Method for adjusted air and fuel quantities for a multi-cylinder internal combustion engine

US5095874A · kind A · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Eberhard Schnaibel · Hemmingen, DE
• Erich Schneider · Tauberbischofsheim, DE
• Martin Klenk · Munich, DE
• Winfried Moser · Ludwigsburg, DE
• Christian Klinke · Pleidelsheim, DE
• Lutz Reuschenbach · Stuttgart, DE
• Klaus Benninger · Lambach, DE

Key dates

• Filing date: May 13, 1991
• Grant date: Mar 17, 1992
• Expiry date: May 13, 2011

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D43/00
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

In a method for adjusting air and fuel masses for a multi-cylinder internal combustion engine with individual injection for each cylinder, the fuel mass for each injection operation is calculated taking into account the probable intake-pipe pressure during the opening time of the inlet valve. After a change of the accelerator pedal, the throttle flap is only adjusted when the fuel masses decisive for the new throttle-flap position have been calculated and substantially ejected. By virtue of the fact that fuel masses to be injected are not calculated taking into account the current air mass flow but taking into account the intake-pipe pressure, which is decisive in the induction operation, and that a change in the actuation of the throttle flap, which would lead to a change in the intake-pipe pressure not taken into account in the calculation of the injection quantity, is only permitted again after a recalculation, an optimum ratio between fuel mass and air mass per charge for the purpose of obtaining a specified value for the air/fuel ratio is always obtained, even in non-steady-state conditions of an internal combustion engine. Apart from the future intake-pipe pressure, account i…