KR102542520B1 - Thermal test system for temperature sensor of exhaust pipe - Google Patents

Abstract

The present invention is directed to a thermal test system for an exhaust system temperature sensor that can test the performance and durability of an engine exhaust system by artificially imitating a thermal environment such as thermal shock or thermal vibration in a temperature sensor for an exhaust system that measures the exhaust temperature of a vehicle. It relates to, a heating jig for a sensor having a temperature sensor accommodating portion capable of accommodating a temperature sensor on one side and a laser light receiving portion generating heat by receiving laser light on the other side; a laser light irradiation device for irradiating the laser light to the heating jig for the sensor; a temperature measuring device for measuring the temperature of the heating jig for the sensor and applying a temperature signal; and a control unit receiving the temperature signal and applying a laser light control signal to the laser light irradiation device.

Description

Thermal test system for temperature sensor of exhaust pipe}

The present invention relates to a thermal test system for a temperature sensor for an exhaust system, and more particularly, to a temperature sensor for an exhaust system that measures exhaust temperature of a vehicle by artificially mimicking a thermal environment such as thermal shock or thermal vibration, thereby improving engine exhaust system performance and performance. It relates to a thermal test system for a temperature sensor for an exhaust system that enables durability testing.

As environmental regulations for automobiles become stricter, it is important to properly maintain the exhaust temperature in order to reduce NOx, one of the harmful exhaust substances. Above the proper temperature, NOx emission is reduced due to the operation of the aftertreatment device, so it is necessary to accurately measure the exhaust temperature. In particular, in the case of the temperature sensor for exhaust gas these days, the operating temperature range is required to be over 1000 degrees Celsius, so the test equipment must also be manufactured in the temperature range that can evaluate it.

Conventional thermal test devices use exhaust gas or flame from the outside to conduct a thermal shock and thermal vibration complex test of a temperature sensor that operates at 1,000 degrees Celsius or more. It was a blow test. However, in this method, the combustion type test device increases the size of the equipment, and many problems such as smoke/noise/safety generated when burning fuel such as LPG gas or diesel occur. The device becomes complicated, such as the need to apply a path change device that changes the path, the risk of explosion due to careless handling of flame and fuel is high, the accuracy of the thermal environment or the test temperature range is low, and the time to create the thermal environment is increased. There were many problems such as low reliability of test results and very poor test environment.

The spirit of the present invention can reduce the size of the equipment, is eco-friendly by using laser light that does not generate fuel or flame, and has a high accuracy of the thermal environment or a high test temperature range, so that the precision of implementing the thermal vibration environment, test performance, and Test reliability can be greatly improved, the device is relatively simple to install and use, and the time to create a thermal environment can be reduced to save energy. It is to provide a thermal test system. However, these tasks are exemplary, and the scope of the present invention is not limited thereby.

In order to solve the above problems, a thermal test system for a temperature sensor for an exhaust system according to the present invention has a temperature sensor accommodating portion capable of accommodating a temperature sensor on one side, and a laser light receiving portion generating heat by receiving laser light on the other side. Heating jig for the sensor to be formed; a laser light irradiation device for irradiating the laser light to the heating jig for the sensor; a temperature measuring device for measuring the temperature of the heating jig for the sensor and applying a temperature signal; and a control unit receiving the temperature signal and applying a laser light control signal to the laser light irradiation device.

Further, according to the present invention, a low-temperature cooler for cooling the sensor heating jig is included, and the control unit applies the laser light irradiation device so that the temperature of the sensor heating jig can repeat a thermal cycle. A heating control signal and a cooling control signal applied to the low-temperature cooler may be alternately output.

Further, according to the present invention, the low-temperature cooler may include a blower for supplying outside air to the heat generating jig for the sensor.

In addition, according to the present invention, the heating jig for the sensor has a hollow part so as to imitate the environment of the exhaust pipe of a vehicle, and the pipe-shaped wall part in which the temperature sensor receiving part is formed in a radial shape; and a dome portion formed in a dome shape above the wall portion and having the laser light receiving portion formed thereon.

