Method and apparatus for providing destination and vehicle function information to an automatic guided vehicle

• US 4,780,817 A
• Filed: 09/19/1986
• Issued: 10/25/1988
• Est. Priority Date: 09/19/1986
• Status: Expired due to Fees

• Current Assignee: Nationsbank Of North Carolina, N.A. (Bank of America Corp.)
• Original Assignee: Ndc Technologies Inc. (Nordson Corporation)
• Inventors: Lofgren, Gunnar K.
• Primary Examiner(s): Chin, Gary
• Application Number:
  US06/909,611
• Time in Patent Office: 767 Days
• Field of Search: 364/424, 318/587, 180/167, 180/168, 180/169, 365/192
• US Class Current: 701/23
• CPC Class Codes: G05D 1/0261 using magnetic plots
• CPC Class Codes: G05D 1/0265 using buried wires

Abstract

A method for providing destination and vehicle function information to an AGV comprises the steps of providing one or more stationary dynamically codeable passage transducers (5) at predetermined spaced-apart points along an AGV path (220). The AGV path (220) is provided with a separate guidance wire (W1, W2, W3) or other guidance system. Each of the transducers (5) has a digital readable instruction set representing instructions to the vehicle. A transducer reader is provided on each AGV (200) for reading the instruction set of each transducer (5) as the AGV (200) proceeds along path 220 past the transducer (5) in reading relation. The instructions read are interfaced with the control system of the AGV (200) to provide a predetermined AGV (200) response. Additional steps in the method permit reprogramming of each transducer (5) by a reader/writer (129) on each AGV (200) to provide different instructions to a following AGV (200) and also a way of determining priority of movement between two converging AGVs (200).

Claims

1. An automatic guided vehicle (AGV) comprising:

(a) an AGV chassis with motive means thereon;

(b) guidance means for guiding said AGV along an AGV path;

(c) code reading means for reading information contained in a stationary dynamic code means positioned at predetermined spaced-apart points along the AGV path, each dynamic code means coded with distination, switching or vehicle function information;

(d) interfacing means between the motive means of said AGV and said code reading means for providing a predetermined AGV response in accordance with the information read by the code reading means;

(e) a dynamic code means programmer for erasing the information in the code means after being read by the code reading means and reprogramming said code reading means with information for being read by a following AGV.

2. A method for providing destination and vehicle function information to an automatic guided vehicle (AGV) comprising the steps of:

(a) providing one or more stationary dynamic code means at predetermined space-apart points along an AGV path, said AGV path having separate guidance means to be sensed and thereby followed by the AGV, each of the code means coded with destination, switching or vehicle function information;

(b) providing a code means reader on each AGV for reading the information of each code means as the AGV proceeds along the path past the code means;

(c) interfacing the information read by the code means with AGV control means to provide a predetermined AGV response;

(d) providing a code means programmer on each AGV;

(e) the programmer erasing the information in the code means after being read by the reader; and

(f) the programmer coding new information into the code means for being read by a following AGV.

3. A method according to claim 2 wherein the information contains stop/start and vehicle speed data.

4. A method according to claim 2 wherein the switching information is for instructing an AGV to guide on one of two or more path branches.

5. A method according to claim 2 wherein the information contains vehicle priority data for instructing one of two or more AGVs on different path branches to stop to allow the other AGV having a predetermined priority to proceed.