JP2008186620A - Fuel cell system and its control method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To carry out scavenging control with appropriate operating sound in accordance with opening and closing states of a switching part fitted to a mobile unit for a fuel cell system provided with a fuel cell installed in the mobile unit. <P>SOLUTION: The fuel cell system, provided with a fuel cell 10 installed in the mobile unit, and a scavenging means (a compressor 24, a shutoff valve 33, a regulator 34, and a control device 4), is provided with a scavenging control means 4 enabled to operate with operating sound in accordance with opening and closing states of the switching part fitted to the mobile unit. The scavenging control means 4 changes an operating state of the scavenging means from a high operating sound state to a low operating sound state, in case the fuel cell 10 is at operation stoppage and the switching part moves from a closed state to an open state. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a fuel cell system and a control method thereof.

  Currently, a fuel cell system including a fuel cell that receives a supply of reaction gas (fuel gas and oxidizing gas) and generates electric power has been proposed and put into practical use. When power generation is performed with such a fuel cell system, moisture is generated inside the fuel cell due to an electrochemical reaction, but this moisture stays in the reaction gas flow path in the fuel cell, preventing the flow of the reaction gas. There is. In addition, when the fuel cell system is operated under a low temperature environment such as below freezing point, moisture existing inside the electrode (catalyst layer or diffusion layer) of the fuel cell may freeze and start-up performance may be significantly reduced. .

  In order to solve various problems due to moisture generated inside the fuel cell in this way, in recent years, when the operation of the fuel cell is stopped, dry oxygen is supplied to the reaction gas flow path according to the wet state in the fuel cell. In addition, a technique (scavenging technique) for removing moisture in the fuel cell by supplying dry hydrogen is proposed.

On the other hand, the fuel cell may be mounted on various mobile bodies (vehicles, robots, ships, aircrafts, etc.) and serve as a drive source, but an air compressor used as a gas supply means into the fuel cell is There is a problem that the comfort of the occupant of the moving body is impaired by the noise during the driving. Therefore, in order to reduce occupant discomfort caused by noise during gas supply into the fuel cell, a technique for controlling the rotation speed of the air compressor so as not to increase rapidly has been proposed (for example, Patent Documents). 1).
JP 2006-25495 A

  However, in the control method described in Patent Document 1, although the noise of the air compressor is not disturbed in comparison with other noise (traveling noise) generated from the moving body during traveling, the fuel cell However, the noise caused by scavenging when the operation was stopped, in particular, the discomfort caused by the noise felt by the passengers when coming out of the stopped moving body was not reduced.

  The present invention has been made in view of such circumstances, and in a fuel cell system including a fuel cell disposed in a moving body, appropriately suppresses noise due to the operation of the scavenging means when the fuel cell is stopped. With the goal.

  In order to achieve the above object, a fuel cell system according to the present invention is a fuel cell system comprising a fuel cell disposed in a moving body, and scavenging means for discharging moisture in the fuel cell to the outside. A scavenging control means for controlling the scavenging means so as to operate with an operating sound corresponding to the open / closed state of the open / close section provided on the body is provided.

  According to this configuration, the operation sound of the scavenging means can be adjusted and operated according to the open / closed state of the open / close section provided on the moving body. Therefore, for example, the operating sound can be adjusted according to whether the operating sound inside the moving body or the external operating sound is in the passenger's ear, and the generation of noise unpleasant to the passenger is appropriately suppressed. can do.

  Further, in the fuel cell system, it is possible to employ a scavenging control means for controlling the scavenging means so that the operation sound is reduced when the opening / closing part is in the open state than when the opening / closing part is in the closed state. .

  This reduces the discomfort of the occupant even when noise from the outside of the moving body enters the ears of the occupant inside the moving body due to the opening / closing portion of the moving body being in the open state. It becomes possible.

  Further, in the fuel cell system, when the fuel cell is in an operation stop state and the opening / closing part shifts from the closed state to the open state, the operation state of the scavenging means is switched from the high operation sound state to the low operation sound state. A scavenging control means can be employed.

  In this way, it is possible to reduce the noise felt by the occupant when the fuel cell is stopped and the opening / closing part is in the open state, and the occupant's discomfort can be reduced. In addition, since the scavenging means can be operated in a high operating sound state (that is, a high output state) until the opening / closing part is opened, it is possible to shorten the operation time of the scavenging means after the fuel cell is stopped. Become.

