KR20180076721A - oxygen sensor with laser trimming resistance plate - Google Patents

Abstract

The present invention relates to an oxygen sensor having a laser trimming resistance plate, capable of repeatedly and easily replacing and mounting or exchanging a pattern resistance plate. The oxygen sensor comprises: a replaceable pattern resistance plate (20, 21, 22, 23) produced by forming, by using a performance inspector and a laser trimming apparatus (10), a trimming pattern (30, 31, 32, 33) on a resistance plate base material (1) to correspond to a target resistance value, so that current output from a sensor body (100) of the oxygen sensor is constant; a cable (200) extended from the sensor body (100); and a mounting module (300) electrically connected to the cable (200) and finishing a replacement plate entrance (331) of the pattern resistance plate (20, 21, 22, 23) by a separable resistance plate cap (340) such as to replaceably mount or detach the pattern resistance plate (20, 21, 22, 23).

Description

TECHNICAL FIELD [0001] The present invention relates to an oxygen sensor with a laser trimming resistance plate,

The present invention relates to an oxygen sensor having a laser trimming resistance plate, and more particularly, to an oxygen sensor equipped with a laser trimming resistive plate, and more particularly, to an oxygen sensor mounted on an exhaust manifold or an exhaust pipe of a vehicle, So that the cost of disposing of the finished product can be reduced in the performance test or product development stage and the pattern resistive plates can be easily mounted or exchanged with the finished product alternately. Sensor.

Generally, a sensor is an information element that detects and collects a physical quantity of a measurement target, and converts it into a signal readable by an observer or a device.

Of these sensors, an oxygen sensor may be mounted on the exhaust system of the vehicle.

The oxygen sensor according to the related art may include a power input terminal, a sensing unit, a heater unit, and a signal output terminal inside the sensor body, or may include a resistance plate electrically connected to a signal output terminal.

The oxygen sensor is made of a Zirconia-based device that generates an electromotive force according to a difference in oxygen concentration and a titania-based device whose resistance changes according to a difference in oxygen concentration.

Zirconia type oxygen sensor does not supply the reference voltage separately due to the electromotive force generation and the generated electromotive force is not so high so that the output signal is changed from 0 volts to 1 volt to the electronic control unit Output. For example, the sensing portion of the oxygen sensor of the vickonia series is composed of a solid electrolyte having oxygen ion conductivity, such as a ceramic material mixed with zirconium oxide and yttrium oxide.

Titania-based oxygen sensors use a characteristic that the resistance changes according to the oxygen concentration, so that a reference voltage (eg, 5 volts) is supplied to change the resistance change to the signal voltage. This reference voltage changes depending on the resistance, .

The oxygen sensor is operated at a certain temperature (eg 300 to 600 ° C.) of the exhaust gas, and the temperature of the tip of the sensing part is heated to about 700 ° C. by the heater part of the oxygen sensor. If the temperature is too high (eg above 900 ° C), the oxygen sensor may fail.

In particular, the oxygen sensor of the prior art has a resistance plate for keeping the output current of its sensor body constant.

As a conventional technique, a metal resistance trimming apparatus disclosed in the following patent document repeats a process of irradiating laser light, measuring a resistance value, and moving a laser light irradiation position until a resistance value reaches a target value, And terminating the cutting of the metal resistor by irradiation of the laser light when the voltage reaches the predetermined voltage.

However, the prior art provides only a technique of repeatedly measuring or cutting a part of the resistance plate using laser technology, and there is no means for easily replacing and detaching the manufactured resistance plate with the oxygen sensor Therefore, many trial and error occur in the product development stage of the oxygen sensor, and a very high product development cost is required.

Japanese Patent Application Laid-Open No. 2000-114011

It is an object of the present invention to provide a mounting module capable of repeatedly replacing or replacing a pattern resistive plate made by a performance testing machine and a laser trimming apparatus, The pattern resistive plate that is laser-trimmed to correspond to the target resistance value can be easily mounted or separated in the mounting module and the cost of development, testing, and production of the oxygen sensor can be relatively reduced, The present invention provides an oxygen sensor having a laser trimming resistance plate that can easily test product performance or product characteristics of an oxygen sensor while selectively replacing any one of the oxygen sensor and the oxygen sensor.

