JPS60142241A - Gas detecting sensor provided with heater - Google Patents

Abstract

PURPOSE:To use a titled sensor in a wide operating range without providing a temperature compensating thermistor in the vicinity of a gas detecting element by isolating a gas detecting sensor provided with a heater so that a temperature difference is generated between the sensor and a resistance for executing voltage division around a split point of said resistance. CONSTITUTION:In a voltage dividing resistance 7, a resistance pattern between 9a and 9b is brought closer to a heater G than that between 9b and 9c. R1, R2 and R3 are 6, 6 and 65OMEGA, respectively. In case when a voltage of 12V is applied between 9a-9c (AC), a resistance value of the voltage dividing resistance 7 is changed, and also by a variation of a temperature of an exhaust gas, a voltage applied to a titanium element 19 is varied. As for G corresponding to R1, a position of the pattern is separated from R2, therefore, it is no influenced so much by heating of R1. In this way, this sensor can be used in a wide working temperature range without providing a temperature compensating thermister in the vicinity of a gas detecting sensor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical field] The present invention [jl, gas-sensitive lens 4J-1] Specifically, the gas-sensitive lens 4J-1 is a device for heating a gas-sensitive element of a gas-sensitive lens.

Conventional technology 1 Generally, (for the surface force, 'l':!>
+ It is roughly divided into two types: main type and catalytic combustion type.

Semiconductor-type sensing sensor (Yo31) When a υ gas comes into contact with a bubble 14-, the electrical resistance of the body changes. There are also those who can detect the presence of a person.

On the other hand, the catalytic combustion type senka hinley is platinum ;(''-
A catalyst was placed at
Using the change in electrical resistance of the platinum wire, we can detect the reaction (scorching) caused by the reaction (scorching) heat that occurs in a product, and use the change in electrical resistance of the platinum wire to determine the presence of gas or the concentration at 1!?

Also, Sn O2, /+10, T' i 02 , Co
A single-layer solution using an oxide such as
By selecting the type, 12J constant gas can be detected such as gas-sensitive Renly 1, CO pan 102, or humidity sensor.

However, the heater is often hit by Mori Kaspin 1 no (well, C mashi).The way to get rid of it is to burn off the dirt that has been shielded, or (rirega) It is used to increase stiffness or the activity of a casus-sensitive element by 6.

In order to detect a change in the resistance of the sensing wire r, it is convenient to apply a known voltage to the external power source J and detect the current flowing through it as a change in the comparison resistance.

1 (The power supply voltage applied to this gas-sensitive element and the power supply voltage used for the heater are not necessarily the same, and two types of power supplies are often used in eight roles.) There was a problem with making the strikes too expensive.

For example, white e medium 111 gas 02 tonly smell - (
is l'i 02 , Co O, Sn 02 ':'
By knowing the resistance changes of the oxide T body, IJ)
It is possible to know whether the gas composition is higher or lower than the stoichiometric air-fuel ratio by feeding back the Ren υ-output (electrical Gi) to determine the stoichiometric air-fuel ratio ( = 21 in a narrow range near 1 ~ 1
] - enables a 7-way catalyst to be used at a high rate of 1
The IJI gas system has a fuel ratio of 1,000,000,000,000, and 1,000,000. In this case, the 02 Renly has a cold engine ++, j % of 1 No. 1 gas starvation is i o o 'c
]・(Since I do not perform this operation for a certain period of time,
It is said that it is desirable that the 02 Renley-IJ heater be combined with the IJ heater. However, the power source for the heater is a battery. It is convenient to use (12 V or 2/1), and it is desirable to have 11 heaters. On the other hand, 0
The resistance detection power supply for the 2-lens-4-no-kawato λ-sensitive element preferably has an element durability of -1-1 to 5V, and in this case two types of power supplies were required.

