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The things that have to be said between sensors and cars.

source:本站

time:2018-11-05 10:18:30

Sensors are becoming an increasingly important part of automobiles. Recently, a Japanese research team has developed a new type of sensor to capture driver fatigue, thereby reducing the occurrence of fatigue driving accidents. As a collection of many sensors in Google's driverless vehicle, it is the integration of sensors and vehicles.


New car sensor: be careful when you take a nap.


Hiroshima University and Tokyo University have developed a new sensor system that can amplify the weak pulse on the skin surface of the back and detect the heart rate. The system installed in the car seat can catch the warning signs of driver fatigue and nap, and greatly reduce the traffic accidents caused by fatigue driving. In addition, the system can also help the elderly to carry out health management, or help patients keep abreast of heart conditions, so that they can contact doctors quickly in emergencies. The sensor is wrapped in polyester about 2 centimeters thick as a buffer material. Excess high-frequency noise, such as voice and vibration, can be shielded. The microphone in the sensor system can display the information captured by the oscillator as heart sound. Heart sound refers to the sound produced by the vibration caused by the contraction of myocardium, the closure of heart valve and the impact of blood on the wall of ventricle and great artery.


HARKEN: fatigue driving catcher.


The sensor system HARKEN, developed by the European project team, is similar to the new sensor in Japan. It can detect signs of napping by measuring heart rate and respiratory rate. HARKEN is a sensor system built into car seat belts and seat covers, which can detect fatigue or sleepiness even before obvious external expressions such as yawning or bad driving habits occur. Data show that in 2012, 33561 people died in car accidents in the United States, and this figure was 28100 in the European Union. By 2020, driving accidents may be the third most common causes of death or disability. According to the iMobility forum, fatigue driving accounts for about 8.3% of vehicle accidents. In some places, it has even risen to 20%-35%, which accounts for serious traffic accidents. The emergence of HARKEN may prompt the emergence of a driving warning system to help reduce the annual number of traffic accident deaths.


HARKEN system includes a car seat-case sensor, a seat belt and a signal processing unit to process sensor data in real time. Such a system can also filter out background noise such as vehicle vibration and other body movements of drivers, so that it can focus on detecting heart rate and breathing rate. When people enter a state of fatigue or drowsiness, their breathing and heart rate begin to change. HARKEN can monitor these changes and warn the drivers before signs appear. European researchers hope that the HARKEN project will focus on a short-term time frame for listing so that street tests can be conducted under actual traffic conditions, because any technology that improves alertness to drowsy drivers may still have a long way to go to save lives.


Google unmanned vehicle: sensor maker


And when it comes to sensors and cars, we have to mention Google's driverless car, which can be called "the aggregator of automotive sensors". It integrates cars and sensors. Through the integration of data from these sensor systems, Google has developed an automatic car that can drive millions of miles. The hardware system of Google's unmanned car is mostly used, so its function is not limited to the car itself knowing where the road is, but also has the ability to detect obstacles. This system is much more complex than we thought. Google's unmanned vehicle has a range of detection technologies, sonar equipment: radar systems are usually used in conjunction with sonar systems, at least on some Google test machines. They have very narrow views, but they can let the car know the direction of the car in other directions. These sensors can be used to provide bending data, start brakes and pre-tighten seat belts.


HD camera: there are multiple cameras in the car, allowing the system to get the most comprehensive view. It allows the system to detect the real-time location of other vehicles.


Laser: Laser technology plays a very important role in this system. Although there are many sensors to detect distance, it is far less accurate than laser technology. The Velodyne 64-beam laser system is used in the UAV system, which can measure the distance by 360 degrees rotation, and greatly improves the accuracy of detection.


Radar: The LIDAR system can display the precise positioning of the car. The difference between LIDAR and geographic positioning is that it provides the location of the car in a specific environment. The driverless car also needs to measure the speed of the vehicle, so Google installed radar around the front and rear of the car.


At present, automobile manufacturers have begun to use sensors to detect fatigue driving, which will help enhance driving safety. As automobiles become more and more intelligent, sensors will play an important role. Google driverless car is the combination of many sensors. Sensors are the key to promote the revolution in the automotive industry.

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