JP7269117B2 - fuel cell industrial vehicle - Google Patents

Description

The present invention relates to industrial vehicles, and more particularly to fuel cell industrial vehicles.

In recent years, attention has been paid to fuel cells that are clean and have high energy efficiency for use in vehicles such as industrial vehicles. 2. Description of the Related Art An industrial vehicle that operates using electric power generated by a fuel cell (hereinafter referred to as a "fuel cell industrial vehicle") is equipped with a filling plug for filling a fuel tank with hydrogen as a fuel gas. A fill plug is provided in a fuel cell unit that includes a fuel cell. Hydrogen is supplied to fuel cell industrial vehicles at hydrogen stations. The hydrogen station is equipped with a dispenser for supplying hydrogen. A hydrogen supply hose is connected to the dispenser. A fill socket is provided at the tip of the hose. When filling the fuel tank of the fuel cell industrial vehicle with hydrogen, the filling socket provided at the tip of the hose is inserted into the filling plug of the fuel cell unit for connection.

In addition, the fuel cell unit is provided with an openable and closable filling lid. A filling lid is provided on the side of the fuel cell unit to cover the filling plug. The filling plug is shielded from the outside when the filling lid is closed, and exposed to the outside when the filling lid is opened. Therefore, when filling the fuel tank of a fuel cell industrial vehicle with hydrogen, it is necessary to open the filling lid before connecting the filling socket to the filling plug. Patent Literature 1 describes a technique in which a limit switch is provided, the output signal of which is switched according to the opening/closing operation of the filling lid, and the open/closed state of the filling lid is detected by the limit switch.

JP 2013-237393 A

Generally, fuel cell industrial vehicles need to be stopped while fuel tanks are being filled with hydrogen. For this reason, for example, if the filling lid is opened by the operator and this is detected by the output signal of the limit switch, the fuel cell industrial vehicle can be controlled to remain stationary until the filling lid is closed. desirable.

On the other hand, some fuel cell industrial vehicles have a cover attached to the side surface of the vehicle body in order to improve the design. This cover is attached so as to cover the side surface of the fuel cell unit. However, since the above-described charging lid is provided on the side surface of the fuel cell unit, if the cover is attached to the side surface of the vehicle body, the charging lid will be hidden behind the cover. For this reason, it is necessary to provide the cover with an opening/closing door in accordance with the position of the filling lid.

However, when a cover with a door as described above is attached to the vehicle body, it becomes a so-called double door in which the filling lid exists on the back side of the door of the cover. Therefore, when filling the fuel tank with hydrogen, the cover door is first opened, and then the filling lid is opened. Therefore, the operator's filling operation becomes complicated. It is also conceivable to omit the filling lid in order to simplify the filling operation, and employ a configuration in which the output signal of the limit switch is switched by opening and closing the door of the cover. However, in that case, there is a risk of relative positional deviation between the cover attached to the vehicle body and the limit switch provided on the fuel cell unit. Therefore, it is necessary to finely adjust the position of the limit switch according to the position of the fuel cell unit and the door of the cover.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and its object is to provide a fuel cell unit which can be charged during fuel gas charging without providing a charging lid or using a cover door. To provide a fuel cell type industrial vehicle that can be controlled so that the industrial vehicle does not run.

A fuel cell industrial vehicle according to the present invention includes a fuel cell unit having a fuel cell, a fuel tank provided in the fuel cell unit for storing fuel gas supplied to the fuel cell, and the fuel cell unit. and a control means for controlling the operation of the vehicle body, wherein the fuel cell unit is a plug for filling the fuel tank with the fuel gas, and is a plug for supplying the fuel gas. A filling plug to which a socket can be connected, and a detection mechanism for detecting a connection state of the filling plug and the filling socket, wherein the detection mechanism outputs a signal according to a connection state of the filling socket to the filling plug. The control means has a variable sensor, and the control means controls to prohibit the operation of the vehicle main body when it is determined that the filling socket is connected to the filling plug based on the output signal of the sensor. , the filling plug is configured such that the filling socket can be inserted and removed, and the detection mechanism has a moving member that is pushed by the filling socket and moves in a predetermined direction when the filling socket is inserted into the filling plug. , the moving member is arranged to surround part of the outer peripheral surface of the filling plug, the sensor has a mover that is pushed in by movement of the moving member, and the filling socket contacts the moving member. , the output signal is changed by moving the moving member and pushing the mover .

A fuel cell industrial vehicle according to the present invention includes a fuel cell unit having a fuel cell, a fuel tank provided in the fuel cell unit for storing fuel gas supplied to the fuel cell, and the fuel cell unit. and a control means for controlling the operation of the vehicle body, wherein the fuel cell unit is a plug for filling the fuel tank with the fuel gas, and is a plug for supplying the fuel gas. A filling plug to which a socket can be connected, and a detection mechanism for detecting a connection state of the filling plug and the filling socket, wherein the detection mechanism outputs a signal according to a connection state of the filling socket to the filling plug. The control means has a variable sensor, and the control means controls to prohibit the operation of the vehicle main body when it is determined that the filling socket is connected to the filling plug based on the output signal of the sensor. , the filling plug is configured such that the filling socket can be inserted and removed, and the detection mechanism has a moving member that is pushed by the filling socket and moves in a predetermined direction when the filling socket is inserted into the filling plug. , the moving member is disposed so as to surround a part of the outer peripheral surface of the filling plug, the sensor has a mover that is released from a depressed state by the movement of the moving member, and the filling socket moves the moving member. The output signal changes by contacting a member, moving the moving member, and canceling the pushed state of the mover .

The fuel cell industrial vehicle according to the present invention may be configured to include a biasing member that biases the moving member in a direction opposite to the predetermined direction.

In the fuel cell industrial vehicle according to the present invention, the movable member may be provided with a tubular portion, and one end portion of the biasing member may be accommodated in the tubular portion.

A fuel cell powered industrial vehicle according to the present invention comprises a vehicle key switch that detects a key-on state, and the control means controls the vehicle key switch to detect the key-on state, and the control means to control the fuel cell based on the output signal of the sensor. The configuration may be such that when it is determined that the filling socket is connected to the plug, control is performed to prohibit the operation of the vehicle body.

According to the present invention, it is possible to control the industrial vehicle so that it does not run during fuel gas filling without providing a fuel cell unit with a filling lid or without using the door of the cover.

