Buick LaCrosse eAssist

General Motors announced a new fuel saving technology for the 2012 Buick LaCrosse models, dubbed the eAssist.

This system has a 115V air-cooled lithium-ion battery that works with the car’s 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 eAssist results in a remarkable boost in efficiency as the LaCrosse manages 37 mpg highway and 25 mpg city. Buick says it has no effect on the performance.

2012 buick lacrosse e assist 1 Buick LaCrosse eAssist

The system also enables the Ecotec engine to shut down fuel delivery in certain deceleration conditions, which saves additional fuel. 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 eAssist system’s electric motor-generator is mounted to the engine in place of the alternator to provide both motor assist and electric-generating functions through a new engine belt-drive system.

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