel cell stack 32 is not less than a predetermined value or not. As a result of that, if not less than the predetermined value TH, as a radiator mounting variable control, an installation position of a heat exchanger unit 42a constituting the air conditioner radiator 42 or installation positions of the heat exchanger unit 42a and a heat exchanger unit 42b are moved toward an upper surface direction, thereby increasing the vehicle speed wind led to the fuel cell radiator 62 without raising temperature by the air conditioner radiator 42 and lowering wind speed. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a cooling technology for a vehicle equipped with a fuel cell, and more particularly to cooling control of a cooling system including a plurality of heat exchangers.

  In vehicles equipped with fuel cells, the refrigerant is circulated in the fuel cell stack to absorb the heat generated by the fuel cell reaction, and the heat is dissipated by the radiator for the fuel cell, thereby ensuring the proper operating temperature of the fuel cell. The Such a vehicle equipped with a fuel cell is provided with an EV radiator for cooling drive system equipment other than the fuel cell, an air conditioner radiator, and the like in addition to the fuel cell radiator. These radiators are generally configured as a fuel cell-equipped vehicle cooling system, and cool the refrigerant passing through the radiator by exchanging heat with cooling air generated by a vehicle running or a cooling fan.

  In such a fuel cell-equipped vehicle, the amount of heat released by the exhaust gas is extremely small compared to a vehicle using an internal combustion engine as a power source, so that the load on the fuel cell radiator is increased. Therefore, the arrangement of the above-described radiator group is considered so that efficient heat exchange is possible with the radiator for the fuel cell. As a fuel cell-equipped vehicle for which such arrangement has been studied, for example, a technique described in Patent Document 1 below is known.

JP 2006-216398 A

  In Patent Document 1, a high-temperature portion of an air conditioner radiator disposed on the upstream side of cooling air flowing from the front of the vehicle is overlapped with a fuel cell radiator disposed on the downstream side as viewed from the front of the vehicle. In order to avoid this, the radiator for the air conditioner and the radiator for the fuel cell are partially offset from each other. As a result, the downstream fuel cell radiator is not affected by the high temperature portion of the air conditioning radiator on the cooling air upstream side, and a decrease in cooling efficiency can be suppressed.

  However, in such an arrangement of the radiator, if the overlapping portion of the air conditioner radiator and the fuel cell radiator is made large (the offset portion is made small), due to the influence of the upstream air conditioner radiator, the fuel cell for the downstream side The cooling wind that hits the radiator increases in temperature and the wind speed decreases, and depending on the operating conditions, there may be cases where sufficient cooling efficiency cannot be obtained. On the other hand, if the above-described overlapping portion is made small (the offset portion is made large), the radiator areas of each other become small due to space constraints, and similarly, there may be cases where sufficient cooling efficiency cannot be obtained depending on the operating conditions. There was a thing.

  Such a problem is not limited to a problem between an air conditioner radiator and a fuel cell radiator, but is a problem common to a cooling system including a plurality of radiators. In view of the above problems, the problem to be solved by the present invention is to provide a cooling system for a vehicle equipped with a fuel cell that can perform suitable cooling in accordance with the driving situation of the vehicle.

The cooling system of the present invention that solves the above problems is as follows.
A vehicle cooling system equipped with a fuel cell,
The cooling air is arranged so that at least a part of the overlapping portion is generated in the flow path of the cooling air in the flow direction of the cooling air generated by driving the vehicle and / or driving a predetermined mechanical device provided in the vehicle. A plurality of heat exchangers that exchange heat with
The present invention includes an actuator that moves at least some of the installation positions of the plurality of heat exchangers so that the size of the overlapping portion changes according to the driving situation of the vehicle.

  The cooling system having such a configuration moves at least a part of the installation positions of the plurality of heat exchangers so that the size of the overlapping portion in the flow path of the cooling air changes according to the driving situation of the vehicle. Therefore, it is possible to adjust the temperature and speed of the cooling air that hits the heat exchanger located on the downstream side of the cooling air, and to perform suitable cooling according to the driving situation of the vehicle.

