System and method for communicating critical and noncritical data in a consist

• US 8,700,237 B1
• Filed: 12/11/2012
• Issued: 04/15/2014
• Est. Priority Date: 12/11/2012
• Status: Active Grant

• Current Assignee: Progress Rail Locomotive Inc. (Caterpillar Incorporated)
• Original Assignee: Electro-Motive Diesel
• Inventors: Otsubo, Tom, Przybylski, Lawrence Stanley
• Primary Examiner(s): Black, Thomas
• Assistant Examiner(s): PAIGE, TYLER D
• Application Number:
  US13/711,196
• Time in Patent Office: 490 Days
• Field of Search: 701/1, 701/19, 701/20, 246/186, 246/187.R, 455/11.1
• US Class Current: 701/19
• CPC Class Codes: B61C 17/12 Control gear; Arrangements for controlling locomotives from remote points in the train or when operating in multiple units control from points outside the train B61L3/00; fluid-actuated telemotors, servomotors F15B; control devices in general G05
• 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: H04B 3/36 Repeater circuits H04B3/58 takes precedence

Abstract

A system is disclosed for communicating a dataset in a consist, the dataset having a critical data portion. The system includes a first transceiver configured to communicate a first data signal indicative of at least the critical data portion of the dataset over a first communication line, and a second transceiver configured to communicate a second data signal indicative of at least the critical data portion of the dataset over a second communication line. The system includes a processor configured to receive the first data signal and the second data signal, to compare the first data signal with the second data signal to determine whether the first data signal or the second data signal includes a more accurate signal, and to determine at least the critical data portion of the dataset based upon the more accurate signal. The critical data portion is associated with the operability of the consist.

Claims

1. A system for communicating a dataset in a consist, the dataset having a critical data portion, the system comprising:

at least a first and a second communication line;

a first transceiver configured to communicate a first data signal indicative of at least the critical data portion of the dataset over the first communication line;

a second transceiver configured to communicate a second data signal indicative of at least the critical data portion of the dataset over the second communication line; and

a processor configured to;

receive the first data signal and the second data signal;

compare the first data signal with the second data signal to determine whether the first data signal or the second data signal includes a more accurate signal; and

determine at least the critical data portion of the dataset based upon the more accurate signal,

wherein the critical data portion is associated with the operability of the consist.

2. The system of claim 1, wherein at least one of the first transceiver and the second transceiver is further configured to communicate a third data signal indicative of a noncritical data portion of the dataset over at least one of the first communication line and the second communication line, wherein the third data signal has a lower priority than the first data signal and the second data signal.

3. The system of claim 1, wherein at least one of the first signal and the second signal is further indicative of the noncritical data portion.

4. The system of claim 1, wherein the processor is further configured to:

detect a first signal strength of the first data signal and a second signal strength of the second data signal;

compare the first and second signal strengths to determine which of the first data signal and the second data signal has a greater signal strength; and

identify the more accurate signal as the first data signal or second data signal having the greater signal strength.

5. The system of claim 1, wherein the critical data portion includes at least one of a signal indicative of speed and a signal indicative of brake pressure associated with the consist.

6. The system of claim 1, further including:

a plurality of heartbeat lines, each heartbeat line configured to transmit a heartbeat signal from one of the first and second transceivers, wherein the processor is further configured to detect the heartbeat signal from at least one of the first and second transceivers and determine whether the at least one of the first and second transceivers is functioning properly and when the first transceiver is not functioning properly, direct transmission of the critical and noncritical data portions to the second transceiver.

7. The system of claim 6, wherein the processor is further configured to:

identify a first quality-of-service metric for the critical data portion and a second quality-of-service metric for the noncritical data portion; and

direct transmission of both the critical data portion and the noncritical data portion over the second communication line using a link aggregation protocol while maintaining at least one of the first quality-of-service metric and the second quality-of-service metric.

