• Aug 1, 2010
Fuso Duonic dual-clutch-transmission – Click above to enlarge

Dual-clutch transmissions have become increasingly popular in small cars and have even appeared in high-performance machines like the Porsche 911 and Bugatti Veyron. Now, Mitsubishi Fuso has become the first commercial truck maker to offer one of these fancy new gearboxes in a hauler.

The new six-speed M038S6 "Duonic transmission" features wet clutches and incorporates the ability to creep in traffic for smoother operation. Although Duonic-equipped trucks will probably be driven mostly in fully-automatic mode, the transmission can also be manually shifted. Mitsubishi Fuso is 85-percent owned by Daimler, with the remainder being held by Mitsubishi.

[Source: Mitsubishi Fuso Truck and Bus Corporation]
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FIRST DOUBLE-CLUTCH TRANSMISSION IN A TRUCK

* Fuso is the first manufacturer worldwide to present a double-clutch transmission in commercial vehicles
* Known as the "Duonic", this double-clutch transmission combines automated driving with the advantages of a manual transmission

Stuttgart/Kawasaki - Fuso has presented a world first with a double-clutch transmission for commercial vehicles. The new transmission drives like an automatic transmission, but unlike a fully automatic torque converter transmission, it makes for lower consumption figures and therefore lower exhaust emissions. The double-clutch transmission is an automated manual transmission. As with a fully automatic transmission it is a two-pedal system, there is an accelerator pedal, a brake pedal and a selector lever. The selector lever allows automatic or manual gearshift mode to be selected.

The M038S6 "Duonic transmission" has six forward gears and a reverse gear. The P-function ensures safe parking by preventing the vehicle from rolling away. "Duonic" features a non-wearing wet clutch, which lowers maintenance costs by eliminating the need to replace worn clutch discs. A creep function has been added to the wet clutch, as is usual for automatic transmission with a torque converter. This enables the vehicle's speed to be easily controlled when moving slowly - for example when manoeuvring or in stop-and-go traffic - and hill-starts are also made easier.

More information about Mercedes-Benz - and a photo with the index number 10A846 - is available online: www.media.daimler.com.

About MFTBC

Mitsubishi Fuso Truck and Bus Corporation (MFTBC) based in Kawasaki, Japan, is one of Asia's leading commercial vehicle manufacturers. In 2009 the company sold around 99,500 light, medium and heavy trucks and buses. Daimler AG holds 85 being owned by Mitsubishi subsidiaries. MFTBC is part of Daimler Trucks within Daimler AG.


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    • 1 Second Ago
  • 26 Comments
      • 4 Years Ago
      This is an area that Detroit has fallen far behind on. Has GM or Ford sold any double clutch transmissions cars in the US?
        • 4 Years Ago
        Ford has sold a small number in the new Fiesta. Detroit is definitely behind in the area right now.

        However, despite that you hear of dual-clutch transmissions often, they still are very far from common. Most makes don't offer a single one. And even those who have them don't offer them on the vast majority of their lineup.
        • 4 Years Ago
        ^
        I was not aware the USDM Fiesta offered one... good to know.

        But in the big picture, Detroit can't wait till every other car makers already has a certain technology and for them to THEN adopt it... Detroit needs to prove that they are technology leaders again and be some of the first car companies to adopt stuff like this. They are already ahead of the game in stuff like DI.

        I don't expect the Cruze or the upcoming Aveo to offer a double-clutch tranny (but that would be a pretty cool option), but it would be nice if cars like the CTS, the new Buick Regal, or the Vette offered it.
      • 4 Years Ago
      Mr. Frederiksen, where did you get your "knowledge" of diesel locomotives? Diesel/electric locomotives have NO transmission - the alternator driven by the prime mover produces alternating current (better production efficiency) rectified to DC to drive electric motors geared to the axles. much like the Tesla's drive (or any axle-mount motor) there is no "shifting" up or down, but a constant amount of HP/Torque applied by the current through the motor to the wheels/road...NO gears or transmission involved. Please research and reference your opinions, and tone down your attitude. I drove a "thousand-wheeler" for 30 years...
        • 4 Years Ago
        SC...You are correct that SOME "New locomotives are AC all the way through."...(I ran 80 MACs for 10 years),but aren't yet numerically predominant for various reasons. All that is irrelevant in this context. Locomotive are necessarily massive to encompass all the equipment and consumables to produce electrical power from mechanical energy, from chemical energy, with losses at each change of power added to inefficiencies of production and transmission. A dual-clutch transmission provides (compared to a Torque-converter - or electrical/electronic/computer-controlled switch gear) direct power delivery to the drive axles...arguably more efficient. Without the multiplication of the T/C, or switch gear circuitry, more "gears" will be advantageous for low HP/Wt vehicles, increasing complication (over the T/C), and some of it's weight advantage over axle or wheel traction motors. Wheel mounted high output also increase unsprung weight - a consideration requiring heavier suspension components and better highway materials and construction - not a problem on a railroad...EMD SD80 and 90MACs weigh in excess of 210 tons (425,000 pounds) due to structure, diesel, alternator, electrical/electronic equipment, trucks and electric motors that can sustain 1000HP each at 5 mph all day. Road vehicles may not require such capacities, but producing usable systems is not easy, or we'd have 'em now. There are a FEW locos in use that might be termed "HYBRID", but that is another can of worms. Now, I'll shut up and look at some AUTOMOBILES. BOb
      • 4 Years Ago
      Wet? bwahahaha, have fun guys.
      • 4 Years Ago
      I think it's a vote of confidence for the intrinsic reliability of dual-clutch gearboxes.

      And the wet-clutch DSG in my VW GTI is def jerky at low speeds. Worth it, but jerky.
      • 4 Years Ago
      Hopefully this and rebranded MB engines as Detroit Diesels , will turn Mitsubishi Fuso's fortunes around. Its diesels have been pretty anemic even by Japanese diesel standards.
      automatic transmissions? . Rejection of these on trucks sounds like pst European attitudes to automatics on cars. Automatics and prior to that ATM systems are the way to go for trucks.
      • 4 Years Ago
      This must be for small (1-5 ton) trucks, not tandems or semis. 6 gears is nowhere near enough for hauling a large load. Also, automatic transmissions in big trucks are stupid.
      • 4 Years Ago
      stupid. series hybrid is better. neater, lighter, more flexible. no gears to shift
        • 4 Years Ago
        Way more expensive. Much heavier and larger.
        • 4 Years Ago
        think diesel electric trains
        • 4 Years Ago
        Diesel electric trains are generally not hybrids. They just use electricity as a transmission (sort of like what Dan suggested).

        mikhalian:
        They do use batteries, but not nearly enough to store much energy from regenerative braking. Don't get me wrong, they can store a lot, but it's a lot less than actually is produced (and needed to get up to speed again).

        They use electric heaters to dissipate the energy since it is too much to store.
        • 4 Years Ago
        paul34, don't assume it has batteries... think a little.
        it's an electromagnetic transmission. it's common on diesel trains.
        sport
        • 4 Years Ago
        GM's Two-Mode started it's life as a truck (well, bus) transmission. It works well enough, but the returns are not great and the system is expensive.
        • 4 Years Ago
        What? You went from a transmission to discussing an entirely different drivetrain. Good work there chief.
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