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Ha, Jinho
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A Co-Simulation Platform for Powertrain Controls Development

Hyundai-Kia America Technical Center Inc.-Shihong Fan, Yong Sun, Jason Hoon Lee, Jinho Ha
  • Technical Paper
  • 2020-01-0265
To be published on 2020-04-14 by SAE International in United States
With the advancement of simulation software development, the efficiency of vehicle and powertrain controls research and development can be significantly improved. Traditionally, during the development of a new control algorithm, dyno or on-road testing is necessary to validate the algorithm. Physical testing is not only costly, but also time consuming. In this study, a virtual platform is developed to reduce the effort of testing. To improve the simulation accuracy, co-simulation of multiple software is suggested as each software specializes in certain area. The Platform includes Matlab Simulink, PTV Vissim, Tass Prescan and AVL Cruise. PTV Vissim is used to provide traffic environment to PreScan. PreScan is used for ego vehicle simulation and visualization. Traffic, signal and road network are synchronized in Vissim and PreScan. Powertrain system is simulated in Cruise. MATALB/Simulink serves as master of this co-simulation, and integrates the different software together. It also includes human driver model and a powertrain control function. An ADAS-ISG (Idle Stop and Go) powertrain control algorithm is implemented in Simulink and tested by using the platform under different…
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EGR Temperature Estimation Model Including the Effect of Coolant Flow Rate for ECU Implementation

Hyundai-Kia America Technical Center Inc.-Yong Sun, Jason Hoon Lee, Jinho Ha, Byungho Lee
University of Michigan - Dearborn-Kyoung Hyun Kwak, Dewey Jung
  • Technical Paper
  • 2020-01-0264
To be published on 2020-04-14 by SAE International in United States
Recent gasoline engines utilize more aggressive EGR rate to meet the emissions and fuel economy regulations. The EGR temperature is often estimated by the ECU and its accuracy affects the estimations of EGR flow rate and intake air flow rate and temperature in the ECU. Therefore, the accuracy of EGR temperature estimation becomes more important than ever for precise EGR rate control. Typical lookup map based EGR cooler model without the sensitivity to the coolant flow rate is acceptable and widely used if the heat capacity of the coolant side is high enough. However, the coolant flow rate under real vehicle driving condition often visit lower range where the lookup map based model suffers from the accuracy issues. This paper presents an investigation of the accuracy of the lookup map based model under different heat capacity conditions. In this study, a simple EGR cooler model based on effectiveness-NTU (Number of Heat Transfer Unit) method was also developed for ECU implementation. This model is intended to improve accuracy of the temperature estimation especially at lower coolant…
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A Comparative Study on Engine Thermal Management System

Hyundai-Kia America Technical Center, Inc.-Yong Sun, Jason Hoon Lee, Jinho Ha, EunKyung Lee
The University of Alabama-Samuel Wilson, Hwan-Sik Yoon
  • Technical Paper
  • 2020-01-0946
To be published on 2020-04-14 by SAE International in United States
As the automotive industry faces tighter fuel economy and emission regulations, it is becoming increasingly important to improve powertrain system efficiency. One of the areas to improve powertrain efficiency is the thermal management system. By controlling how to distribute the heat rejected by the engine, especially during the warm-up stage under cold temperatures, an engine thermal management system can improve the overall energy efficiency of the powertrain system. Conventionally, engine thermal management systems have been operated by a mechanical water pump and a thermostat. However, the recent introduction of electric water pumps and electrically-controlled flow valves allow for more sophisticated control of the thermal management system. In this study, these two different thermal management system architectures are investigated by conducting simulations. Specifically, a vehicle model with a high-fidelity thermal management system is developed in GT-SUITE and a simple rule-based control algorithm is applied to control the system. Using the system model, multiple drive cycle simulations are conducted and their performances are compared and discussed.
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Development of Advanced Idle Stop-and-Go Control Utilizing V2I

