Voith DIWA®. 3 E automatic transmissions in Mercedes-Benz buses. Automatic
neutral switch ANS when vehicle is at a halt. Oil change intervals every 120,000 ...
Voith Turbo
Voith DIWA®. 3 E automatic transmissions in Mercedes-Benz buses Automatic 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 DIWA Transmissions – Quality engineering
Engine output
Voith DIWA transmission
Hydraulic part
Gear shifting 1-2
Mechanical part
0
Start-up range (DIWA range)
Competitive transmission
Engine output
Shifting into 1st gear hydr./mech.
1st gear hydr.
Shifting into 2nd gear hydr./mech.
The DIWA principle has proven itself but stays young: The long DIWA driving range – where others have to shift gears (up to 50% more frequently), the DIWA transmission holds its own. This is comfortable and safer for standing passengers; it also means less wear on clutch plates and hence longer service life. Driving and braking with one circuit – and therefore fast response and precise adjustment of the retardation effect. The latter is achieved by controlled converter drainage.
1st gear 2nd gear mech. hydr./mech.
Start-up range (Torque converter transmission)
1st gear (DIWA range)
Traction
2nd gear 3rd gear 4th gear
Driving: Power split with differential converter. Driving Speed
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Driving Speed
Braking power
Braking: Retarder function with the converter.
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The transmissions and gear-shifting programmes are adapted to the environmentally friendly low-emission EURO 3 engines. An electronic-hydraulic control system improves the gear-shifting quality of the transmission in such a way that changes from one gear to the next are virtually imperceptible. As far as CAN is concerned, Voith Turbo is the first manufacturer of transmissions worldwide who has been utilising this technology for years in series-manufactured control systems. An acceleration-dependent gear-shifting programme measures the acceleration and the load conditions of the bus and automatically selects the most economical gear-shifting points. One gearshifting programme is sufficient for all operating conditions. The unique PC diagnosis system controls and records the transmission functions whether the bus is driving or stopping. This includes the facility of monitoring the main operation data.
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Voith principle: Driving and braking in one circuit
DIWA transmissions are continuously adapted to the latest technical developments in the commercial vehicle sector.
Braking stage l ll lll
Other advantages are the integration of the filter in the transmission housing, the smaller stainless steel heat exchanger in design for longer service life, the further development of the torsional vibration damper for lower engine speeds, in order to reduce fuel consumption, as well as the automatic ANS neutral stage which separates engine and transmission completely when the vehicle is at a halt. Maintenance intervals are now every 60,000 kilometres, or – if partly or fully synthetic oils are used – every 120,000 kilometres.
Design and mode of operation of DIWA transmissions
1 2 3 4 5 6
Push-button switch Pedal brake valve Accelerator Electronic control unit Level converter Diagnosis via PC
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1 2
3 5
A hydraulic torsional vibration damper at the transmission input side effectively absorbs engine vibrations. Gear changes are carried out electrohydraulically with patented solenoid valves; the gear-shifting commands are given by the digital control system. The heat exchanger of Voith automatic transmissions is integrated in the cooling circuit of the engine.
IES-CAN, FR Illustration: Four-speed DIWA-transmission 1 Counter-rotating torque converter 2 Impeller brake 3 Lock-up clutch 4 Differential gear 5 Input clutch 6 Epicyclic gear set 7 Epicyclic gear set for reverse gear and retarder 8 Torsional vibration damper 9 Heat exchanger 10 4th gear clutch (only D 854.3 E/D 864.3E) 8
5
4
3
10
2
1
The heart of the transmission is the hydrodynamic converter, acting as a counter-rotating torque converter. Situated in front of it are the pump brake, the lock-up clutch, the differential gearbox for power-splitting, the input clutch and, with DIWA four speed transmissions, the clutch for the fourth gear which is designed as overdrive. Behind the converter, an epicyclical gear combines the hydrodynamic and the mechanical powers. The final epicyclical gear set (7) is for reversing and activating the retarder during braking.
