Emergency Brake Assist
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Emergency Brake Assist (EBA), also known as AFU in French, is an active safety system designed to help the driver achieve maximum braking force in critical situations. This system continuously analyzes the speed and force with which the driver presses the brake pedal. If it detects a rapid and sudden action, characteristic of panic braking, the EBA interprets that the driver intends to stop immediately. It then instantly and automatically increases the pressure in the brake circuit up to the ABS activation threshold, even if the driver has not pressed the pedal to the floor. The primary objective is to compensate for the human reflex of often failing to brake with sufficient force in an emergency. By guaranteeing optimal deceleration from the very first moments, EBA significantly reduces stopping distances, thereby potentially avoiding a collision or drastically reducing its severity. This system works in perfect synergy with ABS (which prevents wheel lock-up) and ESP (which maintains vehicle trajectory), forming an essential trio for modern active safety.
Benefits
- ✓Significant reduction in braking distance in emergencies.
- ✓Compensation for the human reflex of not applying sufficient pressure to the brake pedal.
- ✓Prevention of collisions, particularly rear-end collisions, by maximizing braking efficiency.
- ✓Seamless and instantaneous activation, requiring no additional action from the driver.
Learn more
Emergency Brake Assist, better known by its acronym EBA (or AFU for Assistance au freinage d'urgence in French), is an active safety feature that has become essential in the modern automotive landscape. Its role is simple yet crucial: to ensure the vehicle deploys its full braking power when an imminent danger situation is detected, even if the driver hesitates. It is an electronic guardian angel that makes up for a well-known human weakness in stressful situations.
How does Emergency Brake Assist work?
The principle of EBA is based on analyzing driver behavior. Electronic sensors continuously measure the speed at which the brake pedal is depressed. In normal driving, the application is progressive. However, when faced with a sudden obstacle, the reflex is to press the pedal very violently and quickly. It is this change in velocity that the system detects.
When it identifies a rapid and forceful press, the onboard computer interprets this as an emergency braking attempt. It then instantly commands a hydraulic pump that applies the maximum possible pressure to the brakes, well beyond what the driver would have applied themselves. This action is maintained as long as the driver keeps their foot on the pedal, until the intervention of the ABS (Anti-lock Braking System), which modulates the pressure to prevent the wheels from locking up and the vehicle from becoming uncontrollable. EBA and ABS therefore work hand in hand to guarantee a stop that is both short and secure.
Not to be confused with Autonomous Emergency Braking (AEB)
It is important to clearly distinguish Emergency Brake Assist (EBA) from Autonomous Emergency Braking (AEB).
- EBA is an assist system: it amplifies the driver's action. The system only triggers if the driver presses the brake pedal.
- AEB is an autonomous system: using radars and/or cameras, it detects a risk of collision and can trigger braking on its own, without any driver intervention.
EBA is an older but fundamental technology, whereas AEB represents a further step toward semi-autonomous driving.
The concrete benefits of EBA
The implementation of this system has had a direct and measurable impact on road safety. Its benefits are manifold:
- Reduction of stopping distances: Studies have shown that EBA can reduce braking distance by up to 45% in certain scenarios. Those few meters gained are often what makes it possible to avoid an impact.
- Compensation for human weaknesses: In panic situations, many drivers are startled and do not press the brake pedal hard enough, or release the pressure too early. EBA corrects this behavior and maintains optimal deceleration.
- Universal efficiency: The system benefits all drivers, regardless of their physical strength or experience, by ensuring that the vehicle's full braking capacity is always accessible.
- Prevention of chain-reaction accidents: By reducing stopping distance, EBA significantly decreases the risk of rear-end collisions, one of the most frequent types of accidents.
Given its proven effectiveness, Emergency Brake Assist has been mandatory on all new cars sold within the European Union since November 1, 2011, alongside ESC (Electronic Stability Control). Consequently, it is no longer a paid option but standard equipment integrated into all vehicles, from economical city cars to luxury sedans. This standardization has greatly contributed to the overall improvement of safety on our roads.
Finitions équipées
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Associated equipment
ESP
ESP, or Electronic Stability Program, is an essential active safety system in modern vehicles, also known as Electronic Stability Control. Its primary role is to keep the vehicle on the trajectory intended by the driver, by preventing loss of grip and skidding. To do this, the ESP uses a series of sensors (wheel speed, steering wheel angle, lateral acceleration, yaw) that continuously analyze the consistency between the direction desired by the driver and the actual behavior of the car. If a discrepancy is detected, signaling the onset of understeer (the front wheels skid) or oversteer (the rear wheels skid), the system intervenes in a fraction of a second. It independently brakes one or more wheels and can also reduce engine power to bring the vehicle back onto the correct trajectory. Mandatory on all new vehicles sold in Europe since 2014, ESP is an electronic guardian angel that significantly increases safety during emergency avoidance maneuvers, in tight corners, or on slippery surfaces (rain, snow, ice). It works in synergy with other aids such as ABS and ASR (traction control).
