| Patent application number | Description | Published |
|---|
| 20080245057 | Method for the diagnosis of a three-way-catalytic converter for an internal combustion engine - A method for the diagnosis of a three-way catalytic converter for an internal combustion engine using the voltage signal of a downstream binary lambda sensor proposes that with a changeover of the air/fuel ratio λ that is fed to the internal combustion engine from high to low, the voltage signal U | 10-09-2008 |
| 20080282787 | Method for diagnosing a storage-capable catalytic converter for exhaust aftertreatment in an internal combustion engine - In a method for diagnosing a storage-capable catalytic converter of an internal combustion engine which is supplied with sufficiently hot exhaust gas so that its temperature is above the starting temperature of the exhaust gas, it is proposed that the catalytic converter is briefly supplied with cooler exhaust gas so that a cold wave passing through it forms, that the axial position of the cold wave within the catalytic converter is computed, and that the size of the storage unit is determined from the signal of an exhaust gas probe connected downstream from the catalytic converter relative to the axial position of the cold wave. According to the invention, a differentiated diagnosis method is made available by which not only the axial position or the region of damage of the storage unit can be determined, but by which the reduction of conversion of a certain pollutant A,B caused by the axial position of the damage can be indicated. | 11-20-2008 |
| 20080319634 | Method for Determining a Correction Value for the Lambda Center Position in the Control of an Internal Combustion Engine - In a method for determining a correction value λk for the lambda center position λm which is specified in the control of the air/fuel ratio which is force-modulated between a first lean lambda value λ | 12-25-2008 |
| 20090235726 | METHOD FOR DETERMINING THE OXYGEN STORAGE CAPACITY OF A CATALYTIC CONVERTER FOR A MOTOR VEHICLE AS WELL AS AN ASSOCIATED MEASURING DEVICE - Method for determining the oxygen storage capacity of a catalytic converter for a motor vehicle using the signals of an oxygen probe upstream and an oxygen probe downstream from the catalytic converter which has the following steps of determining of a delay time which is dependent on the oxygen storage capacity between the signal of the oxygen probe upstream and the signal of the oxygen probe downstream from the catalytic converter, determining of the phase shift which is dependent on the oxygen probe dynamics between the signal of the oxygen probe upstream and the signal of the oxygen probe downstream from the catalytic converter, and correcting the determined delay time between the signal of the oxygen probe upstream and the signal of the oxygen probe downstream from the catalytic converter by a determined phase shift. | 09-24-2009 |
| 20090282891 | Method for Diagnosing the Reliability Performance of a Jump Probe - In a change from a lean to a rich exhaust gas mixture, a characteristic behavior appeal's in a short time interval in the vicinity of the lambda jump of an upstream catalytic converter lambda probe in the signal characteristic which is measured by a downstream catalytic converter lambda probe. From the signals in small intervals, around the instant of changing, the reliability performance of the downstream lambda probe can be deduced without the actual probe jump in curves of the voltage characteristics having to be considered. | 11-19-2009 |
| 20110056269 | Method for Determining the Oxygen Storage Capacity - During the measurement of the oxygen storage capacity of an oxygen storage system, which is assigned to a catalytic converter, a switchover operation from lean to rich exhaust gas or vice versa is effected. The measurement signals of a lambda probe are recorded; and an integral calculation is carried out over a time interval on the basis of the measurement values. Whereas in the past the start of the time interval was the point in time of the switchover operation, the present invention provides that the start of the second time interval is determined on the basis of the measurement signals of the second lambda probe i.e., the point in time is preferably fixed at the time at which these measurement values reach an extreme value. This design allows the oxygen storage capacity to be measured even if the lambda probe is not fully functioning totally correctly. | 03-10-2011 |
| 20110056279 | Method for Checking a Catalytic Converter Oxygen Storage Reservoir for Sufficient Storage Capacity - Four cases are to be distinguished from one another for an exhaust gas line of a motor vehicle with an oxygen storage reservoir and a lambda probe located downstream from at least part of the oxygen storage reservoir, specifically in each case, whether or not the oxygen storage reservoir has sufficient storage capacity and whether or not the lambda probe is fully serviceable. For this purpose, the exhaust gas line is supplied in an alternating sequence with rich and lean exhaust gas, in two different passes the degree of oxygen filling being varied differently. For a minor variation of the degree of oxygen filling, the serviceability of the lambda probe can be deduced on the basis of certain criteria. If the lambda probe is fully serviceable, the sufficiency or insufficiency of the oxygen storage capacity of the oxygen storage reservoir can be deduced for a greater variation of the degree of oxygen filling. | 03-10-2011 |
| 20110077908 | Method for Diagnosing the Functional Reliability of a Lambda Probe - In the change from lean to rich exhaust gas or vice versa, signals are recorded by a lambda probe and are used to diagnose the functional reliability of this lambda probe So that special reliability of this procedure is ensured, the change is triggered by an event. The event can be defined by signals of the lambda probe or can be caused by control actions of the operator in the motor vehicle. | 03-31-2011 |
| 20110138778 | METHOD FOR OPERATING AN INTERNAL COMBUSTION ENGINE OF A MOTOR VEHICLE - The invention relates to a method that is intended for operating an internal combustion engine of a motor vehicle and that flushes the temporarily unused injection valves with fuel for the purpose of preventing and/or removing deposits. In order to make possible in a simple way a complete conversion of the undesired exhaust gas constituents in a catalytic converter of an exhaust gas aftertreatment system of the internal combustion engine when the internal combustion engine is running, the invention proposes flushing the temporarily unused injection valves with fuel during an overrun mode of the internal combustion engine. | 06-16-2011 |