Furthermore, J in 1- below, the gas sensing cumulative r for detecting resistance changes.
Another problem with the lifting platform that uses this is that it depends on the resistance value of the gas-sensitive wire itself. Immediately, the measured resistance value includes gas concentration, rumono, etc., and when used in a wide range of grades, Hinley's Decrease detected viscosity. For this reason, in addition to the gas (Mori 1 + 1ji element), it has been done to reduce the 1'l by using the ? ”S[-ha^
ri 4 “ru.

[Invention 1] Target 1 The purpose of the tree 5u light was asked by the tree inventors, etc., and was previously indicated.
This Relamic also applied metallization technology in the first tube, and by applying the Lamic heater to the gas-sensitive element (1 cow's good sensitivity, immediately H) 1; +7
In Application No. 51-ε36868, J1 Lumina was printed on the surface of a lamic sheet using a well-known thick film metal lining method, and then printed with a 100% pattern. j-bu (alumino and right (mixture with substitute fat) ('+vine roux 1 shuffle i ---f
) are pasted together and dried in a high IP atmosphere.
In a sensitive sensor using a ceramic heater, a single resistor pattern for voltage division is installed in parallel with the heater pattern of the ceramic heater. , -7 I! A heater that made it possible to use source C (cl to the qg sensitive gas sensor), the voltage of the voltage dividing resistor pattern, 1 phi out 4 change of the resistor pattern on both sides of the 431 point, 4 between the two.
If a temperature difference is set (J, it is divided because the temperature coefficient of the positive resistance or temperature coefficient is 1), the electric current can be changed by drying, this product? 1?The hardness of the gas-sensitive element in the nature - output '17j (!ldo1
1. By having a tendency to warp, the plate 1 of the gas-sensitive element
To reduce the degree-dependent bamboo 111; The heater of
Lit E+ No. 8-104.622 (hereinafter referred to as the "Prior Invention")]; However, the present invention is intended to further achieve the above objects from another aspect. 1, that is, the structure of the present invention includes a gas-sensitive element whose mountain resistance changes by 11 depending on the gas component (1α), and a lamic 1!11 hole that holds the gas-sensitive resistance. Then, the corresponding Lamic J11 (4 (to, the resistor for the heating element A, the heater river) 1 (resistance) J is applied? Ti source power) - 1 is divided 71 :iΣ1 dividing resistor, and the corresponding ?t
i I ■ - Between the resistances on both sides of the dividing point (, - I crystal 1 (L
;Rika]1ShiruJ,・), i:Lj 8 at a predetermined interval 1
hll b (Installation J / here and 1 jr tli evening 4 rudimentary one tar included! Tangas Renley is the gist and C.

[fruit! Local example I Jsu I Niho 572 l! IJ 4 ahead 11 techniques 1・[・1
The embodiments will be explained in half (with the drawings) while comparing them.

The present invention is described in I and IJ first 1i (!
Since J4 is the same, '/L 'J', for Sakigake 1 Komei (Explanation 7, Fig. 1 [Well, this invention C - the heater resistor used? lX 1.- 1-minute 111
It also represents the print 1-pattern 1 of the resistor for 1. 1 In the figure, 3 is a 300 μ thick green J-' made of alumino powder and resin. , 5 is green-
7-P 3' tangeslan garuki k 1-'f l1fi Pi to cellulose resin J to metal rice paste:
7 is a printed heater resistor. [1] Printed bar division (1 (represents resistance). 9a, 9b,
9e is the same ≦ metallized base + J, U l 11
Sushi 1. X electrode, 11 is the part unl of the electric lamp dividing resistor 7, which is connected to the lead wire pattern from the electric ij 9 c.
It expresses k. In addition, in the circuit diagram of the pain 12 diagram (,
The aforementioned electrodes 9a and 9e are respectively connected to the pattern of the heater resistor 5: l'l Lua Ji, source supply no end rA,
C'a, electric lit 91. + LJ, 2> H+, 1
1. : terminal for output of electric j ■] 3, division point 11 is connected Ha
Resistance 1 + 't l + (t I + 1, electric 4 fi
The resistance value between 9a and 9b is R2, electric +4i 9 b-90
The resistance between 1+f1 is [3,: 11 for strainer (
The heat generating part of b'+5 should be specially designated as G5. .

