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Method for measuring reducing agent

A reducing agent and mass flow technology, applied in the direction of air quality improvement, electronic control of exhaust treatment devices, exhaust treatment, etc., can solve problems such as SCR-catalyst conversion deterioration

Active Publication Date: 2012-08-08
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

A reduction in the loading state can of course lead to a short-term conversion deterioration of the SCR catalytic converter

Method used

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  • Method for measuring reducing agent

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Embodiment Construction

[0052] figure 1 Indicates that the abscissa is the temperature T of the SCR-catalyst, the maximum possible NH of the SCR-catalyst 3 Load mNH3LdMax. As the temperature increases the SCR-catalyst can store less NH 3 -quantity. During normal driving, phases with high and low SCR catalytic converter temperatures T alternate continuously. When the SCR-temperature T increases, especially in an overmetered system, NH can be reached quickly 3 - Storage capacity limit mNH3LdMax. The risk of ammonia being emitted into the exhaust gas after the SCR catalytic converter is high. Regulation, especially in the case of overmetering, can therefore become problematic at this stage in SCR catalytic converter systems according to the prior art, since the reductant metering can be set in the wrong direction. It can thus be seen that at an ammonia loading 1 which corresponds to the maximum possible ammonia loading mNH3LdMax at a given temperature, there is NH 3 - High risk of venting, if th...

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Abstract

The invention provides a method for adjusting a reducing agent measurement quantity for an SCR- catalyst system, especially for an automobile SCR-catalyst system. The steps are as follows: calculating a largest NH3-load of an SCR- catalyst, calculating an NH3-limit loading of the SCR- catalyst by multiplying measured input amount of ammonia with a coefficient F and / or by adding measured input amount of ammonia with a bias, and by subtracting consumption amount of ammonia of the SCR- catalyst and indicating for a control unit of the SCR- catalyst system that the danger is increased when the ammonia is discharged into exhaust gas until the NH3-limit loading is larger or equal to the largest NH3-load. A computer program product with a programming code for implementing this method can be easily used on an existing engine but other parts are not needed to be installed in the SCR- catalyst system. Only the operation of a programming code stored on the computer program product is needed, such as matching software in a control instrument of an internal combustion engine.

Description

technical field [0001] The invention relates to a method for regulating the metering of reducing agent in an SCR catalytic converter system, in particular in an SCR catalytic converter system of a motor vehicle. The invention also relates to a computer program product with program code stored on a machine-readable carrier for carrying out the method according to the invention, and an SCR catalytic converter system comprising a controller, A computer program runs on this controller, which implements all the methods according to the invention. Background technique [0002] Methods and devices are known for operating an internal combustion engine, in which an SCR catalyst (selective catalytic reduction) is arranged in the exhaust gas region, which oxidizes nitrogen contained in the exhaust gas of an internal combustion engine in the presence of a reducing agent substances (NOx) are reduced to nitrogen (N 2 ). Such SCR catalytic converters are used, for example, in the exhaus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N9/00F01N3/10
CPCF01N2900/1602F01N2900/10F01N2900/0601F01N2560/021F01N9/005Y02T10/24F01N2900/1621F01N2560/026F01N3/208F01N2900/1622Y02A50/20Y02T10/12
Inventor F.施魏泽
Owner ROBERT BOSCH GMBH
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