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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.

Even if GM does close all 5 of those plants, it'll still have too many

DETROIT — General Motors' monumental announcement on Monday that it will close three car assembly plants and two powertrain plants in North America and slash its workforce will only partially close the gap between capacity and demand for the automaker's sedans, according to a Reuters analysis of industry production and capacity data. Sales of traditional passenger cars in North America have been declining for the past six years and are still withering. After GM ends production next year at factories in Michigan, Ohio and Ontario, it will still have four U.S. passenger-car plants — all operating at less than 50 percent of rated capacity, according to figures supplied by LMC Automotive. In comparison, Detroit-based rivals Ford and Fiat Chrysler Automobiles will have one car plant each in North America after 2019. The Detroit Three are facing rapidly dwindling demand for traditional passenger cars from U.S. consumers, many of whom have shifted to crossovers and trucks. Passenger cars accounted for 48 percent of retail light-vehicle sales in the United States in 2014, according to market researchers at J.D. Power and Associates. This year, sedans will account for less than a third of light vehicle sales. That shift in turn has left most North American car plants operating far below their rated capacities, while many SUV and truck plants are running on overtime. The collapse in passenger-car demand is a challenge for nearly all automakers in the United States, including Japan's Toyota and Honda, which have the top-selling models in the compact and midsize car segments. Toyota executives said last month they are evaluating the company's U.S. model lineup. But Toyota also plans to build compact Corolla sedans at a new $1.6 billion factory it is building in Alabama with partner Mazda. The obstacles facing GM in its plans to close more auto factories became apparent on Tuesday as U.S. President Donald Trump threatened to block payment of government electric vehicle subsidies to GM. While it is not certain that Trump unilaterally has the power to do that, he made it clear he intends to use his office to pressure the company to keep open a small car plant in Ohio that GM says will stop building vehicles in March.

GM's European Opel division may eventually go all-electric

General Motors' Opel division in Europe may transform itself into an all-electric vehicle maker by 2030. Granted, a lot can happen between now and then, including a potential buyout by French automaker PSA Group. Regardless, Opel appears to view its electric future beyond the Ampera-e, which is the sister vehicle to the Chevrolet Bolt, and more like Tesla. Opel CEO Karl-Thomas Neumann indicated that focusing on electric drivetrains would be a superior strategy to expanding its EV technology while pushing forward with conventional drivetrains, says Automotive News Europe, citing comments Neumann made to German publication Manager Magazin. General Motors could make the decision to move towards an all-electric vehicle line for Opel as soon as May. Of course, that depends on whether Opel is bought out by PSA, the parent country to Peugeot and Citroen. PSA is in talks to buy General Motors' Opel and Vauxhall divisions, though government and labor representatives in Germany have expressed concerns over potential job losses from the proposed buyout, Reuters says. Regardless, GM has hinted at expanding its electric-vehicle line far beyond the Bolt, which has a 238-mile single-charge range and debuted late last year. Mary Barra, in an interview with CNET, said the Bolt's all-electric platform could be applied to a "huge range of vehicles," though wasn't specific about additional EV models. Opel first showed off its Ampera-e at the Paris Motor Show last fall. The name of the model raised some eyebrows because the Ampera badge had been previously used by Opel for the sister version of the Chevrolet Volt extended-range plug-in. Either way, Opel is looking to take on Renault for electric-vehicle sales supremacy across the Pond. Related Video: