JP2005125956A - Electric wire wiring structure for fuel battery vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure height on ground and to suppress influence of noise to a weak electric signal flowing in a low voltage wire by a high voltage wire by optimize arrangement of electric wiring and piping of a fluid. <P>SOLUTION: A fuel battery 9 is mounted below a floor of the vehicle. The high voltage wires 17, 19 connected to strong electric parts 13, 15 are wired between the fuel battery 9 and one side part of the vehicle toward a longitudinal direction of the vehicle. Whereas, the low voltage wire 25 connected to the weak electric part (parts modules 21, 23 self-containing a sensor) is wired between the fuel battery 9 and the other side part of the vehicle toward the longitudinal direction of the vehicle. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a wire routing structure for a fuel cell vehicle.

A fuel cell vehicle in which the fuel cell is mounted under the floor of the vehicle is described in Patent Document 1 below.
JP 2001-71753 A

  In general, it is preferable to arrange the pipes mounted on the vehicle and the brackets for fixing these pipes as close as possible in view of sharing the brackets and simplifying the assembling work.

  However, a vehicle using a fuel cell as a power source requires more parts than a vehicle equipped with a conventional internal combustion engine, the number of actuators and sensors increases, and the number of electric wires and fluid piping connecting them increases.

  For this reason, when these increasing electric wires and pipes are combined in one place, the cross-sectional area is large, and it is difficult to secure the ground height under the floor.

  At the same time, the high voltage wiring in the electrical wiring system until the high voltage power generated by the fuel cell is consumed by the drive motor may cause noise to weak electric signals such as sensor signals flowing through the low voltage wiring. .

  Therefore, the present invention aims to secure ground clearance and to suppress the influence of noise on the weak electric signal flowing in the low voltage wiring by the high voltage wiring by optimizing the arrangement of the electric wiring and the fluid piping. Yes.

  In the present invention, a fuel cell is mounted under the vehicle floor, and between the fuel cell and one side portion of the vehicle, a high voltage wiring connected to a high voltage component is routed in the vehicle front-rear direction, The most important feature is that a low-voltage wiring connected to the weak electrical component is routed between the fuel cell and the other side portion of the vehicle in the longitudinal direction of the vehicle.

  According to this invention, the high-voltage wiring is arranged between the fuel cell and one side of the vehicle, and the low-voltage wiring is arranged between the fuel cell and the other side of the vehicle in the vehicle front-rear direction. Therefore, it is possible to reduce the influence of noise on the weak electric signal that flows through the low-voltage wiring due to the high-voltage wiring, and by dispersing each electric wire on both sides of the fuel cell, the thickness in the height direction is suppressed and the height above the floor Can be secured.

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

  FIG. 1 is a plan view showing an electric wire arrangement structure for a fuel cell vehicle according to an embodiment of the present invention. Side members 1 serving as vehicle body side support structures are provided extending in the vehicle front-rear direction at lower portions on both sides in the vehicle width direction of the fuel cell vehicle. In addition, the direction shown by arrow FR in FIG. 1 is a vehicle front side, the code | symbol 3 shows a front wheel and 5 shows a rear wheel.

  A fuel cell support structure 7 is attached to the lower portion between the pair of side members 1 so as to connect the pair of side members 1 to each other. On the fuel cell support structure 7, a fuel cell 9 is mounted near the rear wheel 5 between the front wheel 3 and the rear wheel 5 at the center position in the vehicle width direction. That is, the fuel cell 9 is disposed under the vehicle floor. Here, the fuel cell 9 corresponds to a so-called fuel cell system including a control unit for starting and controlling the fuel cell main body.

  Between the left and right front wheels 3, a high-power component 13 composed of a drive motor and an inverter is disposed, and between the left and right rear wheels 5, a high-power component 15 composed of a DC / DC converter is disposed. . These high-power components 13 and 15 are supported by a vehicle body-side support structure (not shown).

  The fuel cell 9 and the high-power component (DC / DC converter) 15 are connected by the battery-side high-voltage wiring 17, and the high-power component (DC / DC converter) 15 and the high-power component (inverter) 13 are connected to the motor side. The high voltage wiring 19 is used for connection. Thereby, the electric power generated in the fuel cell 9 is transformed by the DC / DC converter, then converted from direct current to alternating current by the inverter, and supplied to the driving motor.

  Such high-voltage wirings 17 and 19 on the battery side and the motor side are routed in the vehicle front-rear direction between the fuel cell 9 and the right side which is one side of the vehicle. Although not shown, these high voltage wirings 17 and 19 are bundled together and fixed to the vehicle body by a bracket.

  In addition, component modules 21 and 23 each incorporating various sensors, which are weak electrical components, are installed in the fuel cell support structure 7 on the vehicle front side of the fuel cell 9.

  The component modules 21 and 23 and the fuel cell 9 are connected by a low voltage wiring 25. The low voltage wiring 25 is routed in the vehicle front-rear direction between the fuel cell 9 and the left side which is the other side of the vehicle.

