摘要:
A sensing electrode for sensing a predetermined gas component of a measurement gas, which is provided in a mixed-potential gas sensor that measures the concentration of the predetermined gas component, is formed of a cermet containing a noble metal and an oxygen-ion conductive solid electrolyte. The noble metal comprises Pt and Au. An Au abundance ratio, which is an area ratio of a portion covered with Au to a portion at which Pt is exposed in a surface of noble metal particles forming the sensing electrode, is 0.3 or more.
摘要:
The invention relates to a reference electrode for galvanic cells comprising a combination of (a) titanium dioxide and an alkaline metal or alkaline earth metal titanate or (b) tin dioxide and an alkaline metal or alkaline earth metal stannate in intimate mixture.
摘要:
Dans ce procédé, l'électrode de mesure et la contre-électrode sont exposées au gaz d'échappement et présentent un ajustement qui entraîne alternativement des changements entre le régime riche et maigre. En outre, la contre-électrode est disposée en sorte que le temps d'activité et le temps mort lors du passage du gaz du régime riche au régime maigre s'écartent du temps d'activité et du temps mort lors du passage du gaz du régime maigre au régime riche. La contre-électrode présente donc des temps actifs asymétriques. On préfère utiliser une référence de régime riche dans laquelle l'intervalle de temps d'activité et l'intervalle de temps mort lors du passage du gaz du maigre au riche est plus court que lors du passage du riche au maigre. De plus, la contre-électrode est munie d'une couche antidiffusion qui présente des pores ayant des diamètres qui sont petits par rapport au libre parcours moyen des molécules d'oxygène. L'électrode de mesure ne fait donc pas des oscillations de boucle dans le sens riche vers maigre et engendre un potentiel quasi-constant qui peut servir de potentiel de référence pour la sonde.
摘要:
The sulfur oxides detection system 1 comprises: a device part 10 comprising a first electrochemical cell 51 having a first solid electrolyte layer 11, a first electrode 41, and a second electrode 42; and a diffusion regulating layer 16; a power supply 61 supplying voltage between the electrodes; a detector 62 detecting a first current correlation parameter; and a control part 80 controlling the power supply and acquiring the first current correlation parameter. The control part 80 controls the power supply so that a first voltage is applied between the electrodes and calculates a concentration of sulfur oxides in the measured gas based on the first current correlation parameter detected by the detector when the first voltage is applied between the electrodes, but it does not calculate the concentration of sulfur oxides in the measured gas when it judges that a concentration of water in the measured gas is not stable.
摘要:
Beschrieben wird ein Gassensorelement aufweisend eine Festkörperelektrolytzelle 4 mit wenigstens einem Festkörperelektrolytelement 2 und wenigstens zwei an sich gegenüberliegenden Oberflächen des Festkörperelektrolytelementes 2 angeordneten Elektroden 3.1, 3.2, nämlich wenigstens einer Referenzelektrode 3.1 und wenigstens einer Messelektrode 3.2. Die wenigstens eine Referenzelektrode 3.1 ist in einer Referenzkammer angeordnet, wobei zumindest ein Teil einer Wandung der Referenzkammer durch ein ein Keramiksubstrat 5 aufweisendes Heizelement gebildet ist. Die wenigstens eine Messelektrode 3.2 ist in einer das Messgas enthaltenden Messkammer angeordnet, wobei zumindest ein Teil einer Wandung der Messkammer in Form eines Feinfilters 9 zur Abtrennung von Schadgasen aus dem Messgas ausgebildet ist und die Messkammer ansonsten gasdicht gegen die Umgebung abgeschlossen ist. Das Feinfilter 9, das Festkörperelektrolytelement 2 und das Keramiksubstrat 5 des Heizelements sind in Form einer Sandwichstruktur übereinander angeordnet und durch Verbindungselemente 8 miteinander verbunden.
摘要:
This control device for an internal combustion engine includes: an exhaust purification catalyst (20) that is provided in an exhaust passage of the internal combustion engine; a downstream air-fuel ratio sensor (41) that is provided downstream of the exhaust purification catalyst; and an air-fuel ratio control device that controls such that the air-fuel ratio of exhaust gas flowing into the exhaust purification catalyst reaches a target air-fuel ratio. The downstream air-fuel ratio sensor is configured such that the applied voltage thereof at which the output current becomes zero decreases as the exhaust air-fuel ratio increases. If the target air-fuel ratio is richer than the reference air-fuel ratio, the voltage applied to the downstream air-fuel ratio sensor is set to a higher voltage than the voltage at which the output current becomes zero when the exhaust air-fuel ratio is the stoichiometric air-fuel ratio. If the target air-fuel ratio is leaner than the reference air-fuel ratio, the voltage applied to the downstream air-fuel ratio sensor is set to a lower voltage than the voltage at which the output current becomes zero when the exhaust air-fuel ratio is the stoichiometric air-fuel ratio. A control device for an internal combustion engine using an air-fuel ratio sensor that can reliably detect when the absolute value of the exhaust air-fuel ratio reaches a prescribed air-fuel ratio richer than the stoichiometric air-fuel ratio is thus provided.
摘要:
The invention relates to a reference electrode for galvanic cells comprising a combination of (a) titanium dioxide and an alkaline metal or alkaline earth metal titanate or (b) tin dioxide and an alkaline metal or alkaline earth metal stannate in intimate mixture.
摘要:
A sensing electrode for sensing a predetermined gas component of a measurement gas, which is provided in a mixed-potential gas sensor that measures the concentration of the predetermined gas component, is formed of a cermet containing a noble metal and an oxygen-ion conductive solid electrolyte. The noble metal comprises Pt and Au. An Au abundance ratio, which is an area ratio of a portion covered with Au to a portion at which Pt is exposed in a surface of noble metal particles forming the sensing electrode, is 0.3 or more.