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

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.

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

Thermal Science ◽

10.2298/tsci190308172k ◽

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.

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Technical Solutions of Forest Machine Hybridization

Energies ◽

10.3390/en14102793 ◽

2021 ◽

Vol 14 (10) ◽

pp. 2793

Author(s):

Václav Mergl ◽

Zdravko Pandur ◽

Jan Klepárník ◽

Hrvoje Kopseak ◽

Marin Bačić ◽

...

Keyword(s):

Hybrid System ◽

Technological Development ◽

New Technology ◽

Storage Device ◽

Hydraulic Motor ◽

Hybrid Propulsion ◽

Hydraulic Hybrid ◽

Drive Systems ◽

Hydraulic Accumulator ◽

Technical Solutions

The paper deals with the characteristics of three different types of power train hybridization of forest logging machines and with the benefits of reducing environmental impacts by comparing new technology with more conventional, older technology. New hybridization options that could be implemented in forestry machines are also discussed. The paper divides a hybrid solution into three classes based on the energy used in the system of hybridization. First is an electro-hybrid system that uses an electric motor and battery or different storage device. The second, a hydraulic hybrid system, is a solution with a hydraulic accumulator, hydraulic motor, and pump. The third system is a combination of the electro-hybrid and hydraulic-hybrid system. The current technical and technological development of hybrid drive systems, as well as their components, has led to significant improvements in drive performance and thus better performance of the new generation of forest vehicles. Improved energy efficiency using hybrid propulsion systems in forest vehicles would result in a significant reduction in greenhouse gas emissions and possibly lower maintenance costs.

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Fuel Efficiency Comparison Between a Conventional and a Hybrid Vehicle Using a Model Based on MATLAB/Simulink and ADAMS

Volume 5: 13th Design for Manufacturability and the Lifecycle Conference; 5th Symposium on International Design and Design Education; 10th International Conference on Advanced Vehicle and Tire Technologies ◽

10.1115/detc2008-50028 ◽

2008 ◽

Author(s):

Brian S. Fan ◽

Amir Khajepour ◽

Mehrdad Kazerani

Keyword(s):

Fuel Economy ◽

Model Simulation ◽

Hybrid Vehicle ◽

Published Data ◽

Simulation Platform ◽

Vehicle Model ◽

Control Logic ◽

Matlab Simulink ◽

Conventional Vehicle ◽

Fuel Economy Improvement

Recent development of hybrid vehicles in the automotive industry has demonstrated the capability of reducing fuel consumption while maintaining vehicle performance. The purpose of this paper is to present a hybrid vehicle model created in MATLAB and ADAMS, and its fuel economy improvement over a conventional vehicle system. The hybrid vehicle model discussed in this paper utilizes the Honda IMA (Integrated Motor Assist) architecture. The powertrain components’ power output calculation and the control logic were modeled in MATLAB/Simulink, while the mechanical inertial components were modeled in ADAMS. Communication between MATLAB and ADAMS was established by ADAMS/Controls. The vehicle model created using MATLAB and ADAMS provides a more accurate, more realistic, and a highly flexible simulation platform. In order to evaluate the accuracy of the MATLAB/ADAMS hybrid vehicle model, simulation results were compared to the published data of ADVISOR. Fuel economy of hybrid and conventional vehicle models were compared using the EPA New York City Cycle (NYCC) and the Highway Fuel Economy Cycle (HWFET). The hybrid vehicle demonstrated 8.9% and 14.3% fuel economy improvement over the conventional vehicle model for the NYCC and HWFET drive cycles, respectively. The MATLAB/ADAMS vehicle model presented in this paper, demonstrated the fuel economy advantage of the hybrid vehicle over the conventional vehicle model, while offering a simulation platform that is modular, flexible, and can be conveniently modified to create different types of vehicle models.

