Hybrid Milestone
Tuesday, October 28th, 2008I try to stay away from technical topics here in the blog, but some tech news that came out yesterday is worth mentioning, because it has a really good chance of showing up in your fleet someday soon. Yesterday, in a live webcast from their Atlanta headquarters, UPS announced the purchase of seven International delivery vans powered by Eaton hydrualic hybrid systems. This is remarkable news for a couple of reasons. First, up until now hydraulic hybrid systems were usually seen in the intense stop-and-go world of refuse collection. Second, up until now hydraulic hybrid systems have been largely designed to store and re-use braking energy.
What’s different about the new systems being rolled out by Eaton & Navistar is that hydraulic pressure is built up by the diersel engine, not by braking activity. To quote Eaton’s press release, “The vehicle uses hydraulic pumps and hydraulic storage tanks to capture and store energy, similar to what is done with electric motors and batteries in a hybrid electric vehicle. In this case, the diesel engine is used to periodically recharge pressure in the hydraulic propulsion system. Fuel economy is increased in three ways: vehicle braking energy is recovered that normally is wasted; the engine is operated more efficiently, and the engine can be shut off when stopped or decelerating.” Like I said, pretty technical, and pretty fascinating.
The really exciting news is that the initial test truck has achieved a fuel economy improvement of between 40 and 50 percent, and a 30 percent reduction in emissions. Multiply those improvements by seven, and you’re talking about making a real difference.
Congratulations to UPS, Navistar and Eaton; we need more of this kind of thinking!
