Light diesel engine tail gas aftertreatment system and control method thereof

By moving the ccDOC unit forward in the diesel engine exhaust aftertreatment system and combining it with the front and rear urea injection units and the ASC unit, the problems of high cold start emissions, HC poisoning, and PN10 emissions have been solved, achieving efficient NOx conversion and emission compliance, and simplifying system design.

CN121952701APending Publication Date: 2026-05-01WUXI HENGHE ENVIRONMENTAL PROTECTION TECH CO LTD +1
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Patent Information

Application Number
CN202511817303.7
Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
Filing Date
2025-12-04
Publication Date
2026-05-01

AI Technical Summary

Technical Problem

Existing diesel engine exhaust aftertreatment technologies suffer from high emissions during cold starts, HC-induced catalyst poisoning, N2O generation, and difficulty in meeting PN10 emission standards, thus failing to meet the requirements of China's new generation of emission regulations.

Method used

By moving the ccDOC unit forward before the cCSCR and combining it with the two-stage urea injection unit and the ASC unit, the urea injection rate is monitored by sensors and adjusted by the controller. The catalyst material and layout are optimized to ensure that HC is oxidized before the cCSCR, thereby reducing NH3 leakage and the generation of urea particles.

Benefits of technology

It effectively reduces cold start emissions, avoids catalyst poisoning, improves NOx conversion efficiency, meets PN10 emission standards, simplifies system structure, and reduces cost and complexity.

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Abstract

The invention provides a light diesel engine tail gas after-treatment system and a control method thereof, which can solve the problems of high cold start emission, catalyst poisoning caused by HC, N2O generation and difficulty in reaching the standard of PN10 emission in the prior art, meet the requirements of a new generation of emission regulations, and improve the emission efficiency. Comprising a ccDOC unit, a first urea injection unit, a ccSCR unit, a DPF unit, a second urea injection unit, a second SCR unit and an ASC unit which are sequentially arranged in the tail gas direction of an engine. The controller is electrically connected with the first urea spraying unit and the second urea spraying unit; and the controller controls the first urea injection unit to inject a first urea amount U1 into the tail gas in front of the ccSCR unit and controls the second urea injection unit to inject a second urea amount U2 into the tail gas in front of the second SCR unit according to a preset control method.
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