SOx concentration detection apparatus
A technology for concentration detection and concentration, which is applied in the direction of measuring devices, instruments, scientific instruments, etc., can solve the problems of inability to detect with high precision
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no. 1 Embodiment approach
[0063] Hereinafter, an SOx concentration detection device (hereinafter, sometimes referred to as "first device") according to a first embodiment of the present invention will be described with reference to the drawings.
[0064] (structure)
[0065] The SOx sensor included in the first device is arranged in an exhaust passage (exhaust pipe) of the internal combustion engine. Such as figure 1 As shown, the element part 10 of the SOx sensor includes a first solid electrolyte body (first solid electrolyte layer) 11s, a first alumina layer 21a, a second alumina layer 21b, a third alumina layer 21c, a fourth alumina layer 21d, the fifth aluminum oxide layer 21e, the diffusion resistance body (diffusion resistance layer, diffusion rate control layer) 32, and the heater 41.
[0066] The first solid electrolyte body 11s is a thin plate body made of zirconia or the like and having oxide ion conductivity. The zirconia forming the first solid electrolyte body 11s may contain elements...
no. 2 Embodiment approach
[0141] Hereinafter, a SOx concentration detection device (hereinafter sometimes referred to as "second device") according to a second embodiment of the present invention will be described.
[0142] (structure)
[0143] The element part 20 of the SOx sensor that the 2nd device is equipped with except the point that also has the 2nd electrochemical unit (pump unit 12c) that is arranged side by side in the vicinity of the 1st electrochemical unit (pump unit 11c), has the same features as the first device. The element part 10 has the same structure. The "nearby" here refers to a region where the test gas containing water at a concentration equal to the concentration of water contained in the test gas reaching the first electrochemical cell 11c arrives. In addition, in the following description, the configuration of the second device will be described focusing on differences from the first device.
[0144] Such as Figure 12 As shown in (a) and (b), the element unit 20 of the SO...
no. 3 Embodiment approach
[0197] Hereinafter, an SOx concentration detection device (hereinafter sometimes referred to as "third device") according to a third embodiment of the present invention will be described.
[0198] (structure)
[0199] Such as Figure 20 As shown in (a), the element unit 30 of the SOx sensor included in the third device is provided on the upstream side of the first electrochemical unit (sensor unit 11c) and the second electrochemical unit (monitor unit 12c) ( The third electrochemical unit (pump unit 13c) on the side of the diffusion resistor 32) has substantially the same structure as the element unit 10 included in the second device. Therefore, below, the configuration of the third device will be described with particular attention to the differences from the second device.
[0200] The element unit 30 of the third device does not have Figure 12 The first alumina layer 21a shown includes "the second solid electrolyte body 12s, the sixth alumina layer 21f, and the first al...
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