JP2018077198A - Control device and abnormality diagnostic method of high-pressure fluid control valve - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the practicality of a high-pressure fluid control valve.SOLUTION: The control device includes: a pressure sensor 116 for detecting a pressure in a low pressure chamber; and a control unit 101 for supplying a drive energy of a valve body 52 to a solenoid 53. The presence or absence of an abnormality of an integrated main stop valve 5 is diagnosed by the control unit 101. As the drive energy, a valve opening energy E1 for opening a block sheet portion 511 is supplied in a valve opening operation from the fully closed state of the integrated main stop valve 5, and then, a pressure P3 in a low pressure chamber Cl is converted into a pressure regulating energy E2 for storing it in a predetermined control range during pressure regulation after valve opening. When the pressure detection value of the pressure sensor 116 arrives at the predetermined control range before the drive energy arrives at a second drive energy E2, occurrence of an abnormality of an integrated main stop valve 5 is diagnosed.SELECTED DRAWING: Figure 9

Description

  The present invention relates to a control device and abnormality diagnosis method for a high-pressure fluid control valve, and more particularly to a technique for diagnosing opening / closing failure of a valve body in a pressure control valve having both an opening / closing function and a pressure regulating function.

  Patent Document 1 includes a hydrogen tank 2, a hydrogen supply passage 3 for supplying high-pressure hydrogen gas stored in the hydrogen tank 2 to the anode electrode of the fuel cell 1, and a hydrogen supply passage 3. A fuel cell system including a control valve 4 is disclosed. The control valve 4 is for adjusting the pressure of the hydrogen gas supplied to the fuel cell 1. Further, the fuel cell system includes an on-off valve 5 that shuts off the communication between the inside of the hydrogen tank 2 and the hydrogen supply passage 3 when the power generation of the fuel cell 1 is stopped (when the power is off) (paragraphs 0013 and 0014).

JP2013-134687A

  However, in Patent Document 1, the control valve 4 is disposed in the middle of the hydrogen supply passage 3, in other words, between the high-pressure pipe 3 </ b> A and the low-pressure pipe 3 </ b> B, while the on-off valve 5 is a gas extraction part of the hydrogen tank 2, In other words, the control valve 4 and the on-off valve 5 are individually provided at the connection portion between the hydrogen tank 2 and the hydrogen supply passage 3. Here, if the function of the on-off valve and the function of the pressure regulating valve can be integrated into an integrated pressure control valve, the layout of piping and the like can be improved, and the number of parts and manufacturing cost can be reduced. Furthermore, in consideration of actual operation, it is required to establish a method for diagnosing a valve body opening / closing failure. It is particularly important to be able to detect an abnormality that has occurred in the on-off valve, because a part of the downstream side of the pressure control valve may be subjected to pressure exceeding an allowable range due to fluid leakage through the on-off valve.

  Accordingly, an object of the present invention is to make it possible to diagnose the opening / closing failure of a valve body in a high-pressure fluid control valve having both an opening / closing function and a pressure regulating function, thereby enhancing the practicality of the high-pressure fluid control valve.

  In one embodiment of the present invention, a control device for a high-pressure fluid control valve is provided. A control device according to one embodiment includes a valve body, a housing that houses the valve body, and a solenoid that drives the valve body, and the housing has a high pressure chamber that communicates with the primary port, and a low pressure that communicates with the secondary port. And an intermediate chamber between the high-pressure chamber and the low-pressure chamber, and a shut-off sheet portion between the high-pressure chamber and the intermediate chamber, A pressure adjusting sheet portion having a smaller seat diameter than the blocking sheet portion is provided between the low pressure chamber and the pressure adjusting sheet portion is opened after the blocking sheet portion when the valve is opened from the fully closed state. It is the control apparatus of the high-pressure fluid control valve which controls the high-pressure fluid control valve comprised in this. In this embodiment, a pressure sensor that detects the pressure in the low pressure chamber, a control unit that supplies drive energy for driving the valve body to the solenoid, and an abnormality diagnosis unit that diagnoses the presence or absence of an abnormality in the high pressure fluid control valve, After the first drive energy is provided by the control unit to open the shut-off sheet portion during the opening operation from the fully closed high pressure fluid control valve as the drive energy, the pressure in the low pressure chamber is increased after the valve is opened. The pressure is switched to the second driving energy smaller than the first driving energy to be within a predetermined control range at the time of pressure regulation, and the pressure of the pressure sensor before the driving energy reaches the second driving energy by the abnormality diagnosis unit. When the detected value reaches a predetermined control range, it is diagnosed that an abnormality has occurred in the high-pressure fluid control valve.

  According to the present invention, since it is possible to diagnose the presence or absence of an abnormality in the high-pressure fluid control valve, proper operation of the high-pressure fluid control valve can be achieved and its practicality can be improved.

FIG. 1 is an overall configuration diagram of a fuel cell system to which a high-pressure fluid control valve according to an embodiment of the present invention is applied. FIG. 2 is a schematic cross-sectional view showing the overall configuration of the high pressure fluid control valve. FIG. 3 is an enlarged cross-sectional view showing a configuration of a main part of the high pressure fluid control valve. FIG. 4 is an explanatory view schematically showing the operation when the high pressure fluid control valve is opened from the fully closed state. FIG. 5 is an explanatory diagram showing a change in the seat pressure according to the position of the valve body in the opening direction. FIG. 6 is an explanatory diagram showing a change in drive energy supplied to the solenoid during the valve opening operation from the fully closed state. FIG. 7 is an explanatory view schematically showing the contents of abnormality diagnosis according to an embodiment of the present invention. FIG. 8 is an explanatory view schematically showing the contents of abnormality diagnosis according to an embodiment of the present invention. FIG. 9 is a flowchart showing the flow of abnormality diagnosis as described above. FIG. 10 is a flowchart showing the flow of abnormality diagnosis as described above.

  Embodiments of the present invention will be described below with reference to the drawings.

(Overall configuration of fuel cell system)
FIG. 1 shows a configuration of a fuel cell system 1 to which a high-pressure fluid control valve 5 according to a first embodiment of the present invention is applied, focusing on an anode system.

  The fuel cell system 1 according to the present embodiment roughly includes a fuel cell 10, a cathode gas supply / discharge mechanism 12, and an anode gas supply / discharge mechanism 14. The fuel cell 10 constitutes a power generation device. The cathode gas supply / discharge mechanism 12 is a mechanism that supplies an oxidant to the cathode electrode of the fuel cell 10 and discharges the cathode off-gas after the power generation reaction from the fuel cell 10. The anode gas supply / discharge mechanism 14 supplies fuel to the anode electrode of the fuel cell 10, supplies the anode off-gas after the power generation reaction again to the anode electrode, and partially supplies the anode off-gas as needed in the fuel cell system 1. It is a mechanism for discharging to the outside.

  The fuel cell system 1 further includes a load device (not shown), and appropriately includes facilities necessary for the operation of the fuel cell 10 such as a heating / cooling mechanism. In the present embodiment, the fuel cell system 1 is mounted on a vehicle, and the load device is specifically an electric motor for running the vehicle. The fuel cell 10 constitutes a drive source for the fuel cell vehicle, and generates electric power necessary for traveling of the vehicle in addition to electric power supplied to the electric motor.

  The fuel cell 10 is configured by laminating fuel cell cells that are configured by sandwiching a membrane electrode assembly between a pair of separators, and is supplied with air through a cathode gas supply / exhaust mechanism 12 and also supplied with an anode gas. Hydrogen gas is supplied through the mechanism 14, and power is generated by a chemical reaction between oxygen and hydrogen in the air. In this embodiment, hydrogen is the fuel and oxygen in the air is the oxidant. Hydrogen gas is supplied from a high-pressure hydrogen tank 141 described later, and air is taken from the atmosphere through a compressor (not shown) or the like. Electricity generated by the power generation is supplied to an electric motor for running the vehicle and used for driving the electric motor.

  The cathode gas supply / discharge mechanism 12 includes a cathode gas supply passage 121 and a cathode gas discharge passage 122. The cathode gas supply passage 121 is a passage through which air supplied to the cathode electrode of the fuel cell 10 flows, and the cathode gas discharge passage 122 is a passage through which cathode off-gas discharged from the fuel cell 10 flows. Air in the atmosphere is supplied to the cathode electrode of the fuel cell 10 via the cathode gas supply passage 121, and cathode off-gas is released to the outside of the fuel cell system 1 via the cathode gas discharge passage 122.