Autonomous Emergency Braking (AEB)
Autonomous Emergency Braking, commonly known by the acronym AEB, is a fundamental active safety system in modern automotive engineering. Classified among Advanced Driver Assistance Systems (ADAS), its mission is to prevent frontal collisions or, failing that, drastically reduce their severity. To achieve this, it relies on a suite of sophisticated sensors—windshield-mounted cameras, grille-integrated radars, and/or LiDARs—that continuously scan the environment ahead of the vehicle. The on-board computer analyzes the data from these sensors in real-time to calculate the distance and relative speed of other vehicles, as well as more vulnerable road users such as pedestrians and cyclists. If the system detects a critical situation where a collision is imminent and the driver shows no reaction (braking or evasive steering), the AEB takes control autonomously and progressively. It first issues visual and audible alerts. If there is no response, it can pre-condition the braking system for maximum effectiveness, then apply partial braking and, as a last resort, full-power emergency braking. Its proven effectiveness has made it an essential criterion for achieving 5 stars in Euro NCAP tests and a mandatory technology on all new vehicle types marketed in Europe since July 2022, in accordance with the GSR 2 regulation.
Pre-Collision System
The pre-collision system, also known by various commercial names (Pre-Safe, Pre-Sense, Front Assist), is an advanced active safety technology designed to prevent collisions or mitigate their severity. This system uses a combination of sensors, such as radars, cameras, and sometimes lidars, to continuously monitor the road ahead of the vehicle. By analyzing data in real time, it detects risky situations, such as a sudden slowdown of the preceding vehicle or the presence of an unexpected obstacle (pedestrian, cyclist). When a collision hazard is identified, the system reacts in several stages. It generally begins with a visual and/or audible alert to warn the driver. If the driver does not react, the system can take preparatory measures, such as pre-conditioning the braking system for a faster response or pre-tensioning the seatbelts. In the final phase, if a collision is deemed unavoidable, it can autonomously trigger emergency braking (AEB - Autonomous Emergency Braking) to reduce impact speed or, ideally, avoid the accident entirely. This technology is a cornerstone of Advanced Driver Assistance Systems (ADAS) and contributes significantly to improving road safety.
Forward Collision Warning
Forward Collision Warning, often referred to by the acronym FCW, is an active safety system designed to prevent or mitigate accidents involving frontal collisions. Using a combination of sensors such as radars, cameras, or LiDAR (Light Detection and Ranging) mounted at the front of the vehicle, the system continuously monitors the road. It analyzes in real time the distance and relative speed of the vehicle ahead, as well as other potential obstacles such as pedestrians or cyclists. If the system detects a rapid decrease in distance and calculates an imminent risk of collision, it alerts the driver. These alerts can take several forms, often combined to maximize their effectiveness: a visual signal on the dashboard or head-up display, a shrill audible alert, and sometimes a vibration in the steering wheel or a brief brake jolt (haptic alert). This system is a crucial first line of defense, giving the driver valuable extra reaction time to brake or perform an evasive maneuver. It is often the precursor and essential complement to the Autonomous Emergency Braking (AEB) system, which can intervene if the driver fails to react to the alert.
ABS
ABS, an acronym for the German 'Antiblockiersystem' or Anti-lock Braking System in English, is an essential active safety feature on modern vehicles. Its primary role is to prevent wheel lock-up during hard braking or on low-grip surfaces (rain, ice, gravel). During emergency braking, a driver may instinctively slam on the brake pedal, causing the wheels to lock. Locked wheels lose all steering control, turning the vehicle into an uncontrollable projectile. The ABS intervenes by modulating the braking pressure very rapidly and selectively on each wheel, several times per second. This system consists of wheel speed sensors, an electronic control unit (ECU), and a hydraulic control unit. When the ECU detects that a wheel is about to lock, it commands the hydraulic unit to release and then reapply brake pressure. This process, felt by the driver as pulsation in the brake pedal, helps maintain optimal grip between the tire and the road. Thus, the driver retains the ability to steer the vehicle to avoid an obstacle while optimizing stopping distance on most surfaces. Mandatory on all new cars in Europe since 2004, the ABS is the cornerstone of many other driver assistance systems such as ESP and traction control.