![]() It is designed to be quiet from the cabin. An electric fan cools the power pack, drawing air from a vent located in the package tray, behind the rear seat. Trunk space is slightly reduced from 2011 models with the four-cylinder/six-speed powertrain, but still offers 10.9 cubic feet (307 liters) of storage. It still allows rear access to the trunk via the split-folding rear seat – unlike other hybrid competitors. It is located in a compartment between the rear seat and trunk and it is surprisingly compact and lightweight, weighing only about 65 pounds (29 kg). The e Assist power pack contains the lithium-ion battery pack, the integrated power inverter and 12V power supply. “It’s really an extension of the conventional internal combustion engine, not a replacement for it.” “The battery system is designed to provide power assistance to the internal combustion engine, rather than storing energy for all-electric propulsion,” said Poulos. Then, as the vehicle comes to a stop, the motor-generator unit spins the engine, bringing it to a smooth stop – properly positioned for a smooth restart. While in fuel shut-off mode, the motor-generator unit continues spinning along with the engine to provide immediate and smooth take-off power when the driver presses on the accelerator. The system also enables the Ecotec engine to shut down fuel delivery in certain deceleration conditions, which saves additional fuel. This power capability enables the battery to capture energy during regenerative braking for improved fuel economy. The e Assist system’s 115V air-cooled lithium-ion battery bolsters the 2.4L Ecotec four-cylinder engine with approximately 11 kW (15 horsepower) of electric power assist during heavy acceleration and 15 kW of regenerative braking power. The engine start-stop and fuel shut-off during deceleration features add to the fuel savings.” “Providing electric boost to the powertrain system during heavy acceleration and grade driving helps the transmission operate more efficiently. “The e Assist system integrates regenerative braking with the latest lithium-ion battery technology, for significant fuel-efficiency gains customers will enjoy,” said Steve Poulos, global chief engineer of the e Assist system. Visit the 2012 LaCrosse eAssist product page for more information.ĭETROIT – The 2012 Buick LaCrosse with e Assist™ delivers an estimated 36 mpg on the highway, thanks to smart technology that doesn’t require compromising the ride, performance or costs that typically accompany hybrids.This release contains final EPA-certified fuel economy numbers for the 2012 Buick LaCrosse with eAssist. ![]()
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