A few days ago, Audi achieved the world’s first L4 autonomous driving demonstration integrating V2X signals on public roads. Functions based on V2X include: sensing pedestrians and vehicles outside the driver’s line of sight and automatically slowing down, and automatically changing lanes for emergency vehicles. Lane yielding, dynamic V2I traffic light functions, etc. are another step forward for the future of autonomous driving.
Starting from the Audi A7L and Audi A6L, some Audi models may be equipped with 5G communication modules and add three new V2X functions in the future. The author summarizes the multiple scene functions of V2X as follows:
1. Through V2P signals, after the vehicle stops, it can remind the driver to pay attention to the non-motorized vehicles behind it to avoid door collisions between the vehicle and the non-motorized vehicles behind it. In addition, the mobile phones of pedestrians crossing the road are equipped with V2P communication units as sensing inputs, and the vehicles will receive the V2P signals sent by their mobile devices to avoid accidents caused by pedestrians crossing the road
2. With the help of V2V technology, two vehicles Cars share driving information with each other. When crossing roads, the two vehicles can collaborate to find the best solution while minimizing impact on main road traffic. In the event of an emergency vehicle (ambulance, etc.), it can transmit its own information to nearby vehicles. The HAD function can recognize that an emergency vehicle is approaching from behind and take action to give way as soon as possible. If the vehicle is leaving the autonomous driving zone, through V2N technology, the vehicle can receive map information and remind the driver to take over the vehicle in time.
3. This series of functions integrates the traffic light information received by V2X technology with ADAS. The vehicle can react automatically. When the green light turns on, the vehicle will automatically start to pass. When driving on multiple When on the road, the vehicle predicts the passing time and automatically selects the fastest lane. If road construction is detected, vehicles equipped with V2X OBU can receive messages from the roadside unit, improving the driving safety of vehicles when passing through the construction area
4. Through V2I technology, the roadside unit can The dedicated lane warning signal is transmitted to vehicles along the way, making up for the limitation that the vehicle's own sensor cannot effectively detect dedicated lane information. The roadside unit can detect pedestrian movement and then transmit the warning signal to surrounding vehicles. Roadside units can obtain the prohibited traffic information before the vehicle enters the prohibited road or earlier, and then transmit the signal to the vehicles along the way. Through V2I signals, drivers can learn in advance that there are objects thrown ahead and take timely measures.
5. With the V2I+HAD function, the vehicle can obtain speed limit information from the roadside unit earlier. As the input signal of HAD, the vehicle will automatically decelerate to within the speed limit range. We will describe it in detail below. Some functions.
This time, Audi demonstrated its patented V2I and V2P (vehicle-to-pedestrian communication) technology. The vehicle can sense the sudden behavior of pedestrians crossing the road and automatically slow down to avoid hitting pedestrians. These two technologies will complement the limitations of onboard sensors in sensing other road users, demonstrating the added value of V2X.
This technology is expected to greatly avoid or alleviate traffic accidents between vehicles and pedestrians. Another Audi V2P patented technology can issue an early warning to the driver of non-motorized vehicles approaching the vehicle. This will effectively prevent drivers from accidentally opening the door without paying attention to their surroundings, causing serious injuries to cyclists.
Audi will also demonstrate other V2I-based technologies, including: roadside unit-based no-go zone warnings, allowing drivers to take early action and change routes to help alleviate traffic congestion; and roadside unit-based The thrown object warning reminds the driver to pay attention to the thrown objects on the road so as to avoid them in advance. These use cases illustrate how V2I ??technology can reduce accidents by providing traffic and safety information to vehicles in real time.
Audi will soon launch the Audi A7L and Audi A6L equipped with 5G modules and C-V2X functions to the Chinese market, and will promote related hardware and functions to more mass-produced models in the future. Among them, the three newly introduced V2X functions include: Audi Traffic Light Information (TLI), Audi Local Hazard Information (LHI), and Local Hazard Warning (LHW) function .
The Audi traffic light information system, with the support of local infrastructure, will provide "Green Light Optimized Speed ??Advisory (GLOSA)" and "Time-to-Green" ) two service functions. In addition to providing users with a smooth driving experience, these two functions can also save energy consumption by reducing the number of decelerations or accelerations. Multiple research results show that cars will drive more efficiently after accessing traffic light information.
The "Green Light Optimization Speed ??Recommendation" can calculate the ideal speed for drivers to achieve a smooth green light experience throughout the journey. In the application case, this function will advise the driver to adjust the appropriate speed so that the vehicle can pass smoothly under the conditions of green lights throughout the journey, thereby avoiding unnecessary acceleration and deceleration and achieving more efficient and safer driving. When the vehicle is about 250 meters away from the intersection, the "Green Light Optimized Speed ??Recommendation" will also remind the driver to adjust the speed appropriately so that the vehicle and the coming vehicles behind can successfully pass the signal lights on the road, effectively reducing unnecessary extra traffic caused by stopping and going. energy consumption. If you encounter an unavoidable red light, the "Green Light Countdown" function will automatically count down the time until the next green light.
Audi Hazard Information (LHI) and Hazard Information Warning (LHW) systems use on-board sensors to monitor hazardous conditions, such as low visibility, accidents, slippery roads, broken down vehicles, emergency braking and emergency braking of the vehicle ahead. Vehicles etc. Sensors can perform real-time network connection and early warning communication between related vehicles through V2N (vehicle-to-cloud interconnection) and V2V (vehicle-to-vehicle direct connection). Prompt messages will pop up on the vehicle's human-computer interaction interface and virtual cockpit screen to remind the driver to pay attention to road conditions outside the line of sight and take measures in advance.
Based on TLI information and combined with existing driver assistance functions, Audi will introduce a more intelligent traffic light control function (Traffic Light Control, TLC) into mass-produced models in the future. This function will be based on the received Traffic light information, current vehicle speed, intersection distance and other information can control the vehicle to pass the intersection at a reasonable speed, or stop at the appropriate location when the light is red, helping customers to cope with urban driving scenes more calmly.
Summary: Michael Hofmann, executive vice president of R&D at Audi China, said, “With China’s continuous investment in the development of smart cities, China has become the world’s top autonomous driving technology innovation center. "At the same time, Audi has become the first domestic high-end car brand to equip its mass-produced models with 5G communication modules, setting a new industry benchmark. Among them, Audi A7L and Audi A6L will be the first to implement this feature. In addition, both models will also be equipped with new C-V2X functions, including: Audi Traffic Light Information (TLI), Audi Local Hazard Information (LHI), and hazard information warning (Local Hazard Warning, LHW) function.