Economy and environment in focus: DIWA automatic transmissions for buses
Accelerate, shift, brake, shift. City bus operators face numerous challenges on the road each day. As a bus manufacturer or operator, rely on Voith’s globally successful DIWA automatic transmissions. With DIWA, you can benefit from intelligent shifting and reduced downtime, maintenance costs and fuel usage.
Today, over 400,000 city and intercity buses worldwide use a DIWA automatic transmission. Millions of passengers enjoy a more comfortable ride with less noise. At speeds that require other transmissions to shift two to three times, Voith offers you the benefit of stepless accelerating and braking.
Your benefits
- Lower fuel consumption
- Reduced air and noise pollution
- Maximum comfort for passengers
- Low maintenance costs
- Lower installation effort
- Global market leader in CNG buses
- Meets the needs of demanding BRT systems worldwide
The right transmission.
At the right time.
DIWA NXT
DIWA NXT is the consistent response to the growing demand for environmentally friendly drive solutions. Thanks to its hybrid system, the automatic transmission closes the gap to alternative drive systems and achieves fuel savings of up to 16%. DIWA NXT offers fleet operators and drivers a wide range of options in a solution that is efficient, comfortable and quiet.
DIWA NXT is the next generation transmission for city and regional busses and coaches. It is optimized in terms of efficiency with a 2nd overdrive, a separate retarder and an optional Central Recuperation Unit (CRU) based on 48V technology to keep fuel consumption as low as possible.
The DIWA NXT is a mild hybrid system with various advantages. It is highly integrated into the flywheel housing of the engine and works with a specifically developed inverter, which is located on the top of the transmission to avoid line losses. A specifically designed battery and cooling system including an optimized DC/DC converter is available. The 48V mild hybrid system is developed specifically for buses and carries out various functions like stop-start, coasting, recuperation during braking procedures or even boosting-support. The new DIWA NXT is one of Voiths answers on the increasing demand for efficient and green driveline technologies and helps to bridge the gap between Diesel and alternative drivetrain technologies.
- World-premiere: performance of differential converter and retarder can now be independently optimized
- Recuperates braking energy based on a highly-integrated 48V mild-hybrid system
- Reduces fuel consumption by up to 16%
- Reduces air and noise pollution
- Seamless hardware-software integration from one provider: Voith Digital Ventures
Greater efficiency for the new bus generation
DIWA NXT Success Story HSB
Hanauer Straßenbahn GmbH (HSB) was one of the first companies to use the new generation of buses equipped with DIWA NXT on its regular routes. Since the end of 2022, a total of 16 new solo and articulated buses have been out and about on the streets of Hanau, the birthplace of the Brothers Grimm.
Lower pollutant emissions,
lower fuel consumption
HSB’s 13 lines serve a total of 176 stops in a dense network with a length of 111 kilometers covering an area with a largely flat topography. This also means that the vehicles have to repeatedly brake, stop, and move off at short intervals. Average speeds are accordingly low. The reliable stop-start function of DIWA NXT significantly lowers the air pollutant emissions. This also has a positive effect on HSB’s bottom line: the optimized interplay between the motor and the transmission noticeably reduces the fuel consumption.
Demo bus making the rounds in regular service
DIWA NXT Success Story OK.go
Demand for new drive concepts such as DIWA NXT is rising steadily. This is because in order to make further progress in reducing CO2 emissions, bus operators such as OK.go will have to make sweeping changes to their fleets that go beyond the pure internal combustion engine in the coming years.
Multiple-week test phase on the way to greater sustainability
As far as emissions are concerned, the existing engine concepts have largely reached their limits. At the regional bus company OK.go, which, with its vehicles, makes a sizable contribution to public transport in the Ostalbkreis district just outside Stuttgart, the decision-making process for the changeover has also long since begun. The multiple-week test phase for our demo bus, a combination of an Iveco Crossway and DIWA NXT, is an important step in this journey toward greater sustainability.
DIWA.6 automatic transmission
Whatever your requirements as a bus manufacturer or operator, with Voith you’ll find a suitable DIWA automatic transmission that lowers your fuel consumption and decreases your carbon footprint.
Destination: 100% economical – DIWA.6
The DIWA.6 automatic transmission is the global standard for economically advantageous and sustainable city and intercity buses.
Together, intelligent acceleration management and need-based reduction of operating pressure reduce fuel consumption.
As a bus manufacturer or city bus operator, you profit from a dramatic increase in the transmission’s efficiency.
Your benefits at a glance
- Optimized fuel-efficiency
- Lower air and noise pollution
- Maximum passenger comfort and safety
- Tried and true stop-start technology
- Lower maintenance and installation costs
- High degree of reliability and availability
Stop-start technology for DIWA.6
Better for the environment:
Our stop-start technology for your DIWA.6 transmission
City buses spend up to 40% of their operating time in idle mode. Tried and tested worldwide, Voith’s stop-start technology uses this downtime to greatly reduce fuel consumption and emissions. Do your part to combat climate change while making public transportation more attractive.
- Proven in operation in more than 1,500 buses
- Reduces fuel consumption by up to 12 %
- Reduces air and noise pollution
- Greater riding comfort for drivers, passengers, pedestrians and residents
- Software for easy updates
Functional principle DIWA automatic transmission
SensoTop
SensoTop’s abilities have been proven in countless applications worldwide. Depending on topography and vehicle application, real-life potential for fuel savings have been up to 7% compared to an optimized, acceleration-dependent shifting program.
E300.1/E310 Control Unit
The TCU’s software is also developed in-house at Voith. It upholds the highest safety standards and protects the unique DIWA function our customers look for.
DIWA diagnostic software Aladin
The tried and tested diagnostic tool for all DIWA generations enables detailed diagnostics of the transmission and its components. Error data can be read out, and operating data analyzed and interpreted. This aids optimization and power train design.
VOITH DIWA SERVICEOur Service - Part of Your Business
- Everything from a single source: development, design, production – and service!
- Decades of product experience as an original equipment manufacturer and service provider
- Fast and smooth cooperation and best service thanks to a worldwide network of service locations
- Long-term partnership and planning security are guaranteed due to longstanding corporate stability
Questions? We are here to help.
International DIWA references
Worldwide, bus operators large and small value the fuel savings made possible by Voith’s innovative DIWA transmissions. These transmissions have the ability to flexibly adapt to a range of infrastructure and topography specifications, which makes them usable in almost any market. This is especially true in emerging markets such as Africa, where the demand for public transportation is continually rising.
DIWA in bus rapid transit systems (BRT)
– Market share Voith: 84 %
Since TransMilenio’s launch, driving times have dropped by 32% and emissions by 40%. The TransMilenio BRT system transports around 2 million passengers each day, making it one of the most efficient BRT systems worldwide. Today TransMilenio is considered a benchmark for many cities worldwide looking to introduce a BRT system.
Voith is a CNG-powered bus leader
Environmentally-friendly operations in North America
Establishing a modern transportation system in Baku, Azerbaijan
Further quality power train products from Voith
The perfect drive system for changing intra-urban mobility: As an established system supplier with many years of experience and a partner to the bus industry, we have combined our comprehensive know-how in the fields of drive systems and E-mobility. Voith has developed a pioneering electrical drive system for local public transit. The Voith Electrical Drive System (VEDS).
Learn more
