JP2006185616A - Fuel cell system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a fuel cell system having a water exhausting valve controlling the amount of water exhausted from a water tank within the prescribed time so as to reach the prescribed amounts. <P>SOLUTION: In the fuel cell system having a fuel cell 1 mounted on a vehicle, when part of water in the water tank 7 is exhausted from the exhausting valve 12, the water exhausting valve 12 is controlled by varying the opening-closing cycle and the opening time of the water exhausting valve 12, based on the operation state of a fuel cell vehicle. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a fuel cell system, and more particularly to a method for discharging generated water to the outside.

Japanese Patent Application Laid-Open No. H10-228667 discloses a conventional storage unit that stores generated water generated during power generation of a fuel cell and controls the drainage so that the water level of the storage unit falls within a predetermined range.
JP 2002-313403 A

  However, in the above invention, the generated water is discharged regardless of the driving state of the vehicle, so that a large amount of water is discharged at a time as compared with the drainage pattern from the conventional vehicle, for example, the drainage pattern from the vehicle by using an air conditioner. There is a possibility that the driver may feel uncomfortable.

  The present invention has been invented to solve such problems, and adjusts the drainage control cycle of the generated water storage section and the drain valve closing time according to the operating state of the fuel cell system, so that the driver, etc. It aims at discharging a part of the water of the generated water storage part to the outside without giving a sense of incongruity.

  In the present invention, a fuel cell that is mounted on a vehicle and generates power by an electrochemical reaction between a fuel gas and an oxidant gas, a humidifying means for humidifying the fuel gas or the oxidant gas, and generated water generated by the electrochemical reaction A fuel cell system comprising: a generated water storage unit that stores and supplies generated water to a humidifying means; and a discharge valve that discharges water from the generated water storage unit. Discharge valve control means for changing the open / close cycle and open time is provided.

  According to the present invention, by controlling the amount of water discharged from the generated water storage portion and the opening and closing cycle of the drain valve when the drain valve is opened once, the amount of water discharged within a certain time can be made constant, A part of the water can be discharged from the generated water storage unit without causing the driver to feel uncomfortable.

  A schematic configuration of a fuel cell system according to a first embodiment of the present invention will be described with reference to FIG. In this embodiment, a fuel cell 1 including an anode 2 and a cathode 3, a hydrogen cylinder 4 for supplying hydrogen (fuel gas) to the anode 2, a compressor 5 for supplying air (oxidant gas) to the cathode 3, a cathode 3 is provided with a humidifier (humidifying means) 6 for humidifying the air to be supplied to 3, and a water tank (product water storage unit) 7 for storing water to be humidified with the humidifier 6.

  Hydrogen is supplied to the anode 2 from the hydrogen cylinder 4 via the hydrogen supply path 20, and hydrogen not used in the fuel cell 1 is discharged to the outside of the anode 2 via the hydrogen discharge path 21. The hydrogen discharge passage 21 includes a pressure adjustment valve 9 that adjusts the pressure of the anode 2. Note that the hydrogen discharged from the fuel cell 1 may be supplied to the fuel cell 1 again.

  Air that has been humidified by the humidifier 6 from the compressor 5 is supplied to the cathode 3 via the air supply path 22, and oxygen-containing air that has not been used in the fuel cell 1 is discharged to the outside via the air discharge path 23. Is done. The air discharge path 23 includes a pressure adjustment valve 10 that adjusts the pressure of the cathode 3. In this embodiment, air is humidified by the humidifier 6, but hydrogen supplied to the anode 2 may be humidified.

  The water tank 7 is connected to the generated water recovery path 24, and the water generated by the fuel cell 1 is recovered and stored in the water tank 7. The water stored in the water tank 7 is supplied by the water pump 11 to the humidifier 6 through the humidified water supply path 25, and the air supplied to the cathode 3 is humidified by the humidifier 6. The water tank 7 is connected to a water discharge path 26 for discharging water in the water tank 7, and the water discharge path 26 includes a drain valve 12.

  Further, a wiper operation sensor 27 that detects whether or not the wiper is operating from a wiper switch signal, an airspeed detection sensor (airspeed detection means) 28 that detects the airspeed of the vehicle, and the fuel cell 1. An operating pressure detecting sensor (operating pressure detecting means) 29 for detecting the operating pressure of the fuel cell 1, an operating temperature detecting sensor (operating temperature detecting means) 30 for detecting the operating temperature of the fuel cell 1, and a generated current of the fuel cell 1 are detected. A generated current detection sensor (generated current detection means) 31 is provided.

