TheVoith DIWA automatic transmission was designed byVoith primarily for city-buses and suburban buses. The transmission utilizes aDifferential-Wandler (Converter) or DIWA which replaces two gears which would be used on a conventional transmission. Voith has designed many variations and generations of the Voith DIWA transmission.
Uninterrupted throttle sensor (at least seven-stage throttle + kickdown) / signal by the trip computer
Newly added input speed sensor and back gear planetary gear ring speed sensor, the former is used to check the difference between input and output speed when rotating the gear, while the latter is used to check the back gear planetary gear when the retarder is locked for more precise control.
The hydraulic retarder will go out when the vehicle speed is too low. After turning back for a gear, gently bite the back gear and slow down.
The oil circuit is controlled, especially the oil pressure of the torque converter is controlled.
Most oil valves can sense independently to control the output oil pressure (any 0-100% of the operating pressure), and the clutch force more efficiently. The operating pressure always keep at 100%. Therefore, no need for accumulation delays.
D381.4 is D851.3E with a different planetary gear and input flange configuration for theVolvo B10M.
DIWA.5 (D824.5/D854.5/D864.5/D884.5)
Deleted three-speed version due to high speed fuel wasting
(e.g. the D863 rotates at 2500rpm while D864 rotates at 1700rpm when the bus is at 70 km/h)
offering with six types of pump wheels: L, F, G, V, X, H
DIWA.6 (D824.6/D854.6/D864.6/D884.6)
Stop-Start System added
The operating pressure will be adjusted according to the road situation. It is necessary to increase it at first, which can reduce unnecessary load of oil pumping and save fuel.
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