The clean tape 3 is printed with an outer diameter of 1+ as shown in Figure 3 and Figure 4C. (4Φ) inside l-
It has a 2/7 hole 13 of 2N-L8Φ) and is molded from alumino powder dobural resin. l = Ceramic world holiday body ti! Wrap around tube 7-15-1 and heat to 11500'C during humidification.
Group E gets +1.

In this example, C uses nine oxide halves, and one M R1 fi is opened and disclosed by one person.
6-350'Iε3 bow publication, cass sensing element using titan j), 1411 '5,th', -+ lql +
Knee display yJ 11', 7i (plane 1?i ('), 5
nr/g L7. 1) Mix a platinum powder with a specific surface area of 1++r/2J to the Lr type Ditani 17 powder, and insert the two electrode wear parts 117a and 17b into the pellet.
Tania element 19 is used.

Next, Fig. 5 shows the heater of this example.
11. In the figure, 27 is a metal outer coos, and 29 is fitted or screwed into the side coos 27. The metal group 1 le 11 clasp, J31, is fitted into one end of the joint 29.
The screw 33 is used to set the P series 25 to the device under test.
11 metal fittings engraved, 35 = 1 metal fittings 3) Ei 1
0;Kire IJ Kasuke 1~. 37 is closed with a Sue Unres etc., and the waste introduction hole is closed, and the main metal fitting 33j3 is 1j〉 (shielded and 2nd 2'') is covered with a cover for protecting the tip, 4'I a i+:i[)A i
c represents the lead wire;
1', l, 453 and solder the small 1 part to the 2/full wire 1 f: I (t, - 2' wire 451. L knee 3 holes I 1'?J insulation 1) 10 ) f lead h 'I through the hole 6 to the electrode 98, and also the lead ♀11j'+11
1 is 49 and the J part is 'Nirakure i! 49 Nirou (
T+! -J, the same nickel wire 71≦) is injected into the hole 133 in the insulator tube 15 through the plate 46, and then soldered to the electrode wire 17a of the element 19.
), and the lead wire 711C is nickel wire 5!' shown at 53;
-)ltRaikoku℃]
In addition, the Nitsuru wire 5) 7 is brazed () to the electrode 91) of the pudding 1-pattern 1, and the leek/full wire;) 57 is 1
11 is inserted into the hole 13 of the tube 15, and the
1, which is connected to the electric rod wire 17b of FIG. It expresses “being”.

The nickel wires 49 and 57 are inserted into the insulator tube '1 iJ, -1: gold (', + inserted into the shaft core of 31, inside the joint 29) += ito1 heat (!, 1 (1 ) Remen 1-59
The lead wires /11J1 to /11c are fixed to
Series 11M G' with electrical insulation of V4
I - (I side 27 inside C Aino insulated 41 hard) i
The output is the lead t! ii/'111) to the outside.

1/2: Previously, the state of use was tJ6-3. The diagram is shown in Figure 18.
I, [de2, [ma3,]ku0's 1ift l;L 6 each
．． It is assumed to be 5.65Ω and 50KO.

The results of the experiment in this case are shown below using the Renly-25 constructed as described above.

First, set the Sen 4 No 25 to 2 [[1 (Electric fuel injection q
・1) Shielding was carried out during the noise backup system due to the control engine's 02 and 4 no. At this time, 1 in Figure 2
There is an output of 1■ between 3 and Δ.
250 c's head, 1j1 scum is rich in the armpit (Masaku)
), 8V, in the case of lean, approximately OV and (.L is;
It was the first time that the Song Dynasty was 111 years old. Also, when the IJI sword gets high, the output in the rich case is about 0.9V
Is it the output of the lean lifting platform of Tomoko 1/j Rushino?-L 'A'
L/, lit 10,000s 800" (1: c approx. 0.
4V and 41, the operating range is \1) Autumn < 7e and can withstand practical use. The following experiment 1111 is shown in FIG. 9 (indicated by the dotted line).

