KR100980489B1 - Method and apparatus for alarming driving in sleep responsive to vehicle motion and speed - Google Patents

Abstract

The present invention relates to a device for detecting and alerting a driver's drowsiness while driving a vehicle, and determining and warning a driver's drowsiness by analyzing a movement form and speed of a driving vehicle and a driver's driving posture. Driver drowsiness detection and warning device according to the present invention, the analog sensor (three-axis acceleration sensor) unit for detecting the movement form of the vehicle to transmit to the central control unit; Speed detection unit for detecting the current driving speed of the vehicle, Infrared sensor (infrared distance sensor) unit for detecting the movement of the driver's head, Central control unit for reading the sensor value and comparing the speed value of the car and outputs a warning signal, Warning sound module for outputting a warning sound according to the signal output from the central control unit, the driver includes a warning level selection switch for selecting the warning level according to their body condition. According to the present invention, since the driver's drowsy driving alarm time is determined according to the driving type and speed of the vehicle, a false alarm rate of the warning sound is low and an alarm is issued immediately at a high speed to prevent a large accident, as well as a sensor that is affected by the environment such as a camera. Since there is no false alarm due to the change of surrounding environment, it is possible to analyze the motion information of the car so that the alarm can be alerted.

Description

Drowsiness driving warning method and apparatus corresponding to vehicle driving type and speed {Method and apparatus for alarming driving in sleep responsive to vehicle motion and speed}

The present invention is a device for detecting and warning the drowsiness of the motor vehicle driver, more specifically, in addition to analyzing the driver's driving posture to determine and warn the driver's drowsiness in consideration of the driving form and speed factors of the driving vehicle A method and apparatus are disclosed.

Automobiles have evolved since the invention, and as a result, the demand has increased exponentially and people's lives have changed drastically due to the expansion of roads and the construction of other infrastructures related to automobile operation. Cars travel faster and farther, greatly reducing time and space constraints. In particular, as automobiles are recognized as a space where economic activity is extended from simple means of transportation, the functions of automobiles are becoming more diverse. Due to such a change, the average driver is using a long time.

The key to recent automotive technology is comfort and safety. This is due to the increase in the driving speed of the car, the increase of the driving distance and the driving time, and the increase in the number of driving vehicles. These car accidents not only increase social costs but also have a very serious impact on the individual driver. In addition to property damage, when the damage of life occurs, the damage is more serious and is a very serious social problem.

When the researches for preventing traffic accidents are classified by field, the road and traffic signal system that influences the driving environment of the vehicle, the improvement of the performance of the vehicle and the education of the driver who drives the vehicle are included. Research related to the driving environment of automobiles has been studied in various fields in various fields. As the technology applied to the roads on which the automobiles are driven, the intelligent which indicates lane allocation or driving direction when driving the automobiles by combining various electronic or IT technologies There are roads, etc., and when the natural environment deteriorates due to snow rain, it is quickly removed to prevent slippage due to water film phenomenon or freezing. In addition, when visibility is limited at night, a reflector or lighting may be installed to keep the marking of the lane above a certain level of illumination so as to prevent an accident due to lane departure. Basic facilities include speed bumps, uneven sections, and high slip coefficients to prevent slippage. The research related to these roads has the disadvantage of being expensive and time-consuming, despite their utility, and the progress of the research is very slow and the application is much slower.

The study of the traffic signal system is essential to increase the road utilization rate by smoothing the flow of cars on the road, and to prevent accidents due to wrong driving methods such as frontal collisions or side collisions between cars on complex roads with complex road structures. In the general traffic signal control, the waiting time for switching to the next signal is set in the same context. The traffic signal has a signal such as a large stop, waiting, etc. There is an effect of preventing an accident due to predicted driving by giving a waiting time when switching to each signal and notifying the driver of the remaining time of switching to the next signal.

Research on automobiles to prevent and prevent damage from traffic accidents is more active than ever. This is because research related to the field is rapidly conducted by the automaker, and the result is directly related to the profit of the automaker. Safety devices in cars include seat belts or airbags that secure the driver's or occupant's body to the seat to reduce secondary accidents caused by collisions with other structures. In addition, the vehicle structurally, the shock absorbing structure is designed so that the impact of the collision is not transmitted to the inside of the vehicle. Its role is to absorb shocks from the front and rear of the car, and to exterminate the external steel plate that maintains the shape of the vehicle. The steering device that determines the direction of the car also responds to the driving speed, making the operation more difficult in high-speed driving, so as to prevent overturning accidents due to sudden turning in high-speed driving. To prevent lane departure from turning, the driver operates the brakes sequentially in several stages. This sequential operation can stop the vehicle quickly and accurately to prevent secondary accidents due to collisions and lane departures. In addition, the cameras are installed in various places of the car to provide the driver with information about blind spots of view, making driving safer.

