JP2019029129A - Sealing valve control system and fuel cell system - Google Patents

Abstract

To provide a sealing valve control system and a fuel cell system capable of preventing gas from leaking in a fully closed sealing valve.SOLUTION: In a sealing valve control system according to an embodiment, an inlet sealing valve 174 is provided with a rubber seal portion 13a for sealing a gap between a valve body 14 and a valve seat 13 in the valve seat 13. When controller 201 receives a request for sealing by the inlet sealing valve 174, the controller 201 causes the inlet sealing valve 174 to be in a fully closed state after executing opening and closing repetition control of moving the valve body 14 in the valve opening direction and the valve closing direction while increasing the degree of opening change B compared with the degree of opening change A in a state where the valve body 14 and the rubber seal portion 13a are sliding.SELECTED DRAWING: Figure 9

Description

  The present disclosure relates to a sealing valve control system that controls an opening / closing operation of a sealing valve that opens and closes a flow path, and a fuel cell system including the sealing valve control system.

  As a prior art, there is a fuel cell system as disclosed in Patent Document 1. This fuel cell system includes a fuel cell that generates power upon receiving supply of hydrogen gas supplied from a hydrogen gas piping system and oxygen gas supplied from an oxygen gas piping system. The oxygen gas piping system includes an oxygen off-gas exhaust passage and an electromagnetic valve that opens and closes the oxygen off-gas exhaust passage.

JP 2005-285686 A

  For a sealing valve that opens and closes a gas flow path like the above-described electromagnetic valve, a rubber seal portion is provided at a contact portion of the valve seat with the valve body in order to improve the sealing performance (sealability) between the valve seat and the valve body. May be provided. In this case, when the sealing valve in the valve open state is closed, the rubber seal portion provided in the valve seat is twisted by the sliding resistance generated between the valve body and the seat surface in contact with the valve body in the rubber seal portion. Concavities and convexities occur, and gas leakage may occur in the fully closed sealing valve.

  Accordingly, the present disclosure has been made to solve the above-described problems, and an object thereof is to provide a sealing valve control system and a fuel cell system that can prevent gas leakage in a fully closed sealing valve. And

  An embodiment of the present disclosure made to solve the above problems includes a gas flow path through which a gas flows, a sealing valve that opens and closes the gas flow path, and a control unit that controls an opening and closing operation of the sealing valve. In the sealing valve control system, the sealing valve is provided with a seal member that seals between the valve body and the valve seat on either the valve seat or the valve body, and the control unit When there is a sealing request by the sealing valve, the valve body or the valve body and the seal member are slid in a state in which the valve body moves more than the amount of movement in the valve opening direction. After performing opening / closing control to move the valve body in the valve opening direction and the valve closing direction while increasing the amount of movement in the valve closing direction, the sealing valve is fully closed.

  According to this aspect, the valve body is opened and closed while the valve body or the valve seat and the seal member are slid until the sealing valve in the open state is closed and fully closed. Control to move in the direction. As a result, the sealing valve can be fully closed by making the contact surface of the seal member with the valve body or the valve seat flat while eliminating (suppressing) the twist of the seal member. As a result, the grounding state of the valve body or the valve seat and the seal member in the fully closed state of the sealing valve is stabilized. Therefore, it is possible to achieve both the securing of the seal width and the stabilization of the ground contact state between the valve body or the valve seat and the seal member. Therefore, when the sealing valve is fully closed, sealing performance is improved between the valve body or the valve seat and the seal member, and gas leakage can be prevented.

  In the above aspect, in the opening / closing control, it is preferable that the valve body is repeatedly moved in a valve opening direction and a valve closing direction.

  According to this aspect, the valve body is opened and closed while the valve body or the valve seat and the seal member are slid until the sealing valve in the open state is closed and fully closed. It is repeatedly moved in the direction and controlled so that the opening gradually decreases. As a result, the sealing valve can be fully closed by making the contact surface of the seal member with the valve body or the valve seat flat while effectively eliminating the twist of the seal member. Thereby, the grounding state of the valve body or the valve seat and the seal member in the fully closed state of the sealing valve is more effectively stabilized.

  In the above aspect, the control unit, after making the sealing valve fully closed, operates the valve body in a direction to press the valve body against the valve seat, and the valve body from the valve seat. It is preferable to perform full-closed holding release control that acts in the direction of releasing.

  According to this aspect, the twist of the seal member can be eliminated by performing the fully closed holding control and the fully closed holding release control after the sealing valve is fully closed. Thereby, the grounding state of the valve body or the valve seat and the seal member in the fully closed state of the sealing valve is stabilized.

  In the above aspect, it is preferable that the control unit repeatedly performs the fully closed hold control and the fully closed hold release control.

  According to this aspect, the twist of the seal member can be more effectively eliminated by repeatedly performing the fully closed holding control and the fully closed holding release control. Thereby, the grounding state of the valve body or the valve seat and the seal member in the fully closed state of the sealing valve is more effectively stabilized.

  Another aspect of the present disclosure made to solve the above problems includes a gas flow path through which a gas flows, a sealing valve that opens and closes the gas flow path, and a control unit that controls an opening and closing operation of the sealing valve. In the sealing valve control system, the sealing valve is provided with a seal member that seals between the valve body and the valve seat on either the valve seat or the valve body, and the control And a fully-closed holding control in which the valve body is operated in a direction to push the valve body against the valve seat, and a fully-closed holding control in which the valve body is operated in a direction away from the valve seat after the sealing valve is fully closed. And release control.

  According to this aspect, the twist of the seal member can be eliminated (suppressed) by performing the fully closed holding control and the fully closed holding release control after the sealing valve is fully closed. Thereby, the grounding state of the valve body or the valve seat and the seal member in the fully closed state of the sealing valve is stabilized. Therefore, it is possible to achieve both the securing of the seal width and the stabilization of the ground contact state between the valve body or the valve seat and the seal member. Therefore, when the sealing valve is fully closed, sealing performance is improved between the valve body or the valve seat and the seal member, and gas leakage can be prevented.

  In the above aspect, it is preferable that the control unit repeatedly performs the fully closed hold control and the fully closed hold release control.

  According to this aspect, the twist of the seal member can be more effectively eliminated by repeatedly performing the fully closed holding control and the fully closed holding release control. Thereby, the grounding state of the valve body or the valve seat and the seal member in the fully closed state of the sealing valve is more effectively stabilized.