In addition, according to the present invention, the temperature measuring device, a first infrared sensor for measuring the temperature of the central portion of the laser light receiving portion of the dome portion in a non-contact manner; and a second infrared sensor for measuring the temperature of an edge portion of the laser light receiving portion of the dome portion in a non-contact manner.

In addition, according to the present invention, the laser light irradiation device, a laser oscillator for generating a laser light; a laser transmission fiber that transmits the laser light generated by the laser oscillator; and a laser irradiation head for irradiating the laser light transmitted from the laser transmission fiber to the heat generating jig for the sensor.

In addition, according to the present invention, the laser light irradiation device may further include a head lifting and lowering device that lifts and lowers the laser irradiation head so that the heat generating jig for the sensor is located under the focal point of the laser light.

In addition, according to the present invention, the head elevating device includes an elevating table on which the laser irradiation head is installed; and an elevating cylinder for elevating and lowering the elevating table with pneumatic or hydraulic pressure.

According to some embodiments of the present invention made as described above, the thermal shock and thermal vibration environment of the exhaust temperature sensor, which rises and falls from 200 degrees Celsius to 1000 degrees Celsius, can be imitated very similarly to the actual environment by using laser light as a heat source. It is possible to reduce the size of the equipment, it is eco-friendly because no fuel or flame is generated, and the accuracy of the thermal environment or the test temperature range is high, so the precision of the implementation of the thermal vibration environment, test performance, and test reliability can be greatly improved, The device is relatively simple, so it is convenient to install and use, it is possible to save energy by reducing the time to create a thermal environment, and it has the effect of providing a high-quality test environment. Of course, the scope of the present invention is not limited by these effects.

1 is a perspective view conceptually illustrating a thermal test system of a temperature sensor for an exhaust system according to some embodiments of the present invention.
2 is an enlarged perspective view of the thermal test system of the temperature sensor for the exhaust system of FIG. 1;
3 is a front view of the thermal test system of the temperature sensor for the exhaust system of FIG. 1;
FIG. 4 is a perspective view illustrating a heating jig for a sensor of a thermal test system for a temperature sensor for an exhaust system of FIG. 1 .
FIG. 5 is a partially cut perspective view showing a heating jig for a sensor of a thermal test system for a temperature sensor for an exhaust system of FIG. 4 .

Hereinafter, several preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The embodiments of the present invention are provided to more completely explain the present invention to those skilled in the art, and the following examples may be modified in many different forms, and the scope of the present invention is as follows It is not limited to the examples. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the spirit of the invention to those skilled in the art. In addition, the thickness or size of each layer in the drawings is exaggerated for convenience and clarity of explanation.

In this specification, terms such as first and second are used to describe various members, components, regions, layers and/or portions, but these members, components, regions, layers and/or portions are limited by these terms. It is self-evident that no These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Thus, a first member, component, region, layer or section described in detail below may refer to a second member, component, region, layer or section without departing from the teachings of the present invention.

Terms used in this specification are used to describe specific embodiments and are not intended to limit the present invention. As used herein, the singular form may include the plural form unless the context clearly indicates otherwise. Also, when used herein, "comprise" and/or "comprising" specifies the presence of the recited shapes, numbers, steps, operations, elements, elements, and/or groups thereof. and does not exclude the presence or addition of one or more other shapes, numbers, operations, elements, elements and/or groups.

Hereinafter, embodiments of the present invention will be described with reference to drawings schematically showing ideal embodiments of the present invention. In the drawings, variations of the depicted shape may be expected, depending on, for example, manufacturing techniques and/or tolerances. Therefore, embodiments of the inventive concept should not be construed as being limited to the specific shape of the region shown in this specification, but should include, for example, a change in shape caused by manufacturing.

