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Hydraulic horsepower. .


What It is

A regenerative drive system based around a hydraulic pump/motor and a pair of accumulators. Eaton Hydraulics has been down this road with its Hydraulic Launch Assist Hydraulic launch assist is a type of regenerative braking system introduced by Ford Motor Company and Eaton Corporation. This type of regenerative braking utilizes the transfer of kinetic energy into potential energy (compressed liquid) via hydraulics while breaking.  (AD&P, April 2002, p. 28), but Permo-Drive Technologies, Ltd. (Ballina, Australia) is working with the U.S. Army, the largest truck fleet operator in the world... and garbage truck fleets.

What It Does

A reversible pump/motor is attached to the driveshaft via a clutch, and connects to a pair of accumulators (one high- and one low-pressure) filled with a combination of nitrogen gas and hydraulic fluid hydraulic fluid

toxic because of its high content of industrial triaryl phosphate.
. Under braking, the hydraulic fluid flows through the pump/motor unit into the high-pressure tank. It is released back through the driveshaft on acceleration. In military applications, the Permo-Drive unit can be used to accelerate the vehicle with the engine off, which reduces its noise and heat signature.

Why People Are Interested

According to according to
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1. As stated or indicated by; on the authority of: according to historians.

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 U.S. Army figures, 70% of the bulk tonnage required to sustain a military force in the battlefield is fuel. That's about 600,000 gallons of fuel/day at an air freight air freight nflete m por avión

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 cost of $600/gallon. Testing of a Perm 0-Drive-modified Army FMTV FMTV Family of Medium Tactical Vehicles
FMTV Frequency Modulation Television
 (Family of Medium Tactical Vehicles The Family of Medium Tactical Vehicles (FMTV) is a series of vehicles manufactured by BAE Systems Mobility & Protection Systems (M&PS) (formerly the Tactical Vehicle Systems Division of Armor Holdings Aerospace and Defense Group, originally Tactical Vehicle Systems, LP, a ) at the military's Aberdeen Proving Grounds in Maryland shows a 26% to 33% improvement in fuel economy, a 7.5-second reduction in 0-60 mph times, and a 450-foot reduction in stopping distance from 32 mph when fully loaded. Permo-Drive says spare parts Spare parts, also referred to as Service Parts is a term used to indicate extra parts available and in proximity to the mechanical item, such as a automobile, boat, engine, for which they might be used.

Spare parts are also called “spares.
 are readily available, the components are robust, the technology is mature, and the units can be retrofit to existing vehicles. The technology also appeals to garbage truck fleets who perform $10,000 brake overhauls on each truck as often as once a month. PermoDrive says it can extend this interval to once every six to eight months.

What's Next

A system for Class 6 trucks is under development. It has a target weight of 330 lbs., produces 340 hp and 995 lb/ft of torque, operates at 5000 lb/in.2, and is 18-in, long by 9.5-in, wide by 12in. high. Prototypes will be ready in the fourth quarter of 2003, with production scheduled for the second quarter of 2005.

Contact Info

Check it out at: www.permo-drive.com
COPYRIGHT 2003 Gardner Publications, Inc.
No portion of this article can be reproduced without the express written permission from the copyright holder.
Copyright 2003, Gale Group. All rights reserved. Gale Group is a Thomson Corporation Company.

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Article Details
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Author:Sawyer, Christopher A.
Publication:Automotive Design & Production
Geographic Code:8AUST
Date:Jun 1, 2003
Words:372
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