Fuel injection system

US4381751A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wolfgang Maisch · Schwieberdingen, DE
• Jürgen Peters · Marbach am Neckar, DE
• Michael Wissmann · Markgröningen, DE
• Karl Gmelin · Flein, DE
• Peter Stiefel · Ditzingen, DE

Key dates

• Filing date: Feb 20, 1981
• Grant date: May 3, 1983
• Expiry date: Feb 20, 2001

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M69/26
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection system is proposed which serves to provide the most precise possible adaptation of the fuel-air mixture to operating conditions of the internal combustion engine. The fuel injection system includes metering valves, each of which is assigned one regulating valve, whose movable valve element can be exposed on the one hand to the fuel pressure downstream of the respective metering valve and on the other hand to the pressure in a control pressure line, which is limited on the one hand by an electro-fluid converter of the nozzle/bounce plate type and on the other hand by a control throttle. The electro-fluid converter is triggerable in accordance with operating characteristics of the engine. A pressure limitation valve is embodied as a diaphragm valve and serves to regulate the most precise possible system pressure in the engine and, when the engine is shut off, it serves to reduce the fuel pressure in the fuel injection system below the fuel pressure required for opening the injection valves and to block the return flow lines.