Patent application number | Description | Published |
20080279742 | Method and Device For Desulfating a NOx Storage Catalyst - The desulfation of a NOx storage catalytic converter takes place in two phases. In a first phase, the NOx storage catalytic converter is alternately exposed to rich and lean exhaust gas. In a subsequent second phase, the NOx storage catalytic converter is operated using rich exhaust gas. This method permits the quantity of hydrogen sulfide that occurs during the desulfation process to be minimized and achieves at the same time an efficient removal of sulfate from the deep-seated layers of the NOx storage catalytic converter. | 11-13-2008 |
20080307852 | Method and Device for the Calibration of an Exhaust Gas Probe, and Method and Device for the Operation of an Internal Combustion Engine - A plateau phase of a test signal of an exhaust gas probe located in a catalytic converter is detected following a jump from a preset rich air/fuel ratio in a combustion chamber of one cylinder to a preset lean air/fuel ratio, the plateau phase being obtained following the jump, and the duration is determined as a storage period. A plateau phase of the test signal, which is obtained following a jump from a preset lean air/fuel ratio to a preset rich air/fuel ratio, is detected following the jump, and the duration of the plateau phase is determined as an evacuation period. An allocation rule for assigning the test signal to a detected air/fuel ratio is adjusted according to the storage period and the evacuation period. To calibrate the exhaust gas probe, the allocation rule is adapted according to a plateau value of the test signal during the plateau phase. | 12-18-2008 |
20080314023 | Method for Determining Current Oxygen Loading of a 3-Way Catalytic Converter of a Lambda-Controlled Internal Combustion Engine - The invention relates to a method for determining the actual oxygen load of a 3-path catalyst of a lambda-controlled internal combustion engine, whereby a value for the actual oxygen load is calculated from the signal of a pre-catalyst lambda probe and the measured air mass flow rate by integration over time, whereby the post-catalyst lambda probe is initialized when the signal is interrupted. | 12-25-2008 |
20090012671 | Method and Device for Operating an Internal Combustion Engine - During a first driving cycle, a combustion process is controlled in at least one combustion chamber for the purpose of performing a check on an emission reduction system of an internal combustion engine. During a second driving cycle following the first cycle, a check is performed to establish whether an error in the emission reduction system was detected during the first cycle. An idle time between the first and the second cycles is determined, in the event of an error of the emission reduction system detected during the first cycle. During the second cycle, the combustion process in the at least one combustion chamber is only controlled for the purpose of the check on the emission reduction system, in the event of an error detected in the emission reduction system during the first cycle and in the event of the idle time being longer than a pre-determined repair time. | 01-08-2009 |
20090038595 | Method and Device for Operating an Internal Combustion Engine - An internal combustion engine has at least one cylinder and an exhaust gas tract, in which an exhaust gas sensor, that can be heated in a controlled manner, is arranged. An exhaust gas temperature of an exhaust gas flowing in the exhaust gas tract is determined as a function of the heating power (P_HEAT) supplied to the exhaust gas sensor. An estimated value of the exhaust gas temperature is determined as a function of a physical model of the combustion of the air/fuel mixture and of the exhaust gas tract as a function of at least one operating variable of the internal combustion engine, but independent of the heating power supplied to the exhaust gas sensor. Model parameters of the physical model are adapted as a function of a deviation of the estimated value and of the exhaust gas temperature determined by the supplied heating power. | 02-12-2009 |
20090077951 | Method and Device for Operating an Internal Combustion Engine - An internal combustion engine has a NOX storage catalyst. A storage capacity (NOX_STC) of the NOX storage catalyst is determined for the purpose of operating the internal combustion engine. The temperature (TEMP) of the NOX storage catalyst is increased if the storage capacity (NOX_STC) is less than a predefined threshold value. | 03-26-2009 |
20090088943 | Method for Regulating the Lambda Value of an Internal Combustion Engine - The invention relates to a method for regulating the lambda value of an internal combustion engine with a catalytic converter for subsequently treating the exhaust gases of the internal combustion engine, with a binary lambda probe, which is mounted upstream from the catalytic converter and which senses the composition of the exhaust gases. According to the invention, the lambda set value is superimposed with a lean/rich amplitude. This lean/rich amplitude has an integral component and a discontinuous component leading back to the lambda set value. When a change that differs from the change in the exhaust gas composition caused by the lean/rich amplitude is detected, the coefficient of the integral component is modified and/or a discontinuous component is added to the integral component or subtracted therefrom. | 04-02-2009 |
