JP2005212513A - Vehicle mounting structure of fuel cell system - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent decrease of road clearance of a vehicle lower than desired height due to a fuel cell system mounted underfloor while securing a desired indoor space. <P>SOLUTION: A fuel cell 11 is arranged at a position below in the vertical direction of the vehicle in a seat movable range of a front side seat 56f and a position below a front side projected part 57 of a car body floor 51. A center tunnel part 61 extended in the longitudinal direction of the vehicle and projected indoor is provided a roughly central part in the car width direction of the car body floor 51 on the rear side of the vehicle, and a hydrogen tank 14 is arranged in the inside of the center tunnel part 61. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a vehicle mounting structure for a fuel cell system.

2. Description of the Related Art Conventionally, there is known a fuel cell vehicle in which a fuel cell is mounted as a driving power source and a traveling motor is driven by power generated by the fuel cell.
In such a fuel cell vehicle, the fuel cell box containing the fuel cell and the auxiliary unit of the fuel cell is mounted from below on the vehicle body frame under the floor of the fuel cell vehicle, and the fuel tank is located behind the fuel cell box. There is known a fuel cell vehicle mounted on the vehicle from below (for example, see Patent Document 1).
JP 2003-291857 A

However, in this fuel cell vehicle, since the fuel cell box is mounted so that the fuel cell unit is suspended from below the vehicle body frame under the floor, the fuel cell box is directed downward in the vehicle vertical direction from the lower end of the vehicle body frame. It protrudes. For this reason, there is a problem in that when the floor surface of the fuel cell vehicle is lowered, there is a problem that it is difficult to secure a desired vehicle interior space when it is set to ensure a predetermined ground clearance. Arise.
The present invention has been made in view of the above circumstances, and a fuel cell system vehicle capable of preventing a ground clearance of the vehicle from being lowered below a desired height while securing a desired vehicle interior space. An object is to provide a mounting structure.

  In order to solve the above problems and achieve the object, the fuel cell system mounting structure for a fuel cell system according to claim 1 of the present invention is configured such that the fuel cell (the fuel cell 11 in the embodiment) is disposed below the vehicle body floor. Thus, the seat (the front seat 56f in the embodiment) is disposed at a position below the movable range, and the vehicle body floor below the seat is formed so as to rise upward.

  According to the vehicle mounting structure of the fuel cell system configured as described above, the vehicle body floor projects toward the seat at a position below the seat movable range in which it is relatively easy to secure the accommodation space in the vehicle interior, and the fuel is disposed below the vehicle body floor. By disposing various components of the fuel cell system including the battery, it is possible to prevent the ground height of the fuel cell from being lower than the desired height while securing a desired vehicle interior space.

  Furthermore, in the vehicle mounting structure of the fuel cell system according to the second aspect of the present invention, the fuel cell is disposed at a position above the lower end of the vehicle body frame extending in the vehicle front-rear direction and below the vehicle body floor. It is characterized by that.

  According to the vehicle mounting structure of the fuel cell system configured as described above, the fuel cell is prevented from projecting downward in the vehicle vertical direction from the lower end of the vehicle body frame, and the fuel cell is protected from obstacles on the road surface by the vehicle body frame. can do.

  Furthermore, in the vehicle mounting structure of the fuel cell system according to the third aspect of the present invention, the fuel tank (hydrogen tank 14 in the embodiment) is disposed below the vehicle body floor and below the center tunnel. It is characterized by that.

  According to the vehicle mounting structure of the fuel cell system configured as described above, the fuel tank can be disposed below the vehicle body floor as in the case of the fuel cell, and further, since the fuel tank is disposed below the center tunnel, It is possible to prevent the ground height of various components of the fuel cell system including the fuel cell and the fuel tank from being lower than the desired height while securing a desired vehicle interior space.

