发明名称 |
IDENTIFICATION AND REJECTION OF ASYMMETRIC FAULTS |
摘要 |
Methods and systems are provided for identifying and rejecting asymmetric faults that cause engine emissions to be biased rich or lean. In one example, a method for an engine system comprises generating a UEGO sensor feedback set-point adjustment based on slower and faster time components within an outer loop of a catalyst control system; generating an inner-loop bias-offset correction from the slower time component; and indicating degradation of the engine system based on a comparison of the bias-offset correction to a degradation threshold. In this way, the total outer-loop control authority is increased while maintaining drivability and noise, vibration, and harshness (NVH) constraints and meeting emission standards in the presence of an air-to-fuel ratio biasing fault. |
申请公布号 |
US2015354485(A1) |
申请公布日期 |
2015.12.10 |
申请号 |
US201414299955 |
申请日期 |
2014.06.09 |
申请人 |
FORD GLOBAL TECHNOLOGIES, LLC |
发明人 |
Santillo Mario Anthony;Magner Stephen William;Uhrich Michael James;Jankovic Mrdjan J. |
分类号 |
F02D41/04;F02D41/22 |
主分类号 |
F02D41/04 |
代理机构 |
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代理人 |
|
主权项 |
1. A method for an engine system, comprising:
generating a UEGO sensor feedback set-point adjustment based on slower and faster time components within an outer loop of a catalyst control system; generating an inner-loop bias-offset correction from the slower time component; and indicating degradation of the engine system based on a comparison of the bias-offset correction to a degradation threshold. |
地址 |
Dearborn MI US |