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

17:42  29 november  2017
17:42  29 november  2017 Source:   autoblog.com

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Infiniti ' s variable compression engine in the 2019 QX 50 is the first of its kind . Underneath the hood is some serious technology. The world's first variable compression ratio engine is here, in a production car.

The 2019 Infiniti brings the world' s first variable compression ratio engine , which makes 268 horsepower and 280 pound-feet of torque.

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.

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infiniti qx50
infiniti qx50

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.

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The world' s first variable compression ratio engine is here, in a production car. That car is the 2019 Infiniti QX 50 , debuting this week at the Los Angeles Auto Show.

Last year, Infiniti announced plans to build a Variable Compression Turbo engine , the first of its kind in a production vehicle. Parent company Nissan says it ’ s been in development for 20 years and it ’ s finally ready for the big time.

Related Video: The 2019 Infiniti QX50 has arrived(Provided by Autoblog)

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.

a silver car on display© Provided by AOL Inc.

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.


2019 Infiniti QX50: Luxury looks and a new kind of engine .
Luxury looks and a new kind of engine<br>Infiniti’s VC-T engine (for Variable Compression, Turbocharged) can change how far its pistons rise in its cylinders, which changes the engine’s compression ratio, a parameter that, heretofore, had been fixed. Infiniti’s engine can bump the compression ratio from a low of 8.0:1 to a high of 14.0:1. Changing an engine’s stroke usually requires a new crankshaft. Instead, Infiniti’s engine introduces a joint between the crankshaft and the connecting rods, and moves the joint with a computer-controlled arm. In the process of changing how high the pistons move, the mechanism incidentally varies the stroke by 1.

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