公开(公告)号：US11131264B2

公开(公告)日：2021-09-28

申请号：US16101688

申请日：2018-08-13

Applicant: DENSO CORPORATION

Inventor： Masahiro Watanabe ,  Daiji Ueda ,  Hiroki Tanada

IPC: F02D41/00 ,  F02D41/20 ,  F02M51/06 ,  F02M47/02

Abstract: A fuel injection control device has a valve opening control portion which opens a control valve by electrically charging a piezoelectric element, and a valve closing portion which closes the control valve. The valve opening control portion includes a first rising control portion, a pause control portion and a second control portion. The first rising control portion increases a charge amount of the piezoelectric element during a first rising period. The pause control portion pauses an increase in the charge amount of the piezoelectric element during a pause period after the first rising period. The second rising control portion increases the charging amount of the piezoelectric elements again during a second rising period after the pause period. The pause period includes a period of immediately before the control valve is opened.

公开(公告)号：US10151400B2

公开(公告)日：2018-12-11

申请号：US14169265

申请日：2014-01-31

Applicant: DENSO CORPORATION

Inventor： Katsuhiro Ichihashi ,  Fumiaki Arikawa ,  Naoki Mitsumata ,  Masahiro Watanabe

IPC: F16K1/34 ,  F16K31/06 ,  F16K31/40 ,  F02M63/00

Abstract: An electromagnetic valve includes a driving portion, a valve body, and a valve element. The driving portion generates a magnetic attractive force according to an energization. The valve body has an orifice through which a fluid flows, and a valve seat around an opening portion of the orifice. The valve element displaces according to the magnetic attractive force and a fluid force that is applied from the fluid, to vary a passage area between the valve element and the valve seat. When the valve element is placed at a position separated farthest from the valve seat, the passage area between the valve element and the valve seat is less than or equal to a passage area of the orifice.