Talking about L2 and L2+ every day, let’s understand what automatic driving assistance is in this article

Driving assistance systems have developed very rapidly in recent years. Many new pickup trucks are equipped with L2 or even L2.9 level driving assistance systems. So what is an automatic driving assistance system? This article will help you understand.

How to classify autonomous driving assistance levels

The classification of automatic driving assistance is currently mainly based on the standards of SAE (SAE International, Society of Automotive Engineers), which is roughly divided into 6 levels from L0 to L5.

L0 manual driving: There is no driving assistance and the driver needs to control the vehicle throughout the process.

L1 driving assistance: The vehicle controls one operation of the steering wheel and vehicle speed, and the driver is still responsible for other operations. Common ones such as cruise control belong to L1 level driving assistance.

L2 partial autonomous driving: The vehicle provides driving for multiple operations on the steering wheel and acceleration and deceleration, and the driver is responsible for the rest of the driving actions. L2 is also a relatively common type of driving assistance currently and will be explained in detail below.

L3 conditional autonomous driving: The vehicle completes most of the driving operations and the driver needs to stay focused in case of emergency. In fact, many models can already achieve L3 level of automatic driving assistance, but due to Chinese regulations, L3 level is not currently allowed to be put on the market.

L4 highly automated driving: All driving operations are completed by the vehicle, and the driver does not need to pay attention, but road and environmental conditions are limited. In Beijing, where the author lives, we often see some autonomous driving test sections. The driver can even sit in the co-pilot and drive. This is the L4 level of highly automated driving, but it is limited to some test sections and the vehicle has been significantly modified. .

L5 fully autonomous driving: The vehicle completes all driving operations and the driver does not need to pay attention.

What are the key configurations of L2 level autonomous driving assistance?

ACC adaptive cruise: Adaptive cruise can be said to be an upgraded version of fixed-speed cruise. Compared with fixed-speed cruise, which can only be limited to a specific speed, adaptive cruise can automatically adjust the vehicle speed according to the road conditions ahead to achieve the purpose of freeing your feet. . It is very convenient during high-speed and long-distance self-driving. Even some highly intelligent pickup trucks can use adaptive cruise in traffic jams.

Lane Keeping: Compared with lane departure warning, the lane keeping assist system works more directly - when the vehicle accidentally deviates from the lane, this system will automatically take over the steering wheel and try to pull the vehicle back to the original lane. For newbies, lane keeping is very practical. However, lane keeping is still a relatively large test for the manufacturer's adjustment skills. When the author turned on lane keeping while driving a domestic new energy car, I could clearly feel "steering wheel grabbing", which caused some trouble when driving. But there is no such feeling when driving a joint venture fuel SUV. Instead, the vehicle body will only correct when the vehicle obviously deviates from the lane.

Active braking: In automatic driving assistance, active braking is an essential configuration. Through sensors, active braking can brake urgently when the driver cannot take action in time to avoid accidents such as rear-end collisions. However, it should be noted that not all active braking can achieve a complete stop. Some active braking still requires the driver to intervene at critical moments.

Blind spot monitoring: Blind spot monitoring uses radar or cameras to monitor the blind spots on both sides and rear of the vehicle. When other vehicles or obstacles enter the blind spot, the system will alert the driver or take corrective measures, such as alerting the driver through sound or vibration. This helps reduce potential collision risks due to blind spots.

Driver monitoring system: Fatigue monitoring is an onboard sensor and control system that monitors driver behavior and conditions in real time. When the driver is fatigued, distracted or has other unsafe driving behaviors, the DMS will alert the driver or take corrective measures, such as reminding the driver through sound or vibration. This helps ensure drivers remain alert and operate safely during autonomous driving.

In addition to the above, there are also road sign recognition, forward collision warning, automatic lane changing, automatic parking, etc., which are also part of the L2 level automatic driving assistance system. At present,   mainstream domestic pickup trucks such as Great Wall Cannon ( parameters | inquiry ) and Jiangling Avenue can achieve L2 or even L2+ and L2.5 level automatic driving assistance, bringing great driving convenience to drivers.

Write at the end:

Although the current automatic driving assistance system is developing rapidly, both L2+ and L2.5 still belong to the category of L2, that is, partial automatic driving. Even if automatic driving assistance is turned on, the driver needs to concentrate at all times and be ready to take over vehicle control at any time. We look forward to the early arrival of truly self-driving pickup trucks equipped with L3 and even L4 and 5 levels in the future, which will be another technological revolution that will improve the productivity of all mankind.