KR100252417B1 - Automobile for using a temperature detective apparatus - Google Patents

Abstract

PURPOSE: A vehicle using a temperature detecting apparatus is provided to control accurately and sensitively corresponding to detected temperature of exhaust gas by installing the temperature detecting apparatus improving heat responsiveness in the exhaust gas passage of the vehicle. CONSTITUTION: A temperature detecting apparatus comprises a first metal pipe(5); first and second metal wires(3) accommodated in the first metal pipe, and composed of at least one end projected from the end of the first metal pipe; an insulator(4) for keeping electric insulation of the first metal pipe and the first and second metal wires inside the first metal pipe; a temperature detecting element(2) projected out of one end of the first metal pipe and disposed between ends of the first and second metal wires; and a metal cap(1) fitted to the end of the first metal pipe for covering the temperature detecting element. The temperature detecting element is longer in the direction between the first and second metal wires than in the direction at right angle thereto, and a portion of the metal cap opposite to the temperature detecting element is in a flat shape in the same direction in a shape similar to the temperature detecting element.

Description

Automobile for using a temperature detective apparatus

The present invention relates to a motor vehicle using a temperature detection device used to perform temperature detection in various places.

In automobiles, a catalytic purifier is installed in the exhaust gas path to make an effort to purify the exhaust gas. In order to maximize the performance of the catalytic purifier, it is necessary to detect the exhaust gas temperature to the exhaust gas by the temperature detector.

In the conventional temperature detecting device, as shown in Figs. 19 to 23, the metal pipe 26 and the metal pipe 26 are housed in at least one end thereof from one end of the metal pipe 26. The electrical insulation of each of the two protruding first and second metal wires 27 and the metal pipe 26 and the metal pipe 26 and the first and second metal wires 27 is maintained. A cylindrical temperature detecting element 29 provided between the insulator 28 and one end of the first and second two metal wires 27 protruding out of the one end of the metal pipe 26, and the temperature detecting element. The metal cap 30 is fitted to one end of the metal pipe 26 so as to cover the 29.

It is known that the temperature detection element 29 is most sensitive to temperature at the portion between the first and second two metal wires 27. However, in the above-described conventional configuration, since the cylindrical temperature detecting element 29 is arranged in the coaxial shape in the cylindrical metal cap 30, the first and second elements of the temperature detecting element 29 Since the portion between the two metal wires 27 is located at a position away from the outer surface of the metal cap 30, the detection of heat transmitted from the outer surface of the metal cap 30 is insensitive, resulting in poor thermal response characteristics. .

An object of the present invention is to provide a motor vehicle using a temperature detection device having good thermal response characteristics.

BRIEF DESCRIPTION OF THE DRAWINGS The front view which showed half of the temperature detection apparatus in one Embodiment of this invention in cross section.

2 is an enlarged side cross-sectional view of a temperature detecting element portion of the apparatus;

3 is an enlarged front cross-sectional view of a temperature detecting device portion of the apparatus;

Fig. 4 is a top view of the temperature detecting element of the temperature detecting device in one embodiment of the present invention.

5 is an elevation view

Fig. 6 is a side view of the terminal fixing body of the temperature detection device in one embodiment of the present invention.

7 is a statue cross-sectional view

8 is a perspective view of a vehicle using the temperature detection device of the present invention

Fig. 9 is an enlarged side cross-sectional view of a temperature detecting device portion according to another embodiment of the present invention.

10 is a front sectional view in which the same temperature detecting element is enlarged;

11 is a front view of another embodiment of the present invention.

12 is an ipsilateral cross-sectional view

13 is a cross-sectional view taken along the line A-A of FIG.

Fig. 14 is a top view of a temperature detecting device of still another embodiment of the present invention.

15 is an elevation view

16 is a front view of another embodiment of the present invention.

17 is a cross-sectional view of the ipsilateral side

18 is a cross-sectional view taken along the line B-B of FIG.

19 is a front view showing half of a conventional temperature detection device in cross section;

20 is a side sectional view of a conventional temperature detection element unit;

21 is a front sectional view of a conventional temperature detection element unit;

22 is a top view of a conventional temperature detection device.

