• Jun 9, 2011
Back in January, ZF Friedrichshafen AG promised a nine-speed transmission, and now the gearbox specialists are ready to deliver some details. ZF claims that the 9HP transmission has been designed for front-wheel-drive vehicles with transversely mounted engines. More importantly for automakers looking to hit ever-increasing fuel economy standards, the transmission will also be able to improve fuel economy by up to 16 percent versus vehicles with the now commonplace six-speed auto. The supplier claims that at optimal fuel consumption speeds the 9HP will allow the engine to run at 1,900 RPM, as apposed to 2,600 revolutions in a typical six-speed-equipped model.

Since ZF is in need of OEMs to include the new 9HP into their products, the supplier went out of its way to make sure the gearbox can adapt to many different applications. The transmission will reportedly be able to handle all-wheel-drive and hybrid duty, and it will be able to handle between 200 and 353 pound-feet of torque. ZF also designed the 9HP to be a "construction kit," with an additional transfer case for all-wheel-drive. It is also stop-start capable, and without the need for an additional oil pump.

ZF hasn't released a timetable detailing when the nine-speed transmission could make its way into production vehicles, but we're guessing some automakers will jump at the chance to feature nine forward gears. For perspective on the 16 percent fuel economy jump, a mid-size sedan that now hits 35 miles per gallon on the highway now could theoretically hit 40 or 41 mpg. Hit the jump to read over the ZF press release, which includes plenty of detail for the engineers among us.
Show full PR text
At the International VDI Conference "Transmissions in Vehicles 2011", ZF Friedrichshafen AG presents an automatic transmission with nine speeds for passenger cars with front-transverse drive. With its two model ranges, it covers a torque range between 280 and 480 Nm. Thanks to its construction kit principle, the basic transmission can be supplemented in line with special requirements. Thus, different starting elements, hybrid and all-wheel drive applications can also be implemented cost-efficiently given the restricted installation space conditions.

Savings of up to 16 percent compared to today's standard 6-speed automatic transmissions in front-transverse installations: The new 9-speed automatic transmission (9HP) owes this fuel efficiency to its extremely high total spread of 9.84. Nevertheless, extremely small gear steps can be realized thanks to the nine speeds. This does not only have a positive effect on driving comfort but, in addition, the engine always runs in the consumption-optimal speed range: In the ninth speed, there are only 1,900 revolutions per minute at 120 km/h instead of 2,600 in case of transmissions featuring 6 speeds.

Revolutionary transmission concept

ZF realized the high number of speeds of the 9HP with the help of four individual gearsets and six shifting elements. It was a big challenge to place these additional components in the transmission; in principle, the transmission installation space in front-transverse passenger cars is highly restricted by the vehicle's width. For this reason, the gearsets have not been allocated on the 9HP's longitudinal axis but were intelligently nested in. This concept was supplemented by using hydraulically operated constant-mesh elements, since these can be integrated without a major impact on the overall transmission length and still enable high efficiency. While multidisk shift elements in the open condition create drag torques, these losses are very low in dog clutches. This aspect is particularly important with regard to the multi-speed concept of the 9HP: Thus, enhanced efficiency generated by small transmission steps is not lost again via drag losses due to the rather complex design.

Enhanced performance and less fuel consumption

A torque converter is used in the 9HP as the standard starting element: Particularly customers in the USA and the Asian markets esteem its smooth starting and maneuvering quality. Here, a multi-level torsion damper system minimizes hydraulic losses while, already at low speeds, facilitating quick bridging of the torque converter lock-up clutch. This is not only beneficiary for fuel consumption and comfort but also for driving dynamics. For an even more direct driving experience, ZF has designed all control components for shorter response and shift times, actually below the threshold of perception.

Flexible transmission control

Direct multiple gearshifts are also possible with the 9HP and give the automatic transmission its sporty character. Thus, the transmission controls can be influenced by the OEM and the end customer: Shifting points and shifting dynamics are highly variable – from emphasize given to comfort and optimized fuel consumption up to extremely sporty. ZF benefits from its expertise in the area of software development when engineering such highly flexible transmission controls: ATSYS, the shifting sequence control, contains all clutch controls, adaptation functions, and transmission protection functions while ASIS, the driving strategy, ensures that the optimal gear is selected for each driving situation – unnoticed by the driver!

