Electricity: electrical systems and devices – Control circuits for electromagnetic devices – Systems for magnetizing – demagnetizing – or controlling the...
Patent
1983-12-01
1985-05-28
Eisenzopf, Reinhard J.
Electricity: electrical systems and devices
Control circuits for electromagnetic devices
Systems for magnetizing, demagnetizing, or controlling the...
123490, H01H 4732
Patent
active
045204209
ABSTRACT:
For controlling a pulse-operated electromagnetic valve, an energization voltage is applied to the actuating coil of the valve in response to a leading edge of the pulse to initiate an energization current. When the current reaches a predetermined peak value the voltage is decoupled from the coil to allow a circulating current to flow through a first path to decrease it at a higher rate. The circulating current is switched to a second path when it reaches a medium current value to decrease it at a lower rate. When the decreasing circulating current reaches a lower holding current value which is necessary to hold the valve operated, the voltage is coupled again to the coil to reinitiate the energization current, and when it reaches a higher holding current value lower than the medium current value the voltage is decoupled to reinitiate the circulating current. The higher and lower holding current values are successively detected to energize the coil with a current which is an average value of the higher and lower current values.
REFERENCES:
patent: 4180026 (1979-12-01), Schulzke et al.
patent: 4266261 (1981-05-01), Streit et al.
Ariyoshi Hiromi
Yokomori Iwao
Eisenzopf Reinhard J.
Nippondenso Co. Ltd.
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