1 is a side view of a forklift as a fuel cell industrial vehicle according to Embodiment 1 of the present invention; FIG. FIG. 2 is a schematic perspective view showing the appearance of a fuel cell unit included in the forklift shown in FIG. 1; It is the figure which expanded the A section of FIG. It is the figure which looked at the detection mechanism from the direction orthogonal to the central axis direction of a filling plug. FIG. 10 is a front view showing the positional relationship between the filling socket and the pushing plate, assuming that the filling socket is connected to the filling plug. FIG. 2 is a schematic diagram for explaining the configuration and processing contents of the control system of the fuel cell industrial vehicle according to Embodiment 1; FIG. 7 is a view of a detection mechanism provided in a fuel cell industrial vehicle according to Embodiment 2 of the present invention, viewed from a direction perpendicular to the center axis direction of the filling plug; 8 is a diagram for explaining the operation of the detection mechanism shown in FIG. 7; FIG. It is the schematic explaining the 1st modification of a detection mechanism. It is the schematic explaining the 2nd modification of a detection mechanism. It is a schematic diagram explaining the 3rd modification of a detection mechanism.

Embodiment 1.
Embodiment 1 of the present invention will be described in detail below with reference to the drawings.
In addition, in this Embodiment 1, a fuel cell type forklift is mentioned as an example and demonstrated as a fuel cell type industrial vehicle. Further, in the first embodiment, the directions of "back and forth", "left and right" and "up and down" are defined based on a state in which the operator sits in the driver's seat of the forklift and faces the forward direction of the forklift.

(forklift)
FIG. 1 is a side view of a forklift as a fuel cell industrial vehicle according to Embodiment 1 of the present invention.
As shown in FIG. 1, the forklift 10 includes a vehicle body 11, driving wheels 12 provided at the front lower portion of the vehicle body portion 11, steering wheels 13 provided at the rear lower portion of the vehicle body portion 11, and the vehicle body portion 11. and a cargo handling device 14 provided in the front part of the. Among them, the vehicle body 11 and the cargo handling device 14 constitute the vehicle body of the forklift 10 . In the front-rear direction of the forklift 10, the driving wheels 12 correspond to the front wheels, and the steering wheels 13 correspond to the rear wheels.

The cargo handling device 14 includes a mast 15 , a lift cylinder 16 , a fork 17 , a lift bracket 18 and a pair of left and right tilt cylinders 19 . The mast 15 is provided on the front portion of the vehicle body portion 11 . The mast 15 has a pair of left and right outer masts 15a and a pair of left and right inner masts 15b. The lift cylinder 16 is provided at the rear portion of the pair of outer masts 15a. The lift bracket 18 is provided on the front part of the mast 15 so that it can be raised and lowered. The fork 17 is attached to the lift bracket 18 and moves up and down together with the lift bracket 18 .

The pair of left and right tilt cylinders 19 tilts the mast 15 in the front-rear direction, and is provided corresponding to the pair of left and right outer masts 15a. A base end portion of the tilt cylinder 19 is rotatably connected to the vehicle body portion 11 . The tip of the tilt cylinder 19 is rotatably connected to the side surface of the outer mast 15a. The mast 15 tilts in the front-rear direction by driving the tilt cylinder 19 to extend and retract.

Further, the forklift 10 is provided with a cab 20 . A driver's seat 21 is provided in the driver's cab 20 . A steering wheel 22 , a lift lever 23 and a tilt lever 24 are provided on the front side of the driver's seat 21 . The steering wheel 22 is a steering wheel for changing the direction of the steered wheels 13 . The lift lever 23 is a lever for raising and lowering the fork 17 . The tilt lever 24 is a lever for tilting the mast 15 in the front-rear direction. An accelerator pedal 25 is provided on the floor of the cab 20 . The accelerator pedal 25 is a pedal for adjusting the rotation speed of the drive wheels 12 , that is, the travel speed of the forklift 10 . The travel speed of the forklift 10 is adjusted according to the amount of depression of the accelerator pedal 25 .

A fuel cell unit 26 , a traveling motor 27 , and a cargo handling motor 28 are mounted on the vehicle body portion 11 . The fuel cell unit 26 includes a fuel cell (not shown). A fuel cell is connected to the fuel tank 31 . A fuel tank 31 is provided in the fuel cell unit 26 . The fuel tank 31 stores fuel gas necessary for the fuel cell to generate electric power.

The fuel cell unit 26 is covered with a cover 29 . The cover 29 is attached to the side portion of the vehicle body portion 11 in order to enhance the design of the forklift 10 . The cover 29 is painted in the same color as the body part 11. - 特許庁The cover 29 is provided with a door 30 that can be opened and closed.

The travel motor 27 serves as a drive source for rotating the drive wheels 12 . The output shaft of the running motor 27 is connected to the rotating shaft of the drive wheel 12 via a speed reducer (not shown). The cargo handling motor 28 serves as a drive source for raising and lowering the fork 17 and for tilting the fork 17 . The cargo handling motor 28 drives a hydraulic pump (not shown) to extend and retract the lift cylinder 16 and the tilt cylinder 19 .

(fuel cell unit)
2 is a schematic perspective view showing the appearance of a fuel cell unit provided in the forklift shown in FIG. 1. FIG. Moreover, FIG. 3 is the figure which expanded the A section of FIG. In FIG. 3, the casing of the fuel cell unit is indicated by a chain double-dashed line, and the inside of the casing is shown in a partially transparent state.

As shown in FIG. 2 , the fuel cell unit 26 has a housing 32 . The housing 32 is formed as a rectangular parallelepiped as a whole. The fuel cell is provided inside the housing 32 . One side of housing 32 is covered with plate 33 . When the fuel cell unit 26 is mounted on the forklift 10 , the plate 33 is arranged so as to face the side surface of the vehicle body portion 11 . The plate 33 is formed in a substantially rectangular shape. A window 34 for fuel gas filling is formed in one corner of the plate 33 . The window portion 34 is formed by cutting out a portion of the plate 33 .

The deep side of the window portion 34 forms a space 35 recessed from the plate 33 as shown in FIG. In Embodiment 1, the fuel cell unit 26 is not provided with a charging lid. Therefore, even if the cover 29 (see FIG. 1) is attached to the vehicle body portion 11 as described above, the double door is not formed. A filling plug 36 is arranged in the space 35 . The filling plug 36 is a plug for filling the fuel tank 31 of the forklift 10 with hydrogen. The door 30 of the cover 29 shown in FIG. 1 is provided in alignment with the position of the filling plug 36 of the fuel cell unit 26 . Therefore, when the door 30 is opened, the filling plug 36 of the fuel cell unit 26 is exposed to the outside. The filling plug 36 is connected to the fuel tank 31 via a fuel gas supply passage (not shown). The filling plug 36 is cylindrically formed. A cap (not shown) is attached to the fill plug 36 . This cap is attached to the distal end of the filling plug 36 so as to block the receptacle 38 of the filling plug 36 except when filling.

