Automatic guided vehicle system having communication and traffic controller with unguided paths

• US 4,987,540 A
• Filed: 05/30/1989
• Issued: 01/22/1991
• Est. Priority Date: 05/30/1989
• Status: Expired due to Fees

• Current Assignee: WHS Robotics Incorporated
• Original Assignee: WHS Robotics Incorporated
• Inventors: Luke, Walter Jr.
• Primary Examiner(s): Lall, Parshotam S.
• Assistant Examiner(s): ZANELLI, MICHAEL J
• Application Number:
  US07/358,234
• Time in Patent Office: 602 Days
• Field of Search: 364/424.01, 364/424.02, 364/436, 364/460, 364/461, 364/449, 364/443, 318/587, 180/167, 180/168, 180/169
• US Class Current: 701/24
• CPC Class Codes: G05D 1/0265 using buried wires
• CPC Class Codes: G05D 1/0274 using mapping information stored in a memory device navigation using map-matching G01C21/30
• CPC Class Codes: G05D 1/0285 using signals transmitted via a public communication network, e.g. GSM network

Abstract

A system for allowing an automatic guided vehicle (AGV) to move from a first guided area to a second guided area across an unguided span that separates them. A first guidance structure such as a buried cable is displaced from a second guidance structure. A communications and traffic controller is connected to each of the first and second guidance structures. Also connected to the communications and traffic controller is a transponder for signalling when an AGV is leaving the first guided area.

Claims

1. A system for allowing an automatic guided vehicle (AGV) to move from a first guided area to a second guided area across an unguided span therebetween, comprising:

(a) a first guidance means associated with a first guided area;

(b) a second guidance means associated with a second guided area, said second guidance means being displaced a predetermined distance from said first guidance means, said predetermined distance defining an unguided span;

(c) at least one communications and traffic control means including a high speed communications processor means operatively connected to each of said first and second guidance means for facilitating communications between said first and second guidance means in accordance with a predetermined protocol;

(d) means operatively connected to said communications and traffic control means for signalling when an AGV is leaving said first guided area;

(e) means operatively connected to said communications and traffic control means for signalling when an AGV is entering said second guided area;

(f) master control means operatively connected to at least one of said communications and traffic control means for facilitating communications between a plurality of communications and traffic control means; and

(g) a local area controller operatively connected to said master control means, said master control means facilitating communications between said local area controller and said at least one of said communications and traffic control means.

2. The system in accordance with claim 1, further comprising a serial communications bus connected between said at least one communications and traffic control means and said first and second guidance means, and wherein said predetermined protocol is accomplished by means of said serial communications bus protocol.

3. The system in accordance with claim 1 wherein said first guidance means and said second guidance means comprise electrical wires.

4. The system in accordance with claim 1 wherein said first guidance means and said second guidance means define a travel path for said AGV and said AGV travel path further comprises said unguided span.

5. The system in accordance with claim 4 wherein said first guided area and said guided area are disposed, respectively, in a first and in a second building.

6. The system in accordance with claim 1, wherein said master control means comprises a high speed communications processor means for facilitating communications in accordance with a predetermined protocol.

7. The system in accordance with claim 1, further comprising:

an ancillary display means operatively connected to said master control means for displaying system status.

8. The system in accordance with claim 7 wherein said ancillary display means comprises a high speed communications processor means for facilitating communications in accordance with a predetermined protocol.

9. The system in accordance with claim 1, wherein said local area controller comprises a high speed communications processor means for facilitating communications in accordance with a predetermined protocol.

10. The system in accordance with claim 9, further comprising:

ancillary display means operatively connected to said local area controller for displaying system status.

11. The system in accordance with claim 10 wherein said ancillary display means comprises a high speed communications processor means for facilitating communications in accordance with a predetermined protocol.

12. A system for allowing an automatic guided vehicle (AGV) to move from a first guided area to a second guided area across an unguided span therebetween, comprising:

(a) a first guided area controller associated with a first guided area;

(b) a second guided area controller associated with a second guided area, said second guided area controller being displaced a predetermined distance from said first guided area controller, said predetermined distance defining an unguided span;

(c) communications and traffic control means operatively connected to each of said first and second guided area controllers;

(d) a transponder operatively connected to said communications and traffic control means for signalling when an AGV is leaving said first guided area;

(e) means operatively connected to said communications and traffic control means for signalling when said AGV is entering said second guided area; and

(f) presence sensing means operatively connected to said communications and traffic control means for providing a redundant indicating signal when said AGV is leaving said first guided area.