Railway operation monitoring and diagnosing systems

• US 6,125,311 A
• Filed: 12/31/1997
• Issued: 09/26/2000
• Est. Priority Date: 12/31/1997
• Status: Expired due to Fees

• Current Assignee: Maryland Technology Corp.
• Original Assignee: Maryland Technology Corp.
• Inventors: Lo, James Ting-Ho
• Primary Examiner(s): Zanelli, Michael J.
• Application Number:
  US09/001,662
• Time in Patent Office: 1,000 Days
• Field of Search: 701/19, 701/35, 701/29, 246/167 R, 246/169 R
• US Class Current: 701/29
• CPC Class Codes: B61L 2205/04 Satellite based navigation systems, e.g. global positioning system [GPS]
• CPC Class Codes: B61L 27/53 for trackside elements or systems, e.g. trackside supervision of trackside control system conditions
• CPC Class Codes: B61L 27/57 for vehicles or trains, e.g. trackside supervision of train conditions

Abstract

To enhance the safety and security of the operation of a railway network, a railway operation monitoring and diagnosing system is disclosed that monitors and diagnoses the entire railway network as an integrated system. The railway operation monitoring and diagnosing system comprises a railway operation predictor and a diagnosing means. The railway operation predictor generates anticipated values of selected railway operation state (ROS) variables. ROS variables may discrete or continuous. If there are continuous ROS variables selected, the railway operation predictor also determines the safety intervals of these continuous ROS variables. The diagnosing means examines the measured values of the selected ROS variables versus their anticipated values and/or safety intervals to detect and diagnose their discrepancies. A heuristics, statistics, fuzzy logic, artificial intelligence, neural network, or/and expert system is included in the diagnosing means for diagnosing the records of such discrepancies. If necessary, the railway operation predictor generates pessimistically anticipated values of a plurality of selected ROS and possibly other variables for further diagnosing the railway operation. The diagnosing means issues a diagnosis report and/or a recommendation, whenever the diagnosing means decides that such an issuance is appropriate.

Claims

1. A system for monitoring and diagnosing an operation of a railway network, said system comprising

a railway operation predictor for generating anticipated values of a plurality of discrete railway operation state variables;

and

diagnosing means for detecting and diagnosing discrepancies between anticipated values and measured values of said discrete railway operation state variables,

wherein said diagnosing means compares anticipated values and measured values of said discrete railway operation state variables for a first detection time after said measured values for said first detection time are received by said diagnosing means; and

if a discrepancy between said anticipated values and measured values for said first detection time is detected, said diagnosing means diagnoses said discrepancy.

2. The system in claim 1, wherein an anticipated value of a railway operation state variable for a second detection time is determined by using a master train schedule and measured and anticipated values of at least one railway operation state variable for up to and including said second detection time, under the assumption that no unexpected or abnormal event starts to occur between two consecutive detection times ending at said second detection time.

3. The system in claim 1, wherein an anticipated value of a train'"'"'s location for a third time is a predicted value of said location given measured values of said train'"'"'s locations for up to and including said third time.

4. The system in claim 3, wherein anticipated values of at least one of said discrete railway operation state variables are generated by said railway operation predictor through simulating, with the use of anticipated values of locations of at least one train, interaction between said at least one train and at least one of signal and control systems.

5. The system in claim 1, wherein a record of discrepancies for at least one of said discrete railway operation state variables is maintained.

6. The system in claim 5, wherein said diagnosing means examines said record of discrepancies in diagnosing discrepancies for said at least one of said discrete railway operation state variables.

7. The system in claim 6, wherein at least one of heuristics, statistics, fuzzy logic, artificial intelligence, neural network, and expert systems is used in diagnosing said record of discrepancies.

8. The system in claim 1, wherein said railway operation predictor is also for generating pessimistically anticipated values of at least one of said discrete railway operation state variables for further diagnosing a discrepancy.

9. A system for monitoring and diagnosing an operation of a railway network, said system comprising

a railway operation predictor for generating anticipated values of a plurality of discrete railway operation state variables and determining safety intervals of a plurality of continuous railway operation state variables;

and

diagnosing means for detecting and diagnosing discrepancies between anticipated values and measured values of said discrete railway operation state variables and for detecting and diagnosing discrepancies between safety intervals and measured values of said continuous railway operation state variables,

wherein said diagnosing means compares anticipated values and measured values of said discrete railway operation state variables for a first detection time and compares safety intervals and said measured values of said continuous railway operation state variables for said first detection time after said measured values for said first detection time are received by said diagnosing means;

if a first discrepancy is detected between said anticipated values and measured values of said discrete railway operation state variables for said first detection time, said diagnosing means diagnoses said first discrepancy; and

if a second discrepancy is detected between said safety intervals and measured values of said continuous railway operation state variables for said first detection time, said diagnosing means diagnoses said second discrepancy.

10. The system in claim 9, wherein an anticipated value of a railway operation state variable for a second detection time is determined by using a master train schedule and measured and anticipated values of at least one railway operation state variable for up to and including said second detection time, under the assumption that no unexpected or abnormal event starts to occur between two consecutive detection times ending at said second detection time.

11. The system in claim 9, wherein at least one of said continuous railway operation state variables is a variable in a power distribution system.

12. The system in claim 9, wherein an anticipated value of a location of a train for a third time is a predicted value of said location given measured values of said train'"'"'s locations up to and including said third time.

13. The system in claim 12, wherein anticipated values of at least one of said discrete railway operation state variables are generated by said railway operation predictor through simulating, with the use of anticipated values of locations of at least one train, interaction between said at least one train and at least one of signal and control systems.

14. The system in claim 9, wherein at least one train'"'"'s location is a continuous railway operation state variable, and a safety interval of said location is determined with the use of a master train schedule.

15. The system in claim 9, wherein a record of discrepancies for at least one of said railway operation state variables is maintained.

16. The system in claim 15, wherein said diagnosing means examines said record of discrepancies in diagnosing discrepancies for said at least one of said railway operation state variables.

17. The system in claim 16, wherein at least one of heuristics, statistics, fuzzy logic, artificial intelligence, neural network, and expert systems is used in diagnosing said record of discrepancies.

18. The system in claim 9, wherein said railway operation predictor is also for generating pessimistically anticipated values of at least one of said railway operation state variables for further diagnosing a discrepancy.