KR20050015771A - System for preventing drowsiness driving and method for the same - Google Patents

Abstract

PURPOSE: An anti-drowsy driving system and a method thereof are provided to stably apply the brake for an emergency condition by memorizing habits of drivers in an ECU(Electronic Control Unit). CONSTITUTION: An anti-drowsy driving system is composed of a digital camera(11) installed at a vehicle to detect changes of external environment and a lane; a deceleration sensor(12) mounted at the vehicle to detect the reduction ratio of the vehicle; a speech recognition sensor(13) disposed at the vehicle to map relation between a high-frequency speech band of a driver and deceleration; a brake unit(14) arranged at the vehicle and mounted with a pedal simulator for separating pedal information of the driver and brake operating hydraulic pressure; an ECU(20) installed at the vehicle to map synthetically an emergency state of the vehicle with information received from various sensors and the digital camera and deceleration information and to increase deceleration ratio by improving brake efforts through the brake unit regardless of pedal efforts; and a warning unit(15) for alarming the driver of drowsy driving judged by the ECU.

Description

Drowsy driving prevention system and its method {SYSTEM FOR PREVENTING DROWSINESS DRIVING AND METHOD FOR THE SAME}

The present invention relates to a drowsiness driving prevention system and a method thereof, and more particularly, to prevent drowsiness driving to improve the braking performance by operating a braking device in advance in case of an emergency by learning a driver's habit to prevent an accident in advance. A system and method thereof are provided.

When the driver brakes suddenly, the vehicle's stability and steering is maintained by using the anti-lock brake system (ABS) or the brake assist system (BAS) to prevent the rear wheels from locking up and losing vehicle stability.

However, the operation of the ABS or BAS is a passive brake system that relies only on pedal effort to recognize the actual emergency braking, so there is no system that can be prevented before an accident.

As a result, inexperienced drivers are often unable to get help using this system.

In addition, safety devices for drivers who are currently sleeping in the vehicle are inadequate, resulting in many accidents due to fire and suffocation.

The present invention was created to solve the above problems, learning the habits of the driver to operate the braking device in advance in case of an emergency situation to improve the braking performance, to prevent accidents in advance drowsiness driving system and its The purpose is to provide a method.

The drowsiness driving prevention system of the present invention for achieving the above object, the digital camera is installed in the vehicle for detecting a change in the external environment, and detecting the degree of change in the outside lane; A deceleration sensor installed in the vehicle to detect a deceleration; A voice recognition sensor installed in the vehicle and mapping a relationship between a high frequency voice band of the driver in the vehicle and a deceleration; A brake device installed in the vehicle and equipped with a pedal simulator for separating the pedal information of the vehicle driver and the brake operating hydraulic pressure; It is installed in the vehicle and comprehensively maps the emergency situation of the vehicle by using the information and deceleration information received from the various sensors of the vehicle and the digital camera, and in case of an emergency, the brake device is braked regardless of pedal effort through the brake device. An ECU for increasing braking power and increasing a deceleration to shorten a braking distance; And a warning device to warn the driver when the ECU determines that it is drowsy driving.

Drowsiness driving prevention method of the present invention for achieving the above object comprises the steps of (a) in the vehicle ECU image processing the external situation of the vehicle, and continuously grasp the driver's voice; (b) determining when an obstacle is found within a certain distance and perceived as an emergency that can no longer be avoided; (c) increasing braking force regardless of the driver's pedal pressure in a vehicle condition for an emergency to obtain a high-speed braking force for an inexperienced driver; (d) The driver's habits are identified by changing the lanes of the vehicle to identify the lane change cycle and the sudden lane change state more than a certain number of times, thereby reducing the vehicle speed in the case of drowsy driving or emergency recognized by the image processing. Alerting; it characterized in that it comprises a.

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

Figure 1 is a block diagram schematically showing the configuration of the drowsiness operation prevention system according to the present invention.

