Variable path automated guided vehicle

• US 7,991,521 B2
• Filed: 01/31/2007
• Issued: 08/02/2011
• Est. Priority Date: 02/01/2006
• Status: Expired due to Fees

• Current Assignee: Jervis B Webb Company (Daifuku Company Limited)
• Original Assignee: Jervis B Webb Company (Daifuku Company Limited)
• Inventors: Stewart, Brian G.
• Primary Examiner(s): Nguyen; Cuong H
• Application Number:
  US11/669,612
• Publication Number:
  US 20070179690A1
• Time in Patent Office: 1,644 Days
• Field of Search: 701 23- 25, 701/41, 701/200, 180/411, 180/6.2, 180/7, 180/168, 180/7.1, 180/170, 180/167, 700/248, 318/587, 280/5.508, 348/113
• US Class Current: 701/23
• CPC Class Codes: G05D 1/0265 using buried wires

Abstract

An automated guided vehicle and a method of controlling an automated guided vehicle which are capable of varying the travel path of the automatic guided vehicle in order to reduce wear patterns created in the floor of the material handling facility. The travel path of the AGV is varied by intentionally applying a deviation from a selected predetermined route along which the AGV is traveling.

Claims

1. A method of controlling a plurality of automated guided vehicles (AGVs) between stations along predetermined routes, said method comprising:

instructing a first AGV to follow a predetermined route along a travel surface to a destination station;

instructing the first AGV to apply a first deviation to the travel path of the first AGV so that the travel path of the first AGV does not match the predetermined route;

instructing a second AGV to follow said predetermined route along said travel surface to said destination station; and

instructing the second AGV to apply a second deviation to the travel path of the second AGV so that the travel path of the second AGV does not match the travel path of the first AGV.

2. The method of claim 1 further including a step of setting a limit to said applied deviation.

3. The method of claim 1 wherein said applied deviations include deviations in a turning radius of a vehicle, deviations in the distance traveled before performing a directional control operation with the AGV, an offset distance from the predetermined route, angling of the travel path relative to the predetermined route, or combinations of the above.

4. The method of claim 1 wherein said step of applying a deviation includes applying multiple minor deviations along the predetermined route to vary the travel path from the predetermined route.

5. The method of claim 1 further including the step of correcting the travel path if the AGV is displaced from the predetermined route by a greater than allowed range.

6. The method of claim 1 further including the step of matching the travel path to the predetermined route before the AGV reaches the station.