According to the vehicle mounting structure of the fuel cell system of the present invention, the ground clearance of the various components of the fuel cell and the fuel cell system is prevented from being lower than the desired height while ensuring the desired vehicle interior space. be able to.
Furthermore, according to the vehicle mounting structure of the fuel cell system of the present invention as set forth in claim 2, it is possible to prevent the vehicle floor from being raised at an inappropriate position and to secure a desired vehicle interior space. It can prevent that the ground height of a battery falls rather than desired height. Accordingly, the fuel cell can be prevented from projecting downward in the vehicle vertical direction from the lower end of the vehicle body frame, and the fuel cell can be protected from the obstacles on the road surface by the vehicle body frame.
Furthermore, according to the vehicle mounting structure of the fuel cell system of the present invention as set forth in claim 3, the fuel cell and the fuel tank can be arranged below the vehicle body floor, so that the fuel cell can be secured while ensuring a desired vehicle interior space. In addition, it is possible to prevent the ground height of the fuel tank from falling below a desired height, and to increase the degree of freedom in designing the rear part of the vehicle body by arranging the fuel tank below the vehicle body floor. it can.

Hereinafter, a vehicle mounting structure of a fuel cell system according to an embodiment of the present invention will be described with reference to the accompanying drawings.
As shown in FIG. 1, for example, the fuel cell system 10 according to the present embodiment includes a fuel cell 11, an air supply device 12, a humidifier 13, a hydrogen tank 14, a fuel supply control valve 15, and an ejector 16. A fuel pump 17, a dilution box 18, a purge valve 19, a current controller 20, and a central control unit (ECU) 21. The fuel cell system 10 includes a traveling motor 31, an output controller (PCU) 32, and a capacitor 33.

The fuel cell 11 sandwiches a solid polymer electrolyte membrane composed of a cation exchange membrane or the like between a fuel electrode (anode) composed of an anode catalyst and a gas diffusion layer and an oxygen electrode (cathode) composed of a cathode catalyst and a gas diffusion layer. The electrolyte electrode structure is formed by stacking a large number of fuel cell units sandwiched by a pair of separators, and the fuel cell stack is sandwiched from both sides in the stacking direction by a pair of end plates. Yes.
Air, which is an oxidant gas (reactive gas) containing oxygen, is supplied to the cathode of the fuel cell 11 from the air supply device (S / C) 12 and is appropriately humidified by the humidifier 13 and then introduced into the anode. The fuel gas (reactive gas) made of hydrogen is supplied from the high-pressure hydrogen tank 14 through the fuel supply control valve 15 and the ejector 16. The hydrogen ionized by the catalytic reaction on the anode catalyst of the anode moves to the cathode through the moderately humidified solid polymer electrolyte membrane, and the electrons generated by this movement are taken out to the external circuit and DC It is used as electrical energy. At this time, at the cathode, hydrogen ions, electrons and oxygen react to produce water.

The number of rotations of a motor (not shown) for driving an air supply device (S / C) 12 including an air compressor is based on a control command input from the ECU 21 and includes, for example, a PWM inverter by pulse width modulation (PWM). Controlled by the S / C controller 12 a, the S / C controller 12 a is connected in parallel to the current controller 20 and the capacitor 33.
The humidifier 13 is configured to include a water permeable membrane such as a hollow fiber membrane, for example, and the exhaust air discharged from the air discharge port 11b of the fuel cell 11 is used as a reaction gas from the air supply device (S / C) 12 to the air. It is used as a humidified gas for the air supplied to the supply port 11a. That is, when air and exhaust air are brought into contact with each other through the water permeable membrane, moisture (particularly, water vapor) contained in the exhaust air is supplied to the air as water vapor after passing through the membrane hole of the water permeable membrane.
Further, the exhaust air discharged from the humidifier 13 is introduced into a dilution box 18 described later.

