Fatigue driving alarm device and alarm method

Abstract

The invention discloses a fatigue driving alarm device and alarm method, and belongs to the field of automobile driving alarm. The alarm device comprises a left skin resistance collection module, a left skin temperature collection module, a right skin resistance collection module, a right skin temperature collection module, a left skin resistance constant current source, a left skin temperature constant current source, a right skin resistance constant current source, a right skin temperature constant source, a left skin resistance sampling circuit, a left skin temperature sampling circuit, a right skin resistance sampling circuit, a right skin temperature sampling circuit, a single-chip microcomputer, an alarm module, and a power supply. The device collects the skin resistance and skin temperature signals of the left and right hands, holding a steering wheel, of a driver, converts the skin resistance and skin temperature signals into voltage signals, carries out the averaged statistics of the skin resistance and skin temperature signals in a preset time period, judges the fatigue features of the driver according to the change conditions of statistical values, starts the alarm module, solves problems that a conventional fatigue driving alarm device is not stable and accurate, is strong in anti-interference capability, is accurate in collected data, is accurate in judgment of fatigue features, and is wide in application range.

Description

technical field [0001] The invention belongs to the field of automobile driving alarms, and in particular relates to an alarm device and an alarm method for timely alarming a driver when a fatigue driving state occurs during driving. Background technique [0002] Fatigue driving has always been the road killer of human beings. According to related surveys, traffic accidents caused by fatigue driving in Hyundai accounted for 20% of all traffic accidents, and accounted for 40% of serious traffic accidents. These traffic accidents led to A large number of property losses and casualties, so how to monitor the driver's fatigue during driving, and provide timely and effective reminders and early warnings, has become an important topic to reduce the incidence of modern traffic accidents. [0003] At present, there are mainly research and development in the following aspects on this issue: [0004] 1. In terms of human physiological characteristics: mainly to study the abnormal cha...

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Problems solved by technology

[0004] 1. In terms of human physiological characteristics: mainly to study the abnormal changes of brain waves, biodermal electricity and pulse. For example, an operation instruction system disclosed in the invention patent of my country Patent No. 200610005069.9, which uses detection components to detect the physiological condition of the operator , and then compare the detected physiological condition value with the stored reference value in the fatigue degree judging part, so as to judge the operator’s fatigue degree. The disadvantage of this method is that the difference in environment and human personality has a great Large, it is easy to generate fatigue interference signals, resulting in inaccurate judgment results, and often false alarms

[0005] 2. In terms of the characteristics of human skin changes: it is mainly to study the abnormal changes of human skin, such as the fatigue driving detection technology disclosed in the invention patent of my country Patent No. 200610007961.0. In order to determine whether the driver is dozing off, the disadvantage of this method is that it is easy to generate false alarms and the alarm is not timely, because the driver does not only bend his head downward when he is dozing off, but when driving When the driver wants to relax and twists his head, it is easy to generate false alarms, and it may be too late to call the police when the driver is dozing off to the point that the head has been bent, and cannot play the role of timely alarm.

[0006] 3. Automobile running characteristics: mainly to study abnormal changes in automobile operation, such as a warning device for fatigue driving motor vehicles disclosed in my country's patent No. 200610124441.8. S" type to judge whether the driver is in a fatigue driving state, but this method is prone to false alarms when the road surface itself is "S" type, and in the case of narrow roads, the alarm may not be timely.

[0007] 4. In terms of driving time characteristics: it is mainly to record the driving time to see if it is overtime. For example, a kind of automobile information test control device announced in the invention patent of my country Patent No. 200420097002.9 has a continuous driving time timing function. When the continuous driving time exceeds the preset The alarm is given at the time, but this method is obviously too mechanical, because the driving time exceeds the specified time does not necessarily mean that the driver is tired, so it is easy to cause false alarms, and this method is obviously not suitable for long-distance driving. Sex is not strong

[0008] 5. Driving habits and characteristics of human bio-skin electrical changes: mainly to study the changes of human bio-skin resistance between the two electrodes on the steering wheel that match the hands of the driver, such as the one published in China's patent number 200710050128.9 Automobile fatigue driving alarm method, which uses a timer to give an overtime alarm to both hands holding the steering wheel. However, this method is only effective for drivers who hold the steering wheel with both hands, and is not effective for drivers who are accustomed to driving with one hand. Because the driving time of holding the steering wheel with both hands varies with the driver's habits, the alarm time for timer overtime is not valid. It’s good to be sure; the counter will alarm the skin resistance rise between the two electrodes on the steering wheel with both hands and exceed the limit, and it will not work for drivers who sweat less or more. When the weather is cold and the palms are dry, the contact resistance will drop slowly after the hands are in contact with the electrodes. , the change of the human body's biological skin electricity is covered, when the weather is hot, the palms are sweaty, and the warm sweat will submerge the mental sweat, the counter will not get the change of the human body's biological skin electricity; since this method only has a constant current source current , for large changes in the skin resistance of the human body in different environments, the current cannot be automatically adjusted, resulting in low resolution of the skin resistance, or even indistinguishable

Summarizing the above three methods, the first method is greatly affected by the environment and personality differences, which is prone to interference and affects the accuracy and practicability of monitoring. The second method is greatly affected by the driver's personality differences and subjective will, and is too mechanical. It is prone to wrong fatigue diagnosis and other problems. The third method is a more practical method at present, but it cannot completely solve the problems existing in the first and second methods.

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