23 is a front view of a conventional temperature detecting element.

<Description of the symbols for the main parts of the drawings>

1: metal cap 1a: convex portion

1b: projection 2: temperature detecting element

2a: thermistor 2b: electrode

2c: recess 3: metal wire

4: insulator 5: first metal pipe

5a: recess 6: weld

8: Relay terminal 9: Terminal fixed body

10: lead wire 11: storage hole

12: rib 13: through hole

14: partition part 17: connection part

18: waterproof tube 19: metal fixing plate

20: drawing section 21: end section

22: laser welding 23: lead wire protection tube

24: mounting screw 25: gasket

26: metal pipe 27: metal wire

28: insulator 29: temperature detecting element

30: metal cap

In order to achieve this object, the present invention has a shape in which the temperature detecting element has a flat shape in which the length of the first and second metal wire directions is longer than the length of the right angle direction, and opposing portions of the temperature detecting element of the metal cap. The temperature detecting element is almost similar in shape to a flat shape in the same direction.

This configuration makes it possible to arrange the two intermetallic portions which mainly detect heat of the temperature detecting element at a position close to the side of the metal cap, whereby the heat can be detected sensitively, thereby improving the thermal response characteristics. .

The temperature detecting device used in the present invention includes a first metal pipe, first and second metal wires housed in the first metal pipe, and at least one end thereof protrudes from one end of the first metal pipe; An insulator for maintaining electrical insulation of each of the first metal pipe, the first and second metal wires in the first metal pipe, and one end of the first and second metal wires protruding out of one end of the first metal pipe. A temperature detecting element provided between the portions, and a metal cap fitted to one end of the first metal pipe so as to cover the temperature detecting element, wherein the temperature detecting element is provided between the first and second metal wires; Direction length is longer than the length in the right angle direction, and the temperature detection element opposing portion of the metal cap is substantially similar to the temperature detection element and has a flat shape in the same direction. As the device, the thermal response characteristic is improved as described above.

The temperature detection device is the temperature detection device described above in which the front obstruction end is flattened from the opening end fitting the outer end of the first metal pipe of the metal cap to the first metal pipe. There is no need, and a general cylindrical thing can be utilized, not only can cost be suppressed, but also strength can be fully maintained.

The temperature detecting device is the above-described temperature detecting device in which the opening end of the metal cap is plastically deformed to the first metal pipe to form a small diameter, and the metal cap and the first metal pipe are welded in the small diameter part. In this small diameter portion, the metal cap and the first metal pipe are brought into contact with each other in the small diameter portion, and as a result, the welding state of both ends is also stabilized, whereby the temperature detecting element in the metal cap is stabilized. The airtightness from the external atmosphere is promoted and the protection is performed.

The temperature detection device is the above-described temperature detection device in which the opening of the metal cap is expanded from the closed end toward the opening, and the metal cap can be fitted to one end of the first metal pipe. It becomes.

The temperature detecting device is the temperature detecting device described above in which the front side of the metal cap is gradually flattened toward the occlusion end from the fitting portion of the metal cap to the first metal pipe. The side is different from the one where the metal cap is directly evaluated, and the fall of the insulation resistance due to the proximity of the distance between the metal cap and the first and second metal wires at one end of the metal pipe can be prevented.

The temperature detection device is a temperature detection device in which the metal cap is gradually thinned from the opening toward the closure portion, and the temperature detection element heats up faster by thinning the closed portion of the metal cap containing the temperature detection element. In this respect, the thermal response performance can be improved, and such a thin thickness can be easily formed by tightening the metal cap.

The temperature detection device is the temperature detection device described above in which at least one of the metal cap and the first metal pipe is heat-treated at a temperature higher than the maximum temperature used before welding the metal cap and the first metal pipe. As a result of forming a strong oxide film on the cap or the surface of the first metal pipe, the oxide film is formed by depriving oxygen in the temperature detecting element during use, or unnecessary gas is released from these metal caps or the surface of the first metal pipe. This does not deteriorate the characteristics of the temperature detection element.

