JP2006160209A - Auxiliary unit mounting structure of fuel cell vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To enable disposition of a cooling water pump under a vehicle body without being interfered with the vehicle body, and efficiently perform priming and venting of the cooling water pump. <P>SOLUTION: In auxiliary unit mounting structure of a fuel cell vehicle, a stack for the fuel cell is disposed in an engine room in front of a vehicle, and the cooling water pump cooling the stack for the fuel cell on a main floor at the rear part of the engine. The auxiliary unit mounting structure, a center tunnel which matches the fore-and-aft direction of the vehicle and projects is provided on the main floor, and the cooling water pump which matches the longitudinal direction of the cooling water pump with the fore-and-aft direction of the vehicle is disposed in the center tunnel. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an auxiliary equipment mounting structure for a fuel cell vehicle, and more particularly to an auxiliary equipment mounting structure for a fuel cell vehicle which improves the position of the cooling water pump constituting the auxiliary equipment and improves the efficiency of the cooling water pump. is there.

  In vehicles, depending on the fuel used, a gasoline engine vehicle using gasoline, a diesel engine vehicle using heavy oil, etc., a gas fuel such as compressed natural gas (also referred to as “CNG”), a gas using so-called gas fuel It is roughly divided into an engine vehicle and a fuel cell vehicle using a fuel cell.

  For example, in a fuel cell vehicle, electric energy for driving a traveling motor is generated by the fuel cell system for the fuel cell vehicle. A fuel cell system for a fuel cell vehicle includes a fuel cell in which a large number of fuel cells are stacked (also referred to as a “fuel cell stack”), and supplies hydrogen gas to the fuel cell to generate electric energy for driving. A fuel cell vehicle is driven by driving a motor.

JP 2001-71753 A JP 2003-182624 A JP 2003-205754 A JP 2003-252252 A JP 2004-158279 A

  By the way, in the conventional fuel cell vehicle, when cooling the fuel cell stack and the auxiliary machine, if it is a water cooling system, a cooling water pump is required.

  The degree of freedom of the arrangement of the cooling water pump is high and depends on the position of the fuel cell stack and the layout of other auxiliary machines.

  However, due to the characteristics of the cooling water pump, it is desirable to dispose the cooling water pump at a low position in the cooling water path in order to perform necessary priming water and air bleeding.

  In addition, the “priming water” means that the impeller is immersed in sufficient water when the cooling water pump is turned. And if the impeller is not immersed in sufficient water, it will idle. In addition, the “air bleeding” means that the air in the cooling water pump and the cooling water pipe is extracted.

  In the vehicle body of the fuel cell vehicle, a cooling water pump may be disposed below the floor.

  However, if the cooling water pump is disposed below the floor, there is a limitation in the height above the ground, so the degree of freedom in layout is small, and if the piping is routed, sufficient pump performance cannot be obtained. .

  Therefore, in order to eliminate the above-mentioned inconveniences, the present invention provides a fuel cell stack in the engine room in front of the vehicle, and a cooling water pump for cooling the fuel cell stack in the main floor behind the engine room. In the fuel cell vehicle accessory mounting structure, a center tunnel is provided on the main floor so as to protrude upward in alignment with the longitudinal direction of the vehicle, and the longitudinal direction of the cooling water pump is set in the center tunnel in the longitudinal direction of the vehicle. The cooling water pumps are arranged so as to coincide with each other.

  As described above in detail, according to the present invention, the fuel cell stack is disposed in the engine room in front of the vehicle, and the cooling water pump for cooling the fuel cell stack is disposed in the main floor behind the engine room. In the battery car auxiliary equipment mounting structure, a center tunnel is provided on the main floor so as to protrude upward in line with the longitudinal direction of the vehicle, and the longitudinal direction of the cooling water pump is aligned with the longitudinal direction of the vehicle in the center tunnel. Since the pump is disposed, the cooling water pump can be disposed under the vehicle body without interfering with the vehicle body, and the cooling water pump can be efficiently primed and vented.

  As a result of the invention as described above, when the cooling water pump is disposed, the longitudinal direction is made to coincide with the longitudinal direction of the vehicle in the center tunnel protruding upward on the main floor so as to coincide with the longitudinal direction of the vehicle. The cooling water pump is disposed, and the cooling water pump is disposed under the vehicle body without interfering with the vehicle body, so that the cooling water pump is efficiently priming and bleeding.