  Further, in the cooling system having such a configuration, one of the plurality of heat exchangers is a drive system heat exchanger that cools a refrigerant that is disposed downstream of the cooling air and cools a predetermined device that drives the vehicle. The other one of the plurality of heat exchangers may be an air conditioning heat exchanger that is installed on the upstream side of the cooling air and cools the refrigerant of the in-vehicle air conditioning system provided in the vehicle.

  With such a configuration, heat exchange is performed with priority given to the drive system heat exchanger disposed downstream of the heat exchanger for air conditioning, and therefore suitable cooling that prioritizes vehicle running performance over air conditioning is performed. It can be carried out.

  In the cooling system having such a configuration, at least one of the drive system heat exchangers may be a heat exchanger that cools a refrigerant for cooling the fuel cell.

  With such a configuration, heat exchange is performed with priority given to the heat exchanger for the fuel cell, which has a large load in the cooling system for the vehicle equipped with the fuel cell, so that suitable cooling for stable traveling is performed. Can do.

  In the cooling system having such a configuration, the heat exchanger moved by the actuator may be an air conditioning heat exchanger.

  With such a configuration, by moving the air heat exchanger, the temperature and speed of the cooling air hitting the driving system heat exchanger installed on the downstream side of the cooling air are adjusted, so the driving system heat exchanger Can always be arranged at a position with good cooling efficiency in relation to the flow path of the cooling air, and suitable cooling can be performed.

  In the cooling system having such a configuration, the heat exchanger for air conditioning includes a plurality of heat exchange units connected in series or in parallel, and the actuator moves at least a part of the installation positions of the plurality of heat exchange units. It is good.

  With such a configuration, the degree of freedom of arrangement of the heat exchanger for air conditioning is improved, so that efficient arrangement can be performed. Therefore, a sufficient area can be secured for each heat exchanger and appropriate cooling can be performed.

  In the cooling system having such a configuration, the actuator may slide at least a part of the plurality of heat exchange units in a predetermined direction so as to approach the predetermined direction.

  With such a configuration, the heat exchange unit is moved by sliding movement, so that the arrangement of the heat exchange unit can be made compact. Therefore, a sufficient area can be secured for each heat exchanger and appropriate cooling can be performed.

  Further, in the cooling system having such a configuration, the actuator moves the installation position of the air conditioning heat exchanger to a predetermined position where the overlapping portion is reduced, and the driving system heat exchanger has insufficient capability. When the situation is reached, the in-vehicle air conditioning system may reduce the output of the air conditioning system.

  With such a configuration, if the capacity of the drive system heat exchanger is insufficient even if the heat exchanger for air conditioning is moved, the output of the air conditioning system will be reduced, so driving that is indispensable for vehicle travel Preferred cooling can be performed with priority given to the system equipment.

  The vehicle cooling system equipped with the fuel cell of the present invention can also be configured as a cooling control method for a cooling device provided in the vehicle equipped with the fuel cell.

A. Example:
Examples of the present invention will be described below.
A-1. General configuration of the cooling system 10:
FIG. 1 is an explanatory diagram showing a schematic configuration of a cooling system 10 for a vehicle equipped with a fuel cell as an embodiment of the present invention. The cooling system 10 includes an air conditioner system 20, a fuel cell system 30, an air conditioner cooling system 40, a fuel cell cooling system 60, a cooling fan 70, and a control computer 80.

  The air conditioning system 20 is a heat pump type air conditioning unit that performs air conditioning management in the vehicle interior, and includes an evaporator, a compressor, and the like. The air conditioner cooling system 40 to be described later is a part of the components of the air conditioner system 20, but in the present application, the air conditioner cooling system 40 will be separately taken out from the convenience of explanation.

  The fuel cell system 30 is a power generation system for generating power by an electrochemical reaction of the fuel cell, and includes a fuel cell stack 32, a fuel gas supply system, an oxidizing gas supply system, and the like (not shown). The electric power generated here is used as a power source for the vehicle. In the present embodiment, the fuel cell stack 32 employs a polymer electrolyte fuel cell, but other types may be used. Note that the fuel cell cooling system 60 described later is a part of the components of the fuel cell system 30, but in the present application, the fuel cell cooling system 60 will be separately described for convenience of explanation.