  Another aspect of the present disclosure made to solve the above problems is provided in a fuel cell, an oxidant gas supply passage for supplying an oxidant gas to the fuel cell, and the oxidant gas supply passage. An upstream valve, an oxidant gas discharge passage for discharging the oxidant gas supplied to the fuel cell, a downstream valve provided in the oxidant gas discharge passage, a control unit for performing various controls, In the fuel cell system, the upstream valve and the downstream valve are provided with a seal member for sealing between the valve body and the valve seat on either the valve seat or the valve body. The valve opening direction of the valve body in a state in which the valve seat or the valve body and the seal member are slid when there is a sealing request by the upstream valve or the downstream valve. The amount of movement of the valve body in the valve closing direction is larger than the amount of movement of After performing open / close control to move the valve body in the valve opening direction and the valve closing direction, the upstream valve or the downstream valve is fully closed, and the valve body opening direction in the upstream valve or The movement amount in the valve closing direction is made smaller than the movement amount in the valve opening direction or valve closing direction of the valve body in the downstream valve.

  According to this aspect, for example, the upstream valve that is likely to be in a dry state can be gradually closed while being opened and closed more gradually than the downstream valve, so that the seal member is twisted ( Suppression). Therefore, similarly to the downstream valve, the grounding state of the valve body or the valve seat and the seal member in the fully closed state of the upstream valve is stabilized. Therefore, for the upstream side valve and the downstream side valve, it is possible to achieve both the securing of the seal width and the stabilization of the ground contact state between the valve body or the valve seat and the seal member. Therefore, when the upstream side valve and the downstream side valve are fully closed, the sealing performance is improved between the valve body or the valve seat and the seal member, and gas leakage can be prevented.

  In the above aspect, the control unit closes the valve body in the valve opening direction in the downstream valve, and sets the number of times of opening and closing the valve body in the valve opening direction and the valve closing direction in the upstream valve. It is preferable to increase the number of times of opening and closing to be moved in the valve direction.

  According to this aspect, the upstream side valve can be fully closed by sliding the valve body or the valve seat and the seal member more times than the downstream side valve. Similar to the valve, twisting of the seal member can be eliminated for the upstream valve. Therefore, the ground contact state of the valve body or the valve seat and the seal member in the fully closed state of the upstream side valve and the downstream side valve is more effectively stabilized.

  Another aspect of the present disclosure made to solve the above problems is provided in a fuel cell, an oxidant gas supply passage for supplying an oxidant gas to the fuel cell, and the oxidant gas supply passage. An upstream valve, an oxidant gas discharge passage for discharging the oxidant gas supplied to the fuel cell, a downstream valve provided in the oxidant gas discharge passage, a control unit for performing various controls, In the fuel cell system, the upstream valve and the downstream valve are provided with a seal member for sealing between the valve body and the valve seat on either the valve seat or the valve body. The valve opening direction of the valve body in a state in which the valve seat or the valve body and the seal member are slid when there is a sealing request by the upstream valve or the downstream valve. The amount of movement of the valve body in the valve closing direction is larger than the amount of movement of After opening / closing control for moving the valve body in the valve opening direction and the valve closing direction, the upstream valve or the downstream valve is fully closed, and the valve body is opened in the upstream valve. The number of times of opening and closing to be moved in the valve closing direction is made larger than the number of times of opening and closing to move the valve body in the valve opening direction and the valve closing direction at the downstream valve.

  According to this aspect, the upstream side valve can be fully closed by sliding the valve body or the valve seat and the seal member more times than the downstream side valve. Also for the side valve, the twist of the seal member can be eliminated. Therefore, the grounding state of the valve body or the valve seat and the seal member in the fully closed state of the upstream side valve and the downstream side valve is stabilized. Therefore, for the upstream side valve and the downstream side valve, it is possible to achieve both the securing of the seal width and the stabilization of the ground contact state between the valve body or the valve seat and the seal member. Therefore, when the upstream side valve and the downstream side valve are fully closed, the sealing performance is improved between the valve body or the valve seat and the seal member, and gas leakage can be prevented.

  Another aspect of the present disclosure made to solve the above problems is provided in a fuel cell, an oxidant gas supply passage for supplying an oxidant gas to the fuel cell, and the oxidant gas supply passage. An upstream valve, an oxidant gas discharge passage for discharging the oxidant gas supplied to the fuel cell, a downstream valve provided in the oxidant gas discharge passage, a control unit for performing various controls, In the fuel cell system, the upstream valve and the downstream valve are provided with a seal member for sealing between the valve body and the valve seat on either the valve seat or the valve body. The control unit, after bringing the upstream side valve or the downstream side valve into a fully closed state, operates the valve body in a direction to press the valve body against the valve seat, and the valve body from the valve seat. Fully closed hold release control that acts in the direction of release Increasing the number of times the full-closed holding control and the full-closed holding release control are performed in the upstream valve from the number of times performing the full-closed holding control and the full-closed holding release control in the downstream valve; It is characterized by.

  According to this aspect, for the upstream side valve, the valve body is pressed against the valve seat or separated from the valve seat for a greater number of times than the downstream side valve. The twist of the seal member can be eliminated. Therefore, the grounding state of the valve body or the valve seat and the seal member in the fully closed state of the upstream side valve and the downstream side valve is stabilized. Therefore, for the upstream side valve and the downstream side valve, it is possible to achieve both the securing of the seal width and the stabilization of the ground contact state between the valve body or the valve seat and the seal member. Therefore, when the upstream side valve and the downstream side valve are fully closed, the sealing performance is improved between the valve body or the valve seat and the seal member, and gas leakage can be prevented.

  According to the sealing valve control system and the fuel cell system of the present disclosure, it is possible to prevent gas leakage in the fully closed sealing valve.

