User Manual

2
EPB
The EPB is a system which controls the brake force by pulling the parking
cable as in conventional existing parking brakes. EPB system includes a DC
motor, a gearbox, a screw, a nut, a current sensor, a Hall-effect force sensor,
an acceleration sensor and an ECU.
Generally, if a driver or a high level system operates the EPB system, the
controller calculates a target force from the parking cable based on the car
mass as well as the inclination of the road as measured by the acceleration
sensor. The EPB increases the brake force by pulling the parking cable
using the DC motor until the brake force reaches the target force. Brake
force is measured by the Hall-effect force sensor.
SAS
SAS (Steering Angle Sensor) measures the rotation angle, angle velocity
and direction of the steering wheel, providing information on the direction in
which the driver wishes to go. Steering angle sensors are required for
systems such as ESC and are also used in electric power steering and
active steering systems (EPS or AFS) as well as parking assistance systems
and curve light systems.
A scan tool can be used to obtain these data in degrees. The SAS is located
in a sensor cluster in the steering column. The cluster always has more than
one steering position sensor for redundancy and to confirm data. The ESC
module must receive two signals to confirm the steering wheel position.
These signals are often out of phase with each other.
Many vehicles require the SAS be reset or recalibrated after an alignment is
performed or parts in the steering system are replaced.
There are three types of reset procedures: systems that self-calibrate on
their own, vehicles that require specific wires or buttons be pressed and,
systems that require recalibration with a scan tool.
Self-Calibration
Some newer vehicles can auto calibrate by having the wheel turned from
lock to lock and then centered and cycling the key.