  The air conditioner cooling system 40 includes an air conditioner radiator 42, a compressor 46, a pipe 48, and an air conditioner radiator moving system 50. The air conditioner radiator 42 is a condenser for exchanging heat between the high-temperature refrigerant introduced from the air conditioner system 20 via the pipe 48 to the air conditioner radiator 42 and the vehicle speed air generated by the traveling of the vehicle as cooling air. Yes, three heat exchange units 42a to 42c are connected in parallel. In the present embodiment, carbon dioxide is used as the refrigerant, but various refrigerants such as hydrocarbons can be used. The compressor 46 is a compressor that is heated to a high temperature by compressing the refrigerant and is supplied to the air conditioner radiator 42. The air conditioner radiator moving system 50 is a mechanism for moving the installation position of the air conditioner radiator 42 according to the driving state of the vehicle. Details of the air conditioner cooling system 40 constituted by these devices will be described later with reference to FIG.

  The fuel cell cooling system 60 includes a fuel cell radiator 62, a cooling water circulation pump 64, and a pipe 66. The fuel cell radiator 62 is a heat exchanger for exchanging heat between the coolant circulating through the fuel cell stack 32 via the coolant circulation pump 64 and the pipe 66 and the vehicle speed wind. The temperature of the fuel cell stack 32 is suitably adjusted by absorbing the heat generated by the above. The fuel cell radiator 62 is installed on the downstream side of the vehicle speed wind with respect to the air conditioner radiator 42 described above. In this example, an antifreeze containing ethylene glycol was used as a refrigerant. However, other antifreeze and pure water, rust preventive additives, ion exchange resins added thereto, and various refrigerants such as air were used. Also good.

  The cooling fan 70 is an intake fan for generating cooling air in an auxiliary manner when the vehicle traveling speed is slow and sufficient vehicle speed wind for heat exchange in the air conditioner radiator 42 and the fuel cell radiator 62 is not generated. It is.

  The control computer 80 is configured as a microcomputer including a CPU, a RAM, and a ROM therein, and receives signals from various sensors included in the air conditioner system 20 and the fuel cell system 30 to receive the air conditioner system 20, the fuel cell system 30, The entire operation of the cooling system 10 including the air conditioner radiator moving system 50 is controlled. In the present embodiment, the control computer 80 controls all the systems and devices constituting the cooling system 10, but some of them may be distributedly controlled.

A-2. Detailed configuration of the air conditioning cooling system 40:
Next, a detailed configuration of the air conditioner cooling system 40 will be described with reference to FIG. The air conditioner radiator 42 constituting the air conditioner cooling system 40 of the present embodiment is composed of three heat exchange units 42a to 42c having the same size. As shown in FIG. 2B, these heat exchange units 42a to 42c are arranged in the flow direction of the vehicle speed wind so as to overlap each other in the flow path of the vehicle speed wind as shown in FIG. 2 (b). Yes. On the other hand, when the air conditioner radiator 42 is viewed from the side of the vehicle, as shown in FIG. 2 (a), the heat exchange units are arranged so as to be offset vertically so that there is no overlapping portion in the flow path of the vehicle speed wind. Yes.

  These heat exchange units 42a to 42c are connected in parallel by pipings 48a to 48f having a flexible structure. In other words, the air-conditioning refrigerant supplied from the pipe 48a to the heat exchange unit 42c is also supplied to the heat exchange units 42b and 42a in parallel via the pipes 48b and 48c. And the refrigerant | coolant supplied to each of heat exchange unit 42a-42c passes through the heat exchange part (fin tube) with which each of heat exchange unit 42a-42c is equipped, and heat-exchanges with vehicle speed wind, and is cooled. The refrigerant cooled by the heat exchange unit 42c merges with the refrigerant cooled by the heat exchange unit 42b via the pipe 48d, and further merges with the refrigerant cooled by the heat exchange unit 42a via the pipe 48e. And discharged to the pipe 48f. Thus, by connecting a plurality of heat exchange units in parallel, the flow resistance of the refrigerant for the air conditioner in one series can be reduced as compared with the case of connecting in series, and the temperature difference from the vehicle speed wind can be reduced. Since more places can be taken, efficient heat exchange can be performed. However, these heat exchange units 42a to 42c may be connected in series.