  Further, the fuel cell system has control data associated with the state of the moving body or the state of the fuel cell, and based on the control data, the operation time and the low operation sound state of the scavenging means in the high operation sound state. It is possible to employ a scavenging control means for setting the operation time at.

  In this way, it is possible to set a more appropriate scavenging means operation pattern in consideration of various conditions such as the amount of water in the fuel cell, the temperature environment, and the travel time of the moving body.

  In the fuel cell system, an opening / closing part having a door for getting on and off the moving body can be adopted.

  If it does in this way, the noise which a passenger | crew will feel when opening the door of a moving body and going out can be reduced, and the discomfort at the time of a passenger | crew's getting off can be reduced.

  Further, a control method for a fuel cell system according to the present invention is a control method for a fuel cell system comprising: a fuel cell disposed in a moving body; and scavenging means for discharging moisture in the fuel cell to the outside. A first step of determining an open / close state of the open / close section provided in the moving body, and a second step of operating the scavenging means with an operating sound corresponding to the open / close state determined in the first step. Is.

  According to this method, the operation sound of the scavenging means can be adjusted and operated according to the open / closed state of the open / close section provided in the moving body. Therefore, for example, the operating sound can be adjusted according to whether the operating sound inside the moving body or the external operating sound is in the passenger's ear, and the generation of noise unpleasant to the passenger is appropriately suppressed. can do.

  Further, in the control method, in the second step, the scavenging means can be operated so that the operating noise is reduced when the opening / closing part is in the open state than when the opening / closing part is in the closed state.

  This reduces the discomfort of the occupant even when noise from the outside of the moving body enters the ears of the occupant inside the moving body due to the opening / closing portion of the moving body being in the open state. It becomes possible.

  Further, in the control method, in the first step, it is determined whether or not the fuel cell is in an operation stop state and the opening / closing part has shifted from the closed state to the open state. In the second step, the fuel cell is determined. Is switched from the high operating sound state to the low operating sound state when it is determined in the first step that the open / close portion has shifted from the closed state to the open state. be able to.

  In this way, it is possible to reduce the noise felt by the occupant when the fuel cell is stopped and the opening / closing part is in the open state, and the occupant's discomfort can be reduced. In addition, since the scavenging means can be operated in a high operating sound state (that is, a high output state) until the opening / closing part is opened, it is possible to shorten the operation time of the scavenging means after the fuel cell is stopped. Become.

  In the control method, in the second step, based on control data associated with the state of the moving body or the state of the fuel cell, the operation time in the high operation sound state and the low operation sound state of the scavenging means. Can be set.

  In this way, it is possible to set a more appropriate scavenging means operation pattern in consideration of various conditions such as the amount of water in the fuel cell, the temperature environment, and the travel time of the moving body.

  ADVANTAGE OF THE INVENTION According to this invention, in a fuel cell system provided with the fuel cell arrange | positioned at a mobile body, it becomes possible to suppress appropriately the noise by the action | operation of the scavenging means at the time of a fuel cell operation stop.

  Hereinafter, a fuel cell system 1 according to an embodiment of the present invention will be described with reference to the drawings. In the present embodiment, an example in which the present invention is applied to an in-vehicle power generation system of a fuel cell vehicle 100 (FIG. 2) as a moving body will be described.

  First, the configuration of the fuel cell system 1 according to the embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the fuel cell system 1 according to the present embodiment includes a fuel cell 10 that generates electric power upon receiving a supply of reaction gas (oxidation gas and fuel gas), and the fuel cell 10 has an oxidant gas. An oxidizing gas piping system 2 for supplying the air, a hydrogen gas piping system 3 for supplying hydrogen gas as a fuel gas to the fuel cell 10, a control device 4 for integrated control of the entire system, and the like.

  The fuel cell 10 has a stack structure in which a required number of unit cells that generate power upon receiving a reaction gas are stacked. The electric power generated by the fuel cell 10 is supplied to a PCU (Power Control Unit) 11. The PCU 11 includes an inverter that supplies electric power to the traction motor 12 of the fuel cell vehicle 100, an inverter that supplies electric power to various auxiliary devices such as a compressor motor and a hydrogen pump motor, charging the secondary battery, and from the secondary battery. A DC-DC converter for supplying power to the motors is provided.

