Toyota CAMRY 2002 Service Manual page 80

CH-168
2) Determining Oversteer
Whether or not the vehicle is in the state of over-
steer is determined by the values of the vehicle's
slip angle and the vehcle's slip angular velocity
(time-dependent changes in the vehicle's slip
angle). When the vehicle's slip angle is large, and
the slip angular velocity is also large, the ECU
determines that the vehicle has a large oversteer
tendency.
Method of VSC Operation
When the skid control ECU determines that the vehicle exhibits a tendency to understeer or oversteer,
it decreases the engine output and applies the brake of a front or rear wheel to control the vehicle's yaw
moment.
The basic operation of the VSC is described below. However, the control method differs depending on
the vehicle's characteristics and driving conditions.
1) Dampening a Strong Understeer
When the skid control ECU determines that the
vehicle exhibits a strong tendency to understeer,
depending on the extent of that tendency, it de-
creases the engine output and applies the brakes
of the front wheels and inside rear wheel, thus pro-
viding the vehicle with an understeer control mo-
ment, which helps dampen its tendency to under-
steer.
Also, depending on whether the brakes are ON
or OFF and the condition of the vehicle, there are
circumstances in which the brakes might not be
applied to the wheels even if those wheels are tar-
geted for braking.
CHASSIS — BRAKE
Slip Angle
Braking
Force
Direction of Travel of the Vehicle's
Center of Gravity
Movement
of Vehicle
Understeering
Control Moment
Braking Force
Braking Force
Making a Right Turn
151CH18
161ES30