  Further, as shown in FIG. 2, the low voltage wiring 25 c led out from the component module 31 provided at the lower part of the front seat 29 is connected to the lower portion of the floor panel 33 at the portion 27 in the middle of the low voltage pipe 25 described above. It is led to the side part of the side member 1 and wired in the vehicle front-rear direction as a low voltage wiring 25. Although not shown in the drawing, these low voltage wirings 25 wired in the longitudinal direction of the vehicle are bundled together and fixed to the vehicle body by a bracket.

  The low voltage wiring 25 is connected to the component modules 21 and 23 and other component modules (not shown) by being pulled in from the vehicle front side by the low voltage connection wiring 25a, and to the fuel cell 9, the low voltage connection wiring 25b. To pull in from the rear side of the vehicle and connect. Further, the low voltage wiring 25 is arranged as a low voltage connection wiring 25d from the rear side of the fuel cell 9 to the front side and connected to a necessary part of the front end portion of the fuel cell 9 or another component module. .

  A hydrogen tank (not shown) is installed in the vicinity of the rear wheels 5 behind the fuel cell 9, and flows when the hydrogen in the hydrogen tank is supplied to the fuel cell 9, or surplus discharged from the fuel cell 9 The hydrogen pipe 35 through which hydrogen flows is provided at the same position as the low-voltage electric wire 25, that is, between the fuel cell 9 and the left side which is the other side of the vehicle, in the vehicle longitudinal direction, And the vehicle front side of the fuel cell 9 are connected.

  On the other hand, an air pipe 37 for supplying air to the fuel cell 9 is directly connected to the rear fuel cell 9 from an air intake port (not shown) at the front of the vehicle. Further, a cooling water pipe 39 through which cooling water for cooling the fuel cell 9 flows is directly connected to the rear fuel cell 9 from a radiator (not shown) at the front of the vehicle.

  Further, a combustor 41 is installed in the fuel cell support structure 7 in front of the component module 23 and on the left side in the vehicle width direction of the component module 21. The combustor 41 is combusted using hydrogen and air in a hydrogen tank, and this combustion heat is used when heating the cooling water through the heat exchanger, for example, during the warm-up operation of the fuel cell 9.

  In order to avoid interference with the high voltage wirings 17 and 19, the exhaust pipe 43 of the combustor 41 is located at the same position as the low voltage electric wire 25, that is, the left side which is the fuel cell 9 and the other side of the vehicle. The vehicle is installed in the front-rear direction of the vehicle and is opened at the rear end of the vehicle.

  FIG. 3A is a schematic diagram showing the positional relationship between the fuel cell 9 and the electric wires and piping arranged on both sides thereof, as viewed from the rear of the vehicle. According to this embodiment, the high voltage wirings 17 and 19 are arranged between the fuel cell 9 and the right side of the vehicle, while the low voltage wiring is provided between the fuel cell 9 and the left side of the vehicle. 25, hydrogen pipe 35 and exhaust pipe 43 are arranged.

  Thus, since the high voltage wirings 17 and 19 and the low voltage wiring 25 are arranged on the opposite sides with the fuel cell 9 in between, the weak electric signal flowing through the low voltage wiring 25 by the high voltage wirings 17 and 19 is provided. It is possible to reduce the influence of noise on the sensor signal. Further, by dispersing the electric wires on both sides of the fuel cell 9, a high-voltage wiring 101, a low-voltage wiring 103, a hydrogen pipe or the like on one side of the fuel cell 9 as in the comparative example shown in FIG. Compared with the case where the piping 105 such as the exhaust pipe is routed together, the thickness in the height direction is suppressed, and the height above the floor base is easily secured.

  Further, at least one of a fluid supply pipe and a discharge pipe for the fuel cell 9, that is, the hydrogen pipe 35 here, the fuel cell 9 on which the low voltage wiring 25 narrower than the high voltage wirings 17 and 19 is arranged, and the other side of the vehicle. As a result, the space on both sides of the fuel cell 9 can be used efficiently. Further, since the hydrogen pipe 35 is close to the low voltage wiring 25, it is easy to share the bracket for fixing to the vehicle body, and the number of parts can be reduced.

  Furthermore, since the temperature of the hydrogen pipe 35 routed between the fuel cell 9 in which the low-voltage wiring 25 is disposed and the other side of the vehicle becomes lower than the ambient temperature due to the reduced pressure, the low-voltage wiring 25 is High-temperature specification electric wires and protective materials can be eliminated, and component costs can be reduced.

  Instead of the hydrogen pipe 35 described above, a cooling water pipe 39 whose fluid temperature does not exceed 90 degrees may be routed between the fuel cell 9 and the other side of the vehicle. And the cooling water pipe 39 may be routed. That is, the piping arranged between the fuel cell 9 and the other side surface of the vehicle includes a cooling water piping 39 through which cooling water for cooling the fuel cell 9 flows and a hydrogen piping through which hydrogen supplied to the fuel cell 9 flows. 35 and at least one of them.