  The oxidant gas piping system 2 includes an air supply passage 21 that supplies the oxidant gas (air) humidified by the humidifier 20 to the fuel cell 10, and an air exhaust that guides the oxidant off-gas discharged from the fuel cell 10 to the humidifier 20. A flow path 22 and an exhaust flow path 23 for guiding the oxidizing off gas from the humidifier 21 to the outside are provided. The air supply passage 21 is provided with a compressor 24 that takes in the oxidizing gas in the atmosphere and pumps it to the humidifier 20. The operation of the compressor 24 is controlled by the control device 4.

  The hydrogen gas piping system 3 includes a hydrogen tank 30 as a fuel supply source storing high-pressure hydrogen gas, a hydrogen supply flow path 31 for supplying the hydrogen gas in the hydrogen tank 30 to the fuel cell 10, and the fuel cell 10. A circulation flow path 32 for returning the discharged hydrogen off-gas to the hydrogen supply flow path 31.

  The hydrogen supply flow path 31 is provided with a shutoff valve 33 that shuts off or allows the supply of hydrogen gas from the hydrogen tank 30 and a regulator 34 that adjusts the pressure of the hydrogen gas. In the present embodiment, a modulatable pressure regulator 34 that can change the target value of the supply pressure by a step motor is employed. The operations of the shut-off valve 33 and the regulator 34 are controlled by the control device 4.

  A discharge channel 37 is connected to the circulation channel 32 via a gas-liquid separator 35 and an exhaust drain valve 36. The gas-liquid separator 35 collects moisture from the hydrogen off gas. The exhaust / drain valve 36 is operated according to a command from the control device 4 to discharge (purge) moisture collected by the gas-liquid separator 35 and hydrogen off-gas containing impurities in the circulation flow path 32 to the outside. Is. The circulation channel 32 is provided with a hydrogen pump 38 that pressurizes the hydrogen off-gas in the circulation channel 32 and sends it to the hydrogen supply channel 31 side. The gas in the discharge channel 37 is diluted by a diluter (not shown), and merges with the gas in the exhaust channel 23 in the discharge pipe 39.

  As shown in FIG. 2, the fuel cell 10 is fixed to the vehicle body in a state where the fuel cell 10 is disposed at a substantially central portion in the front-rear direction of the fuel cell vehicle 100. Various pipes (exhaust flow path 23, discharge flow path 37, discharge pipe 39, etc.) connected to the fuel cell 10 are disposed rearward from a substantially central portion in the front-rear direction of the fuel cell vehicle 100. In addition, an outlet for the water flowing in the gas flow path inside the fuel cell 10 is provided behind the fuel cell 10.

  Further, the fuel cell vehicle 100 includes a door 50 for getting on and off, a door opening and closing device (not shown) for opening and closing the door 50 according to the operation of the occupant, and detection means for detecting the opening and closing state of the door 50. And an open / close sensor (not shown). The door 50 corresponds to an embodiment of the opening / closing part in the present invention.

  The door 50 is configured to be able to open and close an opening (entrance / exit) provided in the vehicle body of the fuel cell vehicle 100. For example, the door 50 extends along a hinged door whose one end is connected to the vehicle body by a hinge mechanism or an entrance / exit. A sliding door that is slidably driven can be employed. The door opening and closing device includes an operation unit such as a door remote control and a door handle switch that receives an operation by an occupant, a drive unit that opens and closes the door 50 according to a signal from the operation unit, and the like. Note that the door opening / closing device may open and close the door 50 in accordance with a signal from the control device 4 of the fuel cell vehicle 100 in addition to a signal from the operation unit. The open / close sensor detects, for example, the opening degree of the door 50, and an encoder that detects the amount of rotation of the hinge mechanism, a Hall IC that detects the position of the door 50, or the like can be employed. Information relating to the open / closed state of the door 50 output from the open / close sensor is transmitted to the control device 4 and used for scavenging control.

  The control device 4 receives control information such as an accelerator signal (required load) of a vehicle (not shown) and controls operations of various devices in the system. The control device 4 is configured by a computer system (not shown). Such a computer system includes a CPU, ROM, RAM, HDD, input / output interface, display, and the like, and various control operations are realized by the CPU reading and executing various control programs recorded in the ROM. It is like that.