According to an aspect of the present invention, there is provided an oxygen sensor including a laser trimming resistive plate according to the present invention, wherein a performance checker and a laser trimming apparatus are provided with a trimming pattern A patternable resistive plate made of a resistive plate material; A cable extending from the sensor body; And a mounting module that is electrically connected to the cable and closes the replacement plate door of the pattern resistive plate with a detachable resistive plate cap to interchangeably mount or detach the pattern resistive plate.

The end of the cable of the cable is electrically connected to the fork pin located inside the mounting module with respect to the opposite end of the sensor body.

The mounting module includes a first end electrically connected to the cable through an electric wire and a second end extended from the first end toward the pattern resistive plate and then contacted with the upper surface or the bottom of the pattern resistive plate. A fork pin having a forked other end that branches into openings; A housing cap for a connector into which an end of the one end of the fork pin is inserted; A housing accommodating the fork pin and the housing cap for the connector, the housing having a plate entry / exit opening toward the pattern resistance plate, the other end of the forked form being exposed through the plate entry / exit; And a resistance plate cap closing the plate entry / exit port after the pattern resistance plate is fitted into the gap of the forked other end of the fork pin through the plate entry / exit port.

The mounting module includes a cover seal which is located inside the resistance plate cap and contacts the end of the pattern resistor plate opposite to the fork pin.

The resistance plate cap includes: a cap body having a hollow cross-section enclosing the cover seal; And a ring-shaped elastic body formed integrally on both sides of the outer circumferential surface of the cap body and each extending toward the fastening protrusions formed on both sides of the housing.

The engaging projection of the housing may be formed with a chamfer portion having an inclined surface with respect to a portion in contact with the elastic body portion so as to bend the elastic body portion of the resistance plate cap when the housing and the resistance plate cap are coupled have.

The fork pin forms contact protrusions that protrude from one another at the other end of the fork type so that point contact can be made with respect to the bottom surface or the top surface of the pattern resistive plate.

The fork pin forms an English V-shaped stopper portion at a branch starting point of the other end of the fork type so as to prevent excessive insertion of the pattern resistive plate.

Wherein the pattern resistive plate has a linear first trimming pattern which is opened at one side of the pattern resistive plate and is not opened at the other side and a second trimming pattern which is parallel to the first trimming pattern and has a relatively short or long length A third trimming pattern having a letter L shape bent at right angles at an end of the first trimming pattern, and a third trimming pattern arranged in parallel with the third trimming pattern and the first trimming pattern And a trimming pattern corresponding to one of the fourth trimming patterns of one shape.

In the oxygen sensor having the laser trimming resistive plate according to the present invention, the laser trimming is progressed in accordance with the target resistance value so that the pattern resistive plate having any one of the trimming patterns of the various types of trimming patterns is mounted on the mounting module It is possible to relatively reduce the development, testing, and production costs of the oxygen sensor.

The mounting module of the oxygen sensor having the laser trimming resistive plate according to the present invention comprises a housing cap, a housing, a fork pin, and a resistance plate cap for a connector so that the pattern resistance plate can be replaced. , The pattern resistance plate can be easily separated from the resistance plate cap.

1 is a perspective view illustrating a performance tester and a laser trimming apparatus for an oxygen sensor having a laser trimming resistance plate according to an embodiment of the present invention;
2 is a front view of an oxygen sensor with a laser trimming resistance plate that can detach or attach the resistance plate fabricated by the performance tester and laser trimming equipment shown in Fig.
Figure 3 is an exploded perspective view of the mounting module shown in Figure 2;
4 is a perspective view showing an end portion of the housing in which the resistance plate shown in Fig. 3 is fitted.
5 is an exploded perspective view for explaining a coupling relation of the resistance plate, the housing, and the resistance plate cap shown in FIG. 3;

BRIEF DESCRIPTION OF THE DRAWINGS The advantages and features of the present invention and the manner of achieving them will become apparent with reference to the embodiments described in detail below with reference to the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. And is provided to fully illustrate the scope of the invention to those skilled in the art, and the invention is defined by the claims.

It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In the present specification, the singular form includes plural forms unless otherwise specified in the specification. &Quot; comprises " and / or "comprising" when used in this specification is taken to specify the presence or absence of one or more other components, steps, operations and / Or add-ons. Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

1 is a perspective view illustrating a performance tester and a laser trimming apparatus for an oxygen sensor having a laser trimming resistance plate according to an embodiment of the present invention.

Referring to FIG. 1, according to the present embodiment, various replaceable pattern resist plates 20, 21, 22, and 23 to be described later refer to a laser trimming resistive plate mounted on or electrically connected to an oxygen sensor.

