Managing method of a run of moving objects

• US 5,038,290 A
• Filed: 08/31/1989
• Issued: 08/06/1991
• Est. Priority Date: 09/13/1988
• Status: Expired due to Fees

• Current Assignee: Tsubakimoto Chain Company
• Original Assignee: Tsubakimoto Chain Company
• Inventors: Minami, Hideaki
• Primary Examiner(s): Black, Thomas G.
• Assistant Examiner(s): AUCHTERLONIE, THOMAS
• Application Number:
  US07/401,023
• Time in Patent Office: 705 Days
• Field of Search: 364/424.01, 364/424.02, 364/424.03, 364/424.04, 364/436, 364/437, 364/439, 364/441, 364/461, 364/578
• US Class Current: 701/117
• CPC Class Codes: G05D 1/0291 Fleet control monitoring fleets in traffic control systems for road vehicles G08G1/127, G08G1/127

Abstract

A managing method of a run of a moving object of the present invention commonly utilizes a first scheduling using a simulation for finding a shortest time for selecting the moving object and running route corresponding to the moving demand, and a second scheduling in which a deadlock attributable to a predetermined moving sequence is not generated, performing the first scheduling using the simulation first and when it is not fulfilling a predetermined condition, performing the second scheduling.

Claims

1. A managing method of a run of movable objects, comprising the steps of:

moving movable objects between communicating stations that are at locations along a plurality of running routes in response to movement demands which require that the movable objects be moved to the communicating stations; and

avoiding deadlocks from arising as between the movable objects along the routes during the step of moving, the step of avoiding including;

a first step of simulation for attempting to satisfy each of the movement demands by simulating possible sequences of movement of the movable objects along the running routes based on consideration of an amount of time required for the movable objects to stay at the communicating stations and time required to move between the communicating stations, judging whether a condition has been fulfilled by comparing a number of times of shunting with a predetermined number, the shunting being a diversion of at least one of the movable objects to another location from a location on the running route of another of the movable objects as simulated in response to one of the movement demands, selecting said movable objects and said running routes along which said selected movable objects are to run in an effort to satisfy each of said movement demands, and allocating movements to the selected movable objects along the selected running routes only if the condition is judged as being fulfilled, and

a second step of retrieval of a moving sequence of the movable objects for fulfilling each of said movement demands when said condition is judged as being not fulfilled by the first step, the second step being based on each of said movement demands and on an arrangement of the movable objects after completion of the allocated movements of said movable objects, the second step including choosing the movable objects and the running routes along which the chosen movable objects are to run to fulfill said movement demands, the second step also including allocating movements to the chosen movable objects along the chosen running routes in accordance with the retrieval of the moving sequence.

2. A managing method as in claim 1, wherein at said first step, when a number of shunting is more than the predetermined number, said condition is judged as not being fulfilled, and the simulation for one of said movement demands is abandoned and that for another movement demand is performed.

3. A managing method as in claim 2, wherein said condition is decided based on a number of abandoned simulations.

4. A managing method as in claim 1, wherein at said first step, when the running time of the movable object simulated is longer than a predetermined time, said condition is judged as not being fulfilled, and the simulation for said moving demand is abandoned and that for the other moving demand is performed.

5. A managing method as in claim 4, wherein said condition is decided based on a number of abandoned simulations.

6. A managing method as in claim 1, wherein the judging of whether said condition has been fulfilled with respect to each of the possible sequences of movement being simulated is based on number of times of shunting of the movable objects along the running routes that takes place during the simulating of possible sequences of movement.

7. A managing method as in claim 1, wherein the step of moving includes moving the movable objects between communicating stations in two opposite directions along the same route between the communicating stations.