Hyundai-Kia America Technical Center Inc.-Jason Hoon Lee, Yong Sun, Josiah Humphrey, Jinho Ha, Byungho Lee
  • Technical Paper
  • 2020-01-0581
To be published on 2020-04-14 by SAE International in United States
Previous studies proposed the utilization of Advanced Driver Assistance System (ADAS) for introducing adaptiveness to powertrain control with respect to traffic situation change. When vehicle stops with the engine shut off by Auto Stop/Start function, the controller keeps watching the movement of preceding vehicle using ADAS sensors. Then it restarts the engine automatically as soon as it detects the launch of the vehicle ahead, before the driver releases brake pedal. The control logic also can inhibit Auto Stop/Start under specific driving conditions, for example, stopping for a stop sign or waiting at a roundabout by utilizing the traffic sign recognition function of vision sensor. In the prior studies it was demonstrated through actual vehicle tests that the new control method can improve the Auto Stop/Start performance, thereby mitigating customer complaints regarding the hesitation in engine restart and promoting the usage. However, the previously suggested method based on movement detection becomes useless if there was no target vehicle ahead to follow. The issue arises when the vehicle happens to be the first vehicle from traffic light…
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Development of Adaptive Powertrain Control Utilizing ADAS and GPS

Hyundai Motor Co.-Sejun Kim
Hyundai-Kia America Technical Center Inc.-Jason H. Lee, Kwangwoo Jeong, Jaihyun Lee, Sanghoon Yoo, Byungho Lee, Jinho Ha
Published 2019-04-02 by SAE International in United States
This paper introduces the advancement of Engine Idle Stop-and-Go (ISG, also known as Auto Engine Stop-Start) and Neutral Coasting Control (NCC) with utilizing Advanced Driver Assistance System (ADAS) and GPS. The ISG and the In-Neutral Coasting (also known as Sailing or Gliding) have been widely implemented in recent vehicles for improving their fuel economy. However, many drivers find them somewhat disturbing because they basically change behaviors of their cars from what they used to. This annoyance discourages usages of those functions and eventually undermines their benefit of fuel saving. In order to mitigate the problem, new ISG and NCC algorithms are proposed. As opposed to the conventional logics that rely only on driver’s pedal action, the new algorithms determine whether or not to enable those functions for the given driving condition, based on the traffic information obtained using ADAS sensors and the location data from GPS and navigation map. With the ADAS module, the movement of a vehicle ahead is continuously monitored, and driver’s reaction to the movement is predicted and reflected in controlling ISG…
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Development of Virtual Fuel Economy Trend Evaluation Process

Hyundai-Kia America Technical Center Inc.-Sanghoon Yoo, Jason H. Lee, Byungho Lee, Jinho Ha
Ohio State University-Mustafa Ridvan Cantas, Shihong Fan, Ozgenur Kavas, Santhosh Tamilarasan, Levent Guvenc
Published 2019-04-02 by SAE International in United States
With the advancement of the autonomous vehicle development, the different possibilities of improving fuel economy have increased significantly by changing the driver or powertrain response under different traffic conditions. Development of new fuel-efficient driving strategies requires extensive experiments and simulations in traffic. In this paper, a fuel efficiency simulator environment with existing simulator software such as Simulink, Vissim, Sumo, and CarSim is developed in order to reduce the overall effort required for developing new fuel-efficient algorithms. The simulation environment is created by combining a mid-sized sedan MATLAB-Simulink powertrain model with a realistic microscopic traffic simulation program. To simulate the traffic realistically, real roads from urban and highway sections are modeled in the simulator with different traffic densities. Other traffic elements which would affect the fuel consumption, such as speed limit information, traffic stop sign and a traffic lights with SPaT (Signal Phase and Timing) information, are a part of the simulator. In order to evaluate the performance of the developed algorithms, fuel consumption performance of the developed algorithms are compared with the fuel consumption performance…
This content contains downloadable datasets
Annotation ability available