JP2011105270A - Vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent adverse effect on other equipment in a vehicle, which is caused by an electromagnetic wave from electric equipment included in a power supply device, which propagates to a metal member disposed in the vicinity of the power supply device, and by the electromagnetic wave having propagated being discharged from the metal member. <P>SOLUTION: The power supply device 110 which includes a DC/DC converter 135 generating the electromagnetic wave is disposed in a luggage compartment 180 backward of a rear seat 150 of the vehicle 100. A metal frame 151 of the rear seat 150 disposed near the power supply device 110 is electrically connected to a body earth 105 of the vehicle 100. As a result, the potential of the metal frame 151 and the body earth 105 become equal, thereby preventing the electromagnetic wave having propagated to the metal frame 151 from being discharged. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a vehicle, and more specifically to a technique for shielding electromagnetic waves emitted from an electric device mounted on a vehicle.

  2. Description of the Related Art In recent years, attention has been paid to a vehicle that is mounted with a power supply device including a power storage device (for example, a secondary battery or a capacitor) and that uses a driving force generated from electric power stored in the power storage device as an environment-friendly vehicle. . Such vehicles include, for example, electric vehicles, hybrid vehicles, fuel cell vehicles, and the like.

This power supply device may include an electric device for controlling the power supply device.
Japanese Patent Laying-Open No. 2008-273279 (Patent Document 1) discloses a power supply device in a vehicle including a power supply device and an electronic device for controlling the power supply device, and an antenna for performing at least one of transmission and reception of a radio signal. Discloses a configuration in which at least a part of is disposed between an antenna and an electronic device.

  According to Japanese Patent Laying-Open No. 2008-273279 (Patent Document 1), at least a part of a power supply device functions as an electromagnetic shielding material for an electronic device with respect to the antenna. The adverse effect on the reception operation can be suppressed.

JP 2008-273279 A

  In the configuration disclosed in Japanese Patent Application Laid-Open No. 2008-273279 (Patent Document 1), noise emitted from the electronic device is directly transmitted to the antenna by disposing the electronic device below the power supply device in the luggage compartment. Is suppressed.

  However, in Japanese Patent Application Laid-Open No. 2008-273279 (Patent Document 1), an electric device that can be a source of noise is arranged in a space for storing a spare tire, but depending on the structure of the vehicle, it may be located below the power supply device. There are cases where it is impossible to place the spare tire or the spare tire cannot be stored.

  In addition, noise from the electric device may propagate to other metal members arranged in the vicinity of the electric device, and the metal member may emit the propagated noise. Then, the noise emitted from the metal member may adversely affect the reception operation of the antenna.

  The present invention has been made to solve such problems, the purpose of which is to propagate electromagnetic waves from the electrical equipment included in the power supply device to a metal member disposed in the vicinity of the power supply device, This is to suppress the adverse effect on other devices caused by the propagation of the propagated electromagnetic wave from the metal member.

  A vehicle according to the present invention includes a power supply device and a metal member disposed in the vicinity of the power supply device. The power supply device includes an electric device used for controlling the power supply device. The metal member is electrically connected to the vehicle body earth so as to suppress electromagnetic waves received from the electric device from being emitted from the metal member.

  Preferably, the vehicle further includes a seat. The metal member is a metal frame included in the seat.

  Preferably, the vehicle further includes an antenna for performing at least one of transmission and reception of a radio signal. And an antenna is arrange | positioned in the position where the electromagnetic waves from an electric equipment are shielded by the backrest part of a seat.

  Preferably, the antenna is arranged at a position where the back portion of the seat is between the antenna and the electric device.

  Preferably, the seat is a rear seat. And a power supply device is arrange | positioned in the luggage compartment behind a rear seat in a vehicle.

  Preferably, the vehicle further includes a conductive bracket and a bolt for connecting the bracket to the metal frame and the body ground.

Preferably, the electrical device includes a device having a switching circuit.
Preferably, the power supply device further includes a power storage device for supplying electric power used to generate a driving force of the vehicle. The electric device includes a DC / DC converter for stepping down the voltage of the power storage device.

  According to the present invention, it is possible to prevent electromagnetic waves from the electrical equipment included in the power supply device from propagating to the metal member disposed in the vicinity of the power supply device, and to release the propagated electromagnetic waves from the metal member. Can adversely affect other devices.

