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Method for zero calibration of nitrogen oxide sensor

A nitrogen oxide and zero-point calibration technology, which is applied in the direction of instruments, scientific instruments, machines/engines, etc., can solve ammonia emissions and other problems

Pending Publication Date: 2020-11-10
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In both technologies, output of ammonia emissions may occur during operation

Method used

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  • Method for zero calibration of nitrogen oxide sensor
  • Method for zero calibration of nitrogen oxide sensor

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Embodiment Construction

[0017] exist figure 1 The internal combustion engine 10 shown in has an exhaust gas system 11 . An NSC catalytic converter 21 , a first SCR catalytic converter 22 arranged on the diesel particle filter and a second SCR catalytic converter 23 combined with a CUC catalytic converter (clean catalytic converter) are arranged one behind the other in the exhaust gas system 11 . The HWL is stored in a reducing agent tank 30 , on the bottom of which a delivery module 31 is arranged. The first metering module 32 is arranged upstream of the first SCR catalytic converter in the exhaust gas system 11 . The second metering module 33 is arranged upstream of the second SCR catalytic converter 23 in the exhaust gas system 11 . The two metering modules 32 , 33 are supplied with HWL by means of the delivery module 31 , which meter the HWL into the exhaust gas system 11 . Ammonia is released from the HWL and reacts with nitrogen oxides in a selective catalytic reduction reaction in the SCR ca...

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Abstract

The invention relates to a method for zero calibration (83) of a nitrogen oxide sensor which is laterally sensitive to ammonia and which is arranged downstream of an SCR catalyst in the exhaust gas system of an internal combustion engine, at least one measured value of the nitrogen oxide sensor being used as an adaptation value in the following operating state of the internal combustion engine, inthis operating state, the exhaust gas system does not contain nitrogen oxides. The zero calibration (83) is released (82) only when the exhaust gas system does not contain ammonia at the location ofthe nitrogen oxide sensor.

Description

technical field [0001] The invention relates to a method for zero point calibration of an ammonia laterally sensitive nitrogen oxide sensor. Furthermore, the present invention relates to a computer program implementing 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] For example, exhaust gas aftertreatment systems for reducing NOx emissions use technologies such as NOx storage catalytic converters (NSC) or selective catalytic reduction (SCR) of NOx. In both technologies, output of ammonia emissions may occur during operation. [0003] The NSC catalyst stores nitrogen oxides from the oxygen-enriched exhaust gas in the form of nitrates in the presence of noble metal catalysts. By enriching the fuel-air mixture in the internal combustion engine, nitrogen oxide molecules are passed into the exhaust gas flo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N11/00F02D41/14G01N27/00
CPCF01N11/00F02D41/1461F02D41/1463G01N27/00F01N2560/026F01N2560/14F02D41/2474F02D41/123F02D41/1494F02D2041/1468F02D2041/281F01N13/008F01N2560/021F01N2900/08F01N3/2066F01N2900/1602Y02T10/12Y02T10/40G01N27/4175
Inventor J.雷德S.克莱因T.杭德勒
Owner ROBERT BOSCH GMBH