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Method for fault identification in scr systems by means of ammonia slip

A technology of SCR system and fault identification, which is applied in the direction of electronic control of exhaust gas treatment device, diagnosis device of exhaust gas treatment device, machine/engine, etc.

Active Publication Date: 2021-11-26
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In principle, this method can be applied to two SCR catalysts, however, the dosing of the reducing agent solvent is strongly inhibited by the SCR catalyst arranged upstream

Method used

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  • Method for fault identification in scr systems by means of ammonia slip
  • Method for fault identification in scr systems by means of ammonia slip
  • Method for fault identification in scr systems by means of ammonia slip

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Embodiment Construction

[0028] exist figure 1 shows an SCR system 100 of a combustion motor (not shown) in a motor vehicle, the SCR system having a first SCR catalytic converter 101 and a second SCR catalytic converter 102, in which the SCR system according to the invention is An exemplary embodiment of the method enables the detection of faults. The two SCR catalytic converters 101 and 102 are arranged one behind the other in the exhaust system 120 , wherein the first SCR catalytic converter 101 is arranged closer to a metering module 130 which is located between the two SCR catalytic converters. Upstream of 101 and 102 urea-water-solution is injected into said exhaust train 120 . Furthermore, the SCR system 100 comprises a first ammonia sensor 111 which is arranged between the first SCR catalytic converter 101 and the second SCR catalytic converter 102 and which can measure there The ammonia mass after the exhaust gas aftertreatment of the first SCR catalytic converter 101; and the second ammonia...

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Abstract

The invention relates to a method for fault detection in an SCR system of an internal combustion engine in a motor vehicle, said SCR system having two SCR catalytic converters and at least two ammonia sensors, wherein a first ammonia sensor is arranged at the two Between the two SCR catalysts and the second ammonia sensor is arranged downstream of the two SCR catalysts. The method comprises the steps of continuously acquiring the signal on the first ammonia sensor and learning therefrom the ammonia mass (NH 3 z). Then by the quality of reducing agent added (m Dos ) to carry out overdosing, wherein the converted ammonia mass of the first SCR catalytic converter exceeds the ammonia mass necessary for the reduction of nitrogen oxides, until the ammonia charge level on the first SCR catalytic converter is high The maximum ammonia charge level for the first SCR catalyst.

Description

technical field [0001] The invention relates to a method for fault detection in an SCR system with two SCR catalytic converters by means of ammonia slip. Furthermore, the invention relates to a computer program which, when run on a computer, performs each step of the method, and a machine-readable storage medium storing the computer program. Finally, the invention relates to an electronic controller which is set up to carry out the method. Background technique [0002] A widely used technique for reducing nitrogen oxides (NOx) in the exhaust gases of combustion motors in motor vehicles is selective catalytic reduction ( S elective- C analytic- R education) (SCR). In SCR systems, passing the dosing module upstream of at least one SCR catalyst as reducing agent solution will also be commercially available as Instead, the well-known urea-water solution is injected into the exhaust system. Ammonia produced from the urea-water solution reacts with the nitrogen oxides to fo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F01N11/00
CPCF01N11/00F01N3/2066F01N2550/02F01N2560/021F01N2560/14F01N2610/02F01N2610/146F01N2900/1616F01N13/0093Y02T10/12Y02T10/40Y02A50/20
Inventor A.巴斯托雷亚拉T.普菲斯特
Owner ROBERT BOSCH GMBH