Method for controlling fuel injection in internal combustion engines and fuel injection system for performing the method

US4633837A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Rudolf Babitzka · Kirchberg, DE
• Ernst Linder · Mühlacker, DE
• Wilhelm Polach · Asperg, DE

Key dates

• Filing date: Sep 24, 1985
• Grant date: Jan 6, 1987
• Expiry date: Sep 24, 2005

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02M63/0007
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

To control the fuel injection pressure, in particular in high-pressure injection in self-igniting internal combustion engines, the pumping or supply phase of a cam-driven, intermittently operating pump piston of a fuel injection pump is determined by the closing time of a relief-metering valve and controlled in such a manner that the closing of the relief-metering valve for the supply onset (FB) is earlier, by the amount .DELTA..alpha., than the opening of control valves by way of which the fuel pumped by the pump piston is supplied to the individual injection locations. By means of the initial pumping amount or pre-stroke (.DELTA.h or .DELTA..alpha.), fuel is pumped into a closed system, and the injection pressure present at the injection valve at the instant of the opening (SB) is thus controlled.