The temperature detecting device is the temperature detecting device described above in which a convex portion is formed at one side of the first metal pipe and a metal cap, and a concave portion at which the convex portion is fitted at the other side. It can be attached correctly to the flat temperature detection element, and the damage of the temperature detection element does not occur, and the improvement of the thermal response performance obtained by the combination of the flat phases is not impaired.

The temperature detecting device is a temperature detecting device in which a recess is formed between the first and second metal wires of the flat temperature detecting device, and the surface of the temperature detecting device is formed by forming a recess on the surface of the temperature detecting device. It is possible to prevent a significant drop in the insulation resistance between the metal wire and the metal cap that occurs as a result of contacting the inner surface of the metal cap.

The temperature detection device is a temperature detection device in which a projection is formed on a flat portion of the metal cap facing the temperature detection element, and protrudes toward the temperature detection element. Although contact with the furnace temperature detection element occurs, no contact is made in the surface state, and therefore, a significant reduction in the insulation resistance between the metal cap and the metal wire can be prevented.

Moreover, the 1st invention of this invention is an automobile provided with the said temperature detection apparatus in an exhaust gas furnace, and can perform various various controls corresponding to the exhaust gas temperature detected by the temperature detection apparatus with the excellent thermal response performance. It becomes.

According to a second aspect of the present invention, there is provided a temperature detecting device in which the width direction (longitudinal direction) of the flat temperature detecting element with respect to the exhaust gas passage coincides with the direction of the flow of the exhaust gas. In automobiles, since exhaust gas flows through both of the flat first metal pipes, the first metal cap receives heat in a large area, and as a result, the heat response performance can be made better, Appropriate control can be performed.

EMBODIMENT OF THE INVENTION Hereinafter, embodiment of this invention is described, referring drawings.

As shown in Figs. 1 to 3, the temperature detection device is accommodated in the first metal pipe 5 and the first metal pipe 5, and at least one end thereof is formed of the first metal pipe 5; First and second two metal wires 3 protruding from one end and the first and second metal wires 5 and 3 in the first metal pipe 5. A flat temperature detecting element provided between the insulator 4 holding each electrical insulation and one end of the first and second metal wires 3 protruding out of one end of the first metal pipe 5. (2) and a metal cap (1) fitted to one end of the first metal pipe (5) so as to cover the temperature detecting element (2). (3) is two metal wires with a diameter of 0.3 mm, and the cylindrical first metal pipe 5 having an outer diameter of 2.8 mm is disposed around the whole except for both ends of the two metal wires 3, and the metal wires 3 The insulator 4 made of MgO is filled between the first metal pipe 5 and the first metal pipe 5 to form a two-core pipe. A temperature detecting element 2 having a flat shape as shown in Figs. 4 and 5 is connected to each of one ends of the two metal wires 3 as shown in Figs. 2 and 3 so as to accommodate the temperature detecting element 2. The opening of the user-cap-shaped metal cap 1 with one end closed is fitted to the outer periphery of the one end of the said 1st metal pipe 5. The metal cap 1 is made of a material of SUS310S having a thickness of 0.5 mm, and the opening thereof is cylindrical, but the closed end portion thereof corresponds to the shape of the temperature detecting element 2 as shown in Figs. It is flat. The opening of the metal cap 1 is fitted to the outer circumferential portion of one end of the first metal pipe 5, and the first metal pipe 5 and the metal cap 1 are welded by laser welding 6. It is joined to the circumference and the airtight inside the metal cap 1 is ensured. Here, the metal cap 1 was flat as mentioned above, the width direction (longitudinal direction) was 3.8 mm, and the thickness direction was 2.9 mm. As shown in Figs. 4 and 5, in the temperature detecting element 2, two tubular electrodes 2b made of platinum are embedded in the flat demister 2a. 2b penetrates through the thermistor 2a. That is, it arrange | positioned so that the center axis | shaft of the thermistor 2a part and the center axis | shaft of the electrode 2b may be parallel. The temperature detecting element 2 has a flat shape in which the length (width) in the first and second metal wire directions is longer than the length (thickness) in the right angle direction, and the width direction (long direction) is 2.4 mm and the thickness direction is used. It was set as the flat shape of 1.5 mm. 2 and 3, the metal wire 3 penetrates inside the electrode 2b of the temperature detecting element 2 and is electrically connected by welding at the tip of the electrode 2b. The thickness direction of the flat temperature detection element 2 is accommodated so as to correspond to the thickness direction of the flat metal cap 1.

