Patent application number | Description | Published |
20080208430 | Method And Device As Well As Computer Program For Controlling An Internal Combustion Engine - A method and a device as well as a computer program for controlling an internal combustion engine are provided, a torque model being used within the framework of calculating instantaneous variables and/or actuating variables. A correction of a basic value determined under standard conditions takes place in the process. In addition, to further improve the accuracy of the model, the efficiency for the conversion of the chemical into mechanical energy by which the optimum torque value is corrected, is determined at least as a function of a variable characterizing the combustion center point and a variable characterizing the opening instant of a discharge-side gas-exchange valve. | 08-28-2008 |
20080229817 | Method and device for operating an internal combustion engine having at least one cylinder - A method and a device for operating an internal combustion engine including at least one cylinder are described, the at least one cylinder including at least one intake valve and at least one exhaust valve and a diagnosis of at least one erroneous intake valve or at least one erroneous exhaust valve is made possible without using a position acknowledgment. A gas exchange of the at least one cylinder is diagnosed thereby. For detection of at least one intake valve or exhaust valve for the existence of an erroneous valve position, at least one intake valve or exhaust valve of the at least one cylinder different from at least one intake valve or exhaust valve to be detected is brought into a predefined position, which is selected in such a way that the gas exchange of the at least one cylinder in the case of an erroneous valve position of the at least one intake valve or exhaust valve to be detected differs significantly from the gas exchange of the at least one cylinder for the case of an error-free valve position of the at least one intake valve or exhaust valve to be detected, a value characteristic for the gas exchange of the at least one cylinder being ascertained, this value being expected at the moment for an error-free state of the set valve positions of the at least one intake valve and the at least one exhaust valve of the at least one cylinder, the actual value characteristic for the gas exchange of the at least one cylinder being ascertained and an error in the position of the at least one intake valve or exhaust valve to be detected is recognized as a function of the deviation in the actual value from the expected value. | 09-25-2008 |
20080236267 | Device and method for monitoring the intake manifold pressure of an internal combustion engine - A method and a device for monitoring the intake manifold pressure of an internal combustion engine in which a measured signal for the intake manifold pressure is compared with a reference signal for the intake manifold pressure. For a deviation of the measured signal for the intake manifold pressure from the reference signal for the intake manifold pressure, a tolerance range is predefined for error-free operation of the intake and/or exhaust valves of at least one cylinder of the internal combustion engine. A check is made whether the measured signal for the intake manifold pressure deviates from the reference signal for the intake manifold pressure by more than a predefined tolerance range. In this case an erroneous operation of the intake and/or exhaust valves is detected; otherwise an error-free operation of the intake and/or exhaust valves is detected. | 10-02-2008 |
20080283030 | METHOD TO DETERMINE A FUEL COMPOSITION - The invention concerns a method to determine the composition of a fuel from the components ethanol and gasoline of an internal combustion engine, wherein the fuel is supplied to the internal combustion engine by means of a fuel supply unit and via two fuel distributor rails; and the exhaust gas is discharged from the internal combustion engine by means of two exhaust gas manifolds of a first and a second exhaust gas system, which are separated from each other, wherein the first and second exhaust gas system have in each case at least one exhaust gas probe and wherein current changes in the ethanol content of the fuel are evaluated from the signal differences of lambda signals from the exhaust gas probes. With this method, a change in the ethanol content of the fuel can be detected, and an explicit condition for a change in fuel can be derived. Moreover, with the method, errors in the fuel-mixture can be distinguished from an altered fuel composition, which takes place after the tank has been filled (fueling). | 11-20-2008 |
20080295574 | METHOD FOR FUEL ANALYSIS - The invention concerns a method for the fuel analysis in an internal combustion engine, which can be operated with different fuels containing ethanol and gasoline in varying compositions, wherein the gasoline content is ascertained in the fuel. In so doing, it is possible for especially the cold starting characteristics of the internal combustion engine to be improved, because the enrichment of the fuel mixture, which is necessary to achieve this improvement, can be optimally adjusted according to the gasoline content in the fuel. | 12-04-2008 |
