Hydraulic Accumulator Technology Boosts Transit Bus Fuel Economy

1983 ◽  
Author(s):  
Archie M. Riviera
Keyword(s):  
Fuel Economy ◽  
Hydraulic Accumulator ◽  
Transit Bus

scholarly journals Numerical analyses of a hydraulic hybrid powertrain system for a transit bus

2020 ◽  
Vol 24 (1 Part A) ◽  
pp. 159-170
Author(s):  
Marko Kitanovic ◽  
Slobodan Popovic ◽  
Nenad Miljic ◽  
Predrag Mrdja
Keyword(s):  
Dynamic Programming ◽  
Fuel Economy ◽  
Model Parameters ◽  
Hybrid Powertrain ◽  
Hydraulic Hybrid ◽  
Powertrain System ◽  
Improvement Potential ◽  
Fuel Economy Improvement ◽  
Hydraulic Accumulator ◽  
Transit Bus

A dynamic programming optimization algorithm has been applied on a transit bus model in MATLAB in order to assess the fuel economy improvement potential by implementing a hydraulic hybrid powertrain system. The numerical model parameters have been calibrated using experimental data obtained on a Belgrade?s public transport bus. This experiment also provided the representative driving cycle on which to conduct simulation analyses. Various functional parameters of a hydraulic hybrid system have been evaluated for obtaining the best possible fuel economy. Dynamic programming optimization runs have been completed for various hydraulic accumulator sizes, preload values and accumulator foam quantities. It has been shown that a fuel economy improvement of 28% can be achieved by implementing such a system.

Effects of Drive-Train Hybridization on Fuel Economy and Dynamic Performance of a Series Hybrid Electric Transit Bus

2008 ◽  
Author(s):  
Samaneh Haddadi ◽  
Vahid Esfahanian ◽  
Hassan Nehzati ◽  
Farhad Sangtarash ◽  
Arash Akhgari
Keyword(s):  
Fuel Economy ◽  
Dynamic Performance ◽  
Drive Train ◽  
Hybrid Electric ◽  
Transit Bus

scholarly journals Modelling and experimental validation of the performance of a digital displacement® hydraulic hybrid truck

2021 ◽  
pp. 095440702110261
Author(s):  
William JB Midgley ◽  
Daniel Abrahams ◽  
Colin P Garner ◽  
Niall Caldwell
Keyword(s):  
Mathematical Model ◽  
Hybrid System ◽  
Fuel Economy ◽  
Experimental Validation ◽  
Vehicle Model ◽  
Drive Cycle ◽  
Hydraulic Hybrid ◽  
Fuel Economy Improvement ◽  
Foam Filled ◽  
Hydraulic Accumulator

The development, modelling and testing of a novel, fuel-efficient hydraulic hybrid light truck is reported. The vehicle used a Digital Displacement® pump/motor and a foam-filled hydraulic accumulator in parallel with the existing drivetrain to recover energy from vehicle braking and use this during acceleration. The pump/motor was also used to reduce gear-shift times. The paper describes the development of a mathematical vehicle model and the validation of this model against an extensive testing regime. In testing, the system improved the fuel economy of the vehicle by 23.5% over the JE05 midtown drive cycle. The validated mathematical model was then optimised and used to determine the maximum fuel economy improvement over the diesel baseline vehicle for two representative cycles (JE05 midtown and WLTP). It was found that the hybrid system can improve the fuel economy by 24%–43%, depending on the drive cycle. When this was combined with engine stop-start, the system improved the fuel economy of the vehicle by 29%–95%, depending on the drive cycle.

Impact of Auxiliary Loads on Fuel Economy and Emissions in Transit Bus Applications

2012 ◽  
Author(s):  
Rachel L. Muncrief ◽  
Miguel Cruz ◽  
Henry Ng ◽  
Michael Harold
Keyword(s):  
Fuel Economy ◽  
In Transit ◽  
Transit Bus

Microstructure of an extruded rapidly solidified Al-8Fe-2Mo alloy

1986 ◽  
Vol 44 ◽  
pp. 548-549
Author(s):  
W. T. Donlon ◽  
J. E. Allison ◽  
S. Shinozaki
Keyword(s):  
Electron Microscopy ◽  
Automotive Industry ◽  
Fuel Economy ◽  
High Strength ◽  
Al Alloys ◽  
Light Weight ◽  
Thin Sections ◽  
Strength And Durability ◽  
Rapidly Solidified ◽  
Whitney Aircraft

Light weight materials which possess high strength and durability are being utilized by the automotive industry to increase fuel economy. Rapidly solidified (RS) Al alloys are currently being extensively studied for this purpose. In this investigation the microstructure of an extruded Al-8Fe-2Mo alloy, produced by Pratt & Whitney Aircraft, Goverment Products Div. was examined in a JE0L 2000FX AEM. Both electropolished thin sections, and extraction replicas were examined to characterize this material. The consolidation procedure for producing this material included a 9:1 extrusion at 340°C followed by a 16:1 extrusion at 400°C, utilizing RS powders which have also been characterized utilizing electron microscopy.

The Relation of Locomotive Maintenance to Fuel Economy

1918 ◽  
Vol 86 (2218supp) ◽  
pp. 11-11
Author(s):  
Frank McManamy
Keyword(s):  
Fuel Economy
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