Title:
ニードル弁の直接制御装置を備えた燃料噴射器
Document Type and Number:
Japanese Patent JP4909461
Kind Code:
B2
Abstract:
A hydraulically-actuated unit fuel injector of the intensifier type is provided with two independently operable active control valves. A selectively actuable fuel pressure control valve is disposed on the hydraulic actuation fluid side to control the fuel pressure actuation process and provide a window of injection opportunity wherein the fuel pressure is maintained at high pressure. A selectively actuable timing control valve is disposed on the high pressure fuel side to provide precise control of injection timing events and duration, such as start of injection, end of injection, timing of interruption and duration of interruption, which all may occur during a single injection event within the window of opportunity. Both control valves are independently controlled to prevent reverse motion of the intensifier piston and plunger during dwell or interruption of injection while maintaining the full injection pressure. Dwell or interruption is controlled by using the timing control valve to port fuel under pressure to a fuel injector needle valve surface to generate a force on the fuel injector needle valve surface acting to close the fuel injector needle valve. Methods of defining a fuel injection event fuel injector having a fuel pressure intensifier, includes the steps of (a) preparing fuel pressure with a fuel injection pressure control valve, and (b) controlling the timing of a fuel injection event with a fuel injection timing control valve, the fuel pressure preparation and the timing of the fuel inject event being independently controllable. Preferably, full intensified fuel pressure is made available to the injector throughout a single injection event which may include a pilot injection, a main injection, a rate-shaped injection, and dwell periods wherein no injection occurs. Various methods of operating the fuel injector to provide various functions during a single injection event are also disclosed.
Inventors:
Rainin
Application Number:
JP2000577402A
Publication Date:
April 04, 2012
Filing Date:
September 28, 1999
Export Citation:
Assignee:
International Engine Intellectual Property Company Limited Liability Company
International Classes:
F02M57/02; F02M45/00; F02M45/04; F02M45/08; F02M47/00; F02M47/02; F02M51/00; F02M63/00; F02M63/02
Domestic Patent References:
| JP422059Y2 | ||||
| JP2526620B2 | ||||
| JP515572Y2 | ||||
| JP821332A | ||||
| JP6294362A | ||||
| JP7269440A | ||||
| JP6249459B2 | ||||
| JP544539B2 | ||||
| JP438910B2 |
Attorney, Agent or Firm:
Sadao Kumakura
Disciple Maru Ken
Ino Sato
Mitsuru Matsushita
Ichiro Kurasawa
Disciple Maru Ken
Ino Sato
Mitsuru Matsushita
Ichiro Kurasawa