voith diwa. 3 e automatic transmissions in mercedes-benz · pdf filecitaro citaro l aro g aro...
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Voith DIWA®. 3 E automatic transmissions in Mercedes-Benz busesAutomatic neutral switch ANS when vehicle is at a halt Oil change intervals every 120,000 km, partly synthetic oils may be used (original filling ex works).
AUTOMATIC
Voith Turbo
The DIWA principle has proven itselfbut stays young:
The long DIWA driving range – whereothers have to shift gears (up to 50%more frequently), the DIWA transmis-sion holds its own.
This is comfortable and safer for stand-ing passengers; it also means lesswear on clutch plates and hence longerservice life.
Driving and braking with one circuit –and therefore fast response and pre-cise adjustment of the retardationeffect. The latter is achieved by con-trolled converter drainage.
Voith DIWA� Transmissions –Quality engineering
DIWA transmissions are continu-ously adapted to the latest technicaldevelopments in the commercialvehicle sector.
The transmissions and gear-shiftingprogrammes are adapted to the environmentally friendly low-emissionEURO 3 engines.
An electronic-hydraulic control systemimproves the gear-shifting quality of thetransmission in such a way thatchanges from one gear to the next arevirtually imperceptible.
As far as CAN is concerned, Voith Turbo is the first manufacturer of trans-missions worldwide who has been utilising this technology for years inseries-manufactured control systems.
An acceleration-dependent gear-shift-ing programme measures the acceler-ation and the load conditions of the busand automatically selects the most eco-nomical gear-shifting points. One gear-shifting programme is sufficient for alloperating conditions. The unique PCdiagnosis system controls and recordsthe transmission functions whether thebus is driving or stopping. This includesthe facility of monitoring the main oper-ation data.
Other advantages are the integration ofthe filter in the transmission housing,the smaller stainless steel heatexchanger in design for longer servicelife, the further development of the tor-sional vibration damper for lowerengine speeds, in order to reduce fuelconsumption, as well as the automaticANS neutral stage which separatesengine and transmission completelywhen the vehicle is at a halt. Mainte-nance intervals are now every 60,000kilometres, or – if partly or fully syn-thetic oils are used – every 120,000kilometres.
Braking stage l
Bra
king
pow
erTr
actio
n
1st gear(DIWA range)
4th gear
2nd gear
3rd gear
lll
0
ll
0 Driving Speed
Driving Speed
Eng
ine
outp
ut
0
Hydraulicpart
Mechanicalpart
Gear shifting1-2
Start-up range(DIWA range)
Start-up range(Torque converter transmission)
2nd gearhydr./mech.
0
1st gearhydr.
Shifting into1st gear
hydr./mech.
Shifting into2nd gear
hydr./mech.
1st gearmech.E
ngin
e ou
tput
Voith DIWA transmission
Competitive transmission
Voith principle:Driving and braking in one circuit
Braking:Retarder function with the converter.
Driving:Power split with differential converter.
The heart of the transmission is thehydrodynamic converter, acting as acounter-rotating torque converter. Situ-ated in front of it are the pump brake, thelock-up clutch, the differential gearboxfor power-splitting, the input clutch and,with DIWA four speed transmissions,the clutch for the fourth gear which isdesigned as overdrive. Behind the con-verter, an epicyclical gear combines thehydrodynamic and the mechanical pow-ers. The final epicyclical gear set (7) isfor reversing and activating the retarderduring braking.
A hydraulic torsional vibration damperat the transmission input side effective-ly absorbs engine vibrations. Gearchanges are carried out electro-hydraulically with patented solenoidvalves; the gear-shifting commands aregiven by the digital control system. Theheat exchanger of Voith automatictransmissions is integrated in the cool-ing circuit of the engine.
The control concept:Micro-processor control
� Digital processing of electric enginesignals such as EDC, electronicthrottle control etc.
� The adaptive control systemensures automatic adjustment toengine and vehicle and is there-fore a prerequisite for continuously high gear-shifting quality throughoutthe entire service life of the unit.
� Easy data exchange allows adaptation to new conditions (engine, vehicle, driving conditions).
� CAN-compatible� PC-based diagnosis system
DIWAgnosis enables accurate diagnosis of transmission condition and efficient failure search
� Compatible with Mercedes-Benz STAR diagnosis system.
