公开(公告)号：US20160245202A1

公开(公告)日：2016-08-25

申请号：US15027834

申请日：2014-10-06

Applicant: DENSO CORPORATION

Inventor： Hiroyuki FUKUDA ,  Akihiro OKAMOTO ,  Ryohei TAKAHASHI

IPC: F02D41/00 ,  F02D41/26 ,  F02D41/40

CPC classification number: F02D41/0085 ,  F02D41/2448 ,  F02D41/2467 ,  F02D41/26 ,  F02D41/3845 ,  F02D41/40 ,  F02D2200/0602 ,  F02M63/0225 ,  Y02T10/44

Abstract: It is determined whether the execution conditions for the injection quantity variation correction are met, based on whether all of following conditions are satisfied: the engine operation is the stationary operation, the injection quantity of a fuel injection valve falls within the predetermined range, and the fuel pressure falls within the predetermined range. When the execution conditions are met, the fuel pressure decrease caused by the fuel injection of the fuel injection valve for each cylinder is calculated based on the output of a fuel pressure sensor, and the injection quantity variation correction to correct the injection quantity variation of the fuel injection valve for each cylinder is performed based on the fuel pressure decrease caused by the fuel injection of each cylinder. Thus, the fuel pressure decrease can be accurately calculated, the injection quantity variation of each cylinder is precisely corrected.

Abstract translation: 基于是否满足以下所有条件来确定是否满足喷射量变化校正的执行条件：发动机操作是静止操作，燃料喷射阀的喷射量落在预定范围内，并且 燃料压力落在预定范围内。 当满足执行条件时，基于燃料压力传感器的输出计算由每个气缸的燃料喷射阀的燃料喷射引起的燃料压力降低，并且喷射量变化校正以校正喷射量变化 基于由每个气缸的燃料喷射引起的燃料压力降低执行每个气缸的燃料喷射阀。 因此，可以精确地计算燃料压力的降低，精确地校正各气缸的喷射量变化。

公开(公告)号：US20170363036A1

公开(公告)日：2017-12-21

申请号：US15523415

申请日：2015-11-02

Applicant: DENSO CORPORATION

Inventor： Akihiro OKAMOTO

IPC: F02D41/38 ,  F02D41/24

CPC classification number: F02D41/3809 ,  F02D41/0085 ,  F02D41/2429 ,  F02D41/2448 ,  F02D41/2467 ,  F02D41/3863 ,  F02D41/402 ,  F02D2041/389 ,  F02D2200/0602 ,  F02D2200/0616 ,  F02D2250/04 ,  Y02T10/44

Abstract: An ECU has a fuel pressure sensor that detects fuel pressure inside of a common rail. The ECU detects the fuel pressure at a predetermined frequency and calculates a drop amount of the fuel pressure in accordance with fuel injection by fuel injectors based on the detected fuel pressure. The ECU acquires a fluctuation amount of a fuel injection amount of each of the fuel injectors based on the drop amount of the fuel pressure and learns an injection characteristic of each of the fuel injectors, the injection characteristic indicating a correlation between the fuel injection amount and the fluctuation amount of the fuel injection. In a case in which a detection timing of the fuel pressure is within a fuel injection period of a predetermined fuel injector, the ECU disallows the learning of the injection characteristic using the fuel pressure detected in the fuel injection period.