  A wiper operation sensor 27, an airspeed detection sensor 28, an operating pressure detection sensor 29, and a controller (drainage valve control means) 50 that controls the drainage valve 12 from the operating temperature detection sensor 30 are provided.

  Next, the control operation of the drain valve 12 by the controller 50 will be described using the flowchart of FIG.

  In step S100, the generated current of the fuel cell 1 is detected from the generated current detection sensor 31. Further, the operating pressure of the fuel cell 1 is detected from the operating pressure detection sensor 29, and the operating temperature of the fuel cell 1 is detected from the operating temperature detection sensor 30. Since the amount of water generated by the power generation reaction of the fuel cell 1 is determined by the amount of power generation reaction of the fuel cell 1, the amount of water generated can be detected by detecting the power generation current of the fuel cell 1. Further, part of the generated water is condensed to become a liquid and recovered from the generated water recovery path 24 to the water tank 7, and the remaining generated water is discharged as a gas to the outside of the fuel cell 1. The amount of generated water to be condensed varies depending on the operating pressure and operating temperature of the fuel cell 1. Therefore, the amount of generated water collected in the water tank 7 is estimated by a map set in advance from the generated current, the operating pressure, and the operating temperature of the fuel cell 1, and the generated water storage speed v2 is calculated (Step S100 estimates the storage speed). Means).

In step S101, when the generated water storage speed is slow, the open / close cycle T2 corresponding to the generated water storage speed v2 calculated in step S100 is the lowest. Here, the power generation current and the operating pressure of the fuel cell 1 are the smallest and the fuel cell 1 From the basic generated water storage speed v1 at the highest operating temperature and the opening / closing cycle T1 of the drain valve 12,
T2 = (v1 / v2) × T1 Formula (1)
Calculated by The opening / closing cycle T1 (predetermined time) is a preset opening / closing cycle T1, and the opening time of the drain valve 12 in this case is t1.

  Accordingly, the open / close cycle of the drain valve 12 can be changed according to the generated water storage speed of the fuel cell 1, the water level in the water tank 7 can be maintained at an appropriate water level, and the water level of the water tank 7 is the upper limit water level. Can not be exceeded. When the generated water storage speed increases, the opening / closing cycle becomes shorter. The opening time corresponding to the opening / closing cycle T2 of the drain valve 12 is set to t2 (this opening time t2 and the opening / closing cycle are set to the drainage pattern 1). Here, although the opening / closing cycle is changed by the generated water storage speed of the fuel cell 1, the opening time t2 and the opening time t1 are the same time because the opening time is not changed.

  In step S102, the wiper operation sensor 27 determines whether the wiper is operating. If the wiper is not operating, it is determined that the vehicle is not driving in rainy weather, and the process proceeds to step S103. When the wiper is not operating, the drain valve 12 is controlled at the opening / closing cycle T2 and the opening time t2 set in step S101. Since the water in the water tank 7 can be discharged without giving the driver a sense of incongruity during rainy weather, the opening / closing cycle and opening time of the drain valve 12 are set without proceeding to step S103. In addition, you may judge whether it is driving | running | working on rainy weather with the raindrop sensor etc. instead of the wiper operation sensor 27 (step S102 comprises a weather determination means).

In step S103, the open / close cycle T2 and the open time t2 of the drain valve 12, which is the drain pattern 1 when the airspeed is zero, are read. Then, the airspeed V of the vehicle is detected by the airspeed sensor 28, and the opening time t3 of the drain valve 12 corresponding to the current airspeed V is read by a map or the like set in advance according to the airspeed. The opening time t3 is the opening time t2 when the airspeed is zero, and is a value calculated from the map when the airspeed is not zero. Furthermore, the opening period T3 of the drain valve 12 is changed from the opening times t2, t3 and the opening / closing period T2 so that the amount of drainage discharged from the drain valve 12 during a predetermined time period is constant regardless of the air speed.
T3 = (t3 / t2) × T2
= (T3 / t2) × (v1 / v2) × T1 Formula (2)
The drainage pattern 2 (opening / closing cycle T3, opening time t3) is set. The opening time t3 becomes shorter as the airspeed V increases. That is, the opening period T3 is also shortened as the airspeed V increases.

  With the above control, the opening time t3 and the opening cycle T3 of the drain valve 12 can be calculated according to the airspeed of the vehicle, the water level in the water tank 7 is kept at an appropriate level, and the drain valve is within a predetermined time. The amount of drainage discharged from 12 can be made constant.

