US 10,378,476 B2Granted

Internal combustion engine

AssigneeToyota Jidosha Kabushiki Kaisha

InventorMasato Ikemoto

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Abstract

A post injection is utilized in a more effective manner. In an internal combustion engine which is provided with a fuel injection valve for injecting fuel into a cylinder of the internal combustion engine, in cases where a post injection is carried out after a main injection of fuel from the fuel injection valve, when a rotation speed of the internal combustion engine is equal to or more than a first predetermined speed, a penetration force of fuel in the post injection is made larger than a penetration force of fuel in the main injection, whereas when the rotation speed of the internal combustion engine is less than a second predetermined speed which is equal to or less than the first predetermined speed, the penetration force of fuel in the post injection is made smaller than the penetration force of fuel in the main injection.

An internal combustion engine which is provided with a fuel injection valve for injecting fuel into a cylinder of the internal combustion engine,

said internal combustion engine including an electronic control unit configured to control the fuel to be injected from said fuel injection valve when a post injection is carried out after a main injection, the electronic control unit being configured to control said fuel injection valve to make a penetration force of fuel in the post injection larger than a penetration force of fuel in the main injection by accordingly changing a valve opening speed of a needle in said fuel injection valve when a rotation speed of said internal combustion engine is equal to or more than a first predetermined speed, whereas when the rotation speed of said internal combustion engine is less than a second predetermined speed which is less than said first predetermined speed, the electronic control unit is configured to control said fuel injection valve to make the penetration force of fuel in the post injection smaller than the penetration force of fuel in the main injection by accordingly changing the valve opening speed of the needle in said fuel injection valve,
wherein when the rotation speed of said internal combustion engine is equal to or more than said second predetermined speed, and at the same time is less than said first predetermined speed, said electronic control unit carries out the post injection a plurality of times after the main injection, and when the post injection is carried out the plurality of times after the main injection, the post injection is divided into a plurality of sub-injections, such that each sub-injection of the plurality of sub-injections has a respective penetration force of fuel, and
wherein when said post injection is carried out by being divided into the plurality of sub-injections, said electronic control unit carries out the post injection such that the plurality of sub-injections includes a first sub-injection in which the penetration force of fuel is larger than that in the main injection, and a second sub-injection in which the penetration force of fuel is smaller than that in the main injection, and makes a ratio of an amount of fuel injection in said first sub-injection with respect to a total amount of fuel injection in the post injection higher in accordance with an increasing rotation speed of said internal combustion engine.

Facts

Application

14/921,419Filed 23 Oct 2015

Priority

JP 2014-22178930 Oct 2014

Published

US 2016/0123270 A15 May 2016

Granted

13 Aug 2019

Term ends

Not estimatedThe source records don’t support an estimate.

Classification13 codes

F02D 41/405
Multiple injections: with post injections
F02D 41/20
Electrical control of supply of combustible mixture or its constituents: output circuits, e.g. for controlling currents in command coils
F02D 41/3836
Common rail control systems: controlling the fuel pressure
F02D 41/047
Introducing corrections for particular operating conditions: taking into account fuel evaporation or wall wetting

Abstract

Claims4