  Specifically, the control device 4 drives and controls the compressor 24, the shut-off valve 33, and the regulator 34 to supply gas (oxidizing gas and hydrogen gas) into the fuel cell 10 to thereby remove moisture in the fuel cell 10. Carry out “scavenging” exhausted to the outside. That is, the compressor 24, the shutoff valve 33, the regulator 34, and the control device 4 constitute one embodiment of the scavenging means in the present invention. When the scavenging is performed, the water remaining in the fuel cell 10 is discharged to the air discharge channel 22 and the circulation channel 32, and the fuel cell passes through the exhaust channel 23, the discharge channel 37, and the discharge pipe 39. It is discharged outside the vehicle 100. Note that the control device 4 temporarily suppresses or stops the humidification of the oxidizing gas by the humidifier 20 when performing scavenging.

  In the scavenging control performed when the operation of the fuel cell 10 is stopped (when power generation is stopped), the control device 4 in the present embodiment operates with an appropriate operating sound according to the open / closed state of the door 50 provided in the fuel cell vehicle 100. To control the scavenging means. That is, the control device 4 functions as an embodiment of the scavenging control means in the present invention.

  When the operation of the fuel cell 10 is stopped (when power generation is stopped), the control device 4 controls the scavenging means with an operation pattern as shown in FIG. 3 based on information on the open / close state of the door 50 detected by the open / close sensor. Do.

  Specifically, as shown in FIG. 3, the control device 4 causes the compressor 24 to rotate at a high speed when the door 50 is in a completely closed state (closed state: the opening degree of the door 50 is 0). A high output that drives and controls the shutoff valve 33 and the regulator 34 appropriately according to this to make the discharge rate of moisture in the fuel cell 10 relatively higher than the low output scavenging described later. Perform scavenging. On the other hand, when the door 50 is not completely closed (open state: the opening degree of the door 50 is not 0), the compressor 24 has a rotational speed relatively higher than the rotational speed in the open state (high rotation). The drive is performed at a low low rotation, and the shutoff valve 33 and the regulator 34 are appropriately driven and controlled accordingly, so that the discharge rate of moisture in the fuel cell 10 to the outside is relatively lower than in the open state. Perform output scavenging. In this way, when the door 50 is in the open state, the operating noise of the compressor 24 and the like is relatively reduced compared to when the door 50 is in the closed state.

  That is, in the present embodiment, it is assumed that the occupant opens the door 50 and goes out of the vehicle after a predetermined time has elapsed after the fuel cell 10 has stopped operating. And in order to reduce the discomfort felt from the noise due to the operation of the scavenging means when the occupant goes out of the vehicle, the control device 4 operates the scavenging means with the high output scavenging before the door 50 is opened. After the door 50 is opened, the operation means is switched to low-power scavenging, and thereafter, the operation means is operated with an operation pattern in which the scavenging means is operated with a relatively low operating sound compared to before the door 50 is opened to complete the scavenging. To control.

  Further, the control device 4 sets the operation time of the scavenging means in the operation pattern of FIG. 3 using a map as shown in FIG. When the scavenging is performed, the control device 4 stops the operation of the scavenging means at the time when the removal of the water in the fuel cell 10 is completed, so that the scavenging means is operated unnecessarily long and energy is wasted. In addition, the occurrence of dry-up (insufficient water in the electrolyte membrane) due to excessive drying of the fuel cell 10 is suppressed. Therefore, in the map shown in FIG. 4, in the operation pattern of switching from high-output scavenging to low-output scavenging, scavenging is stopped at an appropriate timing when moderate removal of moisture in the fuel cell 10 is just completed. A combination of high power scavenging and low power scavenging operating times is defined.

  For example, when the time during which the compressor 24 operates at high rotation (high power scavenging) (scale on the vertical axis) is t1, the control device 4 performs low rotation based on the position of the point P1 on the map corresponding to t1. The operating time (scale on the horizontal axis) at (low output scavenging) is set to T1. And the control apparatus 4 sets the 1st operation | movement pattern shown as a continuous line on FIG. 3 based on the combination of t1 and T1. Similarly, for example, when the operation time (scale on the vertical axis) at high rotation (high output scavenging) is t2, the control device 4 performs low rotation (low speed) based on the position of the point P2 on the map of FIG. The operation time at the output scavenging) is set to T2, and the second operation pattern indicated by the broken line in FIG. 3 is set.

