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Infiniti's variable compression engine in the 2019 QX50 is the first of its kind

The world's first variable compression ratio engine is here, in a production car. That car is the 2019 Infiniti QX50, debuting this week at the Los Angeles Auto Show. The midsize crossover has seen a refresh that has brought it an all-new platform together with new driver assist features, but it's the engine that's the centerpiece here. Nearly everything is continuously variable under the hood of the QX50 – not only the new shift-by-wire XTRONIC CVT. The new VC-Turbo gasoline engine is able to change its compression ratio from 8:1 to 14:1, or anything in between depending of the driving situation; whether there is need for top-end power or turbodiesel-like torque from low revs, or optimized fuel economy. The pistons' reach is continuously adjusted by an electric "Harmonic Drive" motor, which controls a multi-link system, affecting the top-dead-center of the pistons and changing the compression. The engine can also switch between efficiency-maximizing Atkinson cycle and regular combustion cycle, on the go – and there's both multipoint injection and gasoline direct injection employed. The result is 268 horsepower at 5,600 rpm and 280 pound-feet of torque at 4,400 rpm; good figures for a 2.0-liter four-cylinder gasoline engine with a single-scroll turbocharger. Infiniti says that the FWD version's fuel economy of 27 miles per gallon combined is 35-percent better than the previous-generation V6 engine; in AWD guise, it reaches 26 mpg, which is a 30-percent improvement. The new engine is pretty much all-aluminum, but the vaguely magical-sounding "transformative multi-link components" behind the variable compression system are made from high-carbon steel alloy. The engine's multi-link system also enables it to do away with any balancing shafts, and Infiniti compares its smoothness to a V6 rather than a regular four-cylinder. In addition to the aforementioned tech, the VC-Turbo engine has the world's first active engine mount vibration damping system to smoothen its operation even further. Related Video:

Popular Science magazine's Best Of What's New 2012 all ate up with cars

Popular Science has named the winners in its Best of What's New awards, the victors coming in the categories of aerospace, automotive, engineering, entertainment, gadgets, green, hardware, health, home, recreation, security and software. The automotive category did not go wanting for lauded advancements:
Tesla Model S: the Grand Award winner for being "the standard by which all future electric vehicles will be measured."
BMW 328i: it's 2.0-liter turbocharged four-cylinder gets called out for being more powerful and frugal than the six-cylinder it replaces.

Infiniti is blazing an unconventional path to electrification

When it comes to electrification, Infiniti has a history of speaking a great deal but doing little. The Nissan-owned company's plug-in offensive will start in the 2020s, and it provided preliminary details about the technology that motorists can expect to find in showrooms in the not-too-distant future. Eric Rigaux, Infiniti's general manager of product strategy and planning, told Roadshow the firm's engineering department is putting the final touches on two forward-thinking electrified powertrains. The first one will run solely on electricity, while the second one will rely on a gasoline-powered generator to provide more range. Both are being developed to fit into a flexible new platform. Technical details about the electric setup remain vague, so we don't know how big of a battery pack Infiniti will use, or how many motors will draw electricity from it. However, Roadshow learned the gasoline-electric layout will never need to be plugged in, because a 1.5-liter, three-cylinder engine equipped with Infiniti's innovative variable-compression technology will produce the electricity it needs to run. The triple won't directly spin the wheels; it will channel the juice it creates to a battery pack. It's not a zero-emissions solution, but it's one that makes a lot of sense, because users won't need to wait for a charge, and they'll be able to drive for about 500 miles between fill-ups. The now-defunct Chevrolet Volt featured a similar drivetrain, but owners had the possibility of plugging it in. Infiniti won't give motorists that option; there won't be a plug anywhere on the car. Fluid-filled motor mounts and active noise cancellation will ensure the passengers don't feel or hear the triple whirring away. Meanwhile, two electric motors (one over each axle) will deliver between 248 and 429 horsepower; final specifications haven't been signed off yet. And, because power will come from gasoline, there's no need to integrate a bulky battery pack into the chassis. Infiniti's future gasoline-electric models won't require anything bigger than a 5.1-kilowatt-hour unit, which can unintrusively be stuffed under the trunk floor or sandwiched between the floor and the rear seat. Infiniti chose a crossover to inaugurate its battery-electric powertrain; the QX Inspiration concept (pictured) unveiled during the 2019 Detroit Auto Show shed light on what the model will look like.