Fuel injection apparatus for internal combustion engines, particularly diesel engines

US4306528A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Max Straubel · Stuttgart, DE
• Konrad Eckert · Stuttgart, DE

Key dates

• Filing date: Feb 22, 1979
• Grant date: Dec 22, 1981
• Expiry date: Feb 22, 1999

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02B3/06
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel injection apparatus for internal combustion engines, in particular food Diesel engines, including a mechanically driven injection pump, preferably embodies as a pump/nozzle assembly, in which the piston speed of the pump piston is variable for the purpose of controlling the peak pressure. By means of a control apparatus, operating in accordance with rpm, the stroke motion which is transmitted from a drive cam to the pump piston is varied by shifting the effective cam range during the fuel supply stroke, or by varying the lever ratio in the drive apparatus of the pump piston in such a manner that the piston speed, which otherwise varies in proportion to the engine speed, remains either substantially constant or is adapted to a predetermined speed variation. As an additional capability, the apparatus includes a correction apparatus which compensates for an undesired variation in the onset of the fuel supply caused by the control apparatus or corrects it to a predetermined value dependent on operating characteristics of the engine.