Gas concentration detection apparatus
A technology for gas concentration detection and equipment, applied in mechanical equipment, electrical control, measuring devices, etc., to achieve high accuracy
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no. 1 approach
[0102] [Structure of the first embodiment]
[0103] First, refer to figure 1 The configuration of the gas concentration detecting device according to the first embodiment of the present invention will be described. figure 1 is a diagram illustrating the configuration of the gas concentration detection device 10 according to the first embodiment. figure 1 The shown gas concentration detecting device 10 is a NOx concentration detecting device which detects, for example, nitrogen oxides (NO X )concentration.
[0104] The gas concentration detection device 10 includes a NOx sensor 1 . The NOx sensor 1 is formed by sequentially stacking a spacer 3 , a NOx sensor unit 4 , another spacer 5 , and a heater 6 below the oxygen pump unit 2 .
[0105] The oxygen pump unit 2 is capable of removing excess oxygen from a measurement target gas, and includes a solid electrolyte body 21 , a first pump electrode 22 , and a second pump electrode 23 . The solid electrolyte body 21 is sandwiche...
no. 2 approach
[0155] will now refer to Figure 7 to Figure 9 A second embodiment of the present invention will be described. when using figure 1 The hardware configuration shown enables the ECU 8 to perform Figure 9 When the program described later is shown, the gas concentration detecting device according to the second embodiment is realized.
[0156] [Features of the second embodiment]
[0157] The first embodiment described earlier locates an inflection point based on, for example, a comparison between the NOx sensor cell output change amount ΔN(t) and a reference value ΔNth, and forms an activity judgment about the NOx sensor 1 when the inflection point occurs.
[0158] Meanwhile, the oxygen pump unit 2 is configured the same as the NOx sensor unit 4 . The output of these cells is in the oxygen ion O 2- The value of current they have when flowing into them. Therefore, there is a correlation between the oxygen pump cell output and the NOx sensor cell output. The second embodiment...
no. 3 approach
[0182] will now refer to Figure 12A with Figure 12B A third embodiment of the present invention will be described. The first embodiment described earlier forms an activity judgment about the NOx sensor 1 when an inflection point occurs in the output of the NOx sensor cell. Therefore, it should be preferable to obtain the NOx sensor cell output whose inflection point can be easily located.
[0183] Therefore, the third embodiment will be described with specific reference to the configuration of the NOx sensor 1 that makes it easy to locate the inflection point in the output of the NOx sensor cell. Figure 12A with Figure 12B is a diagram illustrating the configuration of the NOx sensor 1 according to the third embodiment. More specifically, Figure 12A is a cross-sectional view of NOx sensor 1, and Figure 12B is a plan view of the heater electrode 61 in the NOx sensor 1 .
[0184] Such as Figure 12B As shown, the width W1 of the heater electrode 61 on the side faci...
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