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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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Leveraging real-world driving data sets for design and impact evaluation of energy efficient control strategies.

General Motors LLC-Bharatkumar Hegde, Steven E. Muldoon
National Renewable Energy Laboratory-Michael O'Keefe, Jeffrey Gonder
  • Technical Paper
  • 2020-01-0585
To be published on 2020-04-14 by SAE International in United States
Modeling and simulation are crucial in the development of advanced energy efficient control strategies. Utilizing real-world driving data as the underlying basis for control design and simulation lends veracity to projected real-world energy savings. Standardized drive cycles are limited in their utility for evaluating advanced driving strategies that utilize connectivity and on-vehicle sensing, primarily because they are non-causal and are typically intended for evaluating emission and fuel economy under controlled conditions. Real-world driving data, because of its scale, is a useful representation of various road types, driving styles, and driving environments. The scale of real-world data also presents challenges in effectively using it in simulations. A fast and efficient simulation methodology is necessary to handle the large number of simulations performed for design analysis and impact evaluation of control strategies. In this study, we present two methods of leveraging real-world data in both design optimization of energy efficient control strategies and in evaluating the real-world impact of those control strategies upon large-scale deployment. Through these methodologies, strategies with highest impact on energy savings were selected…
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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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Improving EV customer experience using Sound Enhancement

General Motors LLC-Frank Valeri, Glenn Pietila
  • Technical Paper
  • 2020-01-1361
To be published on 2020-04-14 by SAE International in United States
Electric Vehicles are typically thought of as being quiet and refined, but they do come with some unique N&V challenges. Some of these challenges include a natural sound that can be undesirable due to its tonal nature, presence of high frequency, discontinuities in sound, and characteristics and levels that do not always naturally increase with motor torque and vehicle speed. One approach to address those challenges is Electric Vehicle Sound Enhancement (EVSE) which is a software feature embedded within the infotainment system. EVSE can be used to improve the perception of the vehicle by enhancing the preferred natural sounds of the vehicle, masking unusual and annoying components of the sound and aurally conveying information related to the vehicle performance. A jury study was conducted to better understand how EVSE can be used to accomplish this. This paper will summarize a typical EVSE system and highlight some of the tools and methods that can be used to develop an EVSE tuning that mitigates the unpleasant sounds and enhances the customer experience without completely changing the vehicle…
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Test Bench for Static Transmission Error Evaluation in Gears

Politecnico di Torino-Carlo Rosso
Politecnico di Torino / GeDy TrAss-Tommaso Maggi, Claudio Marcellini, Fabio Bruzzone
  • Technical Paper
  • 2020-01-1324
To be published on 2020-04-14 by SAE International in United States
In this paper a test bench for measuring the Static Transmission Error of two mating gears is presented and a comparison with the results obtained with the code GeDy TrAss and a commercial Finite Element software are shown. Static Transmission Error is considered as the main source of overloads and Noise, Vibration and Harshness issues in mechanical transmissions. It is defined as the difference between the theoretical angular position of a gear under load in quasi-static conditions and the real one. This parameter strictly depends on the applied torque and the tooth macro and micro-geometry. The test bench illustrated in this work is designed to evaluate the actual Static Transmission Error of two gears under load in quasi-static conditions. In particular this testbed can be divided in two macro elements: the first one is the mechanism composed by weights and pulleys that generates a driving and a breaking torque up to 500 Nm. The second element is composed by two structures called “support”: one fixed to the floor and the other movable in order to…
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Routing methods considering security and real-time of vehicle gateway system

FESCARO-Daehyun Kim
Infineon Technologies AG-Karel Heurtefeux
  • Technical Paper
  • 2020-01-1294
To be published on 2020-04-14 by SAE International in United States
Recently, vehicle networks have increased complexity due to the demand for autonomous driving or connected devices and require high bandwidth. And vehicle manufacturers have begun applying Ethernet protocols, a new network that can replace existing vehicle network protocols. However, it is difficult to replace the entire CAN protocols with Ethernet protocols completely due to safety and reliability issues. Therefore, the vehicle manufacturer introduced a vehicle gateway system. The system uses Ethernet for the external network and the CAN network for communication between internal controllers. The vehicle gateway system provides an interface for constantly connecting and exchanging vehicle data in a heterogeneous communication environment between the existing CAN network protocol and the external Ethernet protocol. Therefore, it is necessary to design the minimum delay time considering the real time. In addition, since there is a risk of hacking due to external communication connection, a security function to ensure the integrity of the message is essential. This paper introduces routing methods considering security and real time. In the case of security, the Cipher-based message authentication code (CMAC)…
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Dynamic Simulation for LFP pouch batteries Coupled mechanics-electrics-thermodynamics under mechanical abuse

