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Audi is working on a suspension that gets power from bumpy roads

Regenerative brakes aren't new. They're on virtually every hybrid and EV, and they're even starting to pop up on traditional gas-powered cars, like with the i-ELOOP-equipped Mazda6. But even with these systems, cars can get more efficient, and Audi thinks it found yet another source of wasted energy. The source? The suspension. The idea is to turn the kinetic energy that goes into the dampers into usable energy instead of as waste heat. Audi isn't the first auto company to come up with regenerative suspension – nearly three years ago, ZF introduced its GenShock technology, which used a valve attached to traditional, oil-filled hydraulic shocks to recapture kinetic energy from movement caused by bumps in the road. Audi's prototype technology, which it calls eROT, replaces traditional dampers with horizontally oriented electromechanical rotary dampers. eROT is apparently short for electromechanical rotary damper. Neat. In testing, eROT recovered an average of 100 to 150 watts on a typical German road, three watts from a fresh piece of pavement, and 613 watts on a rough stretch of tarmac (wattage is calculated as power over time, so this is actually the rate at which the system harvests energy). The dampers channel that energy to a tiny, 0.5-kWh, 48-volt battery. The prototype is claimed to cut CO2 emissions by three grams per kilometer (4.8 grams per mile), while the company believes a future production version could save up to 0.7 liters of fuel per 100 kilometers of driving. Converting the savings to American miles per gallon isn't easy, so we'll use a practical example. In the US, the Q7's supercharged 3.0-liter V6 returns a combined rating of 21 miles per gallon, which works out to 11.2 liters per 100 kilometers. Apply eROT's 0.7L/100km savings, and the Q7's economy would improve to 10.5L/100km, or 22.4 mpg, a 1.4-mpg improvement. That's not huge, but because math, 0.7L/100km is more dramatic on a more fuel efficient vehicle – taking an A3's 27-mpg combined rating and adding eROT would drive efficiency up 2.4 mpg, for example. There are a few other big benefits beyond fuel and emissions savings – Audi claims eROT provides a more comfortable ride than traditional active suspensions, because engineers can tune the compression and rebound strokes independently of each other. Beyond that, the horizontally oriented rear suspension geometry means more cargo space, since the dampers don't poke up into the cabin like they normally do.

Junkyard Gem: 1987 Audi 5000

The third-generation Audi 100 introduced for the 1983 model year was sold as the Audi 5000 in the United States. Sales of this high-end German sedan went pretty well ... until 60 Minutes ran a piece called "Out of Control" in late 1986, convincing many viewers that the 5000 was murderously defective. Yes, it was the original Unintended Acceleration debacle, decades before the one that cost Toyota big yen, and it slaughtered American Audi sales. Today's Junkyard Gem had the misfortune to be sitting in an Audi showroom while the echoes of the argle-bargle over the 5000 controversy still reverberated, its price dropping while potential buyers headed into the arms of nearby Mercedes-Benz and BMW dealers. Still, someone bought this car, which would have been a great Colorado winter machine with its 5-speed and Quattro all-wheel-drive system, and it ended up racking up more miles than 98 percent of cars sold in 1987. The presence of an ignition key in a junkyard car usually indicates that it was a trade-in or insurance total. A high-mile, 29-year-old Audi isn't worth much at auction, so this one ended up here. All the automatic-equipped 5000s got scary warning stickers on the shifters, among other recall-mandated changes, and Audi ended up using the European-market 100 name on these cars starting in the 1989 model year . Related Video: Featured Gallery Junked 1987 Audi 5000 Quattro View 18 Photos Auto News Audi unintended acceleration

Win an electric car and celebrate Earth Day

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