At the end of last year, Nissan Motor released its "Vision 2030" for the era of electrification, planning to invest 2 trillion yen in the next five years to accelerate the promotion of electrification product layout and technological innovation. At the same time, Nissan motor vehicles will also provide more consumers with advanced assisted driving and intelligent technology, and plans to install next-generation lidar systems on all new models by fiscal year 2030.
On April 25, Nissan Motor Company announced its progress in the development of new driver assistance technologies. Nissan Will adopt a multi-sensor fusion solution including lidar, millimeter-wave radar, ultrasonic sensors, and cameras to achieve a high-precision level of autonomous driving. At the same time, Nissan Believes that in autonomous driving technology, the vehicle can achieve emergency avoidance in a variety of complex road conditions is the top priority, which will greatly improve the safety performance of the vehicle.
Nissan's "Road Reality Perception" technology combines information perceived by next-generation high-performance lidar, radar, and cameras to detect the shape and distance of targets in real time and the spatial structure of the area around the vehicle. Using this information, the vehicle can analyze the current situation in an instant to make a judgment and automatically perform collision avoidance operations. At the same time, the technology can also detect deceleration traffic and road obstacles in the distance, and automatically change lanes. Importantly, in the absence of detailed map information, the technology can still provide drivers with strong driver assistance support.
The solution of multi-sensor fusion is an autonomous driving solution that most car companies except Tesla are more favored. On Nissan's test vehicle, we were able to see that such road perception system hardware consisted of "1 lidar + 10 cameras + 7 radars". Among them, the position of the lidar is located on the roof of the car, which can maximize its role in long-distance detection. The combination of camera and ultrasonic radar can play to its advantage at close range or low speed.
Regarding the current research and development progress of this road live perception system, Nissan Motor has also made practical demonstrations through some scenarios.
Scenario 1: Emergency avoidance and braking
This scene can be seen that the vehicle in the normal straight process, suddenly encountered a vehicle from the left front blind spot, the test car chose to the right front for emergency avoidance, but then encountered a pedestrian suddenly emerging from the right green belt, when the time came, the vehicle made emergency braking and completely stopped.
Scenario 2: Avoid dynamic objects and brake
In this scenario, the test car normally follows the front car, the front car suddenly changes lanes after the reverse rolling tire, the test car then to the right for emergency avoidance, at this time the right front blind area suddenly appears left turn vehicle, then the vehicle has no time and space to avoid, can only emergency brake.
Scenario 3: Multi-lane accident avoidance
In this scenario, the trailer-mounted motorhome in front of the test vehicle suddenly causes an accident and occupies the lane, blocking the direction of the test vehicle. At this time, the vehicle first judges that the current lane cannot pass normally, and then judges that the passage of the next lane is also blocked, and then judges that the third lane can pass normally and then makes emergency avoidance and passes smoothly.
Scenario 4: Sudden collision avoidance
In this scenario, the vehicle in front of the test vehicle suddenly collides with the vehicle in the next lane at a small angle, and the vehicle in front blocks the current lane traffic, and the test vehicle then judges the traffic situation in the next lane and chooses emergency avoidance to safely pass through the accident area.
Scenario 5: Scattering items to avoid
In this scenario, the test vehicle in the normal driving process, from the opposite road blind area suddenly flew unknown objects, the test vehicle after calculation, choose to avoid the opposite direction at the first time, successfully avoid the "flying disaster".
At present, many domestic car companies have mass-produced and loaded lidar, but the handling logic in the face of emergencies is different. Avoidance or emergency braking, this is the choice of strategy, in a very short reaction time, in a radical or conservative strategy, a different line of code, often result in completely different results. Therefore, even different vehicle products equipped with the same hardware sensors will behave differently in real road conditions, which is the intuitive result of the difference in technical background and technical capabilities between different enterprises.