Visual fatigue testing device for driver

Abstract

The utility model relates to the technical field of visual fatigue testing, and discloses a driver visual fatigue testing device which comprises a detection unit and an auxiliary unit. The detection unit comprises a test robot and a light acquisition analyzer which are electrically connected; the test robot is arranged on a cockpit seat and comprises a head simulation assembly. An optical reaction electronic skin is arranged on the outer surface of the head simulation assembly; simulation electronic eyes are arranged in eye sockets of the head simulation assembly; the auxiliary unit comprises a light adjusting assembly and a natural light weakening assembly which are installed at preset positions of the vehicle and used for simulating different test light environments. According to the device, different test light environments are formed through the auxiliary unit; illumination intensity borne by the head and the eyes is collected through the optical reaction electronic skin and the analog electronic eyes, so that relevant data of visual fatigue testing in different light environments are obtained, the visual fatigue degree of a driver is compared and analyzed, the structure is simple, adjustment is convenient and fast, and adaptability is high.

Description

Technical Field

[0001] The utility model relates to the technical field of visual fatigue testing, in particular to a device for testing driver visual fatigue. Background Art

[0002] During driving, the different intensities of light in the cabin, as well as the display screen and instrument lights, all have a certain stimulating effect on the driver's visual perception, which will cause visual fatigue for a long time. Especially with the popularization of smart cars, the light generated by various screens such as the Dalian screen used in the center console has a greater impact on visual fatigue.

[0003] Currently, most conventional visual fatigue tests are conducted on real vehicles. It is difficult to control the angle and brightness of light in the vehicle, making it difficult to obtain test scenes under different lighting environments, resulting in poor test results and low test accuracy. In addition, the device structure is unreasonable, the adjustment is difficult, and it takes a lot of time and manpower costs. Utility Model Content

[0004] The utility model aims to provide a driver visual fatigue testing device, which is used to solve the technical problem of low accuracy of the existing visual fatigue testing.

[0005] The basic scheme provided by the utility model is: a driver visual fatigue testing device, comprising a detection unit and an auxiliary unit; the detection unit comprises an electrically connected test robot and a light collection analyzer; the test robot is arranged on a cockpit seat, and comprises a head simulation component; the outer surface of the head simulation component is provided with an optically reactive electronic skin; the eye socket of the head simulation component is provided with a simulated electronic eye; the auxiliary unit comprises a light adjustment component and a natural light attenuation component installed at a preset position of the vehicle for simulating different test light environments.

[0006] The working principle and advantages of the utility model are as follows: the device weakens the external light in the cockpit through the natural light attenuation component, and simulates different light sources through the light adjustment component to form different test light environments; the light intensity received by the head and eyes is collected through optical reaction electronic skin and simulated electronic eyes to obtain relevant data of visual fatigue test under different light environments. The device can be used to independently test the visual fatigue data caused by the light of the vehicle's center console and instrument panel to the head and eyes, and can also be used to test the visual fatigue data caused by different light intensities and the light of the center console and instrument panel to the head and eyes at the same time, and compare and analyze the visual fatigue degree of the driver under multi-dimensional conditions; the structure is simple, the adjustment is convenient, and the adaptability is strong. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] Figure 1A photoelectric circuit diagram of a driver visual fatigue testing device provided by an embodiment of the utility model;

[0008] Figure 2 A characteristic curve diagram of the output current and light intensity of a photodiode of a driver visual fatigue testing device provided by an embodiment of the utility model;

[0009] Figure 3 A schematic diagram of the structure of a fixing bracket provided in an embodiment of the utility model;

[0010] Figure 4 A schematic diagram of the structure of a light adjustment assembly provided by an embodiment of the utility model;

[0011] Figure 5 This is a schematic diagram of the three-dimensional structure of the natural light attenuation component provided by an embodiment of the utility model. DETAILED DESCRIPTION

[0012] The following is a further detailed description through specific implementation methods:

[0013] The marks in the drawings of the specification include: lighting adjustment component 1, lamp holder 101, lamp 102, lampshade 103, rotating seat 104, telescopic rod 105, sliding mechanism 106, natural light attenuation component 2, roller blind 201, fixing buckle 202, translucent flexible black film 203, fixing shaft 204, roller 205, hook 206; fixed bracket 3, frame 301, back plate 302, seat plate 303, connecting plate 304, rotating mechanism 305.

[0014] The embodiment is basically as shown in the attached Figure 1 , Figure 3 , Figure 4 and Figure 5 Shown: A driver visual fatigue testing and analysis device includes a detection unit and an auxiliary unit.

