ESP improves the control of vehicle dynamics in extraordinary situations such as acceleration and cornering. ESP reduces the risk of skidding under all driving conditions and thus improves the stability of the vehicle while driving over the entire speed range.
The electronic stability control system includes an anti-lock brake system (ABS), electronic differential lock (EDS) and drive wheel drive control system (ASR).
Operating principle
Along with the data obtained during the operation of these devices, the ESP control unit needs additional parameters obtained using highly sensitive sensors. The speed of rotation of the car around its vertical axis, lateral acceleration, pressure in the brake drive system and the rotation of the steered wheels are measured.
By means of the turn of the steered wheels and the speed of the vehicle, the direction intention of the driver is determined, which is continuously compared with the actual mode of operation of the vehicle. In case of discrepancies, for example, the vehicle begins to skid, the ESP brakes the corresponding wheel automatically.
As a result of the effect on the wheel during braking, effective forces stabilize the car. When the car is oversteered (rear axle skid tendency) the effect of the braking force is mainly on the outer front wheel in relation to the turn. With understeer (tendency not to fit into the turn) the rear wheel closest to the turn is braked. ESP operation is accompanied by noise.
The device works in conjunction with ABS. If the ABS fails, the ESP will not work either.
Shutdown
The ESP device turns on automatically when the engine is started and conducts a self-diagnosis.
If necessary, the ESP device can be turned off and on by pressing a key. When the device is switched off, the ESP warning lamp lights up.
Normally, the ESP device should always be on. Only in certain exceptional cases, if slipping is necessary, does it make sense to turn off the device, namely:
- when driving with snow chains,
- when driving on deep snow or loose ground,
- when trying to get out of the buildup after getting stuck. Then turn ESP back on.
Attention. No ESP can go beyond what is physically possible. The mode of driving a car with ESP must also always be determined by the condition of the roadway and the specific traffic situation. Remember this especially on slippery or wet roads. The increased safety potential due to ESP must not provoke dangerous risks!
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