JP2016068795A - Power supply device for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power supply device for an automobile which can safely perform the exchange work of a battery while supplying power to a load group.SOLUTION: A power supply device for an automobile comprises: a first switch 16 interposed between a first battery 12 and a load group 20; a second switch 18 interposed between a second battery 14 and the load group 20; a hood switch 22 which detects the release of a hood of an engine room 11, and outputs a detection signal dt1; a luggage switch 23 which detects the release of a hood of a luggage room 13, and outputs a detection signal dt2; and a power supply control part 21 which brings the first switch into a non-conductive state on the basis of the detection signal of the hood switch, and brings the second switch into a non-conductive state on the basis of the detection signal of the luggage switch.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an automotive power supply apparatus that can supply power from a plurality of storage batteries to a large number of loads in order to ensure redundancy of the power supply.

  FIG. 3 shows an example of an automotive power supply device that can supply power to a load group from two batteries. The load group 1 is connected to positive terminals of the first and second batteries 2 and 3, and is supplied with power from at least one of the first and second batteries 2 and 3.

  With such a configuration, even when one of the first and second batteries 2 and 3 fails, power is supplied to the load group 1 from the other battery that has not failed. Redundancy is ensured.

  In the automobile power supply device as described above, for example, when the second battery 3 is lost and needs to be replaced, the connection plugs 6 and 7 are removed from the connection terminals 4 and 5 of the second battery 3 and the loss is lost. Replace the fallen battery with a new battery.

  Even during such replacement work, power is continuously supplied from the first battery 2 to the load group 1, so that the load group 1 can operate normally.

JP 2009-12728 A

  During the replacement operation as described above, since the power is still supplied to the connection plug 6 from the first battery 2, if the connection plug 6 is accidentally brought into contact with the connection plug 7 or the vehicle body, the contact portion 6 Sparks may be generated due to a ground fault, or the power supply wiring 8 may be burned out.

  Patent Document 1 discloses a configuration in which power supply from a capacitor is interrupted when the battery is overdischarged in a power supply device including the battery and the capacitor. However, a configuration for preventing the occurrence of a spark due to the occurrence of a ground fault while supplying power to the load group during the replacement operation of one battery is not disclosed.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide an automotive power supply device that can safely perform battery replacement work while supplying power to a load group.

  An automotive power supply that solves the above problems includes a first battery installed in an engine room, a second battery installed in a luggage room, and a load supplied with power from the first and second batteries. A first switch interposed between the first battery and the load group, and a second switch interposed between the second battery and the load group. Two switches, a hood switch that detects the opening of the hood in the engine room and outputs a detection signal, a luggage switch that detects the opening of the hood in the luggage room and outputs a detection signal, and the detection signal of the hood switch Based on the detection signal of the luggage switch, the second switch is turned off. Characterized by comprising a source controller.

With this configuration, when the hood of the engine room or the luggage room is opened, the connection between the first battery and the second battery is cut off.
In the above-described automobile power supply device, it is preferable that power is supplied from the first and second batteries to the power supply control unit via the first switch and the second switch.

  With this configuration, even if either the first switch or the second switch is in a non-conducting state, power is supplied from either the first battery or the second battery to the power supply control unit.

In the above-described automobile power supply device, it is preferable that the first switch is provided in a power supply box provided in the engine room.
With this configuration, the first battery is disconnected from the second battery by the power supply box located in the vicinity thereof.

In the above-described automobile power supply device, it is preferable that the second switch is provided in a power supply box disposed in the luggage room.
With this configuration, the second battery is disconnected from the first battery by the power supply box located in the vicinity thereof.

  Further, in the above-described automobile power supply device, it is preferable that the first switch and the second switch are configured by relays that make the contacts non-conductive based on a control signal output from the power supply control unit.

  With this configuration, the contact point of the relay is controlled to be in a non-conductive state by the power supply control unit, and the connection between the first battery and the second battery is interrupted.

  According to the automobile power supply device of the present invention, it is possible to safely perform battery replacement work while supplying power to the load group.

It is a schematic diagram showing a power supply device for vehicles of one embodiment. It is a flowchart which shows operation | movement of the power supply device for motor vehicles. It is a schematic diagram which shows a prior art example.

  Hereinafter, an embodiment of an automobile power supply device will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, a first battery 12 of a lead storage battery is installed in an engine room 11 at the front of the vehicle, and a second battery 14 made of a capacitor is installed in a luggage room 13 at the rear of the vehicle. Has been.

  In the engine room 11, a power supply box 15 is installed in the vicinity of the first battery 12, and a first relay 16 and a fuse (not shown) are arranged in the power supply box 15.

  In the luggage room 13, a power supply box 17 is installed in the vicinity of the second battery 14, and a second relay 18 and a fuse (not shown) are arranged in the power supply box 17. The first and second batteries 12 and 14 are connected via the power supply wiring 19 and the contacts of the first and second relays 16 and 18.

  Between the first and second relays 16 and 18, a load group 20 and a power monitoring ECU 21 are connected to the power supply wiring 19. And when the contact of the 1st and 2nd relays 16 and 18 is a conduction | electrical_connection state, electric power is supplied from the 1st and 2nd batteries 12 and 14 to the load group 20 and power supply monitoring ECU21.

  The engine room 11 is provided with a hood switch 22 that detects opening of the hood in the engine room 11, and a detection signal dt 1 of the hood switch 22 is output to the power supply monitoring ECU 21.

  The luggage room 13 is provided with a luggage switch 23 for detecting the opening of the hood, and a detection signal dt2 of the luggage switch 23 is output to the power supply monitoring ECU 21.

  The power supply monitoring ECU 21 can output an excitation signal to the excitation coils of the first and second relays 16 and 18. When the detection signal dt1 is received from the hood switch 22, an excitation signal is output to the first relay 16 so that the contact point of the first relay 16 is turned off.