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

  1 to 5 show an embodiment of the present invention. In FIG. 1, 2 is a main floor of a fuel cell vehicle (not shown).

  A pair of side members 4 extending in the front-rear direction on both sides of the fuel cell vehicle and forming a main frame are provided on the main floor 2 of the fuel cell vehicle as shown in FIGS.

  A fuel cell stack (not shown) is disposed in front of the side member 4, that is, in an engine room (not shown) in front of the vehicle, and the fuel cell stack is cooled on the main floor 2 behind the engine room. A cooling water pump 8 is provided.

  That is, the subframe 10 is fixed to the lower surface of the side member 4, and the auxiliary machine 12 for the fuel cell vehicle including the cooling water pump 8 is supported on the subframe 10 as shown in FIG.

  At this time, the sub-frame 10 is mounted on each lower surface of the side member 4 via a bracket 14, which is a mounting device, and extends in the front-rear direction. A pair of left and right first frames 16-1, 16 -2 and the pair of left and right first frames 16-1 and 16-2 and a plurality of second frames extending in the width direction between the left and right first frames 16-1 and 16-2. Two frames 18 and a plurality of second frames 18 include a third frame 20 extending in the vehicle front-rear direction and fixed to the lower surfaces of the pair of second frames 18.

  Further, the auxiliary machine 12 supported by the subframe 10 will be described. As shown in FIGS. 1 and 2, the auxiliary machine 12 is attached to the center of the subframe 10 so that the left and right sides are attached to both the left and right sides. Surplus spaces 22-1 and 22-2 are provided.

  That is, the auxiliary machine 12 includes the heat exchanger 12-1 and the auxiliary water cooling coolant pump 12-2 that is the first water pump, the stack cooling water pump 8 that is the second water pump, and the water pump inverter 12. -3, an air conditioner compressor 12-4, an air conditioner compressor inverter 12-5, a muffler 12-6, etc., as shown in FIGS. 1 and 2, in the center of the subframe 10 from the front of the vehicle body toward the rear of the vehicle body, Heat exchanger 12-1, cooling water pump 12-2 for cooling auxiliary equipment, cooling water pump 8 for cooling stack, inverter 12-3 for water pump, air conditioner compressor 12-4 and muffler 12-6, inverter 12 for air conditioner compressor The auxiliary machines 12 such as 5 are attached in a concentrated manner.

  The first valve 12-7 is attached to the left surplus space 22-1 side of the heat exchanger 12-1, and the first and second flow meters 12-2 are disposed on the right surplus space 22-2 side of the heat exchanger 12-1. 8, 12-9 are attached, and the second valve 12-10, the third flow meter 12-11 and the differential pressure gauge 12-12 are attached to the left side surplus space 22-1 side of the air conditioner compressor 12-4 and the muffler 14-6. A third valve 12-13 is attached to the left surplus space 22-1 side of the inverter 12-5 for the air conditioner compressor, and a fourth flow meter 12-14 is attached in the middle of the return path 48 for stack cooling described later.

  At this time, a center tunnel 24 is provided at the center portion of the main floor 2 in the vehicle width direction so as to protrude upward in alignment with the longitudinal direction of the vehicle, and the longitudinal direction of the cooling water pump 8 for stack cooling is provided in the center tunnel 24. Is configured so that the cooling water pump 8 for cooling the stack is disposed so as to coincide with the longitudinal direction of the vehicle.

  More specifically, as shown in FIG. 3, the main floor 2 is provided with a pair of side members 4 so as to extend in the front-rear direction on both sides of the fuel cell vehicle, and coincides with the front-rear direction of the vehicle. A center tunnel 24 protruding upward is provided, and an auxiliary machine cooling water pump 12-2, which is the auxiliary machine 12, is disposed on the lower surface of the main floor 2 at a position inside the pair of side members 4. Further, the stack cooling coolant pump 8 is disposed in the center side portion of the auxiliary coolant cooling water pump 12-2 and in the center tunnel 24 with the longitudinal direction thereof aligned with the longitudinal direction of the vehicle. It is.