  Further, the heat exchange units 42a and 42b are provided with an air conditioner radiator moving system 50. The air conditioner radiator moving system 50 includes guide rails 52a to 52h fitted to the air conditioner radiator 42, motors 56a and 56b as actuators, drive belts 54a and 54b driven by pulleys by the motors 56a and 56b, and drive belts. And brackets 58a and 58b for connecting the air conditioner radiator 42.

  In this system, the drive belt 54a is rotated by driving the electric motor 56a, so that the heat exchange unit 42a connected by the drive belt 54a and the bracket 58a is moved upward along the guide rails 52a to 52d installed in the vertical direction. It can be moved in the direction. The heat exchange unit 42b can also be moved upward by the same mechanism. The air conditioner radiator moving system 50 is not limited to the above-described mode, and various moving mechanisms can be used.

  Further, a fuel cell radiator 62 is disposed downstream of the heat exchange units 42a to 42c so as to overlap the heat exchange units 42a to 42c in the flow path of the vehicle speed wind. In the fuel cell radiator 62, heat exchange is performed between the vehicle speed wind, which has been heated by the heat exchange in the heat exchange units 42a to 42c and the wind speed has been reduced, and the fuel cell refrigerant. Then, the vehicle speed wind that has passed through the fuel cell radiator 62 and has been further heated is guided to the lower part of the vehicle and discharged outside the vehicle. In the present embodiment, the heat exchange units 42a to 42c and the fuel cell radiator 62 are completely sized and positioned in the flow path of the vehicle speed wind, but the heat exchange units 42a to 42c as a whole. And the size of the fuel cell radiator 62 may not be the same, or may be partially overlapped.

A-3. Control of the cooling system 10:
Next, an example of the control procedure of the cooling system 10 will be described using the flowchart of FIG. This process is a process of controlling the cooling system 10 so as to perform suitable cooling according to the driving situation of the vehicle. In this process, first, the control computer 80 determines whether or not the temperature of the fuel cell stack 32 is equal to or higher than a predetermined value TH (step S100). As a result, if it is less than the predetermined value TH (step S100: NO), it means that the temperature of the fuel cell stack 32 is in an appropriate range, that is, the driving condition of the vehicle is good. There is no need to control, and the process is terminated.

  On the other hand, if the temperature of the fuel cell stack 32 is equal to or higher than the predetermined value TH (step S100: YES), it means that the temperature of the fuel cell stack 32 exceeds an appropriate range. Therefore, since it is necessary to return the temperature of the fuel cell stack 32 to an appropriate range, the control computer 80 performs radiator-mounted variable control (step S110).

  This radiator-mounted variable control will be described with reference to FIG. When this process is started, the control computer 80 sends an instruction to the air conditioner radiator moving system 50 to install the heat exchange unit 42a constituting the air conditioner radiator 42, or the heat exchange unit 42a and the heat exchange unit 42b. Is moved in the direction of the upper surface of the vehicle. The amount of movement at this time is determined in a stepwise manner according to the temperature of the fuel cell stack 32 used for the determination in step S100. In the present embodiment, the installation positions when these heat exchange units are moved to the maximum in the direction of the upper surface of the vehicle, as seen from the side of the vehicle, are the heat exchange unit 42a and the heat exchange unit 42b as shown in FIG. Is the position at which the installation height is the same as the heat exchange unit 42c. In addition, if this state is seen from the vehicle upper surface, as shown in FIG.4 (b), it has not changed from the state shown in FIG.2 (b).

  As described above, the installation positions of the heat exchange unit 42a and the heat exchange unit 42b are moved by the vehicle speed guided to the fuel cell radiator 62 without being heated by the air conditioner radiator 42 and without reducing the wind speed. This is because the cooling efficiency of the fuel cell radiator 62 is improved by increasing the wind.

  In the above example, when it is determined in step S100 that the temperature of the fuel cell stack 32 is equal to or higher than the predetermined value TH, the heat exchange unit 42a and the heat exchange unit 42b are positioned as shown in FIG. However, the illustrated position is merely an example. For example, depending on the space conditions of the vehicle, the heat exchange units 42a to 42c may be moved to an upper portion than the state illustrated in FIG. Further, as described above, the movement of the heat exchange units 42a to 42c is not limited to the stepwise movement according to the temperature of the fuel cell stack 32, and moves to the set uppermost position if the predetermined value TH is exceeded. It is good also as what to do.

