Invention Grant
US08205435B2 Deterioration determination device for catalyst, catalyst deterioration determining method, and engine control unit
失效
用于催化剂的劣化测定装置，催化剂劣化确定方法和发动机控制单元
- Patent Title: Deterioration determination device for catalyst, catalyst deterioration determining method, and engine control unit
- Patent Title (中): 用于催化剂的劣化测定装置，催化剂劣化确定方法和发动机控制单元
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Application No.: US12482102Application Date: 2009-06-10
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Publication No.: US08205435B2Publication Date: 2012-06-26
- Inventor: Jun Iida
- Applicant: Jun Iida
- Applicant Address: JP Tokyo
- Assignee: Honda Motor Co., Ltd.
- Current Assignee: Honda Motor Co., Ltd.
- Current Assignee Address: JP Tokyo
- Agency: Arent Fox LLP
- Priority: JP2008/154214 20080612
- Main IPC: F01N3/00
- IPC: F01N3/00
Abstract:
A deterioration determination device for a catalyst, which is capable of accurately determining deterioration of a catalyst without being influenced by the response delays of outputs from the upstream and downstream oxygen concentration parameter sensors. The deterioration determination device includes upstream and downstream LAF sensors for detecting respective upstream and downstream oxygen concentration parameters. After switching exhaust gases flowing through the former parameter sensor into the catalyst to a reduction atmosphere, an upstream oxygen concentration parameter detected for comparison when a predetermined time period elapses after it exceeds a predetermined value is compared with a downstream oxygen concentration parameter detected for comparison when the predetermined time period elapses after it exceeds the predetermined value. Based results of the comparison, deterioration of the catalyst is determined.
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