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hydraulic pressure in the accumulator. The traction motor must supply all the torque required to propel the vehicle, meaning maximum acceleration performance is available with the engine running or stopped. Its main disadvantage is in steady-state cruising, where the double conversion of energy introduces additional losses.
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In a series hydraulic hybrid vehicle, the pump/motor directly connects to the driveshaft, or the in-wheel motors provide driving torque directly to the wheel. The internal combustion engine is only connected to a pump, and is set to operate in its most efficient power range to maintain the optimal
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Technical challenges with hydraulic hybrid vehicles include noise, size, and complexity. Technical advances, such as very Large
Diameter, Flat Format (LDFF) hydraulic motors which produce very high torque in limited drive line space, enable heavy vehicles like refuse trucks and city buses to be
183:. The role of pump/motor is to provide assistance to the engine during acceleration and recapture energy under braking that would otherwise be lost as heat in the conventional brakes. As with electric hybrids, the pump/motor may or may not be able to drive the vehicle alone with the engine off.
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Hydraulic hybrids recover, or harvest, the vehicle's kinetic energy during braking and decelerating significantly more efficiently than electric systems; hydraulic hybrids can recover up to 70–80% of the vehicle's kinetic energy compared to 55% for electric hybrids.
49:. They capture and reuse 70–80% of the vehicle's kinetic braking/decelerating energy and potential descending energy compared to 55% for electric hybrids. For trucks and buses, this can also be less expensive than electric systems, due to the price of
122:. When the vehicle accelerates, this pressurized working fluid provides energy to the pump/motor to power the vehicle. For a parallel hybrid system, fuel efficiency gains and emissions reductions result from reduced
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required for the latter. Hydraulic hybrid vehicle systems can also weigh less than electric systems, due to the high weight of the batteries. This can lead to a lower impact on payload capacity, especially for heavy
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The EPA calculated for this test vehicle, the hybrid technology added a cost of about US$ 7,000 over a comparable conventional truck, while the lifetime fuel savings over 20 years were estimated above $ 50,000.
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claims that in laboratory tests, the city fuel economy of an urban delivery truck was 60–70% increased miles per gallon versus a similar, conventionally powered internal combustion truck. The CO
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fitted with hydraulic hybrid systems. Sophisticated control software results in hydraulic hybrid vehicles which are safe, driveable, reliable and efficient.
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In a parallel hydraulic hybrid vehicles, the pump/motor is typically installed between the engine and gearbox, or between the gearbox and differential
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that make the pressure tanks somewhat expensive, but the price of carbon fiber has been forecasted to drop as economies of scale and manufacturing
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393:"Hydraulic Hybrid Research| Clean Automotive Technology | Transportation and Air Quality| US EPA"
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emissions of the same demonstration delivery truck were claimed to be over 40% lower, and the
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Hydraulic hybrid vehicle systems consists of four main components: the working fluid,
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368:"ORNL seeking U.S. manufacturers to license low-cost carbon fiber process | ORNL"
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521:"Eaton To Develop Digital Hydraulic Hybrid Drive System For U.S. Army Vehicles"
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Emissions
Testing Results: Hydraulic Hybrid Delivers Major Emissions Reductions
461:, United States Environmental Protection Agency Hydraulic Hybrid Research Page
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because no complicated or expensive materials (such as those required for
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In some cases hydraulic hybrid systems may be more cost-effective than
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production were also much lower (50% and 60% respectively).
467:, United States Environmental Protection Agency, March 2004
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devices such as water pumps, hydraulic lifts, and winches.
102:. In hydraulic hybrid system, the pump/motor extracts the
498:, Eaton Corporation (Requires QuickTime plug-in to view)
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176:, there are several possible drivetrain architectures.
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Reduced cost, complexity, and weight for additional
118:. Working fluid is thus pressurized, which leads to
532:IFPE High Efficiency Hydraulic Hybrid Drive System
298:"What Learned - Regenerative braking efficiency"
465:Hydraulic Hybrid Technology - A Proven Approach
215:can lower the cost of manufacturing the tanks.
126:on the internal combustion engine due to the
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449:Hydraulic Hybrid Fleet Vehicle Testing
508:EPA Innovates Hydraulic Hybrid System
94:of the vehicle is used to charge the
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459:Hydraulic Hybrid Vehicles - Research
453:National Renewable Energy Laboratory
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527:(Press release). December 21, 2007.
496:Hydraulic Launch Assist (HLA) Video
110:to pump the working fluid from the
345:, Jamie Page Deaton, HowStuffWorks
162:Types of hydraulic hybrid vehicles
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502:https://www.innas.com/hydrid.html
445:Fleet Test and Evaluation Project
471:The ERS (Energy Recovery System)
211:is reduced by 60% according to
130:provided by the hybrid system.
484:What are mechanical batteries?
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213:Oak Ridge National Laboratory
86:to power the vehicle. During
191:Advantages and disadvantages
417:"Hydraulic Hybrid Vehicles"
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514:Hydraulic hybrid retrofits
343:How Hydraulic Hybrids Work
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78:, energy is stored in the
39:internal combustion engine
282:Hydraulic Hybrid Vehicles
197:electrical hybrid systems
168:Hybrid vehicle drivetrain
41:(ICE), to achieve better
31:Hydraulic hybrid vehicles
516:KersTech Vehicle Systems
82:and is delivered to the
550:Automotive technologies
355:Series Hybrid Hydraulic
251:Hybrid electric vehicle
245:Hydraulic Launch Assist
174:electric hybrid system
76:electric hybrid system
62:Principle of operation
27:Type of hybrid vehicle
240:Hydraulic accumulator
256:Regenerative braking
100:regenerative braking
492:, Lightning Hybrids
486:, Lightning Hybrids
480:, Lightning Hybrids
357:, Eaton Corporation
476:2016-11-04 at the
329:2009-10-24 at the
152:particulate matter
45:and reductions in
560:Hybrid powertrain
525:Eaton Corporation
209:energy efficiency
47:harmful emissions
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544:Categories
504:, Innas BV
427:2018-11-24
402:2018-11-24
377:2018-11-24
333:, Innas BV
307:2018-11-24
262:References
391:EPA, US.
201:batteries
172:Like the
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474:Archived
327:Archived
284:, US EPA
234:See also
114:to the
108:braking
106:during
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80:battery
421:US EPA
140:US EPA
128:torque
247:(HLA)
150:and
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