20080312785 | Method to detect a faulty operating condition during a cylinder cutoff of an internal combustion engine - Method to detect a faulty operating condition during a cylinder cutoff of an internal combustion engine with at least two cylinder banks, wherein the internal combustion engine comprises in each case a separate mechanism to determine the Lambda value of the combustion for each cylinder bank. | 12-18-2008 |
20090064977 | METHOD TO DETERMINE AN ALCOHOL CONTENT - The invention relates to a method to determine an alcohol content in the fuel of an internal combustion engine, in which the fuel is delivered to the individual cylinders of the internal combustion engine by way of a fuel supply via a fuel rail; and the exhaust gas of the internal combustion engine is discharged via an exhaust gas manifold of an exhaust gas system, wherein at least one exhaust gas probe is present, and in which current changes in the alcohol content of the fuel are evaluated from the signal flow of a lambda signal of the exhaust gas probe, and said signal results from a closed-loop lambda control. | 03-12-2009 |
20090070017 | METHOD TO DETERMINE A FUEL COMPOSITION - The invention deals with a method to determine the fuel composition of a fuel mixture from a first fuel and a second fuel for the operation of an internal combustion engine, wherein the first and the second fuel have different octane numbers and wherein the internal combustion engine has at least one knock sensor and a closed-loop knock control. Provision is made according to the invention for the composition of the fuel mixture to be determined by means of an output signal of the knock sensor. Provision is made in many cases for the knock sensor to already be in the internal combustion engine, so that it does not present any additional expenditure of money or effort. Because the octane number of the fuel mixture is determined by the mixing ratio of the fuels involved, which have different octane numbers, in retrospect the composition of the fuel mixture can be suggested from the signal of the knock sensor under suitable operating conditions. | 03-12-2009 |
20090133678 | METHOD FOR TAKING THE OUTGASSING OF FUEL FROM THE ENGINE OIL OF AN INTERNAL COMBUSTION ENGINE INTO ACCOUNT - 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 a result of different boiling curves of the components of the fuel blend, which cannot be completely taken into account by the map-based pilot control under all operating conditions of the internal combustion engine, can in this way be compensated. | 05-28-2009 |
20090192692 | Method and Device for Operating a Drive Unit - A method and a device are provided for operating a drive unit of a vehicle having an engine which in a first operating state is operated with a first number of cylinders and in a second operating state is operated with a second number of cylinders. The first number of cylinders and the second number of cylinders are different from one another. The switchover of the engine between the first operating state and the second operating state is adapted to the driver type or the driving situation. Switchover between the first operating state and the second operating state is delayed as a function of the driver type or the driving situation. | 07-30-2009 |
20090205609 | Method and Device for Operating an Internal Combustion Engine - A method and a device for operating an internal combustion engine are provided which make it possible to implement different deceleration requests to the internal combustion engine by switching over between half engine operation and full engine operation. A deceleration request is received particularly in a nonoperating state. A switchover is made between a first operating state and a second operating state of the internal combustion engine as a function of the magnitude of the deceleration request. The first operating state and the second operating state differ, in this instance, in the number of cylinders whose charge changing process is interrupted. | 08-20-2009 |
20090265078 | METHOD AND DEVICE FOR OPERATING AN INTERNAL COMBUSTION ENGINE AND INTERNAL COMBUSTION ENGINE - A method and a device for operating an internal combustion engine and an internal combustion engine are described, the fuel being injectable directly into a combustion chamber in particular via at least one first injector and also being injectable into an intake manifold in particular via at least one second injector. For injection of fuel in a full-load operating state of the internal combustion engine, a first selection is made from the at least one first injector and the at least one second injector having a first metering range, including a full-load injection quantity required for the full-load operating state. For injection of fuel in a partial-load operating state of the internal combustion engine, a second selection is made from the at least one first injector and the at least one second injector having a second metering range, including the adjustment of a minimum fuel injection quantity required for operating the internal combustion engine. The first selection and the second selection are made differently, in such a way that only the metering range of the first selection includes the full-load injection quantity and/or that only the metering range of the second selection covers the minimum fuel injection quantity required for operating the internal combustion engine. | 10-22-2009 |
