| 摘要 |
PROBLEM TO BE SOLVED: To materialize efficient initial drive without being affected by the change with the lapse of time or the change of environment, concerning a current controller for an electromagnetic drive valve. SOLUTION: At initial drive of the electromagnetic drive valve, this controller detects the change in the direction of displacement of a moving member, based on the output of a lift sensor or the like, and when the displacement direction of the moving member changes from the valve-opening direction to the valve-closing direction, it switches the destination of current application of an exciting current from the first electromagnet (lower electromagnet) to the second electromagnet (upper electromagnet), and when the displacement direction of the moving member changes from the valve-opening direction to the valve-closing direction, it switches the destination of current application of the exciting current from the second electromagnet to the first electromagnet. The switching always in optimum timing becomes possible even if there is a change with the lapse of time or a change of environment, by performing the switching, according to the change of the displacement direction of the moving member, without fixing a switching cycle this way. COPYRIGHT: (C)2006,JPO&NCIPI
|
