Apparatus for metering an air-fuel mixture to an internal combustion engine

US4674459A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Eberhard Blocher · Schwieberdingen, DE
• Ferdinand Grob · Besigheim, DE
• Peter Schmidt · Schwieberdingen, DE
• Manfred Schmitt · Munich, DE
• Josef Wahl

Key dates

• Filing date: Jan 30, 1985
• Grant date: Jun 23, 1987
• Expiry date: Jan 30, 2005

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/2464
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention is directed to an apparatus for metering an air-fuel mixture to an internal combustion engine. The apparatus includes a characteristic field set up with operating quantities of the internal combustion engine for anticipatorily controlling engine variables that influence the air-fuel mixture and a control arrangement, responsive to at least one engine variable, for correctively influencing the characteristic field values. The characteristic field values are stored in the characteristic field and selected in dependence on operating quantities of the internal combustion engine. The characteristic field values are modified by means of different control methods to correctively influence the same. More specifically, the control methods include a control to a minimal specific fuel consumption in the lower and part-load ranges as well as a control to maximum power in the upper load range as may be necessary. This control arrangement can be realized, on the one hand, with an extreme-value control which is superposed either on the air or quantity of fuel delivered to the motor or, on the other hand, with a direct control of the air ratio .lambda. with an exhaust gas probe, for …