1 is a perspective view conceptually illustrating a thermal test system 100 of a temperature sensor for an exhaust system according to some embodiments of the present invention, and FIG. 2 is an enlarged perspective view of the thermal test system 100 for a temperature sensor for an exhaust system of FIG. 1 Figure 3 is a front view of the thermal test system 100 of the temperature sensor for the exhaust system of FIG. FIG. 5 is a partially cut-away perspective view showing the heating jig 10 for the sensor of the thermal test system 100 of the temperature sensor for the exhaust system of FIG. 4 .

First, as shown in FIGS. 1 to 5 , the thermal test system 100 of the temperature sensor for an exhaust system according to some embodiments of the present invention includes a sensor heating jig 10 and a laser light irradiation device ( 20), a temperature measuring device 30, a controller 40, and a low-temperature cooler 50.

For example, as shown in FIGS. 1 to 5, the sensor heating jig 10 has a temperature sensor accommodating portion 10a capable of accommodating the temperature sensor 1 on one side, and a laser light beam on the other side. It may be a structure made of a metal-based, ceramic-based, or heat-resistant material in which a laser light receiving unit 10b that generates heat by receiving light (L) is formed.

More specifically, for example, as shown in FIGS. 4 and 4 , the heat-generating jig 10 for the sensor has a hollow part A so as to imitate the environment of an automobile exhaust pipe, and accommodates the temperature sensor. A pipe-shaped wall portion 10-1 in which the portion 10a is formed in a radial shape and a dome portion 10-1 formed in a dome shape above the wall portion 10-1 and having the laser light receiving portion formed on the upper surface thereof. 2) may be included. The heating jig 10 for the sensor may be installed on the table T so that it can be installed at a constant height from the floor so that heat from the ground or floor is not transferred.

The heating jig 10 for the sensor is formed so that the temperature of the central portion is high and the temperature of the rim portion is low while imitating the exhaust of a car, and the laser light ( L), since the laser light (L) is vertically irradiated at the center of the dome part 10-2 of the sensor heating jig 10, the optical density is relatively high and can be heated to a high temperature. Since the laser light (L) is irradiated obliquely at the edge of the dome part 10-2 of the sensor heating jig 10, the light density is relatively low and can be heated at a low temperature, just like the exhaust pipe of a car. A similar thermal environment can be realized.

Also, here, the temperature sensor accommodating part 10a is formed in a radial shape in the pipe-shaped wall part 10-1, and may be formed similarly to a shape installed in an actual vehicle exhaust pipe.

As shown in FIGS. 4 and 5, in the drawing, the height of the wall portion 10-1 is low, and the wall portion 10-1 is integrally formed with the dome portion 10-2 to form the wall portion. Although the boundary between 10-1 and the dome part 10-2 may be difficult to distinguish with the naked eye, here, the wall part 10-1 is installed with a plurality of the temperature sensors 1 constituting the first floor. can be understood in parts.

However, the wall portion 10-1 is not necessarily limited to the drawing, and when the temperature sensor 1 is made of a plurality of layers, it is possible to form a high height. In this case, a larger number of the temperature sensors 1 can be tested simultaneously.

In addition, the temperature sensor 1 can be applied to various temperature measuring members such as various rod-shaped temperature sensors or bimetals, and this is not limited to the drawing, and temperature sensors of various types can be applied.

In addition, for example, the laser light irradiation device 20 is a device for irradiating the laser light L to the sensor heating jig 10, and is a light amplification by stimulated emission device (Light Amplification by Stimulated Emission of Radiation) can be a kind of

Here, the laser light irradiation device 20 is in the form of attaching mirrors to both sides of a long and thin resonator, filling a laser medium such as a solid, liquid, gas, semiconductor, free electron, etc. It can be any device using the principle of amplification by generating stimulated emission in a resonator composed of a mirror and a partial mirror when light is generated from the medium when it is put into a laser medium, or a laser light generating device using a semiconductor process. there is.

