Fuel injection process

US4941449A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Wolfgang Hoptner · Uhingen, DE
• Egbert Perenthaler · Stuttgart, DE
• Helmut Schwarz · Tübingen, DE

Key dates

• Filing date: Jan 5, 1989
• Grant date: Jul 17, 1990
• Expiry date: Jan 5, 2009

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/062
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a process for fuel injection in a multiple-cylinder internal combustion engine, opening signals for the respective injection valves of the individual cylinders are produced as a function of reference signals which are synchronous with the crankshaft. All injection valves are first controlled jointly after the ignition switch is switched on and the sequential opening signals for the sequential fuel injection are produced after the synchronization has been recognized. In order that the sequential fuel injection be switched on rapidly after the start of the internal combustion engine or after a disruption of the synchronization, wherein the fuel quantity injected into opened inlet valves is to be minimized, the opening signals are fed to the injection valves in a simultaneous manner, at least in a phase (a) until the synchronization has been recognized. In addition, the opening signals are simultaneously fed to the injection valves of those cylinders in a phase (b) which have not yet been changed over to sequential operation.