20090088949 | Method for Operating an Internal Combustion Engine - In a method for operating an internal combustion engine with a crankcase breather venting into an intake tract, operating parameters of the internal combustion engine are measured | 04-02-2009 |
20090095049 | METHOD FOR CORRECTING THE OUTPUT SIGNAL OF A LAMBDA PROBE - In a method for correcting the output signal of a broadband lambda probe of an internal combustion engine, the influence of the air humidity on the lambda value determined by the broadband lambda probe is detected and is deducted by means of a compensation model. For this purpose, a measured air humidity is incorporated in the calibration of the broadband lambda probe during an overrun shut-off phase of the internal combustion engine. | 04-16-2009 |
20090100922 | METHOD AND CONTROL APPARATUS FOR EVALUATING AN EXHAUST GAS PROBE - In a method and a control apparatus for monitoring an exhaust gas probe, the exhaust gas probe is arranged in an exhaust gas channel. The exhaust gas channel is connected to an internal combustion engine, with the internal combustion engine being supplied with a rich or lean air/fuel ratio in an oscillating fashion. An amplitude of a signal based on the oscillating output signal of the exhaust gas probe is determined and used to evaluate the exhaust gas probe. | 04-23-2009 |
20100037592 | METHOD AND DEVICE FOR DIAGNOSING AN EXHAUST GAS CATALYTIC CONVERTER - A first exhaust gas sensor signal (vls_up) of a first exhaust gas sensor (AS | 02-18-2010 |
20100037676 | METHOD AND DEVICE FOR ESTIMATING AN EMISSION OF AT LEAST ONE EXHAUST GAS COMPONENT - An exhaust-gas sensor signal (vls_down) of an exhaust-gas sensor that is disposed in an exhaust gas train downstream of at least one first catalytic converter volume (V | 02-18-2010 |
20100089033 | DIAGNOSTIC METHOD AND DEVICE FOR OPERATING AN INTERNAL COMBUSTION ENGINE - An internal combustion engine has an exhaust gas catalyst, a first exhaust gas sensor that is arranged in such a manner that it can be used in lambda control, and a second exhaust gas sensor that is arranged in such a manner that it can be used in trim control. A HC quality value (EFF_CAT_HC) which is representative of an oxygen storage capacity of the exhaust gas catalyst is determined depending on a measuring signal (VLS_DOWN) of the second exhaust gas sensor. A NOx correction factor (COR_NOX) is determined depending on the measuring signal (VLS_DOWN) of the second exhaust gas sensor, namely depending on signal portions that are representative of the residual oxygen. A NOx quality value (EFF_CAT_DIAL_NOX) is determined depending on the HC quality value (EFF_CAT_HC) and the NOx correction factor (COR_NOX). | 04-15-2010 |
20100126253 | METHOD FOR DETERMINING THE ALCOHOL CONCENTRATION OF FUEL THAT CAN BE FED TO COMBUSTION IN A MOTOR VEHICLE - In the method for determining the alcohol concentration of the tank fuel after filling up with E85 fuel or E0 fuel, two corridors of possible lambda values for filling with E0 fuel and E85 are established according to the volumes of the tank fuel before and after filling, and the lambda values are taken into account in the evaluation. | 05-27-2010 |
20100139269 | TURBOCHARGED INTERNAL COMBUSTION ENGINE AND METHOD - A turbochargeable internal combustion engine contains a motor which has an exhaust manifold on the exhaust gas side, a turbocharger which has at least two turbocharger stages and, on the exhaust gas side, has an exhaust gas inlet and an exhaust gas outlet. The engine further has a primary catalytic converter, which is arranged on the exhaust gas side between the exhaust manifold of the engine block and the exhaust gas inlet of the turbocharger. | 06-10-2010 |
20100186371 | Method for Operating an Exhaust-Gas Catalytic Converter of an Internal Combustion Engine - Method and apparatus for operating an exhaust-gas catalytic converter ( | 07-29-2010 |
20100326053 | METHOD AND DEVICE FOR OPERATING AN INTERNAL COMBUSTION ENGINE - An internal combustion engine with multiple cylinders and injection valves that are provided for the cylinders and that meter fuel also comprises an exhaust gas tract in which an exhaust gas catalytic converter is arranged. A characteristic value (OSC) of an oxygen storage capacity of the exhaust gas catalytic converter is determined. In accordance with the characteristic value (OSC), a heating measure (HM) for heating the exhaust gas catalytic converter is carried out. | 12-30-2010 |
20110041819 | METHOD AND APPARATUS FOR OPERATING AN INTERNAL COMBUSTION ENGINE - An internal combustion engine has at least one cylinder, with which an injection valve for metering fuel is associated and an exhaust system with an exhaust gas catalytic converter. A first exhaust gas probe is disposed upstream of or in the exhaust gas catalytic converter, and a second exhaust gas probe is downstream. A lambda controller determines a regulating variable as a function of the first probe and a control variable acting on a fuel mass to be metered using the injection valve. A trim regulator determines a regulating variable thereof as a function of the second probe and the first trim control variable thereof as a function of a P regulator component and the second trim control variable thereof as a function of an I regulator component. A function of a predetermined evaluation of the first trim control variable decides whether the second trim control variable is adapted. | 02-24-2011 |
