This article needs to be updated. In particular: In light of advancements in the technology, more information should be added.April 2019)(
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 to minimize the loss of control.
According to the U.S. National Highway Traffic Safety Administration and the Insurance Institute for Highway Safety in 2004 and 2006 respectively, one-third of fatal accidents could be prevented by the use of the technology. ESC has been mandatory in new cars in Canada, the USA, and the European Union since 2011, 2012, and 2014, respectively.
In 1983, a four-wheel electronic "Anti-Skid Control" system was introduced on the Toyota Crown. In 1987, Mercedes-Benz, BMW and Toyota introduced their first traction control systems. Traction control works by applying individual wheel braking and throttle to maintain traction under acceleration, but unlike ESC, it is not designed to aid in steering.
In 1990, Mitsubishi released the Diamante in Japan. It featured a new electronically controlled active trace & traction control system. Named TCL when it first entered the market, the system evolved into Mitsubishi's modern Active Skid and Traction Control (ASTC) system. Developed to help the driver maintain the intended line through a corner; an onboard computer monitored several vehicle operating parameters through various sensors. When too much throttle had been used when taking a curve, engine output and braking were automatically regulated to ensure the proper line through a curve and to provide the proper amount of traction under various road surface conditions. While conventional traction control systems at the time featured only a slip control function, Mitsubishi's TCL system had an active safety function, which improved course tracing performance by automatically adjusting the traction force (called "trace control"), thereby restraining the development of excessive lateral acceleration while turning. Although not a ‘proper’ modern stability control system, trace control monitors steering angle, throttle position and individual wheel speeds, although there is no yaw input. The TCL system's standard wheel slip control function enabled better traction on slippery surfaces or during cornering. In addition to the system's individual effect, it also worked together with the Diamante's electronically controlled suspension and four-wheel steering to improve total handling and performance.
BMW, working with Bosch and Continental, developed a system to reduce engine torque to prevent loss of control and applied it to most of the BMW model line for 1992, excluding the E30 and E36. This system could be ordered with the winter package, which came with a limited-slip differential, heated seats, and heated mirrors. From 1987 to 1992, Mercedes-Benz and Bosch co-developed a system called Elektronisches Stabilitätsprogramm ("Electronic Stability Program", trademarked as ESP) to control lateral slippage.
In 1995, three automobile manufacturers introduced ESC systems. Mercedes-Benz, supplied by Bosch, was the first to implement ESP with their Mercedes-Benz S 600 Coupé. Toyota's Vehicle Stability Control (VSC) system appeared on the Toyota Crown Majesta in 1995. 
General Motors worked with Delphi Automotive and introduced its version of ESC, called "StabiliTrak", in 1996 for the 1997 model year on select Cadillac models. StabiliTrak was made standard equipment on all GM SUVs and vans sold in the U.S. and Canada by 2007, except for certain commercial and fleet vehicles. While the StabiliTrak name is used on most General Motors vehicles for the U.S. market, "Electronic Stability Control" is used for GM's overseas brands, such as Opel, Holden and Saab, except in the cases of Saab's 9-7X and 9-4X (which also use the StabiliTrak name).
The same year, Cadillac introduced an integrated vehicle handling and software control system called the Integrated Chassis Control System (ICCS), on the Cadillac Eldorado. It involves an omnibus computer integration of engine, traction control, Stabilitrak electronic stability control, steering, and adaptive continuously variable road sensing suspension (CVRSS), with the intent of improving responsiveness to driver input, performance, and overall safety bawanaks, similar to Toyota/Lexus Vehicle Dynamics Integrated Management.
In 1997, Audi introduced the first series production ESP for all-wheel drive vehicles (Audi A8 and Audi A6 with quattro (four-wheel drive system)). In 1998, Volvo Cars began to offer their version of ESC called Dynamic Stability and Traction Control (DSTC) on the new Volvo S80. Meanwhile, others investigated and developed their own systems.