Hydrogen as fuel for the fuel cell 11 is first supplied from the high-pressure hydrogen tank 14 to the fuel supply control valve 15.
The fuel supply control valve 15 is, for example, a pneumatic proportional pressure control valve, and hydrogen that has passed through the fuel supply control valve 15 is obtained by using the pressure of air supplied from the air supply device (S / C) 12 as a signal pressure. The pressure at the outlet of the fuel supply control valve 15 is set to be within a predetermined range corresponding to the signal pressure.
The hydrogen that has passed through the fuel supply control valve 15 flows through the ejector 16 and is supplied from the hydrogen supply port 11 c to the anode of the fuel cell 11.
Further, a part of the unreacted exhaust gas discharged from the hydrogen discharge port 11d of the fuel cell 11 is introduced into the ejector 16 through the hydrogen pump 17, and the hydrogen supplied from the hydrogen tank 14 and the fuel cell 11 The exhaust gas discharged from the fuel is mixed and supplied to the fuel cell 11 again.
The ejector 16 sucks a part of the exhaust gas from the fuel cell 11 that is made a secondary flow by the negative pressure generated in the vicinity of the high-speed hydrogen gas flow that circulates inside, and this exhaust gas is supplied from the hydrogen tank 14. The exhaust gas discharged from the fuel cell 11 is circulated by being mixed with hydrogen and supplying the fuel cell 11 again.
Further, the exhaust gas discharged from the hydrogen discharge port 11d of the fuel cell 11 is introduced into the dilution box 18 through a discharge control valve 17a that is controlled to open and close by the ECU 21.
The dilution box 18 mixes the unreacted exhaust gas discharged simultaneously with the air discharged from the cathode when the water accumulated in the anode of the fuel cell 11 or the nitrogen mixed in the hydrogen is discharged to the outside. As a result, the hydrogen concentration is reduced to a predetermined concentration or less, and then discharged to the outside (in the atmosphere or the like) via the purge valve 19.

The generated current extracted from the fuel cell 11 is input to the current controller 20, and the current controller 20 is connected to a capacitor 33 that is an electric storage device, for example, an electric double layer capacitor or an electrolytic capacitor. .
The current controller 20 is configured to include, for example, a DC-DC chopper and the like, and controls the current value of the generated current extracted from the fuel cell 11 based on the current command value output from the ECU 21, that is, the power generation command for the fuel cell 11. To do.
The fuel cell 11 and the capacitor 33 control, via the current controller 20, an output controller 32 that controls the traveling motor 31 and a motor (not shown) that drives the air supply device (S / C) 12. It is connected in parallel to an electrical load such as the S / C controller 12a.

Below, the vehicle mounting structure of the fuel cell system 10 provided with the said structure is demonstrated.
For example, as shown in FIGS. 2 to 4 (a) and 4 (b), side sills 52 and 53 that extend along the longitudinal direction of the vehicle body are formed at both ends of the lower surface 51A of the vehicle body floor 51 in the vehicle width direction. Is connected.
The side sills 52 and 53 are placed on both ends in the vehicle width direction on the upper surface 54A of the support frame 54 that supports the fuel cell system 10, and the lower portions of the side sills 52 and 53 face through holes that penetrate the support frame 54. The side sills 52 and 53 and the support frame 54 are fixed by attaching fastening members 55 such as bolts to the through holes and the fastening holes.
Here, the ground height of the support frame 54 (distance from the vehicle traveling road surface to the lower surface 54B of the support frame 54 along the upper and lower direction of the vehicle) h0 is set to be a predetermined constant value.
The vehicle body floor 51, which is the front portion of the vehicle body floor 51 in the vehicle front-rear direction and below the seat movable range of the front seat 56f, is located above the upper ends of the side sills 52 and 53 in the vehicle vertical direction. A front protrusion 57 is formed so as to protrude one step. A front seat 56f is placed on the upper surface 57A of the front protrusion 57, and further, the front protrusion 57 and the support frame 54 are positioned below the front protrusion 57 in the vehicle vertical direction. Thus, the fuel cell 11 and the capacitor 33 are arranged in a space formed so as to be sandwiched from both sides in the vehicle vertical direction.
The fuel cell 11 and the capacitor 33 are, for example, both ends of the support bands 58a and 58b mounted along the outer peripheral surfaces of the fuel cell 11 and the capacitor 33 exposed in a state of being placed on the upper surface 54A of the support frame 54. The portion is fixed to the support frame 54 by being fastened to the support frame 54 by fastening members 58c and 58d such as bolts.
Here, the ground clearance of the upper surface 57A of the front-side protrusion 57 on which the front seat 56f is placed (distance from the vehicle traveling road surface to the upper surface 57A of the front-side protrusion 57 along the vehicle vertical direction) h1 Is set to a predetermined constant value.