Referring to the drawings, the drowsiness driving prevention system according to the present invention is installed in a vehicle to detect a change in the external environment, the digital camera 11 to detect the degree of change in the external lane and transmit to the ECU to be described later, and the vehicle A deceleration sensor 12 installed to detect the deceleration, a voice recognition sensor 13 installed on the vehicle and mapping a relationship between a high frequency voice band and a deceleration of the driver in the vehicle, and a pedal of the vehicle driver installed in the vehicle And a brake device 14 equipped with a pedal simulator for separating information from brake hydraulic pressure.

In the drowsiness driving prevention system according to the present invention, the emergency situation of the vehicle is comprehensively mapped by using various sensors of the vehicle, information received from the digital camera 11, and deceleration information. The brake device 14 increases the brake effort regardless of the pedal effort, increases the deceleration rate, and shortens the braking distance, and warns the driver when the ECU 20 determines that it is drowsy driving. Apparatus 15 is provided.

In addition, the drowsiness driving prevention system according to the present invention ETACS (Electronic Time & Alarm Control System) (21) which is signaled to induce the driver's sleep in the ECU 20 and to sleep safely, and installed in the vehicle air in the vehicle AQS (Air Quality System) sensor 31 which measures the quality of the driver and prevents the driver from choking during sleep in the ETACS 21, and the electronic accelerator pedal of the vehicle so that a fire does not occur during the driver's sleep. 32) The relay 33 is installed in the vehicle to block the signal in the middle, and the thermostat 34 is installed in the vehicle to control the room temperature of the vehicle.

Drowsiness operation prevention method according to the present invention using the drowsiness operation prevention system according to the present invention configured as described above will be described.

2 is a schematic flowchart showing a method for preventing drowsy driving according to the present invention in sequence.

1,2, the drowsiness driving prevention method according to the present invention, first, the vehicle ECU 20 to image the external situation of the vehicle, and continuously grasp the driver's voice (step 110).

That is, the deceleration sensor 12 recognizes the deceleration of the vehicle at all times, and receives the brake actuation signal, and the relationship between the deceleration during braking, the degree of lane change by image processing, and the voice frequency of the voice recognition sensor 13. To the ECU 20 for mapping.

Subsequently, it is determined if an obstacle is found within a certain distance and recognized as an emergency that can no longer be avoided (step 120).

The brake braking force is increased regardless of the driver's pedal pressure in an emergency vehicle condition so as to obtain a high-speed braking force for an inexperienced driver (step 130).

In addition, the driver's habits are identified by changing the lane of the vehicle to detect a lane change cycle and a sudden lane change state more than a predetermined number of times, thereby reducing the vehicle speed in the case of drowsy driving or an emergency recognized by the image processing and alerting the driver. (Step 140)

That is, when the distance between the obstacle and the voice frequency band due to drowsy driving at about 0.3g or more is mapped and the voice frequency band is exceeded a certain number of times, this is recognized as an emergency braking situation, and the ECU 20 determines the driver's driving style and period of movement. If the outside of the lane is suddenly moved or the lane change is below the average, drowsy driving decreases the speed of the recognized vehicle and alerts the driver by, for example, an alarm sound.

When the driver is still drowsy after the vehicle is completely stopped after the step 140, the driver tilts the seat back to induce sleep according to the memory of the ETACS 21, which is input in advance, and the electronic accelerator pedal 32 after the indoor environment automatic mode. Block the signal of (step 150).

In step 150, if the driver does not want to sleep and raises the seat again, the signal is released.

A detailed description of the step 150 is as follows.

The step 150 is a process of operating the safety mode after grasping the driver's state, and first, sends a signal to the ECU 20 when the driver flips the seat back (step 151).

In addition, the ECU 20 sends a signal to the ETACS 21 to induce the driver's sleep and operate the input memory to safely sleep.

In addition, when the air is contaminated by the AQS sensor 31 in the vehicle, the driver is warned by the ETACS 21 to prevent the driver from choking while sleeping (step 153).