On the other hand, the filling socket 41 is a socket for fuel gas supply. The filling plug 36 described above is configured to be connectable to this filling socket 41 . Further, in Embodiment 1, the filling plug 36 is configured so that the filling socket 41 can be inserted/extracted. The filling socket 41 is cylindrically shaped. The outer diameter dimension of the filling socket 41 is set larger than the outer diameter dimension of the filling plug 36 . A filling socket 41 is provided at the tip of a hose 42 for supplying hydrogen. The hose 42 is connected to a dispenser of a hydrogen station (not shown), and hydrogen is sent from this dispenser through the hose 42 to the filling socket 41 .

When connecting the filling socket 41 to the filling plug 36 , the cap is removed from the filling plug 36 to expose the receptacle 38 , and the tip of the filling socket 41 is inserted into the receptacle 38 . When the filling socket 41 is inserted into the filling plug 36, the connection state between the two is locked by a locking mechanism (not shown), and the fuel tank 31 is filled with hydrogen in this state. On the other hand, when removing the filling socket 41 from the filling plug 36 , the locking mechanism is unlocked and the filling socket 41 is pulled out from the filling plug 36 .

(detection mechanism)
3 and 4, the fuel cell unit 26 also has a detection mechanism 45 that detects the connection state between the filling plug 36 and the filling socket 41. As shown in FIGS. There are two states of connection between the fill plug 36 and the fill socket 41 . One is the state in which the filling socket 41 is connected to the filling plug 36 and the other is the state in which the filling socket 41 is not connected to the filling plug 36 . That is, the detection mechanism 45 is a mechanism for detecting whether or not the filling socket 41 is connected to the filling plug 36 .

The detection mechanism 45 includes a push plate 51 arranged near the filling plug 36, a hinge 52 that movably supports the push plate 51, and a limit switch whose output signal changes when pushed by the push plate 51. 53 , a spring member 54 for pushing back the pushing plate 51 , and a limiting plate 55 for limiting the movable range of the pushing plate 51 .

(push plate)
The pushing plate 51 corresponds to a moving member that is pushed by the filling socket 41 and moves in a predetermined direction when the filling socket 41 is inserted into the filling plug 36 .
FIG. 5 is a front view showing the positional relationship between the filling socket and the pushing plate when the filling socket is connected to the filling plug. In FIG. 5, the outer peripheral shape of the tip portion of the filling socket when viewed from the central axis direction of the filling plug is indicated by a chain double-dashed line.
The position of the pressing plate 51 in the direction of the central axis of the filling plug 36 is such that when the filling socket 41 is inserted into the filling plug 36 for connection, the tip of the filling socket 41 pushes the pressing plate 51 inward. It is set on the far side from the socket 38 by a predetermined dimension.

A semicircular relief portion 61 is formed in the pressing plate 51 . The relief portion 61 is curved in a semicircular shape along the outer peripheral shape of the filling plug 36 . Further, the relief portion 61 is arranged so as to surround the upper outer peripheral surface of the filling plug 36 .

On the other hand, the distal end portion of the filling socket 41 connected to the filling plug 36 protrudes radially outward of the filling plug 36 from the escape portion 61 of the push plate 51 when viewed from the central axis direction of the filling plug 36 . are placed. For this reason, the filling socket 41 and the pushing plate 51 are arranged so as to overlap each other outside the relief portion 61 . Therefore, when the filling socket 41 is inserted into the filling plug 36, the tip of the filling socket 41 comes into contact with the pushing plate 51 during the insertion, thereby pushing the pushing plate 51 inward.

(hinge)
The hinge 52 has a shaft portion 62 and a pair of wings 63 and 64 rotatable about the shaft portion 62, as shown in FIG. A push plate 51 is attached to the wing portion 63 by, for example, welding. The pressing plate 51 is supported so as to be rotatable about the shaft portion 62 of the hinge 52 . Also, the push plate 51 hangs down from the hinge 52 by its own weight. Wing 64 is attached to bracket 65 by welding, for example. The bracket 65 is composed of an L-shaped plate. Bracket 65 is fixed to plug mounting plate 68 with bolts 67 . The plug mounting plate 68 is fixed to the housing 32 of the fuel cell unit 26 .

(Limit switch)
The limit switch 53 corresponds to a sensor whose output signal changes according to the state of connection of the filling socket 41 to the filling plug 36 . The output signal of the limit switch 53 turns on when the filling socket 41 is inserted into the filling plug 36 and turns off when the filling socket 41 is pulled out from the filling plug 36 . Therefore, when the filling socket 41 is connected to the filling plug 36, the output signal of the limit switch 53 is turned on, and when the filling socket 41 is not connected to the filling plug 36, the output signal of the limit switch 53 is turned on. It is turned off.

The limit switch 53 is attached to the plug attachment plate 68 using a pair of nuts 70, as shown in FIG. A pair of nuts 70 are engaged with male threads (not shown) formed on the body of the limit switch 53 . The pair of nuts 70 fix the limit switch 53 to the plug mounting plate 68 by sandwiching the plug mounting plate 68 from both sides in the plate thickness direction. Fill plug 36 is attached to plug mounting plate 68 using a pair of nuts 75 . The mounting position of the limit switch 53 in the central axis direction of the filling plug 36 can be adjusted by appropriately loosening and then tightening the pair of nuts 70 . The limit switch 53 is arranged above the filling plug 36 . Also, the limit switch 53 has a mover 71 . The mover 71 is movable in a direction parallel to the thickness direction of the plug mounting plate 68 (horizontal direction in FIG. 4). Further, the mover 71 is urged in one direction (leftward in FIG. 4) by a return spring incorporated in the limit switch 53 .

Here, of the two main surfaces 51a and 51b of the push plate 51, the surface facing the outside of the housing 32 is defined as the surface 51a, and the surface facing the inside of the housing 32 is defined as the back surface 51b. It is arranged to face the rear surface 51 b of the moving plate 51 . Further, when the push plate 51 is arranged at the initial position (details will be described later), the mover 71 of the limit switch 53 is arranged close to the rear surface 51 b of the push plate 51 . When the push plate 51 moves counterclockwise in FIG. 4 around the shaft portion 62 of the hinge 52, the mover 71 is pushed by the push plate 51, thereby turning off the output signal of the limit switch 53. to ON state.

