公开(公告)号：US20210071609A1

公开(公告)日：2021-03-11

申请号：US17014302

申请日：2020-09-08

Applicant: DENSO CORPORATION

Inventor： Masashi INABA ,  Yuusuke SHIMIZU

IPC: F02D41/20 ,  F02D41/30 ,  F02D41/00 ,  F02M51/00

Abstract: An energization instruction switch switches energization instruction signals to instruct energization of fuel injection valves. A first cylinder designation switch designates one of the energization instruction signals to designate a valve closing detection cylinder. A valve closing detection unit monitors downstream voltage of the fuel injection valve to detect occurrence of an inflection point in change of the downstream voltage to detect a valve closing. A second cylinder designation switch designates one of the downstream voltages and designates the valve closing detection cylinder. A valve closing time measuring unit measures a valve closing time, which is from a switching timing of the energization instruction signal from ON to OFF to a valve closing detection timing, for injection of the valve closing detection cylinder. A valve closing time learning unit learns the valve closing time measured by the valve closing time measuring unit.