20090281710 | METHOD AND DEVICE FOR OPERATING AN INTERNAL COMBUSTION ENGINE - A method and a device for operating an internal combustion engine to perform a lambda regulation without using a lambda sensor. Fuel is injected for combustion in a combustion chamber of the internal combustion engine. A first quantity of the internal combustion engine is ascertained, which allows a conclusion to be drawn about the behavior of an output quantity of the internal combustion engine, in particular of a torque. The method includes the following:
| 11-12-2009 |
20090319154 | Method and device for operating an internal combustion engine in the context of a combined direct and manifold injection, a computer program, a computer program product - In a control unit, a method, a computer program and a computer program product for operating an internal combustion engine in the context of a combined direct and manifold injection, fuel is injected by at least one first injection valve into an induction manifold and/or by at least one second injection valve directly into a combustion chamber for combustion. In at least one predefined operating state of the internal combustion engine, fuel is only injected by the at least one first injection valve into the induction manifold for a predetermined number of successive combustion cycles. In a subsequent combustion cycle, fuel is injected by the at least one first injection valve into the induction manifold and by the at least one second injection valve directly into the combustion chamber or only by the at least one second injection valve directly into the combustion chamber. | 12-24-2009 |
20100036580 | METHOD AND DEVICE FOR OPERATING AN INTERNAL COMBUSTION ENGINE - A method and a device are provided for operating an internal combustion engine which allow for an improved diagnosis of the valve mechanism of cylinders of the internal combustion engine. For this purpose, a variable characteristic of a suction performance of a cylinder of the internal combustion engine is ascertained. The variable characteristic of the suction performance is ascertained as a function of the mass flow flowing into an intake manifold of the internal combustion engine and of a change of the intake manifold pressure during an intake phase of the cylinder. | 02-11-2010 |
20100037852 | METHOD FOR INTRODUCING FUEL INTO A COMBUSTION CHAMBER OF AN INTERNAL COMBUSTION ENGINE - A method for introducing fuel into a combustion chamber of an internal combustion engine is provided, in which fuel is injected at variable metering directly into the combustion chamber by a first fuel injector on the one hand, and into an air aspiration channel leading to the combustion chamber by a second fuel injector on the other hand. To ensure a reliable cold start of the internal combustion engine when using regenerative fuels even at low temperatures, in the cold start of the internal combustion engine a partial quantity of the required overall fuel quantity is injected via the second fuel injector, this partial quantity being the particular fuel quantity that exceeds a maximum fuel quantity able to be injected via the first fuel injector. | 02-18-2010 |
20100198486 | METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE - The invention relates to a method for operating an internal combustion engine, which can be operated with fuels and fuel mixtures of said fuels, said fuels differing from each other in the air quantity they require for a stoichiometric combustion. A fuel quantity to be supplied to the internal combustion engine is corrected via a mixture adaptation and a fuel adaptation, the mixture adaptation and the fuel adaptation being based on a lambda control and a fuel quantity contained in the fuel reservoir of the internal combustion engine prior to refueling and a fuel quantity supplied to the reservoir being determined. The method is characterized by using the change of the fuel adaptation after refueling towards a fuel/air mixture having a higher or a lower fuel percentage to extrapolate the supplied fuel or the supplied fuel mixture and the fuel quantity present in the reservoir and the knowledge of the nature of the fuel or the fuel mixture supplied to the reservoir are used to calculate the fuel mixture ration in the reservoir after refueling. The method according to the invention allows determination of the fuel mixture ratio in the reservoir of internal combustion engines which can be operated with different fuels. | 08-05-2010 |
20120203411 | Method and Device for Adapting and/or Diagnosing an Internal Combustion Engine Situated in a Hybrid Vehicle - In a method for adapting and/or diagnosing an internal combustion engine which is situated in a hybrid vehicle and forms a drive unit with at least one secondary machine, a positive or negative drive torque is applied to the internal combustion engine by the secondary machine for setting various operating states of the internal combustion engine, and at least one operating parameter of the internal combustion engine is determined at a set operating point. | 08-09-2012 |
20140373813 | VENTING A FUEL TANK BY MEANS OF A FUEL SUPPLY PATH AND AN AIR SUPPLY PATH OF AN INTERNAL COMBUSTION ENGINE - The invention relates to a system ( | 12-25-2014 |