The performance tester for the oxygen sensor and the laser trimming apparatus 10 are configured to calculate a target resistance value after receiving a plurality of resistance plate base materials 1.

At this time, the resistance plate base material 1 is individually mounted in a state of being electrically connected to a performance checker and a mount electrode provided inside the laser trimming apparatus 10. [

Then, during the laser trimming process for the resist plate base material 1, the target resistance value can be measured in real time in the performance tester and the laser trimming equipment 10.

In addition, when the real-time measurement value reaches the target resistance value, the laser trimming operation of the performance tester and the laser trimming apparatus 10 can be terminated. Through this process, various kinds of pattern resistance plates 20, 21, 22, and 23 can be made.

The oxygen sensor 100 to be described with reference to FIG. 2 must include any one of a plurality of pattern resistors 20, 21, 22, and 23 so that an output current can be uniformly generated.

When the oxygen sensor 100 is actually fabricated and tested, it is necessary to selectively use or replace one of the various types of pattern resistance plates 20, 21, 22, 23 that is suitable for the target resistance value.

The pattern resistance plates 20, 21, 22, and 23 may have any one of the various types of trimming patterns 30, 31, 32, and 33 described below for the purpose of changing the target resistance value.

For example, the pattern resistance plates 20, 21, 22, and 23 may be formed of any one of the first trimming pattern 30, the second trimming pattern 31, the third trimming pattern 32, and the fourth trimming pattern 33 .

The first trimming pattern 30 is opened at one side of the pattern resistive plate 20 and is formed in a linear shape that is not opened at the other side.

The second trimming pattern 31 is formed in two parallel straight lines having a relatively short or long length in parallel with the first trimming pattern in the other pattern resistance plate 21. [

The third trimming pattern 32 is formed in a letter L shape bent at a right angle at the end of the first trimming pattern in another pattern resistive plate 22. [

The fourth trimming pattern 33 is formed in a shape in which the third trimming pattern and the first trimming pattern are arranged in parallel in another pattern resistance plate 23. [

Due to such a pattern difference, each of the pattern resistors 20, 21, 22, and 23 is made to be able to make the output current of the oxygen sensor constant, and can be selected and used by the user.

The positions at which the trimming patterns 30, 31, 32 and 33 are formed in the respective pattern resistance plates 20, 21, 22 and 23 are determined by the following fork pins 310 and pattern resistance plates 20, 21, 22, 23 can be in contact with each other.

FIG. 2 is a front view of an oxygen sensor having a laser trimming resistance plate capable of detaching or attaching a resistance plate manufactured by the performance tester and the laser trimming equipment shown in FIG. 1, and FIG. 3 is a front view of the oxygen sensor, Fig. FIG. 4 is a perspective view showing an end portion of the housing in which the resistance plate shown in FIG. 3 is inserted, and FIG. 5 is an exploded perspective view illustrating the coupling relationship of the resistance plate, the housing, and the resistance plate cap shown in FIG.

2, the present embodiment includes a sensor body 100 as an oxygen sensor, a cable 200, a mounting module 300, a pattern resistive plate 30 having a trimming pattern 30 of any of the above- 20).

The performance resistance tester 20 and the laser trimming apparatus 10 described above with reference to FIG. 1 previously set the trimming pattern 30 to correspond to the target resistance value so that the output current of the sensor body 100 of the oxygen sensor is made constant. To the resistance plate base material (1).

The cable 200 may be formed of connecting means or wires for electrically connecting the sensor body 100 and the mounting module 300.

That is, the cable 200 extends from the sensor body 100 and is electrically coupled to the mounting module 300.

The mounting module 300 serves as a connector for connecting the oxygen sensor to the electronic circuit of the vehicle, and has a feature of also using the attaching / detaching means of the pattern resistance plate 20, which will be described later.

That is, the mounting module 300 is electrically connected to the cable 200, and the resistive plate cap 340 is connected to the pattern resistive plate 20 so as to replaceably mount or detach the pattern resistive plate 20. And the replacement plate entrance / exit 331 is closed. Here, the resistance plate cap 340 is configured to be detachable from the plate entry / exit port 331 due to a detailed configuration (for example, an elastic body portion 342 and a fastening protrusion 332) as described later.

Referring to FIG. 3, the cable 200 is connected to the inside of the mounting module 300, that is, the mounting module 300 And is electrically connected to the fork pin 310 located inside the housing 330 of the main body 310. [

The mounting module 300 includes a fork pin 310 of a conductive or metallic material, a housing cap 320 (e.g., a 6-pin double lock cap) for a connector each molded of an insulating material, a housing 330, (340).

