Fuel injection pump for internal combustion engines

US5188083A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Berni Reisser · Notzingen, DE
• Hannes Pflug · Gerlingen, DE
• Mohammad-Ali Khosrawi · Ludwigsburg, DE
• Michael Scharf · Wolfenbüttel, DE
• Helmut Simon · Göppingen, DE
• Christian Taudt · Winnenden, DE
• Wolfgang Goll · Ilsfeld, DE
• Paul Wuetherich · Schwieberdingen, DE
• Thomas Fortenbacher · Gerlingen, DE
• Karl Konrath · Ludwigsburg, DE

Key dates

• Filing date: May 29, 1992
• Grant date: Feb 23, 1993
• Expiry date: May 29, 2012

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2200/0606
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention is based on a fuel injection pump in which to supply a very rapid pressure rise in the interior of a fuel injection pump, a pressure valve controlling this pressure is modified such that upon cold starting of the engine, the pressure valve closes a bypass line at the feed pump and thus delivers all the fuel to the fuel injection pump. The closure is effected as a function of rpm and accordingly pressure, and also as a function of the engine operating temperature; in the fuel injection pump according to the invention, the rpm- and pressure-dependent diversion is performed by the adjusting piston of an injection adjuster. Thus, compared with the known cold-starting accelerating devices, one additional pressure limiting valve can be eliminated.