� Operating data storage allows collection of key vehicle data.
Design and mode of operationof DIWA� transmissions
Illustration: Four-speed DIWA-transmission
1 Counter-rotating torque converter
2 Impeller brake3 Lock-up clutch4 Differential gear5 Input clutch6 Epicyclic gear set7 Epicyclic gear set for reverse
gear and retarder8 Torsional vibration damper9 Heat exchanger
10 4th gear clutch (only D 854.3E/D 864.3E)
98 5 4 3 2 1 7610
1 Push-button switch2 Pedal brake valve3 Accelerator4 Electronic control unit5 Level converter6 Diagnosis via PC
IES-CAN, FR
1
23
6
5
4
CITARO
CITARO L
CITARO G
CITARO
CITARO G
CITARO L
CITARO
CITARO G
CITARO
CITARO G
CITARO L
CITARO L
v [km/h]
101918377
10191837765
101918377
101918377
91837765
918377
Stadt/Regional
City/Suburbs
EngineOM 906 hLA [kW]
180/205180/205180/205180/205
205205205
205205
205180/205180/205180/205
205205205
205205
EngineOM 457 hLA[kW]
185/220/260185/220/260185/220/260185/220/260
185/220/260185/220/260185/220/260185/220/260185/220/260
185/220/260185/220/260185/220/260185/220/260
185/220/260185/220/260185/220/260185/220/260
220/260185/220/260185/220/260185/220/260
220/260185/220/260185/220/260
iA
5,275,776,217,38
5,776,217,38
5,776,21
5,275,776,217,37
5,776,217,37
5,776,21
iA
4,725,275,776,21
4,725,275,776,217,38
4,725,275,776,21
4,725,275,776,21
5,275,776,217,38
5,275,776,21
City/Suburbs
v [km/h]
119108101
85
108101
85
108101
119108101
85
108101
85
108101
4
Automatic transmissions forMercedes-Benz Citaro buses
Criteria for four-stage transmissionsSpeed v [km/h] at nominal engine speed related to current MB axle series iA
preferablycity buses
INTEGRO, INTEGRO L
iA
4,305,225,88
EngineOM 457 hLA[kW]
185/220/260185/220/260185/220/260
v [km/h]
1219988
Regional
EngineOM 457 hLA[kW]
185/220/260185/220/260
185/220/260
185/220/260
CITARO Ü
iA
4,374,72
4,72
4,725,27
iA
5,275,776,21
5,776,21
5,776,21
v [km/h]
109101
101
10191
v [km/h]
119108101
108101
108101
EngineOM 906 hLA[kW]
205205205
205205
205205
CITARO LÜ
CITARO GÜ
Regional Regional
Automatic transmissions forMercedes-Benz Citaro Ü regional buses
Criteria for four-stage transmissionsSpeed v [km/h] at nominal engine speed related to current MB axle series iA
Automatic transmissions forMercedes-Benz Integro regional buses
Criteria for four-stage transmissionsSpeed v [km/h] at nominal engine speed related to current MB axle series iA
5
G16
90 e
3/
03
1000
M
SW
/WA
P
rinte
d in
Ger
man
y.D
imen
sion
s an
d ill
ustr
atio
ns n
on-c
omm
ittal
, sub
ject
to c
hang
e.
Voith DIWA®. 3 E automatic transmissions in Mercedes-Benz buses
Voith automatic transmissions can beeasily installed in all Mercedes-Benzbuses. Transport operators appreciatethe reliability, the consistent gear-shifting comfort and the optimumadjustment to environmentally friendlylow-emission engines. To date, over100,000 DIWA transmissions havebeen delivered.
Voith Turbo GmbH & Co. KGProduct Group “Commercial Vehicle Transmissions”P.O. Box 2030D-89510 Heidenheim/GermanyPhone 0049 (73 21) 37-82 49Fax 0049 (73 21) 37-75 04E-mail: DIWA-Getriebe@voith.comwww.voithturbo.com
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1 O 405, Köln Transport2 Citaro, Duisburg Transport3 Citaro, Solingen Transport4 Citaro, Aschaffenburg Transport5 Citaro, Wiesbaden Transport6 Citaro, Rheinbahn Transport7 Citaro, Kiel Transport8 Citaro, Graz Transport9 Citaro, London Transport
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1
2
8
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