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2017’s Top Ten Tech Cars: Infiniti QX50

The world’s first variable compression-ratio engine

1 min read
Infiniti QX50
Photo: Infiniti

Infiniti QX50Beauty Lies Within: An engine that can vary its compression ratio at will forms the technological heart of the Infiniti QX50.Photo: Infiniti

This Year’s
Winning Autos

We tend to eschew concept cars for our Top Ten list on the grounds that anyone can build a prototype and float pie-in-the-sky claims. But the QX50is an exception, and for more than its energetic crossover design. First, this Infiniti is real, and its technology is coming to showrooms soon, including the first variable compression-ratio engine ever. The new 2.0-liter, four-cylinder engine can adjust its piston stroke to vary compression from about 8:1 to 14:1, heightening efficiency at the lower range and performance up top.

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The EV Transition Explained: Charger Infrastructure

How many, where, and who pays?

7 min read
Illuminated electric vehicle charging stations at night in Monterey Park, California.

Electric vehicle charging stations in Monterey Park, California.

FREDERIC J. BROWN/AFP/Getty Images

The ability to conveniently charge an EV away from home is a top concern for many EV owners. A 2022 survey of EV owners by Forbes indicates that 62 percent of respondents are so anxious about their EV range that travel plans have been affected. While “range anxiety” may be overblown, the need for an extensive and reliable external charging infrastructure is not.

Infrastructure terminology can itself be confusing. For clarity, bear in mind that a charging station is a specific physical location which has one or more charging posts. A charging post itself may have one or more ports, where each port can charge a single EV. Each post may have multiple types of service connectors to support different EV charging connector standards. And a port may supply varying power levels.

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Video Friday: Humanoid Soccer

Your weekly selection of awesome robot videos

4 min read
Humans and human-size humanoid robots stand together on an indoor soccer field at the beginning of a game

Video Friday is your weekly selection of awesome robotics videos, collected by your friends at IEEE Spectrum robotics. We also post a weekly calendar of upcoming robotics events for the next few months. Please send us your events for inclusion.

CoRL 2022: 14–18 December 2022, AUCKLAND, NEW ZEALAND
ICRA 2023: 29 May–2 June 2023, LONDON

Enjoy today’s videos!

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Solving Automotive Design Challenges With Simulation

Learn about low-frequency electromagnetic simulations and see a live demonstration of COMSOL Multiphysics software

1 min read

The development of new hybrid and battery electric vehicles introduces numerous design challenges. Many of these challenges are static or low-frequency electromagnetic by nature, as the devices involved in such designs are much smaller than the operating wavelength. Examples include sensors (such as MEMS sensors), transformers, and motors. Many of these challenges include multiple physics. For instance, sensors activated by acoustic energy as well as heat transfer in electric motors and power electronics combine low-frequency electromagnetic simulations with acoustic and heat transfer simulations, respectively.

Multiphysics simulation makes it possible to account for such phenomena in designs and can provide design engineers with the tools needed for developing products more effectively and optimizing device performance.

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