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Brake assist (BA or BAS) or emergency brake assist (EBA) is a term for an automobile braking technology that increases braking pressure in an emergency. The first application was developed jointly by Daimler-Benz and TRW/LucasVarity. Research conducted in 1992 at the Mercedes-Benz driving simulator in Berlin revealed that more than 90% of drivers fail to brake with enough force when faced with an emergency.
By interpreting the speed and force with which the brake pedal is pushed, the system detects if the driver is trying to execute an emergency stop, and if the brake pedal is not fully applied, the system overrides and fully applies the brakes until the anti-lock braking system (ABS) takes over to stop the wheels locking up. [1]
This is a lower level of automation than advanced emergency braking which is a collision avoidance system, which may initiate braking on its own if the onboard computer detects an imminent collision.
Many drivers are not prepared for the relatively high efforts required for maximum braking, nor are they prepared for the "buzzing" feedback through the brake pedal during ABS operation. If an emergency develops, a slow reaction and less than maximum braking input could result in insufficient time or distance to stop before an accident occurs.
EBA is designed to detect such "panic stops" and apply maximum braking effort within milliseconds. It interprets braking behaviour by assessing the rate that the brake pedal is activated.
If the system identifies an emergency, it automatically initiates full braking more quickly than any driver can move his or her foot. Emergency stopping distances can be shortened, reducing the likelihood of accidents – especially the common "nose-to-tail" incident.
An electronic system designed to recognise emergency braking operation and automatically enhance braking effort improves vehicle and occupant safety, and can reduce stopping distances by up to 70 ft (21 m) at 125 mph (201 km/h) [2]
Brake Assist detects circumstances in which emergency braking is required by measuring the speed with which the brake pedal is depressed. Some systems additionally take into account the rapidity of which the accelerator pedal is released, pre-charging the brakes when a "panic release" of the accelerator pedal is noted. When panic braking is detected, the Brake Assist system automatically develops maximum brake boost in order to mitigate a driver's tendency to brake without enough force. In doing so, Brake Assist has been shown to reduce stopping distance by a significant margin (up to 20% in some studies).
Thus the brake assist is neither an Autonomous Emergency Braking nor a Collision Avoidance System as it relies on human input. [3]
In December 1996 BAS premiered to the world on the Mercedes-Benz S-Class and SL-Class. In 1998 Mercedes-Benz became the first company to make Brake Assist standard equipment on all its models; other brands including Volvo and BMW soon followed suit.
Mercedes-Benz Brake Assist Plus (BAS Plus) was first made standard equipment on the W221 (2006 onwards) S-Class Mercedes-Benz. This system works much like the Volvo system with a warning and precharging of the brakes but will not automatically brake for the driver. The BAS Plus system has been shown to significantly reduce the incidence of rear-end collisions, and so is very significant in the development of driver aids that improve road safety. Other systems like the Volvo CWAB (see below) are also available.
The Volvo system Collision Warning with Auto Brake 'CWAB' uses a radar to detect when a collision is likely and will pre-charge the brakes so that when the driver uses the brakes, however lightly, full braking is applied. The system will also flash a light and make a warning sound. If the driver does not respond to the warning at the point where a collision cannot be avoided the system will apply the brakes automatically and dramatically reduce the speed of the collision.
This system is not considered by regulations as an emergency brake assist but as an advanced emergency braking because it does not rely on the driver to brake.
In 1997 Toyota introduced brake assist across most of its worldwide passenger cars. This includes Corolla, Camry, and Yaris.
Volvo cars can also be equipped with the City Safety System which automatically brakes in stop start traffic. Mercedes-Benz also has a similar system called Distronic Plus.
Both the Volvo and the Mercedes-Benz radar systems are also used for the speed/distance regulated cruise control systems used by both manufacturers.
In October 2007 the European Commission announced that it wanted Brake Assist to be included on all new models sold in the EU as standard by 2009. [4]
In the EU, that regulation applies since 24 November 2009 all new passenger car and light commercial vehicle types already had to be equipped with brake assist systems as standard. Since 24 February 2011, this has applied to all new vehicles.
This brake assist regulation is not used in the United States because the United States do not use UNECE regulations. Instead, the USA plan to use the automatic emergency braking (AEB) on a voluntary basis.