  In the present embodiment, as described above, the installation positions of the heat exchange units 42a and 42b are moved to the upper part of the vehicle. As described above, since the flow of the vehicle speed wind passes through the fuel cell radiator 62 and is guided to the lower part of the vehicle as described above, the air conditioner radiator 42 is provided below the fuel cell radiator 62. This is because the cooling efficiency of the fuel cell radiator 62 can be further improved by securing a vehicle speed wind path that is not affected by the above. Therefore, for example, when the flow of the vehicle speed wind is in two directions, the flow toward the lower part of the vehicle and the flow toward the hood side of the vehicle, the installation position of the heat exchange unit 42a is moved in the upper direction of the vehicle. The installation position of the heat exchange unit 42c is moved toward the lower part of the vehicle, the heat exchange units 42a to 42c are moved to the center of the vehicle, and the wind that is not affected by the air conditioner radiator 42 is placed on the upper and lower parts of the fuel cell radiator 62. It is good also to secure the way. In other words, it is desirable to determine which heat exchange unit moves in which direction in consideration of a direction that does not obstruct the wind path of the vehicle speed wind in order to further improve the cooling efficiency of the fuel cell radiator 62.

  Then, when the radiator mounting variable control is performed, the control computer 80 determines again whether or not the temperature of the fuel cell stack 32 is equal to or higher than a predetermined value TH (step S120). As a result, if it is less than the predetermined value TH (step S120: NO), the temperature of the fuel cell stack 32 has returned to an appropriate range due to the improvement of the cooling efficiency of the fuel cell radiator 62 based on step S110. Therefore, it is not necessary to further control the cooling system 10, and the process is terminated.

  On the other hand, if the temperature of the fuel cell stack 32 is equal to or higher than the predetermined value TH (step S120: YES), it means that the temperature of the fuel cell stack 32 still exceeds the appropriate range. Therefore, the control computer 80 determines whether or not the cooling control is performed to the maximum (step S130). In the present embodiment, the criterion for determining whether or not the above-described cooling control is performed to the maximum is whether or not the positions of the heat exchange units 42a to 42c have moved to the set uppermost position in step S110. It is.

  As a result, if the cooling control is not performed to the maximum (step 130: NO), the control computer 80 returns the process to step S110. That is, in consideration of the temperature of the fuel cell stack 32 used for the determination in step S120, the radiator mounting variable control is performed again to lower the temperature of the fuel cell stack 32.

  On the other hand, if the cooling control is performed to the maximum (step 130: YES), the radiator-mounted variable control that lowers the temperature of the fuel cell stack 32 cannot be performed any more. Therefore, the control computer 80 sets the output of the air conditioner system 20 to zero as further temperature lowering means (step S140). As described above, the output of the air conditioner system 20 is made zero by suppressing the temperature of the vehicle speed wind guided to the fuel cell radiator 62 from being increased by the air conditioner radiator 42. This is to improve the cooling efficiency. Thus, the cooling system control is completed. In step S140, the output is not limited to zero, and the output may be cut according to the temperature of the fuel cell stack 32 used in the determination in step S120.

  In this embodiment, the cooling system control is performed in steps S100 and S120 using the temperature of the fuel cell stack 32 as a criterion. However, the present invention is not limited to this. For example, a configuration that is determined based on whether the temperature of the EV radiator has risen above a predetermined value, a configuration that is determined based on whether the IV characteristic of the fuel cell stack 32 has decreased below a predetermined value, or an accelerator It is a situation where the ability of the heat exchanger for cooling the drive system device that constitutes the cooling system 10 such as a configuration that is determined by whether or not the output is not output even when stepped on, or a combination thereof, is insufficient. It can be set as the structure using the various reference | standard which shows.

