Method and device for triggering a fuel injector

US6785112B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Rolf Reischl · Stuttgart, DE
• Andreas Eichendorf · Schorndorf, DE
• Ulf Pischke · Stuttgart, DE
• Juergen Eckhardt · Markgröningen, DE
• Klaus Mueller · Tamm, DE

Key dates

• Filing date: Aug 8, 2002
• Grant date: Aug 31, 2004
• Expiry date: Jan 10, 2023

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2041/2013
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method and device for triggering a solenoid valve for injecting fuel into an internal combustion engine is described. The triggering phase of the solenoid valve is subdivided into a pull-up phase and a holding phase. During the pull-up phase, a valve needle of the solenoid valve is caused to open by a first current intensity flowing through a magnetic coil of the solenoid valve. During the holding phase, the valve needle is held in the open state by a second, lower current intensity flowing through the magnetic coil. At least once at the beginning of the pull-up phase, a booster phase is activated during which a pulse-shaped booster current from a booster capacitor charged to a high voltage flows through the magnetic coil. During the triggering phase of the solenoid valve, a plurality of booster pulses are activated in succession, whose time position within the triggering phase is freely selectable.