Chemistry: electrical and wave energy – Apparatus – Electrolytic
Patent
1994-09-30
1996-08-27
Tung, T.
Chemistry: electrical and wave energy
Apparatus
Electrolytic
204426, 204427, 2057845, G01N 2726
Patent
active
055498043
ABSTRACT:
The invention is directed to an arrangement for detecting the oxygen content in the exhaust gas of an internal combustion engine. The arrangement includes a concentration measuring cell operating pursuant to the Nernst principle. The concentration measuring cell has a measuring electrode, a solid electrolyte and a reference electrode and a series circuit which includes a direct voltage source and a series resistor. The series circuit connects the measuring electrode to the reference electrode. The measuring electrode communicates with the exhaust gas of the internal combustion engine and is connected to the reference electrode via the solid electrolyte. The reference electrode communicates with the reference gas volume. The reference gas volume is partitioned from the exhaust gas and from the ambient air so that a particle exchange between the reference gas volume and the exhaust gas as well as between the reference gas volume and the ambient air is at least made more difficult. The output voltage of the concentration measuring cell defines a measure for the difference of the oxygen concentrations in the exhaust gas of the engine and the reference gas volume. The output voltage of the direct voltage source and/or the value of the series resistance is so pregiven that an electric current Ip is always so directed that oxygen is transported from the exhaust gas to the reference gas volume independently of the output voltage of the concentration measuring cell. The current Ip flows in a current circuit including direct voltage source, series resistance and concentration measuring cell.
REFERENCES:
patent: 4207159 (1980-06-01), Kimura et al.
patent: 4464244 (1984-08-01), Uchida et al.
patent: 4498968 (1985-02-01), Yamada et al.
patent: 4755274 (1988-07-01), Mase et al.
patent: 5028309 (1991-07-01), Nishizawa et al.
Hotzel Gerhard
Neumann Harald
Riegel Johann
Strassner Walter
Ottesen Walter
Robert & Bosch GmbH
Tung T.
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