More specifically, for example, as shown in FIGS. 1 to 5, the laser light irradiation device 20 includes a laser oscillator 21 that generates a laser light L, and the laser oscillator 21 A laser transmission fiber 22 that transmits the generated laser light L, and a laser irradiation head that irradiates the laser light L received from the laser transmission fiber 22 to the sensor heating jig 10 (23) and a head lifting and lowering device (24) that lifts and lowers the laser irradiation head (23) so that the heating jig (10) for the sensor is located under the focal point (P) of the laser light (L). there is.

Here, for example, the head elevating device 24 includes an elevating table 241 on which the laser irradiation head 23 is installed and an elevating cylinder for elevating and lowering the elevating table 241 with pneumatic or hydraulic pressure 242) may be included. However, it is not necessarily limited thereto, and various lifting and lowering devices such as linear motors and various actuators may all be applied.

Therefore, while the lifting platform 241 is raised and lowered by applying a control signal to the lifting cylinder 242 of the head lifting device 24, the heating jig 10 for the sensor emits the laser light (L). The laser irradiation head 23 may be moved up and down so as to be located under the focal point P of the .

Therefore, the laser light L can be uniformly irradiated over a wide range, that is, the surface of the laser light receiving part 10b of the heating jig 10 for the sensor.

Subsequently, the laser light L generated from the laser oscillator 21 passes through the laser transmission fiber 22 and is transferred to the laser irradiation head 23, and the laser irradiation head 23 transmits the laser The laser light (L) transmitted from the fiber 22 may be irradiated to the heating jig 10 for the sensor.

On the other hand, a blocking plate R may be installed in front of the laser light irradiation device 20 to prevent external emission of the laser light L and the resulting thermal energy and to protect equipment.

On the other hand, the laser light irradiation device 20 is not necessarily limited to the drawings, and various laser irradiation devices using a laser element or the like may be applied.

In addition, for example, as shown in FIGS. 1 to 3, the temperature measuring device 30 is a device for measuring the temperature of the heating jig 10 for the sensor and applying a temperature signal, and is a non-contact sensor of various types. may be applied.

More specifically, for example, the temperature measuring device 30 includes a first infrared sensor 31 for measuring the temperature of the center of the laser light receiving part 10b of the dome part 10-2 in a non-contact manner and the dome part (10-2) may include a second infrared sensor 32 for precisely measuring the temperature of the edge portion of the laser light receiving portion 10b in a non-contact manner.

That is, the temperature measuring device 30 of the present invention is for controlling an accurate actual test temperature using the laser light irradiation device 20 and the low-temperature cooler 50, through which thermal shock caused by rapid heating and cooling It is to implement a thermal vibration environment that meets the environment and heating and cooling.

Also, for example, as shown in FIGS. 1 to 5 , the low-temperature cooler 50 may be a cooling device that cools the heat generating jig 10 for the sensor. More specifically, for example, the low-temperature cooler 50 may include a blower 51 that supplies outside air to the heat generating jig 10 for the sensor. However, it is not necessarily limited thereto, and various cooling devices such as various chillers, cooling cycle devices, and thermoelectric elements may all be applied.

In addition, for example, the controller 40 receives the temperature signal and applies a laser light control signal to the laser light irradiation device 20 and the low-temperature cooler 50, a microprocessor, or a central processing unit. I, an arithmetic device, or a semiconductor device capable of executing various programs.

Therefore, the control unit 40 controls the heating control signal applied to the laser light irradiation device 20 and the low-temperature cooler 50 so that the temperature of the sensor heating jig 10 can repeat a thermal cycle. The applied cooling control signal can be alternately output.

Therefore, by using the laser light irradiation device 20, the low-temperature cooler 50, and the control unit 40, various thermal shocks such as rapid heating or rapid cooling can be tested in a similar manner to an actual environment, and heating and cooling can be performed. Thermal vibration tests that repeat alternating thermal cycles can be tested similarly to real environments.

