Electronic Stability Program (ESP) and Acceleration Slip Regulation system (ASR)
Electronic Stability Program (ESP)
The third "building block" in modern braking systems, stability control incorporates everything ABS and traction control do plus a yaw-sensing feature that works to increase traction during potential side-skidding situations. In other words, whereas both ABS and traction control work on the longitudinal (front-to-back) axis of the vehicle, stability control operates on the lateral (side-to-side) axis.
"In 1996 the Electronic Stability Program (ESP) antiskid system became standard on the SL600 and optional on the SL500. It used sensors to monitor steering angle, individual wheel speed, lateral acceleration, and brake pressure to determine when the car was sliding. The ESP system then applied brakes to individual wheels as needed, to help maintain control."
Mercedes-Benz was one of the first vehicle manufacturers to codevelop anti-lock brakes, with the Robert Bosch Corporation. It was also one of the first to equip its predominantly front-engine, rear-wheel-drive cars with traction control. Its acceleration slip regulation system (ASR) has progressed from ASR I, II, III and IV to the current system of electronic stability protection (ESP). ASR I and II had no self-diagnostic capability. Since these cars are at an age where the systems are failing, they are being brought into independent shops for repair. The lack of self-diagnostics, plus the complexity of the ASR II system, can frustrate even the most experienced master tech. Basically, ASR II combines the electronic and hydraulic components of the anti-lock brake system (ABS) with cruise control/idle speed control. To prevent wheel slip, ASR can apply the rear brakes individually to provide a differential lock effect and also control the throttle.
Vehicle: 2000 Obsidian Black Metallic Mercedes SL 320 V6
Location: Northern Italy near Milan
Posts: 1,800
Great piece of writing lynns.
Here in Europe, as far as I can remember the ESP became standart on every Mercedes model since the 2000.
It also became standard on MkII Smarts from year 2002 I think.
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