Patent application number | Description | Published |
20090064970 | METHOD FOR TAKING INTO ACCOUNT THE OUTGASSING OF FUEL FROM THE ENGINE OIL OF AN INTERNAL COMBUSTION ENGINE - The invention deals with a method for operating an internal combustion engine with engine oil as the lubricant and a fuel supply by means of direct injection, wherein an air number (lambda) of a fuel-air mixture supplied to the internal combustion engine is determined. Provision is made in the method according to the invention for the internal combustion engine to be transferred to an operating state with higher fuel consumption, when a low air number (lambda) is detected in driving conditions with a high percentage of fuel ingress from a crankcase ventilation system into the fuel-air mixture. By means of this increase in the fuel requirement, the fuel, which exited the engine oil into the intake air of the internal combustion engine, can be combusted; and an increase in the exhaust gas emissions by means of incompletely combusted fuel, in which typically hydrocarbons and carbon dioxide arise, can be avoided. In a warm-up phase of the internal combustion engine, the fuel, which ingressed into the engine oil, can thus likewise be combusted, even if under certain temperature-time conditions, particularly in the partial load operating mode and during idling, more fuel is present in the fuel-air mixture than is actually required for operating the internal combustion engine. | 03-12-2009 |
20090210132 | Method for Operating an Internal Combustion Engine - In an internal combustion engine, fuel is directly injected into at least one combustion chamber at least during a compression stroke in such a way that a stratified mixture is present in the combustion chamber. This mixture is then externally ignited. The fuel is introduced during the compression stroke by at least one main injection and an ignition injection, the ignition injection taking place immediately before an ignition and producing at least essentially no torque. | 08-20-2009 |
20100031919 | METHOD FOR CYLINDER SYNCHRONIZATION OF AN INTERNAL COMBUSTION ENGINE - The aim of the invention is to optimize the running smoothness of an internal combustion engine. To achieve this aim, the individual cylinders are synchronized with respect to their torque contribution. According to the method, fuel is injected into the combustion chamber of a cylinder in at least one injection step, the at least one injection contributing to the torque of the internal combustion engine. Fuel is injected into the combustion chamber of the cylinder in a torque neutral manner by way of a secondary injection during a working stroke of the cylinder and the amount of fuel of the secondary injection us calculated in such a manner that the exhaust gas substantially corresponds to a stoichiometric air/fuel mixture. | 02-11-2010 |
20100282214 | METHOD FOR CONTROLLING A FUEL INJECTION SYSTEM OF AN INTERNAL COMBUSTION ENGINE - In a method for controlling a fuel injection system ( | 11-11-2010 |
20110118959 | METHOD AND APPARATUS FOR DETERMINING AND REGULATING AN EXHAUST GAS RECIRCULATION RATE OF AN INTERNAL COMBUSTION ENGINE - The invention relates to a method and an apparatus for determining an exhaust gas recirculation rate in an internal combustion engine, in which the exhaust gas recirculation rate indicates a proportion of exhaust gas in a gas quantity delivered to a cylinder of the internal combustion engine, and combustion takes place in the cylinder of the engine cyclically during a combustion phase. The method includes the steps of ascertaining a combustion course statement over the course of combustion in the cylinder of the engine, and ascertaining an actual exhaust gas recirculation rate from the combustion course statement with the aid of a predetermined exhaust gas recirculation rate function. The invention further relates to a method and an apparatus for regulating an exhaust gas recirculation rate in an internal combustion engine, in which the exhaust gas recirculation rate indicates a proportion of exhaust gas in a gas quantity delivered to a cylinder of the internal combustion engine, and combustion takes place in the cylinder of the engine cyclically during a combustion phase. The method includes the steps of ascertaining a combustion course statement over the course of combustion in the cylinder of the engine, furnishing a set-point statement as a function of an operating point of the engine, and performing a regulation to compensate for a deviation that results from the set-point statement and the combustion course statement. | 05-19-2011 |
20120152203 | Method and control unit for operating an injector of an internal combustion engine - In a method for operating an injector of an internal combustion engine of a motor vehicle, in which an actuator for driving a component of the injector is provided, the actuator is controlled in such a way that at least two partial injections are brought about within a working cycle of the internal combustion engine. For each partial injection, a starting point in time of the partial injection is ascertained. | 06-21-2012 |
20130068197 | METHOD AND DEVICE FOR CONTROLLING THE EXHAUST GAS RECIRCULATION RATE FOR INTERNAL COMBUSTION ENGINES DURING LEAN OPERATION - A method for setting an exhaust gas recirculation rate in an engine system having an internal combustion engine, the exhaust gas recirculation rate indicating the portion of the exhaust gas recirculated into one cylinder of the internal combustion engine with regard to the total gas quantity present in the cylinder, including: operating the internal combustion engine according to an input for the exhaust gas recirculation rate, an ignition of an air/fuel mixture being carried out in the cylinder at a certain ignition timing; adjusting the ignition timing in the cylinder of the internal combustion engine; correcting the input for the exhaust gas recirculation rate as a function of a change in an operating behavior of the internal combustion engine due to the ignition timing adjustment. | 03-21-2013 |
20140261305 | METHOD AND DEVICE FOR OPERATING AN INTERNAL COMBUSTION ENGINE - In a method for operating an internal combustion engine during a catalytic converter heating phase, fuel in at least two portions is injected directly into at least one combustion chamber, a first portion of the fuel being injected during an intake stroke and an injection of a second portion of the fuel taking place directly before an ignition. The second portion is continuously reduced until a freely selectable boundary value of a torque fluctuation has been reached. | 09-18-2014 |