Method for learning at least one pump feature of pump of feed module of scr catalyst system

A technology of conveying modules and catalytic converters, applied in general control systems, control/regulation systems, instruments, etc.

Active Publication Date: 2019-07-19
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

With current monitoring via pressure sensors, only large leaks can be reliably detected, only large leaks can be reliably identified

Method used

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  • Method for learning at least one pump feature of pump of feed module of scr catalyst system
  • Method for learning at least one pump feature of pump of feed module of scr catalyst system
  • Method for learning at least one pump feature of pump of feed module of scr catalyst system

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Experimental program
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Embodiment Construction

[0058] exist figure 1 3 shows an SCR catalytic converter system 10 with a metering device for metering an aqueous urea solution (HWL) 12 into the exhaust system 10 of an internal combustion engine 14 (only indicated) of a motor vehicle. By means of selective catalytic reduction (SCR), the SCR catalyst system 10 is used in a manner known per se for reducing nitrogen oxides in the exhaust gas of the internal combustion engine 1 . For the reduction, HWL 12 as reducing agent is injected via metering valve 16 of metering module 17 into exhaust gas train 18 upstream of SCR catalyst 20 and downstream of oxidation catalyst 22 .

[0059] The HWL 12 is stored in a storage tank 24 having a liquid level sensor 26 and a temperature sensor 28 which are respectively connected to a controller 29 . The metering valve 16 of the metering module 17 is supplied with HWL 12 from the storage tank 24 by means of the delivery module 30 .

[0060] The delivery module 30 has a delivery pump 32 which r...

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Abstract

The present invention relates to a method (100) for learning at least one pump feature of a pump (32) for a feed module (32) of an SCR-catalyst system (10), including the following steps: (110) obtaining a to-be-learned reference value (nPmpRef) of at least one pump feature (p, T, q), wherein the reference value (nPmpRef) is saved in a reference matrix; and (120) obtaining a to-be-learned deviation value (DeltanPmp), wherein the deviation value is the deviation between the at least one pump feature and the reference value (nPmpRef), and the to-be-learned deviation value is saved in a deviationmatrix.

Description

technical field [0001] The invention relates to a method for learning at least one pump characteristic of a pump of a delivery module of an SCR catalytic converter system, a computer program, a machine-readable storage medium and an electronic controller. Background technique [0002] Against the background of future legal requirements, it is necessary to reduce the undesired emissions of internal combustion engines in order to achieve and comply with prescribed exhaust gas limit values. Due to ever-increasing legal requirements on the emission values ​​of internal combustion engines, the exhaust gases from internal combustion engines are subjected to aftertreatment in order to comply with the prescribed limit values. In order to meet these limit values, exhaust gas aftertreatment systems are used downstream of the internal combustion engine, the purpose of which is to reduce the concentration of particles and nitrogen oxides in the exhaust gas. The filters and catalytic co...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N9/00F01N3/20F01N11/00
CPCF01N3/208F01N11/00F01N11/002F01N11/007F01N2610/144F01N2900/0402F01N9/00F04B51/00F01N2560/021F01N2900/0412Y02T10/40F01N3/2066F04B49/06G05B13/02F01N2610/1433
Inventor F.邓克M.施莱克
Owner ROBERT BOSCH GMBH
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