During a moose test, Swedish journalist Robert Collin of Teknikens Värld rolled a Mercedes A-Class (without ESC) at 78 km/h in October 1997. Because Mercedes-Benz promoted a reputation for safety, they recalled and retrofitted 130,000 A-Class cars with ESC. This produced a significant reduction in crashes, and the number of vehicles with ESC rose. The availability of ESC in small cars like the A-Class ignited a market trend; thus, ESC became available for all models (whether standard or as an option).
Ford's version of ESC, called AdvanceTrac, was launched in the year 2000. Ford later added Roll Stability Control to AdvanceTrac which was first introduced in the Volvo XC90 in 2003. It has been implemented in many Ford vehicles since.
Ford and Toyota announced that all their North American vehicles would be equipped with ESC standard by the end of 2009 (it was standard on Toyota SUVs as of 2004, and after the 2011 model year, all Lexus, Toyota, and Scion vehicles had ESC; the last one to get it was the 2011 model-year Scion tC). However, as of November 2010, Ford still sold models in North America without ESC. General Motors had made a similar announcement for the end of 2010.
In 2009, the European Union decided to make ESC mandatory. Since November 1, 2011, EU type approval is only granted to models equipped with ESC. Since November 1, 2014, ESC has been required on all newly registered cars in the EU.
The NHTSA required all new passenger vehicles sold in the US to be equipped with ESC as of the 2012 model year, and estimated it will prevent 5,300–9,600 annual fatalities. A similar requirement has been proposed for new trucks and buses, but it has not yet been finalized.
During normal driving, ESC continuously monitors steering and vehicle direction. It compares the driver's intended direction (determined by the measured steering wheel angle) to the vehicle's actual direction (determined through measured lateral acceleration, vehicle rotation, and individual road wheel speeds).
ESC intervenes only when it detects a probable loss of steering control, such as when the vehicle is not going where the driver is steering. This may happen, for example, when skidding during emergency evasive swerves, understeer or oversteer during poorly judged turns on slippery roads, or hydroplaning. During high-performance driving, ESC can intervene when unwanted, because steering input may not always be indicative of the intended direction of travel (such as during controlled drifting). ESC estimates the direction of the skid, and then applies the brakes to individual wheels asymmetrically in order to create torque about the vehicle's vertical axis, opposing the skid and bringing the vehicle back in line with the driver's commanded direction. Additionally, the system may reduce engine power or operate the transmission to slow the vehicle down.
ESC can function on any surface, from dry pavement to frozen lakes. It reacts to and corrects skidding much faster and more effectively than the typical human driver, often before the driver is even aware of any imminent loss of control. This has led to some concern that ESC could allow drivers to become overconfident in their vehicle's handling and/or their own driving skills. For this reason, ESC systems typically alert the driver when they intervene, so that the driver is aware that the vehicle's handling limits have been reached. Most activate a dashboard indicator light and/or alert tone; some intentionally allow the vehicle's corrected course to deviate very slightly from the driver-commanded direction, even if it is possible to more precisely match it.
All ESC manufacturers emphasize that the system is not a performance enhancement nor a replacement for safe driving practices, but rather a safety technology to assist the driver in recovering from dangerous situations. ESC does not increase traction, so it does not enable faster cornering (although it can facilitate better-controlled cornering). More generally, ESC works within the limits of the vehicle's handling and available traction between the tyres and road. A reckless maneuver can still exceed these limits, resulting in loss of control. For example, during hydroplaning, the wheels that ESC would use to correct a skid may lose contact with the road surface, reducing its effectiveness.
Due to the fact that stability control can be incompatible with high-performance driving, many vehicles have an override control which allows the system to be partially or fully deactivated. In simple systems, a single button may disable all features, while more complicated setups may have a multi-position switch or may never be fully disengaged.
Numerous studies around the world have confirmed that ESC is highly effective in helping the driver maintain control of the car, thereby saving lives and reducing the probability of occurrence and severity of crashes. In the fall of 2004, the American National Highway and Traffic Safety Administration (NHTSA) confirmed international studies, releasing results of a field study of ESC effectiveness in the USA. The NHTSA concluded that ESC reduces crashes by 35%. Additionally, SUVs with stability control are involved in 67% fewer accidents than SUVs without the system. The United States Insurance Institute for Highway Safety (IIHS) issued its own study in June 2006 showing that up to 10,000 fatal US crashes could be avoided annually if all vehicles were equipped with ESC. The IIHS study concluded that ESC reduces the likelihood of all fatal crashes by 43%, fatal single-vehicle crashes by 56%, and fatal single-vehicle rollovers by 77–80%.