Table 1 shows the thermal response characteristics of the temperature detector according to the present embodiment and the characteristics of the conventional temperature detector.

Response time Part Name Review Sample Composition Item Material Dimension This embodiment 10 to 11 seconds Metal wire (3): 0.3 mm diameter primary metal pipe (5): outer diameter 2.8 mm metal cap (1): material SUS310S: thickness 0.5 mm: long axis outer dimension 3.8 mm: short axis outer dimension 2.9 mm temperature detection element (2 ): Long axis dimension 2.4 mm: Short axis dimension 1.5 mm Conventional example 28-30 seconds Metal wire (27): Diameter 0.5 mm Metal pipe (26): Outside diameter 4.8 mm Metal cap (30): Material SUS310S: Thickness 0.5 mm: Outside diameter 6.0 mm Temperature detection element 29: Outside diameter 3.6 mm Measurement condition: Insert the temperature detector which is stable at 25 ℃ in the electric furnace maintained at 1000 ℃ and measure the time until the temperature detector displays 641.3 ℃.

As can be seen from Table 1, the thermal response time is long (28-30 seconds) in the conventional example, but is short (10-11 seconds) in the present embodiment. Reduction of heat capacity by miniaturization of the metal wire 3, the insulator 4, the first metal pipe 5, the metal cap 1 and the temperature detecting element 2, and the closed end of the metal cap 1 is flat It is achieved by making the cross sectional flat shape of the said temperature detection element 2 accommodated in the space of this metal cap 1, and can ensure the thermal response performance of 11 seconds or less. If the heat response characteristic is less than 11 seconds, it can be sufficiently applied to the use for the exhaust gas purification system.

Next, as shown in FIG. 1, each of the other ends of the metal wires 3 is electrically connected to one end of the lead wire 10 via the relay terminal 8. As shown in Figs. 6 and 7, the two relay terminals 8 are integrated in the terminal fixing body 9 with their tip portions bent at right angles. The terminal fixing body 9 is formed of an insulating resin, and at the distal end thereof, a receiving hole 11 into which the other end of the first metal pipe 5 is inserted is formed, and the first metal is formed in the receiving hole 11. When the other end of the pipe 5 is inserted, the four ribs 12 shown in FIG. 7 formed on the inner surface are deformed, and the other end of the first metal pipe 5 is fixed by the action. In other words, the rear end of the first metal pipe 5 is press-fitted into the accommodation hole 11. In addition, two through holes 13 are formed in the storage hole 11 of the terminal fixing body 9, and a partition portion 14 is formed therebetween, and the through hole is directed toward the partition portion 14. The tip end of (13) was made into a shape to expand. That is, after the rear end of the metal wire 3 is separated from the partition portion 14, respectively, it passes through the respective through holes 13 along the inclination, and is extruded on the respective relay terminals 8, respectively. In the relay terminal 8 portion where the metal wire 3 is extruded, two welded portions 15 and 16 having different lengths are disposed as shown in FIG. These weld parts 15 and 16 are formed by extruding the relay terminal 8 at a predetermined interval on the surface side. Therefore, when the metal wire 3 extruded here is subjected to resistance welding, the welding resistance in these welding portions 15 and 16 becomes higher than when the welding portions 15 and 16 are integrated, and the respective welding portions are higher. The welding resistance of (15) and (16) is different, and the part which has two types of welding strength can be obtained, and the structure which is reliable and rich in redundancy can be obtained. The tip of the lead wire 10 is fixed to the connecting portion 17 of the rear end of the relay terminal 8 by welding.

