CN114061790A

CN114061790A - PGU temperature detection method of head-up display

Info

Publication number: CN114061790A
Application number: CN202111132624.5A
Authority: CN
Inventors: 刘鹏; 安新刚; 雷阳晔
Original assignee: Foryou Multimedia Electronics Co Ltd
Current assignee: Foryou Multimedia Electronics Co Ltd
Priority date: 2021-09-27
Filing date: 2021-09-27
Publication date: 2022-02-18

Abstract

The invention relates to a PGU temperature detection method of a head-up display, which comprises a main control system and is characterized in that: the detection method is a method for detecting the temperature of the PGU by installing a plurality of temperature sensors which are respectively connected with the master control system on the PGU screen of the HUD so as to obtain the temperatures of a plurality of positions on the PGU screen in real time; the detection method can judge whether the HUD generates sunlight and reversely irradiates the PGU screen according to the temperatures of the multiple positions on the PGU screen, which are acquired by the multiple temperature sensors. The method for detecting the PGU temperature of the head-up display has the advantages that the PGU temperature can be directly detected in real time, whether the HUD is irradiated by sunlight in a reverse direction or not is judged according to the PGU temperature condition, and the like.

Description

PGU temperature detection method of head-up display

Technical Field

The invention relates to the technical field of head-up displays, in particular to a PGU temperature detection method of a head-up display.

Background

The head-up display is called HUD for short, and has the function of projecting the driving information such as speed per hour, navigation and external intelligent equipment to the windshield in front of the driver, so that the driver can see the important driving information such as speed per hour, navigation and the like without lowering head or turning head as much as possible, the sight line does not need to be transferred back and forth, and the driving safety is enhanced.

The PGU, which is the projection unit of the HUD, is the most central component of the HUD, and functions to generate the HUD output image, and is composed of a light source, an optical diaphragm, a screen, and other optical components.

As can be seen from the HUD imaging schematic diagram of fig. 3, the HUD magnifies the image on the image source (PGU) through the geometric optical path, and projects the magnified image onto the windshield 1 and into the human eyes 2, so as to form the image 3 for the driver to observe. The HUD is usually mounted in front of the vehicle-mounted instrument through the HUD housing 5, and is directly exposed to sunlight, and due to the reversibility of the light path, the sunlight may be reflected by a curved mirror 40 (i.e., a secondary mirror) 7 and a primary mirror 6 in fig. 3 and then converged on the PGU screen 4, so as to generate heat. Besides the screen bears the heat reversely gathered by the sunlight, the heat generated by the backlight 8 can also act on the screen. In recent years, for better user experience, the view range and projection distance of HUDs are gradually increased, further exacerbating the problem of screen overheating. At present, no good solution exists for the problem of screen overheating, and only a shutdown mode can be adopted when the occurrence of sunlight reverse irradiation is detected, so that the user experience is very poor.

Disclosure of Invention

In order to achieve the above purpose, the following technical solutions are provided.

The invention provides a PGU temperature detection method of a head-up display, which can directly detect the temperature of the PGU in real time.

A PGU temperature detection method of a head-up display comprises a main control system, wherein the detection method is a method for instantly acquiring a plurality of position temperatures on a PGU screen of a HUD by installing a plurality of temperature sensors respectively connected with the main control system on the PGU screen, so as to realize the detection of the PGU temperature; the detection method can judge whether the HUD generates sunlight and reversely irradiates the PGU screen according to the temperatures of the multiple positions on the PGU screen, which are acquired by the multiple temperature sensors. During the use of the HUD, when sunlight is reversely irradiated to a certain position on the PGU screen 20, the temperature of the corresponding position is much higher than that of the position without the sunlight, which may cause the PGU to be burned out due to overheating. When the HUD is used and is irradiated by sunlight in reverse, the temperature sensed by the temperature sensor is relatively high; and when no sunlight is reversely irradiated, the temperature distribution on the PGU screen is relatively uniform. According to the invention, due to the arrangement of the plurality of temperature sensors on the PGU screen, when sunlight is irradiated on the PGU screen in a reverse direction, a large difference value can be generated among a plurality of temperatures detected by the plurality of temperature sensors; when the PGU screen is not irradiated by sunlight in the reverse direction, the difference between a plurality of temperatures detected by a plurality of temperature sensors is very small, the plurality of temperature sensors are arranged, the temperature detection accuracy is high, and whether the PGU screen is irradiated by the sunlight in the reverse direction or not can be judged. If only one temperature sensor is arranged on the PGU, the temperature sensor can only detect the temperature of the PGU when no sunlight reversely irradiates, and the sensor cannot judge whether the sunlight reversely irradiates the PGU. Therefore, when only one temperature sensor is arranged, when sunlight is irradiated reversely, the temperature distribution of the PGU screen changes along with the change of the position of the sunlight irradiating on the PGU screen, so that the difference between the temperature detected by the temperature sensor and the actual highest temperature of the PGU screen changes; therefore, only one temperature sensor is installed to sense the temperature on the PGU, and the scheme for comparing the sensed temperature with the preset temperature by the master control system has too large error, and cannot be used as a method for detecting the reverse irradiation of sunlight.

