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Virtual Co-Simulation Platform for Test and Validation of ADAS and Autonomous Driving

Hunan CRRC Times Electric Vehicle CO., LTD-Tian Zhu
Tongji University-Ke Song, Bin Wei, Zhen Song, Huan Chen
Published 2019-11-04 by SAE International in United States
Vehicles equipped with one or several functions of Advanced Driver Assistant System (ADAS) and autonomous driving (AD) technology are more mature and prevalent nowadays. Vehicles being smarter and driving being easier is an unstoppable trend. In the near future, intelligent vehicles will be mass produced and running on the road. However, before the mass-production of intelligent vehicles, a lot of experimental tests and validations need to be carried out to insure the safety and reliability of ADAS and AD technology. Although the road test of real vehicles is the most reliable and accurate test method, it cannot meet the need of rapid development of technology research due to high time and financial cost. Therefore, a high-efficient design and evaluation methodology for ADAS and AD development and test is a must. In this paper, a virtual co-simulation platform based on MATLAB/Simulink, OpenModelica and Unity 3D game engine (MOMU) is proposed. Simulink is used for vehicle control software modeling. OpenModelica simulates vehicle dynamic models written in Modelica. Unity provides visualized display of ADAS simulation and a virtual…
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Analysis of the Driver’s Breaking Response in the Safety Cut-in Scenario Based on Naturalistic Driving

Tongji University-Jiarui Zhang, Zhixiong Ma, Xichan Zhu
Published 2019-11-04 by SAE International in United States
For the personification of automotive vehicle function performance under common traffic scenarios, analysis of human driver behavior is necessary. Based on China Field Operational Test (China-FOT) database of China Natural Driving Study project, this paper studies the driver's response in the common cut-in scenario. A total of 266 cut-in cases are selected by manual interception of driving recorder video. The relevant traffic environment characteristics are also extracted from video, including light conditions, road conditions, scale and lateral position of cut-in vehicle, etc. Dynamic information is decoded form CAN, such as speed, acceleration and so on. Then image processing results, such as relative speed and distance of cut-in and subject vehicles, are calculated. Statistical results based on above information show the response type and distribution of human driver: the behavior of keeping lane is 96.24%, in which the ratio of braking response is 51.13%. According to this, we choose to further research the behavior of keeping lane, and analyze the influencing factors of braking response. Statistical methods, such as Chi-square test, Spearman correlation test, are used…
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You've Lost That Queasy Feeling…

Autonomous Vehicle Engineering: December 2019

Stuart Birch, Bill Visnic
  • Magazine Article
  • 19AVEP11_06
Published 2019-11-01 by SAE International in United States

Transcontinental research aims to understand the complexities of motion sickness to help improve the automated-vehicle experience.

As concerns mount regarding how occupants of automated vehicles (AVs) will react to being detached from the actual driving experience, researchers are trying to better understand how and why humans are affected by motion sickness. Aided by sophisticated tools and measuring apparatus, multinational research efforts are quantifying the causes of motion sickness - while grappling with the intensely individual nature of the problem.

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WHAT WE'RE DRIVING

Automotive Engineering: November/December 2019

  • Magazine Article
  • 19AUTP11_08
Published 2019-11-01 by SAE International in United States

While I'm among the first media to have driven the mid-engine 2020 Stingray, my time in the car (during the North American Car, Truck and Utility of the Year judging) was but 45 minutes. A very invigorating 45 minutes.

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Development and Testing of Electric Microcar for Indian Cities

VNR VJIET-Amjad Shaik, Srinivasa Rao Talluri, Raju Tappa, Ramu Ratlavath
Published 2019-10-11 by SAE International in United States
Population growth, rapid urbanisation and compounding effects of adding personal vehicles have resulted in increasing the urban air pollution in major Indian cities. Apart from the rising concerns about the urban air pollution, the increasing traffic and lack of parking space difficulties are promoting energy efficient small vehicles. Hence, there is a need to develop a new environmental friendly microcar that relatively affordable and easily manoeuvrable in bigger cities. Electric microcar is one of the most promising options to improve the near term sustainability for personal transportation in cities. This paper mainly presents the development of two seater electric microcar suitable for city driving requirements followed by road test. A mathematical modelling with reference to the urban cycle (Part-one) of modified Indian driving cycle (MIDC) is also carried out for the evaluation of energy and power requirements of electric microcar. The developed electric microcar has been tested on road with the help of the MIDC simulator kit. Results revealed that the developed prototype has demonstrated about 50 km range after one full charge.
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Powertrain Calibration Techniques

AVL LIST GmbH-Ernst Winklhofer, Alois Hirsch, Harald Philipp, Michael Trifterer, Manuel Berglez
Published 2019-09-09 by SAE International in United States
Meeting the particle number (PN) emissions limits in vehicle test sequences needs specific attention on each power variation event occurring in the internal combustion engine (ICE).ICE power variations arise from engine start onwards along the entire test drive. In hybrid systems, there is one further source for transient ICE response: each power shift between E-motor and ICE introduces gas flow variations with subsequent temperature response in the ICE and in the engine aftertreatment system (EAS). This bears consequences for engine out emissions as well as for the EAS efficiency and even for the durability of a catalytic converter.As system calibration engineers must decide on numerous actuator parameters, their decisions, finally, are crucial for meeting legislative limits under the boundary conditions given by the hybrid vehicle’s drive environment.The paper reports on a methodology to measure and evaluate the ICE and EAS response to the vehicle drive requirements and the power shift dynamics between E-motor and ICE.Focus in particular is given to1particle emissions peaks at each engine start and torque variation with measurement of in-cylinder soot formation…
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Developing a Real-World, Second-by-Second Driving Cycle Database through Public Vehicle Trip Surveys

