| Patent application number | Description | Published |
|---|
| 20080196488 | Method and Device for Determining the Ratio Between the Fuel Mass Burned in a Cylinder of an Internal Combustion Engine and the Fuel Mass Supplied to the Cylinder - The isentropic exponent (χ) and the constant (k) in the equation p·V | 08-21-2008 |
| 20090088983 | METHOD AND DEVICE FOR DETERMINING THE COMPOSITION OF A GAS MIXTURE OF A FUEL TANK OF A MOTOR VEHICLE FILLED WITH CNG - In a process and device for determining the composition of a gas mixture of the fuel tank of a motor vehicle filled with a CNG gas, the measured values of a pressure sensor and a temperature sensor, which are generally present in conventional fueled motor vehicles, are used to determine the vapor pressure (pd) of at least one of the gases in the gas mixture, in particular ethane, propane and/or butane. If the vapor pressure of one of the components of the CNG gas in the fuel tank falls short, then one relevant, current composition of the gas mixture is determined. This offers the advantage in an internal combustion engine that as much gas can always be injected with the 20 requisite energy value, as is called for by the specified air-fuel ratio (λ-value) and the conditions of operation. This achieves optimum combustion with minimal exhaust. | 04-02-2009 |
| 20090095256 | Method and device for controlling an internal combustion engine - In order to control an internal combustion engine according to the invention, a polytropic exponent is determined in accordance with at least two measured values of the pressure in the combustion chamber of the cylinder, said measured values being detected after closing the gas discharge valve and before successively opening the gas intake valve. An exhaust gas mass which is located in the cylinder after closing the gas discharge valve and before successively opening the gas intake valve is determined according to the polytropic exponent at an estimated value of the pressure after closing the gas discharge valve and before successively opening the gas intake valve as well as at a certain temperature of the exhaust gas located in the cylinder after closing the gas discharge valve and before successively opening the gas intake valve. An actuation signal for controlling an actuating member of the internal combustion engine is generated in accordance with the determined exhaust gas mass. | 04-16-2009 |
| 20090138180 | METHOD FOR THE DIRECT RE-ENTRY IN THE CAI OPERATING MODE OF AN INTERNAL COMBUSTION ENGINE FOLLOWING A PULL FUEL CUT OFF PHASE AS WELL AS A PERTINENT CONTROL UNIT - For the direct re-entry in the CAI operating mode following a pull fuel cut off phase the CAI specific valve lift is maintained during its pull fuel cut off phase. Upon a request signal for the CAI re-entry after the closing time of the particular cylinder, an advance fuel injection quantity is injected in the combustion chamber and externally ignited and combusted in the following CAI interim compression phase of the exhaust stroke, as a result of which hot exhaust gas is formed in the combustion chamber, fresh air is drawn into the combustion chamber during the following intake stroke, a main fuel injection quantity is injected in a main compression phase during the following compression stroke, and the exhaust gas content brought about from the earlier auxiliary fuel injection, is mixed with the air-fuel mixture newly introduced for the main ignition to form a self-ignitable, homogenous fresh air-exhaust gas-fuel mixture. | 05-28-2009 |
| 20090150053 | METHOD FOR ASCERTAINING THE GAS WORK PERFORMED BY THE CYLINDER PRESSURE ON THE PISTON OF A CYLINDER AND THE INTERNAL MEAN PRESSURE - To determine the gas work W | 06-11-2009 |
| 20090182491 | METHOD AND SYSTEM FOR FILTERING A DISTURBED CYLINDER PRESSURE SIGNAL FROM A CYLINDER IN AN INTERNAL COMBUSTION ENGINE - For at least one disturbance variable of the cylinder pressure signal, which disturbance variable occurs only during specific limited time spans as the pressure profile of an operating cycle, a filter tuned to the type of disturbance variable is fixed and is assigned to the corresponding disturbance variable time window or windows ( | 07-16-2009 |
| 20090287389 | Method For Increasing The Resolution Of Output Signals From At Least One Measuring Sensor On An Internal Combustion Engine And Corresponding Controller - The resolution of output signals from at least one measuring sensor on an internal combustion engine can be increased by: the working level range of the sensor is divided into at least two range sections, each section is provided with the same given output level range limited with relation to the working level range, for the output signal from the sensor and the switching from one to the other section is carried out independently by the sensor, when a range boundary between two adjacent sections is reached, exceeded or fallen below, the operating point of the internal combustion engine is determined by an engine management based on at least one parameter, the time curve for the raw sensor signal is predicted from at least one set of performance characteristics for the current operating point and the engine management determines which section is current from the predicted raw sensor signal time curve. | 11-19-2009 |
| 20100262355 | METHOD AND DEVICE FOR EXAMINING A VALVE LIFT SWITCHING PROCESS - In a method and a device for examining a valve lift switching process in a motor vehicle the occurrence or the number of switching errors is reduced. The method has the steps of detecting whether a switching error and/or an external event occurs that may influence the mode of operation of the valve lift switching; blocking the valve lift switching if a switching error and/or an external event has occurred; activating and examining the valve lift switching during at least one uncritical operating condition; releasing the valve lift switching if the valve lift switching does not show any abnormalities during monitoring. | 10-14-2010 |
| 20110047967 | METHOD FOR AN EMISSION-OPTIMIZED TRANSFER FROM A MODE OF AN INTERNAL COMBUSTION ENGINE TO ANOTHER MODE - In a method for an emission-optimized transition between a spark-ignition mode of an internal combustion engine and a self-ignition mode of the internal combustion engine, the internal combustion engine is operated in the preparation phase and chronologically before the transition of modes in a spark-ignition mode in at least one cylinder cycle with a rich mixture (λ<1) and, subsequently, in the same cylinder cycle with a lean mixture (λ<1). After that, the internal combustion engine is operated in the self-ignition mode. In a method for an emission-optimized transition between a self-ignition mode of an internal combustion engine and a spark-ignition mode of the internal combustion engine, in a transition phase of the operation modes and during a last cycle of the self-ignition mode and/or a first cycle of the spark-ignition mode, fuel is post-injected into at least one combustion chamber of the internal combustion engine. | 03-03-2011 |