Further, temperature sensor and PGU screen direct contact are connected, and temperature sensor specifically adopts to paste to fix on the PGU screen to link to each other with master control system through signal line and plug-in components, its occupation space is little, does not have the influence to the structure of HUD itself, on guaranteeing not to influence user's use and experience the basis, accurately acquires the temperature of PGU screen fast.

Further, the temperature sensors are distributed in other areas than the image display area on the PGU screen. Because the temperature sensor is arranged outside the image display area, the image can not be shielded, and the use experience of a user can not be influenced.

Furthermore, a plurality of temperature sensors are distributed in an array mode, namely one temperature sensor is arranged at an interval of the same distance, the plurality of temperature sensors can respectively sense the temperature of each point on the PGU screen, and the PGU screen temperature measuring device is high in accuracy and small in error.

Furthermore, the plurality of temperature sensors respectively convert the sensed temperature change into electric signals to be fed back to the main control system, and the main control system obtains the temperature difference value between the maximum temperature and the minimum temperature according to the maximum temperature and the minimum temperature in the fed-back electric signals.

Further, a preset temperature of the PGU is set in the master control system, and the preset temperature is 10 ℃. The preset temperature setting is used as a temperature basis for judging whether sunlight irradiates the PGU screen in a backlight mode.

And further, comparing the temperature difference value acquired by the master control system with a preset temperature to judge whether the HUD generates sunlight and irradiates the PGU screen.

Further, if the difference of maximum temperature and minimum temperature is not more than presetting the temperature, at this moment, there is not sunlight reverse light irradiation on the PGU screen, and the PGU temperature satisfies HUD's normal work demand, but normal use.

Further, if the difference of maximum temperature and minimum temperature surpassed preset temperature, at this moment, there is sunlight reverse light irradiation on the PGU screen, and the PGU temperature is overheated, can't satisfy HUD's normal work demand, and the major control system sends out the warning, takes the overheat protection to apply by mistake, avoids the overheated quilt of PGU screen to burn out.

Compared with the prior art, the PGU temperature detection method of the head-up display has the following beneficial effects:

firstly, the error is small, the detection accuracy is high, the temperature of each point on the PGU screen can be respectively sensed by the arrangement of a plurality of temperature sensors on the PGU screen, the error is small, and the accuracy is high;

secondly, the detection efficiency is high, the temperature sensors are in direct contact with the PGU screen, the sensing speed is high, and the efficiency is high;

the third, can be direct, real-time detection PGU temperature, install a plurality of temperature sensor that are array distribution on the PGU screen, a plurality of temperature sensor are connected with master control system respectively, through a plurality of temperature sensor directness and PGU contact induction detection PGU's temperature, and through the real-time output detection temperature of master control system, and judge whether there is the backlight to shine on the PGU according to detecting temperature, and judge whether the PGU screen is in overheated state.

Drawings

FIG. 1 is a perspective view of a head-up display in a PGU temperature detection method of the head-up display according to the present invention;

FIG. 2 is a schematic diagram of the distribution of the PGU screen and the temperature sensors thereon of FIG. 1;

fig. 3 is a HUD imaging schematic of the heads-up display.

Detailed Description

The PGU temperature overheat protection method of the present invention will be described in detail with reference to the following embodiments and accompanying drawings.

Referring to fig. 1 and 2, the present invention improves a head-up display, and further provides a PGU temperature detection method for a head-up display. The head-up display is called HUD for short and is usually arranged on a CCB beam support 50 in front of a vehicle-mounted instrument, and the head-up display is used for projecting driving information such as speed per hour, navigation and external intelligent equipment onto a windshield in front of a driver, so that the driver can see important driving information such as speed per hour and navigation without lowering head or turning head as far as possible, the sight line does not need to be transferred back and forth, and the driving safety is enhanced. The PGU, which is the projection unit of the HUD, is the most central component of the HUD, and functions to generate the HUD output image, and is composed of a light source, an optical diaphragm, a screen, and other optical components.