  The heat exchanger 12-1 is disposed on the front side of the cooling water pump 8 for cooling the stack, as shown in FIGS. 1 and 2, and the heat exchanger 12-1 is disposed in the center tunnel 24. To do.

  Further, as shown in FIG. 1, the auxiliary machine cooling water pump 12-2 is supplied with an auxiliary machine cooling supply passage 26 for cooling the auxiliary machine 12 by supplying cooling water, and after cooling from the auxiliary machine 12. Auxiliary cooling return passage 30 for returning the cooling water to the suction port 28 of the auxiliary coolant cooling water pump 12-2.

  At this time, the auxiliary equipment cooling supply passage 26 includes an extension passage 34 having one end connected to a discharge port 32 provided at a side of the auxiliary equipment cooling water pump 12-2, and the other end of the extension passage 34. And a first supply passage for cooling by supplying cooling water from the chamber 36 to the auxiliary machine 12 such as a hydrogen circulation pump and a drive motor (not shown) via the first flow meter 12-8. 38, a second supply passage 40 for cooling the chamber 36 by supplying cooling water to the auxiliary machine 12 disposed in the engine room (not shown) via the second flow meter 12-9, and the chamber 36 to It comprises a third supply passage 42 that supplies cooling water to the air conditioner compressor inverter 12-5 through a third flow meter 12-11 for cooling.

  Further, as shown in FIG. 1, the cooling water pump 8 for stack cooling supplies a cooling water supply passage 44 for cooling the fuel cell stack by supplying cooling water, and cooling after cooling from the fuel cell stack. And a stack cooling return passage 48 for returning water to the suction port 46 of the stack cooling cooling water pump 8.

  At this time, the stack cooling supply passage 44 is connected to the discharge passage 50 provided at the side of the stack cooling coolant pump 8 at one end side, and the extension passage 52 is connected to the extension passage 52, and is connected to the fuel cell. It comprises an outlet passage 54 for cooling the stack by supplying cooling water.

  Then, when the discharge port 32 is provided at the side of the cooling water pump 12-2 for cooling the auxiliary machine, the extension passage 34 connected to the discharge port 32 is connected to the cooling for cooling the auxiliary machine as shown in FIG. The water pump 12-2 is formed to extend by a length a in the centrifugal direction.

  Similarly, when the discharge port 50 is provided in the side portion of the stack cooling coolant pump 8, the extension passage 52 connected to the discharge port 50 is connected to the stack cooling coolant pump 8 as shown in FIG. It is formed to extend by a length b in the centrifugal direction.

  At this time, as shown in FIGS. 1 and 5, the extension passage 52 of the cooling water pump 8 for cooling the stack is extended along the rear surface of the heat exchanger 12-1 and is continuous with the extension passage 52 and has a curved portion. The outlet passage 54 extending forward through 56 is provided, and the outlet passage 54 is disposed along the left side surface of the heat exchanger 12-1.

  Further, as shown in FIGS. 1 and 5, a heat exchanger 12-1 is disposed in front of the cooling water pump 8 on the left side in the vehicle width direction so that the cooling water pump 8 for stack cooling and the heat exchanger 12-1 are disposed. And the return passage 48 communicating with the suction port 46 provided in the front portion of the cooling water pump 8 for stack cooling is disposed on the left side of the heat exchanger 12-1. As shown in FIG. 1, the suction port 46 and the return passage 48 are arranged on a substantially straight line.

  Next, the operation will be described.

  When attaching the auxiliary machine 12 to the subframe 10, as shown in FIGS. 1 and 2, the heat exchanger 12-1 is used for cooling the auxiliary machine in the center of the subframe 10 from the front of the vehicle body to the rear of the vehicle body. The auxiliary machines 12 such as the cooling water pump 12-2, the stack cooling cooling water pump 8, the water pump inverter 12-3, the air conditioner compressor 12-4 and the muffler 12-6, and the air conditioner compressor inverter 12-5 are concentrated. And attach.

  When the sub-frame 10 is attached to the main floor 2, as shown in FIG. 3, the auxiliary machine 12 is the auxiliary machine 12 on the lower surface of the main floor 2 and inside the pair of side members 4. The cooling water pump 12-2 is positioned, and the stack is arranged such that the longitudinal direction coincides with the longitudinal direction of the vehicle in the center tunnel portion 24 and the center tunnel 24 with respect to the auxiliary machine cooling water pump 12-2. The cooling water pump 8 for cooling is located.