ESC is described as the most important advance in auto safety by many experts, including Nicole Nason, administrator of the NHTSA, Jim Guest and David Champion of Consumers Union of the Fédération Internationale de l'Automobile (FIA), E-Safety Aware, Csaba Csere, former editor of Car and Driver, and Jim Gill, long time ESC proponent of Continental Automotive Systems.
The European New Car Assessment Program (EuroNCAP) "strongly recommends" that people buy cars fitted with stability control. The IIHS requires that a vehicle must have ESC as an available option in order for it to qualify for their Top Safety Pick award for occupant protection and accident avoidance.
Components and design
ESC incorporates yaw rate control into the anti-lock braking system (ABS). Anti-lock brakes enable ESC to slow down individual wheels. Many ESC systems also incorporate a traction control system (TCS or ASR), which senses drive-wheel slip under acceleration and individually brakes the slipping wheel or wheels and/or reduces excess engine power until control is regained. However, ESC serves a different purpose from that of ABS or traction control.
The ESC system uses several sensors to determine where the driver intends to travel. Other sensors indicate the actual state of the vehicle. The control algorithm compares driver input to vehicle response and decides, when necessary, to apply brakes and/or reduce throttle by the amounts calculated through the state space (set of equations used to model the dynamics of the vehicle). The ESC controller can also receive data from and issue commands to other controllers on the vehicle such as an all-wheel drive system or an active suspension system to improve vehicle stability and controllability.
The sensors in an ESC system have to send data at all times in order to detect a loss of traction as soon as possible. They have to be resistant to possible forms of interference, such as precipitation or potholes. The most important sensors are as follows:
- A steering wheel angle sensor that determines where the driver wants to steer. This kind of sensor often uses AMR elements.
- A yaw rate sensor that measures the rotation rate of the car. The data from the yaw sensor is compared with the data from the steering wheel angle sensor to determine regulating action.
- A lateral acceleration sensor that measures the vehicle's lateral acceleration. This is often called an accelerometer.
- A wheel speed sensor that measures the wheel speed.
Other sensors can include:
- A longitudinal acceleration sensor that is similar to the lateral acceleration sensor in design, but provides additional information about road pitch, as well as being another sensor for vehicle acceleration and speed.
- A roll rate sensor that is similar to the yaw rate sensor in design, but improves the fidelity of the controller's vehicle model and provides more accurate data in combination with the other sensors.
ESC uses a hydraulic modulator to assure that each wheel receives the correct brake force. A similar modulator is used in ABS. Whereas ABS reduces pressure during braking, ESC may increase pressure in certain situations, and an active vacuum brake booster unit may be utilised in addition to the hydraulic pump to meet these demanding pressure gradients.
At the centre of the ESC system is the electronic control unit (ECU), which contains various control techniques. Often, the same ECU is used for different systems at the same time (such as ABS, traction control, or climate control). The input signals are sent through an input circuit to the digital controller. The desired vehicle state is determined based upon the steering wheel angle, its gradient, and the wheel speed. Simultaneously, the yaw sensor measures the vehicle's actual yaw rate. The controller computes the needed brake or acceleration force for each wheel and directs the valves of the hydraulic modulator. The ECU is connected with other systems via a Controller Area Network interface in order to avoid conflicting with them.
Many ESC systems have an override switch so the driver can disable ESC, which may be used on loose surfaces such as mud or sand, or if using a small spare tire, which could interfere with the sensors. Some systems also offer an additional mode with raised thresholds, so that a driver can utilize the limits of their vehicle's grip with less electronic intervention. However, the ESC reactivates when the ignition is restarted. Some ESC systems that lack an off switch, such as on many recent Toyota and Lexus vehicles, can be temporarily disabled through an undocumented series of brake pedal and handbrake operations. Furthermore, unplugging a wheel speed sensor is another method of disabling most ESC systems. The ESC implementation on newer Ford vehicles cannot be completely disabled, even through the use of the "off switch". The ESC will automatically reactivate at highway speeds, and below such speeds if it detects a skid with the brake pedal depressed.
