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Model-Based Design of a Hybrid Powertrain Architecture with Connected and Automated Technologies for Fuel Economy Improvements

Center For Automotive Research-Kristina Kuwabara, Jacqueline Karl-DeFrain
Center for Automotive Research-Mahaveer Kantilal Satra
  • Technical Paper
  • 2020-01-1438
To be published on 2020-04-14 by SAE International in United States
Simulation-based design of connected and automated hybrid-electric vehicles is a challenging problem. The design space is large, the systems are complex, and the influence of connected and autonomous technology on the process is a new area of research. The Ohio State University EcoCAR Mobility Challenge team developed a comprehensive design and simulation approach as a solution. This paper covers the detailed simulation work conducted after initial design space reduction was performed to arrive at a P0-P4 hybrid vehicle with a gasoline engine. Two simulation environments were deployed in this strategy, each with unique advantages. The first was Autonomie, which is a commercial software tool that is wellvalidated through peer-reviewed studies. This allowed the team to evaluate a wide range of components in a robust simulation framework. To ensure consistent evaluation between potential architectures, the team paired Autonomie with a particle swarm optimizer to automatically calibrate the hybrid supervisory control and achieve near optimal control calibrations. The team also utilized a dynamic programming model environment to evaluate the fuel economy impact of connected and autonomous systems…
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The Road to the Top is Not on the Map: Conversations with Top Women of the Automotive Industry

Terry Barclay
Center For Automotive Research-Carla Bailo
  • Book
  • R-491
Published 2019-09-04 by SAE International in United States

Carla Bailo, CEO of the Center for Automotive Research, and Terry Barclay, CEO of Inforum, bring together over 30 of the most influential women in the automotive industry to share their insight and advice. From suppliers to OEMs, they hail from every corner of the industry.

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Estimating the Cost Impact of Lightweighting Automotive Closures

Alaa Noah
Center For Automotive Research-Luke Deptula
Published 2015-04-14 by SAE International in United States
The approaching corporate average fuel economy (CAFE) regulations will again increase with new model years (MY). The U.S. Government finalized a regulation requiring cars and light trucks average 54.5 mpg fuel economy for MY2025. Vehicle manufacturers recognize removing weight is a key feature to meeting their targets for fuel economy and emission reductions. One common OEM strategy is the implementation of incremental weight reductions to attain these goals. The automotive industry continues to look for opportunities to reduce weight and cost while continually increasing performance and safety. Lightweighting technologies enhance vehicle performance, (fuel economy, acceleration, braking and emissions). New materials are available to reduce weight; however the incremental cost for the weight reduction can be prohibitive. This study will encompass the utilization of lightweight materials, as well as current and evolving manufacturing processes. Where reducing weight while achieving performance targets for dent resistance, stiffness, and crash-worthiness are the goals; the key is to attain a lightweight assembly that assists in meeting the fuel economy targets, through optimized part design and/or material substitution.Determining the cost to…
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A Design Procedure for Alternative Energy Storage Systems for Hybrid Vehicles

Center For Automotive Research-Marcello Canova
GM R&D Center-Kerem Koprubasi
Published 2011-09-11 by SAE International in United States
Although electrochemical batteries are the mainstream for hybrid vehicle energy storage, there is continuing interest in alternative storage technologies. Alternative energy storage systems (AESS), in the form of mechanical flywheels or hydraulic accumulators, offer the potential to reduce the vehicle costs, compared to the use of electrochemical batteries. In order to maximize the benefits of mechanical or hydraulic energy storage, the system design must maximize the energy recuperation through regenerative braking and the use of the energy stored with high roundtrip efficiency, while minimizing system volume, weight and cost.This paper presents a design procedure for alternative energy storage systems for mild-hybrid vehicles, considering parallel hybrid architecture. The procedure is applied with focus on the definition of design parameters and attributes for a hydraulic AESS with high pressure accumulator. The design methodology is based on a definition of targets and constraints for the AESS, obtained from a statistical analysis of the energy and power requirements of a variety of drive cycles.The design obtained was then implemented in an energy-based simulator over a selected variety of driving…
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Modeling and Analysis of a Turbocharged Diesel Engine with Variable Geometry Compressor System

SAE International Journal of Engines

Center For Automotive Research-Marcello Canova
General Motors-Yue-Yun Wang
  • Journal Article
  • 2011-24-0123
Published 2011-09-11 by SAE International in United States
In order to increase the efficiency of automotive turbochargers at low speed without compromising the performance at maximum boost conditions, variable geometry compressor (VGC) systems, based on either variable inlet guide vanes or variable geometry diffusers, have been recently considered as a future design option for automotive turbochargers.This work presents a modeling, analysis and optimization study for a Diesel engine equipped with a variable geometry compressor that help understand the potentials of such technology and develop control algorithms for the VGC systems,.A cycle-averaged engine system model, validated on experimental data, is used to predict the most important variables characterizing the intake and exhaust systems (i.e., mass flow rates, pressures, temperatures) and engine performance (i.e., torque, BMEP, volumetric efficiency), in steady-state and transient conditions. The model is used to explore the engine system sensitivity to the VGC control input; in particular, its effect on the engine performance and compressor stability is evaluated. A preliminary optimization for steady-state (open-loop) control of the VGC system is then proposed.
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Effect of Traffic, Road and Weather Information on PHEV Energy Management

Center For Automotive Research-Vincenzo Marano
Ohio State Univ-Giorgio Rizzoni
Published 2011-09-11 by SAE International in United States
Energy management plays a key role in achieving higher fuel economy for plug-in hybrid electric vehicle (PHEV) technology; the state of charge (SOC) profile of the battery during the entire driving trip determines the electric energy usage, thus determining the fuel consumed. The energy management algorithm should be designed to meet all driving scenarios while achieving the best possible fuel economy. The knowledge of the power requirement during a driving trip is necessary to achieve the best fuel economy results; performance of the energy management algorithm is closely related to the amount of information available in the form of road grade, velocity profiles, trip distance, weather characteristics and other exogenous factors. Intelligent transportation systems (ITS) allow vehicles to communicate with one another and the infrastructure to collect data about surrounding, and forecast the expected events, e.g., traffic condition, turns, road grade, and weather forecast. The ability to effectively interpret this traffic and weather data to estimate the power demand is important for the energy management and plays crucial role in the battery utilization.This paper presents…
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Model-Based Characterization and Analysis of Diesel Engines with Two-Stage Turbochargers

Center For Automotive Research-Marcello Canova
General Motors Corp.-Yue-Yun Wang
Published 2010-04-12 by SAE International in United States
Two-stage turbochargers are a recent solution to improve engine performance, reducing the turbo-lag phenomenon and improving the matching. However, the definition of the control system is particularly complex, as the presence of two turbochargers that can be in part operated independently requires effort in terms of analysis and optimization. This work documents a characterization study of two-stage turbocharger systems. The study relies on a mean-value model of a Diesel engine equipped with a two-stage turbocharger, validated on experimental data. The turbocharger is characterized by a VGT actuator and a bypass valve (BPV), both located on the high-pressure turbine. This model structure is representative of a “virtual engine”, which can be effectively utilized for applications related to analysis and control. Using this tool, a complete characterization was conducted considering key operating conditions representative of FTP driving cycle operations. The influence of VGT and BPV on the most significant engine variables and on the operating points of the two compressors was evaluated for different engine torque and speed conditions. The analysis is instrumental to understand the complex,…
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