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Method for monitoring the nitrogen oxide decontamination in a motor vehicle

A technology of nitrogen oxides and control methods, applied in electrical control, engine control, machine/engine, etc.

Active Publication Date: 2015-11-04
PEZHO SITROEN AUTOMOBILS SA
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This treatment of nitrogen oxides is therefore not as effective as treatment by SCR systems specifically dedicated to the removal of nitrogen oxides

Method used

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  • Method for monitoring the nitrogen oxide decontamination in a motor vehicle
  • Method for monitoring the nitrogen oxide decontamination in a motor vehicle

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Embodiment Construction

[0032] figure 1 An example of an exhaust line L provided with a removal element coupled to the control unit 6 is shown. One end of the exhaust line L starts from the exhaust manifold 1 a of the internal combustion engine 1 of the vehicle. In this exhaust line L, a nitrogen oxide trap or NOx trap 2 is arranged as the first nitrogen oxide removal element, followed by a particle filter for diesel engines, but more and more commonly for gasoline engines 3. These particles are usually carbon black particles. The particle filter 3 has a filter medium for trapping particles contained in the gas of the exhaust line L. As shown in FIG.

[0033] The filter media of the particulate filter 3 is impregnated with an SCR type removal agent, which enables reconstitution of the particulate filter and SCR system into a single removal element. Advantageously, a nitrogen oxide detector 4 can be arranged upstream of the NOx trap 2 and a nitrogen oxide detector 5 downstream of the particle filt...

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Abstract

The invention relates to a method for monitoring the nitrogen oxide decontamination in an exhaust line (L) comprising switching from an SCR mode to an LNT mode when the SCR tank (8) is empty or contains a minimum SCR agent quantity critical in ensuring the decontamination, a return to the SCR mode being provided as soon as the SCR tank (8) has been filled again, and at least one urgent warning being sent to the driver when the SCR tank (8) is empty or only contains said minimum quantity, such as to allow him / her to decide whether he / she wants to travel using the LNT mode or fill the SCR tank (8).

Description

technical field [0001] The present invention relates to a method of controlling the removal of nitrogen oxides in the exhaust line of a motor vehicle, the nitrogen oxide removal system comprising an SCR system. More specifically, the invention relates to the possibility of switching the SCR removal mode of nitrogen oxides to another mode, which is LNT mode and uses a nitrogen oxide trap or a NOx trap. This can occur when the SCR vessel is empty or re-reached critical levels to ensure satisfactory removal over the next few kilometers. [0002] The technical field of the invention is in particular gasoline or diesel decontamination of vehicles with internal combustion engines. More particularly but not limitatively, the invention applies to a diesel engine with a removal system relating in particular to nitrogen oxides and also comprising at least one particulate filter. Background technique [0003] There are two main systems for removing nitrogen oxides. The first system ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/08F01N3/20F01N9/00
CPCF01N3/0842F01N3/2066F01N3/208F01N9/00F01N2900/1814F02D41/0235F02D41/0275F02D2041/228Y02T10/24Y02T10/47Y02A50/20Y02T10/12Y02T10/40
Inventor G·克里恩
Owner PEZHO SITROEN AUTOMOBILS SA