[0015] The detection unit includes an electrically connected test robot and a light collection analyzer; in this embodiment, the test robot is arranged on a seat in the cockpit.

[0016] The test robot comprises a head simulation component and a fixing bracket for fixing the head simulation component; the outer surface of the head simulation component is provided with an optically reactive electronic skin, and a simulated electronic eye is provided in the eye socket of the head simulation component.

[0017] The light collection analyzer includes a plurality of first photosensors arranged on the optically reactive electronic skin and a second photosensor group simulating an electronic eye; the plurality of first photosensors and the second photosensor group are connected to a photoelectric circuit in a preset parallel manner; the photoelectric circuit is connected to a microcontroller.

[0018] The middle layer of the optically reactive electronic skin is provided with a plurality of conductive wires; each of the conductive wires is connected to a plurality of first photosensitive sensors, and the plurality of first photosensitive sensors are attached to the outer surface of the optically reactive electronic skin. The first photosensitive sensor is used to convert the light signal irradiated on the electronic skin into an electrical signal and output it as comparison data; the plurality of first photosensitive sensors are provided to collect multiple sets of data and compare the multiple sets of data to ensure the accuracy of the data, and the specific collection method is implemented by the existing technology.

[0019] The shell of the simulated electronic eye is a transparent structure, and the suitable transparent material is to ensure that the shell of the simulated electronic eye does not affect the light intensity when simulating the human eyeball realistically; a second photosensor group is arranged in the simulated electronic eye.

[0020] The first photosensor on the electronic skin and the second photosensor group in the eye frame are two different types of sensors. The first photosensor on the electronic skin has only the function of photoelectric conversion and can be regarded as a photosensor of the photoresistor type, that is, each of the first photosensors is a photosensor of the photoresistor type; each of the second photosensor groups includes three photodiodes, and the colors corresponding to the three different photodiodes are green, red and blue, respectively, corresponding to green light, red light and blue light (such as Figure 1 (indicated in the dashed box).

[0021] Overall, no matter what the situation is, the first photosensitive sensor of the electronic skin is always connected in parallel with the second photosensitive sensor group of the eye socket. Separately, the second photosensitive sensor groups at the eye socket are connected in parallel with each other; the first photosensitive sensors of all parts of the electronic skin are separated, that is, they are divided into two arm first photosensitive sensor groups, the first body first photosensitive sensor group and the first head first photosensitive sensor group according to the setting position, and are connected in parallel with the second photosensitive sensor group in a preset manner. The preset method includes: 1. The first photosensitive sensors of the three parts of the arm, body and head are connected in parallel, and the sensors in each part are connected in series; the two arm first photosensitive sensor groups, the first body first photosensitive sensor group and the first head first photosensitive sensor group are divided into three paths, forming a parallel circuit with the second photosensitive sensor group to connect to the photoelectric circuit. 2. All the first photosensitive sensors in the photon skin are connected in series; they form a parallel circuit with the second photosensitive sensor group to connect to the photoelectric circuit. The first photosensitive sensor of the electronic skin is not connected to the diode, but directly amplifies the signal through the signal amplifier and finally transmits it to the collector.

[0022] Specifically, Figure 1As shown, the photoelectric circuit includes several current-voltage converters; the first photosensor is connected to a current-voltage converter; each photodiode of the second photosensor group is connected to a current-voltage converter, and the function of the current-voltage converter in this circuit is to amplify the electrical signal to facilitate the subsequent reading and analysis of the light intensity; each current-voltage converter is connected to a ∑-Δ analog-to-digital converter to convert the test value into digital data for subsequent comparison and processing, and all the ∑-Δ analog-to-digital converters are connected to the microcontroller through the collector, so that the entire photoelectric circuit is finally connected to the microcontroller to classify and organize the data for subsequent analysis.

[0023] Depending on the light intensity, more or less current will flow through the photodiode. The relationship between current and light intensity is approximately linear, such as Figure 2 As shown, the figure shows the characteristic curves of output current and light intensity of red (CLS15-22C / L213R / TR8), green (CLS15-22C / L213G / TR8) and blue (CLS15-22C / L213B / TR8) photodiodes.

[0024] The relative sensitivities of the red, green, and blue diodes are different, so the gain of each stage must be determined individually through the feedback resistor RFB during use. To this end, the short-circuit current (ISC) of each diode must be obtained from the data sheet, and then the sensitivity S (pA / lux) is obtained at the operating point determined by it. The calculation formula for RFB is as follows:

[0025]

[0026] Where VFS,(PP) represents the desired full output voltage range and SXINTMAX represents the maximum light intensity, which is 100,000 lux for direct sunlight.

