公开(公告)号：US09653200B2

公开(公告)日：2017-05-16

申请号：US14684481

申请日：2015-04-13

Applicant: DENSO CORPORATION

Inventor： Atsushi Ito ,  Toshio Nishimura ,  Takeshi Akiyoshi

IPC: H01H9/00 ,  H01F7/18 ,  F01L9/04 ,  F02D41/20

CPC classification number: H01F7/1844 ,  F01L9/04 ,  F02D41/20 ,  F02D2041/2058 ,  H01F7/1805 ,  H01F2007/1888

Abstract: An electromagnetic-valve controller includes a control switch, a control portion regulating a supply current supplied to the electromagnetic valve by controlling a drive of the control switch and controlling to open or close the electromagnetic valve, and a current detection portion detecting the supply current. The control portion controls the drive of the control switch based on a detection result of the current detection portion. The control portion controls the drive of the control switch by using a first pulse signal having a duty ratio that is variable, in a closed period. The control portion controls the drive of the control switch by using a second pulse signal maintaining the supply current to be constant so as to maintain the electromagnetic valve to be in the fully closed state, in a closed-state maintaining period.