1 is a schematic configuration diagram of a fuel cell system according to an embodiment. It is a perspective view of the electric flow control valve provided with the double eccentric valve. It is a perspective view which partially fractures | ruptures and shows the valve | bulb part in a fully closed state. It is a perspective view which fractures | ruptures and shows the valve part in a fully open state. It is a side view which shows the valve seat of a fully closed state, a valve body, and a rotating shaft. It is the sectional view on the AA line of FIG. It is a figure which shows the control flowchart of the inlet sealing valve in 1st Embodiment. It is a figure which shows the control flowchart of the exit integrated valve in 1st Embodiment. It is a figure which shows an example of the control time chart in 1st Embodiment. In 1st Embodiment, it is a figure which shows that the grounding state of the valve body and rubber seal part of a valve seat in a fully closed state is stabilized. It is a figure which shows the control flowchart of the inlet sealing valve in 2nd Embodiment. It is a figure which shows an example of the control time chart of the inlet sealing valve in 2nd Embodiment. In 2nd Embodiment, it is a figure which shows that the grounding state of the valve body and rubber seal part of a valve seat in a fully closed state is stabilized. It is a figure which shows the control flowchart of the exit integrated valve in 2nd Embodiment. It is a figure which shows an example of the control time chart of the exit integrated valve in 2nd Embodiment. It is a figure which shows the control flowchart of the inlet sealing valve in 3rd Embodiment. It is a figure which shows an example of the control time chart of the inlet sealing valve in 3rd Embodiment. It is a figure which shows the control flowchart of the exit integrated valve in 3rd Embodiment. It is a figure which shows an example of the control time chart of the exit integrated valve in 3rd Embodiment. It is a figure which shows the subject which the grounding state of the valve body and rubber seal part of a valve seat in a fully closed state becomes unstable.

  Embodiments of a sealing valve control system and a fuel cell system according to the present disclosure will be described in detail with reference to the drawings.

<First Embodiment>
A fuel cell system according to an embodiment of the present disclosure will be described in detail with reference to FIG. In the present embodiment, a case will be described in which the present disclosure is applied to a fuel cell system that is mounted on a fuel cell vehicle and supplies power to a drive motor (not shown).

  As shown in FIG. 1, the fuel cell system 101 of the present embodiment includes a fuel cell stack (fuel cell) 111, a hydrogen system 112, and an air system 113.

  The fuel cell stack 111 generates power by receiving supply of fuel gas and supply of oxidant gas. In the present embodiment, the fuel gas is hydrogen gas, and the oxidant gas is air. That is, the fuel cell stack 111 generates power by receiving supply of hydrogen gas from the hydrogen system 112 and supply of air from the air system 113. The electric power generated by the fuel cell stack 111 is supplied to a drive motor (not shown) via an inverter (not shown).

  The hydrogen system 112 is provided on the anode side of the fuel cell stack 111. The hydrogen system 112 includes a hydrogen supply passage 121, a hydrogen discharge passage 122, and a filling passage 123. The hydrogen supply passage 121 is a passage for supplying hydrogen gas from the hydrogen tank 131 to the fuel cell stack 111. The hydrogen discharge passage 122 is a passage for discharging hydrogen gas discharged from the fuel cell stack 111 (hereinafter referred to as “hydrogen offgas” as appropriate). The filling passage 123 is a passage for filling the hydrogen tank 131 with hydrogen gas from the filling port 151.

The hydrogen system 112 includes a main stop valve 132, a high pressure regulator 133, an intermediate pressure relief valve 134, a pressure sensor 135, an injector unit (fuel gas supply unit) 136, and a low pressure relief valve in order from the hydrogen tank 131 side in the hydrogen supply passage 121. 137 and a pressure sensor 138 are provided. The main stop valve 132 is a valve that switches between supply and shutoff of hydrogen gas from the hydrogen tank 131 to the hydrogen supply passage 121. The high pressure regulator 133 is a pressure adjustment valve for reducing the pressure of hydrogen gas. The intermediate pressure relief valve 134 is a valve that opens when the pressure between the high pressure regulator 133 and the injector unit 136 in the hydrogen supply passage 121 exceeds a predetermined pressure, and adjusts the pressure below the predetermined pressure. The pressure sensor 135 is a sensor that detects the pressure between the high-pressure regulator 133 and the injector unit 136 in the hydrogen supply passage 121. The injector unit 136 is a mechanism that adjusts the flow rate of hydrogen gas. The low-pressure relief valve 137 is a valve that opens when the pressure between the injector section 136 and the fuel cell stack 111 in the hydrogen supply passage 121 is equal to or higher than a predetermined pressure, and adjusts the pressure below the predetermined pressure. The pressure sensor 138 is a sensor that detects the pressure between the injector unit 136 and the fuel cell stack 111 in the hydrogen supply passage 121.

  Further, in the hydrogen system 112, a gas-liquid separator 141 and an exhaust / drain valve 142 are arranged in this order from the fuel cell stack 111 side in the hydrogen discharge passage 122. The gas-liquid separator 141 is a device that separates moisture in the hydrogen off-gas. The exhaust / drain valve 142 is a valve that switches between discharging and shutting off hydrogen off-gas and moisture from the gas-liquid separator 141 to the diluter 182 of the air system 113.

  The air system 113 is provided on the cathode side of the fuel cell stack 111. The air system 113 includes an air supply passage 161, an air discharge passage 162, and a bypass passage 163. The air supply passage 161 is a passage through which air flows, and is a passage for supplying air from the outside of the fuel cell system 101 to the fuel cell stack 111. The air discharge passage 162 is a passage through which air flows, and is a passage for discharging air discharged from the fuel cell stack 111 (hereinafter, referred to as “air off gas” as appropriate). The bypass passage 163 is a passage through which air flows from the air supply passage 161 to the air discharge passage 162 without passing through the fuel cell stack 111.

  The air system 113 includes a compressor 172, an intercooler 173, and an inlet sealing valve (upstream valve) 174 in order from the air cleaner 171 side in the air supply passage 161. The air cleaner 171 is a device that cleans the air taken from the outside of the fuel cell system 101. The compressor 172 is a device that supplies air to the fuel cell stack 111. The intercooler 173 is a device that cools air. The inlet sealing valve 174 is a sealing valve that opens and closes the air supply passage 161 and is a valve that switches between supply and shutoff of air to the fuel cell stack 111.

  In the air system 113, an outlet integrated valve (downstream valve) 181 and a diluter 182 are arranged in order from the fuel cell stack 111 side in the air discharge passage 162.

  The outlet integrated valve 181 is a sealing valve that opens and closes the air discharge passage 162, and is a valve (a valve having a sealing function) that switches between discharging and shutting off the air-off gas from the fuel cell stack 111. Further, the outlet integrated valve 181 is a valve (a valve having a pressure adjustment (flow rate control) function) that controls the discharge amount of the air-off gas from the fuel cell stack 111 by adjusting the back pressure of the fuel cell stack 111.

