1.6.8. Electronic system of dynamic stabilization (ESP)

Fig. 1.155. ESP switch of the central console

The electronic system of dynamic stabilization increases stability of the car at the movement.
ESP increases efficiency of control of dynamics of the movement of the car in extraordinary situations, for example, at dispersal and on turns. ESP reduces danger of a drift under any traffic conditions and by that improves stability of the car during the movement in all range of speeds.
The protivoblo-kirovochny device of the brake system (ABS), electronic blocking of differential (EDS) and system of regulation of the drive of driving wheels (ASR) enter electronic system of dynamic stabilization.
Principle of action
Along with the data obtained during the operation of these devices the ESP control unit needs the additional parameters received from highly sensitive sensors. Speed of rotation of the car around its vertical axis, cross acceleration, pressure is measured in system of the brake drive and turn of the operated wheels.
By means of turn of the operated wheels and speed of the car intention of the direction of the movement of the driver which is continuously compared to the actual operating mode of the car is defined. At divergences, for example, the beginning of a drift of the car, is automatically braked by the ESP device the corresponding wheel.
Impact on a wheel when braking effective forces is resulted by stabilization of the car. At an excess povorachivayemost of the car (a tendency to a drift of the back bridge) influence of brake effort is carried out mainly on a forward wheel, external in relation to turn. At an insufficient povorachivayemost (a tendency not to fit into turn) the back wheel, next to turn, is braked. Work of ESP is followed by noise.
The device works in combination with ABS. At failure of ABS also ESP will not work.
Switching off
The ESP device turns on automatically at launch of the engine and carries out self-diagnostics.
If necessary the ESP device can be disconnected and turned on pressing of a key. At the switched-off device the control lamp of ESP burns.
Usually the ESP device has to be always switched on. Only in certain exceptional cases in need of skidding it makes sense to switch-off the device, namely:
– at the movement with antisliding chains;
– at the movement on deep snow or friable soil;
– in attempt to leave a vraskachka after jamming. After that include ESP again.

The mode of driving of the car also always has to decide on ESP by a condition of the carriageway and a concrete road and transport situation. You remember it first of all on the slippery or wet road. The increased safety potential caused by ESP should not provoke to dangerous risk.