Then, the vehicle indoor temperature is controlled, and the signal of the electronic accelerator pedal 32 is blocked to prevent a fire accident during sleep, thereby preventing engine overheating caused by excessive operation of the electronic accelerator pedal 32 during sleep (step 153).

In the meantime, in step 140, a process of recognizing emergency and drowsy driving using the image processing will be described.

As shown in FIG. 3, first, the boundary of an outside lane is photographed using the digital camera 11 (step 141).

The entire shape photographed in step 141 is converted into a black and white image (step 142).

The lane image is then separated using image processing (step 143). This separation is separated using the overall large curvature in the overall shape.

In addition, the data of the lane area is extracted, the period of change of the lane change and the change size are calculated as the time function of the lane change (lane change rate), and the average value of the size is calculated (step 144).

Next, the distance to the obstacle outside the vehicle is measured to measure a time that can be avoided in proportion to the current speed.

The information is then sent to the ECU 20 (step 146).

That is, information on the average period of lane change, the amount of change in the lane, and the rate of change of the distance to the external obstacle is transmitted to the ECU 20 to provide information about the tiredness of the driver and an emergency situation.

On the other hand, the driver's emergency voice recognition first stores the driver's sound using a microphone when the vehicle is first delivered, and stores the frequency band and tone of the driver's general voice band (step 210).

In operation 220, the sound of the vehicle interior is measured by using a microphone and separated by Hz.

In addition, in order to separate the driver's voice among the various sounds in the vehicle interior, the frequency band and the tone memorized at the beginning of the vehicle are compared.

When it is recognized as an emergency braking item by the voice recognition of the driver, the ECU 20 detects a braking signal, a high frequency of more than the driver voice frequency band is generated, the constant voice frequency band holding time is less than α, and the change rate is β. It is assumed that the above is satisfied.

On the other hand, when the emergency braking situation is not recognized by the driver's voice recognition, when the braking signal is not detected by the ECU 20, when the driver's tone is not tuned, and when the constant voice frequency band holding time is very long For example, if the rate of change of voice frequency is slow, one is used.

As described above, the drowsiness driving prevention system and the method according to the present invention allow the vehicle to learn the emergency situation and the drowsy driving according to the change of the external environment and the driver's reaction, so that the vehicle does not rely only on the pedal pressure when the emergency occurs. Allow deceleration.

In addition, the driver often keeps stepping on the electronic accelerator pedal 32 during sleep or suffocates due to air pollution in the vehicle, thereby protecting the driver from such an emergency.

As described above, the drowsiness driving prevention system and the method according to the present invention have the following effects.

In order to prevent accidents in advance, the driver's habits can be learned and braking performance can be improved by operating the braking device in advance in case of an emergency.

In particular, the vehicle ECU remembers in advance the actions (voice, driving habits) that an inexperienced driver can take when an actual emergency occurs, so that the vehicle can be braked more safely in case of emergency braking. Can be prepared through.

Therefore, it is possible to prevent the accident caused by drowsy driving by learning the driver's habits as well as the pedaling force of the brake braking power, and prevent emergency situations caused by unexpected obstacles as well as drowsy driving.

Although the present invention has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and it will be understood by those skilled in the art that various modifications and equivalent embodiments are possible. Therefore, the true scope of protection of the present invention should be defined only by the appended claims.

1 is a block diagram schematically showing the configuration of the drowsiness operation prevention system according to the present invention.

2 and 3 is a schematic flow chart showing sequentially the drowsiness operation prevention method according to the present invention.