  As shown in FIGS. 1 and 2, the heat exchanger 12-1 disposed on the front side of the cooling water pump 8 for cooling the stack is also positioned in the center tunnel 24.

  Further, when the extension passage 34 is connected to the discharge port 32 provided on the side of the auxiliary equipment cooling water pump 12-2, as shown in FIG. It forms and connects in the centrifugal direction of the water pump 12-2.

  Similarly, when the extension passage 52 is connected to the discharge port 50 provided in the side portion of the stack cooling coolant pump 8, the extension passage 52 is connected to the stack cooling coolant pump 8 as shown in FIG. Form and connect in the centrifugal direction.

  Furthermore, as shown in FIGS. 1 and 5, the extension passage 52 of the cooling water pump 8 for stack cooling extends along the rear surface of the heat exchanger 12-1, continues to the extension passage 52, and The outlet passage 54 extending forward through the curved portion 56 is disposed along the side surface of the heat exchanger 12-1.

  When the stack cooling coolant pump 8 and the heat exchanger 12-1 are disposed, the stack cooling coolant pump 8 and the heat exchanger 12 are disposed as shown in FIGS. −1 are shifted in the width direction, and the return passage 48 that communicates the suction port 46 provided at the front of the stack cooling coolant pump 8 to the side of the heat exchanger 12-1. As shown in FIG. 1, the suction port 46 and the return passage 48 are arranged on a substantially straight line.

  As a result, a center tunnel 24 is provided on the main floor 2 so as to project upward in the vehicle front-rear direction, and the longitudinal direction of the cooling water pump 8 for cooling the stack coincides with the vehicle front-rear direction in the center tunnel 24. By disposing the stack cooling coolant pump 8, the stack cooling coolant pump 8 can be disposed below the vehicle body without interfering with the vehicle body. The priming water and air can be efficiently removed.

  Further, the heat exchanger 12-1 is disposed in front of the stack cooling coolant pump 8, and the heat exchanger 12-1 is disposed in the center tunnel 24, whereby the stack cooling coolant is provided. Since the coolant discharged from the pump 8 enters the heat exchanger 12-1 before entering the fuel cell stack, the coolant is discharged before the stack cooling coolant pump 8 at the center of the vehicle behind the fuel cell stack in front of the vehicle. The heat exchanger 12-1 is arranged, that is, the inlet gas is cooled to an optimum temperature so that the fuel cell can efficiently generate power between the fuel cell stack and the stack cooling water pump 8. -1 can flow cooling water efficiently, and by placing the heat exchanger 12-1 in the center tunnel 24 to use the space in the center tunnel 24, the heat exchanger 1 -1 without interfering to the vehicle body, it is possible to shorten the stack cooling water passage disposed in front of the stack-cooling the cooling water pump 8 which is arranged to further center tunnel 24.

  Further, a discharge port 32 is provided in a side portion of the auxiliary machine cooling coolant pump 12-2, and the extension passage 34 connected to the discharge port 32 is arranged in the centrifugal direction of the auxiliary machine cooling water pump 12-2. Similarly, a discharge port 50 is provided in a side portion of the stack cooling coolant pump 8, and the extension passage 52 connected to the discharge port 50 is formed in the centrifugal direction of the stack cooling coolant pump 8. As a result, the flow of the cooling water flowing out from the discharge ports 32, 50 can be sufficiently developed by the extension passages 34, 52 in the centrifugal direction, and the auxiliary coolant cooling water pump 12-2 and the stack cooling The efficiency of the cooling water pump 8 can be improved.

  Furthermore, the extension passage 52 of the cooling water pump 8 for stack cooling is extended along the rear surface of the heat exchanger 12-1, and continues to the extension passage 52 and extends forward through the curved portion 56. The outlet passage 54 is provided, and the outlet passage 54 is disposed along the side surface of the heat exchanger 12-1. Thus, the cooling water pump for stack cooling is utilized using the rear surface of the heat exchanger 12-1. Eight extension passages 52 can be provided, and the length of the outlet passage 54 can be shortened by using the side surface of the heat exchanger.

