Method and system for merge control in an automated vehicle system

• US 8,145,368 B2
• Filed: 05/26/2009
• Issued: 03/27/2012
• Est. Priority Date: 05/26/2008
• Status: Expired due to Fees

• Current Assignee: Posco Holdings Incorporated
• Original Assignee: Posco Holdings Incorporated
• Inventors: Andreasson, Ingmar, Won, Jin Myung
• Primary Examiner(s): Alsomiri, Isam
• Application Number:
  US12/994,540
• Publication Number:
  US 20110125350A1
• Time in Patent Office: 1,036 Days
• Field of Search: 701/20, 701/117, 701/119, 246/182
• US Class Current: 701/20
• CPC Class Codes: B61L 15/0027 Radio-based, e.g. using GSM-R
• CPC Class Codes: B61L 15/0072 On-board train data handling
• CPC Class Codes: B61L 25/02 Indicating or recording positions or identities of vehicles or trains
• CPC Class Codes: B61L 27/16 Trackside optimisation of vehicle or train operation
• CPC Class Codes: G08G 1/01 Detecting movement of traffic to be counted or controlled G08G1/07 - G08G1/14 take precedence
• CPC Class Codes: G08G 1/20 Monitoring the location of vehicles belonging to a group, e.g. fleet of vehicles, countable or determined number of vehicles

Abstract

A method of controlling merging of a plurality of streams of vehicles in an automated vehicle system. The method comprises: Defining a merge control zone associated with a merge point, the merge control zone defining at least respective sections of the upstream tracks leading to the merge point; detecting a vehicle entering the merge control zone on a first one of the upstream tracks; allocating a passage time to the vehicle, the passage time being indicative of a time at which the vehicle is scheduled to pass the merge point; wherein allocating the passage time is based on a merge priority assigned to the vehicle according to a predetermined set of merge priority rules; controlling a speed of the vehicle responsive to the allocated passage time.

Claims

1. A method of controlling merging of a plurality of streams of vehicles in an automated vehicle system, the automated vehicle system including a network of tracks along which the vehicles are adapted to travel, the network including at least one merge point at which at least two upstream tracks merge to form a downstream track, the method comprising:

defining a merge control zone associated with the merge point, the merge control zone defining at least respective sections of the upstream tracks;

detecting a vehicle entering the merge control zone on a first one of the upstream tracks, the vehicle being a vehicle of a sequence of one or more vehicles approaching the merge point on said first upstream track;

allocating a passage time to the detected vehicle, the passage time being indicative of a time at which the vehicle is scheduled to pass the merge point;

wherein allocating the passage time is based on a merge priority assigned to the vehicle according to a predetermined set of merge priority rules;

controlling a speed of the vehicle responsive to the allocated passage time.

2. A method according to claim 1, comprising assigning a merge priority to the vehicle according to the predetermined set of merge priority rules, wherein at least one merge priority rule is a function of a property of at least one vehicle of said sequence of vehicles.

3. A method according to claim 2, wherein the property is a load status of the at least one vehicle of said sequence of vehicles.

4. A method according to claim 3, comprising assigning a higher merge priority to loaded vehicles than to empty vehicles.

5. A method according to claim 4, further comprising communicating the allocated passage time to the vehicle;

and wherein controlling the speed of the vehicle is performed by the first vehicle responsive to the communicated passage time.

6. A method according to claim 3, further comprising communicating the allocated passage time to the vehicle;

and wherein controlling the speed of the vehicle is performed by the first vehicle responsive to the communicated passage time.

7. A method according to claim 2, the method comprising assigning a higher priority to a vehicle followed by a first number of vehicles than to a vehicle followed by a second number of vehicles, the second number being smaller than the first number.

8. A method according to claim 7, further comprising communicating the allocated passage time to the vehicle;

and wherein controlling the speed of the vehicle is performed by the first vehicle responsive to the communicated passage time.

9. A method according to claim 2, the method comprising assigning a higher priority to a vehicle followed by a first sequence of vehicles on the first upstream track than to another vehicle followed by a second sequence of vehicles on a second upstream track, the first upstream track having a lower free capacity than the second upstream track.

10. A method according to claim 9, further comprising communicating the allocated passage time to the vehicle;

and wherein controlling the speed of the vehicle is performed by the first vehicle responsive to the communicated passage time.

11. A method according to claim 2, further comprising communicating the allocated passage time to the vehicle;

and wherein controlling the speed of the vehicle is performed by the first vehicle responsive to the communicated passage time.

12. A method according to claim 1, further comprising communicating the allocated passage time to the vehicle;

and wherein controlling the speed of the vehicle is performed by the first vehicle responsive to the communicated passage time.

13. A method according to claim 1, wherein controlling the speed of the vehicle comprises communicating one or more speed commands for adjusting the speed of the vehicle to a motor controller adapted to control one or more motors for propelling the vehicle along the track.

14. A method according to claim 1, the method comprising monitoring a distance between the vehicle and at least another vehicle in the merge control zone, the other vehicle travelling along a second one of the upstream tracks different from the first track.

15. A method according to claim 14;

wherein monitoring comprises

representing the other vehicle by a virtual shadow vehicle travelling along the first upstream track at a position corresponding to a position of the other vehicle along the second upstream track; and

monitoring the distance as a distance between the vehicle and the shadow vehicle.

16. A method according to claim 14, the method comprising:

controlling the vehicle speed of at least one of the vehicle and the other vehicle so as to maintain a predetermined minimum distance between the vehicle and the other vehicle.

17. A method according to claim 16, wherein the minimum distance is a function of a vehicle distance of at least one of the vehicle and the other vehicle from the merge point, wherein the minimum distance increases with decreasing vehicle distance from the merge point.

18. A method according to claim 17, wherein the minimum distance increases to at least a predetermined safety distance between vehicles travelling along the same downstream track.

19. A method according to claim 1, wherein the automated vehicle system is a personal rapid transit system.

20. A control system for controlling merging of a plurality of streams of vehicles in an automated vehicle system, the automated vehicle system including a network of tracks along which the vehicles are adapted to travel, the network including at least one merge point at which at least two upstream tracks merge to form a downstream track, the system comprising:

means for detecting a vehicle entering a merge control zone associated with the merge point on a first one of the upstream tracks, the merge control zone defining at least respective sections of the upstream tracks, the vehicle being a vehicle of a sequence of one or more vehicles approaching the merge point on said first upstream track;

means for allocating a passage time to the vehicle, the passage time being indicative of a time at which the vehicle is scheduled to pass the merge point;

wherein allocating the passage time is based on a merge priority assigned to the vehicle according to a predetermined set of merge priority rules;

means for controlling a speed of the vehicle responsive to the allocated passage time.