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Method for operating a component part disposed in an exhaust gas region of an internal combustion engine and device for implementing the methodRelated Patent Categories: Power Plants, Internal Combustion Engine With Treatment Or Handling Of Exhaust Gas, Methods, Anti-pollutionMethod for operating a component part disposed in an exhaust gas region of an internal combustion engine and device for implementing the method description/claimsThe Patent Description & Claims data below is from USPTO Patent Application 20070039311, Method for operating a component part disposed in an exhaust gas region of an internal combustion engine and device for implementing the method. Brief Patent Description - Full Patent Description - Patent Application Claims
FIELD OF THE INVENTION [0001] The present invention relates to a method for operating a component part disposed in an exhaust gas region of an internal combustion engine and a device for implementing the method. BACKGROUND INFORMATION [0002] German Published Patent Application No. 199 06 287 describes a method for regenerating a particulate filter disposed in the exhaust gas region of an internal combustion engine, in which changes are made between various operating states as a function of the most recently present operating state, and as a function of the state of the particulate filter. In one operating state, a regeneration of the particulate filter from the embedded particles takes place. [0003] The regeneration takes place at an increased temperature, at which the particles, chiefly soot particles and ash particles, are burned by an oxidation reaction. In the average operation of an internal combustion engine, the temperature of the particulate filter lies in a temperature range of 150 to 300 degrees Centigrade, in general, therefore, below the temperature required for the regeneration. Therefore, in general, special heating measures are required in order to initiate regeneration. The required temperature may be reached, for instance, via an increase of the temperature of the exhaust gas of the internal combustion engine. Since the exhaust gas has to heat up, besides the particulate filter, additional component parts that may be present, that is, the exhaust gas region as a whole, some minutes may pass until the regeneration starts. An estimate of the duration of the regeneration, that is a function of the loading state of the particulate filter and of its size, would currently be up to 25 minutes. [0004] If the internal combustion engine is situated in a motor vehicle, situations are conceivable in which a complete regeneration of the particulate filter is not possible or is not even able to be begun. Such situations, on the one hand, are fault states such as an engine oil dilution by a previous regeneration. On the other hand there may be operating states present in which the internal combustion engine does not even reach its own nominal operating temperature. Such an operating state occurs, for example, in short-range operation of the motor vehicle. In this case, a regeneration procedure may perhaps be broken off or may not start in the first place. [0005] German Published Patent Application No. 198 43 879 describes a method for operating an internal combustion engine, in whose exhaust gas region an NOx adsorption catalyst is situated. In a first operating phase in which the internal combustion engine is driven using a lean mixture within the scope of a stratified cylinder charge, the NOx created is stored in the NOx adsorption catalyst. In a second operating phase, in which the internal combustion engine is operated with a stoichiometric or rich mixture within the scope of a homogeneous cylinder charge, the NOx adsorption catalyst is regenerated. As in the particulate filter, the regeneration of the NOx adsorption catalyst takes place at increased catalyst temperatures, compared to normal operating conditions, which are able to be reached using special catalyst heating measures. The duration of the regeneration of the NOx adsorption catalyst lies within the range of seconds, and is therefore considerably shorter compared to the duration of the regeneration of a particulate filter. Still, based on the required heating measures, in principle, the same problems occur as in the regeneration of the particulate filter. Here, too, situations are conceivable in which the regeneration is broken off or is not started in the first place. SUMMARY OF THE INVENTION [0006] The object of the present invention is to specify a method for operating a component part disposed in an exhaust gas region of an internal combustion engine and a device for implementing the method which ensure the operating readiness of the component part. The method according to the present invention and the device according to the present invention for carrying out the method provide that, in a first operating phase, an exhaust gas component of the internal combustion engine is embedded in a component part situated in the exhaust gas region of the internal combustion engine, and, in a second operating phase, the component part is regenerated from the embedded exhaust gas component. The second operating phase is started as a function of the operating state of the component part and/or as a function of the operating state of the internal combustion engine. According to the present invention, it is provided that the second operating phase is furthermore started by an external start signal. [0007] The measure according to the present invention makes it possible to ensure the operating readiness of the component part in that the operating phase, in which the component part is regenerated from the embedded exhaust gas component, is able to be started at will, using the external start signal. The regenerated state of the component part may be produced, for example, by an operator, as desired. The desire to do this may occur during service performed on the internal combustion engine and the components assigned to it. If the internal combustion engine is situated in a motor vehicle, the