  The anode gas supply / discharge mechanism 14 includes a high-pressure hydrogen tank 141, an anode gas supply passage 142, and an anode off-gas circulation passage 143. The high-pressure hydrogen tank 141 is a high-pressure gas container that stores the hydrogen gas supplied to the anode electrode of the fuel cell 10 while maintaining the high-pressure state. The anode gas supply passage 142 is a passage through which hydrogen gas supplied to the anode electrode of the fuel cell 10 flows. Between the gas outlet of the high-pressure hydrogen tank 141 and the gas inlet of the anode electrode of the fuel cell 10. It is connected. The anode gas supply passage 142 includes a first fuel supply pipe 142a upstream of the ejector 145, which will be described later, and a second fuel supply pipe 142b downstream of the ejector 145. The anode off gas circulation passage 143 is a passage for supplying again the anode off gas discharged from the fuel cell 10 to the anode electrode, and is provided between the gas outlet of the anode electrode of the fuel cell 10 and the anode gas supply passage 142. It is connected to the.

  An integrated main stop valve 5, which is a “high pressure fluid control valve” according to the present embodiment, is attached to the gas outlet of the high pressure hydrogen tank 141. The integrated main stop valve 5 has an opening / closing function for blocking communication between the inside of the high-pressure hydrogen tank 141 and the anode gas supply passage 142, and a pressure reducing or pressure regulating function for controlling the pressure of hydrogen gas sent to the anode gas supply passage 142. It is what you have. The hydrogen gas stored in the high-pressure hydrogen tank 141 is sent to the anode gas supply passage 142 under the control of the integrated main stop valve 5 during the opening of the integrated main stop valve 5, and passes through the anode gas supply passage 142. It is supplied to the anode electrode of the fuel cell 10.

  Further, an ejector 145 is installed at a connection portion between the anode gas supply passage 142 and the anode off-gas circulation passage 143, and the hydrogen gas sent to the anode gas supply passage 142 is supplied to the nozzle portion of the ejector 145. On the other hand, the anode offgas containing hydrogen remaining without contributing to the power generation reaction at the anode electrode of the fuel cell 10 and impurities such as moisture and nitrogen leaked from the cathode electrode to the anode electrode during the power generation reaction is the anode offgas. It is supplied to the ejector 145 through the circulation passage 143. The anode off gas is sucked into the anode gas supply passage 142 under the action of a negative pressure formed by the jet of hydrogen gas through the nozzle portion inside the ejector 145, and is circulated to the anode electrode of the fuel cell 10 together with this hydrogen gas. The

  In the present embodiment, an anode offgas discharge passage 144 is connected to the anode offgas circulation passage 143. A part of the anode off-gas flows into the anode off-gas discharge passage 144 from the anode off-gas circulation passage 143 as required for discharging impurities from the fuel cell system 1, and the fuel cell system 1 passes through the anode off-gas discharge passage 144. It is discharged outside.

(Basic configuration of control system)
In the present embodiment, the operation of the fuel cell 10 is controlled by the control unit 101. The control unit 101 is configured as an electronic control unit including a central processing unit, a storage device, an input / output interface, and the like, and for operation control of the fuel cell 10, an operation request to the fuel cell system 1 and an actual operation of the fuel cell 10 Signals are input from various sensors 111 to 117 that detect the state.

  The accelerator sensor 111 outputs a signal indicating the amount of depression of the accelerator pedal by the driver of the vehicle. The HFR measuring device 112 outputs a signal indicating the degree of wetness (HFR measured value) of the electrolyte membrane constituting the cell of the fuel cell 10. The stack current sensor 113 outputs a signal indicating the current actually generated by the fuel cell 10. Furthermore, the start switch 114 outputs a signal indicating start and stop commands for the fuel cell system 1 in accordance with a driver's key operation.

  The tank pressure sensor 115 is installed in the high-pressure hydrogen tank 141 and detects the pressure inside the high-pressure hydrogen tank 141, in other words, the pressure of hydrogen gas stored in the high-pressure hydrogen tank 141. The upstream pressure sensor 116 is installed in the first fuel supply pipe 142 a of the anode gas supply passage 142 and detects the pressure of hydrogen gas supplied to the ejector 145. The downstream pressure sensor 117 is installed in the second fuel supply pipe 142b of the anode gas supply passage 142, and detects the pressure of the anode gas sent from the ejector 145, in other words, the mixed gas of hydrogen gas and anode off gas. .

  The control unit 101 executes a predetermined calculation related to the operation control of the fuel cell 10 based on various input signals. Specifically, the target generated power of the fuel cell 10 is calculated and a drive signal is output to the integrated main stop valve 5. And in this embodiment, when there exists a starting command with respect to the fuel cell system 1, the control which opens the integrated main stop valve 5 in a fully-closed state is performed.

(Overall configuration of high-pressure fluid control valve)
FIG. 2 is a cross-sectional view showing the overall configuration of the integrated main stop valve 5 which is a high-pressure fluid control valve according to the present embodiment. The integrated main stop valve 5 has both an opening / closing function and a pressure adjusting function, and is attached to the gas outlet of the high-pressure hydrogen tank 141. The overall configuration of the integrated main stop valve 5 will be described with reference to FIG.

  The integrated main stop valve 5 includes a housing 51, a valve body 52, and a solenoid 53.

  The housing 51 has a high-pressure side port (hereinafter referred to as “primary port”) p1 and a low-pressure side port (hereinafter referred to as “secondary port”) p2, and the primary port p1 is provided inside the high-pressure hydrogen tank 141. The secondary ports p2 are fluidly connected to the anode gas supply passage 142, respectively. The hydrogen gas stored in the high-pressure hydrogen tank 141 is introduced into the integrated main stop valve 5 from the primary port p1 and is subjected to a pressure reducing or pressure adjusting action in accordance with the position of the valve body 52 inside the housing 51. The gas is sent from the next port p2 to the anode gas supply passage 142. In the present embodiment, the pressure of the hydrogen gas stored in the high-pressure hydrogen tank 141 is set to several MPa to several tens of MPa (for example, 1 to 70 MPa). As a result of pressure regulation, the secondary port p2 has several kPa. To about 1 MPa (for example, 0.005 to 0.2 MPa when there is no ejector 145). The pressure of the hydrogen gas at the primary port p1 is called “primary pressure”, and the pressure at the secondary port p2 is called “secondary pressure”.

  A high pressure chamber Ch, an intermediate chamber Cm, and a low pressure chamber Cl are formed in the housing 51 in order from the upstream side with respect to the direction in which the hydrogen gas flows, as spaces that define different pressures regarding the operation of the integrated main stop valve 5. ing. The high-pressure chamber Ch communicates with the primary port p1 and is a space into which hydrogen gas having a primary pressure P1 is introduced. Here, the pressure in the high pressure chamber Ch is set to a pressure P1 equal to the primary pressure. The low pressure chamber Cl is a space that communicates with the secondary port p2 and allows the hydrogen gas having the reduced secondary pressure P2 to pass through. The pressure of the low pressure chamber Cl is set to a pressure P3 equal to the secondary pressure. The intermediate chamber Cm is a space interposed between the high pressure chamber Ch and the low pressure chamber Cl. Inside the housing 51, a blocking sheet portion 511 is further formed between the high pressure chamber Ch and the intermediate chamber Cm, and a pressure adjusting sheet portion 512 is formed between the intermediate chamber Cm and the low pressure chamber Cl.

  The valve body 52 regulates the flow of hydrogen gas from the primary port p1 to the secondary port p2, and is accommodated inside the housing 51 so as to be capable of reciprocating in the axial direction. In the present embodiment, the valve body 52 is embodied as a spool-like valve body that slides in the axial direction, and shuts off the communication between the high-pressure chamber Ch and the intermediate chamber Cm in the fully closed state shown in FIG. The communication between the intermediate chamber Cm and the low pressure chamber Cl is blocked.