  Further, the stack cooling coolant pump 8 and the heat exchanger 12-1 are arranged shifted in the width direction, and in front of the stack cooling coolant pump 8 on the side of the heat exchanger 12-1. The return passage 48 communicating with the suction port 46 provided in the section is provided, and the suction port 46 and the return passage 48 are arranged in a substantially straight line, so that the heat exchanger 12-1 and the cooling for stack cooling are arranged. By shifting the water pump 8 in the width direction, a space for arranging the return passage 48 of the cooling water pump 8 for stack cooling can be formed on the side of the heat exchanger 12-1, thereby cooling water in the return passage 48. Can be returned efficiently.

It is a schematic plan view of the arrangement state of the main floor and auxiliary equipment showing an embodiment of the present invention. It is a schematic perspective view of the auxiliary machine arrange | positioned at the sub-frame. It is a schematic explanatory drawing of the cooling water pump arrange | positioned under the main floor. It is a general | schematic enlarged front view which shows the cooling water pump for auxiliary machine cooling, and the cooling water pump for stack cooling. It is a general | schematic enlarged rear view which shows the arrangement | positioning state of a heat exchanger and the cooling water pump for stack cooling.

Explanation of symbols

2 Main floor of fuel cell vehicle (not shown) 4 Side member 8 Cooling water pump ("cooling water pump for stack cooling")
DESCRIPTION OF SYMBOLS 10 Sub-frame 12 Auxiliary machine 12-1 Heat exchanger 12-2 Cooling water pump for auxiliary machine cooling which is the first water pump 12-3 Water pump inverter 12-4 Air conditioner compressor 12-5 Air conditioner compressor inverter 12-6 Muffler 12-7 First valve 12-8 First flow meter 12-9 Second flow meter 12-10 Second valve 12-11 Third flow meter 12-12 Differential pressure gauge 12-13 Third valve 12-14 Fourth Flow meter 14 Bracket 16-1 Left first frame 16-2 Right first frame 18 Multiple second frames 20 Third frame 22-1 Left surplus space 22-2 Right surplus space 24 Center tunnel 26 Supply passage for cooling auxiliary equipment 28 Suction port 30 Return passage for cooling auxiliary equipment 32 Discharge port 34 Extension passage 36 Chamber 38 First supply Passage 40 Second supply passage 42 Third supply passage 44 Stack cooling supply passage 46 Suction port 48 Stack cooling return passage 50 Discharge port 52 Extension passage 54 Outlet passage 56 Curved portion

Claims (5)

  A fuel cell vehicle auxiliary machine mounting structure in which a fuel cell stack is disposed in an engine room in front of a vehicle, and a cooling water pump for cooling the fuel cell stack is disposed in a main floor behind the engine room. A center tunnel that protrudes upward in the front-rear direction of the vehicle is provided in the center tunnel, and the cooling water pump is disposed in the center tunnel so that the longitudinal direction of the cooling water pump coincides with the front-rear direction of the vehicle. A fuel cell vehicle auxiliary equipment mounting structure.   2. The fuel cell vehicle accessory mounting structure according to claim 1, wherein a heat exchanger is disposed in front of the cooling water pump, and the heat exchanger is disposed in the center tunnel.   2. The fuel cell vehicle according to claim 1, wherein a discharge port is provided at a side portion of the cooling water pump, and an extension passage connected to the discharge port of the cooling water pump is formed in a centrifugal direction of the cooling water pump. Auxiliary equipment mounting structure.   The extension passage is extended along the rear surface of the heat exchanger, and an outlet passage is provided that extends to the front through a curved portion while continuing to the extension passage, and the outlet passage is provided on a side surface of the heat exchanger. The auxiliary-equipment mounting structure for a fuel cell vehicle according to claim 3, wherein the auxiliary device mounting structure is disposed along the fuel cell vehicle.   The cooling water pump and the heat exchanger are arranged to be shifted in the width direction, and a return passage that communicates with a suction port provided in a front portion of the cooling water pump is provided on the side of the heat exchanger, 4. The auxiliary equipment mounting structure for a fuel cell vehicle according to claim 3, wherein the inlet and the return passage are arranged in a substantially straight line.

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