Electronic system for controlling the fuel injection of an internal-combustion engine

US5239974A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Bernhard Ebinger · Ditzingen, DE
• Peter Schmidt · Waiblingen, DE
• Nikolaus Benninger · Lambach, DE
• Lutz Reuschenbach · Stuttgart, DE
• Eberhard Schnaibel · Hemmingen, DE

Key dates

• Filing date: May 7, 1992
• Grant date: Aug 31, 1993
• Expiry date: May 7, 2012

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D41/2441
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

An electronic system for controlling the fuel injection of an internal-combustion engine based on the load, rotational speed, and temperature, as well as at least an oxygen probe reading in the exhaust pipe. The system determines basic injection-quantity signal as well as a transition-compensation signal to adapt the injection fuel quantity in situations of acceleration and deceleration. The system stores an engine characteristics map for a wall-film-quantity signal, and dividing factors for acceleration and deceleration. The system generates a correction value (Wkor) for the wall-film quantity signal and correction factors (FWS1kor, FWS2kor) for the two dividing factors. Three methods are provided for changing the correction factors in connection with the adaptation and these are based on a direct calculation, based on an estimation of the missing quantity and incremental calculation, and based on an incremental adjustment based on the evaluation of the oxygen-probe voltage.