demand may occur within the scope of stays in a repair shop. The measure according to the present invention makes it possible to put the component part into a specified state that is equivalent to the regenerated state. In this application, the measure according to the present invention makes possible the diagnosis of the internal combustion engine and the components assigned to it, starting from the regenerated state of the component part. The vehicle operation of the motor vehicle, that was possibly restricted before, may be restored again. [0008] A first further refinement provides that the external start signal is guided via a diagnosis interface. These days, diagnosis interfaces are usually present, provided the internal combustion engine is situated in a motor vehicle. In this application, normalized interfaces will in future be prescribed by law, so that one may assume their increasing availability. The external start signal is preferably made available by a diagnostic unit which may be contacted in a simple manner if a diagnosis interface is present. [0009] Another refinement provides that, when the external start signal is present, the second operating phase is started only if at least one additional condition has been satisfied at the same time. [0010] Such a condition is, for instance, that the temperature and/or the rotary speed of the internal combustion engine lie within a prespecified range. A further condition is, for example, that the speed of a motor vehicle is equal to zero. Still another condition is, for example, that a performance specification signal of the internal combustion engine corresponds to an idling value, at which the internal combustion engine is at least within the range of its idling speed. Yet another condition is, for instance, that an idling controller, that is included in the control system of the internal combustion engine, is in a steady state, at which the idling speed regulation of the internal combustion engine is held at least approximately constant. [0011] One embodiment of the method according to the present invention, and of the device according to the present invention for carrying out the method, provides that, in the second operating phase of the internal combustion engine, an increase in the temperature of the exhaust gas of the internal combustion engine is provided. [0012] The method according to the present invention and the device according to the present invention for carrying out the method are particularly suitable for producing the operating readiness of a catalytic converter designed as catalytic converter with hydrogen trap, especially as an NOx adsorption catalyst and/or a particulate filter, preferably a Diesel particulate filter. BRIEF DESCRIPTION OF THE DRAWING [0013] The FIGURE shows a technical environment in which a method according to the present invention proceeds. DETAILED DESCRIPTION [0014] The FIGURE shows an internal combustion engine 10 in whose intake area an air mass flow sensor 11 is situated, and in whose exhaust gas region 12 a temperature sensor 13 and a component part 14 are situated. Air mass flow sensor 11 emits an air mass flow signal msl to a control system 15. Temperature sensor 13 makes available to control system 15 a temperature tabg of the exhaust gas of internal combustion engine 10. Control system 15 also has supplied to it a performance setpoint signal ps, a rotary speed signal n of internal combustion engine 10, as well as a regeneration signal r made available by a regeneration control system 16 Control system 15 emits a fuel metering signal msk to internal combustion engine 10, emits an exhaust gas recirculation signal agr to an exhaust gas recirculation valve 17 which sets a recirculated exhaust gas quantity 18, and emits an idling controller signal lr to a condition tester 19. [0015] Rotary speed signal n and performance setpoint signal ps are also made available to condition tester 19. Condition tester 19 also receives a speed signal v, an engine temperature signal tmot and an external start signal s that are supplied to it. External start signal s is made available by a diagnostic unit 20, and is passed on to condition tester 19 via a diagnosis interface 21. [0016] Condition tester 19 emits a regeneration release signal rf to regeneration control system 16. Furthermore, a pressure difference signal dp is supplied to regeneration control system 16, which makes available a pressure difference 22, which records the pressure difference of the exhaust gas in front of and behind component part 14. [0017] The method according to the present invention and the device according to the present invention for carrying out the method operate as follows: [0018] As a function of performance setpoint signal ps, control system 15 set the fuel quantity, that is to be supplied to internal combustion engine 10, using fuel quantity signal msk, which is supplied to a system that meters in fuel and is not shown in detail. In this instance, air mass flow signal msl is taken into consideration, which is made available by air mass flow sensor 11, which is situated in the intake region of internal combustion engine 10. If internal combustion engine 10 is a Diesel internal combustion engine, in principle, no additional input variables are needed for setting fuel quantity signal msk. If necessary, an exhaust gas sensor is provided, that is not shown, which emits a lambda signal to control system 15, as a measure for the air-fuel ratio in the exhaust gas of the internal combustion engine. Also not shown is a possibly present throttle valve in the intake region of internal combustion engine 10, which either emits a throttle valve signal to control system 15, or which is activated by control system 15. [0019] The concentration of nitrogen oxides in the exhaust gas of internal combustion engine 10, as well as temperature tabg of the exhaust gas may be influenced using recirculated exhaust gas quantity 18, which controls control system 15 via exhaust gas recirculating valve 17 using exhaust gas recirculating signal agr. 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