  The valve body 52 includes a main shaft portion 521 formed in a cylindrical shape, a first rod-shaped portion 522 extending in the axial direction from one end of the main shaft portion 521, and a first rod-shaped portion 522 from the other end of the main shaft portion 521. A second rod-shaped portion 523 extending in the reverse direction. The valve body 52 further includes a blocking portion 524 extending in the radial direction from the vicinity of the middle portion of the main shaft portion 521, and a pressure adjusting portion 525 extending in the radial direction from the vicinity of the proximal end portion of the main shaft portion 521. Prepare.

  The main shaft portion 521 extends from the high-pressure chamber Ch to the intermediate chamber Cm on one end side, and is set to a length that extends to the valve body guide hole 51a of the housing 51 on the other end side. The first rod-shaped portion 522 extends from one end of the main shaft portion 521 to the distal end side and is set to a length penetrating one side wall of the housing 51, and the second rod-shaped portion 523 is proximal to the other end of the main shaft portion 521. And is set to a length penetrating the other side wall of the housing 51. The first rod-like portion 522 and the second rod-like portion 523 are slidably supported with respect to the annular seal member installed on the inner wall of the housing 51, so that the entire valve body 52 is supported with respect to the housing 51. . Further, an annular seal member 526 is installed on the inner wall of the housing 51 that forms the valve element guide hole 51a, and the main shaft portion 521 is slidably supported by the annular seal member 526. An additional support is formed on the valve body 52. Here, the annular seal member 526 and the main shaft portion 521 slidably in contact therewith form a “sliding seal portion” that seals the high-pressure chamber Ch from the outside of the housing 51.

  The blocking portion 524 is formed in an annular shape in a cross section perpendicular to the central axis of the valve body 52, and is in contact with the blocking sheet portion 511 when fully closed with respect to the housing 51. The pressure adjusting unit 525 is provided on the base end side with respect to the blocking unit 524, and is formed in an annular shape having a narrower width than the blocking unit 524 in a cross section perpendicular to the central axis of the valve body 52. The pressure adjusting unit 525 is in contact with the pressure adjusting sheet portion 512 when the housing 51 is fully closed. When the blocking portion 524 contacts the blocking sheet portion 511, the communication between the high pressure chamber Ch and the intermediate chamber Cm is blocked, and when the pressure adjusting portion 525 contacts the pressure adjusting sheet portion 512, the intermediate chamber Cm and the low pressure chamber Communication with Cl is blocked.

  The solenoid 53 electromagnetically drives the valve body 52, and is disposed adjacent to the proximal end side of the valve body 52 with respect to the housing 51.

  The solenoid 53 includes an electromagnetic coil 531, and a plunger 532 arranged concentrically on the inner side of the electromagnetic coil 531, and the plunger 532 receives the electromagnetic force generated by the electromagnetic coil 531 and moves linearly. The electromagnetic coil 531 and the plunger 532 are accommodated in a solenoid case 533, and the solenoid case 533 is fixed to the housing 51 via a holder 534. The solenoid 53 generates electromagnetic force when the energization of the electromagnetic coil 531 is turned on, and drives the plunger 532. The movement of the plunger 532 is transmitted to the valve body 52 via the second rod-shaped portion 523, and the valve body 52 is driven in the opening direction. Then, the blocking sheet portion 511 and the pressure regulating sheet portion 512 are opened according to the amount of movement of the valve body 52, in other words, the position of the valve body 52 in the opening direction.

  In the present embodiment, a valve return mechanism 54 is provided adjacent to the distal end side of the valve body 52 with respect to the housing 51. The valve return mechanism 54 elastically biases the valve body 52 from the side opposite to the solenoid 53, and when the energization to the electromagnetic coil 531 is turned off, the valve body 52 is driven in the closing direction. Return to the fully closed position.

  The valve return mechanism 54 includes a spring 541, a retainer 542 attached to the tip of the valve body 52, and a holder 543 installed on the opposite side of the spring 541 with respect to the retainer 542. The spring 541 is accommodated in the spring case 544 together with the retainer 542 and the holder 543, and the spring case 544 is directly fixed to the housing 51. With the spring case 544 fixed to the housing 51, the spring 541 is in a compressed state between the retainer 542 and the holder 543. Further, a disc-shaped diaphragm 545 is provided so as to be sandwiched between the valve body 52 and the retainer 542, and the outer periphery of the diaphragm 545 is sandwiched between the housing 51 and the spring case 543. The pressure P3 or the secondary pressure of the low pressure chamber Cl is introduced into the pressure chamber Cp of the valve return mechanism 54 through the pressure feedback passage 513, and this feedback pressure acts on the valve body 52 through the diaphragm 545. The driving force in the closing direction for 52 is assisted. In the present embodiment, the spring 541 is employed as a generation source of the driving force for returning the valve body 52 to the fully closed position. However, other elastic bodies such as rubber may be employed instead of the spring 541. Not only the body but also permanent magnets can be used.

  On / off of energization to the electromagnetic coil 531 is controlled by the control unit 101.

(Main part of high pressure fluid control valve)
FIG. 3 shows a configuration of a main part of the integrated main stop valve 5 in a cross section parallel to the central axis of the valve body 52, and FIG. 4 shows a valve opening operation from the fully closed state of the integrated main stop valve 5. It is schematically shown by the same cross section. With reference to FIG. 3 and 4, the shielding sheet part 511 and the pressure regulation sheet part 512 employ | adopted by this embodiment are further demonstrated.

  As described above, in this embodiment, the spool-shaped single valve body 52 is formed with the blocking portion 524 for realizing the opening / closing function and the pressure adjusting portion 525 for realizing the pressure adjusting function. On the other hand, a blocking sheet portion 511 that receives the blocking portion 524 and a pressure adjusting sheet portion 512 that receives the pressure adjusting portion 525 are formed in the housing 51.

  The blocking sheet portion 511 is based on the outer diameter of the valve body 52 in the sliding seal portion, in other words, the diameter (hereinafter referred to as “sliding seal diameter”) d1 of the main shaft portion 521 forming the sliding seal portion described above. Has a large sheet diameter (hereinafter referred to as “blocking sheet diameter”) d3. Here, the “blocking sheet diameter” refers to the diameter of the contact portion between the blocking portion 524 and the blocking sheet portion 511 of the valve body 52, and when the pressure receiving surface on which the primary pressure P 1 acts on the valve body 52 is determined. This is the standard size. Therefore, when the blocking portion 524 and the blocking sheet portion 511 are substantially in contact with each other instead of a line, the “blocking sheet diameter” refers to the diameter of the outer edge portion of the contact surface, in other words, the maximum diameter. .

  The blocking sheet portion 511 can be formed from, for example, a hard resin material that can ensure a predetermined blocking surface pressure. In this embodiment, such a resin material is formed into an annular shape, and this is formed into the housing 51. It is provided by being fitted to a concave part formed on the inner wall and fixed or fixed.

  The pressure adjusting sheet portion 512 has a sheet diameter (hereinafter referred to as “pressure adjusting sheet diameter”) d2 smaller than the blocking sheet diameter d3. In other words, the blocking sheet diameter d3 is set to a value larger than the pressure regulating sheet diameter d2. The pressure adjusting sheet portion 512 is not in the housing 51 itself, but is attached to the housing 51, specifically, a cylindrical slide body 515 that is a movable body, and a compressed state between the slide body 515 and the inner wall of the housing 51. And a spring body 516 installed in (1). The spring body 516 is set to exhibit elasticity that can achieve a predetermined valve closing surface pressure.

