Method and device for process control of an exhaust gas purification system
An exhaust gas purification system and process control technology, which is applied in the direction of exhaust equipment, electric control of exhaust treatment equipment, silencer equipment, etc., and can solve problems such as component damage
Active Publication Date: 2022-03-01
ROBERT BOSCH GMBH
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Problems solved by technology
Damage to components may thus occur due to the reducing agent frozen in the metering module
Furthermore, with the current generation of SCR systems for cars (known under DNOX 5.x), the delivery module can only be heated by actuating the delivery and return pumps
Method used
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Embodiment Construction
[0027] figure 1 An internal combustion engine 1 is shown schematically, which consists of an engine block 10 and an exhaust gas duct 20 in which, in the flow direction of the exhaust gas, behind the engine block 10 is arranged a Exhaust gas sensor 30 , behind which a catalytic converter 40 is arranged. Oxygen sensor 30 enables Lambda regulation and is used for diagnostic evaluation of the storage capacity of the catalytic converter. Arranged downstream of catalytic converter 40 is a further exhaust gas sensor 60 , for example a two-point oxygen sensor, which is used for guided control and interruption detection of catalytic converter diagnostics of catalytic converter 40 . In the example shown, an SCR catalytic converter 70 for nitrogen oxide reduction is arranged downstream of the first catalytic converter 40 in the exhaust gas tract 20 . A further exhaust gas sensor 80 is used to monitor the exhaust gas value at the outlet of the exhaust gas purification system.
[0028] ...
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The invention relates to a method and a device, in particular for optimizing the flow control of a dosing unit for an exhaust gas purification system of an internal combustion engine with an SCR catalytic converter. Provision is made here to precalculate the temperature (i) of the exhaust gas and / or the temperature (j) of the exhaust gas component of the exhaust gas cleaning system at various locations, starting from the route section data and / or further additional data, In this way, the operational readiness of the dosing unit is optimized, in particular with regard to pressure build-up or evacuation. As a result, an optimization of the exhaust gas purification system and thus a reduction of pollutant emissions can be achieved. Furthermore, a reduction in component load can be achieved by taking this temperature prediction into account during process control.
Description
technical field [0001] The invention relates to a method for process control of exhaust gas aftertreatment components of an exhaust gas purification system of an internal combustion engine having at least one SCR system in its exhaust gas tract, said SCR system consisting at least of an SCR catalytic converter situated in the exhaust gas tract and a dosing unit with a dosing valve and a pressure build-up system as a component of the exhaust gas purification system, and for the method, the nitrogen oxide reduction can be carried out by the dosing unit in the flow direction of the exhaust gas at the The reducing agent is introduced upstream of the SCR catalyst, wherein the temperature prediction for a later point in time is also used by means of the control unit in addition to the actual temperature. [0002] Furthermore, the invention relates to a device, in particular an engine control unit or a control unit, for carrying out the method. Background technique [0003] System...
Claims
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IPC IPC(8): F01N3/20F01N9/00
CPCF01N3/208F01N2610/02F01N2560/06F01N2570/14F01N3/2066F01N2610/144F01N2900/10F01N2900/1404F01N2900/1602Y02T10/12F01N9/00F01N2610/1453
Inventor A.费尔德格斯D.泽利希S.伯姆S.拉策尔
Owner ROBERT BOSCH GMBH