JP5721010B2 - Fuel cell vehicle - Google Patents

Description

  The present invention relates to a fuel cell vehicle including a converter for converting electric power of a fuel cell, under the floor of the vehicle.

  A so-called fuel cell vehicle is equipped with a fuel cell that generates electric power by an electrochemical reaction of reaction gases (fuel gas and oxidizing gas), a converter that converts electric power of the fuel cell, and the like. The fuel cell and the converter may be provided under the floor of the fuel cell vehicle.

  For example, the fuel cell stack is accommodated in a center tunnel as a center console, and auxiliary equipment such as a heater and a DC-DC converter connected to the fuel cell stack by piping and wiring are arranged between the center frame and the side frame. The thing is known (refer patent document 1).

JP 2007-15612 A

  However, as described above, when the converter is arranged under the floor of the vehicle, the height of the floor surface of the vehicle becomes high, and it becomes difficult to secure a sufficient cabin space. In particular, as the output of the fuel cell is increased, the converter is increased in size, so that it is difficult to accommodate the converter under the floor while securing a sufficient vehicle compartment space.

  Further, when the converter is disposed under the floor of the vehicle, it is desired to improve the rigidity of the converter case so as to maintain space in order to protect insulation of the reactor, the control board, and the like inside the converter from external input to the vehicle.

  The present invention has been made in view of the above points, and an object of the present invention is to improve the rigidity of a converter with respect to an external input while securing a vehicle compartment space in a fuel cell vehicle including a converter under the floor of the vehicle.

  The present invention for achieving the above object is a fuel cell vehicle including a converter for converting the power of the fuel cell, under the floor of the vehicle, wherein a plurality of reactors are disposed in the converter case of the converter, A rib that is recessed inward is formed on the lower surface of the converter case, and the rib is formed at a position where the reactor does not exist when viewed from above, and a vehicle frame is disposed at the position where the rib is located on the converter case. Thus, the fuel cell vehicle is provided with a mount for fixing the converter to the vehicle frame.

  According to the present invention, since the rib is formed in the portion where there is no reactor when viewed from the plane of the lower surface of the converter case, the rib is formed using the dead space in the converter case, thereby increasing the rigidity of the converter case. Can do. Moreover, since the rib is formed so as to be recessed inward, the converter case can be made compact accordingly. Furthermore, since the vehicle frame is disposed at a position where the rib is present, the height of the converter can be suppressed accordingly. Therefore, a vehicle compartment space can be secured.

  The mount may be provided at a position corresponding to a region where the reactor is disposed. In such a case, since the mount is provided at a position corresponding to the region where the heavy reactor is present, the converter can be fixed to the vehicle frame near the center of gravity. As a result, the moment due to the load applied to the converter in accordance with the speed change during traveling of the vehicle can be reduced. For example, the converter can be fixed to a lighter vehicle frame. Therefore, the weight of the vehicle can be reduced.

  The plurality of reactors may be arranged side by side so that a gap is formed at a predetermined position when viewed from above, and the rib may be formed at a position corresponding to the gap on the lower surface of the converter case.

  The plurality of reactors may be arranged symmetrically with respect to the gap, and the mount may be provided at a position corresponding to the gap. In this case, the center of gravity of the converter is formed near the gap, and the mount is provided at a position corresponding to the gap having the center of gravity, so that the converter can be fixed closer to the center of gravity. Therefore, the moment by the load added to a converter with the speed change at the time of driving | running | working of a vehicle can further be reduced, for example, a converter can be fixed to a lighter vehicle frame. Therefore, the vehicle can be reduced in weight.

  ADVANTAGE OF THE INVENTION According to this invention, when arrange | positioning a converter under the floor of a vehicle, the rigidity of the converter with respect to an external input can be improved, ensuring a vehicle interior space.

It is a schematic diagram which shows the structure of the electric system of the fuel cell system mounted in a fuel cell vehicle. It is sectional drawing of the vehicle which shows the installation example of the converter in a fuel cell vehicle. It is explanatory drawing of the longitudinal cross-section which shows the internal structure of a converter. It is explanatory drawing of the cross section which shows the internal structure of a converter.

  Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. As shown in FIG. 1, the fuel cell vehicle 1 according to the present embodiment includes a fuel cell system 10.

  The fuel cell system 10 includes, for example, a fuel cell 20, a converter 21, an inverter 22, a battery 23, a battery converter 24, a traction motor 25, a sensor group 26, a controller 27, and the like.

  The fuel cell 20 is, for example, a polymer electrolyte fuel cell including a cell stack (cell stack) in which a plurality of cells (power generation cells) are stacked. In the fuel cell 20, fuel gas is supplied to the anode electrode side, and oxidizing gas is supplied to the cathode electrode side, and power is generated by an electrochemical reaction between the fuel gas and the oxidizing gas. The fuel cell 20 is provided with a voltage sensor for detecting the output voltage from the cell stack and a current sensor (none of which is shown) for detecting the output current.

  Converter 21 changes the output voltage of fuel cell 20. The battery 23 functions as a surplus power storage source, a regenerative energy storage source at the time of regenerative braking, and an energy buffer at the time of load fluctuation accompanying acceleration or deceleration of the fuel cell vehicle 1. The input / output voltage of the battery 23 is adjusted by the battery converter 24. The inverter 22 converts DC power output from the fuel cell 20 or the battery 23 into three-phase AC power and outputs it to the traction motor 25.

  The traction motor 25 is a drive source of the fuel cell vehicle 1 and generates regenerative power during deceleration. The rotation by the traction motor 25 is decelerated to a predetermined number of rotations by the reduction device 30 and transmitted to the tire 31 via the shaft.

  The controller 27 is a computer system for controlling the fuel cell system 10 and includes, for example, a CPU, a RAM, a ROM, and the like. The controller 27 is based on various signals output from the sensor group 26 (for example, a signal indicating the accelerator opening, a signal indicating the vehicle speed, a signal indicating the output current of the fuel cell 20 and the output terminal voltage, etc.). 20, the converter 21, the inverter 22, etc. are controlled to supply predetermined required power to the traction motor 25.

  The fuel cell vehicle 1 according to the present embodiment has a structure in which at least the converter 21 is disposed below the floor plate 41 of the passenger compartment 40 as shown in FIG. The converter 21 is disposed in a center tunnel 50 disposed between the left and right seats 42 of the fuel cell vehicle 1, for example. Converter 21 is provided along a center line extending in the front-rear direction of vehicle 1. The converter 21 is fixed to a vehicle frame A that extends in the left-right direction of the vehicle 1, for example.

  The converter 21 includes a converter case 70 that is divided into an upper case 70a and a lower case 70b. In the converter case 70, for example, as shown in FIG. 3, a reactor unit 80, an IPM (Intelligent Power Module) 81, and a control board 82 are provided in this order from the bottom.

  The IPM 81 includes, for example, a power device that controls power, such as a power MOSFET and an insulated gate bipolar transistor (IGBT), a drive circuit for the power device, a self-protection function, and the like. The control board 82 includes a control circuit that controls the IPM 81.

  The reactor unit 80 includes a plurality of reactors 90. For example, the reactors 90 are arranged in two upper and lower stages, and a plurality of, for example, four reactors 90 are arranged in the front-rear direction (the same as the front-rear direction of the vehicle 1). The plurality of reactors 90 are divided into a first reactor group 92 on the front side and a second reactor group 92 on the rear side, and the same number of reactors 90 are included in each of the first reactor group 91 and the second reactor group 92. They are arranged in the same shape. Between the 1st reactor group 91 and the 2nd reactor group 92, the gap | interval D wider than the space | interval of the reactors in each reactor group is provided. The gap D is set to be approximately the same as or wider than the width of the vehicle frame A, for example. With this configuration, the plurality of reactors 90 are arranged symmetrically in the front-rear direction across the gap D. Since reactor 90 is heavier than other members, the ratio of reactor 90 to the total weight of converter 21 is large. Therefore, the center of gravity of the converter 21 is in the vicinity of the gap D.