  The diluter 182 is a device that dilutes the hydrogen off gas discharged from the hydrogen discharge passage 122 by the air off gas and the air flowing through the bypass passage 163.

  The air system 113 includes a bypass valve 191 in the bypass passage 163. The bypass valve 191 is a valve that controls the flow rate of air in the bypass passage 163.

  The fuel cell system 101 also includes a controller (control unit) 201 that controls the system. The controller 201 controls each device provided in the fuel cell system 101 and makes various determinations. In the present embodiment, the controller 201 also controls the opening / closing operations of the inlet sealing valve 174 and the outlet integrated valve 181. The fuel cell system 101 also includes a cooling system (not shown) that cools the fuel cell stack 111. In the present embodiment, the controller 201 is an ECU, for example.

  In the fuel cell system 101 configured as described above, the hydrogen gas supplied from the hydrogen supply passage 121 to the fuel cell stack 111 is used for power generation in the fuel cell stack 111. Thereafter, the hydrogen gas is discharged from the fuel cell stack 111 to the outside of the fuel cell system 101 through the hydrogen discharge passage 122 and the diluter 182 as a hydrogen off gas. In addition, the air supplied from the air supply passage 161 to the fuel cell stack 111 is used for power generation in the fuel cell stack 111, and then the air off gas from the fuel cell stack 111 is passed through the air discharge passage 162 and the diluter 182. It is discharged outside the fuel cell system 101.

  In the present embodiment, the air supply passage 161 and the air discharge passage 162, the inlet sealing valve 174, the outlet integrated valve 181 and the controller 201 constitute a sealing valve control system.

  FIG. 2 is a perspective view of an electric flow control valve 1 (an example of a “sealing valve”) provided with a double eccentric valve. In the present embodiment, the flow control valve 1 is employed as the inlet sealing valve 174 and the outlet integrated valve 181. Note that the flow control valve 1 may also be adopted for the bypass valve 191.

  The flow control valve 1 includes a valve portion 2 constituted by a double eccentric valve, a motor portion 3 incorporating a motor, and a speed reduction mechanism portion 4 incorporating a plurality of gears. The valve section 2 includes a metal pipe section 12 having a flow path 11 through which a fluid flows. A valve seat 13, a valve body 14, and a rotating shaft 15 are disposed in the flow path 11. The inner shape of the flow path 11, the outer shape of the valve seat 13, and the outer shape of the valve element 14 are each circular or almost circular in plan view. The rotational force of the motor is transmitted to the rotating shaft 15 via a plurality of gears. In this embodiment, the pipe portion 12 having the flow path 11 corresponds to a part of the housing 6, and the motor of the motor portion 3 and the plurality of gears of the speed reduction mechanism portion 4 are covered by the housing 6. The housing 6 is made of a metal such as aluminum.

  As shown in FIGS. 3 and 4, a step portion 10 is formed in the flow path 11, and a valve seat 13 is incorporated in the step portion 10. The valve seat 13 has an annular shape and has a circular or substantially circular valve hole 16 in the center. An annular seat surface 17 is formed at the edge of the valve hole 16. In this embodiment, the valve seat 13 is provided with a rubber seal portion 13a (an example of a “seal member”) for sealing between the valve seat 13 and the valve body 14, and the rubber seal portion 13a has a seat surface. 17 is formed. The valve body 14 has a disc shape, and an annular seal surface 18 corresponding to the seat surface 17 is formed on the outer periphery thereof. The valve body 14 is fixed to the rotary shaft 15 and rotates integrally with the rotary shaft 15.

  As shown in FIGS. 3 to 6, the axis L <b> 1 of the rotary shaft 15 extends parallel to the radial direction of the valve body 14 and the valve hole 16, and is eccentrically arranged from the center P <b> 1 of the valve hole 16 to the radial direction of the valve hole 16. At the same time, the sealing surface 18 of the valve body 14 is arranged eccentrically in the direction in which the axis L2 of the valve body 14 extends from the axis L1 of the rotating shaft 15. Further, by rotating the valve body 14 about the axis L1 of the rotary shaft 15, a fully closed position (see FIG. 3) where the seal surface 18 of the valve body 14 comes into surface contact with the seat surface 17 of the valve seat 13 is obtained. It is configured to be movable between a fully open position (see FIG. 4) farthest from the sheet surface 17.

  In this embodiment, in FIG. 6, the valve body 14 starts to rotate in the valve opening direction (the direction of the arrow F1 shown in FIG. 6, ie, the clockwise direction in FIG. 6) from the fully closed position, and at the same time the seal of the valve body 14 The surface 18 starts to move away from the seat surface 17 of the valve seat 13 and starts to move along the rotation trajectories T1 and T2 about the axis L1 of the rotation shaft 15.

  As shown in FIGS. 5 and 6, the valve body 14 includes a mountain-shaped fixing portion 14 b that protrudes from the upper plate surface 14 a and is fixed to the rotating shaft 15. The fixing portion 14b is fixed to the rotating shaft 15 via a pin 15a protruding from the tip of the rotating shaft 15 at a position shifted from the axis L1 of the rotating shaft 15 in the radial direction of the rotating shaft 15. In addition, as shown in FIG. 6, the fixed portion 14 b is disposed on the axis L <b> 2 of the valve body 14, and the valve body 14 including the fixed portion 14 b has a bilaterally symmetric shape about the axis L <b> 2 of the valve body 14. Formed.

  In the air system 113 shown in FIG. 1, there are parts such as a compressor 172 that cannot completely remove foreign matter even after cleaning, upstream of the fuel cell stack 111. Therefore, there is a possibility that minute foreign matter (foreign matter having a size of several hundred μm) may be caught between the valve seat 13 and the valve body 14 in the inlet sealing valve 174 or the outlet integrated valve 181. Therefore, in order to maintain zero air leakage in the fully closed state in which the valve body 14 is in the fully closed position even if foreign matter is caught in the inlet sealing valve 174 or the outlet integrated valve 181, the rubber seal of the valve seat 13 is used. It is necessary to secure the seal width, which is the width of the portion where the portion 13a and the valve body 14 are in contact, to be equal to or greater than the size of foreign matter (several hundreds of micrometers). Then, the sliding range (sliding resistance) between the rubber seal portion 13a and the valve element 14 is inevitably increased, and the rubber seal portion 13a is twisted as shown in FIG. The amount of displacement of the portion 13a increases. Therefore, the ground contact state of the rubber seal portion 13a and the valve body 14 in the fully closed state becomes unstable. Accordingly, in the fully closed state, air leakage (gas leakage) is likely to occur due to poor grounding between the rubber seal portion 13a and the valve body 14.

