SSANGYONG RODIUS 2004.09 Manual page 448

09-6
4892-01
3. ESP SYSTEM DESCRIPTION
1) Principle Of ESP
ESP (Electronic Stability Program) recognizes critical driving conditions, such as panic
reactions in dangerous situations, and stabilizes the vehicle by wheel-individual braking and
engine control intervention with no need for actuating the brake. This system is developed to
help the driver avoid the danger of losing the control of the vehicle stability due to under-
steering or over-steering during cornering.
The yaw rate sensor, lateral sensor and longitudinal sensor in the sensor cluster and the
steering wheel angle sensor under the steering column detect the spin present at any wheels
during over-steering, under-steering or cornering. The ESP ECU controls against over-steering
or under-steering during cornering by controlling the vehicle stability using the input values from
the sensors and applying the brakes independently to the corresponding wheels.
The system also controls during cornering by detecting the moment right before the spin and
automatically limiting the engine output (coupled with the ASR system).
Understeering is when the steering wheel is steered to a certain angle during driving and the
front tires slip toward the reverse direction of the desired direction. Generally, vehicles are
designed to have under steering. The vehicle can return back to inside of cornering line when
the steering wheel is steered toward the inside even when the vehicle front is slipped outward.
As the centrifugal force increases, the tires can easily lose the traction and the vehicle tends to
slip outward when the curve angle gets bigger and the speed increases.
ESP
RODIUS 2004.09
Under steering