IN-CAR INFORMATION DISPLAY SYSTEM AND POWER SUPPLY METHOD

• US 20150045996A1
• Filed: 02/28/2012
• Published: 02/12/2015
• Est. Priority Date: 02/28/2012
• Status: Active Grant

• Current Assignee: Mitsubishi Electric Corporation
• Original Assignee: Mitsubishi Electric Corporation
• Inventors: Oki, Masao, Ohashi, Satoru, Sawazaki, Hideo
• Granted Patent: US 9,511,784 B2
• Time in Patent Office: Days
• US Class Current: 701/19
• CPC Class Codes: B60L 1/003 to auxiliary motors, e.g. for pumps, compressors
• CPC Class Codes: B60L 2200/26 Rail vehicles
• CPC Class Codes: B60L 2210/10 DC to DC converters
• CPC Class Codes: B60L 2210/20 AC to AC converters
• CPC Class Codes: B60L 2240/80 Time limits
• CPC Class Codes: B60L 2250/16 by display
• CPC Class Codes: B60L 3/003 relating to inverters
• CPC Class Codes: B60L 3/12 Recording operating variables ; Monitoring of operating variables
• CPC Class Codes: B60L 50/52 characterised by DC-motors
• CPC Class Codes: B60L 58/12 responding to state of charge [SoC]
• CPC Class Codes: B60L 7/12 for vehicles propelled by dc motors
• CPC Class Codes: B60L 9/04 fed from dc supply lines
• CPC Class Codes: B61L 15/0036 Conductor-based, e.g. using CAN-Bus, train-line or optical fibres
• CPC Class Codes: B61L 15/0072 On-board train data handling
• CPC Class Codes: B61L 15/0081 On-board diagnosis or maintenance
• CPC Class Codes: B61L 15/009 On-board display devices
• CPC Class Codes: B61L 25/00 Recording or indicating positions or identities of vehicles or trains or setting of track apparatus
• CPC Class Codes: Y02T 10/70 Energy storage systems for electromobility, e.g. batteries
• CPC Class Codes: Y02T 10/72 Electric energy management in electromobility

Abstract

An in-car information display system includes a power storage device including a storage battery charged with direct-current power obtained by converting electric power from an overhead wire, a plurality of display devices that operate by receiving supply of direct-current power from the power storage device and provide a guidance display related to a service of a train to passengers, and a terminal device that operates by receiving the supply of the direct-current power from the power storage device and delivers to the display devices information for guidance display that is information used for the guidance display. The power storage device switches a power supply operation to the display devices according to a residual capacity of the storage battery and reduces a total amount of electric power supplied to each of the display devices.

Claims

1. An in-car information display system comprising:

a power storage device including a storage battery charged with direct-current power obtained by converting electric power from an overhead wire;

a plurality of display devices that operate by receiving supply of direct-current power from the power storage device and provide a guidance display related to a service of a train to passengers; and

a terminal device that operates by receiving the supply of the direct-current power from the power storage device and delivers to the display devices information for guidance display that is information used for the guidance display,

wherein the power storage device switches a power supply operation to the display devices according to a residual capacity of the storage battery and reduces a total amount of electric power supplied to each of the display devices.

2. The in-car information display system according to claim 1, wherein, when the residual capacity is equal to or smaller than a predetermined threshold, the power storage device stops power supply to a part of the display devices.

3. The in-car information display system according to claim 1, wherein the power storage device selects and uses a plurality of thresholds in decreasing order, and, when the residual capacity is equal to or smaller than the selected threshold, stops power supply to a part of the display devices among the display devices to which the electric power is supplied up to that point and changes the threshold in use.

4. The in-car information display system according to claim 3,

wherein each of the display devices includes priority determined on the basis of a setting position thereof, and

wherein, every time the residual capacity is equal to or smaller than the selected threshold, the power storage device stops the power supply in ascending order of priority.

5. The in-car information display system according to claim 1, wherein, when the residual capacity is equal to or smaller than a predetermined threshold, the power storage device starts a power supply operation for switching, at a fixed cycle, the display device set as a power supply destination.