20130073188 | Determining the Closing Point in Time of an Injection Valve on the Basis of an Analysis of the Actuation Voltage Using an Adapted Reference Voltage Signal - A method for determining a closing time of a valve having a coil drive may include switching off a current flow through a coil of the coil drive so that the coil is depowered, measuring a time curve of a voltage induced in the non-powered coil, wherein the induced voltage is generated at least partially by a motion of the armature relative to the coil, evaluating the measured time curve of the voltage induced in the coil, wherein the evaluation comprises comparing the measured time curve of the voltage induced in the depowered coil to a reference voltage curve stored in an engine controller, and determining the closing time based on the evaluated time curve. The reference voltage curve is thereby adapted to current operating conditions of the valve. A corresponding device and computer program for determining the closing time of a valve comprising a coil drive are also disclosed. | 03-21-2013 |
20130197837 | Ascertaining the Ballistic Trajectory of an Electromagnetically Driven Armature of a Coil Actuator - A method for determining the movement time curve of an electromagnetically driven armature of an actuator that has a coil may include: (a) applying to the coil a control signal dimensioned such that the armature undergoes only a partial deviation from the armature starting position without reaching an end position defined by a stop, and reaches, the armature starting position again after reaching a turnaround position, wherein the deviation of the armature over time is described at least approximately by a section of a parabola at least between the turnaround position and the starting position, (b) determining the time at which the armature reaches the armature starting position again, (c) determining the speed with which the armature reaches the armature starting position again, and (d) ascertaining the movement time curve of the armature using a mathematical equation that describes the parabola based on the detected time and the detected speed. | 08-01-2013 |
20130253804 | Estimating a Fuel Leakage Quantity of an Injection Valve During a Shut-Down Time of a Motor Vehicle - A method is disclosed for estimating a fuel leakage quantity which enters from a leaking injection valve during a shut-down time of a motor vehicle into an intake tract or into a cylinder of an internal combustion engine of the motor vehicle and is added to a fuel mixture to be combusted during a starting process. The method may include: measuring a first start index characteristic of a starting behavior of the engine during a first starting process; determining a first injected fuel quantity during the first starting process; measuring a second start index characteristic of a starting behavior of the engine during a second starting process; determining a second injected fuel quantity during the second starting process; and estimating the fuel leakage quantity based on the measured first start index, the determined first injected fuel quantity, the measured second start index and the determined second injected fuel quantity. | 09-26-2013 |
20140092516 | Modified Electrical Actuation Of An Actuator For Determining The Time At Which An Armature Strikes A Stop - A method is disclosed for operating an actuator having a coil and a displaceably mounted armature driven by a magnetic field generated by the coil, in a measurement operating mode for ascertaining a time at which the armature reaches its stop position after activation of the actuator. The method includes applying to the coil an actuation voltage signal dimensioned such that the expected armature stop time falls in a time window in which a temporally constant voltage is applied to the coil, detecting an intensity profile of the current flowing through the coil within the time window, and determining the armature stop time, based on an evaluation of the detected current intensity profile. A method for operating such an actuator is also disclosed, wherein information about the stop time is obtained in a measurement operating mode and used in a series operating mode for optimized actuation of the actuator. | 04-03-2014 |
20140345571 | Determining the Opening Behavior of a Fuel Injector by Means of an Electrical Test Excitation Without Magnetic Saturation - A method for determining an opening behavior of a combustion engine fuel injector having a coil drive includes: applying to a coil of the coil drive an electrical test excitation that is weaker than an electrical standard excitation applied to the coil during normal operation of the engine, such that an opening position of the fuel injector is achieved at a point at which the coil drive is not in magnetic saturation; measuring the chronological progression of an electrical variable of the coil; determining a first point in time at which the fuel injector reaches its opening position under the influence of the electrical test excitation, based on the measured chronological progression of the electrical variable, and determining a second point in time at which the fuel injector would reach its opening position under the influence of the electrical standard excitation, based on the determined first point in time. | 11-27-2014 |