L2 or below driving assistance technology makes driving easier, reduces driving and increases safety. Is it really? Let Xiaobian take you to understand and test the lane departure warning system.
What is the lane departure warning system?The lane departure warning system is a system that assists the driver in reducing the car's traffic accident due to lane departures by means of an alarm. The lane departure warning system is composed of an image processing chip, a controller, a sensor, and the like.
The lane departure warning system is mainly composed of a HUD head-up display, a camera, a controller and a sensor. When the lane departure system is turned on, the camera (generally placed on the side of the vehicle body or the rear view mirror position) will collect the identification line of the driving lane at all times, through image processing. Obtain the position parameter of the car in the current lane. When detecting that the car deviates from the lane, the sensor will collect the vehicle data and the operating state of the driver in time, and then the controller will send out an alarm signal, and the whole process is completed in about 0.5 seconds, which is the driver. Provide more reaction time. If the driver turns on the turn signal and normally performs the change of line, the lane departure warning system will not make any prompt.
[Test process] The system will actively "correct"Under the premise of safety, the vehicle is intentionally “running offâ€. The system is the first time to intervene, giving a clear alarm sound and giving the steering wheel a clear reverse torque. The torque in this direction is not large, only enough for the vehicle to slowly return to the original driving route. In this case, the driver "holds firmly" on the steering wheel, and this reverse torque disappears after a slight attempt - the driver's intentions and actions are considered to be the first priority. This reverse torque disappears after the wheel has left the line.
Note that the system is only activated when the vehicle deviates from the driving route, and does not ensure that the vehicle is traveling on an accurate driving route. Leave it alone, let the system control the vehicle, then the vehicle will take a slight "S" line between the two lines. In other words, the system only plays a "correction" function, and there is no "tracking" function.
The system's "correction" is more a reminder to the driver, allowing the driver to quickly return to God, take over the drive, and return the vehicle to the correct route.
The test is divided into two types: urban roads and highways. This is also the scene most commonly seen in daily driving. First test the city roads, the starting point and the end point are Jinan University, through Huangpu Avenue, Dongfeng Road, Jiefang Road, Huanshi Road, Keyun Road, the whole journey is about 30 kilometers. Due to the clear markings on the road, the system is active most of the time.
Highway: quite usefulThe high-speed test was carried out during the early Spring Festival, driving vehicles to and from Guangdong and Fujian, with a journey of more than 2,000 kilometers, including more than 1,800 kilometers of expressways. All the way down, the biggest feeling: wearing the state over the province, long-distance self-driving, lane departure warning is quite useful. Statistics show that the whole process is three times. When the driver is distracted or unaware, the system activates and actively “correctsâ€. When the steering wheel suddenly felt a reverse moment, the driver found that he had already ran a slight deviation without knowing it.
On the highway, the vehicle is slightly off-tracked. When the wheel is pressed to the line, the tire will emit a larger tire noise, and the suspension will have a clear vibration. In the absence of lane departure assistance systems, drivers rely on these “signs†to detect deviations, which requires experience accumulation. With the lane departure assistance system, even a novice can know that the vehicle has been deviated in the first place. This is the benefit of technological advancement.
Test conclusion: Make driving easierTested, on the city road, in the end should not use the lane departure warning: novices recommend activation, "old driver" is available or not. On the highway, it is recommended to activate the system for the whole process.
In recent times, autonomous driving is very popular. Automated driving has to go out of the lab and walk into people's lives. It still takes a long road to go. However, it is not difficult to popularize the basic technology of automatic driving such as lane departure warning, adaptive cruise, and automatic parking, because they can meet the basic requirements for the convenience of transportation at present, and can be used as a safety. The configuration appears.
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