2011 Nissan Altima 2.5 S on 2040-cars

Auto blog

Watch Nissan's autonomous Leaf in action

Getting its semi-autonomous Leaf legalized in Japan was just the first step. Now, Nissan is giving demonstrations of what its fully autonomous car is capable of at this year's Combined Exhibition of Advanced Technologies (CEATEC) show - Japan's equivalent to America's Consumer Electronics Show. To show off the possibilities of its technologies, Nissan had an oval track set up at the show giving rides in an autonomous Leaf to the media. Even Nissan CEO Carlos Ghosn and Toyota CEO Akio Toyodo caught a ride.
Nissan has since released a couple videos of its CEATEC demos, with one designed to look like a news report. In this video, you can watch the car go around the track and navigate intersections and road hazards. The second video shows Ghosn riding in the car, and he hints that Nissan's goal of having an autonomous vehicle in production by 2020 might be more of a worst-case scenario. Watch both videos and read through Nissan's official press release below.

2014 Nissan Rogue

When I first started in this whole automotive journalism biz, I held a sort of hodgepodge receptionist/gopher/production assistant role, and each morning as the staff filed in, I'd ask them how they liked whatever car they were assigned to drive the previous night. Most of my colleagues would regale me with anecdotes about how good or bad a vehicle was, but one co-worker, every single morning, would answer my query with the exact same phrase: "It was fine."
I always assumed this was just a brush-off, an "ask me again after I've had a cup of coffee" sort of response. But then I found myself in a similar moment of brevity following the launch of the 2014 Nissan Rogue earlier this week. After returning home, a friend asked me what I thought of the new Rogue, and I replied, word for word, "It was fine."
And, well, it was. Nothing worth wasting exclamation points over, good or bad. Aside from something like the interesting-to-drive Mazda CX-5 or funky-looking Jeep Cherokee, nothing in this class really tries to set the world on fire. And that, right there, is fine. Nissan doesn't need to do anything crazy with its second-generation Rogue. It just needs to offer a well-equipped crossover that's handsome, functional, efficient and priced right - sticking to the same formula that made the first-generation model so successful while offering the latest crop of creature comforts in a more modern package.

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.