8. A computer-implemented method of communicating a dataset in a consist, the dataset having a critical data portion, the method comprising:

receiving via a processor a first data signal and a second data signal, wherein the first data signal and the second data signal are indicative of at least the critical data portion of the dataset;

comparing via the processor the first data signal with the second data signal to determine whether the first data signal or the second data signal includes a more accurate signal;

determining via the processor at least the critical data portion of the dataset based upon the more accurate signal;

detecting via the processor a heartbeat signal indicative of whether a first transceiver associated with the first data signal is functioning properly; and

when the first transceiver is not functioning properly, directing via the processor transmission to the first transceiver to cease,

wherein the critical data portion is associated with the operability of the consist.

9. The method of claim 8, further including receiving a third data signal indicative of a noncritical data portion of the dataset, wherein the third data signal has a lower priority than at least one of the first and second data signals.

10. The method of claim 9, further including:

identifying a first quality-of-service metric for the critical data portion and a second quality-of-service metric for the noncritical data portion; and

directing transmission of both the critical and noncritical data portions using a link aggregation protocol while maintaining at least one of the first quality of service metric and the second quality-of-service metric.

11. The method of claim 10, further including:

determining that a connectivity condition has dropped below a minimum requirement; and

directing transmission of the noncritical data portion to cease.

12. The method of claim 11, wherein the connectivity condition includes at least one of service response time, loss, signal-to-noise ratio, bit rate, delay, jitter, packet dropping probability;

and bit error rate.

13. The method of claim 8, wherein the critical data portion includes at least one of a signal indicative of speed and a signal indicative of brake pressure associated with the consist.

14. A consist comprising:

a plurality of railcars;

at least one brake sensor associated with at least one of the plurality of railcars and configured to provide signals indicative of brake pressure associated with the consist;

at least one speed sensor associated with at least one of the plurality of railcars and configured to provide signals indicative of speed associated with the consist; and

a system for communicating a dataset in the consist, the dataset having a critical data portion, the system comprising;

at least a first and a second communication line;

a first transceiver configured to communicate a first data signal indicative of at least the critical data portion of the dataset over the first communication line;

a second transceiver configured to communicate a second data signal indicative of at least the critical data portion of the dataset over the second communication line; and

a processor configured to;

receive the first data signal and the second data signal;

compare the first data signal with the second data signal to determine whether the first data signal or the second data signal includes a more accurate signal; and

determine at least the critical data portion of the dataset based upon the more accurate signal,

wherein the critical data portion is associated with the operability of the consist.

15. The consist of claim 14, wherein at least one of the first transceiver and the second transceiver is further configured to communicate a third data signal indicative of a noncritical data portion of the dataset over at least one of the first communication line and the second communication line, wherein the third data signal has a lower priority than the first data signal and the second data signal.

16. The consist of claim 14, wherein at least one of the first signal and the second signal is further indicative of the noncritical data portion.

17. The consist of claim 14, wherein the processor is further configured to:

detect a first signal strength of the first data signal and a second signal strength of the second data signal;

compare the first and second signal strengths to determine which of the first data signal and the second data signal has a greater signal strength; and

identify the more accurate signal as the first data signal or second data signal having the greater signal strength.

18. The consist of claim 14, wherein the critical data includes at least one of a signal indicative of brake pressure and a signal indicative of speed associated with the consist.

19. The consist of claim 14, further including:

a plurality of heartbeat lines, each heartbeat line configured to transmit a heartbeat signal from one of the first and second transceivers, wherein the processor is further configured to detect the heartbeat signal from at least one of the first and second transceivers and determine whether the at least one of the first and second transceivers is functioning properly, and when the first transceiver is not functioning properly, direct transmission of the critical and noncritical data portions to the second transceiver.

20. The consist of claim 19, wherein the processor is further configured to:

identify a first quality-of-service metric for the critical data portion and a second quality-of-service metric for the noncritical data portion; and

direct transmission of both the critical data portion and the noncritical data portion over the second communication line using a link aggregation protocol while maintaining at least one of the first quality-of-service metric and the second quality-of-service metric.