  In the present embodiment, when the control device 4 that has received a signal from the open / close sensor starts operating with high output of the scavenging means, the open / close state of the door 50 shifts to the open state and the scavenging means has low output. The elapsed time (operation time at high output) up to the point of time when switching to is calculated, and the operation of the scavenging means after switching to low output scavenging using the calculated operation time and the map of FIG. Set the time appropriately. The control device 4 can set an operation pattern corresponding to each point on the map of FIG.

  In addition to the output of the scavenging means, the time required for the removal of the water in the fuel cell 10 by the operation of the scavenging means is not limited to the amount of water accumulated in the fuel cell 10, the temperature condition in the fuel cell 10, and the outside air. It also varies depending on conditions or various conditions such as the travel time of the fuel cell vehicle 100. Therefore, if the control device 4 has different maps corresponding to such various conditions as control data in advance, an appropriate map is selected according to the situation and the operation time of the scavenging means is set more appropriately. It becomes possible to do. For example, it is possible to select the most appropriate map based on the current temperature condition based on the output of the temperature sensor or the like, thereby performing the optimum scavenging control.

  Next, scavenging control after the operation of the fuel cell system 1 according to the present embodiment is stopped will be described using the flowchart of FIG.

  During normal operation of the fuel cell system 1, hydrogen gas is supplied from the hydrogen tank 30 to the fuel electrode of the fuel cell 10 through the hydrogen supply channel 31, and the air that has been subjected to humidification adjustment passes through the air supply channel 21. Is supplied to the oxidation electrode of the fuel cell 10 to generate power. At this time, the power (required power) to be drawn from the fuel cell 10 is calculated by the control device 4, and hydrogen gas and air in an amount corresponding to the amount of power generation are supplied into the fuel cell 10. During normal operation, the fuel cell 10 is in a wet state, so that when the operation is stopped, moisture remains in the fuel cell 10. In the present embodiment, “scavenging” for discharging the moisture in the fuel cell 10 to the outside is performed after the normal operation is stopped.

  First, the control device 4 determines the presence or absence of an operation stop signal due to an ignition switch OFF operation or the like (operation stop determination step: S1). Then, when detecting the operation stop signal (S1: YES), the control device 4 determines whether or not the opening degree of the door 50 is 0 based on the output from the open / close sensor of the fuel cell 10 (door open). Degree determination step: S2). For example, when an encoder is provided as an open / close sensor, the opening degree of the door 50 is determined based on a pulse signal from the encoder. On the other hand, if the operation stop signal is not detected (S1: NO), the control device 4 ends the process.

  When determining that the opening degree of the door 50 is 0 in the door opening degree determination step S2 (S2: YES), the control device 4 operates the scavenging means at a high output for a predetermined time (high output scavenging step: S3). That is, the compressor 24 is driven at a predetermined number of revolutions (high revolution), and the shutoff valve 33 and the regulator 34 are driven and controlled in accordance therewith to supply gas (oxidizing gas and hydrogen gas) into the fuel cell 10. As a result, the water remaining in the fuel cell 10 is discharged to the outside. When performing such a high-output scavenging step S3, the control device 4 keeps the exhaust drain valve 36 open, and the moisture discharged from the fuel cell 10 to the air discharge channel 22 and the circulation channel 32 is discharged to the exhaust channel 23. Then, the fuel is discharged to the outside of the fuel cell vehicle 100 through the discharge passage 37 and the discharge pipe 39.

  Following the high-power scavenging step S3, the control device 4 has passed the maximum scavenging duration at high output (the scale t0 on the vertical axis at the intersection of the map and the vertical axis in FIG. 4) based on the map of FIG. (High output scavenging time determination step: S4). When the control device 4 determines that the maximum operation duration has not yet elapsed (S4: NO), the control device 4 returns to the door opening determination step S2 and continues the process. On the other hand, if the control device 4 determines that the maximum operation duration has already elapsed (S4: YES), the control device 4 ends the process.

  On the other hand, when determining that the opening degree of the door 50 is not 0 in the door opening degree determination step S2 (S2: NO), the control device 4 and the high output scavenging step S3 up to the present time are shown. Based on the duration, the operation time of the scavenging means after switching from high output scavenging to low output scavenging is set (low output scavenging time setting step: S5).