(spring member)
The spring member 54 corresponds to an urging member that urges the pressing plate 51 clockwise in FIG. The spring member 54 is arranged between the pressing plate 51 and the plug mounting plate 68 in the central axis direction of the filling plug 36 . The spring member 54 is composed of a compression coil spring. The spring member 54 is compressed and deformed when the pushing plate 51 is pushed backward by the tip of the filling socket 41 , thereby generating a spring force that pushes the pushing plate 51 back forward. In addition, the spring member 54 generates a spring force that holds the pushing plate 51 at an initial position (details will be described later) when the filling socket 41 is not connected to the filling plug 36 .

The spring member 54 is supported by support pins 72 . The support pin 72 is fixed to the plug mounting plate 68 . The support pin 72 protrudes in the plate thickness direction of the plug mounting plate 68, and the spring member 54 is attached to this protruding portion. A cylindrical portion 73 is provided on the rear surface 51b of the pressing plate 51. As shown in FIG. The cylindrical portion 73 may be formed integrally with the pressing plate 51, or may be fixed to the pressing plate 51 by adhesion, screwing, or the like. One end of the spring member 54 is accommodated in the cylindrical portion 73 . The cylindrical portion 73 suppresses positional deviation of the spring member 54 with respect to the pressing plate 51 .

(restriction plate)
The limiting plate 55 is attached to the plug mounting plate 68 . The limiting plate 55 may be formed integrally with the bracket 65 or may be attached to the plug mounting plate 68 as a separate member from the bracket 65 . The restriction plate 55 integrally has an abutting portion 74 . The abutting portion 74 is arranged on the surface 51 a side of the pressing plate 51 . In addition, the abutting portion 74 protrudes downward. The movable range of the pressing plate 51 is limited when the surface 51 a of the pressing plate 51 contacts the abutting portion 74 of the limiting plate 55 . The initial position of the pressing plate 51 is uniquely determined when the surface 51a of the pressing plate 51 abuts against the abutment portion 74 of the limit plate 55. As shown in FIG. At this time, the pressing plate 51 is held in a state of being abutted against the abutting portion 74 by the biasing force of the spring member 54 . The initial position of the pushing plate 51 means the position of the pushing plate 51 when the filling socket 41 is not connected to the filling plug 36 . It refers to the position of the pushing plate 51 when it is in contact with the abutting portion 74 due to the biasing force.

(Operation of detection mechanism)
Next, operation of the detection mechanism 45 will be described.
First, when the filling socket 41 is not connected to the filling plug 36, the pressing plate 51 is pushed against the abutment portion 74 of the restriction plate 55 by the biasing force of the spring member 54, thereby is held at its initial position. When the push plate 51 is in the initial position, the mover 71 of the limit switch 53 is kept in a state of protruding by a predetermined amount due to the biasing force of the return spring. Therefore, the output signal of the limit switch 53 is turned off.

On the other hand, when the filling socket 41 is inserted into the filling plug 36, the tip of the filling socket 41 comes into contact with the surface 51a of the pushing plate 51 during the insertion. When the filling socket 41 is further inserted, the pressing plate 51 is pushed by the filling socket 41 and moves counterclockwise around the shaft portion 62 in FIG. At this time, the spring member 54 is pushed by the pushing plate 51 and is compressed and deformed. Further, when the push plate 51 moves as described above, the back surface 51b of the push plate 51 contacts the mover 71 of the limit switch 53, and the mover 71 is pushed by the push plate 51 in this state. Therefore, the output signal of the limit switch 53 changes from the off state to the on state.

When the filling socket 41 is pulled out from the filling plug 36, the pressing plate 51 moves clockwise around the shaft portion 62 in FIG. At this time, the pushing plate 51 is moved by the biasing force of the spring member 54 until it hits the abutting portion 74 of the limiting plate 55 . Therefore, the spring member 54 functions to return the pressing plate 51 to the initial position. On the other hand, the mover 71 of the limit switch 53 moves leftward in FIG. 4 as the push plate 51 moves. Therefore, the output signal of the limit switch 53 changes from the ON state to the OFF state.

Thus, in the detection mechanism 45, when the filling socket 41 is inserted into the filling plug 36, the output signal of the limit switch 53 is turned on, and when the filling plug 36 is pulled out from the filling socket 41, the output signal of the limit switch 53 is turned on. The signal is turned off. Therefore, by monitoring the output signal of the limit switch 53, it is possible to detect whether or not the filling socket 41 is connected to the filling plug 36.

FIG. 6 is a schematic diagram for explaining the configuration and processing contents of the control system of the fuel cell industrial vehicle according to the first embodiment.
First, a forklift 10 as a fuel cell industrial vehicle according to Embodiment 1 includes an FC controller 81 and a vehicle controller 82 . The FC controller 81 controls the operation of the fuel cell unit 26 and is provided inside the fuel cell unit. The vehicle controller 82 controls the operation of the vehicle body of the forklift 10 and is provided on the vehicle body. The FC controller 81 and the vehicle controller 82 constitute control means for controlling the operation of the vehicle body based on the detection result of the detection mechanism 45 .

A limit switch 53 and a vehicle key switch 83 are electrically connected to the FC controller 81 . The output signal of the limit switch 53 and the output signal of the vehicle key switch 83 are individually input to the FC controller 81 . The vehicle key switch 83 is a switch that detects a key-on state. The key-on state means that the output signal of the vehicle key switch 83 is in the ON state. The output signal of the vehicle key switch 83 is switched according to the key operation of the vehicle key by the operator. To give a specific example, the output signal of the vehicle key switch 83 is generated when the operator inserts the vehicle key into a key cylinder (not shown) provided around the steering wheel 22 of the driver's cab 20 from the stop position to the key-on position. Turning it turns it on, and returning it to the stop position turns it off. Therefore, when the vehicle key switch 83 detects the key-on state, the output signal of the vehicle key switch 83 is turned on.

The FC controller 81 performs CAN (Controller Area Network) communication 85 with the vehicle controller 82 and outputs a power supply line 86 and a permission line 87 to the vehicle controller 82 . The CAN communication 85 is a communication network for exchanging various information necessary for controlling the forklift 10 between the FC controller 81 and the vehicle controller 82 . A power line 86 and a permission line 87 are lines that connect the FC controller 81 and the vehicle controller 82, respectively. Also, the power supply line 86 is a line for supplying electric power generated by the fuel cell of the fuel cell unit 26 to the vehicle side of the forklift 10 . The permission line 87 is a line for permitting the operation of the vehicle body of the forklift 10 . The operation of the vehicle body of the forklift 10 includes traveling operation by the vehicle body portion 11 and cargo handling operation by the cargo handling device 14 . The travel operation is an operation performed by rotating the drive wheels 12 , and the cargo handling operation is an operation performed by driving the lift cylinder 16 or the tilt cylinder 19 .