  Here, an example of the change from the drainage pattern 1 to the drainage pattern 2 due to the airspeed will be described with reference to FIG. (A) is an opening / closing operation of the drainage valve 12 of the drainage pattern 1, (b) is an opening / closing operation of the drainage valve 12 when the opening time is t3, and (c) is a drainage valve when the drainage pattern 2 is used. 12 open / close operations. Here, the opening time t3 is set to ½ of the opening time t2.

  In the case of the drainage pattern 1, the opening / closing cycle of the drainage valve 12 is T2 (s1 to s5), and the opening time is t2 (s1 to s3). And the open time t3 (s1-s2) according to the airspeed V is read. Further, the opening / closing cycle T3 (s1 to s3) is calculated by the equation (2), and the opening / closing cycle is shortened according to the opening time t3, that is, according to the airspeed V. The amount of drainage discharged from the drainage valve 12 is indicated by a hatched portion in FIG. 3. In the drainage pattern 1 and the drainage pattern 2, the amount of drainage discharged from the drainage valve 12 is constant within a certain time (predetermined time) until time s5. Amount (predetermined amount).

  In this embodiment, the air speed is detected. However, the vehicle speed detected from a vehicle speed detection sensor normally provided in the vehicle may be used instead of the air speed. Accordingly, the drainage pattern 2 can be calculated without using the airspeed detection sensor 28.

  Further, in this embodiment, the generated water storage speed in the water tank 7 is calculated according to the operating state of the fuel cell 1. However, as shown in FIG. 4, the water tank 7 is provided with a water level sensor (water level detection means) 32. The drainage pattern 1 (opening / closing cycle T2) of the drainage valve 12 may be set by the change in the water level detected by 32. This makes it possible to accurately detect a change in the water level, that is, the generated water storage speed.

  The effect of 1st Embodiment of this invention is demonstrated.

  In this embodiment, the drainage pattern 1 (opening / closing cycle T2) of the drainage valve 12 of the water tank 7 is calculated according to the operating state of the fuel cell 1 (power generation current, operating pressure, operating temperature of the fuel cell 1), and the vehicle The drainage pattern 2 (opening / closing cycle T3, opening time t3) is calculated according to the airspeed, and the opening / closing cycle and opening time of the drainage valve 12 are controlled. As a result, the amount of discharged water (opening time) and the opening / closing cycle are changed according to the airspeed, but the amount of discharged water discharged from the drain valve 12 within a predetermined time is constant. Can be. Therefore, a part of the water in the water tank 7 can be discharged from the drain valve 12 to the outside without causing the driver to feel uncomfortable, and the water level of the water tank 7 can be kept at an appropriate level.

  When the generated water storage speed generated by the fuel cell 1 is increased, it is possible to keep the water level of the water tank 7 at an appropriate level and not to exceed the upper limit level by shortening the opening / closing cycle of the drain valve 12. .

  By reducing the amount of discharged water when the airspeed increases, it is possible to prevent a driver from feeling uncomfortable without discharging a large amount of water at a time during high-speed driving, for example. Further, for example, when the opening time of the drain valve 12 is shortened, the opening / closing cycle of the drain valve 12 is shortened and the opening / closing cycle is set according to the opening time, so that the discharge discharged from the water tank 7 per predetermined time The amount of water can be kept constant.

  When running in rainy weather, the opening / closing cycle is changed according to the generated water storage speed without changing (shortening) the opening / closing cycle and opening time of the drain valve 12 according to the air speed. Since it can be discharged from the water tank 7 without making the driver feel uncomfortable when it rains, the water level of the water tank 7 can be kept at an appropriate level, the number of times the drain valve 12 can be opened and closed, and the drain valve 12 is deteriorated. Can be suppressed.

  Next, the schematic configuration of the fuel cell system according to the second embodiment of the present invention will be described with reference to FIG. In this embodiment, instead of the air speed detection sensor 28 of the first embodiment, a pressure sensor (product water storage part pressure detection means) 33 for detecting the pressure in the water tank 7 and water located downstream of the drain valve 12 are used. A pressure sensor (drain valve outlet pressure detection means) 34 for detecting the pressure at the outlet of the drain valve is provided in the discharge path 26. With this configuration, the opening / closing cycle and opening time of the drain valve 12 are set. Since other configurations are the same as those in the first embodiment, description thereof is omitted here.