As such, various facilities and technologies are introduced to provide services to the driver and the driver's safe driving on the road. The provision of such services is because, in the event of a traffic accident, the damage is not a matter of a specific individual but a society.

To this end, public relations for traffic accidents and driver retraining for safe driving are being conducted.

However, the driver is also responsible for the intelligent road service, various safety driving auxiliary facilities and information providing system, efficient traffic control signal system, and various driving-related information provided to the driver while driving the vehicle and safety equipment to protect the driver. If you use it properly or do not operate it properly for some reason, you will not see the effect. In particular, when the driver is dozing, the driver's consciousness is less than drunk driving, and thus the ability to cope with an accident risk is significantly lowered, causing a large accident. For this reason, drowsiness driving detection method has been researched and used in practice, but most of the current technologies are used to monitor the driver's eyes using a camera or to attach a sensor directly to the driver's body to detect driver's drowsiness.

However, this method is used in some cases because the driver is wearing glasses, such as sunglasses, wearing eyeglasses, or when the environment changes suddenly dark or bright, so that the error rate is high, and the sensor attached type detects drowsiness at all when the driver is not wearing. It is true that you cannot.

It is an object of the present invention to focus on generating a very serious traffic accident when various services or safety devices provided for preventing traffic accidents are not available when the driver is tired or drowsy due to other reasons. By analyzing the driver's behavior and the driving mode of the car without any sense of rejection or rejection, it is possible to provide a device that enables safe driving by determining whether the driver is drowsy driving and calling the driver's attention with light and warning sounds.

The drowsiness driving detection apparatus according to the present invention includes a measurement value of a driver's head position detection sensor installed in a driver's head protector and a vehicle driving type measurement sensor located inside the device to determine whether the driver is drowsy. The change value and the measured value measured by the speed sensor of the vehicle are used.

When driving a car in general, if the car runs at a constant speed, the speed change is also within a certain range. It is also common for the driver's head to be forward while driving. The driver's eyes are very important when driving a car, and other actions besides driving may cause large traffic accidents. For this reason, it is prohibited by law to obstruct the use of mobile phones or other driving while driving. In other words, if the driver keeps his gaze away from the front while driving, this is a very dangerous behavior, especially when the vehicle is driven at high speed. In addition, the risk of traffic accidents is increased even in acrobatics and slippery driving beyond the normal driving behavior. As such, the drowsiness driving detection device corresponding to the driving speed of a vehicle is provided with a plurality of sensors having different characteristics and receives respective sensor values and analyzes the correlation between the sensor values to detect abnormal postures such as abnormal driving of the car or drowsy driving of the driver. It features automatic detection in advance.

1 is a configuration diagram for explaining the concept of the drowsiness operation detection apparatus according to the present invention. Measurement values are input from the three sensors to the central control unit 10. X is the measured value of the driver's head position sensor 20 installed on the driver's head protector, Y is the measured value at the vehicle driving mode measurement sensor 30, Z is the measured value measured at the speed sensor 40 of the vehicle to be.

The X can be obtained by measuring the driver's head moving in front, rear, left and right, installed near the driver's head, and the Y is installed on the vehicle to measure the acceleration, tilt and shaking of the car by installing an analog 3-axis acceleration sensor. The Z may be a speed value measured by a sensor or a separate speed sensor interlocked with the speedometer of the vehicle. However, the type of sensor is not necessarily limited to these.

The central controller 10 performs a data collecting unit for collecting measured values input from three sensors, a data storing unit for storing collected data and processed data, and a predetermined process for solving the technical problem of the present invention. It consists of a data processing unit. The central controller 10 may be implemented as a microcomputer or a microcontroller that stores a predetermined microprogram to perform a predetermined procedure, but is not limited thereto. For example, the central control unit 10 may be implemented using only hardware using discrete devices.

The warning unit 50 for warning the outside according to the processing result in the data processing unit is connected to the output terminal of the central control unit 10, the input terminal of the central control unit 10 is also selected by the user in the warning level selection unit 60 The warning level signal is input. Warning levels include the 'normal' level and the 'emergency' level. The warning unit 50 is a component that actually issues a warning by means of sound or light emission by receiving a warning signal output from the central control unit 10, and may be implemented in various ways (eg, vibration, wind, etc.). The warning level selecting unit 60 is a convenient component for allowing a user to select a warning level by himself, and may be installed as one function selection button on the dashboard of the vehicle.

2 is a flowchart illustrating a process performed by the central control unit 10 of FIG. 1, and is a process configuration diagram of the drowsiness driving method according to the present invention.

In FIG. 2, data of X (output value of the driver's head position sensor), Y (output value of the vehicle driving mode sensor), and Z (measured value measured by the vehicle speed sensor) are installed (s1).

Before processing the X data, it is determined whether the current warning level selected by the user is 'emergency' or 'normal' (s2). If it is an emergency, replace the X value with another set value X '(s3) and store it in the data storage unit (s5). If the warning level is normal, it is determined whether X is greater than the reference value Xref (s4), and if it is large, the X value is stored in the data storage unit (s5).

