内燃机的排气净化装置及其排气净化方法
By estimating the catalyst activity and adjusting the air-fuel ratio control strategy in the internal combustion engine exhaust purification device, the exhaust purification problem when the catalyst activity is low is solved, and the stability and purification effect of exhaust emissions are achieved.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TOYOTA JIDOSHA KK
- Filing Date
- 2023-06-07
- Publication Date
- 2026-07-17
AI Technical Summary
When the catalyst activity is low immediately after the internal combustion engine starts, the amount of hydrogen generated decreases, which leads to a deviation in the output of the downstream air-fuel ratio sensor and affects the purification effect of exhaust emissions.
By setting a catalyst state estimation unit in the exhaust purification device of the internal combustion engine, the catalyst activity is estimated based on parameters such as catalyst temperature and HC removal amount. The air-fuel ratio control strategy is adjusted by the air-fuel ratio control unit to make the target air-fuel ratio richer when the catalyst activity is low, so as to suppress the influence of hydrogen.
It effectively suppressed the deterioration of exhaust emissions caused by the influence of hydrogen and improved the purification performance of the catalyst, especially the exhaust purification effect when the catalyst activity is low.
Smart Images
Figure CN117404196B_ABST