公开(公告)号：US20210396191A1

公开(公告)日：2021-12-23

申请号：US17289782

申请日：2019-10-11

Applicant: Hitachi Astemo, Ltd.

Inventor： Akiyasu MIYAMOTO ,  Takao MIYAKE ,  Ryo KUSAKABE

IPC: F02D41/20 ,  F02M61/18 ,  F02M51/06 ,  F02D41/24

Abstract: An object of the present invention is to promote the stabilization of the fuel injection amount in a fuel injection device in which a valve body and a movable iron core are configured to be relatively displaceable. In a control unit 120 of a fuel injection device 100 which includes a control part that controls the energization time of a current flowing through a coil 108 based on the pulse width of a drive command pulse, the control part is configured to be able to execute control to split a required fuel injection amount for one combustion cycle into portions and inject the portions in a plurality of times. In addition, in injections including a sequence of a preceding drive command pulse Pi1 and a subsequent drive command pulse Pi2, the control part acquires a preceding drive command pulse width Ti1 of the preceding drive command pulse Pi1 and a pulse interval Tint that is the time between the end time te1 of the preceding drive command pulse Pi1 and the start time ts2 of the subsequent drive command pulse Pi2, and corrects the subsequent drive command pulse width Ti2 of the subsequent drive command pulse Pi2 by using the preceding drive command pulse width Ti1 and the pulse interval Tint.

公开(公告)号：US20220120249A1

公开(公告)日：2022-04-21

申请号：US17418955

申请日：2020-02-07

Applicant: Hitachi Astemo, Ltd.

Inventor： Ryo KUSAKABE ,  Yoshihiro SUKEGAWA ,  Masayuki SARUWATARI

IPC: F02M61/18 ,  F02D41/40

Abstract: An object of the present invention is to enable forming of fuel sprays capable of suppressing discharge of PN, HC, and the like. Thus, in a fuel injection device 100 having a plurality of injection holes, the fuel injection device includes a first injection hole group 801 that is directed in a direction on an exhaust valve 211 side with respect to an intake valve 205 side, and a second injection hole group 802 that is directed in a direction on the intake valve 205 side with respect to the exhaust valve 211 side. A flow rate of the second injection hole group 802 is larger than a flow rate of the first injection hole group 801.

公开(公告)号：US20210388790A1

公开(公告)日：2021-12-16

申请号：US17291067

申请日：2019-10-11

Applicant: Hitachi Astemo, Ltd.

Inventor： Ryo KUSAKABE ,  Yoshihiro SUKEGAWA ,  Masayuki SARUWATARI

IPC: F02D41/20 ,  F02M51/06 ,  F02M61/18 ,  F02D41/40

Abstract: A shot variation in injection quantity of a fuel injection device is reduced. A control device according to an aspect of the present invention performs a first current control for a solenoid by a first current waveform by applying a reverse voltage to the solenoid before a mover or a valve collides with a fixed portion, when an injection quantity of a fuel from opening to closing of the valve of the fuel injection device is a set value or more. In addition, the control device performs a second current control for the solenoid by a second current waveform so that a current larger than a holding current holding the mover or the valve in a state of being in contact with the fixed portion flows to the solenoid, until the mover or the valve collides with the fixed portion, when the injection quantity of the fuel from opening to closing of the valve is less than the set value.