In the case of processing the Y data, first, it is determined whether the warning level selected by the current user is critical or normal (s6). In case of emergency, the Y value is immediately stored in the data storage without any action (s8). If the warning level is normal, it is determined whether Y is greater than the reference value Yref (s7), and if it is large, the X value is stored in the data storage unit (s8).

Regarding the Z data, first, it is determined whether the warning level currently selected by the user is emergency or normal (s9). In case of emergency, the Z value is immediately stored in the data storage without any further action (s11). If the warning level is normal, it is determined whether Z is greater than the reference value Zref (s10), and if it is large, the Z value is stored in the data storage unit (s11).

Here, X 'is a value set in advance in order to give a warning regardless of the driver's head position measured value in the case of an emergency warning level, which is set to' 10 'in the present invention, but the present invention is not limited thereto. Explained). Xref, Yref, and Zref are reference values for determining when the driver head position value, the vehicle driving type value, and the vehicle speed value are to be warned, respectively, which will be described in detail later.

Calculate W by multiplying the X, Y, and Z values stored in the data storage unit (s12). Then, it is determined whether W is larger than a predetermined reference value Wref (s13), and if it is large, a warning signal is output (s14) to cause the warning unit 50 to turn on a warning sound or a warning lamp.

That is, according to the present invention, if the value of W = X * Y * Z exceeds a predetermined reference value, a warning is issued, so that the warning is reflected by reflecting all the factors of the head position of the driver, the driving type of the vehicle, and the speed. If either increases, the warning will be issued as soon as possible. Detailed description will be described with reference to the embodiments.

According to the present invention, a vehicle traffic accident caused by drowsy driving by calling the driver's attention by automatically detecting and warning the driver's drowsy driving in advance while driving the vehicle without attaching a specific operation or attaching specific equipment to the driver's body. In addition to the indicators to determine the drowsiness of the car, the driving type and speed of the car are also used as indicators, which will be a more realistic and safer prevention of drowsy driving. Therefore, it is possible to detect and warn the driver even when the movement state of the vehicle is abnormal due to the deterioration of the driving environment such as the road, so that safety measures such as lowering the driving speed can be taken in advance.

Hereinafter, with reference to the accompanying drawings, it will be described in detail the configuration and operation of the drowsiness driving detection apparatus corresponding to the vehicle driving speed through an embodiment of the present invention.

3 is a schematic diagram showing that the drowsiness driving detection apparatus according to an embodiment of the present invention is installed in a vehicle. There is a warning module 150 with a warning level selection switch 160 in front of the driver, and a control with an analog sensor (three-axis acceleration sensor) unit 120 and a central control unit 110 under the driver's seat or at an easy installation place. There is a box 100, the infrared distance sensor 130 is installed on the driver's head protector, the speed sensor 140 is installed on the car dashboard. Referring to FIG. 3, the drowsiness driving detection apparatus according to the embodiment of the present invention has a structure that is very easy to install because each sensor unit and a warning module are configured as independent modules and can be simply connected by a connector. The driver can easily install and use.

4 is a block diagram of the drowsiness operation detecting apparatus according to an embodiment of the present invention, and shows a connection state between each component, and FIG. 5 shows a connection between each component connected to the central control unit 110 in more detail. .

4 and 5, the drowsiness driving detection apparatus according to an embodiment of the present invention is an analog sensor (three-axis acceleration sensor) unit 120, the infrared sensor (infrared distance sensor) unit around the central control unit 110 130, the speed detecting unit 140, the warning module 150, the warning level selection switch 160, and the power supply unit 170 are connected. The central control unit 110 receives signals from the analog sensor unit 120, the infrared sensor unit 130, and the speed detecting unit 140, analyzes the correlation between the signals, and determines the output time of the warning signal. Transmit the warning data.

The central controller 110 may be implemented using a microcomputer. In this embodiment, PIC18F877 is used as a microcomputer used in the central control unit, but it is apparent to those skilled in the art that the microcomputer can be implemented using the same or higher microcomputer. MICOM PIC18F877 is a chip (RISC CPU) with a built-in arithmetic function and ROM and RAM.It has a maximum clock of 20MHz and a 10-bit AD converter (Analog-Digital) that converts analog signals into digital signals. 8 built-in converters and 24 general digital ports.

Analog sensor unit 120 includes a three-axis acceleration sensor of the x, y, z axis, the connection method with the microcomputer is as shown in FIG. Infrared sensor unit 130 includes three infrared distance sensor as shown in Figure 4, the connection method is as shown in FIG. The infrared distance sensor 1, the infrared distance sensor 2, and the infrared distance sensor 3 are respectively installed on the right, left, and center of the head protector to detect the position of the driver's head. The signal input to the microcomputer from the analog sensor unit 120 and the infrared sensor unit 130 is an analog voltage between 0 and 5VDC.

Referring to FIG. 5, the voltage of the analog sensor unit 120 is input through the connection connector CN1-1, and the x-axis input value is input to the analog port AN0, the second pin of the microcomputer, and the y-axis input value is the third pin of the microcomputer. It is input to analog port AN1, and z-axis input value is input to analog port AN2, pin 4 of microcomputer.

The right infrared distance sensor input value of the infrared sensor unit 130 is input to the analog port AN3, which is pin 5 of the microcomputer, and the left infrared distance sensor input value is input to the analog port AN4, which is pin 7 of the microcomputer, and the central infrared distance sensor input is input. The value is input to analog port AN5, pin 8 of microcomputer.

The speed pulse input signal of the speed detecting unit 140 is input to the digital port RA4 of the microcomputer through the connection connector CN2-1 (pin 6). The signals input to MICOM's analog ports AN0-AN5 are analog voltages between 0 and 5VDC, respectively, and these voltages are converted into 10-bit digital signals in the AD converter inside the microcomputer. Table 1 below is a rough conversion table of typical analog voltage and digital signal values, and it can be seen that the values between the representative values are linear.

number Analog voltage Digital signal number Analog voltage Digital signal One 0 VDC 0 6 3.0VDC 615 2 0.5VDC 102 7 3.5VDC 716 3 1.0VDC 204 8 4.0VDC 820 4 1.5VDC 225 9 4.5VDC 921 5 2.0VDC 410 10 5.0VDC 1024

The speed pulse input signal of the speed detecting unit 140 input to the digital port RA4 of the microcomputer is a pulse type having a ratio of high to low signal of 1: 1, and 660 pulses are input when the vehicle is driven 1000m. . Table 2 shows the correlation between the mileage, speed and pulse per second.

number Per hour (km) Mileage per second (M) Pulses per second Seconds per pulse One 0 0 0 ∞ 2 10 2.7 1.8 0.54 3 20 5.5 3.6 0.27 4 30 8.3 5.5 0.18 5 40 11.1 7.3 0.13 6 50 13.8 9.1 0.1 7 70 19.4 12.8 0.07 8 90 25 16.5 0.06 9 100 27.7 18.3 0.05

As such, the central control unit 110 of the drowsiness operation detecting apparatus according to the embodiment of the present invention receives signals from the analog sensor unit 120, the infrared sensor unit 130, and the speed detecting unit 140, which are each independently operated. The procedure of outputting a warning signal by receiving the value of each sensor in the central control unit 100 is as follows.

When the driver progresses from the normal driving state to the drowsy driving stage, the driver's body gradually relaxes and the level of consciousness decreases. When the body is relaxed and the level of consciousness is lowered, the human body is unable to maintain a normal posture and the head is biased to either side.

6 is a view of the driver's head as seen from above. Table 3 shows the distance change with each sensor according to the driver's head position in order to visualize the measured value of the infrared distance sensor according to the driver's head position. As shown in Table 3, the output values of the three infrared distance sensors (right sensor, left sensor and center sensor) installed in the head protector will change according to the driver's head position. Use this value to know the current driver's head position. According to the results of the traffic experts, the safest driver's head position while driving is ideally 10 cm between the head restraint and the head, and the center of the head restraint matches the driver's ear.

Sensor Classification Normal posture Left attitude Posture to the right Posture Posture Right sensor 12 cm 30 cm 10 cm 22 cm 5 cm Center sensor 10 cm 11 cm 11 cm 20 cm 3 cm Left sensor 12 cm 10 cm 30 cm 22 cm 5 cm

As shown in FIG. 6 and Table 3, using the three infrared distance sensor values can determine the driver's head movement in real time. When the difference between the largest and smallest values of the three infrared sensor values is called the head movement value (X) , the head movement value (X) = (largest value—the smallest value) . However, if the values of all three infrared sensors are 2 cm or less, * 5 (multiplied by 5) is applied to the result of the above formula. That is, if the values of all three infrared sensors are 2 cm or less, the head movement value (X) = (largest value—smallest value) * 5 . The larger the head movement value X is, the more the driver distracts while driving or the head is tilted to either side due to drowsiness.

The driving mode of the vehicle can also be measured using the output value of the 3-axis acceleration sensor. The value of the 3-axis acceleration sensor of the analog sensor unit 120 measures the change in the driving mode of the vehicle in units of 1 ms and is input to the microcomputer as an analog voltage of 0 to 5 VDC, which is converted into a digital signal value and used. Table 4 shows the result of converting the analog output value of the 3-axis acceleration sensor into a digital signal in the AD converter of the central controller. The values shown in Table 4 apply equally to the 3-axis values of x, y, and z, which are outputs of the 3-axis acceleration sensor.