In the above control configuration, when the operator inserts the vehicle key into the key cylinder and turns it from the stop position to the key-on position, the output signal of the vehicle key switch 83 switches from the OFF state to the ON state. As a result, the vehicle key switch 83 detects the key-on state. In this situation, an ON signal is output from the vehicle key switch 83 to the FC controller 81 . Then, the FC controller 81 that has received the ON signal from the vehicle key switch 83 determines whether or not the filling socket 41 is connected to the filling plug 36 based on the output signal of the limit switch 53 . At this time, if the output signal of the limit switch 53 is off, the FC controller 81 determines that the filling socket 41 is not connected to the filling plug 36, and if the output signal of the limit switch 53 is on, It is determined that the fill socket 41 is connected to the fill plug 36 . When determining that the filling socket 41 is connected to the filling plug 36 , the FC controller 81 cuts off the permission line 87 . When the FC controller 81 determines that the filling socket 41 is connected to the filling plug 36 under the condition that the vehicle key switch 83 detects the key-on state, the output signal of the vehicle key switch 83 and the limit This means that the output signals of the switch 53 are both turned on, that is, the AND condition shown in FIG. 6 is satisfied.

When the permission line 87 is cut off by the FC controller 81 as described above, the vehicle controller 82 prohibits the operation of the vehicle body of the forklift 10 . As a result, the forklift 10 cannot perform the traveling operation and the cargo handling operation. When the operation of the vehicle body of the forklift 10 is prohibited by the vehicle controller 82 in this manner, even if the operator depresses the accelerator pedal 25, the drive wheels 12 will remain stationary and will not rotate. Even if the lever 24 is operated, the lift cylinder 16 and the tilt cylinder 19 remain stopped and are not driven.

<Effect of Embodiment 1>
In Embodiment 1, a configuration is adopted in which the output signal of the limit switch 53, which is one component of the detection mechanism 45, changes according to the insertion/extraction of the filling socket 41 from the filling plug 36. FIG. Also, when the output signal of the limit switch 53 is turned on, the FC controller 81 determines that the filling socket 41 is connected to the filling plug 36, and controls the operation of the vehicle body of the forklift 10 to be prohibited. As a result, even if the fuel cell unit 26 is not provided with a filling lid, and even if the door 30 of the cover 29 is not used to switch the output signal of the limit switch, the forklift 10 can travel during fuel gas filling. can be controlled not to Further, in Embodiment 1, since the fuel cell unit 26 is not provided with a charging lid, even if the cover 29 is attached to the vehicle body portion 11, a double door is not formed. Therefore, it is possible to avoid complicating the filling operation due to the double door. Further, since the output signal of the limit switch 53 is switched regardless of the opening/closing operation of the door 30 of the cover 29, it is not necessary to finely adjust the position of the limit switch 53 according to the position of the door 30 of the cover 29.

Further, in the first embodiment, the detection mechanism 45 is provided with a push plate 51 that is pushed by the filling socket 41 to move when the filling socket 41 is inserted into the filling plug 36 , and the movement of the push plate 51 limits A configuration is adopted in which the output signal of the switch 53 changes. Thereby, the degree of freedom of the position where the limit switch 53 is attached can be increased.

Further, in the first embodiment, when the pressing plate 51 is pushed by the filling socket 41 inserted into the filling plug 36 and moved, the pressing plate 51 is pushed back by the biasing force of the spring member 54. ing. Thereby, when the filling socket 41 is pulled out from the filling plug 36 , the biasing force of the spring member 54 can be used to push back the pushing plate 51 . Therefore, it is possible to reliably change the output signal of the limit switch 53 according to the insertion/extraction of the filling socket 41 with respect to the filling plug 36 . It is also possible to push back the pushing plate 51 only by the urging force of the return spring incorporated in the limit switch 53 without providing the spring member 54 in the detection mechanism 45. In that case, the load applied to the return spring increases, the life of the limit switch 53 may be shortened. On the other hand, when the spring member 54 is provided, the load applied to the return spring is greatly reduced, so the life of the limit switch 53 can be extended.

Further, in Embodiment 1, a configuration is adopted in which the pushing plate 51 is provided with the cylindrical portion 73 and one end portion of the spring member 54 is accommodated in the cylindrical portion 73 . As a result, when the pressing plate 51 moves counterclockwise or clockwise around the shaft portion 62 in response to insertion or removal of the filling socket 41 from the filling plug 36 , the spring member 54 does not move against the pressing plate 51 . Positional deviation can be suppressed, and the biasing force of the spring member 54 can be reliably transmitted to the pressing plate 51 .

Embodiment 2
Next, Embodiment 2 of the present invention will be described.
A fuel cell industrial vehicle according to Embodiment 2 of the present invention differs from Embodiment 1 described above in the configuration of a detection mechanism that detects the connection state between filling plug 36 and filling socket 41 .

FIG. 7 is a diagram of a detection mechanism included in a fuel cell industrial vehicle according to Embodiment 2 of the present invention, viewed from a direction perpendicular to the center axis direction of the filling plug.
As shown in FIG. 7, the detection mechanism 100 includes a pushing plate 101 arranged near the filling plug 36, a hinge 102 movably supporting the pushing plate 101, and an output signal by the movement of the pushing plate 101. , a spring member 104 for pushing back the push plate 101, and a limit plate 105 for limiting the movable range of the push plate 101.

(push plate)
The pushing plate 101 corresponds to a moving member that is pushed by the filling socket 41 and moves in a predetermined direction when the filling socket 41 is inserted into the filling plug 36 . FIG. 7 shows the filling socket 41 before it is inserted into the filling plug 36, so the filling socket 41 is not shown. Pressing plate 101 is formed with a semi-circular relief portion (not shown) in the same manner as pressing plate 51 described in the first embodiment. Also, the upper portion 109 of the push plate 101 extends above the position of the hinge 102 . A contactor 110 is attached to the upper portion 109 of the push plate 101 . The contactor 110 has a bolt 110a and a nut 110b that fixes the bolt 110a to the upper portion 109 of the push plate 101. As shown in FIG. A threaded portion 110c of the bolt 110a penetrates the pressing plate 101 and projects to the opposite side of the bolt 110a.

