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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 tests fully autonomous ProPilot tech on Tokyo roads

We've been hearing a lot about Nissan's ProPilot technology lately. ProPilot Assist is coming to the U.S. in the Rogue, as well as the Leaf EV. For this generation, the system allows for Level 2 autonomous driving, which is essentially adaptive cruise control paired with a lane-keeping function. Later, Nissan will add ProPilot Park, which allows the car to park itself. The next generation of ProPilot, though, allows for Level 4 fully autonomous driving, even on urban streets, beginning in 2020. Nissan has announced that it has already tested it on public roads during a demonstration in Tokyo. The prototype test vehicle is an Infiniti Q50. It's fitted with 12 cameras, 12 sonar sensors, nine millimeter-wave radar sensors, six laser scanners and high-definition mapping, all run through artificial intelligence. With this combination of hardware and software, the Q50 prototype can navigate across town or on the highway, automating the entire driving duties from the moment the passenger selects a destination until their arrival. It can tackle busy intersections and respond to obstacles in the road, providing what Nissan claims is a "human-like driving feel that gives passengers peace of mind." View 29 Photos "Our next-generation ProPilot prototype showcases technology that will be available for real-world use from 2020," said Takao Asami, Nissan's senior VP of research and advanced engineering. "Today's demonstration is another example of our successful work toward creating an autonomous driving future for all." Autoblog has already had the chance to sample the current generation of ProPilot Assist, in both the Leaf and the Rogue. While there has been a little bit of disagreement in our office, most of us have found the technology to work fairly well, and are looking forward to trying the next generation of semi-autonomous and autonomous systems. As the tech advances, it will only get smoother and smarter. Related Video: News Source: Nissan Green Infiniti Nissan Technology Emerging Technologies Autonomous Vehicles Electric Videos Sedan nissan propilot propilot

2019 Infiniti QX50 gets fancy-pants Autograph interior

The 2019 Infiniti QX50 has primarily garnered attention around car enthusiast circles for its variable compression engine. It's a marvel of engineering that uniquely changes its compression ratio to maximize power and fuel efficiency. It can also switch between Atkinson and regular combustion cycles, utilize multi-point or direct injection, it's turbocharged, and even features an electric motor that controls the variable compression ratio. Nifty stuff, but it seems likely that all that technobabble will make the average buyer of Infiniti's new compact SUV go crosseyed. It may not even be mentioned. "It has an engine? Great, let me see the inside." Well, dear car shopper who doesn't give a hoot about the greasy bits, have we got a bit of QX50 news for you. Infiniti has announced the QX50 Autograph package, a special $2,000 option with a seriously upgraded interior. Fancier materials and unique color schemes were selected, drawing inspiration from luxury beach resorts and being awfully similar to those found in the latest Pantone Fashion Color Trend Report. It's probably best to turn things over to the press release at this point. "Starting with warmer color tones, the rich chocolate brown replicates wood applications in the (beach) resort and the surrounding trees, followed by a creamy off-white representing the sand on a beach. The highlights of a cooler dark navy blue on the center console, reminiscent of ocean water, strike the proper balance between warm and cool, creating a comfortable, yet invigorating environment." Have you gone crosseyed? Well, now you know how it feels when describing the greasy bits to a non car person. Those cream, brown and blue bits are the Pantone colors, which, respectively, are known as "Coconut Milk," "Emperador" and "Sailor Blue." In the QX50, the Sailor Blue-esque blue is applied to the center console, dash and doors in Ultrasuede. The Emperadorish brown is on the steering wheel, leather-wrapped dash top and doors, outer portions of the seats and the lower door portions. Coconut Milk is indicative of the creamy dash color and the seat leather, which is diamond-quilted and contrast-stitched. There's also open-pore wood trim. Though I made light of this, the QX50 Autograph interior is actually quite striking. As Infiniti points out, consumers are starting to embrace color, which is worth celebrating. Give me Coconut Milk, Emperador and Sailor Blue over beige, grey and black any day.