Digital value 0 4 8 16 32 64 128 256 512 1024 Sensitivity 1 0g 5.85mg 11.71mg 23.43mg 46.87 mg 93.75mg 187.5 mg 0.375 g 0.75 g 1.5 g Sensitivity 2 0g 23.43mg 46.87 mg 93.75mg 187.5 mg 0.375 g 0.75 g 1.5 g 3 g 6 g

 In the microcomputer of the central control unit 110, the speed detection unit 140 has a value of Table 2, the analog sensor unit 120 has a value of Table 4, and the infrared sensor unit 130 has a value of Table 3. Warning issued by the central control unit 110 is determined in consideration of all the values of each sensor. When the car is stopped (car speed '0'), there is no warning and the car speeds up. In addition, if the driver's head is within the normal range (when the head movement value X <5) by reflecting the output value of the infrared sensor unit 130, no warning is output. However, if the driver selects the warning level selection switch 160 as 'emergency', a warning is output when the value of the analog sensor unit 120 is equal to or greater than the set value (for example, the digital value 256) regardless of the position of the driver's head.

When the warning level selection switch 160, which is a general use case, is in the 'normal' position, the warning signal output is as follows. When the head movement value measured by the infrared sensor unit 130: X, the value of the driving mode of the car measured by the analog sensor unit 120: Y, the speed value of the car measured by the speed detecting unit 140: Z, The alarm is issued under the condition of 7560 <(X-5) * Y * Z. However, when the warning level selection switch 160 is located in the 'emergency', the constant '10' is applied instead of the head motion value X without applying the head motion value X (the value X described above). That is, the condition of the warning is 7560 <10 * Y * Z. As shown in the equation, if the vehicle moves in a straight line without changing the speed, that is, when the analog sensor 120 is '0' or the like and when the head movement value X is '5' or less, no alarm is output. Also, if the speed is '0', no warning is issued.

As such, it can be seen that the output of the warning signal is output earlier as the speed increases, the greater the speed change of the vehicle, and the larger the head movement. The reason for this is that if you move your head severely in high-speed driving, you lose concentration and the risk of an accident is high, and the change in the speed of the three axes (x, y, z) in the car is severe. Because it is the case. In the case of drowsy driving, the head movement of the driver is largely out of the normal position, and the head movement value (X) is large and the driving is not smooth, and thus the left and right movement of the car occurs, so that the output value of the analog sensor unit 120 is rapidly increased.

By applying the above procedure to the warning output, if a drowsy operation occurs, a warning is possible immediately.

7 is a more detailed circuit diagram of the analog sensor unit 120 of the drowsiness operation detection apparatus according to an embodiment of the present invention. The analog sensor unit 120 of the drowsiness driving detection apparatus corresponding to the vehicle driving speed of the present invention measures the instantaneous speed change (ie, acceleration) of the vehicle. The 3-axis acceleration sensor of the analog sensor unit 120 measures the value of 1.5g to 6g according to the user's selection by the movement of the x-axis, y-axis, and z-axis in 1 ms cycle and outputs the analog voltage of 0 to 1600mV. OP AMP LM324-1, LM324-2, and LM324-3 are composed of the same circuit to amplify the output x, y, z value of 3-axis accelerometer, respectively. The output of the 3-axis acceleration sensor is 0 to 1600mV, and the value output from the AD converter of the microcomputer of the central controller 110 is 0 to 5000mV. The OP AMP LM324-1, LM324-2 and LM324-3 perform 5000mV / 1600mV = 3.125 times amplification to meet this requirement. The amplification degree AV of the OP AMP LM324-1, LM324-2, and LM324-3 is AV = (R1-1 / R2-1) +1. Since the required AV value is 3.125, 3.125-1 = R1-1 / R2-1 = 2.125, that is, (R1-1) = (R2-1) * 2.125. Therefore, when R1-1 = 21.25 ms, R2-1 may use 10 ms.

8 is a more detailed circuit diagram of the infrared sensor unit 130 of the drowsiness operation detection apparatus according to an embodiment of the present invention. The infrared sensor unit 130 of the drowsiness driving detection device corresponding to the vehicle driving speed of the present invention is composed of an OP AMP LM324-1, LM324-2, and LM324-3 that amplifies the output signal of the infrared distance sensor. . OP AMP LM324-1, LM324-2 and LM324-3 are composed of the same circuit and amplify the signals of the right, center and left sensors of the infrared distance sensor. The output of the infrared distance sensor is 400 ~ 2500mV and the AD converter output of the microcomputer of the central control unit 110 is 0 ~ 5000mV. OP AMP The LM324-1, LM324-2, and LM324-3 require 5000mV / 2500mV = 2x amplification to meet this requirement. The amplification degree AV of the OP AMP LM324-1, LM324-2, and LM324-3 is AV = (R11-1 / R12-1) +1. Since the AV value required is 2, 2-1 = R11-1 / R12-1 = 1, that is, (R11-1) = (R12-1) * 1. Therefore, since (R11-1) = (R12-1), 10 Hz is used for both R11-1 and R12-1.

