Travel control device for unmanned conveyance vehicle
US8406949B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Mar 12, 2010 |
| Grant date | Mar 26, 2013 |
| Priority date | — |
| Expiry date | Oct 27, 2030 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG05D1/0261
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An unmanned conveyance vehicle (11) includes a detecting device (23) that has a plurality of sensing elements (25), first to fourth marker sensors (31-34) arranged on both sides of the sensing elements 25, and a magnetic member (35). The sensing elements (25) detect positions of guide tapes (12, 13) laid down along a road travel surface. The marker sensors (31-34) detect magnetic markers (14A-14D) laid down along the road travel surface. The magnetic member (35) is arranged above the sensing elements (25) and the marker sensors (31-34). When a left end (35a) of the magnetic member (35) moves to a position above the branch guide tape (13), the first marker sensor (31) operates, and the left end (35a) is magnetized to the north pole by the magnetic flux of the branch guide tape (13). A right end (35b) of the magnetic member (35) is magnetized to the south pole to operate the third marker sensor (33). As a result, ON signals are output from the first and third marker sensors (31, 33) to an erroneous determination preventing section (52) of a control unit (22). The erroneous determination preventing section (52) determines the ON signals to be invalid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.