Fuel injection valve and pressure sensor combination

US6318342A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Stefan Simon · Cologne, DE
• Holger Krebs · Erdmannhausen, DE

Key dates

• Filing date: May 18, 2000
• Grant date: Nov 20, 2001
• Expiry date: May 18, 2020

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D35/023
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injector-pressure sensor combination for fuel injection systems for direct injection of fuel into the combustion chamber of an internal combustion engine and for measurement of the pressure in the combustion chamber includes a piezoelectric or magnetostrictive element. The piezoelectric or magnetostrictive element is positively connected with a valve closer which interacts with a valve seat face to form a sealing seat. In addition, an electronic control and analysis circuit is provided which activates the piezoelectric or magnetostrictive element during a fuel injection phase in such a way that the valve closer activated by the piezoelectric or magnetostrictive element lifts off from the valve seat face and opens the seat. During a pressure measurement phase, the control and analysis circuit detects a pressure in the combustion chamber transmitted from the valve closer to the piezoelectric or magnetostrictive element and converted by the latter into an electric signal.