  The slide body 515 is urged in the opening direction by the spring body 516, and its tip end abuts on the pressure regulating portion 512 of the valve body 52, and the pressure regulating sheet serves as an abutting portion between the slide body 515 and the pressure regulating portion 512. A portion 512 is formed. By setting the diameter d2 of the slide body 515 at the contact portion to a value smaller than the blocking sheet diameter d3, it is possible to set the pressure regulating sheet diameter d2 that defines the relationship (d3> d2). A concave guide portion is formed on the inner wall of the housing 51 that defines the low-pressure chamber Cl, and the enlarged diameter portion provided on the proximal end side of the slide body 515 is accommodated in the concave guide portion, so that the slide body 515 is a valve body. 52 is installed in the low pressure chamber Cl so as to be movable in the opening direction. A predetermined gap g is formed between the slide body 515 and the inner wall of the housing 51 in a fully closed state. Here, since the slide body 515 is urged in the opening direction of the valve body 52 by the spring body 516, the movement of the valve body 52 during the valve opening operation is a distance corresponding to the predetermined interval g. It can be moved or displaced following the valve body 52. The pressure adjusting sheet portion 512 employs a resin material exhibiting elasticity sufficient to ensure a predetermined valve closing surface pressure regardless of the accessory parts, and forms such a resin material in an annular shape, It is also possible to form by the housing 51 itself (in other words, as a part of the housing 51) by fixing or fixing to the concave portion formed in the above. It is possible to follow the movement of the valve body 52 by restoring the shape of the pressure adjusting sheet portion 512 from the compressed state during the valve opening operation.

  Further, in the present embodiment, the pressure adjusting sheet diameter d2 is set to a value equal to the sliding seal diameter d1.

  Turning to the description of FIG. 4, FIG. 4A shows the state of the integrated main stop valve 5 when it is “fully closed”, and FIG. 4B shows the shut-off seat portion in the process of opening the valve from the fully closed state. FIG. 4 (C) shows the state in the “valve closing” state in which the pressure adjustment sheet portion 512 remains blocked even though 511 is opened. FIG. The state at the time of “valve opening” in which both 512 are opened is shown.

  The integrated main stop valve 5 controls the electric energy supplied to the solenoid 53 (hereinafter referred to as “driving energy”) to move the valve body 52 in the opening direction and the closing direction, and between the high pressure chamber Ch and the intermediate chamber Cm. The flow area (hereinafter referred to as “opening degree of the shut-off sheet part”) is controlled, and the flow area (hereinafter referred to as “opening degree of the pressure regulating sheet part”) between the intermediate chamber Cm and the low pressure chamber Cl is controlled. To do. Driving in the opening direction of the valve body 52 is based on electromagnetic force of the electromagnetic coil 531, and driving in the closing direction is based on restoring force based on the elasticity of the spring 541.

  In the fully closed state shown in FIG. 4A, the blocking portion 524 of the valve body 52 comes into contact with the blocking sheet portion 511 and the pressure adjusting portion 525 comes into contact with the pressure adjusting sheet portion 512 (the tip portion of the slide body 515). The blocking sheet portion 511 and the pressure adjusting sheet portion 512 are in a closed state, and their opening degrees are all 0 (zero). A high pressure (primary pressure) P1 is applied to the high pressure chamber Ch through the primary port p1 through the pressure inside the high pressure hydrogen tank 141. On the other hand, the pressure (secondary pressure) P3 acting on the low pressure chamber Cl is extremely lower than the primary pressure because the secondary port p2 is connected to the anode gas supply passage 142. A pressure P2 between the primary pressure P1 and the secondary pressure P3 acts on the intermediate chamber Cm. The shut-off sheet portion 511 is required to completely shut off the fluid when fully closed, whereas the pressure-adjusting sheet portion 512 has a slight leak within a range that does not hinder the safety from the viewpoint of safety. Permissible. Therefore, when a sufficient time has elapsed since the previous stop of the system 1, the pressure P2 in the intermediate chamber Cm greatly decreases from the pressure immediately after the stop, and is closer to the secondary pressure P3 than the primary pressure P1. Is in a state. Since the blocking sheet diameter d3 is larger than the sliding seal diameter d1, a force corresponding to the difference between the blocking sheet diameter d3 and the sliding seal diameter d1 acts on the valve body 52 in the closing direction based on the primary pressure P1. (Hereinafter, the force acting on the valve body 52 in the closing direction is referred to as “valve closing force”, and conversely, the force acting in the opening direction is referred to as “valve opening force”). In order to move the valve body 52 in the fully closed state in the opening direction, the electromagnetic coil 531 needs to generate an electromagnetic force that can overcome the valve closing force based on the primary pressure P1.

  When the valve shown in FIG. 4B is closed, the shut-off portion 524 of the valve body 52 is separated from the shut-off sheet portion 511 and the shut-off sheet portion 511 is opened, while the pressure regulating portion 525 is in contact with the pressure regulating seat portion 512. The opening degree of the pressure regulation sheet part 512 is still 0 by staying in contact. By opening the blocking sheet portion 511, a flow from the high pressure chamber Ch to the intermediate chamber Cm occurs, and the pressures P1 and P2 are balanced in the high pressure chamber Ch and the intermediate chamber Cm (P1 = P2). Since the pressure regulating sheet diameter (outer diameter of the slide body 515) d2 is equal to the sliding seal diameter d1, the influence of the primary pressure P1 on the valve body 52 is offset. When the valve is closed, the diameter-enlarged portion of the slide body 515 is in contact with the inner wall of the housing 51, and the valve body 52 is not affected by the elastic force of the spring body 516, so that the valve body 52 acts on the valve body 52. The force is substantially only the elastic force of the spring 541. Therefore, in order to further move the valve body 52 in the opening direction, an electromagnetic force that overcomes this relatively small valve closing force may be generated.

  At the time of valve opening shown in FIG. 4C, the pressure adjusting unit 525 is further separated from the pressure adjusting sheet unit 512 from the closed state, and both the blocking sheet unit 511 and the pressure adjusting sheet unit 512 are opened. As a result, hydrogen gas flows into the low pressure chamber Cl from the intermediate chamber Cm, and supply of hydrogen gas to the components (for example, the ejector 145) provided on the downstream side of the integrated main stop valve 5 is started. The pressure of the hydrogen gas supplied to the downstream part is controlled by adjusting the opening of the pressure regulating sheet portion 512. Since the influence of the primary pressure P1 on the valve body 52 is canceled after the blocking sheet portion 511 is opened, the valve body 52 can be moved with relatively small driving energy.

  FIG. 5 shows changes in surface pressure acting on the blocking sheet portion 511 and the pressure regulating sheet portion 512 during the valve opening operation from the fully closed state.

  In the present embodiment, during the valve opening operation, the slide body 515 follows the movement of the valve body 52 by a predetermined distance corresponding to the interval g, so that the valve body 52 starts moving as shown in FIG. Thereafter, the blocking sheet portion 511 is first opened, and then the pressure regulating sheet portion 512 is opened when the diameter-expanded portion of the slide body 515 comes into contact with the inner wall of the housing 51. The valve positions at which the blocking portion 524 and the pressure adjusting portion 525 of the valve body 52 are separated from the blocking sheet portion 511 and the pressure adjusting sheet portion 512 are indicated as “sitting points”, respectively.

  The shut-off sheet portion 511 is formed of a hard resin material, and when fully closed, a valve closing force based on the primary pressure P1 acts on the shut-off portion 524 of the valve body 52 to exceed a predetermined shut-off surface pressure. Is in contact with the blocking portion 524. When energization to the electromagnetic coil 531 is turned on and the valve opening force acting on the valve body 52 exceeds the valve closing force based on the primary pressure P1, the valve body 52 starts to move, and accordingly, the surface of the blocking sheet portion 511 Pressure decreases rapidly. After the seating point, the surface pressure of the blocking sheet portion 511 is 0 (zero).

  The pressure adjusting sheet portion 512 includes a slide body 515 and a spring body 516, and the spring body 516 is set to exhibit elasticity that can achieve a predetermined valve closing surface pressure. Therefore, when fully closed, the slide body 515 is pressed against the pressure adjusting portion 525 of the valve body 52 with a surface pressure exceeding a predetermined valve closing surface pressure by the elastic force of the spring body 516. As the slide body 515 moves following the valve body 52, the amount of displacement of the spring body 516 decreases and the elastic force decreases, so the surface pressure of the pressure adjusting sheet portion 512 also decreases. The decrease in the surface pressure of the pressure adjusting sheet portion 512 is more gradual than that of the blocking sheet portion 511. After the seating point, the surface pressure of the pressure-adjusting sheet portion 512 is also zero as with the blocking sheet portion 511. In the present embodiment, the surface pressure immediately after the pressure adjusting portion 525 of the valve body 52 is seated on the pressure adjusting seat portion 512 or immediately before being separated is defined as the valve closing surface pressure.

