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Video: How it Works – Hydraulic Hybrid Vehicles

Posted on March 20, 2009
Filed Under Corporate Adoption, Education, Hybrid Trucks, Video | Leave a Comment

UPS released this video detailing how its hydraulic hybrid trucks work.

Essentially, the system uses its pressurized hydraulic fluid to motivate a pump that turns the wheels, propelling the vehicle forward. Under braking, the same pump is used to re-pressurize the fluid, recapturing some of the lost energy.

Once it drops below a preset level, the gasoline engine kicks in to drive a second pump, which drives the wheels, while re-pressurizing the system.

What’s interesting about this system is that the gasoline engine doesn’t appear to have a direct connection to the drive wheels, relying wholly on hydraulics to transmit the power.

Of course, it all makes sense when you see it in action.


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