Method for taking the outgassing of fuel from the engine oil of an internal combustion engine into account

US8333179B2 · kind B2 · utility

Assignee

• Robert Bosch GmbH · DE

Inventors

• Georg Mallebrein · Stuttgart, DE
• Federico Buganza · Stuttgart, DE
• Carlos Koster · Campinas, BR
• Kai Jakobs · Echterdingen, DE
• Juergen Pfeiffer · Mehring, DE
• Emilie Hincker-Piocelle · Ludwigsburg, DE
• Pierre-Yves Crepin · Stuttgart, DE

Key dates

• Filing date: Sep 3, 2008
• Grant date: Dec 18, 2012
• Expiry date: Sep 3, 2028

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F02D2250/11
• WIPO field: Engines, pumps, turbines
• WIPO sector: Mechanical engineering

Abstract

The invention deals with a method for operating an internal combustion engine with engine oil as the lubricant, wherein a fuel mass flow outgassing from the engine oil is ascertained and is taken into account via a map-based pilot control during the metering of a quantity of fuel supplied to the internal combustion engine and wherein a fuel/air ratio supplied to the internal combustion engine is determined. Provision is made in the method according to the invention for a mass flow offset determined from the deviation of the fuel/air ratio supplied to the internal combustion engine from a nominal value to be taken into account when the metering of the quantity of fuel supplied to the internal combustion engine occurs during an effective duration of the map-based pilot control. The mass flow offset takes the deviation into account, which remained after the correction by a map-based pilot control of the quantity of fuel metered, on the basis of the modeled outgassing of fuel from the engine oil, and said mass flow offset balances the lambda controller in this way. The mass flow offset can by way of example have the effect of shortening the duration injection. The mixture deviations as…