  Therefore, in the present embodiment, in order to prevent such air leakage in the fully closed state, the controller 201 executes control based on the control flowchart shown in FIG. 7 when the valve-opened inlet sealing valve 174 is closed. To do.

  First, as shown in FIG. 7, it is determined whether or not there is a sealing request by the inlet sealing valve 174 (step S1). If there is a request for sealing by the inlet sealing valve 174 (step S1: YES), the opening degree ta_in of the inlet sealing valve 174 is taken in (step S2). The opening degree ta_in is the actual opening degree (current opening degree) of the inlet sealing valve 174, and is detected by, for example, an opening degree sensor (not shown) provided in the inlet sealing valve 174.

  Next, it is determined whether the opening degree ta_in is smaller than the predetermined opening degree α (step S3). Here, the predetermined opening degree α is an opening degree at which the valve body 14 and the rubber seal portion 13a of the valve seat 13 are in contact (sliding), and is, for example, 8 °.

  When the opening degree ta_in is smaller than the predetermined opening degree α (step S3: YES), the opening / closing repetition control described later is performed, so that the opening degree of the inlet sealing valve 174 at the start of the opening / closing repetition control is set as the current opening degree. Is stored as the opening degree TA_IN (i) (step S5).

  On the other hand, when the opening degree ta_in is equal to or larger than the predetermined opening degree α (step S3: NO), control is performed to close the inlet sealing valve 174 until the opening degree ta_in becomes smaller than the predetermined opening degree α. After (Step S4), the opening degree TA_IN (i) is stored (Step S5).

  Next, as opening / closing repetition control, first, the valve opening control of the inlet sealing valve 174 is performed (step S6), and the valve body 14 is moved in the valve opening direction while sliding the valve body 14 and the rubber seal portion 13a. Move. Then, the opening degree ta_in is taken in (step S7), and it is determined whether or not the opening degree ta_in is larger than the opening degree (TA_IN (i) + A) (step S8). Then, until the opening degree ta_in becomes larger than the opening degree (TA_IN (i) + A) (step S8: YES), the valve opening control of the inlet sealing valve 174 is performed (step S6), and the opening degree ta_in is taken in. (Step S7). Here, the opening degree change amount A is a movement amount of the valve body 14 in the valve opening direction in the inlet sealing valve 174, that is, the valve body 14 is opened by performing valve opening control of the inlet sealing valve 174. The amount of change in opening when moving in the direction (the amount of change in opening when the upstream valve is opened). The opening degree (TA_IN (i) + A) is a target opening degree when valve opening control of the inlet sealing valve 174 is performed to move the valve body 14 in the valve opening direction. The opening change amount A is, for example, 2 °.

  Then, when the opening degree ta_in is larger than the opening degree (TA_IN (i) + A) (step S8: YES), the valve closing control of the inlet sealing valve 174 is performed (step S9). The valve body 14 is moved in the valve closing direction while sliding the rubber seal portion 13a. Thus, if the valve body 14 is moved in the valve opening direction for the opening width corresponding to the opening change amount A, the valve body 14 is moved in the valve closing direction.

At this time, as shown in the following formula, the opening degree TA_IN (i) is updated (step S10). Here, the opening change amount B is the amount of movement of the valve body 14 in the valve closing direction of the inlet sealing valve 174, that is, the valve body 14 is closed by performing the valve closing control of the inlet sealing valve 174. The amount of change in opening when moving in the direction (the amount of change in opening when the upstream valve is closed). The opening degree (TA_IN (i-1) -B) is a target opening degree when the valve closing control of the inlet sealing valve 174 is performed to move the valve element 14 in the valve closing direction. The opening change amount B is larger than the opening change amount A, for example, 3 °.
[Equation 1]
TA_IN (i) <-TA_IN (i-1) -B

  Next, it is determined whether the opening degree TA_IN (i) is 0 ° or more (step S11). That is, it is determined whether or not the opening degree TA_IN (i) is larger than the opening degree of the inlet sealing valve 174 in the fully closed state. In other words, it is determined whether or not the inlet sealing valve 174 has been fully closed.

  And when opening degree TA_IN (i) is 0 degree or more (step S11: YES), opening / closing repetition control is continued. Therefore, the opening degree ta_in is taken in (step S12), and when the opening degree ta_in becomes smaller than the opening degree TA_IN (i) (step S13: YES), the process returns to step S6 and the inlet sealing valve 174 is opened. To do. Thus, if the valve body 14 is moved in the valve closing direction for the opening width corresponding to the opening change amount B, the valve body 14 is moved in the valve opening direction.

  In this way, in this embodiment, when there is a request for sealing by the inlet sealing valve 174, when the inlet sealing valve 174 is closed, the opening / closing repeated control is performed before the inlet sealing valve 174 is fully closed. (An example of “open / close control”). Here, the repeated opening / closing control is control in which the valve body 14 is repeatedly moved in the valve opening direction and the valve closing direction in a state where the valve body 14 and the rubber seal portion 13a are slid. More specifically, at this time, the valve element 14 is moved in the valve closing direction (opening amount change amount B) larger than the valve element 14 moving amount in the valve opening direction (opening degree change amount A). The valve body 14 is repeatedly moved in the valve opening direction and the valve closing direction while gradually shifting the valve 14 in the valve closing direction.

  On the other hand, in step S11, when the opening degree TA_IN (i) is less than 0 ° (step S11: NO), in order to complete the opening / closing repeated control, the opening degree ta_in becomes 0 or less (step S14, step S14). S15: YES), the sealing valve closing control (opening / closing repetition control) of the inlet sealing valve 174 is completed (step S16). In this way, the controller 201 fully closes the inlet sealing valve 174 after performing repeated opening / closing control.

  Further, such control related to the inlet sealing valve 174 can also be applied to control related to the outlet integrated valve 181 as shown in FIG.

