MATERIAL HANDLING VEHICLE LOCATION SYSTEM

摘要

The object of the invention is to provide a system which can be constituted quite compactly for detecting actual position of a material handling vehicle in a warehouse in which a plurality of racks composed of upright frame members and lateral frame members connecting the upright members are installed so that material handling vehicles can travel along the passageway between the racks so that current position of the material handling vehicle in the warehouse can be detected with increased reliability even if some of the reflections fail to be received by the sensors. A first reflector plate S is attached to each of the upright frame members and a plurality of second reflector plates R are attached to the lateral frame member along longitudinal direction thereof, a first sensor 3 and a second sensor 4 each for emitting a light beam and receiving reflection thereof from each of the first and second reflector plates are attached to the vehicle, and a controller is installed on the vehicle to estimate current location of the vehicle based on combination of the number of reflections actually received by the first and second reflector plates and counted by the controller.