| 摘要 |
A circuit and a method for periodically energizing an electromagnet of the kind useful for driving a gas exchange valve in an internal combustion engine by measuring either the increase in energizing current or the decay of the holding current during an energization cycle to determine the instant at which energization must commence for the next following cycle to assure flawless engagement of the armature of the electromagnet with the stator in this next cycle. |