9 is a more detailed circuit diagram of the speed detecting unit 140 of the drowsiness operation detection apparatus according to an embodiment of the present invention. Speed detection unit 140 of the drowsiness driving detection device corresponding to the vehicle driving speed of the present invention, the signal is electrically separated through the optical coupler (OPTO) and the optocoupler for electrically separating the automotive circuit and the device. It consists of a comparator LM2903 that accurately converts digital signals. Various signals of the vehicle vary from 5 to 24VDC depending on the vehicle.

The speed signal input to the speedometer of the vehicle is input to the light emitting diode of the optocoupler LPV817 through R21. When a current flows through the light emitting diode by the speed signal, the light emitting diode emits light to turn on the internal transistor. At this time, the maximum current that the transistor can pass is about 50% of the current flowing through the light emitting diode. If a larger load is applied, the transistor will not fully saturate, causing distortion in the waveform of the output voltage. Assuming that the voltage applied to the transistor is 5V and the current flows 1mA, R22 for satisfying this condition can be calculated by the following equation.

When voltage: 5V, current: 1mA, transistor drop: 0.3V, R22 = (5V-0.3V) /1mA=4.7mA.

If R21 is calculated under the above conditions, R21 = [(5V ~ 24V) -2.0V] / 3mA = 1㏀ ~ 7㏀ when the input voltage is 5 ~ 24V, the light emitting diode drop 2.0V, and the current is 3mA or more. . In the present invention, 1 ms was used. When R21 = 1㏀, the current at the highest voltage is (24V-2V) / 1㏀ = 22mA, so it is within 50mA.

The signal output from the optocoupler transistor is input to the '+' terminal of the comparator LM2903. R24 and R25 installed at the '-' terminal of the comparator LM2903 have the same resistance (R24 = R25 = 10Ω), so 2.5V is applied to the '-' terminal of the comparator LM2903. The signal output from the optocoupler transistor is '0 ~ 0.5V' when low and '4.4 ~ 5V' when high, so it appears as a digital signal at the output of the comparator LM2903.

10 is a more detailed circuit diagram of the warning module 150 of the drowsiness operation detection apparatus according to an embodiment of the present invention. The warning module 150 of the drowsiness driving detection device corresponding to the vehicle driving speed of the present invention oscillates using the Schmitt trigger 4538, and amplifies and outputs the transistor Q1. If both the 1st and 2nd stage warning terminals are low, the input terminals of both 4538-1 and 4538-2 are fixed to the low via diodes D101 and D102, so the Schmitt trigger 4538 cannot start the oscillation operation. Keep it. When High is input to the first stage warning terminal, the signal is blocked by the diode D101, and the 4583-1 oscillates by the time constants of R101 and C101. When the oscillation waveform becomes low, it is converted into a high signal by 4538-2, and this high signal drives transistor Q1 through R106 to drive a warning sound and a lamp. This signal appears only when the output of the 4538-1 is low, so the warning signal repeats the interruption and the sustain constantly.

When High is input to the second stage warning terminal, the signal is blocked by the diode D102, and 4583-3 is oscillated by the time constants of R102 and C102. When the oscillation waveform becomes low, the signal is blocked by D103. In 4538-4, the signal whose output is low is represented by C102, R103, D104 and the signal whose output is high is C103, R104. , Represented by D105. This high signal drives transistor Q1 through R105 to drive the beep and lamp. This signal appears only when the output of the 4538-4 is high, so the warning signal appears as a short intermittent sound.

11 illustrates the output form of the warning module 150 of FIG. As an example of the drawing, the warning sound has two types of interrupting and sustaining at regular intervals and short interrupting sounds. This is to alert the driver by changing the pattern of warning if necessary. In other words, if a shorter beeping sound is issued than a warning beeping and sustaining at regular intervals, the driver may be warned more strongly.

12 is a more detailed circuit diagram of the warning level selection switch 160 of the drowsiness operation detection apparatus according to an embodiment of the present invention. The warning level selection switch 160 of the drowsiness driving detection device corresponding to the vehicle driving speed of the present invention is a changeover switch. It is sending a signal to the microcomputer's digital port.

The circuit used in the drowsiness operation detecting apparatus according to the embodiment of the present invention described above is for illustration only, and it is obvious to those skilled in the art that the technical scope of the present invention is not limited thereto. The drowsiness driving detection apparatus according to the present invention automatically installs a plurality of sensors having different characteristics and receives each sensor value to automatically detect abnormal postures such as abnormal driving of a car or drowsy driving of a driver by reflecting each sensor value. The basic concept is what you can do. While the invention has been shown and described in connection with specific embodiments thereof, it is well known in the art that various modifications and changes can be made without departing from the spirit and scope of the invention as indicated by the claims. If you have it, you will know it easily.