That is, the present invention can imitate the thermal shock and thermal vibration environment of the temperature sensor 1 that rises and falls from 200 degrees Celsius to 1000 degrees Celsius using the above-described laser light L as a heat source very similar to the actual environment, Compared to conventional fuel burning equipment, the size of the equipment can be reduced, and as a result, the thermal test can be conveniently performed under a comfortable environment indoors as well as outdoors.

In addition, fuel or flame is not generated as in the past, and as a result, various soot, dust, noise, vibration, and the like are not generated, so it can be very environmentally friendly.

In addition, since the output of the laser light L is easy to control and the accuracy of the thermal environment or the test temperature range is high, the accuracy of implementing the thermal vibration environment, test performance, and test reliability can be greatly improved.

In addition, by using the dome-shaped heating jig 10 for the sensor, the exhaust port of a car can be similarly imitated, the device is relatively simple to install and use, and energy can be saved by reducing the time to create a thermal environment. and can provide a quality test environment.

Although the present invention has been described with reference to the embodiments shown in the drawings, this is merely exemplary, and those skilled in the art will understand that various modifications and equivalent other embodiments are possible therefrom. Therefore, the true technical protection scope of the present invention should be determined by the technical spirit of the appended claims.

1: Temperature sensor
10: Heating jig for sensor
10-1: wall part
10-2: dome part
20: laser light irradiation device
21: laser oscillator
22: laser transmission fiber
23: laser irradiation head
24: head lifting device
30: temperature measuring device
31: first infrared sensor
32: second infrared sensor
40: control unit
50: low temperature cooler
51: blower
100: Thermal test system of temperature sensor for exhaust system

Claims (8)

Heating jig for a sensor having a temperature sensor accommodating portion capable of accommodating a temperature sensor on one side and a laser light receiving portion generating heat by receiving laser light on the other side;
a laser light irradiation device for irradiating the laser light to the heating jig for the sensor;
a temperature measuring device for measuring the temperature of the heating jig for the sensor and applying a temperature signal; and
a control unit receiving the temperature signal and applying a laser light control signal to the laser light irradiation device;
including,
The heating jig for the sensor,
A pipe-shaped wall portion having a hollow portion to imitate the environment of an automobile exhaust pipe and having a radial shape of the temperature sensor receiving portion; and
a dome portion formed in a dome shape above the wall portion and having the laser light receiving portion formed on an upper surface thereof;
A thermal test system for a temperature sensor for an exhaust system comprising a. According to claim 1,
a low-temperature cooler for cooling the heating jig for the sensor;
Including more,
The control unit alternately outputs a heating control signal applied to the laser light irradiation device and a cooling control signal applied to the low-temperature cooler so that the temperature of the sensor heating jig can repeat a thermal cycle. The sensor's thermal test system. According to claim 2,
The thermal test system of a temperature sensor for an exhaust system, wherein the low-temperature cooler includes a blower for supplying outside air to the heat generating jig for the sensor. delete According to claim 1,
The temperature measuring device,
a first infrared sensor for measuring the temperature of the central part of the laser light receiving part of the dome part in a non-contact manner; and
a second infrared sensor for measuring the temperature of an edge portion of the laser light receiving portion of the dome portion in a non-contact manner;
Further comprising a thermal test system for a temperature sensor for an exhaust system. According to claim 1,
The laser light irradiation device,
a laser oscillator that generates laser light;
a laser transmission fiber that transmits the laser light generated by the laser oscillator; and
a laser irradiation head that irradiates the laser light transmitted from the laser transmission fiber to the sensor heating jig;
A thermal test system for a temperature sensor for an exhaust system comprising a. According to claim 6,
The laser light irradiation device,
a head lifting and lowering device that lifts and lowers the laser irradiation head so that the heating jig for the sensor is located under the focal point of the laser light;
Further comprising a thermal test system for a temperature sensor for an exhaust system. According to claim 7,
The head lifting device,
an elevation platform on which the laser irradiation head is installed; and
an elevating cylinder for elevating and lowering the elevating table with pneumatic or hydraulic pressure;
A thermal test system for a temperature sensor for an exhaust system comprising a.

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