Method and apparatus for fuel metering in internal combustion engines

US4359991A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Gerhard Stumpp · Stuttgart, DE
• Ludwig Walz · Stuttgart, DE
• Gerhard Schielinsky · Schwaikheim, DE
• Wolf Wessel · Oberriexingen, DE
• Thomas Kuttner · Stuttgart, DE
• Ulrich Flaig
• Fridolin Piwonka · Asperg, DE
• Hermann Eisele · Leinfelden, DE
• Andreas Boehringer · Stuttgart, DE
• Hans Kubach · Ditzingen, DE
• Johannes Locher · Stuttgart, DE
• Waldemar Becker · Graben-Neudorf, DE

Key dates

• Filing date: Jan 26, 1981
• Grant date: Nov 23, 1982
• Expiry date: Jan 26, 2001

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y02T10/40
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

A fuel control system for an internal combustion engine with correction for optimum values based on a variety of factors. Characteristic engine data is stored in preferably digital memories with capabilities for interpolation. Upon addressing the engine data fields with input signals related to current operational variables, for example the accelerator pedal position, the control system derives therefrom a nominal air flow rate which is used as the reference value in a control loop that sets the amount of recycled exhaust gas and the fresh air flow. As the actual air flow rate approaches the reference value, the fuel flow is adjusted to insure correct mixtures at all times. In another embodiment, the fuel is supplied on demand but cannot exceed a maximum value except under special override conditions. Several other embodiments and variants are presented.