Fuel injection system for an internal combustion engine

US5529042A · kind A · utility

Assignee

• Mercedes-Benz A.G. · DE

Inventors

• Ulrich Augustin · Weingarten, DE
• Hermann Hiereth · Eßlingen, DE

Key dates

• Filing date: Feb 13, 1995
• Grant date: Jun 25, 1996
• Expiry date: Feb 13, 2015

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M63/00
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a fuel injection system for an internal combustion engine with solenoid valve controlled fuel injection nozzles receiving fuel from a common high pressure fuel supply line to which fuel is supplied via a high-pressure line including a check valve by a mechanically operated high pressure piston pump which has a piston disposed in a cylinder to which fuel is fed by a low pressure fuel supply line, a control line extends between the high-pressure line upstream of the check valve and the fuel supply line and includes a solenoid valve to permit fuel discharge from the pump back to the fuel supply line and a bypass line extends between the high-pressure line downstream of the check valve and the cylinder to provide communication with the fuel supply line through passages in the piston and the working space of the piston when the piston is in its inserted position and the solenoid is open to permit the release of pressurized fuel from the common high-pressure fuel supply line to the low pressure fuel supply line.