Engine aftertreatment system and vehicle

Abstract

The invention relates to an engine aftertreatment system and a vehicle. In the engine aftertreatment system, an oxidation catalyst is used for being arranged in an engine compartment, a gas inlet of the oxidation catalyst is used for communicating with a gas outlet of an engine, a particulate matter filter is used for being arranged on a vehicle frame outside the engine compartment, a gas outlet of the particulate matter filter communicates with a gas outlet of the oxidation catalyst through a first pipeline, a low-pressure EGR system is arranged in the engine compartment, an gas inlet of thelow-pressure EGR system takes air from the filtered side of the particulate matter filter through a second pipeline, a gas outlet of the low-pressure EGR system communicates with a gas inlet of the engine, a gas inlet of a selective catalytic reduction converter communicates with a gas outlet of the particulate matter filter, a gas inlet of an ammonia purification catalyst communicates with a gasoutlet of the selective catalytic reduction converter, and a gas outlet of the ammonia purification catalyst is used for communicating with the external environment. The particulate matter filter is arranged on the vehicle frame outside the engine compartment, use of the internal space of the engine compartment is reduced, and therefore a certain space is reserved to meet the arrangement requirement of a low-pressure EGR system.

Description

technical field [0001] The present disclosure relates to the technical field of vehicles, and in particular, relates to an engine aftertreatment system and a vehicle. Background technique [0002] With the continuous deepening of my country's environmental protection and atmospheric governance, the Ministry of Environmental Protection and the General Administration of Quality Supervision, Inspection and Quarantine issued the "Light Vehicle Pollutant Emission Limits and Measurement Methods ( China's sixth stage)" will be implemented on July 1, 2020, and "Heavy-duty diesel vehicle pollutant emission limits and measurement methods (China's sixth stage)" will be implemented on July 1, 2019. China has officially entered the era of "National VI". The aftertreatment system of the engine becomes the key to making light and heavy vehicles meet the "National VI" emission standards. [0003] In order to meet the emission standards of China 6b, a low-pressure EGR system is often arrang...

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Problems solved by technology

[0003] In order to meet the emission standards of China 6b, a low-pressure EGR system is often arranged in the aftertreatment system to treat the exhaust gas. However, in some models, such as mid-engine models, the mid-engine cabin is mostly arranged under the seat. The space is too small to meet the space layout requirements of the low-pressure EGR system, and the technical route often needs to be replaced, resulting in a huge development workload, that is, development costs

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