(This article comes from Titanium Media's independent content brand titanium geek. All black technology that lets you open your mind is here.)
On April 12, Changan Unmanned Vehicle departed from Chongqing Chang'an Academy. The driverless test will be conducted from south to north via Xi'an, Zhengzhou and other cities. It is expected that it will officially arrive in Beijing on April 17 to participate in the Beijing Auto Show.
The total mileage of the “exam in Beijing†exceeded 2,000 kilometers. It is the longest-running unmanned car test for domestic vehicle manufacturers. This record is maintained by Audi on an international scale. Audi completed a 3,500-mile (4,023 km) long-range unmanned project from San Francisco to New York last year.
The real environment is the biggest variable facing autopilot. The number of autopilots in a real environment has become the industry's criterion for judging the autopilot level. Only by adapting to more different traffic environments can the problems be discovered continuously.
The Changan driverless car during the test, the maximum speed will reach 120 km / h, more than most foreign car giants and Google and other Internet companies developed products. You know, Google's modified Lexus driverless car has been on the road for many years, accumulative mileage of more than 1 million miles, the fastest speed is only 40 kilometers / hour.
The entire test will last for five days. Although the entire process will be high-speed, it will not be "smooth". For example, the section from Chongqing to Xi'an will cross the Qinling Mountains, the dividing line between China's north and south, and Qinling has the world's longest and most numerous tunnels. The highway is much more complicated and the various traffic conditions must be overcome on the way.
The basic principle of Changan driverless car is mainly summarized in three aspects:
1. Environmental awareness: Sensing and information technologies such as millimeter-wave radar, ultrasonic radar, camera, V2X (car-to-car information exchange), and high-precision positioning are used instead of human eyes and ears.
2. Intelligent decision-making: Using artificial intelligence technology, on the premise of satisfying driving safety and traffic rules, both the ride comfort and the autonomous intelligent planning driving route.
3, control and implementation: According to the planned path, the car's horizontal and vertical control, control the vehicle driving
Among them, all three vehicles involved in driverless testing have HD front-view cameras installed, but they actually use two technical solutions, which are applied to low-speed and high-speed traffic conditions:
One solution is to cope with the higher cost German SICK LMS511 outdoor laser radar. The working range of the laser radar is 0.7-80 meters and the maximum scanning range is 190 degrees. It is suitable for low-speed road display, mainly for pedestrian detection, low-speed follow-up, etc. ;
Another solution is to use millimeter-wave radar, with image analysis and high-precision maps, the fastest speed can reach 120km / h, suitable for high-speed road conditions, including high-precision maps provided by the high German and other map service providers to provide technical support.
The hardware used in the above two autopilot system solutions, whether it is laser radar or millimeter-wave radar, is a relatively mature product in the market, but it is not an easy task to put this system into the front loading.
Li Wei, head of the Chang'an Automobile Research Institute, told a reporter from Titanium Media that “through a large number of real road tests, the main functions and technologies of autonomous driving will be verified, providing theoretical support and practical experience for the later research and development and adaptation work. Apply the autopilot system to production cars as soon as possible."
According to the goal of planning unmanned driving in Chang'an, it will be divided into four stages: In 2016, Ruiqi and CS75 will be the first to adopt adaptive cruises at 0-120km/h; in 2017, the development of assisted-driving products will be strengthened; Intelligent parking, high-speed automatic driving and other functions are realized; in 2025, automatic driving under all conditions is realized.
Titanium media reporters experienced low-speed unmanned driving in the Chang'an Academy Park, overtaking the lanes, identifying road signs, and following the car at a low speed. The functional feeling was very close to that of Tesla's Autopilot. The other production models still have great technological advancements and are a milestone event for domestic OEMs.
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