[0027] Analog-to-digital conversion: current-to-voltage conversion. High-quality current-to-voltage conversion requires the bias current of the operational amplifier to be as small as possible, because the output current of the photodiode is in the picoampere range, and a large bias current will cause considerable errors. The offset voltage should also be very small. ADI's AD8500 is an ideal choice for such applications, with a typical bias current of 1pA and a maximum offset voltage of 1mV.

[0028] Analog-to-digital conversion: For further processing of the measured value, the photodiode current is converted into a voltage and must be provided to the microcontroller as a digital value. For this purpose, an ADC with multiple differential inputs can be used, such as the 16-bit AD7798. Therefore, the output code of the measured voltage is as follows:

[0029]

[0030] Where AIN is the input voltage, N is the number of bits, GAIN is the gain factor of the internal amplifier, and VREF is the external reference voltage. To further reduce noise, common-mode and differential filters are used at each differential input of the ADC, and all components are very power-saving, making this circuit very suitable for battery-powered portable field applications.

[0031] The detection unit also includes a fixing bracket for fixing the head simulation component; Figure 3 As shown, the fixed bracket includes a skeleton 301, a back plate 302, a seat plate 303 and a connecting plate 304; the head simulation component is movably connected to the connecting plate 304 through a hinge; the connecting plate 304 is movably connected to the skeleton 301 through a rotating mechanism 305; the rotating mechanism 305 includes an inner turntable and an outer turntable; a circular through hole is provided in the middle of the inner turntable; four screw holes are provided at the quarter points of the inner turntable; an inner groove is provided on the bottom surface of the outer turntable; the diameter of the inner groove is consistent with the outer contour diameter of the inner turntable; the design of the two turntables enables the robot's head simulation component to rotate left and right; the back plate 302 and the seat plate 303 are movably connected through a hinge; the back plate 302 and the seat plate 303 are both movably connected to the skeleton 301, Figure 3 The skeleton 301 part connecting the back plate 302 and the seat plate 303 is a movable part, which has a middle rotatable part, and both ends are fixed on the back plate 302 and the seat plate 303 respectively. The angle of the back plate 302 and the seat plate 303 can be adjusted by the cooperation of the middle rotatable part and the hinge between the back plate 302 and the seat plate 303. Because the seat structure of each car is not consistent, the angle relationship between the backrest and the seat cushion is also not certain. The purpose of setting the hinge is to ensure that the back plate 302, the seat plate 303 and the fixed bracket of the fixed bracket can adjust the angle to fit the different angles of different seats.

[0032] The auxiliary unit includes a light adjustment component 1 of a lamp 102 and a natural light attenuation component 2 installed at a preset position of the vehicle for simulating different test light environments. The auxiliary unit is an auxiliary structure of the detection unit, which is used to control the light and dark environment in the cabin and simulate visual fatigue detection under different light and dark intensities. The light adjustment component 1 of the lamp 102 can be set on the inner wall of the roof, and the natural light attenuation component 2 can be set on both sides of the windshield.

[0033] like Figure 4As shown, the light adjustment assembly 1 includes a lamp holder 101, a lamp 102, a lampshade 103, a rotating seat 104, a telescopic rod 105 and a sliding mechanism 106, wherein the lamp holder 101 is detachably connected to the lamp 102, the lampshade 103 is fixedly connected to the lamp holder 101, and the end of the lamp holder 101 away from the lampshade 103 is connected to the telescopic rod 105 through the rotating seat 104, wherein the lamp holder 101 is fixedly connected to the rotating seat 104; one end of the telescopic rod 105 is connected to the end of the rotating seat 104 away from the lamp holder 101; the sliding mechanism 106 includes a sliding plate and a slide rail in sliding connection; the other end of the telescopic rod 105 is connected to the sliding plate; the slide rail has a detachable connection structure for detachably connecting to the test installation position of the light adjustment assembly 1, such as the top of the cabin. The sliding structure does not set a motor or other structure to control the position of the lamp, but uses manual adjustment to adjust it. The advantage of this setting is that manual adjustment can more accurately move the lamp to the required light source point.

