Although they will probably be unaware of it, owners of the new Renault Mégane will be using one of the most electronic advanced braking systems – both in terms of performance, and engineering development. The Mégane is the first vehicle to be fitted with Bosch’s Generation 8 electronic stability program (ESP).
Bosch engineers have enhanced the system’s computing performance, allowing for a number of new functions, such as ‘Understeering Control Logic’ (UCL), developed jointly with Renault, which provides additional driving stability in the case of understeer.
ESP helps counteract skidding or ‘breaking away’ (oversteer) by selectively working the ABS braking and Traction Control and also through direct intervention in the engine management system to reduce power. If the vehicle pushes out over the front wheels upon entering a bend at too high a speed, the ESP's integrated anti-traction control will reduce the engine output should the driver keep stepping on the accelerator. If this should not be sufficient, the ESP will brake down the rear wheel on the inside of the bend, allowing the vehicle to turn better into the cornering move.
Similarly, Understeering Control Logic (UCL) in the new Mégane helps in understeer situations. The new ESP8 with UCL function can safely decelerate the vehicle whether it is under partial braking, acceleration or cruising. Depending on the degree of understeer, this is achieved by reducing engine power and braking all four wheels.Published 14 December 2002