公开(公告)号：US09644562B2

公开(公告)日：2017-05-09

申请号：US14869460

申请日：2015-09-29

Applicant: DENSO CORPORATION

Inventor： Syohei Fujita

IPC: F02D41/22 ,  F02D41/20

CPC classification number: F02D41/221 ,  F02D41/20 ,  F02D2041/2058 ,  F02D2041/224

Abstract: In an injector driving apparatus, a driving circuit supplies a current individually to each coil of multiple injectors, a current detection element detects the current flowing in a common current flow path, which is common to the coils, a current supply period guard part forcibly stops the current supplied from the driving circuit to the coil upon determination that a measured period reached a predetermined set period based on a detection result of the current detection element, and a diagnosis part operates in a period of no fuel injection to check whether the current supply period guard part normally stops the current supplied to the coil, by continuously supplying the current to the coil for only a short period, which disables the injector to open a valve, and sequentially switches over the coils.

公开(公告)号：US10718287B2

公开(公告)日：2020-07-21

申请号：US15751272

申请日：2016-08-25

Applicant: DENSO CORPORATION

Inventor： Makoto Tanaka ,  Syohei Fujita

IPC: F02D41/20 ,  F02M51/00 ,  F02M61/10 ,  F02M51/06 ,  F02D41/40 ,  F02D41/34 ,  F02D41/36 ,  F02D45/00 ,  F02D41/14 ,  F16K31/06

Abstract: An injection control device controls a fuel injection valve driven by an electric power. The injection control device includes a current detection unit to detect a driving current supplied to a solenoid of the fuel injection valve, an identification unit to identify a theoretical model of the driving current in a state where a movable core moved by an electromagnetic force generated by the solenoid is at rest, and a state detection unit to detect a state of the movable core. The state detection unit detects the state of the movable core, based on a deviation between the driving current detected by the current detection unit and the theoretical model.