Sedona, Good, Crew Cab, Se, Overhead Console on 2040-cars

Auto blog

Semi-autonomous Nissan Leaf certified for road use in Japan [w/video]

In order to meet its goal of having an autonomous car in production by 2020, Nissan is going to have be able to test its technology in real-world driving conditions. For this, the automaker has just received a license plate to legally test its semi-autonomous driver assist systems in Japan, marking the first time such technologies have been tested on that country's roads. Not ironically, the license plate number is 2020.
Though not fully autonomous, this Leaf prototype will test various components of a self-driving car including exiting the highway, the ability to stay in its lane and change lanes when needed, stopping at red lights and overtaking stopped or slow traffic. Nissan is also in the process of building a proving ground in Oppama, Japan dedicated solely to autonomous cars, but the ability to test on public roads will obviously play a crucial role in the development of these cars. Scroll down for a short video and press release Nissan posted to mark the occasion.

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 NV200 puts on a Bowtie as new Chevy City Express

Your eyes do not deceive you - that is, in fact, a Nissan NV200 work van with Chevrolet badging. General Motors and Nissan today announced a partnership where the Japanese automaker will build Bowtie-badged vans for Chevy dealers to sell throughout the United States and Canada. The new van, called the City Express, is expected to go on sale in the fall of 2014.
"Our fleet customers have asked us for an entry in the commercial small van segment, so this addition to the Chevrolet portfolio will strengthen our position with fleets and our commercial customers," Ed Peper, US vice president of GM fleet and commercial sales, said in a press release.
No details have been released regarding specific changes for the new City Express, though from the images released today, it's clear that the vehicle's front fascia has been reworked, and some super-sexy new wheel covers have been added. If we're honest, the NV200 wasn't all that pretty to begin with, and this, well, isn't any better. Not that looks are of primary concern in the commercial truck business, of course.