The fork pins 310 may be formed of two or more than two, depending on design changes.

Each of the fork pins 310 includes an end portion 311 electrically connected to the cable 200 through a wire and an end portion 311 that is integrally bent from the end portion 311 and extends toward the pattern resistance plate 20, Shaped other end 312 branched into two so as to be in contact with the upper surface or the lower surface of the pattern resistive plate 20.

Each of the fork pins 310 forms contact protrusions 313 protruding from each other at the other end 312 of the fork type so that point contact can be made with respect to the bottom surface or the top surface of the pattern resistive plate 20 have.

A gap between the contact protrusions 313 may be included in the clearance of the forked other end portion 312.

Each of the fork pins 310 is formed with a V-shaped stopper portion 314 at the branch start point of the forked other end portion 312 to prevent excessive insertion of the pattern resistive plate 20 .

That is, during the coupling between the pattern resistive plate 20 and the fork pin 310, the pattern resistive plate 20 is slidably moved in contact with the contact protrusion 313, but the shape of the V-shaped stopper portion 314 It is possible to stop and fix it by means of the characteristic features.

Of course, when the user pulls the pattern resistance plate 20 with the fingertip in the opposite direction of insertion of the pattern resistance plate 20, the pattern resistance plate 20 is separated from the forked other end 312 of the fork pin 310 .

In addition, the detailed shape and size of each fork pin 310 other than the above-described shape may vary depending on the type and size of the mounting module 300, and thus may not be limited to a specific shape.

The housing cap 320 for a connector has a shape in which an end of the one end portion 311 of the fork pin 310 is inserted. The housing cap 320 for the connector can be formed in a shape that can be fastened in correspondence with the socket shape of the vehicle to be electrically connected to the oxygen sensor, that is, a shape that can serve as a connector.

The housing 330 houses the fork pin 310 and the housing cap 320 for the connector and has a plate entrance 331 opened toward the pattern resistance plate 20. 4, the forked other end 312 of the fork pin 310 is exposed through the plate entrance 331 of the housing 330. [

3, the resistive plate cap 340 is inserted into the gap of the forked other end 312 of the fork pin 310 through the plate entry / exit port 331 , And closes the plate entrance / exit (331).

3, the mounting module 300 is located inside the resistance plate cap 340 and includes a cover seal 340 contacting the end of the pattern resistance plate 20, which is opposite to the fork pin 310, 350 (cover seal). The cover seal 350 may be made of an insulating material, a rubber material, or a silicon material, and may be in close contact with the surface of the end of the pattern resistive plate 20. [ At this time, even if an external force or shock that may occur during the movement of the vehicle is transmitted to the mounting module 300, the pattern resistance plate 20 may be in contact with the cover chamber 350 or may be elastically supported by the cover chamber 350 Therefore, the pattern resistive plate 20 may not swing or flow inside the resistance plate cap 340 or inside the plate entrance 331.

5, the resistance plate cap 340 includes a cap body 341 having a hollow cross-section enclosing the cover chamber 350 shown in FIG. 3, and a plurality of resistive plate caps 340 formed integrally on both sides of the outer circumferential surface of the cap body 341 And a ring-shaped elastic body portion 342 extending toward the fastening protrusions 332 formed on both side surfaces of the housing 300.

Each of the resilient body couplings 342 is made of the same material as the resilient plate cap 340 and extends toward the fastening protrusions 332 of the housing 300 so that the resilient body couplings 342 have elasticity due to their extension length and material, And can be restored again after being bent at the cantilever structure.

The thickness or position of the fastening protrusion 332 may be designed to correspond to the inner diameter and the position of the elongated hole 343 of the elastic body coupling portion 342 of the resistance plate cap 340, respectively.

Each of the fastening protrusions 332 of the housing 330 may be formed to bend the elastic body part 342 of the resistance plate cap 340 when the housing 330 and the resistance plate cap 340 are coupled to each other. , And a beveled portion 333 having an inclined surface shape is formed on the basis of a portion in contact with the elastic body coupling portion 342.

Referring to FIG. 5, the operator or the oxygen sensor developer can perform the performance test of the oxygen sensor with the pattern resistive plate 20 mounted on the mounting module 300.

