Catalyst State Observation via the Perturbation of a Microwave Cavity Resonator

被引：38
|
作者：
Fischerauer, Gerhard [1 ]
Spoerl, Matthias [1 ]
Gollwitzer, Andreas [1 ]
Wedemann, Marion [2 ]
Moos, Ralf [2 ]
机构：
[1] BERC, Fac Engn Sci, Chair Measurement & Control Engn, D-95440 Bayreuth, Germany
[2] BERC, Fac Engn Sci, Chair Funct Mat, D-95440 Bayreuth, Germany
来源：
FREQUENZ | 2008年 / 62卷 / 7-8期
关键词：
Three-way catalyst; TWC; state observation; in situ; cavity resonator; perturbation;
D O I：
10.1515/FREQ.2008.62.7-8.180
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
The state of the three-way catalyst (TWC) of a gasoline engine is commonly estimated by measuring the air-to-fuel ratio in the exhaust gas. This indirect method suffers from several disadvantages that one could avoid by directly observing the catalyst state and in particular its oxygen loading. We have investigated an RF approach to this direct measurement problem which is based on the fact that the TWC and its stainless steel canning form a filled cavity resonator. It will be shown that the resonator is perturbed when the TWC changes its conductivity as a function of oxygen loading and that the characteristics of the resonator S-parameters mirror the oxidation/reduction state of the catalyst.
引用
收藏
页码：180 / 184
页数：5
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