[0034] like Figure 5 As shown, the natural light attenuation component 2 includes a rolling curtain 201, a fixing buckle 202, a fixing shaft 204 and a roller 205; the two ends of the fixing shaft 204 are used to be fixed at the preset positions of the natural light attenuation component 2; the roller 205 is sleeved on the fixing shaft 204; springs are provided at both ends of the roller 205; the ends of the two springs away from the roller 205 are respectively fixedly connected to the two ends of the fixing shaft 204; the rolling curtain 201 is a double-layer structure, with a light-shielding film 203 sandwiched in the middle The rolling curtain 201 can be a sparse gauze, and the shading film 203 can be a translucent flexible black film 203; one end of the rolling curtain 201 is fixed on the roller 205, and the other end is connected with a fixing buckle 202; a pull hook 206 is provided on the fixing buckle 202; the rolling curtain 201 with the black film is pulled out by the pull hook, and the springs at both ends of the roller 205 are tightened accordingly, and the fixing buckle 202 and the pull hook are loosened, and under the action of elastic potential energy, the rolling curtain 201 with the black film automatically shrinks back to the roller 205.

[0035] The natural light attenuation components 2 can be set in multiple groups and stacked front and back. By stacking multiple layers of black film, it is possible to block external light and minimize the external light source in the cockpit. In addition, opaque curtains are set on the windows on both sides of the cockpit to make the external light source in the cockpit invisible. The environment at this time is used to test the impact of the in-vehicle instruments on visual fatigue.

[0036] When the device is used, the main process is as follows:

[0037] S1, connect all components of the device in a preset manner and place them at preset positions; then start the test;

[0038] S2, visual fatigue test under different light environments, including:

[0039] S21, visual fatigue test of internal light source, pull out the black film in the natural light reduction component 2, and pull out the opaque curtains on the windows on both sides of the cabin to create an environment without external light source in the cabin; start the car, pull the handbrake, simulate the electronic eye to align the car's center console and instrument, and use the optical reaction electronic skin and the photosensitive sensor group simulating the electronic eye through the photoelectric circuit to collect basic data of visual fatigue;

[0040] S22, simulate the visual fatigue test of the light source, pull out the black film in the natural light attenuation component 2, and pull out the opaque curtains on the windows on both sides of the cabin to form an environment without external light source in the cabin, manually move the light structure of the lamp 102, adjust the length of the telescopic rod 105, and move the lamp 102 to a point where a light source is needed. After the light adjustment structure of the lamp 102 is adjusted in place, turn on the light of the lamp 102, and adjust the different intensities of the light of the lamp 102. Under different light intensity ranges of the lamp 102, use the optical reaction electronic skin and the photosensitive sensor group simulating the electronic eye through the photoelectric circuit to collect basic data of visual fatigue;

[0041] S23, natural light visual fatigue test, without using auxiliary components, under natural light intensity, using optically reactive electronic skin and a group of photosensors simulating electronic eyes through photoelectric circuits to collect basic visual fatigue data;

[0042] S3, compares the basic data of visual fatigue under different light environments and analyzes the degree of visual fatigue of the driver.

[0043] Each test manufacturer sets different standards. Conventional visual fatigue test data includes the number of blinks, yawns, line of sight shifts, and eye astigmatism within a certain period of time, so as to conduct comparative tests. In this embodiment, cameras and eyebrow cameras can be added and connected to the control unit to collect relevant data, and the number of blinks, line of sight shifts, eye astigmatism, conventional eye angles, and test eye angles are used for comparison. The specific comparison method and the algorithm used to evaluate and analyze the degree of visual fatigue of the driver can be achieved through existing technologies, and will not be repeated here.

[0044] A driver visual fatigue testing device provided by the present embodiment has a simple structure, convenient adjustment and strong adaptability. It reduces external light in the cockpit through a natural light attenuation component, and simulates different light sources through a light adjustment component to form different test light environments. It collects light intensity received by the head and eyes through optical reaction electronic skin and simulated electronic eyes to obtain relevant data of visual fatigue testing under different light environments, and based on this, combined with a microcontroller, analyzes the driver's visual fatigue level. The device can be used to independently test the visual fatigue data caused by the light of the vehicle's center console and instrument panel on the head and eyes, and can also be used to test data of visual fatigue caused by different light intensities and the light of the center console and instrument panel on the head and eyes at the same time, and compare and analyze the driver's visual fatigue levels obtained in multiple dimensions.

[0045] The above is only an embodiment of the utility model. The common sense such as the known specific structure and characteristics in the scheme is not described in detail here. The ordinary technicians in the relevant field are aware of all the common technical knowledge in the technical field of the utility model before the application date or priority date, can obtain all the existing technologies in the field, and have the ability to apply the conventional experimental means before that date. The ordinary technicians in the relevant field can improve and implement the scheme in combination with their own abilities under the enlightenment given by this application. Some typical known structures or known methods should not become obstacles for ordinary technicians in the relevant field to implement this application. It should be pointed out that for the technicians in this field, without departing from the structure of the utility model, several deformations and improvements can be made, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent.

