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A Performance Measurement and Analysis Method for Infotainment System

Hyundai Motor Company-Peace Lee
  • Technical Paper
  • 2020-01-1347
To be published on 2020-04-14 by SAE International in United States
The car infotainment system provides various functions such as navigation, DMB, and external device interworking. In the future, complex new technologies such as remote diagnosis and control, V2X communication, integrated display, and autonomous driving interworking should be reflected. Also, even after mass production, such as smartphones, software must be constantly updated to apply bug fixes and new functions. However, as the internal software modules work together in a complicated way, system performance problems tend to occur due to changes in the software, and if they are not managed from the development stage, more costs must be paid for improvement over time. Moreover, after mass production, the scope of improvement will be limited. Therefore, software must be verified and optimized from time to time to ensure system performance quality from the minimum development process. Generally, various tools are used to verify software performance. Currently, top, perf, strace, gdb, DLT, and bootchart are mainly used on Linux-based platforms. In addition, there is a lack of intuitive statistical information to analyze and judge the overall performance of the…
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A Study on the Design and Development of an Integrated 48V Motor with Motorized Internal Combustion Engine

Hyundai Motor Company-Jongwon Lee, Kyoung-Pyo Ha, Kihoon Nam
Korea Electronics Technology Institute-Jeongjong Lee
  • Technical Paper
  • 2020-01-0446
To be published on 2020-04-14 by SAE International in United States
The electrification of the internal combustion engine is an important item of future automotive technology. By using a motorized internal combustion engine, it is possible to recover waste energy by regeneration technology and to reduce various losses that reduce the efficiency of the internal combustion Engine. This paper summarizes the results of the development of an engine-integrated motor that can be applied to a 48V mild hybrid system for motorization of an internal combustion engine. Like the 48V MHSG-mounted mild hybrid system designed to replace the generator, the motorized internal combustion engine is designed with the scalability as the top priority to minimize the additional space for the vehicle and to mount the same engine in various models. The addition of an integrated motor to the crankshaft instead of the motor of a belt-driven mild hybrid system that replaces the generator will allow the removal of components with redundant functions, starters, etc. and the accessory belt system. The motor mounted on the crankshaft also helps to effectively overcome the disadvantages of the engine, which was…
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A study on optimization of the cross-section of door impact beam for weight reduction

Hyundai Motor Company-Heejin Im
  • Technical Paper
  • 2020-01-0631
To be published on 2020-04-14 by SAE International in United States
This paper focuses on the optimization of the cross section of a member type impact door beam. The cross section of the beam was parameterized by using a geometry morphing tool FCM(Fast Concept Modeler) which plug in CATIA, and the metamodel of FE analysis results was created and optimized by LS-OPT. The ANOVA analysis of results was performed to find the factor of weight reduction. And then a new cross section concept was proposed to overcome the limitation of old structure. The proposed cross section was optimized to obtain the final cross section which has a weight reduction of 10% or more.
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Development of an Air support system for long-distance drive comfort

Hyundai Motor Company-Dongwoo Jeong, Seon Chae Na, Sangdo Park, Sangho Kim, Seungyoung Lee
Hyundai Transys-Inho Lee, Sunghoon Kim
  • Technical Paper
  • 2020-01-0868
To be published on 2020-04-14 by SAE International in United States
Passenger fatigue during long distance driving is greatly influenced by the comfort performance of the seat and is one of the important performance of the seat. In order to satisfy this performance, it is determined by the appropriate contour of the seat and the appropriate pad with sufficient thickness and the frame supporting the pad and coverings. Recently, however, more parts such as ventilation seats and passenger detection sensors have taken up the pad In addition, The height of the vehicle have been lowered to enhance car styling, and battery for electric vehicle applied to the underbody of the vehicle, reducing the package space of seats in the vehicle. These external factors eventually lead to a reduced pad thickness of the seat cushion and exacerbate the most important cushioning in the seat cushion compartments, creating an uncomfortable cushioning problem when driving long distances. To improve the cushion composition of the seat within a limited package, air bladders are applied to the underside of the cushion pad. In addition, the function to support the buttocks using…
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Pre-validation method of steering system by using hybrid simulation

Hyundai Motor Company-Hong Suk Chang
  • Technical Paper
  • 2020-01-0645
To be published on 2020-04-14 by SAE International in United States
In this study, the preliminary validation method of the steering system is constructed and the objective is to satisfy the target performance while minimizing the problems after the detailed design considering it in the conceptual design stage. The first consideration about steering system is how to extract the reliable steering effort for parking. The tire model commonly used in MBD has limited ability to represent deformations under heavy loads. Therefore, it is necessary to study adequate tire model to simulate the behavior due to the large deformation and friction between the ground and the tire. The two approaches related with F tire model and mathematical model are used. The second is how to extract the each link’s load in the conceptual design stage. Until now, each link’s load is derived by the actual vehicle test, and a durability analysis was performed using the pre-settled RIG test conditions. Therefore, in this study, we established the process of deriving the RIG test conditions by integrating the hydraulic system and the dynamic system without actual vehicle test. The…
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Development of the Rig and Hardware-In-the-Loop Test Bench for Evaluating Steering Performance.

