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Infiniti's new VC-T changes the rules of small turbocharged engines

The upcoming Infiniti QX50 crossover does not get our pulse racing, no matter how shapely the QX Sport Inspiration concept that previews it may be. No midsize SUV does, to be fair. But it has something special under the hood – the world's first production variable-compression-ratio engine. That means the QX50's 2.0-liter turbo four, which makes 268 horsepower and 288 pound-feet of torque, will have up to 27 percent better fuel economy. Here's how it works. The trend of moving to smaller, turbocharged engines carries with it one big falsehood. Under low load when the turbo isn't needed, these engines are less efficient than an equivalent engine without a turbo because of the low compression ratio the turbo requires. That is, if you never need the extra power, you're wasting fuel. Turbocharged (and supercharged) engines use a lower compression ratio to prevent detonation. When you force extra air in a cylinder and mix it with fuel, it's more likely to prematurely go boom. Lowering the compression ratio prevents this problem, but it's less efficient. Infiniti's VC-T promises the best of both worlds, with a compression ratio that ranges from 8.0:1 for high-power turbo needs to a 14.0:1 ratio for fuel-sipping efficiency. At its heart the VC-T engine is a simple idea, but it's complicated to explain. Consider yourself warned. The photo below from Infiniti serves as a good visual overview. For the truly nerdy, this patent application covers the mechanical concept. Instead of having the pistons connected to the crankshaft, Infiniti's engine has a pivot arm with a connection on each end. One end connects to the piston, the other connects to a second lower shaft, which is controlled by an actuator arm. At any given time the engine's pistons move up and down according to the lobes on the crankshaft. But the actuator arm can change the angle of the pivot arm up and down. That is, the pistons still move in the same motion with the same stroke, but phase the entire stroke up or down. Move the pivot up and there's less room at the top, which means a higher compression ratio. Move the pivot down and the compression ratio goes down, too. As an added bonus, the lower shaft eliminates the need for counter-rotating balance shafts. Infiniti says this system works constantly and can vary the compression ratio to any number between 8:1 and 14:1. It also uses electronic variable valve timing on the intake valves to switch into Atkinson-cycle combustion for greater efficiency.

Nissan to add Rogue, Murano hybrid around 2015

Except for the limited-production, Toyota-assisted Altima Hybrid, Nissan has pretty much shied away from hybrid vehicles, but that is all about to change. As a part of a plan to launch a total of 15 electrified vehicles by 2016, Nissan is launching the Pathfinder Hybrid, which goes on sale this fall, and we've heard in the past that the Altima will get another hybrid variant, as well. Now, Green Car Reports is confirming that the Murano and the smaller Rogue (seen above in next-gen prototype phase) will both receive hybrid powertrains.
Though riding on different platforms, both hybrid crossovers could share the system being introduced in the Pathfinder, consisting of a 2.5-liter supercharged four-cylinder engine, a 22-horsepower electric motor and a lithium-ion battery pack. There is still no word on when the next-gen Murano will arrive, but the 2014 Nissan Rogue will be introduced on September 10.

Bhutan asks Nissan, Mitsubishi for help with massive EV-only plan

Originally, the somewhat modest plan was to introduce 2,000 electric vehicles to the capital of Bhutan. Then things got bigger when Renault-Nissan CEO Carlos Ghosn paid the country a visit and the Prime Minister of Bhutan, Tshering Tobgay, said his country, "will commit to a program to achieve zero emissions as a nation by a certain target date." Now we're approaching "holy huge" territory. Last week, Tobgay visited Japan to ask Nissan and Mitsubishi for help in possibly replacing every combustion vehicle with an all-electric option. "Gasoline is expensive and unfriendly to the environment." – Bhutan's Prime Minister At the very least, Bhutan wants to make more eco-friendly vehicles available. Tobgay told AsiaNews that, "Gasoline is expensive and unfriendly to the environment. Sustainable transportation will bring citizens happiness," which is something that a country that measures its Gross National Happiness is eager to track. Switching to electric vehicles makes complete sense in Bhutan, since the mountainous Asian nation produces more renewable hydro-electricity than it can use. Ninety-five percent of the zero-emission energy is exported to India, and Bhutan uses the profits to buy fuel from India to then power its vehicles. You can probably figure out for yourself how there's a simpler way to do this. News Source: AsiaNews.it Green Mitsubishi Nissan Green Culture Electric