1 is a schematic diagram of a vehicle according to an embodiment of the present invention. 1 is an overall block diagram of a vehicle. It is a figure for demonstrating the influence by the electromagnetic waves from the electric equipment contained in a power supply device. It is a figure for demonstrating the method of the electromagnetic wave reduction by this Embodiment. It is a figure for demonstrating suitable antenna arrangement | positioning.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals and description thereof will not be repeated.

  FIG. 1 is a schematic diagram of a vehicle 100 according to an embodiment of the present invention. The configuration of the vehicle 100 to which the present invention can be applied is not limited as long as the vehicle 100 is driven by an electric motor using electric power of a power storage device mounted on the vehicle. Examples of the vehicle 100 include an electric vehicle, a fuel cell vehicle, and a hybrid vehicle equipped with an engine.

  Referring to FIG. 1, a seat for a passenger to sit is provided in the passenger compartment of vehicle 100. The seat includes a front seat 140 disposed in the front of the vehicle interior and a rear seat 150 disposed in the rear of the vehicle interior. A luggage compartment (so-called trunk) 180 is provided behind the rear seat 150.

  On the floor of the luggage compartment 180, the power supply device 110 is arranged. The power supply device 110 includes a power storage device 120 and an electric device 130.

  The electric device 130 is an electric device to be used for controlling the power supply device 110. For example, although not shown, a system main relay (SMR), a service plug, a battery monitoring unit, a battery cooling fan, A DC / DC converter for generating a power supply voltage to the auxiliary device is included.

  The electric device 130 is disposed on the power storage device 120. Then, it is covered with a metal cover 131.

  In addition, an antenna that receives a radio signal from the outside and transmits a radio signal to the outside is provided on the upper portion of the vehicle 100. As the antenna, for example, various configurations such as a glass antenna 170 on which an antenna is printed on the rear window 160 and the front window 190, and a metal pole-shaped rod antenna 175 disposed on the roof can be used.

FIG. 2 is an overall block diagram of the vehicle 100.
Referring to FIG. 2, vehicle 100 includes a power supply device 110, a PCU (Power Control Unit) 200 that is a drive device, a motor generator 230, a power transmission gear 240, a drive wheel 250, and a control device (ECU ( Electronic Control Unit))) 300.

  Power supply device 110 includes a power storage device 120, a system main relay SMR, and a DC / DC converter 135. The system main relay SMR and the DC / DC converter 135 are examples of the electric device 130 in FIG.

  The power storage device 120 is a rechargeable DC power source, and includes a power storage device such as a secondary battery such as nickel metal hydride or lithium ion or an electric double layer capacitor. Further, DC voltage VB output from power storage device 120 and input / output DC current IB are detected by a voltage sensor and a current sensor (not shown), respectively. Then, the voltage sensor and the current sensor output detected values of detected DC voltage VB and DC current IB to ECU 300. The output voltage of power storage device 120 is, for example, about 200V.

  System main relay SMR is inserted in a path connecting power storage device 120 and power lines PL1, NL1. The system main relay SMR is controlled by a signal SE from the ECU 300, and switches between power supply from the power storage device 120 to the PCU 200 and cutoff.

  DC / DC converter 135 is connected to power lines PL1 and NL1. DC / DC converter 135 includes a switching element (not shown), and further reduces the DC voltage supplied from power storage device 120 or the electric power generated by motor generator 230 converted by PCU 200 to generate positive line PL2 To the auxiliary device 270 and the auxiliary battery 260.

  DC / DC converter 135 is an insulation type converter, and power lines PL1 and NL1 on the high voltage side, and positive electrode line PL2 and ground line NL2 on the low voltage side are insulated by a transformer (not shown). In addition, ground line NL2 is connected to the body ground of vehicle 100.

  Auxiliary battery 260 is typically formed of a lead storage battery. Auxiliary battery 260 is supplied with charging power from DC / DC converter 135 via positive line PL2. Auxiliary battery 260 is connected to the body ground of vehicle 100 in the same manner as DC / DC converter 135. The output voltage of auxiliary battery 260 is lower than the output voltage of power storage device 120, for example, about 12V.

  The auxiliary device 270 includes, for example, lamps, wipers, heaters, audio, a navigation system, and the like. Auxiliary device 270 is supplied with power from DC / DC converter 135 via positive line PL2. Auxiliary device 270 is connected to the body ground of vehicle 100 in the same manner as DC / DC converter 135.

