Invention Grant
- Patent Title: Air-fuel ratio imbalance determination apparatus and air-fuel ratio imbalance determination method
- Patent Title (中): 空燃比不平衡确定装置和空燃比不平衡确定方法
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Application No.: US13754227Application Date: 2013-01-30
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Publication No.: US09279377B2Publication Date: 2016-03-08
- Inventor: Takeshi Genko
- Applicant: Takeshi Genko
- Applicant Address: JP Toyota-shi
- Assignee: Toyota Jidosha Kabushiki Kaisha
- Current Assignee: Toyota Jidosha Kabushiki Kaisha
- Current Assignee Address: JP Toyota-shi
- Agency: Dinsmore & Shohl LLP
- Priority: JP2012-020065 20120201
- Main IPC: B60T7/12
- IPC: B60T7/12 ; F02D41/00 ; F02D41/14 ; F02D41/24

Abstract:
An air-fuel ratio imbalance determination apparatus for a multi-cylinder internal combustion engine includes an air-fuel ratio sensor with a catalyst layer disposed in an exhaust passage of the multi-cylinder internal combustion engine; and a control unit configured: to perform determination regarding an air-fuel ratio imbalance state among cylinders of the multi-cylinder internal combustion engine based on an amount of change per unit time in an air-fuel ratio detected by the air-fuel ratio sensor; to execute an air-fuel ratio enrichment control using an air-fuel ratio enrichment amount; and to correct a learned imbalance value when the air-fuel ratio enrichment amount is smaller than a predetermined determination threshold value in a case where an engine operation state is in an imbalance learning range during execution of the air-fuel ratio enrichment control.
Public/Granted literature
- US20130197782A1 AIR-FUEL RATIO IMBALANCE DETERMINATION APPARATUS AND AIR-FUEL RATIO IMBALANCE DETERMINATION METHOD Public/Granted day:2013-08-01
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