Advanced Driver Assistance Systems

Advanced Driver Assistance Systems (ADAS) is the cornerstone of modern automotive active safety technology. By utilising various on-board sensors (such as cameras and radar) to monitor the surrounding environment in real time, it assists drivers in operating vehicles more safely and effortlessly.

Put simply, ADAS acts like an ever-vigilant "co-pilot". Its core mission is to assist rather than replace the human driver, aiming to mitigate human error and reduce traffic accidents through early warnings and active intervention.

🧠 How the System Works: Perception - Decision - Execution

ADAS is a sophisticated electronic system that operates on a closed-loop logic of "Perception - Decision - Execution".

Perception Layer: The system uses sensor fusion technology to aggregate and process data from multiple sensors, constructing an accurate model of the vehicle's surroundings. These sensors include:
- Cameras: Used to detect lane markings, traffic signs, and traffic lights, as well as classify pedestrians and vehicles.
- Radar (Millimetre-Wave Radar) : Excels at accurately measuring the distance and speed of objects ahead, especially in adverse conditions such as rain, fog, and nighttime.
- LiDAR : Generates high-precision 3D point cloud maps to accurately map the contours and positions of obstacles over long ranges.
- Ultrasonic Sensors: Primarily responsible for close-range detection, serving as the core component for low-speed functions such as automated parking.
Decision Layer: A high-performance computing platform (domain controller) receives and fuses sensor data, running complex algorithms to assess the driving environment and determine the appropriate actions.
Execution Layer: Acting on commands from the decision layer, it controls the vehicle's steering, powertrain, and braking systems to execute specific driving actions.

📜 Key Functions and Classification

ADAS encompasses a comprehensive suite of features ranging from warnings to active intervention, commonly including Autonomous Emergency Braking (AEB), Adaptive Cruise Control (ACC), Lane Keeping Assist (LKA), and Blind Spot Detection (BSD).

According to the SAE International classification standards, mature mass-produced ADAS technologies on the market currently span Level 1 (Driver Assistance) and Level 2 (Partial Driving Automation) .

Level	Definition	Typical Functions
Level 1	Under specific conditions, the system continuously assists the driver with either lateral (steering) or longitudinal (acceleration/braking) control. The driver must perform all other driving tasks and maintain continuous monitoring throughout.	Adaptive Cruise Control (ACC) Lane Centring (LC)
Level 2	The system simultaneously assists the driver with both lateral and longitudinal control, but the driver must actively monitor road conditions at all times and be ready to take over immediately.	Navigation on Autopilot (NOA) Traffic Jam Assist (TJA)

Today, Level 2 systems have become mainstream in the market. However, even with Level 2 systems, the driver remains solely responsible for vehicle control and must stay fully attentive to road conditions at all times. Higher-tier systems such as Level 3 (Conditional Driving Automation) and Level 4 (High Driving Automation) have begun commercial trials in specific areas or operational domains, but are yet to see widespread adoption.