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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 promising autonomous car production by 2020

Nissan will bring the autonomous car to consumers by the end of this decade. The announcement was made by CEO Carlos Ghosn at the company's US headquarters in Irvine, CA. Nissan has already begun construction of a dedicated proving ground for the self-driving cars in Japan, with completion targeted for the end of 2014.
Teaming with MIT, Stanford, Oxford and others, Nissan has already outfitted Leaf EVs with the Autonomous Drive (Nissan's brand name for the tech), a suite of new technologies developed from the brand's existing Safety Shield technology. The current iteration of Autonomous Drive uses the Around-View Monitoring system and laser scanners to analyze the environment, while artificial intelligence systems have been installed to help navigate and operate in a changing environment.
While it's easy to say that Nissan will bring the technology to market within the next six or seven years, it's more difficult to say at what price Autonomous Drive will be available. Most remarkable about all of this is Nissan's claim that self-driving cars will be both commercially viable and available at "realistic prices for consumers." It's expecting Autonomous Drive to be available across its range within two vehicle generations.

2015 Nissan Murano gets edgier, lighter for NY

Nissan's Murano stands as one of the originators of the crossover movement - it was perhaps the first such vehicle to throw out the idea that a CUV had to look like a boxy, cladded-up sport utility vehicle in order to be successful. Now poised to enter its third generation, the midsize Nissan is not only getting a new look and a host of new technologies, it's getting a new home: Canton, MS.
With dramatic new styling presaged by the Resonance Concept at last year's Detroit Auto Show, the new Murano debuting at this week's New York Auto Show includes a toned-down "V-Motion" nose, and the Japanese automaker's trademark boomerang-shaped light fixtures. Aside from the chunky chrome U-shaped grille element up front, the new Murano's most striking design detail is its cantilevered roof with funky "disconnected" D-pillars, a floating look reinforced by a greenhouse edged in brightwork. Overall, it's a much more bold and expressive piece of design than Nissan's recent second-generation Rogue, fitting, as the Murano has always been on the daring end of CUV design.
Boasting a 0.31 coefficient of drag and a ton of sheetmetal surface development, the Murano's new form is available with LED headlamps and features active grille shutters for improved aerodynamics. The company claims visibility has been improved as well - and not just because of its brilliant available Around View Monitor camera system - Nissan says it has "optimized the angles and thickness of the bottom of the A-pillar," along with fiddling with the size and location of the side mirrors.