  During the valve closing operation from the valve opening, the surface pressures of the shut-off sheet portion 511 and the pressure regulating sheet portion 512 exhibit changes opposite to those during the valve opening operation. However, since the spring 541 of the valve return mechanism 54 cannot generate a valve closing force that resists the repulsive force of the blocking sheet portion 511, the surface pressure after the blocking portion 524 is seated on the blocking sheet portion 511 is reduced. The increase corresponds to an increase in the differential pressure between the high pressure chamber Ch and the intermediate chamber Cm.

(Energization control for solenoid)
FIG. 6 shows a change in drive energy supplied to the solenoid 53 during the valve opening operation from the fully closed state.

  At time t0, the energization of the solenoid 53 is stopped, and the driving energy supplied to the solenoid 53 is 0 (zero). In this state, the valve body 52 is in the valve stop position shown in FIG. From time t0, energization to the solenoid 53 is started, the drive energy is increased, and the valve body 52 is driven in the opening direction.

  As described above, in order to move the valve body 52 in the fully closed state in the opening direction, the electromagnetic coil 531 needs to generate an electromagnetic force sufficient to overcome the valve closing force based on the primary pressure P1. Therefore, in the period A after the start of the operation, the driving energy is suddenly increased from 0 (time t0 to t1), and the valve opening force based on the primary pressure P1 is supplied by supplying a large valve opening energy E1 to the solenoid 53. A large valve opening force is generated to overcome the above. The valve opening energy E1 corresponds to “first driving energy”. The magnitude of the valve opening energy E1 is changed according to the primary pressure P1, in other words, the pressure inside the high-pressure hydrogen tank 141. Specifically, the valve opening energy E1 is increased as the storage amount or remaining capacity of the high-pressure hydrogen tank 141 is larger and the primary pressure P1 is higher. After the drive energy reaches the valve opening energy E1, the valve opening energy E1 is maintained for a predetermined time Δtx1 (time t1 to t2).

  When the valve body 52 starts moving and a slight gap is generated between the blocking portion 524 and the blocking sheet portion 511, a flow from the high pressure chamber Ch to the intermediate chamber Cm occurs, and the pressure P2 in the intermediate chamber Cm increases. . As the pressure difference between the high pressure chamber Ch and the intermediate chamber Cm decreases, the valve closing force decreases. In a state where the pressure is balanced between the high-pressure chamber Ch and the intermediate chamber Cm (P1 = P2), the influence of the primary pressure P1 on the valve body 52 is canceled out, and the valve body 52 is relatively large enough to overcome the elastic force of the spring 541. It can be moved with a small opening force. Nevertheless, if the large drive energy is maintained even after the pressures P1 and P2 are balanced, the valve body 52 moves at a stroke due to the excessive valve opening force, and not only the blocking sheet portion 511 but also the original state. Even the pressure adjusting seat portion 512 that must be kept shut off is greatly opened, the secondary pressure P3 rises rapidly, and the components provided on the downstream side of the integrated main stop valve 5 have an allowable range. There is a risk of applying pressure exceeding. Therefore, as the valve body 52 starts to move and the blocking portion 524 starts to move away from the blocking sheet portion 511, the drive energy is decreased from the valve opening energy E1, and the pressure adjustment is significantly smaller than the valve opening energy E1. Switch to energy E2. In the present embodiment, the drive energy starts to decrease at a time t2 when a predetermined time Δtx1 has elapsed from the time t1 when the drive energy reaches the valve opening energy E1, and the pressure adjustment sheet unit 512 starts the pressure adjustment operation after the start-up is completed. Switching to pressure regulation energy E2 smaller than upper limit energy E2max during pressure regulation with the opening degree being the maximum opening degree (time t4). The pressure adjustment energy E2 corresponds to “second driving energy”.

  In the present embodiment, when the drive energy is switched from the valve opening energy E1 to the pressure adjustment energy E2, the pressure adjustment energy via the drive suppression energy E3 that is smaller than the pressure adjustment energy E2 and smaller than the pressure adjustment lower limit energy E2min. Transition to E2 (time t3). The drive suppression energy E3 corresponds to “third drive energy”. The magnitude of the drive suppression energy E3 is changed according to the tank pressure Ptnk, and the drive suppression energy E3 is decreased as the tank pressure Ptnk is higher and the valve opening energy E1 is larger. The pressure regulation lower limit energy E2min refers to pressure regulation energy in which the opening degree of the pressure regulation sheet part 512 is set to 0 during pressure regulation operation after completion of startup.

  After the drive energy is switched, the pressure adjustment energy E2 is increased or decreased to adjust the pressure on the downstream side of the integrated main stop valve 5, and the supply flow rate of hydrogen gas to the fuel cell 10 is controlled. Specifically, the downstream pressure of the integrated main stop valve 5 is detected by the upstream pressure sensor 116, and the pressure is adjusted within the range of the upper limit energy E2max and the lower limit energy E2min so that the detected pressure value approaches the target value of the downstream pressure. Control energy E2. In other words, the pressure P3 of the low-pressure chamber Cl is within a predetermined control range at the time of pressure regulation after the valve opening. And when stopping the fuel cell system 1, drive energy is set to 0 and the energization to the electromagnetic coil 531 is stopped (time t5).

(Contents of abnormality diagnosis)
The abnormality diagnosis is performed every time the integrated main stop valve 5 in the fully closed state is opened. In the present embodiment, the abnormality diagnosis is performed every time the fuel cell system 1 is activated. However, it may be executed irrespective of the operation by the driver when the fuel cell system 1 is stopped or during the stop, instead of or at the start. The control unit 101 is supplied with a signal indicating the pressure upstream of the integrated main stop valve 5 from the tank pressure sensor 115, in other words, a signal indicating the pressure inside the high-pressure hydrogen tank 141 (tank pressure Ptnk). A signal indicating the pressure of the first fuel supply pipe 142a is input from the sensor 116. The pressure detection value of the upstream pressure sensor 116 indicates the pressure P3 of the low pressure chamber Cl. The control unit 101 executes energization control for the solenoid 53 based on the input signal. Based on the detected pressure value of the upstream pressure sensor 116, the presence or absence of an abnormality in the integrated main stop valve 5 is diagnosed based on the comparison with the drive energy.

What is targeted for diagnosis in the present embodiment is the following abnormalities (1) to (6).
(1) Valve closing failure of shut-off unit 524 (2) Valve closing failure of pressure regulating unit 525 (3) Valve closing failure of shut-off unit 524 and pressure regulating unit 525 (4) Valve opening failure of shut-off unit 524 (5) Defective valve opening of the pressure part 525 (6) Defective valve opening of the shut-off part 524 and the pressure regulating part 525 Here, “valve closing fault” means that the valve body 52 is in an open fixed state and the predetermined shut-off surface pressure or closed Abnormality when valve surface pressure is not fully closed means “valve opening” means that valve body 52 is in a closed and fixed state, and a predetermined driving energy is supplied to solenoid 53 to generate a corresponding valve opening force. It means an abnormality when the valve is not opened even if it is allowed to. In the present embodiment, the presence / absence of all the abnormalities (1) to (6) is diagnosed every time the fuel cell system 1 is activated. However, only some abnormalities may be diagnosed. . For example, the abnormalities (1), (3), (4), and (6) related to the blocking unit 524 are targeted.

  7 and 8 show changes in the pressure P3 of the low-pressure chamber Cl when an abnormality occurs in the integrated main stop valve 5. FIG. FIG. 7 shows a case where the abnormalities (1) to (3) have occurred, and FIG. 8 shows a case where the abnormalities (4) to (6) have occurred.

