Audi NAVIGATION SYSTEM PLUS Especificações descarregar pdf (Página 16)

Basic principles

SSP 199-019

SSP 199-020

Function of the angle of turn sensor

The angle of turn sensor is shaped like a tuning

fork.

The two legs of this element are designed as oscil-

lating bodies.

When the ignition is turned on, voltage is applied

to the lower piezoelements. They then begin to

oscillate.

The oscillations are transmitted to both limbs.

When the vehicle changes direction (e.g. when

cornering), the so-called Coriolis force acts on the

oscillating legs of the sensor.

This Coriolis force acts against the direction in

which the vehicle is rotating about its vertical axis.

The upper parts of the legs, which is already oscil-

lating sideways, bend as a result.

The flexure of the legs is transmitted to the upper

piezoelements, thereby generating a voltage in the

piezoelement.

The navigation control unit can calculate the

change in direction of travel from the level of this

voltage.

Direction of oscillation

Rotational axis

Lower

piezoelement

Direction of oscillation

Upper

piezoelement

Coriolis force

Direction of oscillation

Direction of rotation

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Audi NAVIGATION SYSTEM PLUS Especificações Página 16