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A Model Predictive Control Approach for Fuel Economy Improvement of a Series Hydraulic Hybrid Vehicle

Energies ◽

10.3390/en7117017 ◽

2014 ◽

Vol 7 (11) ◽

pp. 7017-7040 ◽

Cited By ~ 14

Author(s):

Tri-Vien Vu ◽

Chih-Keng Chen ◽

Chih-Wei Hung

Keyword(s):

Model Predictive Control ◽

Predictive Control ◽

Fuel Economy ◽

Hybrid Vehicle ◽

Control Approach ◽

Hydraulic Hybrid ◽

Fuel Economy Improvement ◽

Hydraulic Hybrid Vehicle

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Modeling and Simulation of Medium-Duty Tactical Truck for Fuel Economy Improvement

Volume 11: New Developments in Simulation Methods and Software for Engineering Applications; Safety Engineering, Risk Analysis and Reliability Methods; Transportation Systems ◽

10.1115/imece2010-37112 ◽

2010 ◽

Author(s):

Y. Gene Liao ◽

Chih-Ping Yeh ◽

Allen M. Quail

Keyword(s):

Modeling And Simulation ◽

Fuel Economy ◽

Automatic Transmission ◽

Vehicle Model ◽

Model And Simulation ◽

Vehicle Data ◽

Experimental Vehicle ◽

Shift Schedules ◽

Fuel Economy Improvement ◽

The Impact

The impact of the vehicle fuel economy in tactical convey is amplified due to the fact that much of the present logistics support is devoted to moving fuel. Fuel economy improvement on medium-duty tactical truck has and continues to be a significant initiative for the U. S. Army. The focus of this study is the investigation and analysis of Automated Manual Transmissions (AMT) that have potential to improve the fuel economy of the 2.5-ton cargo trucks. The current platform uses a seven-speed automatic transmission. This study utilized a combination of on-road experimental vehicle data and analytical vehicle model and simulation. This paper presented the results of (1) establishment of a validated, high fidelity baseline analytical vehicle model, (2) modeling and simulation of two AMTs and their control strategy, and (3) optimization of transmissions shift schedules to minimize the fuel consumption. The fuel economy discrepancy between experimental average and the baseline simulation result was 2.87%. The simulation results indicated a 12.2% and 14.5% fuel economy improvement for the 12-speed and 10-speed AMT respectively.

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Experiment for a Parallel Hydraulic Hybrid Terminal Tractor

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.543-547.211 ◽

2014 ◽

Vol 543-547 ◽

pp. 211-214

Author(s):

Li Jing Zhu

Keyword(s):

Fuel Economy ◽

Regenerative Braking ◽

Test Results ◽

Scheme Design ◽

Braking System ◽

Construction Design ◽

Hydraulic Hybrid ◽

Fuel Economy Improvement ◽

Good Operation ◽

Design Construction

Hydraulic hybrid technology of vehicle has the potential to significantly improve fuel economy and reduce emission, and increasingly aroused the attention of the research institutions and automotive manufacturers all over the world. The main of this work is to design a parallel hydraulic hybrid system for a heavy terminal tractor. Firstly, overall scheme design, construction design, and hydraulic regenerative braking system (HRBS) for terminal tractor are designed. Furthermore, the hydraulic hybrid terminal tractor is refitted successfully. The test results show that the sample vehicle is credible and in good operation, a fuel economy improvement of the new scheme is 38.1%~61.6% more than conventional baseline. Experimental study has very important value in the hydraulic hybrid terminal tractor real application.

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Analysis of the Wheel Loader Hydraulic Hybrid System Based on Braking Energy Recovery

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.687-691.171 ◽

2014 ◽

Vol 687-691 ◽

pp. 171-174

Author(s):

Hui Xian Han ◽

Xian Li Cao

Keyword(s):

Energy Saving ◽

Hybrid System ◽

Fuel Economy ◽

Energy Recovery ◽

Dynamic Performance ◽

Wheel Loader ◽

Improve Fuel Economy ◽

Hydraulic Hybrid ◽

Configuration Energy ◽

Braking Energy Recovery

The wheel loader will release a lot of energy in the process of reducing the speed and braking. In the paper it introduced the types and features of the loader hydraulic hybrid system, analyzed configuration, energy saving scheme and working state of the loader parallel hydraulic hybrid system. The results show that the parallel hydraulic hybrid system is applied to the loader, not only it can efficiently recovery braking energy, but also it can improve the dynamic performance of the loader, so the engine can work in the optimal fuel economy area, improve fuel economy.

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