-1) In the case of the first 11 Komei's Bj7-C, the output when lean is increased by 41' when the II sword scum 11 is accumulated. In order to clarify the reason for this, Figure 10 shows Titani i'
Krr internal resistance during rich/lean conditions (U series-11
Indicates (anti).

In the publication 'S High School (Akira n;'r), there is a series of examples of lean cases.
1 resistance (represented by the 1 dotted line in Figure 10) is lower than the fixed resistance R (J K Q (solid line)). Since the ratio with the Renly resistance (comparison resistance/1"-resistance) 'C- is determined, the output in the lean state is i'!l < If. At low temperatures, the Renly resistance in the rich case becomes the broken line J,) It becomes extremely high. This is because the element's confusion suddenly falls. Therefore, the output of lip 11,) is 2
Ei O'C falls.

Next, an embodiment of the present invention will be explained. In the present invention (1), by changing the prior invention described in (1), Jj t, J run line 1 to pattern 1, there is a further modification 1ITh6l-)1. , :1. ) of (-1゜Fig.
\, Among the voltage dividing resistors 7, compare between 9a and 9b\,
The resistance pattern between 9b and 9e is close to the same tar G f = IL
J 'Cit'). Moreover, the equal hlli circuit is the same as in FIG. 2, and R+, 172, R3 are connected to each node Z, 6.
It is 6.65Ω.

Like this 9a -9c (to A) rose 7 and layer 1i
When applying 12 V, the resistance 1i of the voltage dividing resistor 7
9a −91+ (R
2) voltage changes as shown in Figure 12, and output changes as shown in Figure 13.For comparison,
In Figures 2 and 13, the lifting mill of the earlier application is also shown to be smaller.

VBA-Invasion 4-1.18V Compared to the previous B case, it was an indefensible 'l bI! The reason why the I'l-Δ voltage in the + example changes as shown in FIG.

Tanks Den Metal Rice is resistance i! ll! The average temperature is approximately +0.40%/℃, which is a positive 1lli. △ in Figure 2
Mark the battery voltage between 111 and J and R+ le
t, acts as a heater, generates heat and its own resistance value,
jl,, it becomes. In this case, in Fig. 11, ``O which corresponds to ≧ 1'' and resistor R2 are far apart from each other by about IN of the pattern. However, in contrast, when Ra is close to 1 < 1, C'J + t1 degree increases, and as with 1 Te 1, the resistance fi ■, L increases 1, from 250 to 80
At 0℃, 1<+, 3 at l is about 21Q high<<K
Le (7) Ni'14 L/, R2 is 1. ]i3 There was a change C in the culm. Further, the voltage 1'v13A between B and Δ and the Renley output Vs are expressed by the following formula.

This I and Vllll8 are 4 times as shown in the graph (b) of FIG. 12, and the Renly output VSI;L becomes as shown in FIG. 13. This is due to the synergistic effect of Figures 12 and 10. When connecting this Renly to a feedback circuit, set the comparison level (J, this) as shown in Figure 13. Depending on whether the relay output is high or low, there is a control output that is output.It is understood that the lens of the present invention can operate within a range of 1 mm compared to conventional products. Ru.

Therefore, by using the heater made of tungsten metallization and a part of the heater resistor 5 in the embodiment of the present invention, the temperature difference on both sides of the voltage dividing resistor 7 is utilized. (In the case of: j + + 1 degree sleeve (1) without using the master, it can be operated in a wide range of preparation areas, and the safe 1 + l Ii 18 reliable 02 Renley (j ( It becomes possible to do C.

