968 Cabriolet L4-2990cc 3.0L DOHC (1993)
Transmission Control Systems: Description and Operation
Functional Overview
This is how the information is processed in the Tiptronic control unit
The Tiptronic control unit is located in the luggage compartment, on the left side.
The following parameters are constantly supplied to the Tiptronic control unit:
Parameter
Type of measurement
^ Throttle position
Potentiometer resistance
^ Throttle actuation
Time for change of resistance
speed
at potentiometer
^ Engine speed
Frequency measurement (from DME)
^ Driving speed
No. of pulses at pole wheel of transmission shaft
^ Vehicle
Signal from transverse acceleration
transverse acceleration sensor transverse
acceleration on center console
^ Vehicle
Change of no. of pulses
axial acceleration/
within clock time
deceleration
The above values are determined several times per second and are processed in the control unit.
By comparing those measurements with the stored programs, factors are generated that cause the transmission to enter or to shift into one of the five
shift curves.