Availability and cost
ESC is built on top of an anti-lock brake system, and all ESC-equipped vehicles are fitted with traction control. ESC components include a yaw rate sensor, a lateral acceleration sensor, a steering wheel sensor, and an upgraded integrated control unit. In the USA, federal regulations have required that ESC be installed as a standard feature on all passenger cars and light trucks as of the 2012 model year. According to NHTSA research, ABS in 2005 cost an estimated US$368; ESC cost a further US$111. The retail price of ESC varies; as a stand-alone option it retails for as little as $250 USD. ESC was once rarely offered as a sole option, and was generally not available for aftermarket installation. Instead, it was frequently bundled with other features or more expensive trims, so the cost of a package that included ESC was several thousand dollars. Nonetheless, ESC is considered highly cost-effective and may pay for itself in reduced insurance premiums.
Availability of ESC in passenger vehicles has varied between manufacturers and countries. In 2007, ESC was available in roughly 50% of new North American models compared to about 75% in Sweden. However, consumer awareness affects buying patterns, so that roughly 45% of vehicles sold in North America and the UK were purchased with ESC, contrasting with 78–96% in other European countries such as Germany, Denmark, and Sweden. While few vehicles had ESC prior to 2004, increased awareness has increased the number of vehicles with ESC on the used car market.
ESC is available on cars, SUVs and pickup trucks from all major automakers. Luxury cars, sports cars, SUVs, and crossovers are usually equipped with ESC. Midsize cars have also been gradually catching on, though the 2008 model years of the Nissan Altima and Ford Fusion only offered ESC on their V6 engine-equipped cars; however, some midsize cars, such as the Honda Accord, had it as standard by then. While traction control is usually included with ESC, there were vehicles such as the 2008 Chevrolet Malibu LS, 2008 Mazda6, and 2007 Lincoln MKZ that had traction control but not ESC. ESC was rare among subcompact cars in 2008. The 2009 Toyota Corolla in the United States (but not Canada) had stability control as a $250 option on all trims below that of the XRS, which had it as standard. In Canada, for the 2010 Mazda3, ESC was an option on the midrange GS trim as part of its sunroof package, and is standard on the top-of-the-line GT version. The 2009 Ford Focus had ESC as an option for the S and SE models, and it was standard on the SEL and SES models
ESC is also available on some motor homes. Elaborate ESC and ESP systems (including Roll Stability Control) are available for many commercial vehicles, including transport trucks, trailers, and buses from manufacturers such as Bendix, WABCO, Daimler, Scania, and Prevost, as well as light passenger vehicles.
In the US, the Insurance Institute for Highway Safety website shows availability of ESC in individual US models and the National Highway Traffic Safety Administration website lists US models with ESC.
The market for ESC is growing quickly, especially in European countries such as Sweden, Denmark, and Germany. For example, in 2003 in Sweden the purchase rate on new cars with ESC was 15%. The Swedish road safety administration issued a strong ESC recommendation and in September 2004, 16 months later, the purchase rate was 58%. A stronger ESC recommendation was then given and in December 2004, the purchase rate on new cars had reached 69% and by 2008 it had grown to 96%. ESC advocates around the world are promoting increased ESC use through legislation and public awareness campaigns and by 2012, most new vehicles should be equipped with ESC.
Just as ESC is founded on the Anti-lock braking system (ABS), ESC is the foundation for new advances such as Roll Stability Control or Active rollover protection that works in the vertical plane much like ESC works in the horizontal plane. When RSC detects impending rollover (usually on transport trucks or SUVs), RSC applies brakes, reduces throttle, induces understeer, and/or slows down the vehicle.
