公开(公告)号：US20170226950A1

公开(公告)日：2017-08-10

申请号：US15501523

申请日：2015-07-14

Applicant: DENSO CORPORATION

Inventor： Makoto TANAKA

IPC: F02D41/24 ,  F02M51/06

CPC classification number: F02D41/2467 ,  F02D41/20 ,  F02D41/402 ,  F02D2041/1409 ,  F02D2041/141 ,  F02D2041/2003 ,  F02D2041/2034 ,  F02D2041/2044 ,  F02D2041/2058 ,  F02D2200/503 ,  F02M51/061 ,  F02M51/0664 ,  Y02T10/44

Abstract: An engine includes a fuel injector. The fuel injector includes a valve body and an electromagnetic part that moves by energizing the valve body from a valve-closed position to a valve-open position. The fuel injector injects fuel when the valve body is moved to the valve-open position. In fuel injection, an ECU feeds a pre-charge current smaller than a current for operating the valve body, to the electromagnetic part in a pre-charge period at the beginning of a start of energization, and subsequently feeds a drive current for operating the valve body, to the electromagnetic part. Further, the ECU acquires a current change parameter as a parameter correlated with a speed of a rising change in drive current, and controls the feed of the pre-charge current to the electromagnetic part of the fuel injector, based on the acquired current change parameter.