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Method for diagnosing SCR (selective catalytic reduction) system

A technology of SCR system and SCR catalytic converter, which is applied in the field of electronic controller and machine-readable storage medium

Active Publication Date: 2019-10-29
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, it is no longer possible to ensure compliance with emission regulations

Method used

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  • Method for diagnosing SCR (selective catalytic reduction) system
  • Method for diagnosing SCR (selective catalytic reduction) system
  • Method for diagnosing SCR (selective catalytic reduction) system

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Embodiment Construction

[0024] figure 1 A schematic diagram of an SCR system 1 for an SCR catalytic converter 2 in an exhaust system 3 of an internal combustion engine 4 is shown. The SCR system 1 has a delivery module 10 with a delivery pump 11 , which delivers reducing agent solution from a reducing agent tank 12 via a pressure line 13 to a metering module 14 . Via a metering valve 15 in the metering module 14 , the reducing agent solution is then metered into the exhaust train 3 upstream of the SCR catalytic converter 2 . The undosed reducing agent solution flows back into the reducing agent tank 12 via a return 16 connected to the pressure line 13 . Arranged in the return flow 16 is a return flow throttle 17 which limits the mass of reducing agent solution flowing through the return flow 16 . Furthermore, a pressure sensor 18 is arranged in the pressure line 13 , where it measures the pressure p of the reducing agent solution located in the pressure line. Arranged in the exhaust train 3 downst...

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Abstract

The invention relates to a method for diagnosing an SCR (selective catalytic reduction) system. The SCR (selective catalytic reduction) system is provided with a delivery pump and a proportioning valve. The method comprises the steps that a pressure fault in the SCR (selective catalytic reduction) system is identified at the beginning, and then a pressure-adjusted mode of the SCR (selective catalytic reduction) system is set; then, the mass deviation (delta m) of a reducing agent solution is detected; and finally, when the mass deviation (delta m) is greater than a first threshold value (S1),a fault on the delivery pump is output, and when the mass deviation (delta m) is less than or equal to the first threshold value (S1), a fault on the proportioning valve is output.

Description

technical field [0001] The invention relates to a method for diagnosing an SCR system when a pressure fault in the SCR system is detected. Furthermore, the present invention relates to a computer program implementing each step of the method when the computer program is run on a computing device, 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 according to the invention. Background technique [0002] Today, in particular SCR catalysts (Selective Catalytic Reduction) are used for reducing nitrogen oxides (NOx) in the exhaust gas of internal combustion engines in motor vehicles. Here, nitrogen oxide molecules (Stickoxidmoleküle) located on the surface of the SCR catalyst are reduced to elemental nitrogen (elementarem Stickstoff) in the presence of ammonia (NH3) as reducing agent. The reducing agent is supplied as aqueous urea (from which ammonia is separated)...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F01N3/20
CPCF01N11/00F01N3/2066Y02T10/12Y02T10/40Y02A50/20
Inventor A.特斯克M.施特格迈尔
Owner ROBERT BOSCH GMBH
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