Hyundai Motor Company-Changsu Kim, Byungrim Lee, Youngdae Park
  • Technical Paper
  • 2020-01-0647
To be published on 2020-04-14 by SAE International in United States
The development of vehicles faces changes in many future flows. The vehicle’s power transfer systems are being changed from conventional types to Hybrid, Electric and Hydrogen vehicles. At this moment, the technology of EPS (Electric Power Steering) system has been expanding from a simple torque assist system to LKAS(Lane Keeping Assist System), PAP(Park Assist Pilot), ALCAS(Active Lane Change System), ADAS(Advanced Driver Assistance System). A good test bench is necessary for the evaluation of both hardware and control logics of EPS in these complexities of development process. Simultaneous Rig and HiLS tests can be performed to check that the steering hardware system can perform to the concept of the development vehicle and develop EPS control logic performances. The hardware performance of the steering system might be evaluated based on measured friction and stiffness, taking into account various driving conditions. And the control logic of the EPS can be evaluated based on the response capability and steering torque measured through the appropriate vehicle model which could represent virtual driving conditions. In this paper, the environment in which…
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Eco-vehicle Battery System Big-data Analysis and Fault Mode & Fault Tree Analysis Related Robust System Development

Hyundai Motor Company-Jeong-Hun Seo, Yong Jae Kim, Woo Jin Shin, Hee Yae Yang, Yuseok Kim, Kang Ju Cha, Mi Seon Kim
  • Technical Paper
  • 2020-01-0447
To be published on 2020-04-14 by SAE International in United States
High-voltage battery system plays a critical role in eco-friendly vehicles due to its effect on the cost and the electric driving range of eco-friendly vehicles. In order to secure the customer pool and the competitiveness of eco-vehicle technology, vehicle electrification requires lowering the battery cost and satisfying the customer needs when driving the vehicles in the real roads, for example, maximizing powers for fun drive, increasing battery capacities for achieving appropriate trip distances, etc. Because, these vehicle specifications have a critical effect on the high-voltage battery specification, the key technology of the vehicle electrification is the appropriate decision on the specification of the high-voltage battery system, such as battery capacity and power.These factors affect the size of battery system and vehicle underfloor design and also the profitability of the eco-friendly vehicles. In this work, the big data of Sonata HEV/PHEV battery system has been analyzed in term of four categories: cell, thermal management, 12V battery, and power electronics part. Analysis results shows that the ratio of CD/CS mode driving in real roads well matches the…
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Development of logistic regression models to classify seat fit

Hyundai Motor Company-Baekhee Lee
Texas A&M University - Corpus Christi-Jangwoon Park
  • Technical Paper
  • 2020-01-0869
To be published on 2020-04-14 by SAE International in United States
The digital evaluation process of vehicle-seat dimensions is an efficient and cost-effective way to achieve better comfort and proper fit. The present study is intended to quantify the statistical relationships between seat dimensions (e.g., insert width and bolster height defined at SAE J2732) and subjective seat fit (e.g., too tight, right fit, or too wide). Subjective fit evaluations for 45 different vehicle seats were collected, and the corresponding vehicle seat dimensions at various cross-sectional planes were collected. The best subset logistic regression analyses were applied to quantify the relationships between the collected subjective fit and seat dimensions at each cross-sectional plane. As a result, significant seat dimensions on the subjective fit were identified and their statistical relationships were quantified as regression coefficients. The developed logistic models showed 80% - 90% as an overall classification accuracy for learning datasets, and around 80% accuracy for testing datasets with five-fold cross-validations. The developed models would be particularly useful to identify optimal seat dimensions providing proper fit, reduce development cost for an automobile seat, and increase work efficiency in…
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The Effect of Driver's Behavior and Environmental Conditions on Thermal Management of Electric Vehicles

Hyundai Motor Company-Jaewoong Kim
University of Michigan - Dearborn-Rodolfo Rodriguez, Kyoung Hyun Kwak, Dewey Jung, Youngki Kim
  • Technical Paper
  • 2020-01-1382
To be published on 2020-04-14 by SAE International in United States
Worldwide projections anticipate fast-growing market share of the battery electric vehicles (BEVs) to meet stringent emissions regulations for global warming and climate change. One of the new challenges of BEVs is effective and efficient thermal management of the BEV to achieve minimal parasitic power consumption and maximal driving range. Typically, the total efficiency of BEVs depends on the performance of the thermal management system which is highly affected by several factors including driving environments (ambient temperature and traffic conditions) and driver's behavior (aggressiveness). Therefore, this paper investigates the influence of these factors on the energy consumption by using a comprehensive BEV simulation integrated with a thermal management system model. The vehicle model was validated with experimental data and a simulation study is performed by using the vehicle model over various traffic scenarios generated from a traffic simulator. Particularly, the aggressiveness of a human driver is emulated by varying parameters in the intelligent driver model.
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The Analysis of Brake Squeal Noise Related to the Friction Properties of Brake Friction Materials

Hyundai Motor Company-Sang-mok Lee, Jung Hoon Woo, Dong Won Kim
Hyundai Motor Company & KIA Motors Corporation-Younggu Cho
Published 2019-09-15 by SAE International in United States
The friction properties related to squeal noise was analyzed with the development histories and simplified computational method. Firstly, the development histories were investigated especially focusing on the case which the friction materials were modified to improve squeal noise occurrence. Based on the histories, the friction properties of selected friction materials were newly measured using dynamometer. The average friction coefficient levels, torque oscillations, the increment of friction coefficient during full-stop, and etc. were compared with the squeal noise occurrence, and the results showed that increase of friction properties cause production of squeal noise. The result suggested that the size of friction energy was important factors related to triggering the squeal noise. Also, the contact conditions between rotor disc and friction materials were significant factors deciding the noise occurrence. We performed simplified computational analysis using MATLAB program to prove the effect of friction energy on the noise occurrence. The friction surfaces were roughly designed and the distribution of contact plateaus was controlled to simulate different contact conditions. The different contact conditions were designed and performed sliding at…
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