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{{short description|Hydraulic hybrid regenerative braking system}} |
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'''Hydraulic Launch Assist''' ('''HLA''') is the name of a [[hydraulic hybrid]] [[regenerative braking]] system for land vehicles produced by the [[Eaton Corporation]].<ref>{{Citation |
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It also is referred to as the HLA (reg.) system.<ref> |
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|title = Hydraulic Launch Assist (HLA) |
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{{Citation |
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|website = [[Eaton Corporation]] |
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|url = https://www.eaton.com/SEAsia/ProductsSolutions/Hydraulics/ProductsServices/HydraulicLaunchAssist/index.htm |
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| title= Hydraulic Launch Assist<sup> <span style="font-variant:small-caps">TM</span></sup> (HLA<sup> <span style="font-variant:small-caps">TM</span></sup>) |
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| newspaper=Website |
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|archive-date = 12 May 2008 |
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| date=November 13, 2007 |
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|url-status = live |
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| ⚫ | |||
|access-date = 12 August 2019 |
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}}</ref> |
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== Background== |
== Background== |
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The HLA system recycles energy by converting [[kinetic energy]] into [[potential energy]] during deceleration via [[hydraulics]], storing the energy at high pressure in an accumulator filled with nitrogen gas. The energy is then returned to the vehicle during subsequent acceleration thereby reducing the amount of work done by the internal combustion engine. This system provides considerable increase in vehicle productivity while reducing fuel consumption in stop-and-go use profiles like refuse vehicles and other heavy duty vehicles.<ref> |
The HLA system recycles energy by converting [[kinetic energy]] into [[potential energy]] during deceleration ''via'' [[hydraulics]], storing the energy at high pressure in an [[Hydraulic accumulator|accumulator]] filled with [[nitrogen gas]]. The energy is then returned to the vehicle during subsequent acceleration thereby reducing the amount of work done by the [[internal combustion engine]]. This system provides considerable increase in vehicle productivity while reducing [[fuel consumption]] in stop-and-go use profiles like [[Garbage truck|refuse vehicles]] and other heavy duty vehicles.<ref> |
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{{Citation |
{{Citation |
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|last = Wiebusch |
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|url = http://www.designnews.com/article/CA220671.html |
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|url-status = dead |
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|archiveurl = https://web.archive.org/web/20070930155816/http://www.designnews.com/article/CA220671.html |
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|archivedate = September 30, 2007 |
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}}</ref> |
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==Parallel vs. |
==Parallel vs. series hybrids== |
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The HLA system is a |
The HLA system is called a parallel hydraulic hybrid. In parallel systems the original vehicle [[Powertrain|drive-line]] remains, allowing the vehicle to operate normally when the HLA system is disengaged. When the HLA is engaged, energy is captured during deceleration and released during acceleration, in contrast to series hydraulic hybrid systems which replace the entire traditional drive-line to provide power transmission in addition to regenerative braking. |
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==Hydraulic vs. |
==Hydraulic vs. electric hybrids== |
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Hydraulic hybrids are said to be power dense, while electric hybrids are energy dense. This |
Hydraulic hybrids are said to be [[Power density|power dense]], while electric hybrids are [[Energy density|energy dense]]. This means that [[Hybrid electric vehicle|electric hybrids]], while able to deliver large amounts of energy over long periods of time are limited by the rate at which the [[chemical energy]] in the batteries is converted to [[mechanical energy]] and ''{{linktext|vice versa}}''. This is largely governed by [[Reaction rate|reaction rates]] in the [[Battery (electricity)|battery]] and [[Ampacity|current ratings]] of associated components. Hydraulic hybrids on the other hand are capable of transferring energy at a much higher rate, but are limited by the amount of energy that can be stored. For this reason, hydraulic hybrids lend themselves well to stop-and-go applications and heavy vehicles. |
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==Applications== |
==Applications== |
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===Concept |
===Concept vehicles=== |
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[[Ford Motor Company]] included the HLA system in their 2002 F-350 Tonka truck concept vehicle |
[[Ford Motor Company]] included the HLA system in their 2002 F-350 [[Tonka]] truck [[Concept car|concept vehicle]], reported to have lower emissions and better fuel economy than any V-8 diesel truck engine of the time, with HLA designed to eventually improve fuel economy by 25%-35% in heavy truck city driving.<ref>{{cite web |url=https://newatlas.com/go/1194/ |title=Ford Tonka Truck |website=New Atlas|date=4 June 2004 |author=Mike Hanlon}}</ref> |
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===Shuttle |
===Shuttle bus=== |
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Eaton, Ford, the US Army, and IMPACT Engineering, Inc. (of [[Kent, Washington]]), built an E-450 [[Public transport bus service#Specialist services|shuttle bus]] as part of the Army's HAMMER (Hydraulic Hybrid Advanced Materials Multifuel Engine Research) project.<ref> |
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{{Citation |
{{Citation |
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| last=Siuru |