Referring to fig. 1 and 2, in a non-limiting embodiment of the present invention, a method for detecting a PGU temperature of a head-up display includes a main control system, where the method includes installing a plurality of temperature sensors 21 on a PGU screen 20 of a HUD, where the temperature sensors are respectively connected to the main control system, so as to obtain temperatures of a plurality of locations on the PGU screen 20 in real time, and thus implement a method for detecting the PGU temperature; the detection method can determine whether the HUD has the sunlight reversely irradiating the PGU screen 20 according to the temperatures of the plurality of positions on the PGU screen 20 acquired by the plurality of temperature sensors 21. In this embodiment, the PGU screen 20 is installed in the HUD base 10, a curved mirror 30 that can be turned over is further provided in the HUD base 10, and the PGU screen 20 is located below the curved mirror 30. In specific implementation, the head-up display is fixed on a beam bracket 40 in front of the CCB through the HUD base 10. During the use of the HUD, when sunlight is reversely irradiated to a certain position on the PGU screen 20, the temperature of the corresponding position is much higher than that of the position without the sunlight, which may cause the PGU to be burned out due to overheating. In the use process of the HUD, when sunlight is irradiated in the reverse direction, the temperature sensed by the temperature sensor 21 is relatively high; when no sunlight is irradiated reversely, the temperature distribution on the PGU screen 20 is relatively uniform. According to the invention, due to the arrangement of the plurality of temperature sensors 21 on the PGU screen 20, when sunlight is irradiated on the PGU screen 20 in a reverse direction, a large difference value occurs among a plurality of temperatures detected by the plurality of temperature sensors 21; when the PGU screen 20 is not irradiated with the sunlight in the reverse direction, the difference between the temperatures detected by the temperature sensors 21 is small, and the temperature sensors 21 are arranged, so that the temperature detection accuracy is high, and it can be determined whether the PGU screen 20 is irradiated with the sunlight in the reverse direction. If only one temperature sensor 21 is arranged on the PGU, the one temperature sensor 21 can only detect the temperature of the PGU when there is no reverse irradiation of sunlight, and cannot determine whether the reverse irradiation of sunlight occurs to the PGU through the sensor. Therefore, when only one temperature sensor 21 is provided, when the reverse irradiation of the sunlight occurs, the distribution of the temperature of the PGU screen 20 changes with the change of the position irradiated by the sunlight on the PGU screen 20, so that the difference between the temperature detected by the temperature sensor 21 and the actual maximum temperature of the PGU screen 20 changes; therefore, only one temperature sensor 21 is installed to sense the temperature on the PGU, and the scheme for comparing the sensed temperature with the preset temperature by the main control system has too large error, and cannot be used as a method for detecting the reverse irradiation of sunlight.

Referring to fig. 1 and 2, in a non-limiting embodiment of the present invention, the temperature sensor 21 is directly connected to the PGU screen 20 in a contact manner, and the temperature sensor 21 is specifically fixed by being attached to the PGU screen 20 and connected to the main control system through a signal line and a plug-in, so that the temperature sensor occupies a small space, has no influence on the structure of the HUD itself, and ensures that the temperature of the PGU screen 20 is accurately and quickly obtained on the basis of not influencing the user experience.

Referring to fig. 1 and 2, in a non-limiting embodiment of the present invention, the temperature sensors 21 are distributed in other areas on the PGU screen 20 than the image display area. Since the temperature sensor 21 is disposed outside the image display area, no image occlusion is caused, and it is ensured that the user experience is not affected.

Referring to fig. 1 and 2, in a non-limiting embodiment of the present invention, the plurality of temperature sensors 21 are distributed in an array, that is, one temperature sensor 21 is disposed at an equal interval, and the plurality of temperature sensors 21 can respectively sense the temperature of each point on the PGU screen 20, so that the accuracy is high and the error is small.

Referring to fig. 1 and 2, in a non-limiting embodiment of the present invention, a plurality of temperature sensors 21 respectively convert the sensed temperature changes into electrical signals and feed back the electrical signals to a main control system, and the main control system obtains a temperature difference between a maximum temperature and a minimum temperature according to a maximum temperature and a minimum temperature in the fed-back electrical signals.