  Next, the control operation of the drain valve 12 by the controller 50 will be described using the flowchart of FIG.

  Since the control from step S200 to step S202 is the same as the control from step S100 to S102 of the first embodiment, a description thereof is omitted here.

  In step S203, the opening / closing cycle T2 and the opening time t2 of the drainage valve 12 which is the drainage pattern 3 when the pressure difference between the pressure in the water tank 7 and the pressure at the drainage valve outlet is the minimum are read. The pressure sensor 33 and the pressure sensor 34 detect the pressure in the water tank 7 and the pressure at the outlet of the drain valve, and calculate the differential pressure dP.

  The pressure of the fuel cell 1 is controlled by adjusting the pressure regulating valve 10 based on the operating state of the fuel cell 1. Since the fuel cell 1 and the water tank 7 communicate with each other via the generated water recovery path 24, the pressure in the water tank 7 varies depending on the pressure of the fuel cell 1, that is, the operating state of the fuel cell 1. The water discharge path 26 communicates with the outside, and the pressure at the outlet of the drain valve varies depending on the atmospheric condition outside the water discharge path 26, that is, the external atmospheric pressure and the vehicle speed of the vehicle. Therefore, the amount of drainage discharged from the water tank 7 varies depending on the pressure in the water tank 7 and the pressure outside the water discharge path 26.

In step S203, the opening time t4 of the drain valve 12 corresponding to the differential pressure dP is read using a preset map or the like. Furthermore, the opening period T4 of the drain valve 12 is changed from the opening times t2, t4 and the opening / closing period T2 so that the amount of drainage discharged from the drain valve 12 during a predetermined time is constant regardless of the air speed.
T4 = (t4 / t2) × T2
= (T4 / t2) × (v1 / v2) × T1 Formula (3)
The drainage pattern 3 (opening / closing cycle T4, opening time t4) is set. The opening time t4 becomes shorter as the differential pressure dP increases.

  Here, an example of the change from the drainage pattern 1 to the drainage pattern 3 by the differential pressure dP will be described with reference to FIG. (A) is an opening / closing operation of the drainage valve 12 of the drainage pattern 1, (b) is an opening / closing operation of the drainage valve 12 when the opening time is t4, and (c) is a drainage valve when the drainage pattern 3 is used. 12 open / close operations. Here, the opening time t4 is set to ½ of the opening time t2.

  When the differential pressure dP is minimum, the opening / closing cycle of the drain valve 12 is T2 (s1 to s5), and the opening time is t4 (s1 to s3). And the open time t4 (s1-s2) according to the differential pressure dP is read. Further, the opening / closing cycle T4 (s1 to s3) is calculated by the equation (3), and the opening / closing cycle is shortened according to the opening time t4, that is, the differential pressure dP. The amount of drainage discharged from the drainage valve 12 is indicated by hatched portions in FIG. 7. In the drainage pattern 1 and the drainage pattern 3, the amount of drainage drained from the drainage valve 12 within a certain period of time up to time s 5 is constant.

  With the above control, the opening time t4 and the opening cycle T4 of the drain valve 12 can be calculated according to the differential pressure dP between the pressure in the water tank 7 and the pressure at the outlet of the drain valve, and the water level in the water tank 7 is set appropriately. The amount of drainage discharged from the drainage valve 12 within a predetermined time can be kept constant while maintaining the water level.

  In this embodiment, the pressure in the water tank 7 is detected by the pressure sensor 33, but the differential pressure dP may be detected based on the pressure detected by the operating pressure detection sensor 29. In this case, the pressure in the water tank 7 is calculated from the pressure detected by the operating pressure detection sensor 29 using a preset map or the like. As a result, the differential pressure dP can be calculated without providing the pressure sensor 33 in the water tank 7.

  The effect of 2nd Embodiment of this invention is demonstrated.

  Also in this embodiment, the amount of discharged water discharged from the drain valve 12 can be controlled according to the operating state of the fuel cell 1 as in the first embodiment, and the water level in the water tank 7 is kept at an appropriate water level. be able to.

  Next, the schematic configuration of the fuel cell system according to the third embodiment of the present invention will be described with reference to FIG. In this embodiment, in addition to the air speed detection sensor 28 of the first embodiment, the pressure sensor 33 for detecting the pressure in the water tank 7 and the pressure at the outlet of the drain valve in the water discharge path 26 located downstream of the drain valve 12. Is provided. With this configuration, the opening / closing cycle and opening time of the drain valve 12 are set. Since other configurations are the same as those in the first embodiment, description thereof is omitted here.