  A rib (reinforcing portion) 100 that is recessed inward (upper side) is formed in a portion corresponding to the gap D in the center portion of the lower surface of the converter case 70. The rib 100 is formed along the left-right direction of the converter 21 as shown in FIG.

  A mount 101 for fixing the converter 21 to the vehicle frame A is formed on the side surface of the converter case 70 in the left-right direction. Mount 101 protrudes outward from the side surface of converter case 70, and a bolt hole for fastening to vehicle frame A is formed at the center thereof. The converter 21 is fixed to the vehicle frame A by a bolt 110 that passes through a bolt hole of the mount 101, for example.

  The mount 101 is provided at a position corresponding to a region R where the reactor 90 is present when viewed from the plane. The mount 101 is provided in the center of the region R, for example, at the position of the gap D. As shown in FIG. 3, the mount 101 fixes the converter 21 to the vehicle frame A so that the vehicle frame A passing under the converter 21 in the left-right direction corresponds to the position where the rib 100 is located.

  According to the present embodiment, rib 100 is formed at a portion where there is no reactor 90 when viewed from the plane of the lower surface of converter case 70. Therefore, rib 100 is formed using the dead space in converter case 70, The rigidity of the case 70 can be increased. Moreover, since the rib 100 is formed so as to be recessed inward, the converter case 70 can be made compact accordingly. Furthermore, since the vehicle frame A is disposed at a position where the rib 100 is present, the height of the converter 21 can be suppressed accordingly. Therefore, a vehicle compartment space can be secured.

  Since mount 101 is provided at a position corresponding to region R where reactor 90 having a center of gravity is disposed, converter 21 can be fixed to vehicle frame A near the center of gravity. As a result, the moment due to the load applied to the converter 21 along with the speed change during traveling of the vehicle 1 can be reduced. For example, the converter 21 can be fixed to the lighter vehicle frame A. Therefore, the vehicle 1 can be reduced in weight.

  Further, the plurality of reactors 90 are arranged in line symmetry with the gap D therebetween, and the mount 101 is provided at a position corresponding to the gap D having the center of gravity, so that the converter 21 can be fixed closer to the center of gravity. As a result, the moment due to the load applied to the converter 21 along with the speed change during the traveling of the vehicle 1 can be further reduced. For example, the converter 21 can be fixed to the lighter vehicle frame A. Therefore, the vehicle 1 can be reduced in weight.

  The preferred embodiments of the present invention have been described above with reference to the accompanying drawings, but the present invention is not limited to such examples. It is obvious for those skilled in the art that various modifications or modifications can be conceived within the scope of the idea described in the claims, and these naturally belong to the technical scope of the present invention. It is understood.

  For example, the structure of the converter 21 in the above embodiment, the installation position of the converter 21 and the like are not limited to this, and the present invention can also be applied when the converter has other structures and other arrangements.

  INDUSTRIAL APPLICABILITY The present invention is useful for improving the rigidity of a converter with respect to an external input while securing a passenger compartment space when the converter is disposed under the floor of a vehicle.

DESCRIPTION OF SYMBOLS 1 Fuel cell vehicle 10 Fuel cell system 20 Fuel cell 21 Converter 70 Converter case 90 Reactor 100 Rib 101 Mount A Vehicle frame

Claims (4)

A fuel cell vehicle provided with a converter for converting the power of the fuel cell under the vehicle floor
A plurality of reactors are arranged in the converter case of the converter,
On the lower surface of the converter case, a rib recessed inside is formed,
The rib is formed at a position where the reactor does not exist when viewed from a plane,
The fuel cell vehicle, wherein the converter case is provided with a mount for fixing the converter to the vehicle frame so that the vehicle frame is disposed at a position with the rib.   The fuel cell vehicle according to claim 1, wherein the mount is provided at a position corresponding to a region where the reactor is disposed. The plurality of reactors are arranged side by side so that a gap is formed at a predetermined position when viewed from a plane,
The fuel cell vehicle according to claim 1, wherein the rib is formed at a position corresponding to the gap on a lower surface of the converter case. The plurality of reactors are arranged symmetrically with respect to the gap,
The fuel cell vehicle according to claim 3, wherein the mount is provided at a position corresponding to the gap.

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