H - Electricity – 03 – K
Patent
H - Electricity
03
K
342/38
H03K 17/64 (2006.01) F01L 9/04 (2006.01) H01F 7/18 (2006.01)
Patent
CA 1261036
ABSTRACT OF THE DISCLOSURE A method for actuation of a gas intake or exhaust valve which is electromagnetically held in its opened and closed posi- tions by an actuator assembly having a ferromagnetic element attractable by actuating solenoids. Control of the holding cur- rent flow through the solenoid coil is provided by a relaxation circuit element, and the excitation current is directly monitored and measured. Upon deexcitation of the coil and relaxation cir- cuit element activation, the decay current is not measured but is instead simulated. The relaxation circuit is supplied with pulsed current during the stationary phase of the valve, the current being measured in the pulse cycle during current supply, and is turned off upon exceeding a ceiling value. After the decay current has reached a threshold value, the current is turned on and permitted to rise momentarily. It is thereafter cycled off and on between an I1 and I2 value which is only about 10-20% of Imax, the capture current.
507554
Buchl Josef
Marks & Clerk
LandOfFree
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