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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.

Audi Quattro concept production hopes still alive, could be more radical

Remember the gestation period of the Lexus LFA, the one that, in automotive time, took so long that its origins could have been carbon dated? We feel like it's deja vu all over again, as Yogi Berra would have said, this time featuring the Audi Quattro and Audi Sport Quattro. It was 2010 when our cameras first glimpsed the Audi Quattro Concept (pictured right) at the Paris Motor Show, and we tasted its turbocharged 2.5-liter, five-cylinder powerplant not long after. Last year we met the hybrid, 700-horsepower Audi Sport Quattro concept at the Frankfurt Motor Show, but we got no closer to finding out if there'd ever be a version we could buy. A report in Autocar keeps the flame of hope burning, quoting Audi design chief Marc Lichte at the LA Auto Show saying, "We are working on Quattro, it is still alive." Lichte went on to say, however, that the next imagining is "more extreme" than those we've seen, and, "There will be surprises." Those words alone are a surprise. The last we heard about the Quattro revival was Audi boss Ulrich Hackenberg saying he wanted a more accessible homage to the original, and we don't know how "more extreme" jives with that. Seeing that Audi is serious about the idea, at least, we shouldn't have to wait long to find out. Just don't get your hopes up about its affordability yet.

Audi's new 1,000-hp hybrid pulls like a freight train

Audi's latest plug-in hybrid handles like it's on rails, and pulls like a freight train. That's because it's a train, and literally rides on rails. The vehicle in question is a locomotive which the German automaker developed for its main factory in Ingolstadt incorporates over 11 miles of railroad tracks, along which are transported parts and completed vehicles to be moved around the site. To carry out those duties, Audi teamed up with French manufacturer Alston to deploy a new hybrid locomotive on premises. The locomotive features a plug-in hybrid propulsion systems capable of running on electric power alone for two hours at a time, and can be plugged in to recharge during down-time. The upshot is that it not only pollutes less overall, but can be run inside warehouses more safely. When the power runs out, the electrical system is backed up by a diesel engine. Audi reports that 15 trains arrive at the factory every day. It employs 17 locomotive drivers on site. And each locomotive runs for 3,800 hours each year. Whether we can take Audi at its word when it comes to diesel emissions or not, the company claims that the new hybrid locomotive cuts its carbon emissions by half, taking 60 tons of CO2 out of the atmosphere each year. 10/30/15 Ingolstadt Hybrid locomotive at Audi plant in Ingolstadt This Audi drives on rails: A 1,000 horsepower plug in hybrid locomotive manufactured by Alstom replaces the plant locomotives previously used at the Audi plant in Ingolstadt as of today. This means that components and finished Audi models will now reach the plant's loading stations in a more climate friendly way. "Our goal is all-round sustainable logistics," stated Johann Schmid, head of the Audi plant railway in Ingolstadt. "The new railway technology allows more economical, energy-efficient and low-emission rail transport. In connection with the latest chassis technology, the plug-in-hybrid locomotive sets new standards in shunting and rail transport." The complete automobile plant in Ingolstadt includes 18 kilometers of railways. Every day, 15 goods trains arrive at Ingolstadt North railway station for Audi – loaded with pressed parts, engines and transmissions, as well as cars from other Audi sites that are ready for delivery to customers. And cars produced in Ingolstadt also start their journey to customers by rail. 17 Audi locomotive drivers work at the plant railway. One of their tasks is to allocate the wagons to the various plant buildings.