(hinge)
The hinge 102 has a shaft portion 112 and a pair of wings 113 and 114 rotatable about the shaft portion 112 . The push plate 101 is attached to the wing portion 113 by welding or the like. The pressing plate 101 is supported so as to be rotatable around the shaft portion 112 of the hinge 102 . The wings 114 are attached to the bracket 115 by welding or the like. Bracket 115 is composed of an L-shaped plate. Bracket 115 is fixed to plug mounting plate 118 by bolts 117 . The plug mounting plate 118 is fixed to the housing 32 of the fuel cell unit 26 .

(Limit switch)
The limit switch 103 corresponds to a sensor whose output signal changes according to the state of connection of the filling socket 41 to the filling plug 36 . The output signal of the limit switch 103 is turned off when the filling socket 41 is inserted into the filling plug 36 and turned on when the filling socket 41 is pulled out from the filling plug 36 . Therefore, when the filling socket 41 is connected to the filling plug 36, the output signal of the limit switch 53 is turned off, and when the filling socket 41 is not connected to the filling plug 36, the output signal of the limit switch 53 is turned off. It turns on.

Limit switch 103 is attached to plug mounting plate 118 using a pair of nuts 120 . A pair of nuts 120 are engaged with male threads (not shown) formed on the body of the limit switch 103 . The pair of nuts 120 fix the limit switch 103 to the plug mounting plate 118 by sandwiching the plug mounting plate 118 from both sides in the plate thickness direction. Fill plug 36 is attached to plug mounting plate 118 using a pair of nuts 75 . Limit switch 103 is arranged above hinge 102 so as to face contactor 110 . Also, the limit switch 103 has a mover 121 . The mover 121 is movable in a direction parallel to the thickness direction of the plug mounting plate 118 (horizontal direction in FIG. 7). Further, the mover 121 is urged in one direction (to the left in FIG. 7) by a return spring incorporated in the limit switch 103 . A contact 110 is in contact with the mover 121 . The position adjustment between the mover 121 of the limit switch 103 and the push plate 101 is performed by the bolt 110a and nut 110b of the contactor 110. As shown in FIG. Specifically, a desired state in which the mover 121 of the limit switch 103 is pushed in by a predetermined amount while the surface 101a of the push plate 101 is in contact with the abutment portion 124 of the limit plate 105 (details will be described later). The positions of the mover 121 and the push plate 101 are finely adjusted by tightening the bolt 110a so that the bolt 110a is fixed to the push plate 101 by tightening the nut 110b. This facilitates adjustment of the positions of the limit switch 103 and the push plate 101 .

FIG. 7 shows a state in which the pressing plate 101 is arranged at the initial position. In the arrangement shown in FIG. 7, the threaded portion 110c of the bolt 110a, which is one of the components of the mover 121, contacts the mover 121, thereby pushing the mover 121 into the main body of the limit switch 103 by a predetermined amount. is The predetermined amount described here is the amount required to switch the output signal of the limit switch 103 from the OFF state to the ON state when the mover 121 is pushed against the biasing force of the return spring built into the limit switch 103. Say the amount you need. Therefore, in the arrangement state shown in FIG. 7, the output signal of the limit switch 103 is on. On the other hand, when the pressing plate 101 moves counterclockwise in FIG. It is displaced away from 103 . At this time, the mover 121 of the limit switch 103 protrudes leftward in FIG. 8 following the displacement of the contactor 110 due to the biasing force of the return spring (not shown). As a result, the output signal of the limit switch 103 changes from the ON state to the OFF state.

(spring member)
The spring member 104 corresponds to an urging member that urges the pressing plate 101 clockwise in FIG. The spring member 104 is arranged between the pressing plate 101 and the plug mounting plate 118 in the central axis direction of the filling plug 36 . The spring member 104 is composed of a compression coil spring. The spring member 104 is compressed and deformed when the push plate 101 is pushed backward by the tip of the filling socket 41, thereby generating a spring force that pushes the push plate 101 back forward. In addition, the spring member 104 generates a spring force that holds the pushing plate 101 in the initial position when the filling socket 41 is not connected to the filling plug 36 .

The spring member 104 is supported by support pins 122 . Support pin 122 is fixed to plug mounting plate 118 . The support pin 122 protrudes in the plate thickness direction of the plug mounting plate 118, and the spring member 104 is attached to this protruding portion. Of the two main surfaces 101a and 101b of the pressing plate 101, the surface facing the outside of the housing 32 (see FIG. 2) is defined as the surface 101a, and the surface facing the inside of the housing 32 is defined as the back surface 101b. A cylindrical portion 123 is provided on the back surface 101b. The cylindrical portion 123 may be formed integrally with the pressing plate 101, or may be fixed to the pressing plate 101 by adhesion, screwing, or the like. One end of the spring member 104 is accommodated in the tubular portion 123 . The cylindrical portion 123 suppresses displacement of the spring member 104 with respect to the pressing plate 101 .

(restriction plate)
The restricting plate 105 is attached to the plug mounting plate 118 . Limiting plate 105 may be formed integrally with bracket 115 or may be attached to plug mounting plate 118 as a member separate from bracket 115 . The restriction plate 105 integrally has an abutting portion 124 . 124 is arranged on the surface 101a side of the pressing plate 101 . Also, the abutting portion 124 protrudes downward. The movable range of the pressing plate 101 is limited when the surface 101a of the pressing plate 101 contacts the abutting portion 124 of the limiting plate 105 . Further, the initial position of the pressing plate 101 is uniquely determined when the surface 101a of the pressing plate 101 abuts against the abutment portion 124 of the limit plate 105 . At this time, the pressing plate 101 is held in a state of being abutted against the abutting portion 124 by the biasing force of the spring member 104 . The initial position of the pressing plate 101 refers to the position of the pressing plate 101 when the filling socket 41 is not connected to the filling plug 36 . It refers to the position of the pushing plate 101 when it abuts against the abutting portion 124 due to the biasing force.

(Operation of detection mechanism)
Next, operation of the detection mechanism 100 according to Embodiment 2 of the present invention will be described.
First, as shown in FIG. 7, when the filling socket 41 is not connected to the filling plug 36, the pressing plate 101 receives the urging force of the spring member 104 and abuts against the abutment portion 124 of the restriction plate 105. As a result, the pressing plate 101 is held at the initial position. When the push plate 101 is in the initial position, the contactor 110 pushes the mover 121 of the limit switch 103 by a predetermined amount against the urging force of a return spring (not shown) incorporated in the limit switch 103. state. Therefore, the output signal of the limit switch 103 is turned on. The pushing force of the contactor 110 is obtained by the biasing force of the spring member 104 arranged on the side opposite to the contactor 110 with the shaft portion 112 of the hinge 102 interposed therebetween.