  7 and 8, changes in the pressures P2 and P3 of the intermediate chamber Cm and the low-pressure chamber Cl when the integrated main stop valve 5 is not operating abnormally and are operating normally are indicated by thick dotted lines, respectively. Under normal conditions, when the valve opening energy E1 is supplied to the solenoid 53, the valve body 52 starts moving in the opening direction in accordance with an increase in the valve opening force. When a gap is generated between the blocking portion 524 and the blocking sheet portion 511, a flow from the high pressure chamber Ch to the intermediate chamber Cm occurs, and the pressure P2 in the intermediate chamber Cm increases. When the pressure is balanced between the high pressure chamber Ch and the intermediate chamber Cm, the influence of the primary pressure P1 on the valve body 52 is offset, and thereafter, the valve body 52 can be moved with a relatively small valve opening force. Therefore, the valve body 52 further moves, and the pressure adjusting unit 525 is separated from the pressure adjusting sheet unit 512. Along with this, a flow from the intermediate chamber Cm to the low pressure chamber Cl occurs, and the pressure P3 of the low pressure chamber Cl increases. The pressure P3 in the low-pressure chamber Cl continues to rise during the transition from the drive suppression energy E3 to the pressure adjustment energy E2, and at time t4 when the drive energy reaches the pressure adjustment energy E2, the control range of the pressure P3 during pressure adjustment ( A predetermined pressure P3l that defines the lower limit of P3l to P3h) is reached.

  FIG. 7 shows the tendency of the change seen in the pressure P3 of the low pressure chamber Cl when the abnormality (1) to (3) occurs in the integrated main stop valve 5 by thick solid lines A to C, respectively. . When the pressure P3 in the low pressure chamber Cl is detected by the upstream pressure sensor 116 and the detected pressure value reaches a predetermined lower limit pressure P31 before the drive energy reaches the pressure regulation energy E2, the blocking portion of the valve body 52 is detected. It is determined that at least one of 524 and the pressure adjusting unit 525 has a valve closing failure, and the blocking sheet portion 511 or the pressure adjusting sheet portion 512 is not closed with sufficient surface pressure.

(1) Defective valve closing of the shut-off portion 524 If the pressure-adjusting portion 525 is normal, but the shut-off portion 524 is defective, the shut-off surface pressure sufficient for the shut-off sheet portion 511 even when fully closed. Is not applied, leakage occurs between the high-pressure chamber Ch and the intermediate chamber Cm, and the pressures P1 and P2 are almost balanced. Therefore, since the influence of the primary pressure P1 on the valve body 52 has already been reduced at the time t0 when the supply of drive energy to the solenoid 53 is started, the valve body 52 moves immediately after the start of supply of drive energy and is shut off. The sheet part 511 is opened. Since the pressure regulating unit 512 is operating normally, immediately after the supply of drive energy is started, the pressure P3 of the low-pressure chamber Cl does not rise, but the valve body 52 further moves and the drive energy becomes the valve opening energy. The pressure regulating sheet portion 512 is opened by time t1 when reaching E1. Therefore, in this case, as indicated by the thick line A in FIG. 7, after the drive energy supply is started and before the drive energy reaches the valve opening energy E1, a predetermined range SLp is set to the pressure P3 of the low pressure chamber Cl. An increase will occur. The predetermined range SLp is an index for determining the occurrence of a substantial pressure increase in the low pressure chamber Cl.

(2) Defective valve closing of the pressure adjusting unit 512 If the blocking unit 524 is normal but a defective valve closing occurs in the pressure adjusting unit 525, the blocking sheet unit 511 is sufficient regardless of the abnormality of the pressure adjusting unit 525. Therefore, the valve closing force based on the primary pressure P1 acts on the valve body 52 when fully closed. Therefore, after the driving energy reaches the valve opening energy E1, the valve body 52 moves, and accordingly, a flow from the high pressure chamber Ch to the intermediate chamber Cm occurs, and the pressure P2 in the intermediate chamber Cm increases. Here, a valve closing failure has occurred in the pressure adjusting section 525, and a sufficient valve closing surface pressure has not acted on the pressure adjusting seat section 512. Therefore, as the pressure in the intermediate chamber Cm increases, the low pressure chamber Cl The pressure P3 also increases. Therefore, in this case, as indicated by the thick line B in FIG. 7, after supplying the valve opening energy E1 to the solenoid 53, the pressure P3 of the low pressure chamber Cl originally reaches the lower limit pressure P31 during the pressure adjustment. It arrives at a time earlier than the time t4. In the present embodiment, after the drive energy is reduced from the valve opening energy E1, the transition is made to the pressure adjustment energy E2 via the drive suppression energy E3, and the time when the pressure P3 of the low pressure chamber Cl reaches the lower limit pressure P3l. This is before the time t3 when the drive energy reaches the drive suppression energy E3.

(3) Insufficient valve closing of the shut-off unit 524 and the pressure adjusting unit 525 In addition to the shut-off unit 524, if there is a poor valve closing in the pressure adjusting unit 525, either the shut-off sheet unit 511 or the pressure regulating sheet unit 512 On the other hand, since sufficient surface pressure is not applied, supply of driving energy to the solenoid 53 is started, and immediately after the valve body 52 moves, the pressure P3 of the low pressure chamber Cl increases. Therefore, in this case, as indicated by the thick line C in FIG. 7, the increase in the pressure P3 exceeding the predetermined range SLp is earlier than when the valve closing failure occurs only in the blocking part 524 (thick line A). Specifically, it occurs immediately after the start of the supply of drive energy.

  FIG. 8 shows the tendency of the change seen in the pressure P3 of the low pressure chamber Cl when the abnormality (4) to (6) occurs in the integrated main stop valve 5 by the thick solid lines D to F, respectively. . In the diagnosis of these abnormalities, the pressure detection value after time t1 when the valve opening energy E1 is supplied, in this embodiment, the pressure detection value after time t4 when the drive energy reaches the pressure adjustment energy E2 is monitored. Specifically, when the pressure P3 of the low pressure chamber Cl does not rise beyond a predetermined range even after time t4, at least one of the shut-off part 524 and the pressure regulating part 525 of the valve body 52 has a valve opening failure. Therefore, it is determined that the valve body 52 remains closed even when the valve opening energy E1 is supplied.

(4) Valve Opening Failure of the Blocking Unit 524 If the valve opening failure occurs in the blocking unit 524 and the blocking sheet unit 511 is not opened even by the supply of the valve opening energy E1, for example, the pressure adjusting unit 525 Even if it is operating normally, the pressure P3 of the low-pressure chamber Cl does not increase, and the pressure before supplying drive energy is maintained. Therefore, in this case, as shown by the thick line D in FIG. 8, even after the drive energy reaches the pressure adjustment energy E2, the pressure P3 of the low pressure chamber Cl does not increase or change.

(5) Valve opening failure of the pressure adjusting unit 525 When the blocking unit 524 is normal but the valve opening failure occurs in the pressure adjusting unit 525, the valve body 52 is moved by the supply of the valve opening energy E1 and is blocked. Even after the sheet portion 511 is opened, the pressure regulating sheet portion 512 is kept closed. Here, the blockage of the pressure adjusting sheet portion 512 is due to the contact between the pressure adjusting portion 525 and the tip of the slide body 515, and the surface pressure applied to the pressure adjusting sheet portion 512 causes the slide body 515 to be in the valve body 52. Because of the elastic force of the spring body 516 biased in the opening direction, even if the pressure adjusting sheet portion 512 is in a closed state, a slight leak occurs through the pressure adjusting portion 525 (hereinafter referred to as “this”). A slight leak is called "slow leak"). Therefore, in this case, as indicated by the thick line E in FIG. 8, after the blocking sheet portion 511 is opened, the pressure P3 in the low pressure chamber Cl only rises due to this slow leak, and the pressure regulating sheet portion 512 There will be no substantial rise that can be determined to be due to the opening of the.

(6) Valve Opening Failure of the Blocking Unit 511 and the Pressure Adjusting Unit 512 This is the same as when the valve opening failure occurs in the blocking unit 524, and as shown by the thick line F in FIG. Even after reaching, the pressure P3 of the low pressure chamber Cl does not increase or change.

  9 and 10 are flowcharts showing the basic flow of abnormality diagnosis.

  The presence or absence of abnormalities (1) and (2) is diagnosed by the routine shown in FIG. 9, and the presence or absence of abnormalities (3) to (6) is diagnosed by the routine shown in FIG. The abnormality diagnosis is executed every time the fuel cell system 1 is started up by the control unit 101, and when any abnormality is detected, the control unit 101 notifies the driver of the occurrence of the abnormality by operating a warning light or the like. . The supply of power to the solenoid 53 may be stopped immediately and the start of the fuel cell system 1 may be stopped.

