http://www.mercurynews.com/drive/ci_6706394
"The 2008 2WD GMC Yukon with a 5.3-liter V-8 gets 14 mpg in the city and 20 mpg on the highway, according to the government's www.fueleconomy.gov Web site. Using Bly's numbers, that means the hybrid (which uses a 6.0-liter V-8 for better low-end torque) ought to get 19 to 20 mpg in the city and 21 or 22 mpg on the highway. The vehicle is undergoing certification right now, he says..
...
On my short drive, it was obvious that Bly and his peers - about 250 engineers from GM, Chrysler and BMW who have partnered to create this 2-mode hybrid system, in Troy, Mich. - have achieved a nice balance.
If anything, the driving experience of the GMC Yukon 2-mode hybrid was even more seamless than in other hybrids I've driven. It's all pretty complex, considering that the vehicle also includes GM's Active Fuel Management (AFM) system that cuts out half of the V-8's cylinders when they're not needed.
So, the engine moves from V-8 to V-4, and switches to electric power, too.
It all worked flawlessly. When I'd slow down for a light, the vehicle's regenerative brakes would gather energy and the gas engine would shut down. When that light turned from red to green on 19th Avenue, I slowly depressed the pedal and cruised along in electric mode until I reached about 30 mph. Then the gas motor kicked in....
The 2-mode hybrid transmission - "a piece of art," Bly says - fits into the same space as a standard six-speed automatic. It contains two 60-kilowatt motors, and has four fixed gears, three planetary gear sets and four clutches"
"Active Fuel Management" aka cylinder deactivation isn't that new. Chrysler and Honda (in the 05 Odyssey) had it before GM ever put it on any of their vehicles. I love how this transmission has "four fixed gears, three planetary gear sets and four clutches" vs. the simplicity of the PSD in the Prius. It's not surprising that they also ditched the unnecessary alternator and starter. I guess GM is just 10 years late w/a full hybrid available to consumers?
Test Drive: GMC Yukon Hybrid
Discussion in 'Prius, Hybrid, EV and Alt-Fuel News' started by cwerdna, Aug 25, 2007.
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Discussion in 'Prius, Hybrid, EV and Alt-Fuel News' started by cwerdna, Aug 25, 2007.
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