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Electronic stability program : ウィキペディア英語版
Electronic stability control

Electronic stability control (ESC), also referred to as electronic stability program (ESP) or dynamic stability control (DSC), is a computerized technology 〔(T. van Zanten, "Bosch ESP Systems: 5 years of Experience", SAE 2000-01-1633 )〕〔(K. Liebemann, K. Meder, J. Schuh and G. Nenninger, "Safety and Performance Enhancement: the Bosch Electronic Stability Control (ESP)." SAE 2004-21-0060. )〕 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 Insurance Institute for Highway Safety and the U.S. National Highway Traffic Safety Administration, one-third of fatal accidents could be prevented by the use of the technology.
== History ==

In 1983, a series production Four-wheel electronic ''anti-skid control'' is introduced on the Toyota Crown.〔http://www.toyota-global.com/company/history_of_toyota/75years/data/automotive_business/products_technology/technology_development/chassis/index.html 75 Years of Toyota: Chassis〕
In 1987, Mercedes-Benz, BMW and Toyota〔 introduced their first traction control systems. Traction control works by applying individual wheel braking and throttle to keep traction while accelerating but, unlike the ESC, it is not designed to aid in steering.
In 1990, Mitsubishi released the Diamante (Sigma) in Japan. It featured a new electronically controlled active trace & traction control system (the first integration of these two systems in the world) that Mitsubishi developed (see Mitsubishi AWC). Simply named TCL in 1990, the system has now 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 has been used when taking a curve, engine output and braking are 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 newly developed TCL system had a preventive (active) safety function which improved the 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 enables better traction on slippery surfaces or during cornering. In addition to the TCL system's individual effect, it also works together with Diamante's electronic controlled suspension and four-wheel steering that Mitsubishi had equipped to improve total handling and performance.〔("Mitsubishi Motors history 1981–1990", Mitsubishi Motors South Africa website )〕〔("Control Technology" ), Mitsubishi Motors South Africa website 〕〔("Mitsubishi Diamante" ), Mitsubishi Motors South Africa website〕〔("Stability Control" ), Mitsubishi Motors website 〕〔("Traction Control System for Improved Driving Safety" ), SAE Technical Papers〕〔("1992 Mitsubishi Diamante" ), by Tom Incantalupo, Newsday, October 1991〕〔("Electronic Stability Control - Part 1" ), by Michael Knowling, autospeed, May 2006 〕
BMW, working with Robert Bosch GmbH and Continental Automotive Systems, developed a system to reduce engine torque to prevent loss of control and applied it to the entire BMW model line for 1992. From 1987 to 1992, Mercedes-Benz and Robert Bosch GmbH co-developed a system called Elektronisches Stabilitätsprogramm (Ger. "Electronic Stability Programme" trademarked as ESP) to control lateral slippage.
General Motors (GM) worked with Delphi Corporation and introduced its version of ESC called "StabiliTrak" in 1997 for 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, the "Electronic Stability Control" identity is used for GM overseas brands, such as Opel, Holden and Saab, except in the case of Saab's 9-7X which also uses the "StabiliTrak" name.
The same year, Cadillac introduced an integrated vehicle handling and software control system, called 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. Similar to Toyota/Lexus Vehicle Dynamics Integrated Management VDIM.
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 Volvo XC90 in 2003 when Volvo Cars was fully owned by Ford and it is now being implemented in many Ford vehicles.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
ウィキペディアで「Electronic stability control」の詳細全文を読む



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