  The control shown in FIG. 8 differs from the control shown in FIG. 7 in that the opening degree ta_in becomes the opening degree ta_out, the opening degree TA_IN (i) becomes the opening degree TA_OUT (i), and the predetermined opening degree α becomes the predetermined opening degree β. (For example, 6 °). Further, the opening change amount A becomes an opening change amount C (opening amount change amount when the downstream valve is opened) (for example, 3 °), and the opening change amount B becomes an opening change amount D (downstream valve). (Amount of change in opening when the valve is closed) (for example, 5 °). Note that α> β, A <C, B <D, and C <D. The rest is common and will not be described.

  By executing the control based on the above control flowchart, for example, the control represented by the control time chart as shown in FIG. 9 is executed. As shown in FIG. 9, with respect to the inlet sealing valve 174 (partially indicated by a dotted line in the figure), the opening degree ta_in becomes less than the predetermined opening degree α, and then the opening / closing repeated control is performed, and then the valve is fully closed. It becomes a state. Further, the outlet integrated valve 181 is fully closed after the opening degree ta_in is less than the predetermined opening degree β, and thereafter the opening / closing repeated control is performed.

  As described above, according to the present embodiment, the controller 201 performs the opening / closing repetition control when there is a sealing request by the inlet sealing valve 174 (outlet integrated valve 181), and then performs the inlet sealing valve 174 (outlet). The integrated valve 181) is fully closed.

  In this way, the valve body 14 and the rubber seal portion 13a of the valve seat 13 are slid until the inlet sealing valve 174 (exit integrated valve 181) in the opened state is closed and fully closed. Then, the valve body 14 is repeatedly moved in the valve opening direction and the valve closing direction, and the opening degree is controlled to be gradually reduced. Accordingly, the twist of the rubber seal portion 13a is eliminated (suppressed) and the displacement amount of the rubber seal portion 13a is reduced, and the seat surface 17 is made flat as shown in FIG. The valve 181) can be fully closed. As a result, the grounding state of the valve body 14 and the rubber seal portion 13a in the fully closed state of the inlet sealing valve 174 (outlet integrated valve 181) is stabilized. Therefore, it is possible to achieve both the securing of the seal width and the stabilization of the ground contact state between the valve body 14 and the rubber seal portion 13a. Therefore, when the inlet sealing valve 174 (outlet integrated valve 181) is fully closed, sealing performance is improved between the valve body 14 and the rubber seal portion 13a, and air leakage can be prevented.

  Here, the inlet sealing valve 174 is provided in an air supply passage 161 through which air taken in from the outside of the fuel cell system 101 flows, and is provided in the air discharge passage 162 and is generated in the fuel cell stack 111 (generated water). ) Is more likely to be in a dry state than the outlet integrated valve 181 that may adhere thereto. Therefore, in the inlet sealing valve 174, the frictional resistance (sliding resistance) between the valve body 14 and the rubber seal portion 13a is likely to be larger than that of the outlet integrated valve 181.

  Therefore, in the present embodiment, the controller 201 uses the opening change amount A when the valve element 14 is moved in the valve opening direction by the inlet sealing valve 174, and the valve element 14 is opened by the outlet integrated valve 181. It is made smaller than the opening degree change amount C when moving to. Further, the controller 201 uses the opening degree change amount B when the valve body 14 is moved in the valve closing direction by the inlet sealing valve 174, and is used when the valve body 14 is moved in the valve closing direction by the outlet integrated valve 181. The opening degree change amount D is made smaller. Then, as shown in FIG. 9, the controller 201 gives the outlet integrated valve 181 the number of opening / closing operations (upstream valve opening / closing frequency) for moving the valve element 14 in the valve opening direction and the valve closing direction by the inlet sealing valve 174. Thus, the number of opening / closing operations for moving the valve body 14 in the valve opening direction and the valve closing direction (the number of downstream valve opening / closing operations) is increased.

  As a result, the inlet sealing valve 174 that is likely to be in a dry state can be gradually closed while being opened / closed in smaller increments than the outlet integrated valve 181 so as to be fully closed. ). Therefore, similarly to the outlet integrated valve 181, the grounding state of the valve body 14 and the rubber seal portion 13a in the fully closed state of the inlet sealing valve 174 is stabilized.

Second Embodiment
Next, the second embodiment will be described. The same components as those in the first embodiment are denoted by the same reference numerals, description thereof will be omitted, and different points will be mainly described.

  In the present embodiment, in addition to the control of the first embodiment, a fully-closed hold duty control (an example of “fully closed hold control”) and a fully closed duty 0% (cut) control (“fully closed hold release control”), which will be described later, are performed. (Example) is repeatedly performed. Specifically, the controller 201 executes control based on the control flowchart shown in FIG.

  As shown in FIG. 11, it is determined whether or not there is a sealing request by the inlet sealing valve 174 (step S201). If there is a request for sealing by the inlet sealing valve 174 (step S201: YES), it is determined whether or not the opening / closing repeated control (the control shown in FIG. 7) has been completed for the inlet sealing valve 174. (Step S202).

  When the opening / closing repetition control is completed for the inlet sealing valve 174 (step S202: YES), that is, when the opening / closing repetition control is completed and the inlet sealing valve 174 is fully closed, the number of applied on / off times It is determined whether n (i) is equal to or greater than a predetermined number E (step S203). Here, the number of applied on / off times n (i) is the number of on / off times of voltage application to the drive unit of the valve body 14 in the inlet sealing valve 174.

  When the number of applied on / off times n (i) is less than the predetermined number E (step S203: NO), the fully-closed hold duty control is executed (step S204), and then the fully-closed duty 0% control is executed for 100 ms (step S204). Step S205). Here, the fully-closed hold duty control is a control that causes the valve body 14 to be pressed in the direction of pressing the rubber seal portion 13a. For example, the voltage is applied to a drive portion (for example, a motor) of the valve body 14 with a duty ratio (Duty ratio). ) 100% (100 seconds (0.1 second) applied control). Further, the fully closed duty 0% control is a control in which the valve body 14 is actuated in a direction away from the rubber seal portion 13a. For example, the voltage is not applied to the drive portion of the valve body 14 for 100 ms.

