Global ETD Search
Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 43 for “"drive cycle"”.
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Mechanical design of an automated vehicle driving system for drive cycle testing
… the mechanical design process for an automated drive cycle testing system. Drive cycle is a graph containing series of vehicle speed data versus time. The main reason for drive cycle existence is to analyse the air pollution that is emitted by vehicle engines through combustion process. It is …
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Multi-Physics Engine Simulation Framework for Drive Cycle Emissions Prediction. Development and Validation of a Framework for Transient Drive Cycle NOx Prediction Modelling based on Combining 1-D and 0-D Internal Combustion Engine Simulation and Statistical Meta-Modelling
Real-time full powertrain drive cycle simulations with high-fidelity engine-out NOx emissions prediction capability is a significant challenge nowadays. Specifically, being able to perform these simulations early in engine development process would allow powertrain optimisation in virtual space, …
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The effects of drive cycle accessory load and degree of hybridization on fuel economy and emissions for hybrid electric buses
… on fuel economy was identified. Four different drive cycles - Manhattan, UDDS, CBD, and WVU City cycles - that covered a wide range of driving conditions were chosen as the testing cycles for the simulations. For no accessory load, it was found that the PHEB1, which had the highest degree of …
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Energy Losses for Propelling and Braking Conditions of an Electric Vehicle
… the emphasis is put solely on the average drive cycle efficiency for the vehicle with very little thought given to propelling and braking powertrain losses for individual components. The modeling section of this paper will take basic energy loss equations for vehicle speed and acceleration, …
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The effect of alternative fuels and aftertreatment devices on measured mobile school bus emissions
… the reductions, all tests were performed using a drive cycle developed by Rowan University. This drive cycle is a composite cycle developed from 11 actual school bus routes. The results reported herein were obtained by performing the drive cycle on a test track in Aberdeen, MD within the Aberdeen …
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Closed-Loop Combustion Control of a Multi Cylinder HCCI Engine using Variable Compression Ratio and Fast Thermal Management
… and investigated experimentally by running a hot drive cycle test. To this date it is the first experimental drive cycle test using inlet air preheated HCCI, i.e. FTM. It is concluded that the proposed CLCC strategy in terms of fuel consumption is good enough, but in terms of emissions there is …
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Modeling, design, and optimization of permanent magnet synchronous machines
… the act of running results in an unconventional drive cycle that consists of brief periods of high torque followed by long stretches of minimal torque requirement, a performance envelope that is not matched by commercially-available machines. An optimized motor would dissipate the minimum …
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Mesoscopic Fuel Consumption and Emission Modeling
… vehicle emissions based on typical urban driving cycles. Most of these models offer simplified mathematical expressions to compute fuel consumption and emission rates based on average link speeds while ignoring transient changes in a vehicle's speed and acceleration level as it travels on a …
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Influence of accelerator pedal force feedback on truck drivers' speed control
… making reductions. It is thought that improving driver behaviour offers significant potential for these reductions in fuel consumption and emissions. This thesis considers the use of Active Accelerator Pedals (AAPs) and the potential for improved driver performance that they may offer by …
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Performance Evaluation of a Cascaded H-Bridge Multi Level Inverter Fed BLDC Motor Drive in an Electric Vehicle
… fashion in an EV and make it follow a given drive cycle. The switching operation and control of a multi level inverter for specific power level and desired performance characteristics is investigated. The EV has been designed from scratch taking into consideration the various factors such as …
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Predicting hybrid vehicle fuel economy and emissions with neural network models trained with real world data
… These models simulate aspects of real-world drive cycles that include the driving environment, thermal management, driver input, and powertrain component behavior. In this study, an alternative method of hybrid vehicle FE simulation is developed by training and testing a time series neural …
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VTool: A Method for Predicting and Understanding the Energy Flow and Losses in Advanced Vehicle Powertrains
… wheels of the vehicle to complete a prescribed drive cycle and then explicitly applies component efficiencies to find component losses and the overall energy consumption for the drive cycle. In calculating component efficiencies and losses, VTool offers several tunable parameters that can be …
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A Data Driven Real Time Control Strategy for Power Management of Plug-in Hybrid Electric Vehicles
… from the energy cost point of view for a given drive cycle. The state and decision variables in the DP algorithm are selected in a way that provides the best tradeoff between the computational time and accuracy which is the first contribution of this research effort. These trajectories are then …
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Evaluation of power-assist hydraulic and electric hybrids for medium- and heavy-duty vehicle applications
… Schedule, the HTUF Class 4 Parcel Delivery Cycle, and the Orange County Bus cycle. These drive cycles were chosen on their ability to characterize the variety of operating conditions observed in medium- and heavy-duty vehicles. Using these models, cross technology comparisons were …
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Development and Validation of a Powertrain Simulation Model for Next Generation Mild-Hybrid Buses
… baseline micro-hybrid technology over a standard drive cycle. The optimum drive ratio between the hybrid electric components and the main powertrain was also assessed as well as the effects of replacing the standard battery system with an ultracapacitor energy storage system. The robustness of the …
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An Illustrative Look at Energy Flow through Hybrid Powertrains for Design and Analysis
… 'backwards' energy tracking method, demand for a drive cycle is found using a drive cycle and vehicle parameters. This demand is then used to determine what amount of energy would be required at each component within the powertrain all the way from the wheels to the fuel source, taking into …
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A new approach to estimate congestion impacts for highway evaluation: effects on fuel consumption and vehicle emissions
… level. For the latter of the two (i.e. a given drive cycle) the predictions were within 0.25 per cent. When including the impacts of a generated drive cycle from a known level of acceleration noise, the results show a consistent under-prediction of some 25 percent when compared with on-road test …
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Application of Multidisciplinary Design Optimisation to Engine Calibration Optimisation.
… the legal emissions constraints over a specified drive cycle. As another engineering target, the engine control maps are required as smooth as possible. The Multidisciplinary Design Optimisation (MDO) Frameworks have been studied to develop the optimisation process for the steady state Diesel …
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Understanding the challenges in HEV 5-cycle fuel economy calculations based on dynamometer test data
… phases within the certification driving cycles. This methodology causes additional complexities for hybrid electric vehicles, because although they are required to have charge-balanced batteries over the course of a full drive cycle, they may have net charge or discharge within the …
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Electric-drive vehicle emulation using advanced test bench
… of fossil fuel resources. As a result electric-drive vehicle (EDV) technology is becoming the subject of many research studies, from academia and research laboratories to automotive industries and their suppliers. However, a crucial step toward the success of EDV implementation is developing …
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