Fuel injection valve and fuel injection system

Patent metadata

Field	Value
Publication number	US-9309853-B2
Application number	US-201313768564-A
Country	US
Kind code	B2
Filing date	Feb 15, 2013
Priority date	Mar 30, 2012
Publication date	Apr 12, 2016
Grant date	Apr 12, 2016

Abstract

A fuel injection valve which has: swirl chambers each having an inner wall whose curvature is gradually increased from upstream to downstream along fuel flow; passages for swirling motion, the passages permitting introduction of fuel into the swirl chambers; fuel injection holes opening into the swirl chambers and including at least two narrow-angle injection holes and a wide-angle injection hole from which at least two narrow-angle sprays and a wide-angle spray are respectively ejected; and an orifice plate provided with the injection holes. The narrow-angle injection holes are spaced a given distance from the center of the orifice plate. The wide-angle injection hole is formed on a line perpendicularly intersecting a line segment that interconnects the centers of the narrow-angle injection holes.

First claim

The invention claimed is:

1. A fuel injection valve comprising:
swirl chambers each having an inner wall whose curvature is gradually increased from an upstream to a downstream along a flow of fuel direction;
passages for swirling motion, configured to permit introduction of fuel into the swirl chambers;
fuel injection holes opening into the swirl chambers and including at least two narrow-angle injection holes and a wide-angle injection hole from which at least two narrow-angle sprays and a wide-angle spray are respectively ejected; and
an orifice plate provided with the injection holes and having a center, wherein
the narrow-angle injection holes are spaced a given distance from the center of the orifice plate,
the wide-angle injection hole is formed on a bisecting line perpendicularly intersecting a line segment that interconnects centers of the narrow-angle injection holes, and
said wide-angle injection hole is smaller in axial length than said narrow-angle injection holes.

2. The fuel injection valve of claim 1 , wherein
a concavity that is larger in diameter than said wide-angle injection hole is formed on an exit side of the wide-angle injection hole.

3. A fuel injection system comprising:
an intake valve device for opening and closing an intake port;
a fuel injection valve as set forth in claim 1 and activated in response to a control signal from an engine controller, the fuel injection valve being disposed upstream of the intake valve device; and
an intake flow controller providing control of an intake flow;
wherein the fuel injection valve is so arranged that the wide-angle spray is directed to the intake flow whose flow is controlled by the intake flow controller.

4. A fuel injection system comprising:
an intake valve device for opening and closing an intake port;
a fuel injection valve as set forth in claim 2 and activated in response to a control signal from an engine controller, the fuel injection valve being disposed upstream of the intake valve device; and
an intake flow controller providing control of an intake stream;
wherein the fuel injection valve is so arranged that the wide-angle spray is directed to the intake flow whose flow is controlled by the intake flow controller.

5. The fuel injection system of claim 3 , wherein
said wide-angle spray is directed to an inner wall facing an inner wall of an intake pipe on which said fuel injection valve is disposed, and wherein said at least two narrow-angle sprays are generated toward the intake valve devices that open and close the intake port.

6. The fuel injection system of claim 4 , wherein
said wide-angle spray is directed to an inner wall facing an inner wall of an intake pipe on which said fuel injection valve is disposed, and wherein said plural narrow-angle sprays are generated toward the intake valve devices that open and close the intake port.

7. The fuel injection system of claim 1 , wherein the bisecting line passes through a center of the wide-angle injection hole and through a center of a center hole of the orifice plate.

Assignees

• Hitachi Automotive Systems Ltd

Inventors

• Okamoto Yoshio
• Yasukawa Yoshihito
• Maekawa Noriyuki
• Kobayashi Nobuaki
• Saito Takahiro

Classifications

• F02M61/162 Primary

  Means to impart a whirling motion to fuel upstream or near discharging orifices · CPC title

• F02M61/1806

  characterised by the arrangement of discharge orifices, e.g. orientation or size · CPC title

• F02M61/1853

  Orifice plates · CPC title

• F02M51/0664

  having a cylindrically or partly cylindrically shaped armature, e.g. entering the winding; having a plate-shaped or undulated armature entering the winding · CPC title

• F02M69/04 Primary

  Injectors peculiar thereto · CPC title