Fuel injector

US9068540B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Holger Rapp · Hemmingen, DE
• Helmut Clauss · Tamm, DE
• Wolfgang Stoecklein · Stuttgart, DE
• Bernd Berghaenel · Mühlacker, DE
• Marco Beier · Leonberg, DE
• Changyi Wang · Kornwestheim, DE

Key dates

• Filing date: Oct 18, 2011
• Grant date: Jun 30, 2015
• Expiry date: Nov 12, 2031

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M2200/247
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a fuel injector for injecting fuel into the combustion chamber of an internal combustion engine, comprising a nozzle needle (1) which is able to perform stroke motions and by the stroke motion of which at least one injection opening can be exposed or closed, and further comprising a control valve (2) for controlling the stroke motion of the nozzle needle (1) in that, depending on the respective switch position of the control valve (2), hydraulic pressure applied in closing direction to the nozzle needle (1) in a control chamber (3) is altered, and further comprising a sensor array (4) for detecting the needle closing time. According to the invention, the sensor array (4) is arranged in the low-pressure area of the fuel injector in a space (5) which is sealed with respect to the fuel-conducting area (6). Sealing of the space (5) is effected by a membrane (7) made of a fuel-resistant, electrically conductive material, allowing the membrane (7) to also be utilized for implementing a ground connection.