CN205027449U - Rapid temperature measurement system of automobile engine based on contact infrared temperature measurement technology - Google Patents

Abstract

The utility model discloses a rapid temperature measurement system of an automobile engine based on a contact infrared temperature measurement technology, which comprises a contact heat conduction module, an infrared detection module and a processing module; the infrared detection module comprises an infrared sensor and an optical filter for blocking visible light and near infrared radiation; the contact type heat conduction module is arranged on the surface of the automobile engine, the optical filter is arranged between the contact type heat conduction module and the infrared sensor, the distance between the optical filter and the contact type heat conduction module is larger than the distance between the optical filter and the infrared sensor, and the infrared sensor is connected with the processing module. The contact type heat conduction module comprises a chromium plating layer, a copper foil and a graphene film, wherein the chromium plating layer is arranged on the surface of the automobile engine, the copper foil is arranged on the chromium plating layer, and the graphene film is arranged on the copper foil. The utility model discloses shorten the temperature measurement time, but the temperature of different emissivity position departments on the various automobile engine of accurate measurement, greatly increased the universality.

Description

Rapid temperature measurement system of automobile engine based on contact infrared temperature measurement technology

technical field

The utility model relates to the technical field of temperature detection, in particular to a rapid temperature measurement system of an automobile engine based on contact infrared temperature measurement technology.

Background technique

In the traditional temperature measurement process of an automobile engine based on contact temperature measurement, as shown in Figure 1 is a schematic diagram of the traditional contact temperature measurement, the automobile engine first conducts heat exchange with the heat-conducting material until the heat is balanced, and the heat-conducting material and the temperature sensor are also thermally Exchange until the heat balance, and the heat exchange is affected by various factors, such as the thermal conductivity of the material, the gap between the contact surface, the surface roughness of the contact surface, etc., resulting in a long heat exchange time, while for the traditional contact temperature measurement, the entire The process has undergone two heat exchanges, so the temperature measurement time is very long, more than 120 seconds.

Infrared temperature measurement is achieved by using the radiation received by the infrared sensitive element in the sensor to measure the object, as shown in Figure 2 is a schematic diagram of non-contact infrared temperature measurement. The radiation absorbed by the sensor is related to the emissivity of the measured object, and it is impossible to accurately measure the temperature of an object with an unknown emissivity. In addition, it is very complicated to measure an object with a low emissivity, so the non-contact infrared temperature measuring instruments currently on the market are all It is applied based on the known emissivity of the measured object, which has limitations and cannot be universally applied.

Contents of the invention

The technical problem to be solved by the utility model is to overcome the deficiencies of the prior art and provide a rapid temperature measurement system for automobile engines based on contact infrared temperature measurement technology. The utility model shortens the temperature measurement time and can accurately measure the The temperature at different emissivity locations greatly increases the generalizability.

The utility model adopts the following technical solutions for solving the above-mentioned technical problems:

The rapid temperature measurement system of an automobile engine based on contact infrared temperature measurement technology proposed by the utility model includes a contact heat conduction module, an infrared detection module, and a processing module; wherein, the infrared detection module includes an infrared sensor for blocking visible light and an optical filter for near-infrared light radiation; the contact heat conduction module is arranged on the surface of the automobile engine, the optical filter is arranged between the contact heat conduction module and the infrared sensor, and the distance between the optical filter and the contact heat conduction module is greater than that of the optical filter The distance between the sensor and the infrared sensor, and the infrared sensor is connected to the processing module.

As a further optimization scheme of the rapid temperature measurement system of the automobile engine based on the contact infrared temperature measurement technology described in the utility model, the contact heat conduction module includes a chrome-plated layer, a copper foil and a graphene film, wherein the chrome-plated layer is arranged on the automobile engine. On the surface of the engine, the copper foil is set on the chrome plating layer, and the graphene film is set on the copper foil.

As the further optimization scheme of the rapid temperature measurement system of the automobile engine based on the contact infrared temperature measurement technology described in the utility model, the thermal conductivity of the copper foil is greater than 350W/m·K, the thickness of the chrome plating layer is less than 0.2mm, and the copper foil The thickness of the graphene film is less than 0.5 mm, and the thickness of the graphene film is less than 50 μm.

As a further optimization scheme of the rapid temperature measurement system of an automobile engine based on contact infrared temperature measurement technology described in the present invention, the processing module includes a signal processor, a noise reduction unit, an analog-to-digital conversion unit and a single-chip microcomputer connected in sequence.

As a further optimization scheme of the rapid temperature measurement system of the automobile engine based on the contact infrared temperature measurement technology described in the utility model, it also includes a display module and a key input module respectively connected with the single-chip microcomputer.