  In the present embodiment, an example in which the temperature of the fuel cell stack 32 is lowered only by the radiator-mounted variable control has been described. However, the present invention is not limited to this and may be combined with various cooling control methods. For example, in step 110, the output control of the cooling water circulation pump 64 and the cooling fan 70 is performed together with the radiator mounting variable control. In step S130, the criterion for determining whether or not the cooling control is performed to the maximum. In addition to the positions of the heat exchange units 42a to 42c, the outputs of the cooling water circulation pump 64 and the cooling fan 70 may be added. If it carries out like this, cooling control can be performed, without reducing the output of the air-conditioner system 20 as much as possible.

  The cooling system 10 having such a configuration moves the installation position of the air conditioner radiator 42 arranged on the upstream side of the vehicle speed wind according to the driving state of the vehicle, so that the temperature of the air conditioner radiator 42 is not increased. The vehicle speed wind guided to the fuel cell radiator 62 can be increased without lowering the wind speed. Therefore, the fuel cell radiator 62 can perform suitable cooling in accordance with the driving state of the vehicle.

  Further, in the cooling system 10 having such a configuration, since the air conditioner radiator 42 is configured by a plurality of heat exchange units, the degree of freedom in arrangement is improved and the efficiency is improved as compared with the case where the cooling system 10 is configured by a single heat exchange unit. Arrangement is possible. Therefore, it is possible to ensure a sufficient area of each radiator and perform appropriate cooling.

  Moreover, since the cooling system 10 having such a configuration moves the heat exchange unit constituting the air conditioner radiator 42 with a small dead space by sliding movement, the heat exchange unit can be arranged in a compact manner. Therefore, it is possible to ensure a sufficient area of each radiator and perform appropriate cooling.

  In the cooling system 10 having such a configuration, the air conditioner radiator 42 is installed on the upstream side of the vehicle speed wind, the fuel cell radiator 62 is installed on the downstream side, and the air conditioner radiator 42 is moved according to the situation of the vehicle. The cooling of the fuel cell radiator 62 on the side can be prioritized, that is, suitable cooling can be performed with priority on traveling performance over air conditioning. Thus, it is desirable to install the radiator which gives priority to cooling on the downstream side of the vehicle speed wind.

  Further, the cooling system 10 having such a configuration fixes the fuel cell radiator 62 and moves the air conditioner radiator 42, so that the fuel cell radiator 62 is always in a position where the cooling efficiency is good in relation to the flow path of the vehicle speed wind. Arranged and suitable cooling can be performed.

  In addition, the cooling system 10 having such a configuration is used when the capacity of a heat exchanger for cooling a drive system device such as the fuel cell radiator 62 is insufficient even when the air conditioner radiator 42 is moved. Since the output of 20 is reduced, suitable cooling can be performed with priority given to drive system devices indispensable for traveling of the vehicle.

B. Variation:
Next, some modifications of the present invention will be illustrated.
B-1. Modification 1:
A detailed configuration of an air conditioner radiator 42 as a first modification is shown in FIG. In this example, three heat exchange units 42d to 42f of the same size constituting the air conditioner radiator 42 are arranged so as to be offset so as not to overlap each other in the flow path of the vehicle speed wind (FIG. 5B). , The heat exchange units 42d and 42e are one-dot chain lines in the figure).

  In the heat exchange units 42d to 42f, in the radiator mounted variable control in step S110, as shown in FIG. 5B (the heat exchange units 42d and 42e are solid line portions), the vehicle speed wind And move to the right to a position overlapping the heat exchange unit 42f.

  Thus, the movement of the heat exchange unit constituting the air conditioner radiator 42 is not limited to the vertical movement of the vehicle shown in the embodiment, but may be the horizontal direction of the vehicle. Alternatively, it may be movable in an oblique direction or both in the vertical direction and the horizontal direction.

B-2. Modification 2:
A detailed configuration of an air conditioner radiator 42 as a second modification is shown in FIG. In this example, the four heat exchange units 42h to 42k having the same size and the heat exchange unit 42g having a size corresponding to two of these heat exchange units are included in the air conditioner radiator 42. In FIG. 6 (b), the heat exchange units 42h to 42k are indicated by alternate long and short dash lines in the figure.