<Description of the symbols for the main parts of the drawings>

11. Digital Camera 12. Deceleration Sensor

13. Voice recognition sensor 14. Brake device

15. Warning device 20. ECU

21.ETASC 31.AQS Sensor

32. Electronic accelerator pedal 33. Relay

34. Thermostat

Claims (10)

A digital camera installed in the vehicle and detecting a change in the external environment and detecting a change in the outside lane; A deceleration sensor installed in the vehicle to detect a deceleration; A voice recognition sensor installed in the vehicle and mapping a relationship between a high frequency voice band of the driver in the vehicle and a deceleration; A brake device installed in the vehicle and equipped with a pedal simulator for separating the pedal information of the vehicle driver and the brake operating hydraulic pressure; It is installed in the vehicle and comprehensively maps the emergency situation of the vehicle by using the information and deceleration information received from the various sensors of the vehicle and the digital camera, and in case of an emergency, the brake device is braked regardless of pedal effort through the brake device. An ECU for increasing braking power and increasing a deceleration to shorten a braking distance; Drowsiness operation prevention system comprising a; warning device to warn the driver when the ECU determines that the drowsiness operation. The method of claim 1, An ETACS that is signaled to induce a driver's sleep in the ECU and to sleep safely; An AQS sensor installed in the vehicle to measure the air quality in the vehicle so that the driver does not choke while sleeping in the ETACS; A relay installed in the vehicle to intercept an electronic accelerator pedal signal of the vehicle so that a fire does not occur during sleep of the driver; The thermostat device installed on the vehicle for controlling the indoor temperature of the vehicle; drowsiness driving prevention system further comprises. (a) image processing the external situation of the vehicle in a vehicle ECU and continuously detecting a driver's voice; (b) determining when an obstacle is found within a certain distance and perceived as an emergency that can no longer be avoided; (c) increasing braking force regardless of the driver's pedal pressure in a vehicle condition for an emergency to obtain a high-speed braking force for an inexperienced driver; (d) The driver's habits are identified by changing the lanes of the vehicle to identify the lane change cycle and the sudden lane change state more than a certain number of times, thereby reducing the vehicle speed in the case of drowsy driving or emergency recognized by the image processing. Drowsy driving prevention method comprising a; step of alerting. The method of claim 3, Recognition of emergency and drowsy driving using the image processing in the step (d), (e) photographing the boundary of the outside lane using a digital camera; (f) converting the entire shape photographed in step (e) into a black and white image; (g) separating the lane image using image processing; (h) extracting data of the lane area, calculating the period of change of the lane change and the magnitude of change as a time function of the lane change (lane change rate), and calculating an average of the magnitudes; (i) measuring a distance that can be avoided in proportion to a current speed by measuring a distance to an obstacle outside the vehicle; (j) transmitting the information to the ECU; drowsiness operation prevention method comprising a. The method of claim 4, wherein In the step (g), the separation of the lane image using image processing, the drowsiness driving prevention method, characterized in that the separation using the overall large curvature in the overall shape. The method of claim 3, The emergency voice recognition of the driver, (k) storing the driver's sound using a microphone to store the frequency band and tone of the driver's general voice band when the vehicle is first delivered; (l) measuring the sound inside the vehicle interior by using the microphone and separating by Hz while driving; and (m) comparing the tones with the frequency band stored at the beginning of the vehicle to separate the voice of the driver among the various sounds in the vehicle interior. The method of claim 3, If it is recognized as emergency braking by the voice recognition of the driver, And detecting a braking signal in the ECU, generating a high frequency above a driver's voice frequency band, maintaining a constant voice frequency band less than α, and a change rate satisfying β or more. The method of claim 3, If it is not recognized as an emergency braking situation by the voice recognition of the driver, When the braking signal is not detected by the ECU, when the driver is not tuned, if the constant voice frequency band holding time is very long, the change rate of the voice frequency is one of the drowsy driving prevention method. The method of claim 3, If the driver is still drowsy after the vehicle is completely stopped after the step (d), the driver's seat is turned back to induce sleep according to the memory of the pre-entered ETACS and the signal of the electronic accelerator pedal after the indoor environment automatic mode Drowsiness driving prevention method characterized in that it further comprises the step of blocking. The method of claim 9, When the driver does not want to sleep again raises the seat, further comprising the step of releasing the signal blocking drowsiness driving prevention method.