Compared with the prior art by adopting the above technical scheme, the utility model has the following technical effects:

(1) Compared with the temperature measurement system of the automobile engine based on the traditional contact temperature measurement technology, the utility model reduces the heat exchange process between the heat conduction material and the contact temperature sensor, and greatly shortens the temperature measurement time;

(2) The utility model overcomes the limitation of the surface emissivity of the engine surface emissivity of the temperature measurement system of the automobile engine based on the traditional non-contact infrared temperature measurement technology, and greatly improves the universality;

(3) The temperature measurement range of the utility model is at least between -40 degrees Celsius and 100 degrees Celsius, which is related to the performance of the infrared sensor. The measurement accuracy can reach 0.1 degrees Celsius, and the measurement error in the full measurement range is within ±0.5 degrees Celsius. When the temperature difference from the measured object is 10 degrees Celsius, the measurement can reach the allowable error range in about 10s.

Description of drawings

Figure 1 is a schematic diagram of traditional contact temperature measurement.

Figure 2 is a schematic diagram of non-contact infrared temperature measurement.

Fig. 3 is a schematic diagram of an embodiment of the utility model.

Fig. 4 is a schematic structural diagram of a contact heat conduction module.

The reference signs in the figure are interpreted as: 1-chrome-plated layer, 2-copper foil, 3-graphene film.

detailed description

Below in conjunction with accompanying drawing, the technical scheme of the utility model is described in further detail:

The contact infrared temperature measurement technology used in this system is a combination of contact temperature measurement technology and infrared temperature measurement technology, and uses high thermal conductivity materials to contact the surface of the car engine under test for heat exchange and temperature balance. The temperature of the material is consistent with the surface temperature of the automobile engine. The infrared electromagnetic waves radiated by the heat-conducting material are filtered by the filter and then received by the infrared sensor. The infrared sensor extracts the digital output or analog output corresponding to the temperature information of the measured automobile engine. The data is analyzed and processed by the single-chip microcomputer, and the measured engine temperature is displayed to the user through the display module. This contact infrared temperature measurement technology, compared with the traditional contact temperature measurement, retains the link between the heat exchange between the tested automobile engine and the heat-conducting material to temperature balance, and reduces the heat exchange link between the heat-conducting material and the temperature sensor. Therefore, the temperature measurement time is greatly saved; compared with the non-contact infrared temperature measurement currently on the market, since the temperature measurement accuracy is related to the surface emissivity of the car engine under test, it is only necessary to accurately measure the surface emissivity of the heat-conducting material, then the detection and the tested The temperature of the tested car engine can be obtained by measuring the temperature of the heat-conducting material with the same engine temperature, which solves the limitation that different types of car engines have different emissivity and cannot use infrared sensors to accurately measure the temperature of different parts of the engine. , greatly increasing the universality. Combining the above two aspects, we designed a rapid temperature measurement system for automobile engines based on contact infrared temperature measurement technology. The temperature measurement range is the same as that of infrared sensors in the stable state of heat-conducting materials, and the temperature measurement accuracy and error are the same as those of infrared sensors. However, it is possible to measure the temperature at different positions of the engine of various materials without correcting the emissivity; compared with the contact type, the temperature measurement time is greatly shortened.

Figure 3 is a schematic diagram of an embodiment of the present utility model, the rapid temperature measurement system of an automobile engine based on contact infrared temperature measurement technology, including a contact heat conduction module, an infrared detection module, and a processing module; wherein the infrared detection module It includes an infrared sensor and an optical filter for blocking visible light and near-infrared radiation; the contact heat conduction module is arranged on the surface of the automobile engine, the optical filter is arranged between the contact heat conduction module and the infrared sensor, and the optical filter and the contact The distance between the type heat conduction module is greater than the distance between the optical filter and the infrared sensor, and the infrared sensor is connected with the processing module. The processing module is used to calculate the temperature of the measured object from the radiation received by the infrared sensor. The processing module includes a signal processor, an analog-to-digital conversion unit and a single-chip microcomputer connected in sequence, and a display module and a key input module respectively connected to the single-chip microcomputer. A noise reduction unit may also be provided between the signal processor and the analog-to-digital conversion unit, and the signal processor, the noise reduction unit, and the analog-to-digital conversion unit are sequentially connected. The optical filter is placed between the contact heat conduction module and the infrared sensor close to the end of the infrared sensor for immunity to the environment and sunlight. The infrared sensor has a built-in infrared induction thermopile detector chip and a special chip for signal processing.

Fig. 4 is a structural schematic diagram of a contact heat conduction module, the contact heat conduction module includes a chrome-plated layer 1, a copper foil 2 and a graphene film 3, wherein the chrome-plated layer is arranged on the surface of the automobile engine, and the copper foil is arranged on the chrome-plated layer, A graphene film is provided on a copper foil. The thermal conductivity of the copper foil is greater than 350W/m·K, the thickness of the chromium plating layer is less than 0.2mm, the thickness of the copper foil is less than 0.5mm, and the thickness of the graphene film is less than 50μm.