  Next, the control operation of the drain valve 12 by the controller 50 will be described using the flowchart of FIG.

  Since the control from step S300 to step S303 is the same as that from step S100 to S103 of the first embodiment, a description thereof is omitted here.

  In step S304, the opening / closing period T3 and the opening time t3 of the drainage valve 12, which is the drainage pattern 3 when the pressure difference between the pressure in the water tank 7 and the pressure at the outlet of the drainage valve is the minimum, are read. The pressure sensor 33 and the pressure sensor 34 detect the pressure in the water tank 7 and the pressure at the outlet of the drain valve, and calculate the differential pressure dP.

  The pressure of the fuel cell 1 is controlled by the pressure adjustment valve 10 according to the operating state of the fuel cell 1. Since the fuel cell 1 and the water tank 7 communicate with each other via the generated water recovery path 24, the pressure in the water tank 7 varies depending on the pressure of the fuel cell 1, that is, the operating state of the fuel cell 1. The water discharge path 26 communicates with the outside, and the pressure at the outlet of the drain valve varies depending on the atmospheric condition outside the water discharge path 26, that is, the external atmospheric pressure and the vehicle speed of the vehicle. Therefore, the amount of drainage discharged from the water tank 7 varies depending on the pressure in the water tank 7 and the pressure outside the water discharge path 26.

In step S304, the opening time t5 of the drain valve 12 corresponding to the differential pressure dP is read from a preset map or the like. From the opening time t4 calculated in step S303, the opening time t6 of the drain valve 12 is
t6 = (t5 / t2) × t4 Formula (4)
To calculate. Further, the opening period T6 of the drain valve 12 is changed from the opening times t4 and t6 and the opening / closing period T4 so that the amount of drainage discharged from the drain valve 12 during a predetermined time is constant regardless of the air speed.
T6 = (t5 / t4) × T4
= (T6 / t4) x (t4 / t2) x (v1 / v2) x T1 Equation (5)
The drainage pattern 4 (opening / closing cycle T6, opening time t6) is set. The opening time t6 becomes shorter as the differential pressure dP increases.

  Here, an example of the change from the drainage pattern 1 to the drainage pattern 4 will be described with reference to FIG. (A) is an opening / closing operation of the drain valve 12 of the drain pattern 1, (b) is an opening / closing operation of the drain valve 12 of the drain pattern 2, and (c) is an opening / closing operation of the drain valve 12 of the drain pattern 3. . Here, it is assumed that the opening time t4 is ½ of the opening time t2, and the opening time t6 is ½ of t4.

  In the case of the drainage pattern 1, the opening / closing cycle of the drainage valve 12 is T2 (s1 to s9), and the opening time is t2 (s1 to s5). When the drainage pattern is changed to the drainage pattern 2 according to the airspeed V, the opening / closing cycle of the drainage valve 12 is T4 (s1 to s5), and the opening time is t4 (s1 to s3). Further, when the drainage pattern is changed to the drainage pattern 4 according to the differential pressure dP, the opening / closing cycle of the drainage valve 12 is T6 (s1 to s3), and the opening time is t6 (s1 to s2). The amount of drainage discharged from the drainage valve 12 is indicated by the hatched portion in FIG. 10. In the drainage pattern 1, the drainage pattern 3, and the drainage pattern 4, the amount of drainage discharged from the drainage valve 12 is constant within a certain time period up to time s9. Amount.

  By the above control, the opening time t6 and the opening cycle T6 of the drain valve 12 can be calculated according to the air pressure V of the vehicle, the pressure dP between the pressure in the water tank 7 and the outlet pressure of the drain valve 12, and the water The water level in the tank 7 can be kept at an appropriate level, and the amount of drainage discharged from the drain valve 12 within a predetermined time can be made constant.

  The effect of the third embodiment of the present invention will be described.

  Also in this embodiment, the amount of discharged water discharged from the drain valve 12 can be controlled according to the operating state of the fuel cell 1 as in the first embodiment, and the water level in the water tank 7 is kept at an appropriate water level. be able to.

  Since the opening / closing period and opening time of the drain valve 12 are set by the air pressure V of the vehicle, the differential pressure dP between the pressure in the water tank 7 and the outlet pressure of the drain valve 12, the amount of discharged water discharged from the drain valve 12 at a time Can be controlled more accurately.