  In FIG. 9, in S101, the valve opening energy E1 is read, the valve opening energy E1 is supplied to the solenoid 53, and the valve body 52 is driven. Specifically, the tank pressure Ptnk is detected, the valve opening energy E1 corresponding to the tank pressure Ptnk is read, and the drive energy is increased from 0 to the valve opening energy E1 within an extremely short time. The valve opening energy E1 is set to a larger value as the tank pressure Ptnk is higher. The time taken to increase the drive energy to the valve opening energy E1 is, for example, within 1 second.

  In S102, it is determined whether or not the current routine is the first time after starting the supply of drive energy. If it is the first time, the process proceeds to S103, and if it is the second time or later, the process proceeds to S105.

  In S103, it is determined whether or not the pressure P3 of the low pressure chamber Cl has risen beyond a predetermined range. This determination is based on, for example, determining whether or not an increase ΔP3 of the pressure P3 of the low-pressure chamber Cl with respect to the supply of driving energy is greater than a predetermined threshold SLp. If it is larger than the predetermined threshold value SLp, the process proceeds to S104. If it is equal to or smaller than the predetermined threshold value SLp, the process returns to S102, and S102 and subsequent processes are repeated.

  In S104, it is determined that both the shut-off unit 524 and the pressure regulating unit 525 have a valve closing failure.

  In S105, as in S103, it is determined whether or not the pressure P3 of the low pressure chamber Cl has risen beyond a predetermined range. Specifically, it is determined whether or not the increase amount ΔP3 of the pressure P3 of the low-pressure chamber Cl with respect to the supply of drive energy is larger than a predetermined threshold value SLp. When it is larger than the predetermined threshold value SLp, the process proceeds to S106, and when it is equal to or smaller than the predetermined threshold value SLp, the process proceeds to S107.

  In S106, it is determined that a valve closing failure has occurred in the blocking unit 524.

  In S107, it is determined whether the time t1 shown in FIG. 6 has elapsed, in other words, whether the driving energy has reached the valve opening energy E1. If the valve opening energy E1 has been reached, the process proceeds to S201 shown in FIG. 10, and if it has not reached, the process proceeds to S102, and S102 and subsequent processes are repeated.

  Turning to FIG. 10, in S201, the drive suppression energy E3 corresponding to the tank pressure Ptnk is read, and the drive energy E is reduced from the valve opening energy E1 to the drive suppression energy E3 within a predetermined time. The time taken to reduce the drive energy E to the drive suppression energy E3 may be as short as possible, for example, about 0.1 to 0.2 seconds.

  In S202, it is determined whether or not the time t3 has elapsed, in other words, whether or not the driving energy has reached the driving suppression energy E3 after the decrease from the valve opening energy E1. If the drive suppression energy E3 has been reached, the process proceeds to S205, and if it has not elapsed, the process proceeds to S203.

  In S203, it is determined whether or not the pressure P3 of the low pressure chamber Cl is equal to or higher than a predetermined lower limit pressure P3l. If it is equal to or higher than the pressure P31, the process proceeds to S204. If it is less than the pressure P31, the process returns to S202, and S202 and the subsequent processes are repeated.

  In S204, it is determined that a valve closing failure has occurred in the pressure adjusting unit 524.

  In S205, until the time t4 elapses, in other words, after the drive suppression energy E3 is supplied, the process waits until the drive energy reaches the pressure adjustment energy E2.

  In S206, it is determined whether or not the pressure P3 in the low pressure chamber Cl has risen beyond a predetermined range. This determination is based on, for example, determining whether or not the pressure P3 of the low pressure chamber Cl is equal to or higher than a predetermined lower limit pressure Pl3. If the pressure is equal to or higher than Pl3, the process proceeds to S207, and if the pressure is less than Pl3, the process proceeds to S208. The “predetermined range” referred to in the above determination is an index indicating that the increase in the pressure P3 of the low pressure chamber Cl is due to a slow leak through the pressure adjusting unit 525. Therefore, the above determination may be made by determining whether or not the increase amount ΔP3 of the pressure P3 relative to the supply of drive energy is larger than SLp indicating the increase due to the slow leak.

  In S207, it is determined that the valve body 52 is normal.

  In S208, it is determined whether or not there is a change in the pressure P3 of the low pressure chamber Cl. If there is no change and the pressure before the supply of drive energy is maintained, the process proceeds to S209, and if there is a change, the process proceeds to S210.

  In S209, it is determined that at least the blocking unit 524 of the blocking unit 524 and the pressure adjusting unit 525 has a valve opening failure.

  In S210, it is determined that a valve opening failure has occurred in the pressure adjusting unit 525.

  In the present embodiment, the “control device for the high-pressure fluid control valve” is realized by the control unit 101. The process of S101 shown in FIG. 9 and the process of S201 shown in FIG. 10 realize the function as the “control unit”, and the processes of S102 to 107 and S202 to 210 realize the function as the “abnormality diagnosis unit”.

(Explanation of effects)
The above is description regarding the integrated main stop valve 5 and its control apparatus, and the effect obtained by this embodiment is summarized below.

  According to the present embodiment, the opening / closing function and the pressure regulating function can be integrated into one control valve (integrated main stop valve 5), thereby improving the layout of piping and the like, as well as the number of parts and the manufacturing cost. Can be reduced.

  And according to this embodiment, it is possible to raise the utility of the integrated main stop valve 5 for the following reasons.

  First, since the presence or absence of abnormality in the integrated main stop valve 5 can be diagnosed, proper operation of the integrated main stop valve 5 can be achieved.

  Secondly, by making it possible to diagnose the occurrence of valve closing failure in at least the shut-off unit 524 among the shut-off unit 524 and the pressure regulating unit 525, the downstream component is excessively exceeded the allowable range due to a rapid pressure increase in the low-pressure chamber Cl. It is possible to prevent excessive pressure from being applied.

  Further, since it becomes possible to diagnose the occurrence of valve closing failure in both the shut-off unit 524 and the pressure adjusting unit 525 at an earlier time, the downstream components can be more reliably protected from application of excessive pressure.

  Thirdly, since the occurrence of valve closing failure in the pressure adjusting unit 525 can be diagnosed, it is possible to avoid shifting to pressure adjustment in a state where accurate control of the pressure P3 of the low pressure chamber Cl becomes difficult. .

  Fourth, by making it possible to diagnose the occurrence of valve opening failure in at least the shut-off unit 524 among the shut-off unit 524 and the pressure adjusting unit 525, the pressure on the downstream side suddenly decreases due to the sudden release of the fault of the shut-off unit 524. Can be prevented, and downstream components can be protected from sudden pressure increases.

  Fifth, by making it possible to diagnose the occurrence of valve opening failure in the pressure adjusting unit 525, it is possible to avoid difficulty in accurate pressure adjustment.

  In the above description, the case where the present invention is applied to a fuel cell vehicle has been described as an example. However, the present invention is not limited to this, and is applied to a natural gas vehicle as an integrated main stop valve having a pressure regulating valve function. It is also possible to do.

  Although the embodiments of the present invention have been described above, the present invention is not limited to these embodiments, and various changes and modifications can be made within the scope of the matters described in the claims. Not too long.

