After the radar upgrade to 77GHz, what changes have been made to Buick's ADAS technology?
In the course of more than a century of development, "security" has become a part of the car that has received more and more attention. BIP (Buick Intelligent Performance system) is the solution provided by Buick brand to consumers in intelligent new technology, including intelligent driving control, smart interconnection and smart security. The general-purpose test track in Guangde was opened for the first time and allowed to visit. Che Yunyun was fortunate to be the first batch of media to participate in this universal BIP smart security experience.
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In the Pan-Asian Vehicle Safety Laboratory, which was completed in 2006-2009, the Guangde test site covered a complete test matrix in the fields of high-speed safety collision, medium-low speed calibration and pedestrian protection, including durability test under full road conditions and winter. Test, summer test and corrosion test.
Years ago, when ESP/ESC driving stability system, TCS traction control system and other functions were the high-end configuration of most brands, Buick had tried to popularize its civilian products. The Buick models represented by the new generation of LaCrosse, Angkor and Weilang families combine ACC adaptive cruise, PD pedestrian recognition/protection, HBA intelligent high beam control, LKA lane keeping, SBZA side blind zone warning, and FDI. Car distance warning, FCA front collision warning, CMB collision mitigation, APA automatic parking and many other ADAS technologies.
Compared to the ADAS technology in the previous generation, the biggest upgrade is the addition of vehicle control to more functions. Take the LKA lane as an example. In the previous generation, it was the lane departure warning. When the speed reaches 80km or more, the LKA can be started. The front camera is used to monitor the lane line. Even if there is a curve in front, the vehicle will correct the direction while displaying the warning, so that the vehicle can keep driving in the lane.
The ACC adaptive cruise has a working speed of 25km, and the radar used has been upgraded to a 77Ghz millimeter wave radar. Compared with the traditional 24Ghz traditional radar, the recognition rate is three times the original, and the accuracy of the speed measurement and ranging is increased by three to five times, so that the distance from the preceding vehicle can be monitored more accurately and quickly. Acceleration, deceleration, braking and starting with the speed of the preceding vehicle. And because of the characteristics of radar waves, and is not affected by fog, smoke, dust, and is not afraid of bad weather.
When a vehicle suddenly enters the queue, the vehicle will quickly brake to maintain the preset distance, but the deceleration is relatively flat, and there is no unexpected abruptness caused by computer control. Moreover, the distance from the preceding vehicle provides distance adjustments of three distances: far, medium and near.
The system will fuse the data detected by different sensors such as millimeter wave radar, camera, ultrasonic, etc., and then calculate and analyze to make instructions to control the movement of the vehicle, such as braking, accelerating, controlling the steering wheel and so on. The newly designed electrical architecture includes an 8-way bus and 27 ECU electronic control units, which enhance the computational efficiency of big data interaction processing and support data fusion of megapixel front camera and new generation long-range radar.
ACC adaptive cruise and LKA lanes keep in line with each other, and semi-automatic driving can be formed on the high-speed road section. In the case of uncomplicated road conditions, our hands and feet can be completely liberated, and the car cloud can even take a section during the test. Small video. However, the current shortcoming is that the road markings that LKA relies on, if missing, occluded or otherwise undetectable by the camera, the lane assist system cannot correct the direction, and the system issues a warning to inform the driver to take over the steering wheel. If you follow the route with the preceding vehicle trajectory later, it is more helpful to believe that the road markings are not clear.
In addition, the FDI front vehicle distance warning, FCA collision warning and CMB collision mitigation constitute a collision warning mitigation system. When the speed of the vehicle reaches 10km, the FDI front distance indicates that the distance from the preceding vehicle can be detected by the long-distance radar and the front camera in front of the vehicle. When the vehicle speed is greater than 40km, the time distance from the preceding vehicle is displayed on the meter ( 0.5s-3s).
The FCA collision warning can comprehensively evaluate the collision danger degree of the vehicle running slowly or at rest, and display the orange alarm icon through the instrument when necessary, and alarm the driver with the audible alarm or seat vibration so that they can take active avoidance action. To improve the protection of drivers and passengers.
CMB collision mitigation can monitor the target vehicle in the lane in real time. Through the test screen of the sensor, the vehicle cloud detection system will distinguish the object and the person in front of the vehicle from the side, when there is a high risk of collision (expected collision time) Less than about 2 seconds), the system will first issue a collision alarm. If the driver does not take any measures and the estimated collision time is less than about 0.5 seconds, the system will automatically brake to avoid collision or mitigate the damage caused by the collision.
On the whole, thanks to the upgrade of radar and electronic architecture, this security system has been extended in detecting distance, processing efficiency, recognition speed and identifiable objects. It has also been based on early warning and transitioned to early warning + auxiliary. control. However, due to hardware upgrades, these features cannot be updated simply by software upgrades, but only through the replacement of models.
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