| 摘要 |
FIELD: transport engineering; antitheft devices; remote control of fuel delivery in automobile fuel systems. SUBSTANCE: use is made of additional winding connected in opposition to main winding and arranged so that both windings embrace ends of core. Permanent magnet is used as core which is fixed by magnetic circuit detents in two extreme positions. Core is held fixed for a long time until electromagnetic valve is switched over which is done by short-time delivery of polar voltage to windings connected in opposition; thanks to it like poles S-S or N-N are formed on magnetic detents. These poles act simultaneously on permanent magnet core one end of which is repelled and the other is attracted. In process of changing over first repelling force prevails and at the end of process, attracting force. Combined action of forces improves reliability of changing over. Electromagnetic valve features "magnetic memory" which improves efficiency of antitheft device as a whole. According to invention, electromagnetic valve with bistable condition both in open and closed positions is designed. EFFECT: enhanced reliability of protection. |