Further, at the rear portion of the vehicle body floor 51 in the vehicle front-rear direction, the vehicle is substantially stepped downward from the upper end portion of each side sill 52, 53 downward in the vehicle vertical direction, and is stepped on the upper surface 59A on the rear seat 56b. A rear-side protruding portion 60 extending in the vehicle front-rear direction is formed so as to protrude upward in the vehicle vertical direction from the seat placement portion 59 on which the vehicle is placed.
That is, the ground height of the upper surface 59A of the sheet placing portion 59 on which the rear seat 56b is placed (distance from the vehicle traveling road surface to the upper surface 59A of the sheet placing portion 59 along the vehicle vertical direction) h2. On the other hand, the ground height h3 of the upper surface 60A of the rear protrusion 60 is set to a larger value (h3> h2).
The hydrogen tank 14 is disposed in the center tunnel portion 61 formed so as to be sandwiched between the rear side protruding portion 60 and the support frame 54 from both sides in the vehicle vertical direction.
Here, on the upper surface 54A of the support frame 54, a tank mounting portion 62 having a concave contact surface 62A that comes into surface contact with a part of the outer peripheral surface of the hydrogen tank 14 is provided. A band 63 is attached along the exposed outer peripheral surface of the mounted hydrogen tank 14, and both ends of the band 63 are fixed to the tank mounting portion 62 by fastening members 64 such as bolts, whereby the hydrogen tank 14. Is fastened and fixed to the tank mounting portion 62.

The fuel cell 11 and the capacitor 33 are disposed below the seat movable range of the front seat 56f, and the hydrogen tank 14 is disposed in the center tunnel portion 61, whereby the hydrogen tank 14, the fuel cell 11 and the capacitor 33, Are set so as not to overlap each other in the vehicle vertical direction.
The ground height of the support frame 54 extends from the front part to the rear part in the vehicle front-rear direction (the lower surface 54B of the support frame 54 is formed in a flat surface along the vehicle vertical direction from the vehicle traveling road surface. The ground height 54 (the distance from the road surface of the vehicle to the lower surface 54B of the support frame 54 along the upper and lower direction of the vehicle) is set to be a predetermined constant value.

Further, in a front portion in the vehicle front-rear direction, a position below the vehicle body floor 51 and in a space formed so as to be sandwiched by the vehicle body floor 51 and the support frame 54 from both sides in the vehicle vertical direction, An output controller (PCU) 32 is arranged so as to be placed on the upper surface 54A of the support frame 54 at a position shifted from the battery 11 and the capacitor 33 toward the front rear rear side of the vehicle.
A travel motor 31 connected to drive wheels (front wheels) W is disposed at a position shifted forward and rearward of the vehicle from the output controller (PCU) 32.

As described above, according to the vehicle-mounted structure of the fuel cell system 10 according to the present embodiment, the fuel cell system including the fuel cell 11 at a position below the seat movable range in which it is relatively easy to secure the accommodation space in the vehicle interior. By arranging 10 various components, for example, by adjusting the structure of each seat 56f, 56b, the mounting structure of each seat 56f, 56b, etc., the fuel cell 11 and the fuel cell can be secured while securing a desired vehicle interior space. It is possible to prevent the ground height of various components of the system 10 from being lowered below a desired height, for example, the lower ends of the side sills 52 and 53.
In addition, the ground clearance of the vehicle body floor 51 can be prevented from increasing at an inappropriate position other than the seat movable range, and a desired vehicle interior space can be easily secured.

  In the above-described embodiment, the hydrogen tank 14 is disposed in the center tunnel portion 61 provided at the substantially central portion in the vehicle width direction at the rear portion of the vehicle body floor 51 in the vehicle front-rear direction. For example, as in the modification of the above-described embodiment shown in FIGS. 5 and 6, the vehicle body floor 51 is located at the rear portion of the vehicle body floor 51 in the vehicle front-rear direction and below the seat movable range of the rear seat 56b. The hydrogen tank 14 (for example, the two first and second hydrogen tanks 14a and 14b) may be disposed in a space formed so as to be sandwiched by the support frame 54 from both sides in the vehicle vertical direction.

