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Vehicle and vehicle tail gas after-treatment system

A technology for after-treatment of exhaust gas and vehicles, which is applied in the direction of exhaust treatment, exhaust device, air quality improvement, etc.

Active Publication Date: 2021-12-28
GREAT WALL MOTOR CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

N 2 O has been valued by the automobile industry, for example, N in the National VI regulations for light-duty diesel vehicles 2 The emission limit of O is 30mg / km, and it is speculated that in the future Euro VII will target N 2 O emission limits will be more stringent, but N 2 O emission reduction is a difficult problem for the entire automobile industry, and there is still no effective way to effectively reduce automobile emission N 2 O's design is imminent

Method used

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  • Vehicle and vehicle tail gas after-treatment system
  • Vehicle and vehicle tail gas after-treatment system
  • Vehicle and vehicle tail gas after-treatment system

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Embodiment Construction

[0025] It should be noted that, in the case of no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0026] In the present invention, it should be understood that the orientation or positional relationship indicated by the terms "deviation", "facing" and the like correspond to the actual orientation or positional relationship; inside and outside. These are only for the convenience of describing the present invention and simplifying the description, rather than indicating that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present invention.

[0027] In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable con...

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Abstract

The invention relates to the field of vehicle tail gas after-treatment systems, and provides a vehicle and a vehicle tail gas after-treatment system. The vehicle tail gas after-treatment system comprises a lean-burn NOX trapping device and a nitrous oxide trapping device, and the nitrous oxide trapping device is located on the downstream of the lean-burn NOX trapping device; the nitrous oxide trapping device comprises a carrier and a catalyst coating coated on the carrier, the catalyst coating comprises noble metal, the noble metal comprises rhodium, and the weight percentage of rhodium in the noble metal is not less than 90%. According to the vehicle tail gas after-treatment system, firstly, a certain amount of N2O is generated through the lean-burn NOX trapping device; and when the tail gas flows to the nitrous oxide trapping device, N2O is adsorbed without competition under trapping of the catalyst coating taking rhodium as a main component, so that the content of N2O in the gas discharged into the tail gas after-treatment system is greatly reduced.

Description

technical field [0001] The invention relates to the technical field of vehicle exhaust aftertreatment, in particular to a vehicle and its exhaust aftertreatment system. Background technique [0002] Whether it is a model equipped with a diesel engine or a gasoline engine, more or less nitrous oxide (N 2 O). Especially for light-duty diesel vehicle after-treatment systems matched with LNT, this phenomenon is more obvious. Existing light-duty diesel vehicle exhaust after-treatment systems such as figure 1 As shown, along the exhaust emission direction, the lean NO X Capture device (lean NO X trap, LNT) 1, diesel particulate filter (Diesel Particulate Filter, DPF) 5 and selective catalytic reduction device (Selective Catalytic Reduction, SCR) 6. [0003] NO accounts for more than 90% of the gas entering the exhaust aftertreatment system from the exhaust inlet after the supercharger. When the engine is rich in combustion (for example, the operating condition of the throttl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F01N3/28F01N3/20
CPCF01N3/2803F01N3/2825F01N3/2807F01N3/2066F01N3/2882F01N2570/10F01N2610/05Y02A50/20Y02T10/12
Inventor 赵振兴石伟田园
Owner GREAT WALL MOTOR CO LTD