The Need of Steering Angle Sensor in Cars

1
THE NEED OF STEERING ANGLE SENSOR IN CARS
2
The steering angle sensor is an important part of
the electronic control system of the car that
measures the steering wheel position angle and
rate of turn.
3
The modern cars are equipped with systems that
require steering-angle information. This sensor
is located in a sensor cluster in the steering
column.
4
PROPERTIES OF A STEERING ANGLE SENSOR
5
A unique feature of this steering-angle sensor is
the output of the correct angle within the
measurement range directly after ignition-on.
6
The steering angle and steering-angle velocity
are made available via the controller area
network interface.
7
Sensor-internal plausibility tests and special
self-diagnostic functions allow the use of this
sensor in safety systems.
8
WORKING PRINCIPLE A STEERING ANGLE SENSOR
9
The steering angle sensor is fixed onto the
steering shaft, where the hub gear wheel of the
sensor transmits the rotary movement of the shaft
to two measuring gear wheels.
10
In each measuring gear wheel, a magnet is
mounted, whose field changes its direction in
accordance with the rotational movement.
11
The analog values of the GMR elements are
converted into digital information directly on
the circuit, which is then sent to the
microprocessor via a serial interface.
12
The measuring gears have different numbers of
teeth and therefore change their turning position
at different speeds.
13
This measuring principle enables the measurement
of the complete angle range of several
steering-wheel turns without the use of a
rotation counter.
14
NEED TO MEASURE STEERING ANGLE
15
The angle of the steering on its own can be used
to determine where the front wheels are pointed.
16
When combined with other pieces of information
from the accelerometer and wheel speed sensors,
it is possible to measure the dynamics of the
car.
17
In cars, the steering angle sensor has two or
three sensors packaged together. The reason for
multiple sensors is redundancy, accuracy and
diagnostics.
18
LAST LINES
19
The steering angle sensors are electronic units
and it is nearly impossible to know them from the
outside.
20
So, in order to have your car effective at ABS
and stability control diagnostics, knowing how
sensors measure angles and information is
critical.
21
THANK YOU
http//beemerpros.com/