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How GM engineers are using diaper 'snow' to keep you warm

Testing how snow affects General Motors' vehicles isn't really a problem right now for the company's engineers, but in the dog days of summer the process isn't exactly easy. The only real option is for them to book time at the automaker's climatic wind tunnel. However, a flash of brilliance from an engineer allows snow to be simulated regardless of the temperature outside, and the discovery is all because of his daughter's wet diaper. The realization came to GM Thermal Systems engineer Nicholas Jahn while he was swimming with his daughter and noticed how her diaper ballooned in size in the water. He found out the substance that makes this possible is called sodium polyacrylate. When the material gets wet it grows and forms fluffy flakes that are a close imitation of snow. Best of all, the stuff can be prepared easily any time of the year, and it's reusable. The engineering team uses the material to test the effectiveness of the heating systems of GM's vehicles. They spread the sodium polyacrylate over the inlets at the base of the windshield to obstruct the airflow and then crank the heater. After some time, they can see how much is being sucked into the system and design more efficient systems in the future. See how the process works in the video above and read about the diaper discovery in GM's press release below. Diapers Change Chevy Cruze Winter Warm-up Time GM validation engineer uses diaper material "snow" to reduce frigid drives 2015-01-06 DETROIT – An item commonly found on an infant's changing table is helping General Motors' engineers simulate snow year round, ensuring heating systems in cars like the 2015 Chevrolet Cruze can quickly and efficiently warm its interior. Packed snow can prevent air from entering the inlet panel at the bottom of the windshield, obstructing the flow of air into the heating system and reducing the amount of air it can push out. This can lead to less efficient warming of the car's interior and windshield defrosting. "The last thing anyone wants to do when it's freezing cold out is scrape their windshield," said Nicholas Jahn, GM Vehicle Thermal Systems engineer. "The testing we perform on the Chevrolet Cruze with the diaper material allows us to maximize the car's heating capabilities." Ironically, Jahn stumbled upon his diaper-based testing method in the middle of summer. During a swim with his daughter, he noticed her diaper multiplied in size when it came into contact with water.

2020 Chevy Trax and Buick Encore spied testing

We just recently saw a little crossover SUV from General Motors being tested, and we weren't positive what brand it belonged to. We narrowed it down to Chevy or GMC, but we're feeling more confident that it's a GMC now, since both the next generation Chevy Trax and Buick Encore subcompact crossover SUVs have been spied testing together. Of the two, the Chevy has the more radically different sheet metal. It ditches the somewhat frumpy, lumpy shape of the current Trax for a body inspired by the bigger Chevy Blazer. The roofline has sharp corners, and the hood is wide and flat. The front fascia, though obscured, shows the most connection to the bigger crossover. It has the same split headlight configuration, and it looks as though the grille takes up a sizable section of the fascia. View 7 Photos The Buick Encore on the other hand looks evolutionary in design. The body still has plenty of curves, and the distinctive, sharply rising window sill are all hallmarks of the current Encore design. The headlights and grille are similar, too, though the grille appears to be slightly updated to fit in with the Enclave and Regal. It's understandable that Buick might want to play it safe with the new Encore, since the model is Buick's best seller, selling about 23,000 units in the last quarter, nearly twice that of the next best performer, the Enclave. Since this is the first time we've seen these little crossovers, we expect it will still be a year or two before we get to see them fully revealed. They will probably continue to use small-displacement turbocharged four-cylinder engines with either front- or all-wheel drive. Related Video:

BMW, Hyundai score big in JD Power's first Tech Experience Index

While automakers are quick to brag about winning a JD Power Initial Quality Study award, the reality, as we've pointed out before, is that these ratings are somewhat misleading, since IQS doesn't necessarily distinguish genuine quality issues. JD Power's new Tech Experience Index aims to solve that problem. The new metric takes the same 90-day approach as IQS but focuses exclusively on technology – collision protection, comfort and convenience, driving assistance, entertainment and connectivity, navigation, and smartphone mirroring. It splits the industry up into just seven segments, based loosely on size, which is why the Chevrolet Camaro is in the same division (mid-size) as Kia Sorento and the Mercedes-Benz GLE-Class is in the same segment as the Hyundai Genesis (mid-size premium). It makes for some screwy bedfellows, to be sure. Still, splitting tech experience away from initial quality should allow customers to make more informed and intelligent decisions when buying new vehicles. In the inaugural study, respondents listed BMW and Hyundai as the big winners, with two segment awards – the 2 Series for small premium and the 4 Series for compact premium, and the Genesis for mid-size premium and Tucson for small segment. The Chevrolet Camaro (midsize), Kia Forte (compact), and Nissan Maxima (large) scored individual wins. Ford also had a surprising hit with the Lincoln MKC, which ranked third in the compact premium segment behind the 4 Series and Lexus IS. This is a coup for the Blue Oval, whose woeful MyFord Touch systems made the brand a victim of the IQS' flaws in the early 2010s. But Ford and other automakers might not want to celebrate just yet. According to JD Power, there's still a lot of room for improvement – navigation systems were the lowest-rated piece of tech in the study. Instead, customers repeatedly saluted collision-avoidance and safety systems, giving the category the best marks of the study and listing blind-spot monitoring and backup cameras as two must-have features – 96 percent of respondents said they wanted those two systems in their next vehicle. But this isn't really a surprise. Implementation of safety systems from brand to brand is similar, and they don't require any input from users, unlike navigation and infotainment systems which are frustratingly deep.