  Following the low output scavenging time setting step S5, the control device 4 switches the scavenging means to low output and operates it for a predetermined time (low output scavenging step: S6). That is, the compressor 24 is driven at a predetermined rotation speed (low rotation), and the shut-off valve 33 and the regulator 34 are driven and controlled in accordance with this to supply gas (oxidizing gas and hydrogen gas) into the fuel cell 10. As a result, the water remaining in the fuel cell 10 is discharged to the outside. The operating sound in the low output scavenging step S6 is relatively reduced than the operating sound in the high output scavenging step S3.

  Following the low output scavenging step S6, the control device 4 determines whether or not the operation time set in the low output operation time setting step S5 has already elapsed (low output scavenging time determination step: S7). Then, when it is determined that the set operation time has not yet elapsed (S7: NO), the control device 4 returns to the low output scavenging step S6 and continues the process. On the other hand, when it is determined that the operation time set in the low output scavenging time setting step S5 has already elapsed (S7: YES), the control device 4 ends the process.

  In the scavenging operation described above, the map shown in FIG. 4 referred to as control data is based on the amount of water accumulated in the fuel cell 10, the temperature condition in the fuel cell 10, the outside air condition, or the travel time of the fuel cell vehicle 100. You may select based on various conditions, such as. In this case, a process for selecting a map may be performed based on signals from a moisture sensor, a temperature sensor, a travel meter, and the like.

  In the fuel cell system 1 according to the embodiment described above, the moisture in the fuel cell 10 is discharged to the outside according to the open / closed state of the door 50 (opening / closing part) provided in the fuel cell vehicle 100 (moving body). For adjusting the output of the scavenging means (compressor 24, shut-off valve 33, regulator 34, and control device 4) (the number of revolutions of the compressor 24, etc.) during operation, thereby adjusting the operating sound of the scavenging means Can do. Therefore, scavenging can be performed with an appropriate operating sound according to whether the operating sound inside the fuel cell vehicle 100 or the operating sound outside the fuel cell is felt, and noise that makes the passenger uncomfortable is suppressed. can do. In particular, when the door 50 is in the open state, the occupant opens the door 50 of the fuel cell vehicle 100 by controlling the scavenging means so that the operating noise is reduced compared to when the door 50 is in the closed state. Discomfort caused by noise when going outside can be reduced.

  Further, in the fuel cell system 1 according to the embodiment described above, the control device 4 (scavenging control means) indicates that the fuel cell 10 is in the operation stop state and the door 50 is shifted from the closed state to the open state. As a condition, the operating state of the scavenging means can be switched from the high operating sound state to the low operating sound state. As a result, the noise felt by the occupant when the fuel cell 10 is stopped and the door 50 is opened can be reduced, and occupant discomfort can be reduced. In addition, since the scavenging means can be operated in a high operating sound state until the door 50 is opened, the operation time of the scavenging means after the fuel cell 10 is stopped can be shortened.

  In the fuel cell system 1 according to the embodiment described above, the control device 4 (scavenging control means) is subjected to various conditions such as the amount of water in the fuel cell 10, the temperature environment, and the travel time of the fuel cell vehicle 100. It has a map (control data) associated with it, and based on this map, it is possible to set the combination of the operating time in the high operating sound state and the operating time in the low operating sound state of the scavenging means. As a result, in consideration of the current situation of the fuel cell system 1, a more appropriate operation pattern of the scavenging means can be set. In particular, by controlling based on such a map, it is possible to prevent the scavenging means from being operated unnecessarily for a long time, and to prevent energy from being wasted, and to reduce dry-up in the fuel cell 10 (insufficient water in the electrolyte membrane). Occurrence can be suppressed.

  In the above embodiment, an example is shown in which the operating sound during scavenging is adjusted according to the open / closed state of the door for getting on and off provided on the moving body. The operating sound may be adjusted. In this way, discomfort due to noise heard from outside the vehicle when the window is opened can be reduced. The window in such a case corresponds to an embodiment of the opening / closing part in the present invention.

  Moreover, in the above embodiment, switching from high output scavenging (high operating sound state) to low output scavenging (low operating sound state) is performed only at the time of transition from the closed state of the door or the like to the open state. After switching, it was operating with low output scavenging (low operation sound state) until scavenging was completed, but if the passenger closed the door while the passenger was still inside the low output scavenging, the high output scavenging was performed again. You may make it switch to (high operating sound state). In this way, it is possible to further shorten the operating time of the scavenging means.

