Maintenance of a minimum voltage to equipment in rail vehicle

• US 9,796,347 B2
• Filed: 01/06/2014
• Issued: 10/24/2017
• Est. Priority Date: 01/06/2014
• Status: Active Grant

• Current Assignee: Union Pacific Railroad Company (Union Pacific Corporation)
• Original Assignee: Union Pacific Railroad Company (Union Pacific Corporation)
• Inventors: Packwood, Steve A
• Primary Examiner(s): Barnie, Rexford
• Assistant Examiner(s): Mourad, Rasem
• Application Number:
  US14/148,519
• Publication Number:
  US 20150191134A1
• Time in Patent Office: 1,387 Days
• CPC Class Codes: B60L 2240/80 Time limits
• CPC Class Codes: B60R 16/03 for supply of electrical power to vehicle subsystems or for circuit arrangements for charging batteries H02J7/00

Abstract

Herein described is at least a system for generating one or more control signals based on a voltage provided by an energy storage device. Based on the one or more control signals, the system may selectively enable flow of current through one of: a) a first circuitry when the voltage is equal to or greater than a threshold value, and b) a second circuitry when the voltage is less than the threshold value, wherein the flow of the current through the second circuitry upconverts the voltage associated with the current from a first value to a second value.

Claims

1. A system comprising:

a rail vehicle comprising;

a first circuitry configured for generating one or more control signals based on a voltage provided by an energy storage device;

a second circuitry configured for;

receiving said one or more control signals; and

first providing current sourced by said energy storage device through said second circuitry to power one or more devices, said first providing performed when said one or more control signals enables said second circuitry;

a third circuitry configured for;

receiving said one or more control signals;

upconverting said voltage from a first value to a second value, and

second providing said current through said third circuitry to power said one or more devices, said upconverting and said second providing performed when said one or more control signals enables said third circuitry; and

a timer for measuring a duration of said upconverting,

wherein said one or more control signals are configured to selectively enable said second circuitry when said voltage is equal to or greater than a threshold value, and said third circuitry when said voltage is less than said threshold value, and

wherein said rail vehicle is configured to;

count a number of occurrences in which said voltage has dropped below said threshold value and said third circuitry has been enabled, compute a ratio of said number of occurrences to a number of cranking events, determine whether said ratio exceeds a certain percentage, and generate an alert that said energy storage device should be evaluated when said ratio exceeds said certain percentage.

2. The system of claim 1 wherein said rail vehicle comprises a locomotive.

3. The system of claim 1 wherein said second value equals said threshold value.

4. The system of claim 1 wherein said upconverting is performed for a period of time.

5. The system of claim 4 wherein said period of time corresponds to an estimated maximum duration of a cranking operation of said rail vehicle.

6. The system of claim 4 wherein an alert is generated at the end of said period of time.

7. The system of claim 1 wherein said second circuitry comprises one or more metal oxide field effect transistors (MOSFETs).

8. The system of claim 1 further comprising a fourth circuitry for monitoring a voltage difference across said second circuitry.

9. The system of claim 8 wherein an alert is generated when said voltage difference across said second circuitry falls outside a normal range of acceptable values.

10. The system of claim 1 wherein said energy storage device comprises a battery.

21. The system of claim 1 wherein said upconverting is performed for a period of time based on an expected maximum amount of time said third circuitry can convert said voltage provided by said energy storage device to said second value.

22. The system of claim 1 wherein said upconverting is performed for a period of time based on a difference between said second value and said first value.

23. The system of claim 1 wherein said upconverting is performed for a period of time based on a maximum energy allowed to be dissipated by said third circuitry while said third circuitry is enabled.

24. The system of claim 23 wherein said third circuitry is disabled when said period of time is reached.

26. The system of claim 1 wherein said third circuitry comprises:

a plurality of voltage converter stages, wherein each of said plurality of voltage converter stages is synchronized to a corresponding clock of a plurality of clocks, and wherein each of said plurality of clocks is phase shifted relative to each other.

11. A method comprising:

generating one or more control signals by a first circuitry based on a voltage provided by an energy storage device of a rail vehicle;

first receiving a first subset of said one or more control signals by a second circuitry;

second receiving a second subset of said one or more control signals by a third circuitry;

using said one or more control signals to selectively enable said second circuitry when said voltage is equal to or greater than a threshold value, and said third circuitry when said voltage is less than said threshold value;

generating a low resistance conduction path across said second circuitry and a high resistance path across said third circuitry and passing current from said energy storage device to one or more devices through said second circuitry when said second circuitry is enabled and said third circuitry is disabled;

generating a low resistance conduction path across said third circuitry and a high resistance path across said second circuitry, upconverting said voltage from a first value to a second value, and passing current from said energy storage device to said one or more devices through said third circuitry when said third circuitry is enabled and said second circuitry is disabled;

measuring a duration of said upconverting;

counting a number of occurrences in which said voltage is less than said threshold value and said third circuitry has been enabled;

computing a ratio of said number of occurrences to a number of cranking events;

determining whether said ratio exceeds a certain percentage; and

generating an alert that said energy storage device should be evaluated when said ratio exceeds said certain percentage, wherein said rail vehicle comprises said first, second, and third circuitries.

12. The method of claim 11 wherein said rail vehicle comprises a locomotive.

13. The method of claim 11 wherein said second value equals said threshold value.

14. The method of claim 11 wherein said upconverting is performed for a period of time.

15. The method of claim 14 wherein said period of time corresponds to an estimated maximum duration of a cranking operation of said rail vehicle.

16. The method of claim 14 wherein an alert is generated at the end of said period of time.

17. The method of claim 11 wherein said second circuitry comprises one or more metal oxide field effect transistors (MOSFETs).

18. The method of claim 11 further comprising monitoring a voltage difference across said second circuitry by way of a fourth circuitry.

19. The method of claim 18 further comprising generating an alert when said voltage difference across said second circuitry falls outside a normal range of acceptable values.

25. The method of claim 17 wherein said low resistance conduction path of said second circuitry is generated by turning on each of said one or more MOSFETs by way of exceeding a turn-on voltage of each of the gate to source voltages of said one or more MOSFETs.

20. A system comprising:

a rail vehicle comprising;

two or more circuitries operable for, at least;

generating one or more control signals based on a voltage provided by an energy storage device;

based on said one or more control signals, selectively enabling a flow of current through a first circuitry of said two or more circuitries when said voltage is equal to or greater than a threshold value, and a second circuitry of said two or more circuitries when said voltage is less than said threshold value, wherein said flow of said current through said second circuitry upconverts said voltage from a first value to a second value, said voltage associated with said current;

measuring a duration of time in which said second circuitry upconverts said voltage;

counting a number of occurrences in which said voltage is less than said threshold value and said second circuitry has been enabled;

computing a ratio of said number of occurrences to a number of cranking events;

determining whether said ratio exceeds a certain percentage; and

generating an alert that said energy storage device should be evaluated when said ratio exceeds said certain percentage.