  PCU 200 includes a converter 210, an inverter 220, and capacitors C1 and C2.

  Converter 210 performs power conversion between power lines PL1 and NL1 and power lines HPL and NL1 based on control signal PWC from ECU 300.

  Inverter 220 is connected to power lines HPL and NL1. Inverter 220 drives motor generator 230 based on control signal PWI from ECU 300.

  Capacitor C1 is provided between power lines PL1 and NL1, and reduces voltage fluctuation between power lines PL1 and NL1. Capacitor C2 is provided between power lines HPL and NL1, and reduces voltage fluctuation between power lines HPL and NL1.

  Motor generator 230 is an AC rotating electric machine, for example, a permanent magnet type synchronous motor including a rotor in which permanent magnets are embedded.

  The output torque of motor generator 230 is transmitted to drive wheels 250 via power transmission gear 240 constituted by a speed reducer and a power split mechanism, and causes vehicle 100 to travel. The motor generator 230 can generate power by the rotational force of the drive wheels 250 during the regenerative braking operation of the vehicle 100. Then, the generated power is converted into charging power for power storage device 120 by PCU 200.

  Further, in a hybrid vehicle equipped with an engine (not shown) in addition to motor generator 230, necessary engine driving force is generated by operating this engine and motor generator 230 in a coordinated manner. In this case, it is also possible to charge the power storage device 120 using the power generated by the rotation of the engine.

  Electrical device 130 included in power supply apparatus 110 includes system main relay SMR and DC / DC converter 135 as described above. In these devices, electromagnetic waves are generated when the relay is opened and closed or when the switching element is switched. This electromagnetic wave may be a noise source for an antenna for performing wireless communication. For example, the electromagnetic wave may cause noise such as radio or cause malfunction of a device operating wirelessly. Therefore, it is necessary to reduce the influence of this electromagnetic wave.

  In the power supply device 110, a metal cover 131 is disposed so as to cover the electrical device 130 as shown in FIG. However, since a gap is not formed in the metal cover 131 at a drawing port of a cable (not shown) connected to the electric device 130 or the like, in many cases, the electromagnetic wave generated by the metal cover 131 alone is completely shielded. I can't. In addition, electromagnetic waves may be emitted from the positive line PL2 that is an output cable of the DC / DC converter 135 drawn from the power supply device 110. Although it is possible to individually take countermeasures against leakage of electromagnetic waves for each of these devices, there is a possibility that the cost may be increased.

  FIG. 3 is a diagram for explaining the influence of electromagnetic waves from the electric device 130 included in the power supply device 110.

  Referring to FIG. 3, when glass antenna 170 is provided in rear window 160 as shown in FIG. 1, if power supply device 110 is arranged in luggage compartment 180, it is emitted from electric device 130. The electromagnetic wave can reach the glass antenna 170 directly.

  Further, if there is a metal member such as a metal frame 151 included in the backrest portion of the rear seat 150 in the vicinity of the power supply device 110, the electromagnetic wave emitted from the electric device 130 propagates to the metal member by electromagnetic induction. When this metal member is not connected to body earth 105 of vehicle 100, the metal member has a stray capacitance with respect to body earth 105, and therefore, a potential difference is produced with body earth 105. As a result, the metal member itself becomes an antenna, and the propagated electromagnetic wave can be further emitted to the outside. In this case, in FIG. 3, not only the influence on the glass antenna 170 is further increased, but also on other antennas and electronic devices that are disposed at positions where electromagnetic waves emitted from the electric device 130 do not reach directly. May be affected by electromagnetic waves.

  In particular, in order to secure a space for the luggage compartment 180 of the vehicle 100, the position of the power supply device 110 is arranged as far forward as possible (that is, a position close to the rear seat 150), and the horizontal length and width of the power supply device 110 are as well. May be required to be small. Then, it may be necessary to dispose the electric device 130 on the upper part of the power storage device 120, and the influence of electromagnetic waves propagating to a metal member such as the metal frame 151 may be further increased.

  Therefore, in the present embodiment, in a vehicle having a configuration in which power supply device 110 is arranged in luggage compartment 180, a metal member arranged in the vicinity of power supply device 110 is connected to a ground wire on the low-voltage side of electric device 130. By electrically connecting to the body earth 105 of the vehicle 100 that is being used, the influence of electromagnetic waves from the electric device 130 that has propagated to the metal member is reduced.

