Invention Grant
US08495862B2 System and method for detecting low quality reductant and catalyst degradation in selective catalytic reduction systems
有权
用于检测选择性催化还原体系中低质量还原剂和催化剂降解的系统和方法
- Patent Title: System and method for detecting low quality reductant and catalyst degradation in selective catalytic reduction systems
- Patent Title (中): 用于检测选择性催化还原体系中低质量还原剂和催化剂降解的系统和方法
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Application No.: US12974366Application Date: 2010-12-21
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Publication No.: US08495862B2Publication Date: 2013-07-30
- Inventor: Stephen Paul Levijoki , Yue-Yun Wang , Brett B. Thompson
- Applicant: Stephen Paul Levijoki , Yue-Yun Wang , Brett B. Thompson
- Assignee: GM Global Technology Operations LLC
- Current Assignee: GM Global Technology Operations LLC
- Main IPC: F01N11/00
- IPC: F01N11/00
Abstract:
A control system for a selective catalytic reduction (SCR) system includes a conversion efficiency determination module, an ammonia slip determination module, and a diagnostic module. The conversion efficiency determination module determines a conversion efficiency of an SCR catalyst. The ammonia slip determination module determines an amount of ammonia slip across the SCR catalyst when the conversion efficiency is less than a predetermined threshold. The diagnostic module determines pass/fail statuses of a reductant supply and the SCR catalyst based on the amount of ammonia slip and at least one ammonia slip threshold.
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