Control method of engine assembly, related device, and vehicle

By introducing a return pipeline and catalytic converter mode switching into the engine assembly, the environmental pollution problem caused by NOx release from the first catalytic converter is solved, achieving effective conversion and storage of NOx, reducing the emission of unreacted NOx, and improving fuel economy and power output.

CN122304887APending Publication Date: 2026-06-30BYD CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
BYD CO LTD
Filing Date
2024-12-31
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

In existing technologies, the first catalyst may suddenly release a large amount of NOx when releasing NOx, causing some NOx to fail to react with the reducing agent and be released into the external environment, resulting in environmental pollution.

Method used

By using a return pipeline to divert at least a portion of the NOx released by the first catalyst to the engine, and by combining the switching between lean and rich combustion modes, the synergistic effect of multiple catalysts is utilized to convert and store NOx, thereby reducing the release of unreacted NOx.

Benefits of technology

By switching the return pipeline and catalytic converter mode, the amount of NOx released into the external environment that has not reacted with the reducing agent is reduced, thus reducing environmental pollution and improving fuel economy and power output.

✦ Generated by Eureka AI based on patent content.

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Abstract

This application relates to a control method, related equipment, and vehicle for an engine assembly. The engine assembly includes an engine, a first catalytic converter, and a return pipe. The engine has an intake end and an exhaust end. The first catalytic converter has an input end and an output end, with the input end connected to the exhaust end. The first catalytic converter is capable of storing or releasing NO at different times. X The reflux line has an inlet and an outlet. The outlet connects to the inlet, and the inlet connects to the outlet. The reflux line is used to return the NO released by the first catalyst. X At least a portion is diverted to the engine. This application aims to reduce NO release from the first catalytic converter. X The amount that flows into the external environment.
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