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AssigneeRobert Bosch GmbH
InventorsStefan Wickert, Joerg Mosthaf, Christian Fuchs
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The invention concerns a procedure to control a reducing agent generation system of an internal combustion engine, in which the reagent substance is generated in the form of pulses by the reducing agent generation system and is delivered to an exhaust gas duct of the internal combustion engine in front of a SCR-catalytic converter for the selective reduction of the nitrogen oxides contained in the exhaust gas, with a catalytic converter model, in which the reagent substance fill level of the SCR-catalytic converter is modeled and with a closed-loop feedback control system, in which the modeled reagent substance fill level is compared with a storage set point. In so doing, an integrated reagent substance demand is formed by means of a chronological integral concerning the necessary metering of the reagent substance and an integrated reagent substance signal is formed by means of a chronological integral concerning the metered amount of the reagent substance, and a reagent substance demand signal is generated, which at least releases a reagent substance pulse, if the difference between the integrated reagent substance demand and the integrated reagent substance signal exceed a specified threshold value. According to an alternative form of embodiment of the invention, a reagent substance demand signal is generated, which at least releases a reagent substance pulse, if the difference between the storage set point and the reagent substance fill level exceed a specified threshold value. The invention additionally concerns a device to implement the procedure. Procedure and device make it possible to control the reagent substance fill level of an SCR-catalytic converter in a simple manner using a closed-loop feedback system, if the reagent substance is intermittently supplied.
A method of controlling a reducing agent generation system of an internal combustion engine in which a reagent substance is generated in a form of pulses and delivered to an exhaust gas duct of the internal combustion engine upstream of an SCR-catalytic converter for selective catalytic reduction of nitrogen oxides contained in an exhaust gas with a catalytic converter model, the method comprising:
A method of controlling a reducing agent generation system of an internal combustion engine in which a reagent substance is generated in a form of pulses and delivered to an exhaust gas duct of the internal combustion engine upstream of an SCR-catalytic converter for the selective catalytic reduction of the nitrogen oxides contained in an exhaust gas with a catalytic converter model, the method comprising:
A device that controls a reducing agent generation system of an internal combustion engine, in which a reagent substance can be generated in a form of pulses and can be delivered to an exhaust gas duct of the internal combustion engine upstream of a SCR-catalytic converter for selective catalytic reduction of nitrogen oxides contained in an exhaust gas, with a catalytic converter model, in which a reagent substance fill level of the SCR-catalytic converter can be modeled and with a closed-loop feedback control system, in which the modeled reagent substance fill level is compared with a storage set point, the device including a closed-loop control unit with the closed-loop feedback control system, an integrator, an open-loop control unit are part of a control device program in a control device in a motor vehicle with a reducing agent generation system.
Dependencies are inferred from the claim text.