DIWA automatic transmissions for city and intercity buses

DIWA automatic transmissions for city and intercity buses

DIWA automatic transmissions for city and intercity buses

DIWA automatic transmissions for city and intercity buses

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.

    Contact our experts Brochure DIWA NXT

    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

    DIWA NXT

    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: Automatic transmission for all bus operation

      DIWA NXT WITH CRU

      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

      7
      7
      savings through the transmission up to
      16
      16
      reduction in fuel consumption up to
      9
      9
      savings through the hybrid system up to
      Bus 2
      Bus 2

      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.

        Success Story DIWA NXT
        Success Story DIWA NXT 02

        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.

        Corinna Maria Schulte, Managing Director of HSB
        Thanks to our many years of good experience with Voith, we were confident that we were opting for a sophisticated development with the new transmissions. The insights from practical operation during the last few months show that we made the right decision.
        Corinna Maria Schulte, Managing Director of HSB
        DOWNLOAD SUCCESS STORY NOW
        Bus
        Bus

        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.

          Bus
          Bus

          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.

          Dominik Jakob, Managing Director of OK.go
          It also makes economic sense to store the energy generated during braking and deceleration. This energy can then be used for electric starting and for supply of the on-board electrical system. Through this, fuel consumption can be efficiently reduced.
          Dominik Jakob, Managing Director of OK.go
          DOWNLOAD SUCCESS STORY NOW

          DIWA.6 automatic transmission

            Two modern red double-decker buses at a bus stop

            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.

            DIWA.6 Animation

            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

            E300.1 Control Unit SENSOTOP SHIFTING PROGRAM ALADIN DIAGNOSTIC SOFTWARE

            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
            STOP-START TECHNOLOGY BROCHURE

            Functional principle DIWA automatic transmission

            Voith automatic transmission for buses - Comparison scheme of the DIWA functional principle
            Specially developed for public transit buses, these transmissions are a must-have for economical operation: Reduced complexity and less installation effort for the manufacturer, lower fuel consumption and rock-bottom maintenance and service costs for the operator. And not only today - but for the entire service life of the bus.
            Learn more about how it works in our detailed videos

            SensoTop

            The topography-dependent shifting program continually evaluates all key information from the control unit, such as acceleration, load, grade of the road, and dynamically determines the optimum time to shift.

            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.
            This leads to a noticeable drop in operating costs. SensoTop also actively helps protect the environment by reducing carbon and particulate matter emissions.

            E300.1/E310 Control Unit

            Voith’s family of transmission control units represents in-house developments that don’t just fulfill the latest automotive standards, but also perfectly meet Voith’s vigorous requirements for automatic transmissions in city buses. Processing power and memory are perfectly balanced against great value and performance. The tilt sensor captures the grade of the road, laying the foundation for the topography-dependent shifting program, SensoTop.
            Beyond connecting to the vehicle, multiple interfaces link to electronic type plates installed in the transmission. Diagnostic interfaces grant access to the control unit via a diagnostic tester and a telematic control unit (TCU) to transmit data remotely.

            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

            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 SERVICE

            Our Service - Part of Your Business

              Why use Voith Service?
              Why use Voith Service?

              • 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

              To our entire service portfolio Voith Turbo Webshop

              Questions? We are here to help.

                Contact our experts
                Bus Contact
                Bus Contact

                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.

                  160000
                  160000
                  Current distribution of the 160,000 DIWA transmissions used worldwide
                  A world map shows the distribution of currently 150,000 DIWA automatic transmissions used across the globe

                  DIWA in bus rapid transit systems (BRT)

                    Two red BRT buses driving in separate lanes in Bogotá
                    TransMilenio, Bogotá, Columbia
                    – 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

                      Bus at a natural gas station

                      Environmentally-friendly operations in North America

                      When phase two of the GHG regulations went into effect with the aim of reducing greenhouse gases in North American cities, there was a clear uptick in demand for climate-friendly CNG systems. Today, over 400 DIWA.6 transmissions are used in CNG engines throughout North America – a number that keeps on growing.
                      A row of modern new buses

                      Establishing a modern transportation system in Baku, Azerbaijan

                      For the first European games in Baku in 2015, 300 new buses to transport fans were equipped with Voith’s DIWA.5 and DIWA.6 automatic transmissions. This marked the start of the city’s modern public transportation system.

                      Further quality power train products from Voith

                        Drivetrain Excellence - Voith Electrical Drive System for buses
                        Drivetrain Excellence - Voith Electrical Drive System for buses

                        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
                        RIGHT OFFCANVAS AREA