Method for the injection of fuel and fuel injection apparatus for performing the method

US4522174A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Rudolf Babitzka · Kirchberg, DE
• Ernst Linder · Mühlacker, DE

Key dates

• Filing date: Dec 7, 1983
• Grant date: Jun 11, 1985
• Expiry date: Dec 7, 2003

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/12
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A method for injecting fuel directly into a given combustion chamber of an internal combustion engine with externally supplied ignition in which the supply of air to the combustion chambers may be either throttled or unthrottled. To assure unobjectionable operation both at partial load and under full load, the fuel is introduced during partial-load operation with a large air excess, forming a layered charge, in the vicinity of the ignition location at a time immediately prior to the instant of ignition, while at full-load operation, in order to attain maximum power and soot-free combustion by means of a homogeneous fuel-air mixture, the supply of fuel takes place during the intake stroke of the engine piston defining the combustion chamber. In order to perform this method, a distributor-type fuel injection pump is provided, in which either one distributor opening or another distributor opening of two distributor openings comes into effective operation. The distributor openings are located at a fixed rotational angle spacing from one another, by means of which the advancement of the fuel injection at full load is fixed relative to the instant of injection at partial load.