APU takes over for main truck engine, powers cab devices and saves money

Published Thursday, January 01, 2004

What if, as you pulled into a truckstop and set your parking brake, your truck's high-horsepower engine automatically sensed you no longer needed power to the drivetrain, and reduced power except for the cab and sleeper? In its “tuned down” state, the engine ran quieter and used just over a pint of fuel per hour, saving thousands of dollars of fuel per year. Is this something engine manufacturers thought up? “Yes and no,” said Eldon Willis. “The concept is real, but instead of the main engine itself being smart, that job is left to an auxiliary power system ...

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