Next, the application ON / OFF count n (i) is increased by one as shown in the following equation (step S206), and the process returns to step S203.
[Equation 2]
n (i) ← n (i−1) +1

  When the application ON / OFF count n (i) becomes equal to or greater than the predetermined count E (step S203: YES), the sealing valve closing control of the inlet sealing valve 174 is completed (step S207).

  If there is no request for sealing by the inlet sealing valve 174 in step S201 (step S201: NO), the routine proceeds to the processing of the normal control routine for the inlet sealing valve 174. If the opening / closing repeated control of the inlet sealing valve 174 is not completed in step S202 (step S202: NO), the application ON / OFF count n (i) is set to “0” (step S208), and the inlet sealing valve is set. The process proceeds to the process of the open / close repetitive control routine of 174.

  By executing the control based on the above control flowchart, for example, the control represented by the control time chart as shown in FIG. 12 is executed. As shown in FIG. 12, the opening / closing repetition control is completed at time t1, and then the fully-closed hold duty control and the fully-closed duty 0% control are performed a predetermined number of times E (four times as an example in FIG. 12) until time t2. Repeated for minutes.

  Further, such control related to the inlet sealing valve 174 can be applied to control related to the outlet integrated valve 181 as shown in FIG.

  The control shown in FIG. 14 is different from the control shown in FIG. Note that E> F. The rest is common and will not be described.

  By executing the control based on the above control flowchart, for example, the control represented by the control time chart as shown in FIG. 15 is executed. As shown in FIG. 15, the opening / closing repetition control is completed at time t1, and then the fully-closed hold duty control and the fully-closed duty 0% control are performed a predetermined number of times F (three times as an example in FIG. 15) until time t2. Repeatedly.

  As described above, according to the present embodiment, the controller 201 repeatedly performs the fully-closed hold duty control and the fully-closed duty 0% control after the inlet seal valve 174 (outlet integrated valve 181) is fully closed.

  In this way, after the inlet sealing valve 174 (outlet integrated valve 181) is fully closed, the fully-closed hold duty control and the fully-closed duty 0% control are repeatedly performed to eliminate the twist of the rubber seal portion 13a ( Suppression). Thereby, the grounding state of the valve body 14 and the rubber seal part 13a in the fully closed state of the inlet sealing valve 174 (outlet integrated valve 181) is stabilized. Therefore, it is possible to achieve both the securing of the seal width and the stabilization of the ground contact state between the valve body 14 and the rubber seal portion 13a. Therefore, when the inlet sealing valve 174 (outlet integrated valve 181) is fully closed, sealing performance is improved between the valve body 14 and the rubber seal portion 13a, and air leakage can be prevented.

  That is, as shown in FIG. 13, with respect to the inlet sealing valve 174 and the outlet integrated valve 181, the grounding state of the valve body 14 and the rubber seal portion 13a in the fully closed state is stabilized, and the air between the valve body 14 and the rubber seal portion 13a is stabilized. There is no leakage.

  Here, the inlet sealing valve 174 is more likely to be dry than the outlet integrated valve 181 as described above. Therefore, in the inlet sealing valve 174, the frictional resistance (sliding resistance) between the valve body 14 and the rubber seal portion 13a is likely to be larger than that of the outlet integrated valve 181. Therefore, in the present embodiment, the predetermined number E is made larger than the predetermined number F. That is, the number of times that the fully-closed hold duty control and the fully-closed duty 0% control are performed at the inlet sealing valve 174 (the number of times when the upstream valve is fully closed and held is released) and the fully integrated hold duty control and the fully closed state at the outlet integrated valve 181 are set. More than the number of times Duty 0% control is performed (the number of times the downstream valve is fully closed).

  As a result, the inlet sealing valve 174 can be fully closed by sliding the valve body 14 and the rubber seal portion 13a more times than the outlet integrated valve 181. The sealing valve 174 can also eliminate the twist of the rubber seal portion 13a. Therefore, the grounding state of the valve body 14 and the rubber seal portion 13a in the fully closed state of the inlet sealing valve 174 and the outlet integrated valve 181 is stabilized.

<Third Embodiment>
Next, the third embodiment will be described. The same components as those in the first and second embodiments are denoted by the same reference numerals, description thereof will be omitted, and different points will be mainly described.

  In the present embodiment, among the controls performed in the second embodiment, the control for repeatedly performing the fully closed duty control and the fully closed duty 0% control is performed independently. Specifically, the controller 201 executes control based on the control flowchart shown in FIG.

  First, as shown in FIG. 16, it is determined whether or not there is a sealing request by the inlet sealing valve 174 (step S401). When there is a request for sealing by the inlet sealing valve 174 (step S401: YES), control is performed to close the inlet sealing valve 174 in the opened state (step S402). Then, after the inlet sealing valve 174 is in the fully closed state (step S403: YES), when the fully closed hold duty control and the fully closed duty 0% control are repeated for a predetermined number of times E (steps S404 to S407), the inlet The sealing valve closing control of the sealing valve 174 is completed (step S408).

  By executing the control based on the above control flowchart, for example, the control represented by the control time chart as shown in FIG. 17 is executed. As shown in FIG. 17, when the inlet sealing valve 174 is fully closed at time t1, the fully closed hold duty control and the fully closed duty cut control are repeatedly performed from time t2 to time t3.

  Further, such control related to the inlet sealing valve 174 can be applied to control related to the outlet integrated valve 181 as shown in FIG.

  The control shown in FIG. 18 is different from the control shown in FIG. The rest is common and will not be described.

  By executing the control based on the above control flowchart, for example, the control represented by the control time chart as shown in FIG. 19 is executed. As shown in FIG. 19, when the outlet integrated valve 181 enters the fully closed state at time t1, the fully closed hold duty control and the fully closed duty cut control are repeatedly performed from time t2 to time t3.

  It should be noted that the above-described embodiment is merely an example, and does not limit the present disclosure in any way, and various improvements and modifications can be made without departing from the scope of the present invention.

  For example, instead of providing the rubber seal portion 13a on the valve seat 13 as described above, the valve body 14 may be provided with a rubber seal portion. Further, the control based on the control flowchart may be applied to the bypass valve 191. In addition, the positions of the valve body 14 and the valve seat 13 are exchanged, and the valve body 14 is controlled to operate in the direction of separating the valve body 14 from the rubber seal portion 13a of the valve seat 13 for the fully closed hold duty control, and the valve body 14 for the fully closed duty 0% control. It is good also as control which acts on the rubber seal part 13a of the valve seat 13 in the direction pressed. Further, control (an example of “open / close control”) in which the valve body 14 is moved only once in the valve opening direction and the valve closing direction may be performed. Further, the fully closed hold duty control and the fully closed duty 0% control may be performed only once.