The tip ends of the two relay terminals 8 and the two lead wires 10 are respectively accommodated in two through holes of the waterproof tube 18 made of rubber material in order to ensure waterproofness. Next, the waterproof structure will be described. The tip of the waterproof tube 18 abuts the rear end of the terminal fixture 9, as shown in FIG. 1, and the outer periphery of the portion is 0.3 mm thick. The metal fixing tube 19 made of aluminum thinner than the bimetallic pipe 7 is attached. In this case, as shown in Fig. 1, the second metal pipe 7 located at the tip end side of the terminal fixture 9 has a drawing diameter with a smaller diameter at the tip end than the terminal fixture 9, and as a result, As a result, the distal end of the terminal fixing body 9 abuts on the stepped portion of the second metal pipe 7. Therefore, when the drawing process is performed such that the second metal pipe 7 located at the rear end of the metal fixing tube 19 is made to have a small diameter over the entire circumference, as shown in FIG. The terminal fixing body 9 is pressed against the end 21 and fixed through the fixing tube 19. In this state, the inside of the waterproof tube 18 is compressed by the drawing unit 20, thereby compressing the outer skin of the drawing unit 20, the waterproof tube 18, and the lead wire 10. In addition, the end of the small diameter portion of the second metal pipe 7 is located in the outer peripheral portion of the first metal pipe 5, as shown in Fig. 1, and both of them are fixed by laser welding 22, and airtight. Is also secured. By these, the inside of the 2nd metal pipe 7 is aimed at waterproofing. Moreover, according to the structure which fixes the terminal fixing body 9 to the 2nd metal pipe 7, even if the tension force is applied to the lead wire 10, the relay terminal 8 integrated with the terminal fixing body 9 is carried out. Therefore, no force is applied to the thin metal wire 3 having a diameter of 0.3 mm, which is less than or equal to 10 kgf (98N), and therefore, the wire is not disconnected.

In addition, the rear end portion of the metal fixing tube 19 is deformed in part by the drawing portion 20, but the waterproof tube 18 is provided inside thereof, and the portion corresponding to the deformation portion is the lead wire 10. Since it is to the outer shell tip of the, the contact with the relay terminal 8 never occurs.

In Fig. 1, reference numeral 23 denotes a tube for protecting lead wires. Reference numeral 24 denotes a mounting screw attached to the second metal pipe 7. The mounting screw 24 is used to mount the temperature detecting element 2 in contact with a high temperature exhaust gas. 25 is a gasket at that time.

FIG. 8 shows that the temperature detection device A is installed in the catalytic purifier unit of the vehicle exhaust gas furnace B, and corresponds to the exhaust gas temperature detected by the temperature detection device A having good thermal response characteristics. The controller C can perform appropriate control.

In addition, the installation method of the temperature detection apparatus A is provided so that the width direction (longitudinal direction) of the temperature detection element of flat shape with respect to the exhaust gas path B may correspond with the direction of the flow of exhaust gas. In this way, the first metal cap 1 receives heat in a large area, and as a result, its heat response characteristics can be made better, and more appropriate control can be performed in an automobile.

9 and 10 show another embodiment, which shows a temperature detecting device in which the opening of the metal cap 1 is expanded from the closed end side toward the opening. The metal pipe 5 can be easily fitted to one end of the metal pipe 5.

9 and 10 show a temperature detection device having a shape in which the front side of the metal cap 1 is gradually flattened toward the occlusion end thereof rather than the fitting portion of the metal cap 1 to the first metal pipe 5. The first metal pipe 5 is different from the one with which the metal cap 1 is directly evaluated at one end of the first metal pipe 5, and the first metal pipe 5 is made of the metal cap 1 and the first and the first ones. It becomes possible to prevent the fall of insulation resistance by the distance of the metal wire 3 of 2 approaching too much.