  In the above embodiment, the scavenging control is performed after the normal operation of the fuel cell 10 is stopped. However, the scavenging control according to the open / close state of the opening / closing unit is performed when the purge operation is performed during the normal operation. Can also be implemented. In such a case, the control device 4 performs a purge determination step of determining whether it is time to execute the purge operation, instead of the operation stop determination step S1 in the flowchart of FIG. And the control apparatus 4 performs door opening determination process S2 which determines the opening of the door 50, when it determines with it is time to perform purge operation. The processes after the door opening degree determination step S2 are the same as those in the above embodiment.

  In the above embodiment, an example in which the opening / closing state of the door 50 is determined by determining whether the opening degree of the door 50 is 0 based on the output from the opening / closing sensor provided in the fuel cell 10. However, instead of directly detecting the opening degree of the door 50 by the open / close sensor, the open / close state of the door 50 may be determined based on a drive command signal of the door open / close device or a signal from the operation unit. . For example, when the drive signal of the door drive motor or the operation signal of the door remote controller is detected, the operating state of the scavenging means may be switched from high output scavenging to low output scavenging. In this way, it is not necessary to provide an open / close sensor.

  Moreover, in the above embodiment, although the example which mounted the fuel cell system which concerns on this invention in the fuel cell vehicle was shown, it concerns on this invention to various mobile bodies (a robot, a ship, an aircraft, etc.) other than a fuel cell vehicle. A fuel cell system can also be installed.

1 is a configuration diagram of a fuel cell system according to an embodiment of the present invention. It is a block diagram of the fuel cell vehicle carrying the fuel cell system shown in FIG. It is a conceptual diagram which shows the operation pattern of the scavenging means of the fuel cell system shown in FIG. It is a map showing the combination of the operation time in high rotation, and the operation time in low rotation for setting the operation pattern shown in FIG. 2 is a flowchart for explaining a scavenging operation after the operation of the fuel cell system shown in FIG. 1 is stopped.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 1 ... Fuel cell system, 4 ... Control apparatus (a part of scavenging means, scavenging control means), 10 ... Fuel cell, 24 ... Compressor (a part of scavenging means), 33 ... Shut-off valve (a part of scavenging means), 34 ... Regulator (part of scavenging means), 50 ... Door (opening / closing part), 100 ... Fuel cell vehicle (moving body).

Claims (9)

In a fuel cell system comprising: a fuel cell disposed on a moving body; and a scavenging means for discharging moisture in the fuel cell to the outside.
Scavenging control means for controlling the scavenging means to operate with an operating sound corresponding to the open / closed state of the open / close section provided in the moving body,
Fuel cell system. The scavenging control means controls the scavenging means so that the operation sound is reduced when the opening / closing part is in an open state, compared to when the opening / closing part is in a closed state,
The fuel cell system according to claim 1. The scavenging control means changes the operating state of the scavenging means from a high operating sound state to a low operating sound state when the fuel cell is in an operation stop state and the opening / closing part shifts from a closed state to an open state. To switch,
The fuel cell system according to claim 1. The scavenging control means has control data associated with the state of the moving body or the state of the fuel cell, and based on the control data, the operation time in the high operating sound state of the scavenging means and the low Set the operating time in the operating sound state,
The fuel cell system according to claim 3. The opening / closing part has a door for getting on and off the moving body,
The fuel cell system according to any one of claims 1 to 4. In a control method for a fuel cell system, comprising: a fuel cell disposed on a moving body; and a scavenging means for discharging moisture in the fuel cell to the outside.
A first step of determining an open / close state of an open / close section provided in the movable body;
A second step of operating the scavenging means with an operating sound corresponding to the open / closed state determined in the first step,
Control method of fuel cell system. In the second step, when the opening / closing part is in an open state, the scavenging means is operated so that an operating noise is reduced as compared with a case where the opening / closing part is in a closed state;
The control method of the fuel cell system according to claim 6. In the first step, it is determined whether or not the fuel cell is in an operation stopped state and the opening / closing part has shifted from a closed state to an open state;
In the second step, the scavenging means is activated when it is determined in the first step that the fuel cell is in a stopped state and the opening / closing part has shifted from a closed state to an open state. Switching the state from a high operating sound state to a low operating sound state,
The control method of the fuel cell system according to claim 6. In the second step, based on the control data associated with the state of the moving body or the state of the fuel cell, the operation time of the scavenging means in the high operating sound state and the low operating sound state Set the operating time,
The method for controlling a fuel cell system according to claim 8.

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