Bi-fuel injector, in particular for combustion engines, and method of injection

US6431471B1 · kind B1 · utility

Assignee

• Daimlerchrysler AG · US

Inventors

• Claus Anzinger · Neutraubling, DE
• Attila Bokodi · Munich, DE
• Eberhard Holder · Eßlingen, DE
• Gerhard Kroetz · Munich, DE
• Wolfgang Legner · Höhenkirchen-Siegertsbrunn, DE
• Viktor Pfeffer · Esslingen am Neckar, DE

Key dates

• Filing date: Dec 1, 2000
• Grant date: Aug 13, 2002
• Expiry date: Jan 22, 2021

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M51/0682
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A flushable bi-fuel injector, in particular for combustion engines, comprises a nozzle body incorporating a nozzle exit (11), a movably held valve needle (12) for opening and closing the nozzle exit (11), a first supply channel (13) for supplying a first liquid or a first fuel to the nozzle exit (11); and a second supply channel (23) for supplying a second liquid or a second fuel or a liquid additive to the nozzle exit (11). A ring-shaped slide gate (21) or a ring piston is arranged in a ring-shaped chamber (20) within the nozzle body (1). The slide gate (21) can be hydraulically activated to either side via differential pressure. Depending on its position, the slide gate (21) connects either the first supply channel (13) or the second supply channel (23) to the nozzle exit (11).During operation, depending on operational requirements, either a first liquid or a first fuel or a second liquid which can be a second fuel or a starting fuel, is conveyed to a combustion chamber of an internal combustion engine, with the pressure differential between the first liquid and the second liquid causing switchover of the supply in the bi-fuel injector.