Double evaporation type DPF regeneration system for light vehicle

Abstract

The invention relates to a DPF regeneration system, in particular to a double evaporation type DPF regeneration system for a light vehicle, and belongs to the technical field of diesel engine tail gas treatment. The double evaporation type DPF regeneration system comprises a diesel engine, a fuel tank, an ECU, a DCU, a primary evaporation type fuel injection device, a secondary evaporation type fuel injection device, a primary oxidation catalytic converter and a secondary oxidation catalytic converter. The exhaust end of the diesel engine is connected with the air inlet end of the primary oxidation catalytic converter through an exhaust manifold, the air outlet end of the primary oxidation catalytic converter is connected with the air inlet end of the secondary oxidation catalytic converter through a first middle exhaust pipe, the primary evaporation type fuel injection device is arranged between the diesel engine and the primary oxidation catalytic converter, and the secondary evaporation type fuel injection device is arranged between the primary oxidation catalytic converter and the secondary oxidation catalytic converter. Exhaust gas of the diesel engine is heated twice, and the working condition range of the engine capable of carrying out particulate matter trap regeneration can be greatly enlarged.

Description

technical field [0001] The invention relates to a DPF regeneration system, in particular to a double-evaporation DPF regeneration system for light vehicles, which belongs to the technical field of diesel engine tail gas treatment. Background technique [0002] Diesel engines have been widely used due to their economic and power advantages. However, the emissions of nitrogen oxides, NOx, and particulate matter (particulate matter, PM) in the exhaust gas, especially particulate matter emissions, are 30-80% of gasoline engines with the same displacement. times, seriously endangering the living environment and health of human beings. At present, diesel particulate filter (Diesel particulate filter, DPF) is considered to be the most effective after-treatment technology to reduce particulate matter emissions, and the key issue in application is regeneration. [0003] In the prior art, the regeneration method of secondary fuel injection in the exhaust pipe upstream of the oxidatio...

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Problems solved by technology

[0004] At present, the DPF regeneration system of a diesel engine mainly uses a single-stage oxidation catalytic converter to increase the exhaust gas temperature. Due to the limited layout space of the light vehicle engine, the single-stage oxidation catalytic converter is too large in order to arrange the oxidation catalytic converter close to the exhaust manifold. , the space is not enough, and the oxidation catalytic converter is far away from the particle filter, which will cause the temperature of the oxidation catalytic converter to be too low, and the oxidation efficiency is low, resulting in secondary pollution

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