  Moreover, since the low voltage wiring 25 is wired toward the fuel cell 9 from the vehicle longitudinal direction of the fuel cell 9 arranged under the floor as the low voltage connection wirings 25a and 25b, the side opening of the fuel cell 9 is enlarged so much. Therefore, it is possible to route between the air pipe 37 and the cooling water pipe 39 in parallel with these pipes, and the space utilization can be improved in the layout.

  Furthermore, since the low voltage wiring 25 is routed along the side of the vehicle, it is not necessary to provide the fuel cell support structure 7 with a cutout or the like for allowing the low voltage wiring 25 to pass in the vehicle width direction. The strength reduction of the support structure 7 can be prevented.

  Even if the exhaust pipe 43 connected to the combustor 41 is arranged on the same side as the low-voltage wiring 25, the low-voltage wiring 25 is routed from the vehicle front-rear direction to the fuel cell 9 under the floor. It can be routed without straddling the exhaust pipe 43 at a higher temperature in the vicinity of 41, and the low-voltage wiring 25 can eliminate the need for high-temperature specification electric wires and protective materials, thereby reducing component costs.

  According to the present invention, since at least one of the fluid supply pipe and the discharge pipe for the fuel cell is routed between the fuel cell in which the low voltage wiring is routed and the other side portion of the vehicle, Both side spaces can be used efficiently. In addition, since at least one of the fluid supply pipe and the discharge pipe is close to the low voltage wiring, it is easy to share the bracket for fixing to the vehicle body, and the number of parts can be reduced.

  The piping that is routed between the fuel cell and the other side of the vehicle is at least one of a cooling water piping and a hydrogen piping that do not reach high temperatures. Electric wires and protective materials can be eliminated, and cost reduction can be achieved.

  Since the low-voltage wiring is connected to the fuel cell arranged under the vehicle floor from the front-rear direction of the vehicle, the low-voltage wiring can be routed without straddling the piping, and the thickness on the floor floor can be easily secured. In this case, it is possible to route low-voltage wiring parallel to the piping between the pipes without enlarging the side opening of the fuel cell so much, increasing the space utilization factor in layout. Can do.

  Since the exhaust pipe for flowing the exhaust discharged from the combustor mounted on the vehicle is arranged between the fuel cell in which the low voltage wiring is arranged and the other side portion of the vehicle, the exhaust pipe has a higher temperature near the combustor. It can be routed without straddling the exhaust pipe, and low-voltage wiring can eliminate the need for high-temperature electric wires and protective materials, thus achieving a reduction in cost.

It is a top view which shows the electric wire arrangement structure of the fuel cell vehicle concerning one Embodiment of this invention. It is front sectional drawing seen from the vehicle front which shows the structure which draws in a low voltage wiring from a vehicle interior under a vehicle floor. BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic diagram which shows the positional relationship of the electric wire and piping seen from the vehicle back, (a) shows this invention which has arrange | positioned the electric wire and piping on both sides of a fuel cell, (b) shows the electric wire on one side of the fuel cell. A comparative example in which pipes and pipes are arranged is shown.

Explanation of symbols

9 Fuel cell 13, 15 High power component 17, 19 High voltage wiring 21, 23, 31 Component module with built-in various sensors that are weak electrical components 25 Low voltage wiring 35 Hydrogen piping (with fluid supply piping and fuel discharge piping to fuel cell At least one)
39 Cooling water pipe 41 Combustor 43 Exhaust pipe

Claims (5)

   A fuel cell is mounted under the vehicle floor, and a high voltage wiring connected to a high-voltage component is routed between the fuel cell and one side of the vehicle in the vehicle front-rear direction. An electric wire routing structure for a fuel cell vehicle, characterized in that a low voltage wiring connected to a weak electrical component is routed between the other side portion of the vehicle in the vehicle longitudinal direction.   The wire arrangement structure for a fuel cell vehicle according to claim 1, wherein at least one of a fluid supply pipe and a discharge pipe for the fuel cell is connected to the other of the fuel cell and the vehicle in which the low voltage wiring is routed. An electric wire routing structure for a fuel cell vehicle, characterized in that the wiring is routed between side portions.   3. An electric wire routing structure for a fuel cell vehicle according to claim 2, wherein the piping routed between the fuel cell and the other side portion of the vehicle is a cooling water piping for flowing cooling water for cooling the fuel cell. And a fuel pipe wiring structure for a fuel cell vehicle, characterized in that at least one of a hydrogen pipe through which hydrogen supplied to the fuel cell flows.   4. An electric wire wiring structure for a fuel cell vehicle according to claim 2 or 3, wherein the low voltage wiring is connected to a fuel cell disposed under the vehicle floor from the vehicle front-rear direction. Routing structure.   3. An electric wire routing structure for a fuel cell vehicle according to claim 2, wherein an exhaust pipe through which exhaust gas discharged from a combustor mounted on the vehicle flows is connected to the other of the fuel cell and the other vehicle on which the low voltage wiring is routed. An electric wire routing structure for a fuel cell vehicle, characterized in that the low voltage wiring is connected to a fuel cell arranged below the vehicle floor from the vehicle front-rear direction.

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