  Further, when the power monitoring ECU 21 receives the detection signal dt2 from the luggage switch 23, the power monitoring ECU 21 outputs an excitation signal to the second relay 18 so that the contact of the second relay 18 is in a non-conductive state.

Next, the operation of the automobile power supply device configured as described above will be described.
When the hoods of the engine room 11 and the luggage room 13 are normally closed, the detection signals dt1 and dt2 from the hood switch 22 and the luggage switch 23 are not output to the power monitoring ECU 21.

  In this state, the contacts of the first and second relays 16 and 18 are held in a conductive state, and power is supplied from at least one of the first and second batteries 12 and 14 to the load group 20 and the power supply monitoring ECU 21. Is done.

  In such a normal time, as shown in FIG. 2, the power supply monitoring ECU 21 determines whether or not detection signals dt1 and dt2 based on the start of the battery replacement work, that is, the opening of the hood of the engine room 11 or the luggage room 13 are input. It is determined (step 1).

Here, when it is necessary to replace the first battery 12 and the hood of the engine room 11 is opened, the detection signal dt1 is output from the hood switch 22 to the power supply monitoring ECU 21.
Then, the power supply monitoring ECU 21 detects a battery replacement operation (step 2), and brings the contact of the first relay 16 near the first battery 12 into a non-conductive state (step 3). Then, the hood of the engine room 11 is closed, and a state of waiting for the reception stop of the detection signal dt1 is entered (step 4).

  In this state, the connection between the first battery 12 and the second battery 14 is cut off. Therefore, when the first battery 12 is replaced, a spark is generated even if the plug connected to the positive terminal of the first battery 12 contacts the vehicle body or the plug connected to the negative terminal. Or a ground fault current does not flow.

  When the replacement work of the first battery 12 is finished and the hood of the engine room 11 is closed, the power monitoring ECU 21 detects the stop of reception of the detection signal dt1 (step 5). Then, the contact of the first relay 16 is returned to the conductive state (step 6), and the battery replacement operation is terminated.

  When it becomes necessary to replace the second battery 14, the detection signal dt 2 is output from the luggage switch 23 to the power supply monitoring ECU 21 based on the opening of the hood of the luggage room 13.

  Then, the contact of the second relay 18 is turned off by the power monitoring ECU 21, and the connection between the first battery 12 and the second battery 14 is cut off (steps 1 to 3). Then, safe replacement work of the second battery 14 becomes possible.

  When the replacement of the second battery 14 is completed, the hood of the luggage room 13 is closed, and the reception of the detection signal dt2 is stopped, the contact of the second relay 18 returns to the conductive state (step 4). ~ 6).

The following effects can be obtained with the automobile power supply device as described above.
(1) When the first battery 12 is replaced, the connection between the first battery 12 and the second battery 14 can be cut off. Therefore, the replacement work of the first battery 12 can be performed safely.
(2) When the second battery 14 is replaced, the connection between the first battery 12 and the second battery 14 can be cut off. Therefore, the replacement work of the second battery 14 can be performed safely.
(3) When replacing the first battery 12, power can be supplied from the second battery 14 to the load group 20 and the power supply monitoring ECU 21, so that the load group 20 and the power supply monitoring ECU 21 can be normally operated. .
(4) Since power can be supplied from the first battery 12 to the load group 20 and the power supply monitoring ECU 21 when the second battery 14 is replaced, the load group 20 and the power supply monitoring ECU 21 can be normally operated. .
(5) The start of the replacement work of the first battery 12 can be easily recognized by the hood switch 22 that detects the opening of the hood in the engine room 11.
(6) The start of the replacement work of the second battery 14 can be easily recognized by the luggage switch 23 that detects the opening of the hood in the luggage room 13.

In addition, you may change the said embodiment as follows.
In the above embodiment, when both the hoods of the engine room 11 and the luggage room 13 are opened, the relay is not opened by the hood opened later. In this way, the supply of electric power to the load group 20 and the power supply monitoring ECU 21 is not interrupted.
The first and second batteries 12 and 14 may be either lead acid batteries or capacitors.

  DESCRIPTION OF SYMBOLS 11 ... Engine room, 12 ... First battery, 13 ... Luggage room, 14 ... Second battery, 15, 17 ... Power supply box, 16 ... First switch (first relay), 18 ... Second switch (Second relay), 20 ... load group, 21 ... power supply control unit (power supply monitoring ECU), 22 ... hood switch, 23 ... luggage switch.

Claims (5)

A first battery installed in the engine room;
A second battery installed in the luggage room;
In a vehicle power supply device comprising a load group to which power is supplied from the first and second batteries,
A first switch interposed between the first battery and the load group;
A second switch interposed between the second battery and the load group;
A hood switch that detects the opening of the hood in the engine room and outputs a detection signal;
A luggage switch that detects the opening of the hood in the luggage room and outputs a detection signal;
A power control unit configured to turn off the first switch based on the detection signal of the hood switch and to turn off the second switch based on the detection signal of the luggage switch. An automobile power supply device characterized by the above. The automobile power supply device according to claim 1,
A power supply apparatus for an automobile, wherein power is supplied from the first and second batteries to the power supply control section via the first switch and the second switch. The automobile power supply device according to claim 2,
A power supply device for an automobile, wherein the first switch is provided in a power supply box disposed in the engine room. The automobile power supply device according to claim 2,
A power supply device for an automobile, wherein the second switch is provided in a power supply box disposed in the luggage room. The automobile power supply device according to claim 1,
A power supply apparatus for an automobile, wherein the first switch and the second switch are configured by a relay that makes a contact point nonconductive based on a control signal output from the power supply control unit.