With the 9HP, as a result of cost efficiency and installation space optimization reasons, ZF engineers did not use a fully-integrated mechatronics module for all sensors, actuators, and the electronic control unit (EGS). Instead, ZF develops and produces the EGS under its own aegis: It is installed separately from the – now significantly smaller – hydraulic control unit (HSG), namely on the upper side of the transmission housing. The EGS's computing performance can be increased by another 30 percent when needed. Thus, the 9HP is also equipped for even more comprehensive software functions in the future. The EGS's hardware layout has been designed in such a way that the different OEM requirements can be applied without any problems.

Flexible construction kit

So that the new 9-speed automatic transmission can be installed in as many vehicle applications as possible, it has been prepared as a 'construction kit': e.g. an additional transfer case can be connected for the all-wheel drive operation. To this end, ZF developed an all-wheel drive that can be decoupled (AWD Disconnect). It actuates the rear axle drive only when needed and, thus, saves five percent fuel compared to the permanent all-wheel drive. The 9-speed automatic transmission is, by default and without an additional oil pump, stop-start capable. Since, in the case of restarting, it is only one friction shift element that needs to be closed, response times are indeed highly spontaneous. In addition, the 9HP is easy to hybridize: On the basis of an parallel hybrid architecture, the torque converter is then replaced by an electric motor. Finally, thanks to its open software and interface structure as well as the powerful electronic control unit, it will be possible to integrate the unit flexibly in different vehicle concepts. This diversity of the 9HP construction kit makes the transmission especially efficient for OEMs.


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    • 1 Second Ago
  • 62 Comments
      artandcolour2010
      • 3 Years Ago
      I have 21 speeds on my bike and it uses NO gas. I can't wait for the automakers to catch up!
      jbm0866
      • 3 Years Ago
      I have a GM 6 pseed in my 2010 Equinox and it works very well for most normal driving, but gets a little confused and annoying in heavy stop and go urban traffic. I can only imagine if it had 3 more gears to choose from..
      MechE
      • 3 Years Ago
      Needs more cowbell, I mean gears.
      Shiftright
      • 3 Years Ago
      Meh, I'll wait for the triple clutch 10 speed while I'm waiting for the upcoming Atra 10 blade razor. More is always better, yo.
      Lachmund
      • 3 Years Ago
      zis crazy tshermans
      tantareanujellob
      • 3 Years Ago
      Meanwhile the Toyota Corolla...
        • 3 Years Ago
        @tantareanujellob
        [blocked]
      Dan
      • 3 Years Ago
      That Transmission would be pain annoying. To much shifting. The car would not be able to make up its mind on which gear to be in.
        • 3 Years Ago
        @Dan
        [blocked]
      aa
      • 3 Years Ago
      CVT already. This is getting ridiculous and BMW has already got bad reviews for its 8th speed.
      Goody
      • 3 Years Ago
      If the ZF 8-speed can help a large V6 sedan get ~30 MPG, a 9-speed should do wonders for smaller front-wheel drive cars. Source (http://www.allpar.com/news/index.php/2011/06/charger-mpg-boost-confirmed) .
        Goody
        • 3 Years Ago
        @Goody
        Yes, yes, downvote away - because there is evidence to the contrary!
      joeboarder108
      • 3 Years Ago
      I dont understand how this is in any way superior to a clutched CVT, except in "feel." You'll spend more time shifting than driving.
        Artemiy Pavlov
        • 3 Years Ago
        @joeboarder108
        ZF's 8-speed auto can downshift from 8th to 2nd in a heartbeat. I bet this one ain't no slouch too.
      RJC
      • 3 Years Ago
      Just wait the car drops out of warranty. This 9-speed transmission is going to cost more to rebuild or replace than the vehicle likely will be worth. What used car market?
        jonnybimmer
        • 3 Years Ago
        @RJC
        Right, because the cost of maintenance is a great reason to hold back progress. Do you avoid cars with those expensive variable valve timing systems as well?
      2 Wheeled Menace
      • 3 Years Ago
      Lol, up to 16 percent? Seems like a wild claim to me! How about using direct injection and dual variable valve timing to massively reduce pumping losses across the power band so that you don't need a freaking 9 speed.. O_O Oh wait, that's what everyone else is doing.
        • 3 Years Ago
        @2 Wheeled Menace
        [blocked]
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