  In the heat exchange units 42g to 42k, in the radiator mounted variable control in step S110, the heat exchange units 42h and 42i move in the left direction of the vehicle, and the heat exchange units 42j and 42k move in the right direction, thereby exchanging heat. The units 42h to 42k are moved to the center of the vehicle, and as shown in FIG. 6B (the heat exchange units 42h to 42k are solid line portions), the heat exchange unit 42g disposed on the upstream side of the vehicle speed wind in the flow path of the vehicle speed wind. Move to the position where it overlaps.

  As described above, the air conditioner radiator 42 is not limited to the configuration of the three heat exchange units shown in the embodiment, and may be configured by an arbitrary number of units including a single unit. Further, when the air conditioner radiator 42 is constituted by a plurality of heat exchange units, the heat exchange units are not limited to the same size as shown in the embodiment, but as shown in this example, You may include what differs. Of course, all the heat exchange units may have different sizes.

B-3. Modification 3:
FIG. 7 shows a detailed configuration of an air conditioner radiator 42 as a third modification. In this example, two heat exchange units 42m and 42n of the same size constituting the air conditioner radiator 42 are arranged side by side in the left-right direction of the vehicle so that there is no overlapping portion in the flow path of the vehicle speed wind ( Dash-dotted line portion in the figure).

  In the heat exchange units 42m and 42n, in the radiator mounting variable control in step S110, the heat exchange units 42m and 42n are replaced with the heat exchange units 42m and 42n as shown in FIG. 7B (solid line portion in the drawing). And the fuel cell radiator 62 are curvedly moved to the side surface of the vehicle so as not to overlap in the flow path of the vehicle speed wind.

  As described above, the movement of the air conditioner radiator 42 is not limited to the vertical movement or the horizontal movement of the vehicle. A curved rail mechanism or the like may be used to move three-dimensionally including the vehicle front-rear direction.

B-4. Modification 4:
FIG. 8 shows a detailed configuration of an air conditioner radiator 42 as a fourth modification. In this example, three heat exchange units 42o to 42q of the same size constituting the air conditioner radiator 42 are arranged side by side in the left-right direction of the vehicle so that there is no overlapping portion in the flow path of the vehicle speed wind (see FIG. The one-dot chain line part).

  In the heat exchange units 42o to 42q, in the radiator-mounted variable control in step S110, the heat exchange units 42o to 42q are heated as viewed from the top of the vehicle as shown in FIG. 8B (solid line portion in the figure). Rotate and move in the same direction around the midpoint of the short side of the replacement unit. Thus, the movement of the air conditioner radiator 42 is not limited to the linear movement as shown in the embodiment, and may be a rotational movement using a rotary shaft or the like.

B-5. Modification 5:
FIG. 9 shows a detailed configuration of an air conditioner radiator 42 as a fifth modification. In this example, three heat exchange units 42r to 42t of the same size constituting the air conditioner radiator 42 are arranged side by side in the left-right direction of the vehicle so that there is no overlapping portion in the flow path of the vehicle speed wind ( In FIG.9 (b), the heat exchange units 42r and 42t are the dashed-dotted line parts in a figure.

  In the heat exchanging units 42r to 42t, in the radiator mounted variable control in step S110, the heat exchanging units 42r and 42t are arranged as shown in FIG. 9B (solid line portion in the figure) as seen from the vehicle upper surface. Folds in the direction of the inside. Thus, the movement of the air conditioner radiator 42 is not limited to the linear movement as shown in the embodiment, but may be folded using a hinge mechanism or the like.

  As described above, various modes can be set for the number, arrangement, movement mode, and the like of the heat exchange units constituting the air conditioner radiator 42. These modes may be appropriately set according to the vehicle space conditions and the required cooling efficiency of the fuel cell radiator 62.

  As mentioned above, although the Example of this invention was described, this invention is not limited to such an Example, Of course, in the range which does not deviate from the summary of this invention, it can implement in a various aspect. For example, in the present embodiment, the air conditioner radiator 42 is moved when the capacity of the heat exchanger for cooling the drive system becomes insufficient, such as when the temperature of the fuel cell stack 32 exceeds a predetermined value. However, the present invention is not limited to such an embodiment. For example, when the air conditioner system 20 is not used, the position of the air conditioner radiator 42 may be changed according to various vehicle driving conditions, such as moving the air conditioner radiator 42. Further, in this embodiment, the cooling control is performed by moving the air conditioner radiator 42. However, the present invention is not limited to this mode, and the fuel cell radiator 62 is moved or both of them are moved. Also good. Of course, the cooling system of the present invention can be applied not only to the combination of the air conditioner cooling system 40 and the fuel cell cooling system 60 but also to various combinations of radiators mounted on the vehicle.

