Invention Grant
US09074541B2 Method and system for control of an EGR valve during lean operation in a boosted engine system
有权
在升压发动机系统中在稀薄运行期间控制EGR阀的方法和系统
- Patent Title: Method and system for control of an EGR valve during lean operation in a boosted engine system
- Patent Title (中): 在升压发动机系统中在稀薄运行期间控制EGR阀的方法和系统
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Application No.: US14063852Application Date: 2013-10-25
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Publication No.: US09074541B2Publication Date: 2015-07-07
- Inventor: Gopichandra Surnilla , Todd Anthony Rumpsa , James Alfred Hilditch , Timothy Joseph Clark , Ralph Wayne Cunningham , Julia Helen Buckland , Daniel Joseph Styles
- Applicant: Ford Global Technologies, LLC
- Applicant Address: US MI Dearborn
- Assignee: Ford Global Technologies, LLC
- Current Assignee: Ford Global Technologies, LLC
- Current Assignee Address: US MI Dearborn
- Agency: Alleman Hall McCoy Russell & Tuttle LLP
- Agent Julia Voutyras
- Main IPC: F01N3/00
- IPC: F01N3/00 ; F02M25/06 ; F01N3/10 ; F02B47/08 ; F02D41/00
Abstract:
Methods and systems are provided for reducing EGR estimation errors during lean engine operating conditions. During lean engine operation, EGR is disabled if the estimated exhaust air-fuel ratio becomes leaner than a lean threshold. The lean threshold is adjusted based on an upper limit of EGR errors that may be tolerated by the engine at a given engine speed and load.
Public/Granted literature
- US20150113948A1 METHOD AND SYSTEM FOR CONTROL OF AN EGR VALVE DURING LEAN OPERATION IN A BOOSTED ENGINE SYSTEM Public/Granted day:2015-04-30
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