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this value is stored in the SMG control unit.
Teaching in the Axle Difference
The teach-in function for the axle difference must be initiated manually after a change in
the dynamic rolling circumference (tire change, snow chains, etc.) of one or several
wheels on the vehicle to ensure correct operation of the transmission control system.
These differences are also adapted automatically but with a considerable time delay.
This function is initiated manually as follows:
" Vehicle speed between 30 and 150 km/h
" Transmission in position "N"
" Brakes not applied
" Pull both shift paddles on steering wheel for 2 seconds.
Pressure Accumulator Preload
A function for checking the accumulator preload is available for service applications.
The diagnostic procedure evaluates the time required to discharge the accumulator. The
pressure sensor of the hydraulic unit is used to measure the pressure.
The SMG control unit still measures the time required for filling. If a shorter period of
time is required to reach the cutoff pressure this indicates that the nitrogen, which the
accumulator must contain as the preload medium, has leaked out of the accumulator.
The shut-off valve on the pressure accumulator is monitored separately.
24
SMG III
Adaptations
It is necessary to check the gearbox mechanism after replacing a gearbox, components
of a gearbox or the SMG control unit. The following adaptations are provided in the
GT1/DISplus.
The most important adaptations in the gearbox are:
" Shift range mid-points
" Valve characteristics
" Transmission characteristics
" Longitudinal acceleration sensor offset.
Shift Range Mid-Points
This function ensures a gear can be disengaged without previous adaptation of the trans-
mission characteristics.
Valve Characteristics
The shift range valves in the hydraulic system are designed as proportional valves. Due to
the tolerance scatter in series production, it is necessary to teach in the offset current of
these valves.
The current at which the corresponding selector rod begins to move is determined. This
value is stored as the offset current in the SMG control unit.
The current consumption of the proportional valves is determined in both switching
directions.
Transmission Characteristics
In this adaptation phase, the selector rods are moved to the end positions and the actual
values determined.
The measured values indicate whether a gear is engaged.
The selector rod for reverse gear is additionally monitored by a redundant sensor whose
values are also stored.
In addition, the hydraulic pressure is read off at this selector rod and the selector rod is
monitored to ensure it remains in the end position.
Longitudinal Acceleration Sensor
The measured value of the longitudinal acceleration sensor has a constant offset. This
value is determined when the vehicle is at rest in horizontal position and therefore the
longitudinal acceleration is zero.
The actual values are permanently sampled. As soon as a sample value deviates by
more than a reference value, external influences are assumed and the adaptation
procedure is terminated to ensure no falsified acceleration values are measured during
vehicle operation.
25
SMG III [ Pobierz całość w formacie PDF ]