On the other hand, when the filling socket 41 is inserted into the filling plug 36, the tip of the filling socket 41 comes into contact with the surface 101a of the pushing plate 101 during the insertion. When the filling socket 41 is further inserted, the pressing plate 101 is pushed by the filling socket 41 and moves counterclockwise around the shaft portion 112 in FIG. At this time, the spring member 104 is pushed by the pushing plate 101 and is compressed and deformed. Further, when the pressing plate 101 moves as described above, the contactor 110 is displaced away from the limit switch 103 according to the inclination of the pressing plate 101 . At this time, the mover 121 of the limit switch 103 protrudes leftward in FIG. 8 following the displacement of the contactor 110 due to the biasing force of the return spring (not shown). As a result, the output signal of the limit switch 103 changes from the ON state to the OFF state.

When the filling socket 41 is pulled out from the filling plug 36, the pressing plate 101 moves clockwise about the shaft portion 112 in FIG. At this time, the pressing plate 101 is moved by the biasing force of the spring member 104 until it hits the abutting portion 124 of the limiting plate 105 . Therefore, the spring member 104 functions to return the pressing plate 101 to the initial position. On the other hand, the upper portion 109 of the push plate 101 and the contactor 110 attached thereto are displaced in the direction toward the limit switch 103 as the push plate 101 moves. Therefore, the movable element 121 of the limit switch 103 is pushed by a predetermined amount by the contactor 110, thereby changing the output signal of the limit switch 103 from the off state to the on state.

As described above, in the detection mechanism 100 according to the second embodiment, when the filling socket 41 is inserted into the filling plug 36, the output signal of the limit switch 103 is turned off, and the filling socket 41 is pulled out from the filling plug 36. Then, the output signal of the limit switch 103 is turned on. Therefore, by monitoring the output signal of the limit switch 103, it is possible to detect whether or not the filling socket 41 is connected to the filling plug 36. FIG. In the control system of the fuel cell industrial vehicle according to the second embodiment, the FC controller 81 determines that the filling socket 41 is not connected to the filling plug 36 if the output signal of the limit switch 103 is in the ON state. If the output signal of the limit switch 103 is in the off state, it is determined that the filling socket 41 is connected to the filling plug 36 . Then, when the FC controller 81 determines that the filling socket 41 is connected to the filling plug 36, it cuts off the permission line 87 to prohibit the operation of the vehicle body of the forklift 10 (running operation and cargo handling operation). By adopting such a configuration, for example, when a problem such as the limit switch 103 falling off occurs, the output signal of the limit switch 103 is kept in the same state as when the filling socket 41 is connected, that is, in the OFF state. Therefore, it is possible to avoid the occurrence of an error in which the operation of the vehicle body is erroneously permitted while the fuel gas is being charged. Therefore, it is possible to provide a fuel cell industrial vehicle having a more robust configuration for controlling the industrial vehicle so that it does not run while the fuel gas is being charged.

<Modifications, etc.>
The technical scope of the present invention is not limited to the above-described embodiments, and includes various modifications and improvements within the range where specific effects obtained by the constituent elements of the invention and their combinations can be derived.

For example, in Embodiments 1 and 2 described above, the detection mechanisms 45 and 100 are configured so that the push plates 51 and 101 are used as moving members. Although the configuration in which the output signal of is changed is adopted, the present invention is not limited to this. For example, as shown in FIG. 9, a lever 90 is rotatably supported by a hinge 91, and pushed by a filling socket 41 inserted into a filling plug 36 to move the lever 90 in the counterclockwise direction of the drawing. A configuration in which the mover 93 of the limit switch 92 is pushed may be adopted. Also, although not shown, a cam mechanism or a link mechanism may be used to push the mover of the limit switch, or the filling socket 41 inserted into the filling plug 36 directly pushes the mover of the limit switch. configuration may be employed.
In Embodiments 1 and 2 above, the pair of nuts 70 and 120 that support the limit switches 53 and 103 are connected to the plug mounting plates 68 and 118 so that the limit switches 53 , 103 or directly welding the limit switches 53, 103 to the plug mounting plates 68, 118 without using nuts.

Further, the sensor provided in the detection mechanism 45 or the detection mechanism 100 is not limited to a contact sensor such as a limit switch, and may be a non-contact sensor. As a non-contact sensor, for example, a distance sensor 94 shown in FIG. 10 or an optical sensor 95 shown in FIG. 11 can be used.

In FIG. 10, a distance sensor 94 is provided near the filling plug 36 . The distance sensor 94 has a light emitting portion 94a and a light receiving portion 94b. The distance sensor 94 outputs a sensor signal corresponding to the time difference from when light is emitted from the light emitting portion 94a toward the object to be measured until the light reflected by the object to be measured is received by the light receiving portion 94b. Therefore, the output signal of the distance sensor 94 changes according to the distance from the light emitting section 91a to the object to be measured. On the other hand, the measurement object changes depending on whether or not the filling socket 41 is connected to the filling plug 36 . Specifically, when the filling socket 41 is not connected to the filling plug 36, the filling plug 36 is the measurement object, and when the filling socket 41 is connected to the filling plug 36, the filling socket 41 is the measurement object. become things. Therefore, the output signal of the distance sensor 94 changes according to the connection state of the filling socket 41 to the filling plug 36 . Therefore, it is possible to detect whether or not the filling socket 41 is connected to the filling plug 36 based on the output signal of the distance sensor 94 .