DESCRIPTION OF SYMBOLS 1 ... Fuel cell system 5 ... Integrated main stop valve (high pressure fluid control valve)
DESCRIPTION OF SYMBOLS 51 ... Housing 51a ... Valve body guide hole 511 ... Blocking sheet part 512 ... Pressure regulation sheet part Ch ... High pressure chamber Cm ... Intermediate | middle chamber Cl ... Low pressure chamber 52 ... Valve body 521 ... Main shaft part 524 ... Blocking part 525 ... Pressure regulation part 526 ... annular seal member 53 ... solenoid 531 ... electromagnetic coil 532 ... plunger 54 ... valve return mechanism p1 ... primary port p2 ... secondary port 12 ... cathode gas supply / discharge mechanism 121 ... cathode gas supply passage 122 ... cathode off-gas discharge passage 14 ... anode Gas supply / exhaust mechanism 141 ... High-pressure hydrogen tank (fuel tank)
142 ... Anode gas supply passage 143 ... Anode off gas circulation passage 101 ... Control unit

Claims (13)

The disc,
A housing for accommodating the valve body;
A solenoid for driving the valve body,
A high pressure chamber communicating with the primary port, a low pressure chamber communicating with the secondary port, and an intermediate chamber between the high pressure chamber and the low pressure chamber are formed in the housing, and when the valve body is fully closed As a sheet portion to contact, a blocking sheet portion between the high pressure chamber and the intermediate chamber, a pressure adjusting sheet portion having a smaller sheet diameter than the blocking sheet portion between the intermediate chamber and the low pressure chamber, Each provided,
A control device for a high-pressure fluid control valve configured to control a high-pressure fluid control valve configured so that the pressure-adjusting sheet portion is opened after the shut-off sheet portion at the time of valve opening operation from fully closed,
A pressure sensor for detecting the pressure of the low pressure chamber;
A control unit for supplying driving energy for driving the valve element to the solenoid;
An abnormality diagnosis unit for diagnosing the presence or absence of an abnormality in the high-pressure fluid control valve;
With
The control unit supplies, as the drive energy, the first drive energy for opening the blocking sheet portion during the opening operation from the fully closed high pressure fluid control valve, and then opens the pressure of the low pressure chamber. Switching to a second drive energy that is smaller than the first drive energy to be within a predetermined control range during pressure regulation after the valve;
When the detected pressure value of the pressure sensor reaches the predetermined control range before the driving energy reaches the second driving energy, the abnormality diagnosis unit causes an abnormality in the high-pressure fluid control valve. A control device for a high-pressure fluid control valve.   If the detected pressure value rises beyond a predetermined range before the drive energy reaches the first drive energy after the supply of the drive energy is started, the abnormality diagnosis unit 2. The control device for a high-pressure fluid control valve according to claim 1, which diagnoses that at least the shut-off portion of the pressure adjusting portion has a valve closing failure.   The abnormality diagnosis unit diagnoses that a valve closing failure has occurred in both the shut-off unit and the pressure regulating unit when the increase in the pressure detection value occurs immediately after the supply of the drive energy is started. Item 3. A control device for a high-pressure fluid control valve according to Item 2. The control unit transitions the drive energy to the second drive energy via a third drive energy smaller than the second drive energy after the decrease from the first drive energy,
The abnormality diagnosis unit supplies the first drive energy, and if the detected pressure value reaches the predetermined control range before the drive energy reaches the third drive energy, the abnormality diagnosis unit performs the adjustment. The control device for a high-pressure fluid control valve according to any one of claims 1 to 3, which diagnoses that a valve closing failure has occurred in the pressure section.   The abnormality diagnosis unit diagnoses that an abnormality has occurred in the high-pressure fluid control valve when the pressure detection value does not rise beyond a predetermined range even after the first drive energy is supplied. The control apparatus of the high pressure fluid control valve as described in any one of 1-4.   In the abnormality diagnosis unit, when the pressure detection value does not increase and the pressure detection value before supplying the first driving energy is maintained, at least the blocking unit among the blocking unit and the pressure adjusting unit The control device for a high-pressure fluid control valve according to claim 5, which diagnoses that a valve opening failure has occurred.   The abnormality diagnosis unit raises the pressure detection value after supplying the first drive energy, but if there is no increase exceeding the predetermined range, a valve opening failure has occurred in the pressure adjusting unit. The control device of the high-pressure fluid control valve according to claim 5 or 6, wherein The disc,
A housing for accommodating the valve body;
A solenoid for driving the valve body,
A high pressure chamber communicating with the primary port, a low pressure chamber communicating with the secondary port, and an intermediate chamber between the high pressure chamber and the low pressure chamber are formed in the housing, and when the valve body is fully closed As a sheet portion to contact, a blocking sheet portion between the high pressure chamber and the intermediate chamber, a pressure adjusting sheet portion having a smaller sheet diameter than the blocking sheet portion between the intermediate chamber and the low pressure chamber, Each provided,
A control device for a high-pressure fluid control valve configured to control a high-pressure fluid control valve configured so that the pressure-adjusting sheet portion is opened after the shut-off sheet portion at the time of valve opening operation from fully closed,
A pressure sensor for detecting the pressure of the low pressure chamber;
A control unit for supplying driving energy for driving the valve element to the solenoid;
An abnormality diagnosis unit for diagnosing the presence or absence of an abnormality in the high-pressure fluid control valve;
With
The control unit supplies, as the drive energy, the first drive energy for opening the blocking sheet portion during the opening operation from the fully closed high pressure fluid control valve, and then opens the pressure of the low pressure chamber. Switching to a second drive energy that is smaller than the first drive energy to be within a predetermined control range during pressure regulation after the valve;
The abnormality diagnosis unit diagnoses that an abnormality has occurred in the high-pressure fluid control valve if the pressure detection value of the pressure sensor does not rise beyond a predetermined range even after the first drive energy is supplied. , High pressure fluid control valve control device.   In the abnormality diagnosis unit, when the pressure detection value does not increase and the pressure detection value before supplying the first driving energy is maintained, at least the blocking unit among the blocking unit and the pressure adjusting unit The control device for a high-pressure fluid control valve according to claim 8, which diagnoses that a valve opening failure has occurred.   The abnormality diagnosis unit raises the pressure detection value after supplying the first drive energy, but if there is no increase exceeding the predetermined range, a valve opening failure has occurred in the pressure adjusting unit. The control device for a high-pressure fluid control valve according to claim 8 or 9, wherein A start switch for outputting a start command for the high-pressure fluid control valve;
The control unit supplies the first drive energy to the solenoid in response to a signal from the start switch,
The high-pressure fluid control valve according to any one of claims 1 to 10, wherein the abnormality diagnosis unit diagnoses the presence or absence of an abnormality in the high-pressure fluid control valve during a valve opening operation based on a signal from the start switch. Control device. The housing for accommodating the valve body includes a high pressure chamber communicating with the primary port, a low pressure chamber communicating with the secondary port, and an intermediate chamber between the high pressure chamber and the low pressure chamber, and the valve body As a seat portion that contacts when fully closed, a shut-off sheet portion between the high-pressure chamber and the intermediate chamber has a smaller sheet diameter than the shut-off sheet portion between the intermediate chamber and the low-pressure chamber Each of the seat portions is provided and diagnoses whether there is an abnormality in the high-pressure fluid control valve configured so that the pressure regulating seat portion is opened after the shut-off seat portion at the time of valve opening operation from the fully closed state, An abnormality diagnosis method for a high pressure fluid control valve,
As drive energy for driving the valve body, after supplying the first drive energy for opening the shut-off seat portion during the valve opening operation from the fully closed high pressure fluid control valve, the pressure of the low pressure chamber Is switched to a second drive energy that is smaller than the first drive energy to be within a predetermined control range during pressure regulation after valve opening,
High pressure fluid control for diagnosing an abnormality in the high pressure fluid control valve when the pressure in the low pressure chamber reaches the predetermined control range before the drive energy reaches the second drive energy Valve abnormality diagnosis method. The housing for accommodating the valve body includes a high pressure chamber communicating with the primary port, a low pressure chamber communicating with the secondary port, and an intermediate chamber between the high pressure chamber and the low pressure chamber, and the valve body As a seat portion that contacts when fully closed, a shut-off sheet portion between the high-pressure chamber and the intermediate chamber has a smaller sheet diameter than the shut-off sheet portion between the intermediate chamber and the low-pressure chamber Each of the seat portions is provided and diagnoses whether there is an abnormality in the high-pressure fluid control valve configured so that the pressure regulating seat portion is opened after the shut-off seat portion at the time of valve opening operation from the fully closed state, An abnormality diagnosis method for a high pressure fluid control valve,
As drive energy for driving the valve body, after supplying the first drive energy for opening the shut-off seat portion during the valve opening operation from the fully closed high pressure fluid control valve, the pressure of the low pressure chamber Is switched to a second drive energy that is smaller than the first drive energy to be within a predetermined control range during pressure regulation after valve opening,
If the pressure in the low-pressure chamber does not rise beyond a predetermined range even after the first drive energy is supplied, the abnormality diagnosis of the high-pressure fluid control valve is performed to diagnose that an abnormality has occurred in the high-pressure fluid control valve. Method.

Images