Changan New Energy Automotive Co., Ltd.-Ruiyu ZHANG, Tao Wang, Chenghao Deng, Guoqing Jin, Heping Xiao
China Airlines Lithium Battery Co., Ltd.-Yanbing Zhang
  • Technical Paper
  • 2020-01-1332
To be published on 2020-04-14 by SAE International in United States
The safety design of batteries, an important part in passive safety development of electric vehicle, is difficult in practical project application because of complex structure inside and multi-physical reactions coupled mechanics-electrics-thermodynamics under mechanical abuse. An efficient computational model of batteries that can be attached to model of vehicle used for collision simulation is needed. In this work, four types of multi-physical battery models (detailed computational model, simplified representative-sandwich model, composite layered model and simplified layered model) of pouch cell with LiFePO4 system are established in a commercial finite element software LS-DYNA○R(usually used for vehicle collision simulation) and their difficulty of modeling, calculating time, accuracy of result (respectively in mechanics, electrics and thermodynamics) are compared. In detail, based on quasi-static mechanical experiments of positive and negative current collector, positive and negative current collector with active material, separator and aluminum casing, the component materials are established and validated. The mechanical properties of the detailed computational model constituted of all components of battery are validated by dynamic indentation condition on cell. The mechanical simulation predicts the deformation of…
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ROS and XCP in Traditional ECU Development

ETAS Inc.-Tobias Gutjahr, Matthew Roddy
  • Technical Paper
  • 2020-01-1367
To be published on 2020-04-14 by SAE International in United States
Originally developed for the service robot industry, the Robot Operating System (ROS) has lately received a lot of attention from the automotive sector with use cases, especially, in the area of advanced driver assistance systems and autonomous driving (ADAS/AD). Introduced as communication framework on top a of a host operating system, the value proposition of ROS is to simplify the software development in large-scale heterogeneous computing systems. Developers can focus on the application layer and let ROS handle the discovery of all participants in the system and establish communication in-between them. Despite the recent success of ROS, standardized automotive communication protocols such as the Universal Measurement and Calibration Protocol (XCP) are still dominant in the electronic control unit (ECU) development of traditional vehicle subsystems like engine, transmission, braking system, etc. XCP guarantees that common measurement and calibration tools can be used across different vehicles with ECUs from multiple suppliers. With the advancing area of ADAS/AD, we also expect the presence of ROS-based modules in the development of new vehicle platforms to increase. In this paper,…
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Analysis of Various Vehicle Dynamic Simulations Software Packages Using Design of Experiments (DOE)

Engineering Systems Inc.-R. Matthew Brach, Emmanuel Jay Manuel, Robert Bailey, Joshua Rogers, Shawn P. Capser
  • Technical Paper
  • 2020-01-0639
To be published on 2020-04-14 by SAE International in United States
A previous paper on this topic presented the use of design of experiments (DOE) to evaluate the sensitivity of vehicle dynamics simulation of the postimpact motion of a vehicle that included high initial rotational rates. That investigation involved only one software package and thus was confined to one simulation model for the purposes of developing and refining the analysis method rather than including a variety of simulation models for broader application. This paper expands the application of the method to investigate the comparative behavior and sensitivity of several other vehicle dynamic simulation models commonly used in the field of crash reconstruction. The software packages included in the studies presented in this paper are HVE (Simon and EDSMAC4), PC-Crash and VCRware. This paper will present the results of the study, conducted using DOE, using these models. The eleven factors selected for the study presented here were chosen based largely on the results of the prior study. The experimental design was expanded from 16 trials to 32 trials to provide additional insight into the interactions between the…
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A Method for Mapping a Light Source Utilizing HDR Imagery

JS Forensic Consulting, LLC-Jeffrey Suway
Momenta, LLC-Anthony Cornetto
  • Technical Paper
  • 2020-01-0566
To be published on 2020-04-14 by SAE International in United States
Mapping a light source, any light source, is of broad interest to accident reconstructionists, human factors professionals and lighting experts. Such mappings are useful for a variety of purposes, including determining the effectiveness and appropriateness of lighting installations, and performing visibility analyses for accident case studies. Currently, mapping a light source can be achieved with several different methods. One such method is to use an illuminance meter and physically measure each point of interest on the roadway. Another method utilizes a goniometer to measure the luminous intensity distribution, this is a near-field measurement. Both methods require significant time and the goniometric method requires extensive equipment in a lab. A third method measures illumination distribution in the far-field using a colorimeter or photometer. These systems utilize a CCD sensor to measure the illuminance distribution and then software can convert that illuminance distribution to an IES file for use in a Physically-Based Rendering (PBR) engine. Again, this photometer method requires extensive equipment and the measurements must be taken in a laboratory setting. The method presented in this…