9 and 10 show that the metal cap 1 is gradually thinned from the opening toward the occlusion portion, and the occlusion portion of the metal cap 1 containing the temperature detecting element 2 is gradually formed. This thinness makes it possible to transfer heat to the temperature detecting element 2 more quickly, and in this respect, the thermal response characteristics can be improved, and such thin thickness can be easily formed by drawing and processing the metal cap 1. Can be.

11 to 13 show another embodiment, in which the convex portion 1a is fitted to one side of the fitting portion of the metal cap 1 and the first metal pipe 5, and the convex portion 1a is inserted to the other side thereof. As the concave portion 5a is formed to be fitted, the flat metal cap 1 can be properly mounted on the flat temperature detecting element 2 similarly by the uneven fitting. Not only does the damage of 2) occur, but the thermal response characteristics obtained by the combination of the flat shapes are not impaired.

14 and 15 show another embodiment, wherein recesses 2c are formed in the temperature detection element 2 portion between the first and second metal wires 3, and the temperature detection element 2 By forming the recessed portion 2c on the surface, the recessed portion 2c does not come into contact with the inner surface of the metal cap 1, and the surface of the temperature detecting element 2 is placed on the inner surface of the metal cap 1 with the surface state. It is possible to prevent a significant drop in the insulation resistance between the metal wire 3 and the metal cap 1 generated as a result of contact.

16 to 18 show another embodiment, in which a flat portion of the metal cap 1 facing the temperature detecting element 2 is provided with a protrusion 1b protruding toward the temperature detecting element 2. By forming the protrusion 1b in the metal cap 1 in this way, the protrusion 1b is in contact with the temperature detecting element 2 in a pointed state, even if it occurs, so that the metal cap 1 does not come into contact with the surface state. It is possible to prevent a significant drop in the insulation resistance between (1) and the metal wire 3.

At least one of the metal cap 1 and the first metal pipe 5 is preferably heat-treated at a temperature higher than the maximum temperature used before welding the metal cap 1 and the first metal pipe 5 to each other. Do. By the heat treatment, a strong oxide film can be formed on the surface of the heat treated metal cap 1 or the first metal pipe 5. In general, when a metal is heated in an exhaust gas, the metal takes oxygen from the surroundings and oxidizes or releases gas adsorbed on the surface. However, the degree of oxygen removal and surface adsorption gas release from the surroundings is very small compared to the original metal surface. As a result, during use, oxygen in the temperature detecting element 2 is taken away to form an oxide film, or unnecessary gas is released from the surface of the metal cap 1 or the first metal pipe 5 so that the temperature detecting element 2 The problem of deteriorating the characteristics of can be prevented.

Although the temperature detection device has been described in detail with respect to the application to automobiles, it goes without saying that various applications are possible. For example, when used in a liquid or a gas, it can be used as a temperature detection device excellent in thermal response. Moreover, various modifications are possible besides this invention. Accordingly, all modifications existing within the true spirit and scope of the present invention are included in the claims.

As described above, according to the present invention, a vehicle using a responsive temperature detection device can be provided, and by installing the device in an exhaust gas path of the vehicle, appropriate control in response to the detected exhaust gas temperature can be sensitively performed. The effect which can be performed can be obtained.

Claims (2)

In the first metal pipe, the first and second metal wires, which are accommodated in the first metal pipe and at least one end thereof protrudes from one end of the first metal pipe, are disposed in the first metal pipe. Temperature formed between an insulator for maintaining electrical insulation of each of the first metal pipe, the first and second metal wires, and one end of the first and second metal wires protruding out of one end of the first metal pipe. A detection element and a metal cap fitted to one end of the first metal pipe so as to cover the temperature detection element, wherein the temperature detection element has a length at right angles between the first and second metal lines; The temperature detection device having a flat shape longer than the length in the direction and having a flat shape in the same direction as the temperature detection element in the metal cap, wherein the temperature detecting device opposing portion is provided in the exhaust gas passage. Vehicles using detectors. The motor vehicle according to claim 1, wherein the temperature detecting device is provided so that the width direction (longitudinal direction) of the flat temperature detecting element coincides with the direction of the flow of the exhaust gas with respect to the exhaust gas passage.