Electronic control apparatus for a fuel injection system in internal combustion engines

US4245590A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Werner Grozinger · Mühlacker, DE
• Friedrich Rabus · Schwieberdingen, DE

Key dates

• Filing date: Feb 2, 1979
• Grant date: Jan 20, 1981
• Expiry date: Feb 2, 1999

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/32
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An electronic control apparatus for a fuel injection system in internal combustion engines which has a timing device for the generation of electric injection pulses, whose duration is dependent on operating characteristics and which are delivered to at least one electromagnetic injection valve which includes a time control circuit associated with the timing device in order to form at least one limiting value for the subsequent injection pulse and the subsequent injection pulse as well as the at least one limiting value can be delivered to a selector circuit so as to limit variations with respect to the duration of the injection signal thereby achieving smooth operation of the internal combustion engine. On the basis of an injection pulse at time tn, limiting values are formed for the duration of the subsequent injection pulse, and the next subsequent injection pulse at time tn+1 is kept within the limiting value which has been generated, it being particularly favorable to form the electronic control apparatus using digital structural elements, by means of which not only a high degree of precision and reliability but also an easy adaptation to other digital systems is obtained.