On the other hand, in FIG. 11, an optical sensor 95 is provided near the filling plug 36 corresponding to the insertion position of the filling socket 41 with respect to the filling plug 36 . The optical sensor 95 is a transmissive optical sensor having a light emitting portion 95a and a light receiving portion 95b. A sensor optical axis 96 exists between the light emitting portion 95a and the light receiving portion 95b, and the light emitting portion 95a and the light receiving portion 95b face each other with the sensor optical axis 96 therebetween. The output signal of the optical sensor 95 is turned on when the light emitted from the light emitting part 95a is received by the light receiving part 95b, and is turned off when the light is not received by the light receiving part 95b. The sensor optical axis 96 is set at a position blocked by the filling socket 41 that is inserted into the filling plug 36 . Therefore, when the filling socket 41 is connected to the filling plug 36, the sensor light emitted from the light emitting portion 95a is blocked by the filling socket 41, so that the output signal of the optical sensor 95 is turned off. When the filling socket 41 is not connected to the filling plug 36, the sensor light emitted from the light emitting portion 95a is received by the light receiving portion 95b, so the output signal of the optical sensor 95 is turned on. Therefore, the output signal of the optical sensor 95 changes according to the connection state of the filling socket 41 with respect to the filling plug 36 . Therefore, it is possible to detect whether or not the filling socket 41 is connected to the filling plug 36 based on the output signal of the optical sensor 95 . Although a transmissive optical sensor is exemplified here, a reflective optical sensor can also be used.

Further, in the first embodiment, the spring member 54 as a biasing member is arranged between the push plate 51 and the plug mounting plate 68, but the present invention is not limited to this. Alternatively, a configuration in which a torsion coil spring as an urging member is attached to the hinge 52 (see FIG. 4) may be employed. Further, the biasing member is not limited to a spring member, and may be, for example, elastic rubber or the like. This point also applies to the second embodiment.

In the first embodiment, the FC controller 81 cuts off the permission line 87 when the output signal of the limit switch 53 is ON while the vehicle key switch 83 detects the key-on state. Although the operation of the vehicle main body of the forklift 10 is prohibited by doing so, the operation of the vehicle main body of the forklift 10 may be prohibited by cutting off the power supply line 86 instead of the permission line 87 . . The fact that the power supply line 86 is cut off instead of the permission line 87 can also be applied to the second embodiment.

Further, in Embodiments 1 and 2, when the permission line 87 is cut off by the FC controller 81, the operation of the vehicle body of the forklift 10 prohibited by the vehicle controller 82 is the traveling operation and the cargo handling operation. Although both are mentioned, it is not limited to this, and only the running motion may be prohibited.
Further, in the first embodiment, the FC controller 81 and the vehicle controller 82 are provided separately, but they may be controlled by one controller. This point also applies to the second embodiment.

Further, in Embodiment 1 above, the configuration in which the fuel cell unit 26 is not provided with the charging lid is adopted, but the present invention is not limited to this, and the configuration in which the fuel cell unit 26 is provided with the charging lid is also possible. , it is possible to control the industrial vehicle so that it does not run during filling of fuel gas. This point also applies to the second embodiment. However, in order to simplify the operator's filling operation, it is preferable to employ a configuration without a filling lid.

In addition, in Embodiment 1, the configuration in which the cover 29 is attached to the vehicle body portion 11 is adopted, but the present invention is not limited to this, and a configuration in which the cover 29 is not attached may be adopted. This point also applies to the second embodiment. However, in order to improve the design of the forklift 10, it is preferable to adopt the configuration in which the cover 29 is attached.

In addition, in the first embodiment, a fuel cell powered forklift was described as an example of a fuel cell powered industrial vehicle, but the present invention is not limited to this. may be applied to fuel cell industrial vehicles. This point also applies to the second embodiment.

10 forklift (fuel cell type industrial vehicle), 11 vehicle body (vehicle body), 14 cargo handling device (vehicle body), 26 fuel cell unit, 31 fuel tank, 36 filling plug, 41 filling socket, 45, 100 detection mechanism, 51 , 101 push plate (moving member), 53, 103 limit switch (sensor), 54, 104 spring member (biasing member), 71, 121 mover, 73, 123 cylindrical portion, 81 FC controller (control means), 82 vehicle controller (control means), 83 vehicle key switch.

Claims (5)

a fuel cell unit having a fuel cell;
a fuel tank provided in the fuel cell unit for storing fuel gas to be supplied to the fuel cell;
a vehicle body on which the fuel cell unit is mounted;
a control means for controlling the operation of the vehicle body;
with
The fuel cell unit is
a filling plug for filling the fuel tank with the fuel gas, the filling plug connectable to a filling socket for supplying the fuel gas;
a detection mechanism for detecting a connection state between the filling plug and the filling socket;
with
The detection mechanism has a sensor whose output signal changes according to the connection state of the filling socket with respect to the filling plug,
the control means controls to prohibit the operation of the vehicle main body when it is determined that the filling socket is connected to the filling plug based on the output signal of the sensor ;
The filling plug is configured to be removable from the filling socket,
The detection mechanism has a moving member that is pushed by the filling socket and moves in a predetermined direction when the filling socket is inserted into the filling plug,
the moving member is arranged to surround part of the outer peripheral surface of the filling plug;
The sensor has a mover that is pushed by movement of the moving member,
The output signal changes when the filling socket contacts the moving member, moving the moving member, and pushing the armature.
Fuel cell industrial vehicle. a fuel cell unit having a fuel cell;
a fuel tank provided in the fuel cell unit for storing fuel gas to be supplied to the fuel cell;
a vehicle body on which the fuel cell unit is mounted;
a control means for controlling the operation of the vehicle body;
with
The fuel cell unit is
a filling plug for filling the fuel tank with the fuel gas, the filling plug connectable to a filling socket for supplying the fuel gas;
a detection mechanism for detecting a connection state between the filling plug and the filling socket;
with
The detection mechanism has a sensor whose output signal changes according to the connection state of the filling socket with respect to the filling plug,
the control means controls to prohibit the operation of the vehicle main body when it is determined that the filling socket is connected to the filling plug based on the output signal of the sensor;
The filling plug is configured to be removable from the filling socket,
The detection mechanism has a moving member that is pushed by the filling socket and moves in a predetermined direction when the filling socket is inserted into the filling plug,
the moving member is arranged to surround part of the outer peripheral surface of the filling plug;
The sensor has a mover whose pressed state is released by movement of the moving member,
The output signal changes when the filling socket contacts the moving member, moves the moving member, and releases the push-in state of the mover.
Fuel cell industrial vehicle. 3. The fuel cell industrial vehicle according to claim 1 , further comprising a biasing member that biases the moving member in a direction opposite to the predetermined direction. The moving member is provided with a cylindrical portion,
4. The fuel cell industrial vehicle according to claim 3 , wherein one end of said biasing member is accommodated in said cylindrical portion. Equipped with a vehicle key switch that detects the key-on state,
The control means controls the operation of the vehicle main body when the vehicle key switch detects the key-on state and determines that the filling socket is connected to the filling plug based on the output signal of the sensor. The fuel cell-powered industrial vehicle according to any one of claims 1 to 4 , which is controlled so as to prohibit it.

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