公开(公告)号：US11015546B2

公开(公告)日：2021-05-25

申请号：US16512819

申请日：2019-07-16

申请人： KEIHIN CORPORATION

发明人： Atsushi Ogawa ,  Motoaki Kato ,  Kengo Nomura

IPC分类号： F02D41/20 ,  F01L9/04

摘要： An electromagnetic valve drive device includes: a state detection unit configured to detect an on-state or an off-state of a first switch and a second switch forming a boosting circuit; a boosting control unit configured to control a boosting operation, by performing a synchronous rectification control on switching of the first switch and the second switch, depending on the state of the first switch or the second switch detected by the state detection unit; and a drive circuit configured to drive an electromagnetic valve by supplying a voltage boosted by the boosting operation to the electromagnetic valve.

公开(公告)号：US11466650B2

公开(公告)日：2022-10-11

申请号：US16708821

申请日：2019-12-10

申请人： KEIHIN CORPORATION ,  Panasonic Intellectual Property Management Co., Ltd.

发明人： Atsushi Ogawa ,  Motoaki Kato ,  Kengo Nomura ,  Keisuke Kuroda ,  Takashi Ryu

IPC分类号： F02M51/00 ,  F02D41/30 ,  B05B1/30

摘要： This fuel includes: a first switching element disposed between a booster circuit boosting a battery power and one end of a solenoid; a second switching element disposed between a battery and one end of the solenoid; a third switching element disposed between the other end of the solenoid and a ground; a fourth switching element disposed between one end of the solenoid and a ground; and a control unit configured to control open/closed states of the first switching element, the second switching element, the third switching element, and the fourth switching element. The control unit is configured to open the fourth switching element during a valve closing detection period of detecting closing of a fuel injection valve and to detect the closing of the fuel injection valve on the basis of a change in voltage of the other end of the solenoid.

公开(公告)号：US11047328B2

公开(公告)日：2021-06-29

申请号：US16512819

申请日：2019-07-16

申请人： KEIHIN CORPORATION

发明人： Atsushi Ogawa ,  Motoaki Kato ,  Kengo Nomura

IPC分类号： F02D41/20 ,  F01L9/04

摘要： An electromagnetic valve drive device includes: a state detection unit configured to detect an on-state or an off-state of a first switch and a second switch forming a boosting circuit; a boosting control unit configured to control a boosting operation, by performing a synchronous rectification control on switching of the first switch and the second switch, depending on the state of the first switch or the second switch detected by the state detection unit; and a drive circuit configured to drive an electromagnetic valve by supplying a voltage boosted by the boosting operation to the electromagnetic valve.

公开(公告)号：US11319912B2

公开(公告)日：2022-05-03

申请号：US17110852

申请日：2020-12-03

申请人： KEIHIN CORPORATION

发明人： Atsushi Ogawa ,  Motoaki Kato ,  Kengo Nomura

IPC分类号： F02M51/06 ,  B60R16/033

摘要： An electromagnetic valve driver includes: an electric power feeder configured to apply a power voltage obtained by switching a battery voltage to one end of an electromagnetic coil of an electromagnetic valve; a detector configured to detect a drive current flowing through the electromagnetic coil; and a power supply configured to supply power to the detector. The electric power feeder adjusts the drive current by operating in a state in which the power voltage is applied to the electromagnetic coil on the basis of a detection value of the detector. The power supply supplies the power obtained by sampling and holding a reference power in a period excluding a switching period of the battery voltage in the electric power feeder to the detector.