KALAMAZOO, Mich. … Once only passable by foot or horseback, visitors to Yosemite National Park now can enjoy the pristine surroundings onboard new low-emission, fuel-friendly vehicles powered by Eaton’s hybrid electric systems. Eaton Corporation, a diversified industrial manufacturer, worked with the U.S. General Services Administration and Delaware North Companies Parks and Resorts, which handles the majority of the park’s transportation needs, in delivering four new Class 8 tractors with the Eaton systems. An additional seven vehicles – 37-passenger shuttle buses – are on order and awaiting delivery.
As a result, more than 4 million visitors per year are now enjoying cleaner air and reduced emissions throughout the park’s 760,000 acres in the Sierra Nevada mountain chain in central California.
“The low-speed, low-mileage and stop-and-go duty cycles at Yosemite provide the perfect operating conditions for a hybrid truck,” said Kevin Snow, chief engineer for hybrid applications at Eaton. “On top of that, the environmental and fuel consumption improvements are going to be quite substantial.”
Dan Anthonijsz, village garage manager at Yosemite for Delaware North Companies, agrees.
“We are definitely realizing fuel consumption reductions, currently averaging about 6.7 miles per gallon with the tram tractors,” noted Anthonijsz. “That’s a huge improvement over the one mile to the gallon that we were getting with the propane trucks that the new vehicles replaced.
“Also with the new vehicle, you don’t even see anything coming out of the exhaust pipes. It is a huge improvement for the environment.”
In addition, Eaton worked with park officials to install a new engine brake on a tow truck, also with an Eaton hybrid electric system, to ensure the regenerative braking function was operating properly. Regenerative braking allows the hybrid system to recover power normally lost during braking and stores the energy in batteries to provide engine-off power take off capabilities.
Eaton has published a case study on the Yosemite purchases that is available for download at eaton.com/roadranger. Search for publication number TRSL2517.
The hybrid systems used on all of the Yosemite vehicles employ parallel, diesel-electric hybrid architecture. It incorporates an electric motor/generator between the output of an automated clutch and input of the transmission. The system recovers energy normally lost during braking and stores the energy in batteries. When electric torque is blended with engine torque, the stored energy is used to improve fuel economy and vehicle performance and is ideal for stop-and-go applications.
Eaton systems have collectively accumulated more than 300 million miles of service, reducing fuel consumption by eight million gallons of diesel fuel and CO2 emissions by more than 80,000 metric tons. At the time they were evaluating solutions, more than 6,000 of Eaton’s hybrid systems were in use today on city buses, school buses, package delivery trucks, beverage delivery trucks, refrigerated delivery trucks, refuse and recycling trucks, utility vehicles and other commercial applications.
All Eaton products are backed by the Roadranger network, which includes more than 200 drivetrain professionals throughout North America. For more information, visit www.eaton.com/roadranger, where the latest product information is available, as well as service, parts and training assistance, 24 hours a day. Experts are available in the Roadranger Call Center by dialing 1-800-826-HELP (4357) in the U.S. and Canada. In Mexico, dial 01-800-826-4357.
Eaton Corporation is a diversified power management company with more than 100 years of experience providing energy-efficient solutions that help our customers effectively manage electrical, hydraulic and mechanical power. With 2011 sales of $16.0 billion, Eaton is a global technology leader in electrical components and systems for power quality, distribution and control; hydraulics components, systems and services for industrial and mobile equipment; aerospace fuel, hydraulics and pneumatic systems for commercial and military use; and truck and automotive drivetrain and powertrain systems for performance, fuel economy and safety. Eaton has approximately 72,000 employees and sells products to customers in more than 150 countries. For more information, visit www.eaton.com.