Ford Motor Company-Joseph Supina, Fazal Syed
Wayne State University College of Engineering-Nizar Khemri, Hao Ying
Published 2019-07-08 by SAE International in United States
Real-world second-by-second vehicle driving cycle data is very important for vehicle research and development. A project solely dedicated to generating such information would be tremendously costly and time consuming. Alternatively, we developed such a database by utilizing two publicly available passenger vehicle travel surveys: 2004-2006 Puget Sound Regional Council (PSRC) Travel Survey and 2011 Atlanta Regional Commission (ARC) Travel Survey. The surveys complement each other - the former is in low time resolution but covers driver operation for over one year whereas the latter is in high time resolution but represents only one-week-long driving operation. After analyzing the PSRC survey, we chose 382 vehicles, each of which continuously operated for one year, and matched their trips to all the ARC trips. The matching is carried out based on trip distance first, then on average speed, and finally on duration. Of the total 509,158 trips made by the 382 PSRC vehicles, 496,276 trips (97.47%) were successfully matched to single original ARC trips. The remaining trips were matched to either ARC sub-trips or combined ARC trips. The…
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Drivetrain Noise Source Identification and Active Noise Control of a Heavy Off-Road Vehicle

Dongfeng Motor Technical Center-Zuguo Xia
Gissing Tech. Co., Ltd.-Hailin Ruan, Wei Huang, Longchen Li, Xiaojun Chen, Xiujie Tian, Keda Zhu, Changwei Zheng, Jiapeng Zhao, Renjie Dai
Published 2019-06-05 by SAE International in United States
Drivetrain noise from heavy off-road vehicles mainly includes engine noise, drive shaft noise, wheel-side gear noise, tire pattern noise etc. They are the main noise sources for such vehicles as they greatly influence the ride comfort of the passengers inside. This paper solved the drivetrain noise problems of a heavy off-road vehicle using the method of active noise control (ANC). Firstly, the vehicle is benchmarked and the noise problems are analyzed, while the noise sources are identified by analyzing the transmission principles of the drivetrain. Secondly, ANC strategies are made for the vehicle based on the noise profiles under various operating conditions. Thirdly, the multiple parameters for ANC are computed from simulations modeling the vehicle in idle, constant speed and acceleration respectively. Lastly, road tests are conducted using the multiple parameters from the simulations and a noise reduction of 2-4 dB can be achieved in the whole vehicle. The results has shown that ANC is an effective method for drivetrain noise reduction in heavy off-road vehicles as this paper provides references for the systematic solution…
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A Case Study on Golf Car Powertrain NVH Sources and Mitigation Methods

Club Car, LLC-Adam Clark
Roush Industries, Inc.-Steven Carter, Kenneth Buczek, Mayuresh Pathak
Published 2019-06-05 by SAE International in United States
The golf market has remained flat in North America. Whereas, it has grown worldwide. A trend is seen where the number of young adults and adults over the age of 65 years involved with the game has increased. The demographics in golf showing the most growth also have high standards for the operation of the golf car. They have transcended their expectations to align with some of the qualities expected of automobiles. There is a shift in consumer expectations. Moreover, the market competition has also increased. This drives the OEMs to deliver refined golf cars with NVH being a key aspect in development. This paper showcases a recent study to improve the powertrain N&V performance of an internal combustion engine golf car. Primarily, a test-based approach is followed. Chassis rolls and on road testing are performed for benchmarking and target setting. System and component tests are performed to root cause issues. The tests further help to provide input for mitigation methods for application on the golf cars. Structural modifications address structure-borne noise and perceived vibration.…
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Reducing Vehicle Interior NVH by Means of Locally Resonant Metamaterial Patches on Rear Shock Towers

KU Leuven - DMMS lab, Flanders Make-Luca Sangiuliano, Claus Claeys, Elke Deckers, Bert Pluymers, Wim Desmet
MotionS lab, Flanders Make-Jasper De Smet
Published 2019-06-05 by SAE International in United States
Stringent regulations for CO2 emissions and noise pollution reduction demand lighter and improved Noise, Vibration Harshness (NVH) solutions in automotive industries. Designing light, compact and, at the same time, improved NVH solutions is often a challenge, as low noise and vibration levels often require heavy and bulky additions, especially to be effective in the low frequency regime. Recently, locally resonant metamaterials have emerged among the novel NVH solutions because of their performant NVH properties combined with lightweight and compact design. Due to the characteristic of stop band behavior, frequency ranges where free wave propagation is inhibited, metamaterials can beat the mass law, be it at least in some tunable frequency ranges. Previously the authors demonstrated how metamaterials can reduce the vibrations in a simplified shock tower upon shaker excitation. In this work, the authors apply the metamaterial concept on the real rear shock towers of a vehicle. In order to be able to benchmark the solution, a test vehicle is chosen, which is equipped in its commercial version with a 1.46 kg tuned vibration absorber…
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