Chemical apparatus and process disinfecting – deodorizing – preser – Analyzer – structured indicator – or manipulative laboratory... – Means for analyzing gas sample
Patent
1987-11-06
1990-09-18
Warden, Robert J.
Chemical apparatus and process disinfecting, deodorizing, preser
Analyzer, structured indicator, or manipulative laboratory...
Means for analyzing gas sample
123440, 123489, 204406, 20415316, 422 98, 436152, G01N 2716
Patent
active
049577050
ABSTRACT:
An oxygen gas concentration-detecting apparatus in an internal combustion engine using an alcohol fuel includes a ceramic substrate having one surface falling in contact with a reference gas and the other surface falling in contact with an exhaust gas of the engine and generating an electromotive force according to oxygen gas concentrations of both the gases. A pair of electrode members are arranged on the ceramic substrate to take out the electromotive force. A first oxidation catalyst layer is formed on the outer surface of the ceramic substrate to promote oxidation reaction of unburnt components. A laminate of a protecting layer of a metal oxide and a reduction catalyst layer of promoting reduction reaction of nitrogen oxides is formed on the outer surface of the first oxidation catalyst layer, and a second oxidation catalyst layer is arranged on the outer side face of the laminate to promote oxidation reaction of hydrogen gas. According to this apparatus, hydrogen gas is oxidized in the first oxidation catalyst layer and a bad influences by the differences of the diffusion speed between hydrogen gas and oxygen gas in the protecting layer are eliminated, the time of inversion of the concentration of oxygen gas inclusive of oxygen gas generated by reduction of nitrogen oxides can be precisely detected and discharge of nitrogen oxides is controlled with omission of a so-called EGR control device.
REFERENCES:
patent: 4535316 (1985-08-01), Wertheimer et al.
patent: 4773316 (1988-09-01), Uchikawa et al.
Abstract of Japan, 62-14055, published 6-16-87.
Japan Electronic Control Systems Co. Ltd.
Johnston Jill
Warden Robert J.
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