Patent application number | Description | Published |
20090173557 | DEFINED INTERNAL COMBUSTION ENGINE OPERATION IN VEHICLES HAVING A HYBRID DRIVE - A method for setting operating states of an internal combustion engine, in particular an internal combustion engine of a hybrid drive. In addition to the internal combustion engine, the hybrid drive includes at least one electric drive, a hybrid coordinator and a control unit assigned to the internal combustion engine in which functions are implemented. The functions request operating states favorable to their running ability from the hybrid coordinator which performs a commensurate modification of the distribution of power between the internal combustion engine and the at least one electric drive. | 07-09-2009 |
20090260429 | PROCEDURE AND DEVICE FOR DIAGNOSING THE DYNAMIC OF AN EXHAUST GAS SENSOR - The invention concerns a procedure and a device for diagnosing the dynamic of an exhaust gas sensor, which is arranged in an exhaust gas duct of a combustion engine and with which a parameter of the gas mixture that is supplied to the combustion engine is regulated by a control loop. It is thereby provided according to the invention that during a diagnosing period a temporal deflection of a regulation correcting variable for the parameter that is derived from an output signal of the exhaust gas sensor or a temporal course of the output signal of the exhaust gas sensor is used for the diagnosis and that the dynamic of the exhaust gas sensor is assumed in an evaluation algorithm. Thereby an improvement of the on-board diagnosis of the dynamic of the exhaust gas sensor can be achieved and in particular lambda probes, which provide a slowing down of their responding behavior, can be detected early on. | 10-22-2009 |
20100083743 | PROCEDURE AND DEVICE FOR DIAGNOSING AN EXHAUST GAS PROBE - The invention relates to a procedure and a device for diagnosing the increasing speed and the dead time of an exhaust gas probe, which is arranged in the exhaust gas duct of a combustion engine, whereby the diagnosis is carried out due to a comparison of a modeled and a measured signal after a default change of a fuel air ratio of an air fuel mixture that is supplied to the combustion engine and whereby the signal is an output signal of the exhaust gas probe or a modeled or measured signal that is derived from the output signal. It is thereby provided that a first extreme value is determined in the course of the modeled signal and that a first point of time and a first starting value are determined if the modeled signal deviates by a default amount from the first extreme value, that a second extreme value in the course of the measured signal is determined and that a second point of time and a second starting value are determined, if the measured signal deviates from the second extreme value by a pre-determined amount, that a first integral is created over a pre-determined period of time, beginning at the first point of time above the different between the first starting value and the modeled signal and that a second integral is created over a second period of time, beginning at the second point of time, above the difference between the second starting value and the measured signal, that the second period of time is equal to the pre-determined period of time or that the end of the second period of time related to the point of time of the change of the fuel air ratio or related to a first point of time is determined and that from a quantitative comparison between the first integral and the second integral a quantitative comparative value is created, which indicates the increasing speed and/or the dead time of the exhaust gas probe. The procedure and the device enable a secure diagnosis of the increasing speed and the dead time of exhaust gas probes in the exhaust gas of combustion engines depending on the changing direction of the fuel air ratio that is supplied to the combustion engine. | 04-08-2010 |
20100107728 | PROCEDURE AND DEVICE FOR DETECTING MANIPULATIONS AT LAMBDA PROBES - A procedure for detecting manipulations at lambda comprises the following steps; the lambda probe is excited by at least one electric excitation signal; at least one electric response signal of the probe is detected; the at least one response signal is compared to at least one default electric response signal that characterizes a not manipulated probe; the deviation of the detected at least one electric response signal from the at least one default electric response signal is used for detecting a manipulation of the probe. A device for detecting manipulations at lambda probes characterized by a switch assembly, with which the probe can be impinged with an electric excitation signal, in particular a step-wise electric excitation, preferably with a current impulse, by a evaluation switch device for evaluating a response signal, in particular the probe voltage and for comparing the excitation signal with the response signal and for assuming a manipulation in the case of a deviation of the response signal from a response signal that characterizes a not manipulated probe. | 05-06-2010 |
20100212291 | METHOD AND DEVICE FOR REGULATING THE FUEL/AIR RATIO OF A COMBUSTION PROCESS - A method for regulating the fuel/air ratio of a combustion process which is operated alternatingly with excess air and air deficiency, and having at least one catalyst volume in the exhaust gas of the combustion process which stores oxygen when there is excess oxygen in the exhaust gas and gives it off when there is oxygen deficiency, in which method the oxygen charges into the catalyst volume taking place when there is excess air, and the oxygen discharges from the catalyst volume taking place when there is air deficiency determined, and in which the fuel/air ratio is regulated in a first control loop such that the sum of the oxygen charges and oxygen discharges determined in a predefined interval takes on a predetermined value, wherein the combustion process is operated using oxygen excess or oxygen deficiency, respectively, at least until these appear at an oxygen-sensitive Nernst probe downstream from the catalyst volume. | 08-26-2010 |
20110082622 | METHOD AND DEVICE FOR DIAGNOSING THE DYNAMICS OF AN EXHAUST GAS SENSOR - The invention relates to a method for diagnosing the dynamics of an exhaust gas sensor embodied as a lambda probe, which is disposed in an exhaust gas duct of an internal combustion engine in the direction of flow of the exhaust gas upstream or downstream of a catalytic converter and with which the air/fuel ratio of the gas mixture supplied to the internal combustion engine is controlled via a control circuit. During the diagnosis, provision is made in the method according to the invention for at least one actuator intervention to be specified by means of a control algorithm of a diagnostic controller specifically in the direction of an asymmetric behavior, which is achieved by an extension of one of the two ramps, until the actuator intervention is compensated by a possible asymmetric dynamic error of the exhaust gas sensor, a reaction to said actuator intervention being used as the criterion for assessing an asymmetric dynamic error of said exhaust gas sensor. The device for carrying out the method provides that a diagnostic device, which is connected to the exhaust gas sensor, includes a diagnostic controller, with which during the diagnosis at least one actuator intervention can be specified specifically in the direction of an asymmetric behavior and the presence, respectively the extent, of the asymmetric dynamic error of said exhaust gas sensor can be detected from the measurement of the intervention when said intervention is being compensated due to a possible asymmetric dynamic error of said exhaust gas sensor. Even small asymmetric dynamic errors of the exhaust gas sensor, which can be embodied as a two point or as a wideband lambda probe, can especially be quickly and reliably detected with the method and the device for carrying out said method; thus contributing to improved on-board diagnostics. | 04-07-2011 |
20110314892 | METHOD AND DEVICE FOR THE DYNAMIC MONITORING OF A LAMBDA PROBE - A method for the dynamic monitoring of a first lambda probe arranged in an exhaust-gas duct of an internal combustion engine upstream of an exhaust-gas purification system. A period of an output signal of the first lambda probe is determined in a controller of the internal combustion engine, and a lambda regulating signal is determined from an output signal of a second lambda probe connected downstream of the exhaust-gas purification system. A first threshold value for a lengthening of the period of the output signal of the first lambda probe is predefined, in that a characteristic signal ( | 12-29-2011 |
20120089296 | Method for diagnosing and/or adapting at least one system of a device - A method for diagnosing and/or adapting at least one system ( | 04-12-2012 |