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Postprocessing system of diesel engine

A post-processing, diesel engine technology, applied in mechanical equipment, engine components, machines/engines, etc., can solve the problems of low heat utilization efficiency and high fuel consumption rate, and achieve the effect of extending interval, high energy utilization rate and reducing fuel consumption

Inactive Publication Date: 2009-06-17
CHERY AUTOMOBILE CO LTD
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Problems solved by technology

[0009] The purpose of the present invention is to provide a new type of diesel engine after-treatment system to solve the problem of heat utilization of the entire system in practical applications of the DPF system that adopts a tightly coupled DOC and DPF arrangement and uses secondary injection of fuel in the cylinder to realize active regeneration. Low efficiency and high fuel consumption

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  • Postprocessing system of diesel engine
  • Postprocessing system of diesel engine

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Embodiment Construction

[0026] The present invention will be described in detail below according to the accompanying drawings, which is a preferred embodiment among various implementations of the present invention.

[0027] When the exhaust gas temperature of the engine is lower than 250°C, the partial flow-through metal filter coated with an oxidation catalyst can oxidize most of the HC and CO and some particulate matter in the exhaust of the diesel engine on the one hand, and can also oxidize NO in the exhaust is oxidized to NO 2, and at the same time capture a part of the particulate matter in the exhaust gas. When the unfiltered exhaust gas flows through the wall-flow ceramic filter, most of the particles contained in it will be filtered, and the total filtration efficiency of the two-stage filter can reach more than 95%. Since the metal filter oxidizes part of the particulate matter (including HC adhering to the particulate matter, etc.), the amount of particulate matter captured by the two-sta...

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Abstract

The invention relates to a diesel engine post treatment system comprising a tight coupling partial flow metal filter and a wall flow ceramic filter, wherein, a first stage tight coupling partial flow metal filter is arranged at the outlet of an exhaust manifold, a first stage wall flow ceramic filter is arranged behind the first stage tight coupling partial flow metal filter, and the partial flow metal filter and the wall flow ceramic filter are respectively covered with oxidation catalyst. The energy availability factor of the entire post treatment system is higher, and the burning-out or the cracking and other failure risks in the post treatment system in the active regenerative process are greatly reduced, thereby increasing the reliability of the system.

Description

technical field [0001] The invention relates to a diesel engine exhaust aftertreatment technology, in particular to a diesel engine aftertreatment system. Background technique [0002] Higher fuel economy and less CO due to global warming and depletion of fossil fuels 2 Diesel engines that emit less emissions are increasingly favored by consumers and automakers. According to the latest statistics, more than one-third of new cars in Europe are now diesel cars. In addition, in order to better protect the natural environment on which human beings depend, countries around the world have enacted stricter emission regulations. For diesel engines, due to their own working characteristics, particulate matter PM (particulate matters) and nitrogen oxides NO x (nitrogen oxides) are its two major emissions. In order to meet the strict emission requirements of PM emission regulations in various countries, DPF (Diesel Particulate Filter) technology has been gradually developed. [00...

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Application Information

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IPC IPC(8): F01N3/035F01N3/28
Inventor 杨德胜
Owner CHERY AUTOMOBILE CO LTD
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