| last=Siuru |
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| title=Off to a quick start: Eaton's Corp.'s Hydraulic launch assist system demonstrated in shuttle bus, delivery van applications |
| title=Off to a quick start: Eaton's Corp.'s Hydraulic launch assist system demonstrated in shuttle bus, delivery van applications |
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===Refuse=== |
===Refuse=== |
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Eaton has been awarded the Texas government’s New Technology Research and Development grant to build 12 |
Eaton has been awarded the Texas government’s [[Climate_change_in_Texas#Grants|New Technology Research and Development]] grant to build 12 refuse vehicles with HLA systems.<ref> |
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{{Citation |
{{Citation |
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| last=[[Eaton Corporation]] |
| last=[[Eaton Corporation]] |
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| title= |
| title= Eaton's Greenhouse Gas Emission-Reducing Technologies To Benefit Texas Companies In 2007 Through State Grant For Environmentally Friendly Trucks |
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| newspaper=Press Release |
| newspaper=Press Release |
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| date=January 3, 2007 |
| date=January 3, 2007 |
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| url= http://www.eaton.com/EatonCom/OurCompany/NewsandEvents/NewsList/CT_068498}}</ref> |
| url= http://www.eaton.com/EatonCom/OurCompany/NewsandEvents/NewsList/CT_068498}}</ref> |
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[[Peterbilt Motors]] has designed a Model 320 chassis that incorporates the HLA system,<ref>{{Citation|last=[[Peterbilt Motors]] |title= |
[[Peterbilt Motors]] has designed a Model 320 chassis that incorporates the HLA system,<ref>{{Citation|last=[[Peterbilt Motors]] |title=PETERBILT'S HYBRID STRATEGY UTILIZES ADVANCED TECHNOLOGIES IN DEVELOPING FULL RANGE OF PRODUCT SOLUTIONS |newspaper=Press Release |date=March 21, 2007 |url=http://www.peterbilt.com/index_new_mor.asp?file=2100 |url-status=dead |archiveurl=https://web.archive.org/web/20071118012921/http://www.peterbilt.com/index_new_mor.asp?file=2100 |archivedate=November 18, 2007 }}</ref> which was featured on the cover of the December 13, 2007, issue of ''[[Machine Design]]''.<ref> |
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{{Citation |
{{Citation |
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| last=Bohlman, Davis |
| last=Bohlman, Davis |
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Latest revision as of 19:51, 16 February 2024
Hydraulic Launch Assist (HLA) is the name of a hydraulic hybrid regenerative braking system for land vehicles produced by the Eaton Corporation.[1]
Background
[edit]The HLA system recycles energy by converting kinetic energy into potential energy during deceleration via hydraulics, storing the energy at high pressure in an accumulator filled with nitrogen gas. The energy is then returned to the vehicle during subsequent acceleration thereby reducing the amount of work done by the internal combustion engine. This system provides considerable increase in vehicle productivity while reducing fuel consumption in stop-and-go use profiles like refuse vehicles and other heavy duty vehicles.[2]
Parallel vs. series hybrids
[edit]The HLA system is called a parallel hydraulic hybrid. In parallel systems the original vehicle drive-line remains, allowing the vehicle to operate normally when the HLA system is disengaged. When the HLA is engaged, energy is captured during deceleration and released during acceleration, in contrast to series hydraulic hybrid systems which replace the entire traditional drive-line to provide power transmission in addition to regenerative braking.
Hydraulic vs. electric hybrids
[edit]Hydraulic hybrids are said to be power dense, while electric hybrids are energy dense. This means that electric hybrids, while able to deliver large amounts of energy over long periods of time are limited by the rate at which the chemical energy in the batteries is converted to mechanical energy and vice versa. This is largely governed by reaction rates in the battery and current ratings of associated components. Hydraulic hybrids on the other hand are capable of transferring energy at a much higher rate, but are limited by the amount of energy that can be stored. For this reason, hydraulic hybrids lend themselves well to stop-and-go applications and heavy vehicles.
Applications
[edit]Concept vehicles
[edit]Ford Motor Company included the HLA system in their 2002 F-350 Tonka truck concept vehicle, reported to have lower emissions and better fuel economy than any V-8 diesel truck engine of the time, with HLA designed to eventually improve fuel economy by 25%-35% in heavy truck city driving.[3]
Shuttle bus
[edit]Eaton, Ford, the US Army, and IMPACT Engineering, Inc. (of Kent, Washington), built an E-450 shuttle bus as part of the Army's HAMMER (Hydraulic Hybrid Advanced Materials Multifuel Engine Research) project.[4]
Refuse
[edit]Eaton has been awarded the Texas government’s New Technology Research and Development grant to build 12 refuse vehicles with HLA systems.[5]
Peterbilt Motors has designed a Model 320 chassis that incorporates the HLA system,[6] which was featured on the cover of the December 13, 2007, issue of Machine Design.[7]
References
[edit]- ^ "Hydraulic Launch Assist (HLA)", Eaton Corporation, archived from the original on 12 May 2008, retrieved 12 August 2019
- ^ Wiebusch (June 17, 2002), "Hydraulic regenerative braking improves large-truck fuel economy", Design News, archived from the original on September 30, 2007
- ^ Mike Hanlon (4 June 2004). "Ford Tonka Truck". New Atlas.
- ^ Siuru (April 2007), "Off to a quick start: Eaton's Corp.'s Hydraulic launch assist system demonstrated in shuttle bus, delivery van applications", Diesel Progress North American Edition
- ^ Eaton Corporation (January 3, 2007), "Eaton's Greenhouse Gas Emission-Reducing Technologies To Benefit Texas Companies In 2007 Through State Grant For Environmentally Friendly Trucks", Press Release
- ^ Peterbilt Motors (March 21, 2007), "PETERBILT'S HYBRID STRATEGY UTILIZES ADVANCED TECHNOLOGIES IN DEVELOPING FULL RANGE OF PRODUCT SOLUTIONS", Press Release, archived from the original on November 18, 2007
- ^ Bohlman, Davis (December 13, 2007), "HYDRAULIC HYBRIDS ARE PICKING UP", Machine Design