  It goes without saying that the present invention is not limited to the above-described embodiments, and includes various modifications and improvements that can be made within the scope of the technical idea.

  It can be used for a vehicle equipped with a fuel cell.

1 is a diagram showing a schematic configuration of a fuel cell system according to a first embodiment of the present invention. It is a flowchart which shows control operation | movement of the drain valve of 1st Embodiment of this invention. It is a figure which shows the drainage pattern of 1st Embodiment of this invention. It is a figure which shows the example of a change of 1st Embodiment of this invention. It is a figure which shows the fuel cell system schematic structure of 2nd Embodiment of this invention. It is a flowchart which shows the control action of the drain valve of 2nd Embodiment of this invention. It is a figure which shows the drainage pattern of 2nd Embodiment of this invention. It is a figure which shows the fuel cell system schematic structure of 3rd Embodiment of this invention. It is a flowchart which shows the control action of the drain valve of 3rd Embodiment of this invention. It is a figure which shows the drainage pattern of 3rd Embodiment of this invention.

Explanation of symbols

1 Fuel cell 6 Humidifier (humidification means)
7 Water tank (product water storage part)
12 Drain valve 27 Wiper operation sensor 28 Air speed detection sensor (air speed detection means)
29 Operating pressure detection sensor (Operating pressure detection means)
30 Operating temperature detection sensor (Operating temperature detection means)
31 Generated current detection sensor (generated current detection means)
32 Water level sensor (water level detection means)
33 Pressure sensor (product water storage part pressure detection means)
34 Pressure sensor (Drain valve outlet pressure detection means)
50 Controller (Drain valve control means)

Claims (11)

A fuel cell mounted on a vehicle and generating power by an electrochemical reaction between a fuel gas and an oxidant gas;
Humidifying means for humidifying the fuel gas or the oxidant gas;
A generated water storage section for storing the generated water generated by the electrochemical reaction and supplying the generated water to the humidifying means;
In a fuel cell system comprising a discharge valve for discharging water from the generated water storage unit,
A fuel cell system comprising: a discharge valve control means for changing an opening / closing cycle and an opening time of the discharge valve based on an operating state of the fuel cell vehicle.   2. The fuel cell according to claim 1, wherein the discharge valve control means changes the open / close cycle and the open time so that an amount of water discharged from the discharge valve within a predetermined time becomes a predetermined amount. system. An air speed detecting means for detecting the air speed of the vehicle,
3. The fuel cell system according to claim 1, wherein the discharge valve control unit shortens the opening / closing cycle and the opening time as the airspeed increases. 4. Vehicle speed detecting means for detecting the vehicle speed of the vehicle,
The fuel cell system according to claim 1 or 2, wherein the discharge valve control means shortens the opening / closing cycle and the opening time as the vehicle speed increases. A generated water storage section pressure detection means for detecting the pressure of the generated water storage section;
A drain valve outlet pressure detecting means for detecting the pressure of the outlet of the drain valve,
The said discharge valve control means shortens the said opening-and-closing period and the said open time, so that the pressure difference of the pressure of the said produced | generated water storage part and the pressure of the outlet of the said drain valve is large. The fuel cell system according to any one of the above. Comprising an operating pressure detecting means for detecting an operating pressure inside the fuel cell;
The fuel cell system according to claim 5, wherein the generated water storage unit pressure detection unit estimates the pressure of the generated water storage unit based on the operating pressure. Equipped with weather judgment means to judge whether the weather is rainy or not,
7. The fuel cell system according to claim 2, wherein the opening / closing cycle and the opening time are not shortened when the weather is rainy.   The fuel cell system according to claim 7, wherein the weather determination unit determines the operation based on an operation of a wiper of the vehicle. A storage speed estimating means for estimating a storage speed of the generated water stored in the generated water storage section;
The fuel cell system according to any one of claims 1 to 8, wherein the discharge valve control means shortens the opening and closing cycle as the storage speed increases. The storage speed estimation means includes
Generated current detection means for detecting the generated current of the fuel cell;
An operating pressure detecting means for detecting an operating pressure inside the fuel cell;
An operating temperature detecting means for detecting an operating temperature of the fuel cell,
The fuel cell system according to claim 9, wherein the storage speed is estimated from the generated current, the operating pressure, and the operating temperature. The storage speed estimation means includes
Comprising water level detection means for detecting the water level of the generated water reservoir,
The fuel cell system according to claim 9, wherein the storage speed is estimated from an increase rate of the water level.

Images