Invention Grant
- Patent Title: Engine air to fuel ratio cylinder imbalance diagnostic
- Patent Title (中): 发动机空气比燃油比不平衡诊断
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Application No.: US14114048Application Date: 2012-04-25
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Publication No.: US09228523B2Publication Date: 2016-01-05
- Inventor: Brian Varney
- Applicant: Brian Varney
- Applicant Address: GB Whitley, Coventry, Warwickshire
- Assignee: Jaguar Land Rover Limited
- Current Assignee: Jaguar Land Rover Limited
- Current Assignee Address: GB Whitley, Coventry, Warwickshire
- Agency: Reising Ethington P.C.
- Priority: GB1107145.3 20110428
- International Application: PCT/EP2012/057572 WO 20120425
- International Announcement: WO2012/146620 WO 20121101
- Main IPC: B60T7/12
- IPC: B60T7/12 ; F02D41/24 ; F02D41/00 ; F02D41/14 ; F02D41/18

Abstract:
A diagnostic for identifying cylinder to cylinder air/fuel ratio faults of an engine having closed loop fuel control. Air mass flow is accumulated for a plurality of load bands on the engine load/speed map, and for each load band a rich/lean air fuel ratio is determined at a mass threshold. This threshold data is processed and compared with fixed data to determine whether any cylinder of an engine is experiencing an air/fuel ratio fault which is substantially different to the remainder.
Public/Granted literature
- US20140123943A1 ENGINE AIR TO FUEL RATIO CYLINDER IMBALANCE DIAGNOSTIC Public/Granted day:2014-05-08
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