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ELECTRONIC STABILITY CONTROL INTEGRATED PROGRAM (ESCi)
6
UNDERSTEER CORRECTION
Understeer is when the vehicle pushes straight
ahead rather than turning in the direction intended
by the driver. The system will react to under steer
by braking the inner rear wheel. This creates a
reactive force to stabilise the vehicle and keep it
on course.
Over steer is the opposite, i.e. when the vehicle
turns in much more than intended by the driver.
The system will react to over steer by braking the
outer front wheel.
OVERSTEER CORRECTION
Over steering is defined as a situation in which the
vehicle yaw rate exceeds the target yaw rate
given by the driver (as a result of steering wheel
Angle input). The purpose of the function is to
detect a deviation of the vehicle's yaw rate from
the target yaw rate and react accordingly,
applying Individual wheel brakes to create a
counteracting moment around the z- axis of the
vehicle. This counteracting moment is created by
braking the Rear outside and if necessary, the
front outside wheel.
NOTE
When a vehicle is taking a right turn the right side
wheels are called inner wheel and the left are
called outer wheels. Similarly when taking a left
turn the left wheels are called inner wheels and
right wheels are called outer wheels.
ESCi brake control might also be combined with
reductions in the engine torque if necessary.
When ESCi or TCS is active the warning lamp will
flash as an indication to the driver. During control
the driver may feel the engine power reduce or
the individual brakes being applied. The system
will support the driver within the boundaries of the
vehicle and environmental physical limits. The
ESCi cannot prevent accidents that are the result
of excessive speed.