Hybrid parcel

As part of a public-private partnership to increase the commercial availability and use of alternative fuel vehicles, UPS is purchasing hydraulic hybrid vehicles that promise dramatic fuel savings and environmental benefits.

UPS was the only company in its industry asked to road-test the technology two years ago and now becomes the first delivery company to place an order for the hydraulic hybrid vehicles (HHVs).

With a diesel 'series' hydraulic hybrid of the type being purchased by UPS, a high-efficiency diesel engine is combined with a unique hydraulic propulsion system, replacing the conventional drivetrain and transmission.

The vehicle uses hydraulic pumps and hydraulic storage tanks to capture and store energy. For its part, the diesel engine is used to periodically recharge pressure in the hydraulic propulsion system.

Fuel economy is increased in three ways: vehicle braking energy is recovered that normally is wasted; the engine is operated more efficiently; and the engine can be shut off when stopped or decelerating.