AEB System

The Autonomous Emergency Braking (AEB) system is an active safety driving assistance technology. Utilising onboard environmental perception sensors, the system continuously monitors the road ahead. If a potential collision with a pedestrian, cyclist, or stationary obstacle is detected and the driver fails to take timely evasive action, the system automatically intervenes with partial deceleration or full emergency braking to prevent the impact or significantly mitigate collision damage.

Core Technical Architecture and Working Principle

The AEB system primarily comprises forward-sensing environmental sensors (such as millimetre-wave radar, front-facing monocular or binocular cameras, and LiDAR), an Electronic Control Unit (ECU), and hydraulic brake actuators.

Real-Time Dynamic Monitoring and Collision Risk Assessment (Real-Time Monitoring & Collision Risk Assessment):

The system's millimetre-wave radar and optical cameras calculate the relative distance, relative speed, and Time to Collision (TTC) with the vehicle ahead in real time at high frequencies. The ECU continuously evaluates these parameters via built-in safety algorithms. Once a predicted collision risk breaches predefined safety thresholds, the system initiates a sequential multi-stage warning protocol (such as instrument cluster visual alerts, audible buzzers, or seatbelt pre-tensioning). 

Multi-Stage Automated Braking Intervention (Multi-Stage Automated Braking Intervention):

If the driver fails to respond following the warnings or applies inadequate brake pedal pressure, the AEB system intervenes directly. It first pre-fills the braking system to eliminate pad-to-disc clearance, subsequently applying staged active hydraulic pressure to the brake lines for partial deceleration or maximum emergency braking, bleeding off as much speed as possible prior to any potential impact. 

Safety Specifications and Physical Limitations

Strictly Prohibiting Misuse as an Absolute Collision Barrier or Driver Replacement (Prohibiting Misuse as Absolute Collision Prevention):

AEB serves as a secondary safety backup strictly designed for emergency interventions. Due to inherent hardware and sensor constraints, the system may suffer detection delays or blind spots under poor visibility conditions—such as unlit roads at night, severe glare, torrential downpours, dense fog, or heavy snow—or when encountering crossing non-motorised transport, highly reflective surfaces, and irregularly shaped obstacles. Drivers must never deliberately test the system's operational limits or drive distracted under the assumption that AEB provides full automation. 

Sensor Physical Cleanliness and Calibration Maintenance Limitations (Sensor Cleanliness & Calibration Maintenance):

The core sensing hardware of the AEB system is typically integrated into the front radiator grille and the upper section of the front windscreen. Driving with sensor surfaces obscured by heavy mud, ice, snow, insect splatter, or non-compliant dark solar film is strictly prohibited. Furthermore, following a front-end collision, windscreen replacement, or suspension overhaul, the vehicle must not be operated without recalibration via dedicated professional ADAS calibration equipment. Accurate geometric alignment of sensor data is essential to avoid system failure or dangerous phantom braking triggered by detection discrepancies.