CHASSIS - BRAKE
151CH18
Direction of Travel of the Vehicle’s
Center of Gravity
Slip Angle
Movement of Vehicle
189CH101
Control Moment
Braking Force
Braking Force
Braking Force
Making a Right Turn
204CH15
Control Moment
Braking Force
Making a Right Turn
CH-38
b. Determining Rear Wheel Skid
Whether or not the vehicle is in the state of
rear wheel skid is determined by the values
of the vehicle’s slip angle and the vehicle’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 skid
control ECU determines that the vehicle has
a large rear wheel skid tendency.
3) Method for VSC Operation
When the skid control ECU determines that the vehicle exhibits a tendency to front wheel skid or rear
wheel skid, it decreases the motive force 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.
a. Dampening a Front Wheel Skid
When the skid control ECU determines that
there is a large front wheel skid tendency, it
counteracts in accordance with the extent of
that tendency. The skid control ECU
controls the motive power output and
applies the brakes of the front wheel of the
outer circle in the turns and rear wheels in
order to restrain the front wheel skid
tendency.
b. Dampening a Rear Wheel Skid
When the skid control ECU determines that
there is a large rear wheel skid tendency, it
counteracts in accordance with the extent of
that tendency. It applies the brakes of the
front wheel of the outer circle of the turn, and
generates an outward moment of inertia in
the vehicle, in order to restrain the rear wheel
skid tendency. Along with the reduction in
the vehicle speed caused by the braking
force, the excellent vehicle’s stability is
ensured.
In some cases, the skid control ECU applies
the brake of the rear wheels, as necessary.