6. The in-car information display system according to claim 1, wherein, when the residual capacity is equal to or smaller than a predetermined threshold, the power storage device instructs each display device to reduce luminance of backlights.

7. The in-car information display system according to claim 1, wherein the power storage device selects and uses a plurality of thresholds in decreasing order, and instructs, when the residual capacity is equal to or smaller than the selected threshold, each display device to reduce luminance of backlights and change the threshold in use.

8. The in-car information display system according to claim 1, wherein the power storage device selects and uses a plurality of thresholds in decreasing order, instructs, when the residual capacity is equal to or smaller than the selected threshold, each display device to reduce luminance of backlights and change the threshold in use, and stops, when detecting that the residual capacity is equal to or smaller than the selected threshold after the luminance of the backlights is reduced to a lowest value, power supply to a part of the display devices among the display devices to which the electric power is supplied up to that point and changes the threshold in use.

9. The in-car information display system according to claim 1, wherein the residual capacity is an estimated residual capacity estimated on the basis of an output voltage of the storage battery.

10. The in-car information display system according to claim 1, wherein the residual capacity is an estimated residual capacity estimated on the basis of an elapsed time from a stop of supply of the direct-current power obtained by converting the electric power from the overhead wire.

11. A power supply method for a car including a power storage device having a storage battery charged with direct-current power obtained by converting electric power from an overhead wire, a plurality of display devices that operate by receiving supply of direct-current power from the power storage device and provide a guidance display related to a service of a train to passengers, and a terminal device that operates by receiving the supply of the direct-current power from the power storage device and delivers to the display devices information for guidance display that is information used for the guidance display, the power supply method comprising:

switching a power supply operation to the display devices by the power storage device according to a residual capacity of the storage battery; and

reducing a total amount of electric power supplied to each display device.

12. The power supply method according to claim 11, wherein, when the residual capacity is equal to or smaller than a predetermined threshold, the power storage device stops power supply to a part of the display devices.

13. The power supply method according to claim 11, wherein the power storage device selects and uses a plurality of thresholds in decreasing order, and, when the residual capacity is equal to or smaller than the selected threshold, stops power supply to a part of the display devices among the display devices to which the electric power is supplied up to that point and changes the threshold in use.

14. The power supply method according to claim 13,

wherein each of the display devices includes priority determined on the basis of a setting position thereof, and

wherein, every time the residual capacity is equal to or smaller than the selected threshold, the power storage device stops the power supply in ascending order of priority.

15. The power supply method according to claim 11, wherein, when the residual capacity is equal to or smaller than a predetermined threshold, the power storage device starts a power supply operation for switching, at a fixed cycle, the display device set as a power supply destination.

16. The power supply method according to claim 11, wherein, when the residual capacity is equal to or smaller than a predetermined threshold, the power storage device instructs each display device to reduce luminance of backlights.

17. The power supply method according to claim 11, wherein the power storage device selects and uses a plurality of thresholds in decreasing order, and instructs, when the residual capacity is equal to or smaller than the selected threshold, each display device to reduce luminance of backlights and change the threshold in use.

18. The power supply method according to claim 11, wherein the power storage device selects and uses a plurality of thresholds in decreasing order, instructs, when the residual capacity is equal to or smaller than the selected threshold, each display device to reduce luminance of backlights and change the threshold in use, and stops, when detecting that the residual capacity is equal to or smaller than the selected threshold after the luminance of the backlights is reduced to a lowest value, power supply to a part of the display devices among the display devices to which the electric power is supplied up to that point and changes the threshold in use.

19. The power supply method according to claim 11, wherein the residual capacity is an estimated residual capacity estimated on the basis of an output voltage of the storage battery.

20. The power supply method according to claim 11, wherein the residual capacity is an estimated residual capacity estimated on the basis of an elapsed time from a stop of supply of the direct-current power obtained by converting the electric power from the overhead wire.