Ford, GM Join Forces for 9-, 10-Speed Automatic Transmissions
April 15, 2013 9:32 AM
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Automakers hope to save millions of dollars with joint development
Ford and General Motors have announced that they have teamed up to jointly develop a new generation of advanced 9- and 10-speed transmissions that will be used in cars, crossovers, SUVs, and trucks.
The automakers say that the new transmissions will increase both performance and fuel economy. Engineering and development work for the transmissions is currently underway.
“Engineering teams from GM and Ford have already started initial design work on these new transmissions,” said Jim Lanzon, GM vice president of global transmission engineering. “We expect these new transmissions to raise the standard of technology, performance and quality for our customers while helping drive fuel economy improvements into both companies' future product portfolios.”
Automakers need every edge they can get to meet the looming
federal CAFE guidelines
set to go into effect over the next several years. With a greater number of gear ratios available in the transmission, the engine can operate at more efficient RPMs, which in turn leads to improved fuel economy.
Some industry analysts believe that a nine-speed automatic transmission could increase fuel economy by five to ten percent compared to the same vehicle using a six-speed transmission.
The two companies have collaborated on transmission technology in the past. Ford and GM previously collaborated to build a six-speed transmission for front-wheel drive cars. Ford currently uses the six-speed transmission and vehicle such as the Fusion and Edge. GM uses the transmission in the Malibu and Cruze among others.
Chrysler is currently using an
eight-speed automatic transmission
in some of its automobiles, including its popular line of trucks.
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RE: Continuously Variable Transmission (CVT)
4/19/2013 2:46:57 PM
DISCLAIMER: I am speaking for myself and not my employer.
I'm not 100% sure on the Murano CVT thermal management design, but I can tell you this: car makers hate to put duplicate or redundant systems unless they absolutely have to. So if there are two coolers, chances are - there's a REALLY good reason why both would exist (and switching between one to another is probably also due to a REALLY good reason (out of necessity) and not because they feel like it.)
Yeah, that's pretty much how double conical CVTs work. (Sorry, I always keep thinking that that's just general knowledge, but maybe it isn't.) Uh...the pressure controller probably isn't as accurate as you might think is necessary.
The thing that people forget is that everything is designed with a reason/purpose in mind. If you're trying to hit 54.5 mpg with a 6-speed, it's going to be INCREDIBLY difficult for you.
The fundamental operating principle/reason why CVTs were invented was to always be running at the peak/optimial efficiency at a given load with a given torque output/transfer. It was supposed to be about peak efficiency, but people being people - were complaining about how they don't feel the shifts blah blah blah, so we had to change the shift program to deal with that and take it away from its true purpose.
I LOVE how people think that accelerating MUST mean that your revs change instead of revving the piss outta the engine while the torque is being transferred in a controlled manner. It's no different (in principle of operation) as slowly letting out the clutch on a traditional manual. *rolls eyes*...sigh....
CVTs make it "dull" because you can't have a discontinuous torque function. You don't get the abrupt changes in torque like you do with discrete gears. In theory, there's nothing that says that you can't design the control algorithm to allow for rapid changes to the conical controller, but you might end up with jerky shifting under normal operation (cruising), which now adds the complexity of having a variable pressure valve in the hydraulics which also now means you need a controller for the valve assembly AND the controller for the conicals. Which means extra cost. Which people don't want to pay for.
Some AMTs/SMTs have electrohydraulic clutch packs that make the entire transmission more efficient than traditional manuals. And they're also already working on an e-clutch (in case people here aren't aware of that). It's been going on for a few years actually.
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