It is explanatory drawing which shows schematic structure of the cooling system 10 of the fuel cell mounting vehicle as an Example of this invention. It is explanatory drawing which shows the detailed structure of the radiator 42 for air conditioners. 3 is a flowchart illustrating an example of a control procedure of the cooling system 10. It is explanatory drawing about a radiator mounting variable control. It is explanatory drawing which shows the detailed structure of the radiator 42 for air conditioners as the modification 1. As shown in FIG. It is explanatory drawing which shows the detailed structure of the radiator 42 for air conditioners as the modification 2. FIG. It is explanatory drawing which shows the detailed structure of the radiator 42 for air conditioners as the modification 3. FIG. It is explanatory drawing which shows the detailed structure of the radiator 42 for air conditioners as the modification 4. FIG. It is explanatory drawing which shows the detailed structure of the radiator 42 for air conditioners as the modification 5. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 ... Cooling system 20 ... Air-conditioner system 30 ... Fuel cell system 32 ... Fuel cell stack 40 ... Air-conditioner cooling system 42 ... Radiator for air-conditioners 42a-42t ... Heat exchange unit 46 ... Compressor 48 ... Piping 48a-48f ... Piping 50 ... Radiator moving system for air conditioners 52a-52h ... Guide rails 54a, 54b ... Drive belts 56a, 56b ... Electric motor 58a, 58b ... Bracket 60 ... Fuel cell cooling system 62 ... Radiator for fuel cell 64 ... Cooling water circulation pump 66 ... Piping 70 ... Cooling fan 80 ... Control computer

Claims (8)

A vehicle cooling system equipped with a fuel cell,
The cooling air is arranged so that at least a part of the overlapping portion is generated in the flow path of the cooling air in the flow direction of the cooling air generated by driving the vehicle and / or driving a predetermined mechanical device provided in the vehicle. A plurality of heat exchangers that exchange heat with
A cooling system comprising: an actuator that moves at least some of the installation positions of the plurality of heat exchangers such that the size of the overlapping portion changes according to a driving situation of the vehicle. The cooling system of claim 1,
One of the plurality of heat exchangers is a drive system heat exchanger that is disposed downstream of the cooling air and cools a refrigerant for cooling a predetermined device that drives the vehicle.
Another one of the plurality of heat exchangers is an air conditioning heat exchanger that is installed on the upstream side of the cooling air and cools a refrigerant in an in-vehicle air conditioning system provided in the vehicle. The cooling system according to claim 2,
At least one of the drive system heat exchangers is a heat exchanger that cools a refrigerant for cooling the fuel cell. A cooling system according to claim 2 or claim 3, wherein
The heat exchanger moved by the actuator is the air-conditioning heat exchanger. The cooling system according to claim 4,
The air conditioning heat exchanger includes a plurality of heat exchange units connected in series or in parallel.
The said actuator moves at least one part of the installation position of these heat exchange units. Cooling system. The cooling system according to claim 5,
The cooling system that slides at least a part of the plurality of heat exchange units in a predetermined direction and moves the actuator in the predetermined direction. A cooling system according to any one of claims 2 to 6,
When the actuator has moved the installation position of the air-conditioning heat exchanger to a predetermined position where the overlapping portion is reduced, and has reached a predetermined situation where the capacity of the drive system heat exchanger is insufficient The interior air conditioning system is a cooling system that reduces the output of the air conditioning system. A cooling control method for a cooling device provided in a vehicle equipped with a fuel cell,
Arranged so that at least a part of the overlap occurs in the flow direction of the cooling air generated by running of the vehicle and / or driving of a predetermined mechanical device provided in the vehicle when viewed from the upstream side of the cooling air. And a cooling control method for moving at least a part of the installation positions of the plurality of heat exchangers that exchange heat with the cooling air so that the size of the overlapping portion changes according to the driving condition of the vehicle. .

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