  FIG. 4 is a diagram showing a countermeasure example when the propagated electromagnetic wave from the electric device 130 is emitted from the metal frame 151 of the rear sheet 150 as a metal member as shown in FIG. The metal member is not limited to the metal frame 151 of the rear seat 150, and the same effect can be obtained as long as it is a conductive substance that is disposed in the vicinity of the power supply device 110 and is not connected to the body ground.

  In FIG. 4, the metal frame 151 of the rear seat 150 is connected to the body ground 105 by bolts 153 and 154 using a conductive bracket 152. By doing so, the metal frame 151 has the same potential with respect to the body ground 105 to which the ground wire on the low voltage side of the electrical device 130 is connected, and the stray capacitance with respect to the body ground 105 can be made substantially zero. As a result, electromagnetic waves propagated to the metal frame 151 can be suppressed from being emitted from the metal frame 151. The connection to the body ground 105 may be any conductive member, and may be connected using, for example, a cable instead of the bracket 152.

  Further, as shown in FIG. 5, instead of the glass antenna 170 provided in the rear window 160, a glass antenna 170A is provided in the front window 190, and the backrest portion of the rear seat 150 includes the electric device 130 and the glass antenna 170A. Place it at a position between. By doing in this way, the metal frame 151 in the rear seat 150 acts as an electromagnetic shield, and it is possible to prevent electromagnetic waves from the electric device 130 from reaching the antenna directly.

  Note that although the glass antenna 170A is described as an example in FIG. 5, the antenna structure is not particularly limited as long as the antenna can be disposed so that the rear sheet 150 is positioned between the antenna and the electric device 130. For example, a rod antenna 175 as shown in FIG. 1 may be provided on the roof, or a loop antenna may be used instead of the rod antenna.

  As described above, in the vehicle 100 in which the power supply device 110 is disposed in the luggage compartment 180 behind the rear seat 150, the metal member disposed in the vicinity of the power supply device 110 such as the metal frame 151 in the backrest portion of the rear seat 150. Is electrically connected to the body ground 105 of the vehicle 100 to which the ground wire on the low voltage side of the electric device 130 is connected. By doing in this way, the electromagnetic waves emitted from the electric device 130 included in the power supply device 110 propagate to these metal members, and the propagated electromagnetic waves are emitted from the metal members to other devices such as an antenna. An adverse effect can be suppressed.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and is intended to include meanings equivalent to the scope of claims for patent and all modifications within the scope.

  DESCRIPTION OF SYMBOLS 100 Vehicle, 105 Body earth, 110 Power supply device, 120 Power storage device, 130 Electric equipment, 135 DC / DC converter, 140 Front seat, 150 Rear seat, 151 Metal frame, 152 Bracket, 153,154 bolt, 160 Rear window, 170, 170A glass antenna, 175 rod antenna, 180 luggage compartment, 190 front window, 200 PCU, 210 converter, 220 inverter, 230 motor generator, 240 power transmission gear, 250 driving wheel, 260 auxiliary battery, 270 auxiliary device, 300 ECU , C1, C2 capacitor, HPL, NL1, PL1 power line, NL2 ground line, PL2 positive line, SMR system main relay.

Claims (8)

A vehicle,
A power supply device and a metal member disposed in the vicinity of the power supply device,
The power supply device
Including electrical equipment used to control the power supply,
The vehicle, wherein the metal member is electrically connected to a body ground of the vehicle so as to suppress electromagnetic waves received from the electric device from being emitted from the metal member. A seat,
The vehicle according to claim 1, wherein the metal member is a metal frame included in the seat. An antenna for transmitting and / or receiving radio signals;
The vehicle according to claim 2, wherein the antenna is disposed at a position where an electromagnetic wave from the electric device is shielded by a backrest portion of the seat.   The vehicle according to claim 3, wherein the antenna is disposed at a position where the backrest portion of the seat is between the antenna and the electric device. The seat is a rear seat;
The vehicle according to claim 2, wherein the power supply device is arranged in a luggage compartment behind the rear seat in the vehicle. A conductive bracket;
The vehicle according to claim 2, further comprising a bolt for connecting the bracket to the metal frame and the body ground.   The vehicle according to claim 1, wherein the electrical device includes a device having a switching circuit. The power supply device
A power storage device for supplying electric power used to generate the driving force of the vehicle;
The electrical equipment is
The vehicle according to claim 7, comprising a DC / DC converter for stepping down a voltage of the power storage device.

Images