Patent application number | Description | Published |
20090132148 | METHOD AND DEVICE FOR DETERMINING THE AMBIENT PRESSURE BY MEANS OF A CHARGE PRESSURE SENSOR IN A TURBOCHARGED ENGINE - In turbocharged engines, there is the problem that, in particular under load, the ambient pressure (AMP) cannot be determined directly from the measurement values of a charge-pressure sensor ( | 05-21-2009 |
20090157280 | METHOD AND DEVICE FOR OPERATING AN INTERNAL COMBUSTION ENGINE - In a method and device for operating an internal combustion engine with an intake tract, a switching device for modifying an effective intake pipe length and/or an effective intake tract volume is arranged. By a dynamic intake tract model an estimated intake pipe pressure is determined. The dynamic model is adapted dependent on a trimming value. If a switching position modification is controlled, an estimated old position intake pipe pressure on the one hand is determined with the previous switching position and preventing of the adaptive trimming value adjustment and on the other hand an estimated new position intake pipe pressure is determined with the modified switching position and prevention of the adaptive trimming value adjustment and dependent on a correlation check of the estimated old position pressure and the estimated new position pressure with respect to the measured pressure an actual switching position of the switching device is identified. | 06-18-2009 |
20100146966 | DIAGNOSTIC METHOD AND DEVICE FOR DIAGNOSING AN INTAKE SYSTEM OF AN INTERNAL COMBUSTION ENGINE - An internal combustion engine has an intake system ( | 06-17-2010 |
20100152992 | METHOD FOR OPERATING A FORCED-INDUCTION INTERNAL COMBUSTION ENGINE - The precision of an intake manifold model for a supercharged internal combustion engine can be improved, wherein a first pressure value in the inlet tract ( | 06-17-2010 |
20100185379 | METHOD AND DEVICE FOR OPERATING AN INTERNAL COMBUSTION ENGINE - Actual values of a load variable are detected by a sensor during active model trimming under different valve pressure conditions, and a model of estimated values is created. Trimming values of a model parameter are determined depending on detected and modeled values such that when the model parameter is trimmed, the modeled values approximate the detected values. A function is determined depending on the different pressure conditions and approximated to the trimming values. At different pressure conditions first lambda control values are detected. A first controller value fitted function is determined depending on the pressure conditions and approximated. When the model trimming mode is not active, second lambda control values are detected at different pressure conditions. A second controller value fitted function is determined depending on the pressure conditions and is approximated. An error of the intake system is detected depending on the fitted functions. | 07-22-2010 |
20110010072 | METHOD AND DEVICE FOR THE OPERATION OF AN INTERNAL COMBUSTION ENGINE COMPRISING AN EXHAUST-GAS TURBOCHARGER - In order to operate an internal combustion engine with a turbocharger, a boost pressure prevailing downstream of a compressor ( | 01-13-2011 |
20110067678 | METHOD AND DEVICE FOR OPERATING AN INTERNAL COMBUSTION ENGINE AND AN INTERNAL COMBUSTION ENGINE - An internal combustion engine has an air intake system with an air intake pipe and which communicates with a combustion chamber of a cylinder as a function of a switch position of a gas inlet valve. Furthermore, a compressor is disposed in the air intake system and is embodied for the purpose of compressing a mass air flow. Also, a throttle valve is disposed in the air intake system downstream of the compressor and by which the compressed mass air flow into the air intake pipe can be throttled. The internal combustion engine furthermore has a differential pressure sensor which is disposed in the air intake system and is embodied for the purpose of measuring a differential pressure between a charge pressure that prevails downstream of the compressor and upstream of the throttle valve and an ambient pressure that prevails outside of the air intake system. | 03-24-2011 |
20110071749 | METHOD AND DEVICE FOR OPERATING AN INTERNAL COMBUSTION ENGINE - In an internal combustion engine, at a first operating point using no exhaust gas recirculation, a first measured value of a load variable is detected. As a function of a further operating variable, a first model value of the load variable is determined using a suction pipe model. At least one parameter of the suction pipe model is adapted such that the first model value approaches or corresponds to the first measured value. A first value of the parameter adjustment is stored. At a second operating point, using exhaust gas recirculation a second value corresponding to the first value of the parameter adjustment, is determined and stored. The first and second values of the parameter adjustment are compared and a parameter value of an exhaust gas recirculation model is adapted such that the first and the second values of the parameter adjustment approach each other or correspond to each other. | 03-24-2011 |
20110098876 | METHOD AND DEVICE FOR DIAGNOSING AN INTAKE TRACT OF AN INTERNAL COMBUSTION ENGINE - An internal combustion engine has an intake tract having a compressor. A verification is performed as to whether at least one predefined activation condition is met. A boost pressure (PUT) downstream of the compressor is sensed or determined. An adaptation characteristic curve or adaptation characteristic map (KF_AD) is adapted as a function of a rotational speed (N) of the internal combustion engine and the boost pressure (PUT) if the at least one actuation condition is met. A gradient is determined that is representative of a gradient of the adaptation characteristic curve or adaptation map (KF_AD). From the determined gradient, conclusions are drawn with respect to a fault in the intake tract of the internal combustion engine. | 04-28-2011 |
20130327040 | Checking An Exhaust Gas Flap - A method is disclosed for checking a valve on an exhaust gas turbocharger of an internal combustion engine, wherein an exhaust gas flow exits the internal combustion engine, a first portion of said flow flowing through a turbine of the exhaust gas turbocharger into an exhaust gas system and a second portion flowing through the valve into the exhaust gas system, wherein said method includes the steps of varying a fuel-to-air ratio in a fresh gas supplied to the internal combustion engine, determining a residual oxygen content in the exhaust gas system, and determining that the valve is defective if a variation of the residual oxygen content occurs in a manner different than a predetermined manner of the variation of the fuel-to-air ratio in the fresh gas. A device for checking the valve can be integrated into an integrated engine control unit of the internal combustion engine. | 12-12-2013 |