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The control concept: Micro-processor control
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7
9
Digital processing of electric engine signals such as EDC, electronic throttle control etc. The adaptive control system ensures automatic adjustment to engine and vehicle and is therefore a prerequisite for continuously high gear-shifting quality throughout the 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.
Automatic transmissions for Mercedes-Benz Citaro buses Criteria for four-stage transmissions Speed v [km/h] at nominal engine speed related to current MB axle series iA
Engine OM 906 hLA [kW]
iA
v [km/h]
180/205 180/205 180/205 180/205
5,27 5,77 6,21 7,38
119 108 101 85
205 205 205
5,77 6,21 7,38
108 101 85
CITARO L
205 205
5,77 6,21
108 101
CITARO G
205 180/205 180/205 180/205
5,27 5,77 6,21 7,37
119 108 101 85
CITARO
205 205 205
5,77 6,21 7,37
108 101 85
CITARO L
205 205
5,77 6,21
108 101
CITARO G
CITARO
City/Suburbs Stadt/Regional Engine OM 457 hLA [kW]
iA
v [km/h]
185/220/260 185/220/260 185/220/260 185/220/260
4,72 5,27 5,77 6,21
101 91 83 77
185/220/260 185/220/260 185/220/260 185/220/260 185/220/260
4,72 5,27 5,77 6,21 7,38
101 91 83 77 65
185/220/260 185/220/260 185/220/260 185/220/260
4,72 5,27 5,77 6,21
101 91 83 77
185/220/260 185/220/260 185/220/260 185/220/260
4,72 5,27 5,77 6,21
101 91 83 77
CITARO
220/260 185/220/260 185/220/260 185/220/260
5,27 5,77 6,21 7,38
91 83 77 65
CITARO L
220/260 185/220/260 185/220/260
5,27 5,77 6,21
91 83 77
CITARO G
preferably city buses
CITARO
CITARO L
CITARO G
City/Suburbs
4
Automatic transmissions for Mercedes-Benz Citaro Ü regional buses Criteria for four-stage transmissions Speed v [km/h] at nominal engine speed related to current MB axle series iA
Engine OM 457 hLA [kW]
v [km/h]
iA
Engine OM 906 hLA [kW]
CITARO Ü
119 108 101
5,27 5,77 6,21
205 205 205
101
CITARO LÜ
108 101
5,77 6,21
205 205
101 91
CITARO GÜ
108 101
5,77 6,21
205 205
iA
v [km/h]
185/220/260 185/220/260
4,37 4,72
109 101
185/220/260
4,72
185/220/260
4,72 5,27
Regional
Regional
Automatic transmissions for Mercedes-Benz Integro regional buses Criteria for four-stage transmissions Speed v [km/h] at nominal engine speed related to current MB axle series iA
Engine OM 457 hLA [kW]
iA
v [km/h]
185/220/260 185/220/260 185/220/260
4,30 5,22 5,88
121 99 88 Regional
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INTEGRO, INTEGRO L
Voith DIWA®. 3 E automatic transmissions in Mercedes-Benz buses
Voith Turbo GmbH & Co. KG Product Group “Commercial Vehicle Transmissions” P. O. Box 2030 D-89510 Heidenheim/Germany Phone 0049 (73 21) 37-82 49 Fax 0049 (73 21) 37-75 04 E-mail:
[email protected] www.voithturbo.com
Voith automatic transmissions can be easily installed in all Mercedes-Benz buses. Transport operators appreciate the reliability, the consistent gearshifting comfort and the optimum adjustment to environmentally friendly low-emission engines. To date, over 100,000 DIWA transmissions have been delivered. 3
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8
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9 1 2 3 4 5 6 7 8 9
O 405, Köln Transport Citaro, Duisburg Transport Citaro, Solingen Transport Citaro, Aschaffenburg Transport Citaro, Wiesbaden Transport Citaro, Rheinbahn Transport Citaro, Kiel Transport Citaro, Graz Transport Citaro, London Transport
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G 1690 e 3/03 1000 MSW/WA Printed in Germany. Dimensions and illustrations non-committal, subject to change.
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