Claims

1. A driver visual fatigue testing device, characterized in that: It comprises a detection unit and an auxiliary unit; the detection unit comprises an electrically connected test robot and a light collection analyzer; the test robot is arranged on a cockpit seat and comprises a head simulation component; an optically responsive electronic skin is arranged on the outer surface of the head simulation component; a simulated electronic eye is arranged in the eye socket of the head simulation component; the auxiliary unit comprises a light adjustment component and a natural light attenuation component installed at a preset position of the vehicle for simulating different test light environments.

2. A driver visual fatigue testing device according to claim 1, characterized in that: The light collection analyzer includes a plurality of first photosensors arranged on the optically reactive electronic skin and a second photosensor group simulating an electronic eye; the plurality of first photosensors and the second photosensor group are connected to a photoelectric circuit in a preset parallel manner; the photoelectric circuit is connected to a microcontroller.

3. A driver visual fatigue testing device according to claim 2, characterized in that: The middle layer of the optically reactive electronic skin is provided with a plurality of conductive wires; each of the conductive wires is connected to a plurality of first photosensitive sensors, and the plurality of first photosensitive sensors are attached to the outer surface of the optically reactive electronic skin; the outer shell of the simulated electronic eye adopts a transparent structure.

4. A driver visual fatigue testing device according to claim 2, characterized in that: The first photosensor is a photoresistor photosensor; each of the second photosensor groups includes three photodiodes; a plurality of current-voltage converters are provided in the photoelectric circuit; one of the first photosensors is connected to one of the current-voltage converters; one of the photodiodes is connected to one of the current-voltage converters; the output end of each of the current-voltage converters is connected to a ∑-Δ analog-to-digital converter; All of the sigma-delta analog-to-digital converters are connected to a microcontroller via a collector.

5. A driver visual fatigue testing device according to claim 2, characterized in that: The preset parallel connection mode is that a plurality of first photosensors are divided into two arm first photosensor groups, a body first photosensor group and a head first photosensor group according to the installation positions, wherein all the first photosensors in each position are connected in series; the two arm first photosensor groups, the body first photosensor group and the head first photosensor group are divided into three paths, forming a parallel circuit with the second photosensor group and connected to the photoelectric circuit.

6. A driver visual fatigue testing device according to claim 2, characterized in that: The preset parallel connection mode is that after all the first photosensitive sensors are connected in series, they form a parallel circuit with the second photosensitive sensor group and are connected to the photoelectric circuit.

7. A driver visual fatigue testing device according to claim 1, characterized in that: The detection unit also includes a fixing bracket for fixing the head simulation component; the fixing bracket includes a frame, a back plate, a seat plate and a connecting plate; the head simulation component is movably connected to the connecting plate; the connecting plate is movably connected to the frame through a rotating mechanism; the back plate and the seat plate are both movably connected to the frame.

8. A driver visual fatigue testing device according to claim 7, characterized in that: The rotating mechanism includes an inner turntable and an outer turntable; a circular through hole is provided in the middle of the inner turntable; four screw holes are provided at the quarter points of the inner turntable; an inner groove is provided on the bottom surface of the outer turntable; the diameter of the inner groove is adapted to the outer contour diameter of the inner turntable so that the head simulation component can rotate left and right.

9. A driver visual fatigue testing device according to claim 1, characterized in that: The light adjustment assembly includes a lamp holder, a lamp, a lampshade, a rotating seat, a telescopic rod and a sliding mechanism, wherein the lamp holder is detachably connected to the lamp, the lampshade is fixedly connected to the lamp holder, and one end of the lamp holder away from the lampshade is fixedly connected to the rotating seat; one end of the telescopic rod is connected to one end of the rotating seat away from the lamp holder; the sliding mechanism includes a sliding plate and a sliding rail in sliding connection; the other end of the telescopic rod is connected to the sliding plate; and the sliding rail has a detachable connecting structure.

10. The driver visual fatigue testing device according to claim 1, characterized in that: The natural light attenuation component includes a rolling blind, a fixing buckle, a fixed shaft and a drum; the drum is mounted on the fixed shaft; springs are provided at both ends of the drum; the ends of the two springs away from the drum are respectively fixedly connected to the two ends of the fixed shaft; the rolling blind is a double-layer structure with a shading film in the middle; one end of the rolling blind is fixed to the drum, and the other end is connected to the fixing buckle; a draw hook is provided on the fixing buckle.

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