1 is a schematic configuration diagram of an apparatus according to the present invention.

2 is a process flow diagram illustrating the construction of the operation and method of the device according to the invention.

Figure 3 is a schematic diagram showing the installation structure of the drowsiness operation detection apparatus according to an embodiment of the present invention.

Figure 4 is an actual configuration of the drowsiness operation detection apparatus according to an embodiment of the present invention.

5 is a circuit diagram of the central control unit of the drowsiness operation detection apparatus according to an embodiment of the present invention.

6 is a view of the driver's head as viewed from above;

7 is a circuit diagram of an analog sensor unit of the drowsiness operation detection apparatus according to an embodiment of the present invention.

8 is a circuit diagram of an infrared sensor unit of the drowsiness operation detection apparatus according to an embodiment of the present invention.

9 is a circuit diagram of a speed detection unit of the drowsiness operation detection apparatus according to an embodiment of the present invention.

10 is a circuit diagram of a warning sound module of the drowsiness operation detection apparatus according to an embodiment of the present invention.

11 is a view illustrating a warning sound output pattern of the warning sound module of FIG.

12 is a circuit diagram of a warning level selection switch of the drowsiness operation detecting apparatus according to the embodiment of the present invention.

Claims (14)

A sensor that detects the driver's head position, A sensor for measuring the driving mode of the car, A sensor to detect the speed of the car, A data collector configured to collect the output value of the driver's head position sensor, the output value from the vehicle driving mode sensor, and the measured value data measured by the vehicle speed sensor, a data storage unit for storing the collected data and the processed data; Central control unit including a data processing unit for performing a predetermined process, Including a warning unit for performing a warning action to the driver in accordance with the processing result output from the central control unit, The data processing unit of the central control unit, Means for determining whether the output value X of the driver's head position sensor falls within a reference range, and storing the X value in the data storage unit when the driver's head position sensor is out of the reference range; Means for judging whether the output value Y of the vehicle driving mode measuring sensor is larger than the reference value Yref, and storing the Y value in the data storage unit when the output value Y is large; Means for judging whether the output value Z of the vehicle speed sensor is greater than the reference value Zref and storing the Z value in the data storage unit when the output value Z is larger than the reference value Zref; Means for multiplying the X, Y, and Z values stored in the data storage unit to calculate W, judging whether W is greater than a predetermined reference value Wref, and outputting a warning signal if the W is larger, thereby performing a gold warning action. Drowsy driving warning device corresponding to the vehicle driving mode and speed, including. A sensor that detects the driver's head position, A sensor for measuring the driving mode of the car, A sensor to detect the speed of the car, A data collector configured to collect the output value of the driver's head position sensor, the output value from the vehicle driving mode sensor, and the measured value data measured by the vehicle speed sensor, a data storage unit for storing the collected data and the processed data; Central control unit including a data processing unit for performing a predetermined process, Warning unit for performing a warning action to the driver in accordance with the processing result output from the central control unit, Including a warning level selection unit for inputting a warning level signal including 'emergency' and 'normal' state to the data processing unit of the central control unit by the user's selection, The data processing unit of the central control unit, Means for determining whether the warning level signal inputted to the central control unit is 'emergency' or 'normal'; If an emergency is selected, X 'having a value unrelated to the driver's head position is set and stored, the output value Y from the vehicle driving type measurement sensor is stored in a data storage unit, and the output value Z from the vehicle speed detection sensor. Means for storing the data in the data storage; In the case where the normal is selected, it is determined whether the output value X of the driver's head position sensor is within the reference range, and when the reference value is out of the reference range, X is stored in the data storage unit, and if Y is greater than the reference value Yref, Y is large. Means for storing Z in the data storage, and if Z is larger than the reference value Zref to store Z in the data storage, In case of emergency, W is calculated by multiplying X ', Y, Z values stored in the data storage unit, and in case of normal, W is calculated by multiplying X, Y, Z values stored in the data storage unit, and W is predetermined. And a means for judging whether the reference value is larger than the reference value Wref, and outputting a warning signal if the warning value is greater, to cause the warning unit to perform a warning action. A data collecting unit for collecting the output value X from the sensor for detecting the position of the driver's head, the output value Y from the sensor for measuring the driving mode of the vehicle, and the output value Z from the sensor for detecting the speed of the vehicle; A data storage unit for storing collected data and processed data; Including a data processing unit for performing a predetermined process, The data processing unit, Means for determining whether the X falls within a reference range and storing the X in the data storage unit when the X falls outside the reference range; Means for determining whether Y is greater than a reference value Yref and storing Y in the data storage if large; Means for judging whether Z is greater than a reference value Zref and for storing Z if it is larger; Means for multiplying the X, Y, and Z values stored in the data storage unit to calculate W, determining whether W