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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.

Carlos Ghosn brings Nissan Leaf EV to happy nation of Bhutan

The Nissan Leaf has been declared the cleanest car in the US, and it's going to have a good case to claim the same title in Bhutan. Yes, Bhutan, the country famous for measuring Gross National Happiness is about to get serious about the EV Grin. Last December, we learned that Bhutan's capital city, Thimphu, wanted to build up a Leaf taxi fleet. That's when Renault-Nissan CEO Carlos Ghosn went to Bhutan to talk about the project and he has recently returned to deliver some vehicles to the Prime Minister of Bhutan, Tshering Tobgay, who has been advocating for EVs since taking office in July and has set a preliminary target of 2,000 EVs on the streets of Thimphu. Tobgay said his country, "will commit to a program to achieve zero emissions as a nation by a certain target date." It's not an outrageous goal for the Himalayan country, since it generates a lot of hydro-electric power, way more than it can use. There are only around 750,000 citizens of Bhutan and they only use five percent of the clean power made within its borders. Most of the rest goes to neighbor India. The problem, as expressed in Nissan's press release (available below), is that Bhutan takes "almost all of the revenue earned from selling electricity" to buy fossil fuel from India and power its national vehicle fleet. You can probably see how making the switch to EVs can simplify and clean things all around. There's a video of Ghosn's Bhutan trip below. This content is hosted by a third party. To view it, please update your privacy preferences. Manage Settings. Nissan Partners with Bhutan on National EV Strategy Feb. 21 – Thimphu, Bhutan – An electric revolution has begun in Bhutan. The remote Himalayan country, renowned for championing "Gross National Happiness," has taken first steps towards becoming a leading global electric-vehicle nation. Prime Ministers of Bhutan, Tshering Tobgay and Nissan CEO, Carlos Ghosn Prime Minister Tshering Tobgay and Nissan CEO Carlos Ghosn announced a partnership in Thimphu Friday, which will see both parties work toward achieving Bhutan's ambitious clean-energy goals. "We will develop a program, we will commit to a program to achieve zero emissions as a nation by a certain target date," said Tobgay who has backed the EV project since taking office in July last year.

Ghosn predicts autonomous cars on the roads by 2018, if laws allow

Things appear to be going well inside Nissan's autonomous vehicle development program. Until now, the automaker believed that self-driving cars would be ready for major markets like the US by 2020. However, Renault-Nissan CEO Carlos Ghosn is now speeding up that prediction to 2018 in some places, assuming that local laws are ready to accept the computer-controlled vehicles.
"The problem isn't technology, it's legislation, and the whole question of responsibility that goes with these cars moving around," said Ghosn in a speech in France recorded by Reuters. He predicted that the first sales could begin in France, Japan and the US by 2018 and expand elsewhere in 2020.
The alliance has been among the forefront of automakers working on self-driving cars. Nissan has an autonomous Leaf (pictured above) test car that is licensed to drive on Japanese roads. Renault showed off an version of its Zoe EV earlier this year called the Next Two, that could pilot itself at speeds up to 18 miles per hour, and that the company predicted would be ready by 2020.