Referring to fig. 1 and 2, in a non-limiting embodiment of the present invention, a preset PGU temperature is set in a master control system, where the preset PGU temperature is 10 ℃. The preset temperature setting is a temperature basis for determining whether sunlight is incident on the PGU screen 20 in the reverse direction.

Referring to fig. 1 and 2, in a non-limiting embodiment of the present invention, the temperature difference obtained by the main control system is compared with a preset temperature to determine whether the HUD has sunlight incident on the PGU screen 20. Specifically, if the difference between the maximum temperature and the minimum temperature is not greater than the preset temperature, at this time, no sunlight is irradiated on the PGU screen 20 in the reverse direction, and the PGU temperature meets the normal working requirement of the HUD and can be used normally; if the difference of maximum temperature and minimum temperature surpasses and predetermines the temperature, at this moment, there is sunlight reverse-ray irradiation on the PGU screen 20, and the PGU temperature is overheated, can't satisfy HUD's normal work demand, and the master control system sends the warning, takes the overheat protection to give a mistake and applys, avoids the overheated quilt of PGU screen 20 to burn out.

Referring to fig. 1 and 2, compared with the prior art, the PGU temperature detection method of the head up display of the present invention has the following advantages:

firstly, the error is small, the detection accuracy is high, the temperature of each point on the PGU screen 20 can be respectively sensed by the arrangement of the plurality of temperature sensors 21 on the PGU screen 20, the error is small, and the accuracy is high;

secondly, the detection efficiency is high, the temperature sensors 21 are in direct contact with the PGU screen 20, the sensing speed is high, and the efficiency is high;

third, can be direct, real-time detection PGU temperature, install a plurality of temperature sensor 21 that are array distribution on PGU screen 20, a plurality of temperature sensor 21 are connected with master control system respectively, through the direct temperature that detects PGU of a plurality of temperature sensor 21 and PGU contact induction, and output the detection temperature in real time through master control system, and judge whether there is the backlight irradiation on the PGU according to detecting the temperature, and judge whether PGU screen 20 is in overheated state.

In the description of the present invention, it is to be understood that terms such as "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, which indicate orientations or positional relationships, are used based on the orientations or positional relationships shown in the drawings only for the convenience of describing the present invention and for the simplicity of description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed in a particular orientation, and be operated, and thus, are not to be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The above embodiments are only specific embodiments of the present invention, and the description thereof is specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications are possible without departing from the inventive concept, and such obvious alternatives fall within the scope of the invention.

Claims

1. A PGU temperature detection method of a head-up display comprises a main control system and is characterized in that: the detection method is a method for detecting the temperature of the PGU by installing a plurality of temperature sensors which are respectively connected with the master control system on the PGU screen of the HUD so as to obtain the temperatures of a plurality of positions on the PGU screen in real time; the detection method can judge whether the HUD generates sunlight and reversely irradiates the PGU screen according to the temperatures of the multiple positions on the PGU screen, which are acquired by the multiple temperature sensors.

2. The PGU temperature detection method of claim 1, wherein: the temperature sensor is connected with the PGU screen in a direct contact mode.

3. The PGU temperature detection method of claim 2, wherein: the temperature sensors are distributed in other areas than the image display area on the PGU screen.

4. The PGU temperature detection method of claim 3, wherein: the plurality of temperature sensors are distributed in an array.

5. The PGU temperature detection method of claim 4, wherein: the plurality of temperature sensors convert the sensed temperature change into electric signals respectively and feed back the electric signals to the master control system, and the master control system obtains the temperature difference value between the maximum temperature and the minimum temperature according to the maximum temperature and the minimum temperature in the fed-back electric signals.

6. The PGU temperature detection method of claim 5, wherein: setting a PGU preset temperature in a master control system, wherein the preset temperature is 10 ℃.

7. The PGU temperature detection method of claim 6, wherein: and comparing the temperature difference value obtained by the master control system with a preset temperature to judge whether the HUD generates sunlight and irradiates the PGU screen.

8. The PGU temperature detection method of claim 7, wherein: if the difference of maximum temperature and minimum temperature is not more than presetting the temperature, then the normal work demand of HUD is satisfied to the PGU temperature, and at this moment, there is not sunlight reverse irradiation on the PGU screen.

9. The PGU temperature detection method of claim 7, wherein: if the difference of maximum temperature and minimum temperature surpasses and predetermines the temperature, then the PGU temperature is overheated, can't satisfy HUD's normal work demand, at this moment, judges that there is sunlight reverse light irradiation on the PGU screen, and master control system sends the warning.