is greater than a predetermined reference value Wref, and outputting a warning signal if greater than the predetermined reference value Wref. Drowsy driving warning device. A data collecting unit for collecting the output value X from the sensor for detecting the position of the driver's head, the output value Y from the sensor for measuring the driving mode of the vehicle, and the output value Z from the sensor for detecting the speed of the vehicle; A data storage unit for storing collected data and processed data; Including a data processing unit for performing a predetermined process, The data processing unit, Means for receiving a warning level signal including an 'emergency' and a 'normal' state input by the user's selection to determine whether the warning level is 'emergency' or 'normal'; Means for setting and storing X 'having a value unrelated to the driver's head position when the warning level signal is an emergency, storing the Y in a data storage, and storing the Z in a data storage; If the warning level signal is normal, it is determined whether X is within the reference range, and if X is out of the reference range, X is stored in the data storage, and if Y is greater than the reference value Yref, if Y is large, Means for storing and determining whether Z is greater than the reference value Zref and storing Z in the data storage if large; In case of emergency, W is calculated by multiplying X ', Y, Z values stored in the data storage unit, and in case of normal, W is calculated by multiplying X, Y, Z values stored in the data storage unit, and W is predetermined. And a means for judging whether the reference value is greater than the reference value Wref, and outputting a warning signal if it is large. The method according to any one of claims 1 to 4, In determining whether the output value X falls within the reference range, the reference range is a range having a value indicating that the head position of the driver is in a normal position, The Yref, Zref is drowsy driving warning device corresponding to the type and speed of the vehicle, characterized in that '0'. The method according to any one of claims 1 to 4, wherein the driver's head position sensor is an infrared ray distance sensor which is installed on the left center right of the head protector of the car and detects the relative distance of the driver's head moving back, front, left, and right from the head protector. Drowsiness driving warning device corresponding to the vehicle driving mode and speed, characterized in that. According to any one of claims 1 to 4, wherein the vehicle driving type sensor is a three-axis acceleration sensor which is installed in the vehicle to measure the instantaneous speed change in the x, y, z-axis direction of the vehicle, characterized in that , Drowsy driving warning device corresponding to driving mode and speed. 5. The drowsiness driving warning device according to claim 1, wherein the vehicle speed sensor outputs a number of pulses corresponding to the speed of the vehicle. 6. Collecting the output value X of the sensor for detecting the position of the driver's head, the output value Y of the sensor for measuring the driving mode of the vehicle, and the output value Z of the sensor for detecting the speed of the vehicle, Determining whether the X is within a reference range, and storing the X value when the X is out of the reference range, Judging whether Y is greater than a reference value Yref, and if Y is large, storing the Y value in a data storage unit; Judging whether the Z is greater than the reference value Zref, and if the Z is large, storing the Z value in the data storage unit; Calculating the W by multiplying the stored X, Y, and Z values, and determining whether W is greater than a predetermined reference value Wref, and outputting a warning signal if it is large, the drowsiness driving warning method corresponding to the vehicle driving type and speed . Collecting the output value X of the sensor for detecting the position of the driver's head, the output value Y of the sensor for measuring the driving mode of the vehicle, and the output value Z of the sensor for detecting the speed of the vehicle, Determining whether the warning level signal is 'emergency' or 'normal' by allowing a user to input a warning level signal including 'emergency' and 'normal' status, If an emergency is selected, replacing X with X ', which is a value that is preset and stored to a predetermined value independent of the driver's head position, storing the Y, and storing the Z; When Normal is selected, it is determined whether X is within the reference range, and if X is out of the reference range, X is stored, and if Y is greater than the reference value Yref, Y is stored, and if Z is greater than the reference value Zref, Saving Z if large, In the case of emergency, multiply the stored X ', Y, Z values to calculate W, and in the normal case, multiply the stored X, Y, Z values to calculate W, and determine whether W is greater than a predetermined reference value Wref, A drowsy driving warning method corresponding to a vehicle driving type and speed, the method comprising: outputting a warning signal if large. 11. The method according to claim 9 or 10, In determining whether the output value X falls within the reference range, the reference range is a range having a value indicating that the head position of the driver is in a normal position, The Yref, Zref is drowsy driving warning method corresponding to the vehicle driving type and speed, characterized in that '0'. The driver's head position sensor according to claim 9 or 10, wherein the driver's head position sensor is an infrared ray distance sensor which is installed at the left center right of the head protector of the vehicle and detects the relative distance of the driver's head moving back, front, left, and right from the head protector. Drowsy driving warning method corresponding to the vehicle driving mode and speed. The vehicle driving method according to claim 9 or 10, wherein the vehicle driving mode measuring sensor is a three-axis acceleration sensor installed in the vehicle and measuring an instantaneous speed change in the x, y and z axis directions of the vehicle. Drowsy driving warning method corresponding to shape and speed. The drowsiness driving warning method according to claim 9 or 10, wherein the vehicle speed sensor outputs a number of pulses corresponding to the speed of the vehicle.

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