  Further, in the above-described embodiment, the output controller (PCU) is provided on the upper surface 54A of the support frame 54 at a position shifted from the fuel cell 11 and the capacitor 33 toward the vehicle front rear front side in the front part in the vehicle longitudinal direction. However, the present invention is not limited to this. For example, as in the modification of the embodiment shown in FIG. 7, the positions above the fuel cell 11 and the capacitor 33, for example, the fuel cell 11 and the capacitor 33 are arranged inside. The output controller (PCU) 32 may be disposed on the upper portion of the substantially box-shaped box 61 accommodated in the box.

  In the modification shown in FIG. 7, the front side of the vehicle body floor 51 in the vehicle front-rear direction and adjacent to the upper surface 57 </ b> A of the front-side protruding portion 57 below the seat movable range of the front-side seat 56 f. A protruding portion 62 is formed between the seats 56f, 56f so as to protrude upward in the vehicle vertical direction and one step into the vehicle interior. And the output controller (PCU) 32 is arrange | positioned in the space formed so that it might be inserted | pinched from the both sides of the vehicle up-down direction by this protrusion part 62 and the upper part of the box 61. FIG. In this modification, fastening holes 63 are formed in the lower part of the output controller (PCU) 32 so as to face through holes penetrating the upper part of the box 61, and fastening members 63 such as bolts are provided in these through holes and fastening holes. As a result, the box 61 and the output controller (PCU) 32 are fixed. It should be noted that the box 61 for accommodating the fuel cell 11 and the capacitor 33 therein has both end portions of each support band 64 mounted along the outer peripheral surface exposed in a state of being placed on the upper surface 54A of the support frame 54. It is fixed to the support frame 54 by being fixed to the support frame 54 by a fastening member 65 such as a bolt.

In the above-described embodiment, the driving wheel W is a front wheel, but the present invention is not limited to this. For example, the driving wheel W may be a rear wheel and the traveling motor 31 may be disposed at the rear of the vehicle.
In this case, for example, the hydrogen tank 14 is disposed at a position below the seat movable range of the front side seat 56a or a center tunnel portion provided at a substantially central portion in the vehicle width direction at the front portion of the vehicle body floor 51 in the vehicle front-rear direction. The fuel cell 11 and the capacitor 33 are arranged at a position below the seat movable range of the rear side seat 56b, and further, the position shifted from the fuel cell 11 and the capacitor 33 toward the front rear rear side of the vehicle or the fuel cell 11 and the capacitor 33. The output controller (PCU) 32 may be disposed at an upper position, for example, an upper portion of a substantially box-shaped box that accommodates the fuel cell 11 and the capacitor 33 therein.

1 is a configuration diagram of a fuel cell system according to an embodiment of the present invention. It is a block diagram of the vehicle carrying the fuel cell system shown in FIG. It is a block diagram of the vehicle carrying the fuel cell system shown in FIG. 4A is a cross-sectional view taken along line AA shown in FIG. 2, and FIG. 4B is a cross-sectional view taken along line BB shown in FIG. It is a figure which shows the vehicle mounting structure of the fuel cell system which concerns on the modification of this Embodiment. It is a figure which shows the vehicle mounting structure of the fuel cell system which concerns on the modification of this Embodiment. It is CC sectional view taken on the line shown in FIG.

Explanation of symbols

10 Fuel Cell System 11 Fuel Cell 14 Hydrogen Tank (Fuel Tank)
51 Body floor 52, 53 Side sill (body frame)
57 Front protrusion (body floor)
61 Center tunnel

Claims (3)

The fuel cell is arranged below the vehicle body floor and below the movable range of the seat,
A vehicle mounting structure for a fuel cell system, wherein the vehicle body floor below the seat is formed so as to rise upward. 2. The vehicle mounting structure for a fuel cell system according to claim 1, wherein the fuel cell is disposed at a position above a lower end of a vehicle body frame extending in the vehicle front-rear direction and below the vehicle body floor. 3. The vehicle mounting structure for a fuel cell system according to claim 1, wherein a fuel tank is disposed at a position below the vehicle body floor and below the center tunnel.

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