Title: Electronic demarcating system
Application Number: 03812947 Application Date: 2003.06.03
Publication Number: 1659489 Publication Date: 2005.08.24
Approval Pub. Date: Granted Pub. Date:
International Classifi-cation: G05D1/03,A01D34/00
Applicant(s) Name: Electrolux AB Address:
Inventor(s) Name: Petersson Ulf
Attorney & Agent: guo saiyu
Abstract:
     The present invention relates to a method and an electronic search system for operating an automatic device, preferably an automatic lawnmower. The system comprises at least one first electrical cable ( 1, 4, 5, 6 ) connected to at least one first signal generator ( 3, 7, 8 ) and at least one sensing system arranged on said device. Said sensing system detects at least one magnetic field being transmitted via said cable ( 1, 4, 5, 6 ) and propagating through the air, the sensing system transmitting a processed signal to at least one driving means which contributes to the movements of said device in relation to a surface. Said search system comprises means by which the first signal generator ( 3, 7, 8 ) of the present invention transmits a current through said first cable ( 3, 7, 8 ), said current during a part of time being is in a state of rest where it is substantially constant, said state periodically being interrupted by at least one first characteristic current pulse.
Time: 7
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