As a result of this performance test, the output current from the oxygen sensor may not be constant. In the conventional case, the entire tested oxygen sensor (for example, the sensor body, the cable and the connector) is discarded and the other oxygen sensor is mounted again. However, in the present embodiment, the resistance plate cap 340 is mounted on the housing 330 The conventional pattern resistive plate 20 is removed and only the new pattern resistive plate 22 is replaced and then the resistance plate cap 340 is coupled to the housing 330. Thus, The performance test can be easily performed without disposal of the entire oxygen sensor.

Thus, the present embodiment can provide maximized usability in which the pattern resistance plates having various resistance values are manufactured through laser trimming, and then the product resistance test can be performed by alternately mounting or replacing the pattern resistance plate on the finished product, In the case of laser trimming failure, it is not necessary to dispose of the finished pattern and to close only the pattern resistive plate, so that the resource consumption required for manufacturing the oxygen sensor can be minimized.

The foregoing description is merely illustrative of the technical idea of the present invention and various changes and modifications may be made without departing from the essential characteristics of the present invention. Therefore, the embodiments described in the present invention are not intended to limit the scope of the present invention, but are intended to be illustrative, and the scope of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas which are equivalent or equivalent thereto should be interpreted as being included in the scope of the present invention.

20, 21, 22, 23: pattern resistance plates 30, 31, 32, 33: trimming patterns
100: Sensor body 200: Cable
300: mounting module 310: fork pin
320: housing cap 330: housing
340: Resistance Plate Cap 350: Covering Seal

Claims (9)

A replaceable pattern resistor plate formed by forming a trimming pattern on the resistive plate material corresponding to the target resistance value so that the output current of the sensor body of the oxygen sensor is made constant;
A cable extending from the sensor body; And
And a mounting module which is electrically connected to the cable and which closes a replacement plate door of the pattern resistive plate by a detachable resistive plate cap so as to replaceably mount or detach the pattern resistive plate
And a laser trimming resistive plate.
The method according to claim 1,
The cable,
And the cable end of the cable is electrically connected to the fork pin located inside the mounting module with respect to the opposite end of the sensor body
And a laser trimming resistive plate.
3. The method of claim 2,
The mounting module includes:
And a pair of forks, which are bent in one piece from the one end and extend toward the pattern resistive plate and then contacted with the upper or lower surface of the pattern resistive plate, A fork pin having another end of the mold;
A housing cap for a connector into which an end of the one end of the fork pin is inserted;
A housing accommodating the fork pin and the housing cap for the connector, the housing having a plate entry / exit opening toward the pattern resistance plate, the other end of the forked form being exposed through the plate entry / exit; And
And a resistance plate cap which closes the plate entry / exit port after the pattern resistance plate is fitted into the gap of the forked other end of the fork pin through the plate entry /
And a laser trimming resistive plate.
The method of claim 3,
The mounting module includes:
And a cover seal which is located inside the resistance plate cap and contacts the end of the pattern resistive plate opposite to the fork pin
And a laser trimming resistive plate.
5. The method of claim 4,
The resistive plate cap includes:
A cap body having a hollow cross-section enclosing the cover seal; And
And a ring-shaped elastic body formed integrally on both sides of the outer circumferential surface of the cap body and each extending toward the fastening protrusions formed on both sides of the housing
And a laser trimming resistive plate.
6. The method of claim 5,
The fastening protrusion of the housing
And a chamfered portion having an inclined surface with respect to a portion in contact with the elastic body portion is formed so as to bend the elastic body portion of the resistance plate cap when the housing and the resistance plate cap are coupled
And a laser trimming resistive plate.
The method of claim 3,
The fork pin
A contact protrusion protruding from one another at the other end of the fork type is formed so that point contact can be made with respect to the bottom surface or the top surface of the pattern resistive plate
And a laser trimming resistive plate.
8. The method of claim 7,
The fork pin
And a V-shaped stopper portion is formed at the branch starting point of the other end of the fork type so as to prevent excessive insertion of the pattern resistive plate
And a laser trimming resistive plate.
The method according to claim 1,
Wherein the pattern resistive plate comprises:
A first trimming pattern of a linear shape which is opened at one side of the pattern resistive plate and is not opened at the other side,
A second trimming pattern of two parallel straight lines parallel to the first trimming pattern and having a relatively short or long length,
An L-shaped third trimming pattern folded at right angles at an end of the first trimming pattern,
A trimming pattern corresponding to any one of the third trimming pattern and the fourth trimming pattern having a shape in which the first trimming pattern is arranged in parallel
And a laser trimming resistive plate.

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