Brake assist system is regulated by UN Regulation No. 139, Uniform provisions concerning the approval of passenger cars with regard to Brake Assist Systems, in some UNECE countries. [5] [6]
Brake Assist System (BAS)" means a function of the braking system that deduces an emergency braking event from a characteristic of the driver's brake demand and, under such conditions:
- (a) Assists the driver to deliver the maximum achievable braking rate; or
- (b) Is sufficient to cause full cycling of the Anti-lock Braking System
— UN Regulation No. 139
Many UNECE countries apply this passenger cars regulation since 2016 or 2017. [7]
Entry into force of original version: 22/01/2017. [8]
A seat belt, also known as a safety belt or spelled seatbelt, is a vehicle safety device designed to secure the driver or a passenger of a vehicle against harmful movement that may result during a collision or a sudden stop. A seat belt reduces the likelihood of death or serious injury in a traffic collision by reducing the force of secondary impacts with interior strike hazards, by keeping occupants positioned correctly for maximum effectiveness of the airbag, and by preventing occupants being ejected from the vehicle in a crash or if the vehicle rolls over.
An anti-lock braking system (ABS) is a safety anti-skid braking system used on aircraft and on land vehicles, such as cars, motorcycles, trucks, and buses. ABS operates by preventing the wheels from locking up during braking, thereby maintaining tractive contact with the road surface and allowing the driver to maintain more control over the vehicle.
A brake is a mechanical device that inhibits motion by absorbing energy from a moving system. It is used for slowing or stopping a moving vehicle, wheel, axle, or to prevent its motion, most often accomplished by means of friction.
Electronic stability control (ESC), also referred to as electronic stability program (ESP) or dynamic stability control (DSC), is a computerized technology that improves a vehicle's stability by detecting and reducing loss of traction (skidding). When ESC detects loss of steering control, it automatically applies the brakes to help steer the vehicle where the driver intends to go. Braking is automatically applied to wheels individually, such as the outer front wheel to counter oversteer, or the inner rear wheel to counter understeer. Some ESC systems also reduce engine power until control is regained. ESC does not improve a vehicle's cornering performance; instead, it helps reduce the chance of the driver losing control of the vehicle.
Advanced driver-assistance systems (ADAS) are technologies that assist drivers with the safe operation of a vehicle. Through a human-machine interface, ADAS increase car and road safety. ADAS use automated technology, such as sensors and cameras, to detect nearby obstacles or driver errors, and respond accordingly. ADAS can enable various levels of autonomous driving.
In road-transport terminology, a lane departure warning system (LDWS) is a mechanism designed to warn the driver when the vehicle begins to move out of its lane on freeways and arterial roads. These systems are designed to minimize accidents by addressing the main causes of collisions: driver error, distractions and drowsiness. In 2009 the U.S. National Highway Traffic Safety Administration (NHTSA) began studying whether to mandate lane departure warning systems and frontal collision warning systems on automobiles.
The Mercedes-Benz W221 is a chassis code of the fifth generation S-Class produced from August 2005 until June 2013.
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Adaptive cruise control (ACC) is a type of advanced driver-assistance system for road vehicles that automatically adjusts the vehicle speed to maintain a safe distance from vehicles ahead. As of 2019, it is also called by 20 unique names that describe that basic functionality. This is also known as Dynamic cruise control.
The driver monitoring system, also known as driver attention monitor, is a vehicle safety system to assess the driver's alertness and warn the driver if needed and eventually apply the brakes. It was first introduced by Toyota in 2006 for its and Lexus' latest models. It was first offered in Japan on the GS 450h. The system's functions co-operate with the pre-collision system (PCS). The system uses infrared sensors to monitor driver attentiveness. Specifically, the driver monitoring system includes a CCD camera placed on the steering column which tracks the face, via infrared LED detectors. If the driver is not paying attention to the road ahead and a dangerous situation is detected, the system will warn the driver by flashing lights, warning sounds. If no action is taken, the vehicle will apply the brakes. This system is said to be the first of its kind.
Emergency brake can refer to:
A collision avoidance system (CAS), also known as a pre-crash system, forward collision warning system (FCW), or collision mitigation system, is an advanced driver-assistance system designed to prevent or reduce the severity of a collision. In its basic form, a forward collision warning system monitors a vehicle's speed, the speed of the vehicle in front of it, and the distance between the vehicles, so that it can provide a warning to the driver if the vehicles get too close, potentially helping to avoid a crash. Various technologies and sensors that are used include radar (all-weather) and sometimes laser (LIDAR) and cameras to detect an imminent crash. GPS sensors can detect fixed dangers such as approaching stop signs through a location database. Pedestrian detection can also be a feature of these types of systems.
Automatic braking may refer to:
The World Forum for Harmonization of Vehicle Regulations define AEBS. UN ECE regulation 131 requires a system which can automatically detect a potential forward collision and activate the vehicle braking system to decelerate a vehicle with the purpose of avoiding or mitigating a collision. UN ECE regulation 152 says deceleration has to be at least 5 metres per second squared.
Emergency Assist is a driver assistance system that monitors driver behavior by observing delays between the use of the accelerator and the brake; once a preset threshold of time has been exceeded the system will take control of the vehicle in order to bring it to a safe stop.
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