The computing power of ESC facilitates the networking of active and passive safety systems, addressing other causes of crashes. For example, sensors may detect when a vehicle is following too closely and slow down the vehicle, straighten up seat backs, and tighten seat belts, avoiding and/or preparing for a crash.
While Sweden used public awareness campaigns to promote ESC use, others implemented or proposed legislation.
The Canadian province of Quebec was the first jurisdiction to implement an ESC law, making it compulsory for carriers of dangerous goods (without data recorders) in 2005.
The United States followed, requiring ESC for all passenger vehicles under 10,000 pounds (4536 kg), phasing in the regulation starting with 55% of 2009 models (effective 1 September 2008), 75% of 2010 models, 95% of 2011 models, and all 2012 models.
The Australian government announced on 23 June 2009 that ESC would be compulsory from 1 November 2011 for all new passenger vehicles sold in Australia, and for all new vehicles from November 2013. The New Zealand government followed suit in February 2014 making it compulsory on all new vehicles from 1 July 2015 with a staggered roll-out to all used-import passenger vehicles by 1 January 2020.
The European Parliament has also called for the accelerated introduction of ESC. The European Commission has confirmed a proposal for the mandatory introduction of ESC on all new cars and commercial vehicle models sold in the EU from 2012, with all new cars being equipped by 2014.
The United Nations Economic Commission for Europe has passed a Global Technical Regulation to harmonize ESC standards. Global Technical Regulation No. 8 ELECTRONIC STABILITY CONTROL SYSTEMS was sponsored by the United States of America, and is based on Federal Motor Vehicle Safety Standard FMVSS126.
Electronic stability control (ESC) is the generic term recognised by the European Automobile Manufacturers Association (ACEA), the North American Society of Automotive Engineers (SAE), the Japan Automobile Manufacturers Association, and other worldwide authorities. However, vehicle manufacturers may use a variety of different trade names for ESC:
- Acura: Vehicle Stability Assist (VSA) (formerly CSL 4-Drive TCS)
- Alfa Romeo: Vehicle Dynamic Control (VDC)
- Audi: Electronic Stability Program (ESP)
- Bentley: Electronic Stability Program (ESP)
- BMW: Co engineering partner and inventor with Robert BOSCH GmbH and Continental (TEVES) Dynamic Stability Control (DSC) (including Dynamic Traction Control)
- Bugatti: Electronic Stability Program (ESP)
- Buick: StabiliTrak
- Cadillac: StabiliTrak and StabiliTrak3.0 with Active Front Steering (AFS)
- Chery: Electronic Stability Program
- Chevrolet: StabiliTrak and Active Handling (Corvette & Camaro only)
- Chrysler: Electronic Stability Program (ESP)
- Citroën: Electronic Stability Program (ESP)
- Daihatsu: Vehicle Stability Control (VSC)
- Dodge: Electronic Stability Program (ESP)
- Daimler: Electronic Stability Program (ESP)
- Fiat: Electronic Stability Control (ESC) and Vehicle Dynamic Control (VDC)
- Ferrari: Controllo Stabilità (CST)
- Ford: AdvanceTrac with Roll Stability Control (RSC) and Interactive Vehicle Dynamics (IVD) and Electronic Stability Program (ESP); Dynamic Stability Control (DSC) (Australia only)
- General Motors: StabiliTrak
- Honda: Vehicle Stability Assist (VSA) (formerly CSL 4-Drive TCS)
- Holden: Electronic Stability Program (ESP)
- Hyundai: Electronic Stability Program (ESP), Electronic Stability Control (ESC) and Vehicle Stability Assist (VSA)
- Infiniti: Vehicle Dynamic Control (VDC)
- Isuzu: Electronic Vehicle Stability Control (EVSC)
- Jaguar: Dynamic Stability Control (DSC), and Automatic Stability Control (ASC)
- Jeep: Electronic Stability Program (ESP)
