Operating Logic; Basic Operation; Variable Servo Steering Depending On The Speed Of The Car; Active Return - Fiat TIPO Bedienungsanleitung

O
PERATING LOGIC

Basic operation

Depending on the driver's requirements (torque at the steering wheel) and the speed of the vehicle,
the Electric Steering Node controls the electric servo motor that assists steering column rotation.
The motor applies a torque to the steering column itself by means of a worm screw mechanism,
thereby reducing the steering effort for the driver.

Variable servo steering depending on the speed of the car

As the speed of the vehicle increases, the user proportionally increases the force applied to the
steering wheel, because the resistant force at the wheels decreases as the car speed increases.
As a result, making use of the vehicle speed signal, the Electric Steering Node implements a lesser
degree of steering assistance.

Active return

The return stage refers to the realignment function normally produced by the geometry of the vehicle's
front section when the steering is released after steering.
This function is designed to make the realignment quicker, causing the servo motor to intervene to
assist the normal geometric effect.
The active return correction varies according to the speed of the vehicle:

It is greatest at low speeds.

It is lowest at high speeds.
The servo motor implements out the active return of the steering wheel according to the steering angle
in relation to the centre. The greater the steering angle, the greater the effort of the motor to realign
the wheels.

Damping of steering return oscillations

After the steering wheel is released following a steering manoeuvre, the car's chassis produces
oscillations (A) which, if they persist for a certain time, may become irritating.
The servo motor reduces the amplitude of the oscillations (B) during the return to driving in a straight
line and intervenes to a greater extent at high speeds.

Selectable power assistance

The user can choose between two driving modes using the button in the control panel:

"Normal" for normal assistance at medium and high speeds,

"City" for easier driving whilst parking and at low speeds thanks to greater assistance.
NOTE: pressing the ECO button does not result in any kind of steering assistance. Whether or
not the ECO button is pressed, the driver will experience the same level of assistance: it is the
performance of the vehicle that changes; it will be reduced to favour fuel economy.

Electric Steering Node Calibrations

The system manages 5 different driving calibrations. The Electric Steering Node receives vehicle
information (engine type and steering box type) from the Body Computer via CAN and selects the
correct calibrations from its internal memory.
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