Audi TT 2016 Introduction Manual page 37

Damping characteristic
Three different damping characteristics are available. They
can only be set by selecting the relevant mode in Audi drive
select. Depending on preference, the driver can choose
between comfortable (comfort), sporty (dynamic) and
balanced (auto) damping characteristics.
comfort
auto
dynamic
individual
Special functions
Temperature model
Special software is used to make allowance for the tem-
peratures of the dampers, magneto-rheogical fluid,
damper pistons and the electrical wiring. The software has
been updated so the influence of temperature can be
determined more precisely and the damper specific activa-
tion currents can be set accordingly.
The base resistance value is now determined for each coil
after the ignition is switched on if the vehicle has been
parked for more than three hours. During the three hour
down time, the components will have reached ambient
temperature. This allows the exact measured value for
ambient temperature to be used as the initial value for the
the temperature model.
Temperature monitoring and temperature shut-off
If the measured damper temperature exceeds 230 °F
(110 °C), the dampers are gradually de-energized to
protect the electrical and mechanical components. The
dampers are fully de-energized at about 248 °F (120 °C).
This situation is extremely rare and occurs only if the
dampers have been subjected to excessive excitation from
performing a significant amount of work over a prolonged
period of time.
Vehicle: Audi drive select
68
°F
Depending on the degree of damping, the coils in the
damper pistons are activated by the output stages of the
control module by applying up to about 5 A of current
(maximum damping). The damper is not permanently
activated when the vehicle is stationary.
During the down time, the control module sends a cyclic
diagnostic pulse (about 2A for a few milliseconds once a
second) to the damper coils to measure the resistance of
the coil resisters. The temperature of each damper is calcu-
lated from these resistance values.
If the vehicle has been parked for less than three hours, the
control module determines the damper temperature when
the ignition is switched on based on the the last tempera-
ture calculated. It also takes the actual down time of the
vehicle into consideration.
Electronic Damping Control Module J250
The temperature of the control module is also monitored
and factored in the temperature model calculation. The
components and the wiring in the control module heat up
from the activation currents during vehicle operation. If a
temperature of approximately 248 °F (120 °C) is exceeded,
AUTO mode is activated. The driver will be unable to select
a different mode until the temperature drops below 212 °F
(100 °C) at which time full system availability will be
restored.
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