- Kia: Electronic Stability Control (ESC) and Electronic Stability Program (ESP)
- Lamborghini: Electronic Stability Program (ESP)
- Land Rover: Dynamic Stability Control (DSC)
- Lexus: Vehicle Dynamics Integrated Management (VDIM) with Vehicle Stability Control (VSC)
- Luxgen: Electronic Stability Control (ESC)
- Lincoln: AdvanceTrac
- Maserati: Maserati Stability Program (MSP)
- Mazda: Dynamic Stability Control (DSC) (including Dynamic Traction Control)
- Mercedes-Benz (co-inventor) with Robert BOSCH GmbH: Electronic Stability Program (ESP)
- Mercury: AdvanceTrac
- Mini: Dynamic Stability Control
- Mitsubishi: Active Skid and Traction Control MULTIMODE and Active Stability Control (ASC)
- Nissan: Vehicle Dynamic Control (VDC)
- Oldsmobile: Precision Control System (PCS)
- Opel: Electronic Stability Program (ESP) and Trailer Stability Program (TSP)
- Peugeot: Electronic Stability Program (ESP)
- Pontiac: StabiliTrak
- Porsche: Porsche Stability Management (PSM)
- Proton: Electronic Stability Control (ESC) or Vehicle Dynamics Control (VDC)
- Renault: Electronic Stability Program (ESP)
- Rover Group: Dynamic Stability Control (DSC)
- Saab: Electronic Stability Program (ESP) or StabiliTrak
- Saturn: StabiliTrak
- Scania: Electronic Stability Program (ESP)
- SEAT: Electronic Stability Program (ESP)
- Škoda: Electronic Stability Program (ESP) and Electronic Stability Control (ESC)
- Smart: Electronic Stability Program (ESP)
- Subaru: Vehicle Dynamics Control (VDC)
- Suzuki: Electronic Stability Program (ESP)
- Tata: Corner Stability Control (CSC)
- Toyota: Vehicle Stability Control (VSC) and Vehicle Dynamics Integrated Management (VDIM)
- Tesla: Electronic Stability Control (ESC)
- Vauxhall: Electronic Stability Program (ESP)
- Volvo: Dynamic Stability and Traction Control (DSTC)
- Volkswagen: Electronic Stability Program (ESP)
ESC system manufacturers include:
- Fujitsu Ten Ltd.
- Robert Bosch GmbH
- Aisin Advics
- Bendix Corporation
- Continental Automotive Systems
- BeijingWest Industries
- ITT Automotive, since 1982 part of Continental AG
- Johnson Electric
- Mando Corporation
- Veoneer Nissin Brake Systems (former Nissin Kogyo, which owns 49% of the company)
- Teves, now part of Continental AG
- Hyundai Mobis
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|deadurl=(help)CS1 maint: archived copy as title (link)
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This article's use of external links may not follow Wikipedia's policies or guidelines. (August 2012) (Learn how and when to remove this template message)
- Bosch ESC Information
- ChooseESC! a combined initiative from the European Commission, eSafetyAware, and Euro NCAP
- E-Safety list of ESC Media Articles from eSafety Support
- NHTSA on ESC including US Regulation and list of US vehicles with ESC
- Canadian Association of Road Safety Professionals on ESC[permanent dead link]
- Transport Canada on ESC
- Australia (Victoria) on ESC
- European ESC Mandate for Trucks and Coaches
- Glen Nicholson, "ELECTRONIC STABILITY CONTROL (ESC),"ISSUE 2007, Number 3, The Official Newsletter of the Canadian Association of Road Safety Professionals
- Anders Lie, Claes Tingvall, Maria Krafft, and Anders Kullgren, "The Effectiveness of ESC (Electronic Stability Control) in Reducing Real Life Crashes and Injuries," of the 19th Enhanced Safety of Vehicles Conference, 2005
- Australian Monash University Accident Research Centre ESC Study
- Australian Monash University Accident Research Centre ESC Follow Up Study
- G. Bahouth, "REAL WORLD CRASH EVALUATION OF VEHICLE STABILITY CONTROL (VSC) TECHNOLOGY,"
- Michael Paine,"ELECTRONIC STABILITY CONTROL: REVIEW OF RESEARCH AND REGULATIONS," Prepared for ROADS AND TRAFFIC AUTHORITY OF NSW, 2005