The surface of graphene has uniform and high emissivity. For infrared sensors, high emissivity improves measurement accuracy. Uniform emissivity means that different types of engines can be measured without changing any parameters, increasing universality . Copper foil has high thermal conductivity, and the surface of copper foil in contact with the automobile engine is plated with a thin layer of chromium to improve wear resistance and increase service life; the other side is pasted with graphene film or coating, which increases thermal conductivity on the one hand The temperature is quickly and evenly distributed in the graphene layer. On the other hand, the graphene surface has a uniform and high emissivity. For infrared sensors, high emissivity improves measurement accuracy. Uniform emissivity means that no need to change any parameters It can measure the temperature of different types of engines to increase the universality.

The utility model retains the structure in which the heat-conducting material contacts the surface of the measured automobile engine in the traditional contact temperature measurement and exchanges heat until the temperature is balanced, reduces the heat exchange link between the temperature sensor and the heat-conducting material, and greatly saves the temperature measurement time. The infrared sensor is used to detect the temperature of the heat-conducting material, and at the same time, it solves the problems that the contact temperature measurement speed is slow and the infrared sensor is bound by the emissivity of the car engine under test. Therefore, it is not necessary to know the emissivity of the measured automobile engine, and the temperature of the surface of various positions of different types of automobile engines can be measured, which greatly increases the universality.

When using the rapid temperature measurement system of an automobile engine based on contact infrared temperature measurement technology, the contact heat conduction module is first attached to the surface of the automobile engine. When the heat conduction material and the automobile engine reach thermal equilibrium, the temperature of the inner graphene material is basically the Consistent, after filtering the light waves in the environment and sunlight through the optical filter, the infrared detection module detects the temperature of the graphene film or coating, and then transmits the temperature information to the single-chip microcomputer through information processing, and the single-chip microcomputer controls the display module to display the temperature of the measured object. At the same time, according to the different functional requirements of the user, the external input device transmits functions such as power on and off, backlight switch, etc. to the single-chip microcomputer, and the single-chip microcomputer handles such functional requirements.

The working process of the system provided by the utility model is as follows:

A. Use the contact heat conduction module to contact the high-performance heat conduction material with the surface of the automobile engine for heat exchange until heat balance;

B. The infrared detection module uses an infrared sensor to receive the radiation of the thermally conductive material after filtering out visible light and near-infrared light radiation through an optical filter;

C. Utilize the processing module to pass the radiation received by the infrared sensor through the signal processor, the noise reduction unit, the analog-to-digital conversion unit and the single-chip microcomputer in sequence, and then calculate the temperature of the measured automobile engine.

D. The display module will use buttons connected with temperature measurement-related functions to control the display screen, and then display the measurement results to the user.

Therefore, compared with the temperature measurement system of the automobile engine based on the traditional contact temperature measurement technology, the whole process reduces the heat exchange process between the heat conduction material and the contact temperature sensor, and greatly shortens the temperature measurement time; The temperature measurement system of the automobile engine of the temperature measurement technology has limitations on the emissivity of the engine surface, which greatly improves the universality.

Apparently, the above-mentioned embodiments of the present utility model are only examples for clearly illustrating the present utility model, rather than limiting the implementation manner of the present utility model. For those of ordinary skill in the art, other changes or changes in different forms can be made on the basis of the above description. It is not necessary and impossible to exhaustively list all the implementation manners here. And these obvious changes or changes derived from the essential spirit of the present utility model still belong to the protection scope of the present utility model.

Claims (5)

1. based on the quick temperature measurement system of the motor car engine of contact infrared temperature-test technology, it is characterized in that, comprise contact heat conducting module, infrared detection module, processing module; Wherein, described infrared detection module comprises infrared sensor, optical filter for block visible light and near infrared radiation; Contact heat conducting module is arranged on the surface of motor car engine, optical filter is arranged between contact heat conducting module and infrared sensor, and the distance of optical filter and contact heat conducting module is greater than the distance of optical filter and infrared sensor, infrared sensor is connected with processing module.

2. the quick temperature measurement system of the motor car engine based on contact infrared temperature-test technology according to claim 1, it is characterized in that, described contact heat conducting module comprises chromium coating, Copper Foil and graphene film, wherein, chromium coating is arranged on the surface of motor car engine, Copper Foil is arranged on chromium coating, and graphene film is arranged on Copper Foil.

3. the quick temperature measurement system of the motor car engine based on contact infrared temperature-test technology according to claim 2, it is characterized in that, the coefficient of heat conductivity of described Copper Foil is greater than 350W/mK, the thickness of chromium coating is less than 0.2mm, the thickness of Copper Foil is less than 0.5mm, and the thickness of graphene film is less than 50 μm.

4. the quick temperature measurement system of the motor car engine based on contact infrared temperature-test technology according to claim 1, is characterized in that, described processing module comprises the signal processor, noise reduction unit, AD conversion unit and the single-chip microcomputer that connect successively.

5. the quick temperature measurement system of the motor car engine based on contact infrared temperature-test technology according to claim 4, is characterized in that, also comprises the display module and keyboard input module that are connected respectively with single-chip microcomputer.