Method of controlling operation of automated guided vehicle

• US 4,993,507 A
• Filed: 11/20/1989
• Issued: 02/19/1991
• Est. Priority Date: 05/11/1988
• Status: Expired due to Fees

• Current Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Original Assignee: Toyota Jidosha Kabushiki Kaisha (Toyota Motor Corporation)
• Inventors: Ohkura, Akira
• Primary Examiner(s): Marmor, Charles A.
• Assistant Examiner(s): Johnson, Brian L.
• Application Number:
  US07/439,010
• Time in Patent Office: 456 Days
• Field of Search: 180/167, 180/168, 180/169, 246/182 R, 318/587, 340/438, 340/439, 340/459, 340/936, 364/424.01, 364/424.02, 364/426.01, 364/440
• US Class Current: 180/168
• CPC Class Codes: G05D 1/0223 involving speed control of the vehicle vehicle fittings for automatically controlling, i.e. preventing speed from exceeding an arbitrarily established velocity or maintaining speed at a particular velocity, as selected by the vehicle operator B60K31/00
• CPC Class Codes: G05D 1/0265 using buried wires

Abstract

A method of controlling the operation in a factory of an A.G.V. which automatically travels along a predetermined route consisting of a plurality of production lines having different line contacts and adapted to perform parts assembly or packaging. Optimum travel speeds with respect to all the lines are previously stored in the A.G.V. When the A.G.V. enters one of the production lines, it is instructed from the outside to travel constantly at a previously stored speed assigned to this production line. Thus, operations of the production line are successively performed.

Claims

1. A method of controlling the operation of an automated guided vehicle A.G.V. to carry workpieces along production lines to a plurality of successive work stations at a speed corresponding to a predetermined distinctive workpiece conveyor speed for the respective production line in a manufacturing area of a plant, comprising the steps of:

defining a boundary of the manufacturing area with a transportation line having a work load entrance station and a work load exit station;

providing a plurality of parallel spaced production lines, within the defined boundary;

providing a plurality of successively disposed work stations along each production line;

connecting the transportation line and each production line by a guide wire provided in the manufacturing area floor;

propelling the A.G.V. at a transportation line speed by detecting a magnetic field generated continuously from the transportation line to each of the production lines and from each production line to the transportation line;

generating a speed command signal adjacent the entrance and exit ends of each production line for controlling the A.G.V. entering and exiting a respective production line;

storing on the A.G.V. speed data corresponding to a predetermined distinct workpiece conveyor speed for each production line;

each distinct workpiece conveyor speed being continuous and each being less than the transportation line speed through the work stations of each production line;

each distinct workpiece conveyor speed being the desired speed for performing manufacturing operations at the work stations along each corresponding production line;

detecting on the A.G.V. the generated speed command signals of the corresponding entrance and exit end of the respective production line;

decreasing the speed of the A.G.V. from the transportation line speed to the respective stored speed for the corresponding production line until the speed of the A.G.V. is equal to the distinct workpiece conveyor speed in response to the generated speed command signal at the entrance end of a respective production line;

propelling the A.G.V. at the corresponding stored distinct workpiece conveyor speed along the production line continuously; and

increasing the speed of the A.G.V. to the speed of the transportation line speed in response to the generated speed command signal at the exit end of the corresponding production line.