Fuel control system of engine

Patent metadata

Field	Value
Publication number	US-2016281663-A1
Application number	US-201615055196-A
Country	US
Kind code	A1
Filing date	Feb 26, 2016
Priority date	Mar 27, 2015
Publication date	Sep 29, 2016
Grant date	—

Abstract

A fuel control system of an engine is provided which controls, by using a tumble flow, a behavior of fuel directly injected into a combustion chamber formed inside a cylinder of the engine. The fuel control system includes a fuel injector for directly injecting the fuel into the combustion chamber, a tumble flow generator for generating the tumble flow within the combustion chamber, and a fuel injector controlling module for causing the fuel injector to inject the fuel at a first injection timing and then inject a smaller amount of fuel than an amount injected at the first injection timing, in a direction opposing a positive direction of the tumble flow at a second injection timing, the first injection timing designed to be in an intake stroke of the cylinder, the second injection timing designed to be in a latter half of the compression stroke of the cylinder.

First claim

1 . A fuel control system of an engine, the fuel control system controlling, by using a tumble flow, a behavior of fuel directly injected into a combustion chamber formed inside a cylinder of the engine, the fuel control system comprising:
a fuel injector for directly injecting the fuel into the combustion chamber; a tumble flow generator for generating the tumble flow within the combustion chamber; and a fuel injector controlling module for causing the fuel injector to inject the fuel at a first injection timing and then inject a smaller amount of fuel than an amount injected at the first injection timing, in a direction opposing a positive direction of the tumble flow, at a second injection timing, the first injection timing designed to be in an intake stroke of the cylinder, the second injection timing designed to be in a latter half of a compression stroke of the cylinder.

2 . The fuel control system of claim 1 , wherein the second injection timing is designed to be between 50° and 90° before a top dead center of the compression stroke.

3 . The fuel control system of claim 1 , wherein the fuel injector controlling module causes the fuel injector to inject 10% to 20% of a total fuel injection amount in one operation cycle of the cylinder at the second injection timing.

4 . The fuel control system of claim 1 , wherein the tumble flow generator is an intake port of the engine,
wherein an ignition plug of the engine is provided in a center portion of a ceiling of the combustion chamber, wherein the fuel injector is disposed at a position of a circumferential edge portion of the ceiling of the combustion chamber on a side where the intake port is provided, and injects the fuel obliquely downward and toward an opposite side from the intake port, wherein the engine has a piston having a crown face, and the crown face is formed with an inclined surface extending along an extending direction obliquely upward and toward the side where the fuel injector is provided, from an end portion of the crown face on an opposite side from the fuel injector, and wherein the second injection timing is designed to be a timing at which an injection direction of the fuel by the fuel injector opposes the extending direction of the inclined surface of the crown face.

5 . The fuel control system of claim 4 , wherein the injection direction of the fuel by the fuel injector is parallel to the extending direction of the inclined surface of the crown face.

6 . The fuel control system of claim 1 , wherein the fuel injector controlling module causes the fuel injector to inject the fuel at the second injection timing when an operating state of the engine in a warmed-up state is within an operating range of the engine where an engine load is relatively high and an engine speed is relatively low, and the fuel injector controlling module does not cause the fuel injector to inject the fuel at the second injection timing when the operating state of the engine in the warmed-up state is outside the operating range where the engine load is relatively high and the engine speed is relatively low or when the engine is in a cold state.

Assignees

• Mazda Motor

Inventors

• Sasaki Junsou
• Yamaguchi Naohiro
• Oda Yusuke
• Wada Yoshitaka
• Honda Yuya

Classifications

• Y02T10/12

  Improving ICE efficiencies · CPC title

• F02B67/10

  of charging or scavenging apparatus · CPC title

• F02B2275/14

  Direct injection into combustion chamber · CPC title

• F02F3/24 Primary

  having means for guiding gases in cylinders, e.g. for guiding scavenging charge in two-stroke engines · CPC title

• F02M45/04 Primary

  with a small initial part {, e.g. initial part for partial load and initial and main part for full load} · CPC title