DESCRIPTION OF SYMBOLS 1 Flow control valve 2 Valve part 13 Valve seat 13a Rubber seal part 14 Valve body 16 Valve hole 17 Seat surface 18 Seal surface 101 Fuel cell system 111 Fuel cell stack (fuel cell)
112 Hydrogen system 113 Air system 161 Air supply passage 162 Air discharge passage 174 Inlet sealing valve 181 Outlet integrated valve 191 Bypass valve 201 Controller ta_in Opening (actual opening)
TA_IN (i) Opening α Predetermined opening A Opening change B Opening change ta_out Opening (actual opening)
TA_OUT (i) Opening β Predetermined opening C Opening change amount D Opening change amount n (i) Application ON / OFF count E Predetermined count F Predetermined count t1, t2 Time

Claims (10)

In a sealing valve control system comprising a gas flow path through which a gas flows, a sealing valve that opens and closes the gas flow path, and a control unit that controls an opening and closing operation of the sealing valve,
The sealing valve is
Either one of the valve seat and the valve body is provided with a seal member for sealing between the valve body and the valve seat,
The controller is
When there is a sealing request by the sealing valve, the valve body is closed more than the amount of movement in the valve opening direction of the valve body in a state where the valve seat or the valve body and the seal member are slid. After opening and closing control to move the valve body in the valve opening direction and the valve closing direction while increasing the amount of movement in the direction, the sealing valve is fully closed;
A sealing valve control system. The sealing valve control system of claim 1,
In the opening / closing control, the valve body is repeatedly moved in the valve opening direction and the valve closing direction,
A sealing valve control system. In the sealing valve control system according to claim 1 or 2,
The controller is
After the sealing valve is fully closed, a fully closed holding control that acts in a direction to press the valve body against the valve seat; and a fully closed holding release control that acts in a direction to separate the valve body from the valve seat; Doing,
A sealing valve control system. The sealing valve control system according to claim 3,
The controller is
Repeatedly performing the fully closed holding control and the fully closed holding release control,
A sealing valve control system. In a sealing valve control system comprising a gas flow path through which a gas flows, a sealing valve that opens and closes the gas flow path, and a control unit that controls an opening and closing operation of the sealing valve,
The sealing valve is
Either one of the valve seat and the valve body is provided with a seal member for sealing between the valve body and the valve seat,
The controller is
After the sealing valve is fully closed, a fully closed holding control that acts in a direction to press the valve body against the valve seat; and a fully closed holding release control that acts in a direction to separate the valve body from the valve seat; Doing,
A sealing valve control system. The sealing valve control system of claim 5,
The controller is
Repeatedly performing the fully closed holding control and the fully closed holding release control,
A sealing valve control system. A fuel cell, an oxidant gas supply passage for supplying an oxidant gas to the fuel cell, an upstream valve provided in the oxidant gas supply passage, and an oxidant gas supplied to the fuel cell are discharged. In a fuel cell system having an oxidant gas discharge passage, a downstream valve provided in the oxidant gas discharge passage, and a control unit that performs various controls,
The upstream valve and the downstream valve are:
Either one of the valve seat and the valve body is provided with a seal member for sealing between the valve body and the valve seat,
The controller is
When there is a sealing request by the upstream side valve or the downstream side valve, the valve seat or the valve body and the seal member are slid in a state in which the valve body moves more than the amount of movement in the valve opening direction. After performing open / close control to move the valve body in the valve opening direction and the valve closing direction while increasing the amount of movement in the valve closing direction of the valve body, the upstream valve or the downstream valve is fully closed,
The amount of movement in the valve opening direction or valve closing direction of the valve body in the upstream valve is smaller than the amount of movement in the valve opening direction or valve closing direction of the valve body in the downstream valve;
A fuel cell system. The fuel cell system according to claim 7, wherein
The controller is
The number of times of opening and closing that moves the valve body in the valve opening direction and the valve closing direction at the upstream side valve is greater than the number of times of opening and closing that moves the valve body in the valve opening and closing direction at the downstream side valve. about,
A fuel cell system. A fuel cell, an oxidant gas supply passage for supplying an oxidant gas to the fuel cell, an upstream valve provided in the oxidant gas supply passage, and an oxidant gas supplied to the fuel cell are discharged. In a fuel cell system having an oxidant gas discharge passage, a downstream valve provided in the oxidant gas discharge passage, and a control unit that performs various controls,
The upstream valve and the downstream valve are:
Either one of the valve seat and the valve body is provided with a seal member for sealing between the valve body and the valve seat,
The controller is
When there is a sealing request by the upstream side valve or the downstream side valve, the valve seat or the valve body and the seal member are slid in a state in which the valve body moves more than the amount of movement in the valve opening direction. After performing open / close control to move the valve body in the valve opening direction and the valve closing direction while increasing the amount of movement in the valve closing direction of the valve body, the upstream valve or the downstream valve is fully closed,
The number of times of opening and closing that moves the valve body in the valve opening direction and the valve closing direction at the upstream side valve is greater than the number of times of opening and closing that moves the valve body in the valve opening and closing direction at the downstream side valve. about,
A fuel cell system. A fuel cell, an oxidant gas supply passage for supplying an oxidant gas to the fuel cell, an upstream valve provided in the oxidant gas supply passage, and an oxidant gas supplied to the fuel cell are discharged. In a fuel cell system having an oxidant gas discharge passage, a downstream valve provided in the oxidant gas discharge passage, and a control unit that performs various controls,
The upstream valve and the downstream valve are:
Either one of the valve seat and the valve body is provided with a seal member for sealing between the valve body and the valve seat,
The controller is
After the upstream side valve or the downstream side valve is fully closed, a fully closed holding control that acts in a direction to press the valve body against the valve seat, and a full closure control that acts in a direction to separate the valve body from the valve seat. Closed hold release control,
Increasing the number of times the full-closed holding control and the full-closed holding release control are performed in the upstream valve from the number of times performing the full-closed holding control and the full-closed holding release control in the downstream valve;
A fuel cell system.

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