The Relamic 11 of the present invention may be a flat plate instead of a tubular one. In addition, as shown in FIG. 14, for example, alumino 4i 1t265 a
,6! ') A resistor C36 and a heater 67 are arranged on the terminal electrode 6B using platinum paste, and on the other hand, a resistor C36 and a heater 67 are installed on the terminal electrode 6B for the terminal voltage (-j, U b
J, yes. Furthermore, in the figure, r:69 indicates a through ball. In Figure 1/I, the beam plates are shown at 21f in a and b.
Divide fj & lZ and add both fr + lfi'i <;
+ 11> There is a type C, but it is formed using the front and back sides of one L4 board.

1 Effects of the Invention 1 The present invention has been explained in detail in the examples and compared with the examples, such as the heater f=1 of the present invention.
In this case, the resistor that performs the voltage division is centered around the dividing point, and a temperature difference occurs between the two stones (J, -).
It has a septum.

Therefore, according to the present invention, it is possible to use -C for a wide operating leakage range even without a conventional heater (like the Morikasu-Hinley model), which is equipped with a 1α compensating glue mister placed near the waste sensing element. It becomes Noh.

[Brief explanation of the drawing]

Figure 1 is a plan view showing the print 1 pattern of the green tape printed with the heater resistor and voltage divider single resistor used in the prior invention, and the in 2 figure is the printed pattern 1 [η The road map and Figure 3 are of the same embodiment. Page 1, Figure 5 shows the Ditanino element r used in the example with a small slant? 1. ! Figure, 0! (Figure 3 shows the heater-equipped knife according to the embodiment of the present invention.
Figure 7 is a perspective view schematically showing the part, Figure 8 is the connection section in the usage state of I-141, Figure 9 is a graph showing the results of the experiment in the earlier application, and Figure 10 is a diagram showing the results of the experiment in the previous application. The figure is a graph showing changes in Kenley resistance, and Figure 11 is Example Pudding 1.
Fig. 12 is a graph comparing the 13-∆ electric box of the embodiment, Fig. 13 is a graph showing the Renley output of the embodiment, and Fig. 14 is a graph showing the Renley output of the embodiment. The U1 of the present invention
1.1-1.1-2... Pudding 1 to Pattern 5... FIG.
Resistor for resistor N(+) 7...Resistance for voltage division (Rz, Ra)≦)a, 91
), 9...electrode 15...fl [ノ? ! (19... Butanino 7 chord (gas-sensitive chord) 2b... Heater (=l き き 感 連 り だ 類人 連 連 Ｇ Ｇ Ｇ Ｇ Ｇ Ｇ Ｇ Ｇ Ｇ Ｇ Ｇ Ｇ Ｇ Ｇ Ｇ Ｇ Ｇ sec 1 fig. 214 3 rd [ 1 40 th 5 Figure 9 77a 77b Figure 7 9 Figure 81゛1 47a yb 1廿n゛nuwo艮degree 10Figure 411 I n''s 3 5 claws Figure 11 Figure 12↑ Figure 13 4 Strength temperature 14 Figures (a) (b)

Claims (1)

[Scope of Claims] 1. A gas-sensitive element whose electrical resistance value changes depending on the gas component j3 and its concentration, a Relamic carrier that holds the gas-sensitive element, and the plamin 910 body. A heater resistor that divides the power supply voltage applied to the heater resistor, and a voltage divider resistor that divides the power supply voltage applied to the heater resistor;
In addition, the two must be isolated for a specified length of time. 2 The heater resistor and voltage dividing resistor are ceramics containing tungethrane, molybdenum and/or platinum,
Rinaru'4? Jff't Claim 1! The heater described in Section 1 of II (N1-sensing element r) is an oxide semiconductor J, Rinaru fr i'l
The range of crystallization required is the heating gas described in item 1.
4. The gas-sensitive element is made of an oxide half-bow body containing titania (see claim 1) or (also, the heater ζ13-sensing element described in the third revision. 5. The gas-sensitive element is made of a pellet-shaped (J thick film ('Claim 8'F Claims 1, 33, or W!/lIΩ
The heater F4 described is a gas Hinley.