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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
To be published on 2019-10-01 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.

On-Track Measurement of Road Load Changes in Two Close-Following Vehicles: Methods and Results

Argonne National Laboratory-Michael Duoba, Alejandro Fernandez Canosa
  • Technical Paper
  • 2019-01-0755
To be published on 2019-04-02 by SAE International in United States
As emerging automated vehicle technology is making advances in safety and reliability, engineers are also exploring improvements in energy efficiency with this new paradigm. Powertrain efficiency receives due attention, but also impactful is finding ways to reduce driving losses in coordinated-driving scenarios. Efforts focused on simulation to quantify road load improvements require a sufficient amount of background validation work to support them. This study uses a practical approach to directly quantify road load changes by testing the coordinated driving of two vehicles on a test track at various speeds (64, 88, 113 km//h) and vehicle time gaps (0.3 to 1.3 s). Axle torque sensors were used to directly measure the load required to maintain steady-state speeds while following a lead vehicle at various gap distances. Through trial and error, test methods were developed that appear to provide satisfactory results, considering the challenges of track testing under real-world conditions (wind, weather, temperature changes, etc.). We found that total road load was reduced by about 10–12% at an optimum gap time of 0.25 to 0.4 s. Challenges…

Research on Dynamic Load of Belgian Event Based on VPG

CATARC-Jiansen Yang, Xinyu Wang, xin li
  • Technical Paper
  • 2019-01-0170
To be published on 2019-04-02 by SAE International in United States
The durable load spectrum of the physical proving ground is the necessary input for fatigue life analysis of vehicle parts and components. It is usually obtained by vehicle road load acquisition and load decomposition in the industry, and Virtual Proving Ground (VPG) is gradually replacing this technical route. The belgian road is the typical event in durability test, in this paper, the flexible body and FTire model are applied to the multi-body dynamics model in order to improve the simulation accuracy. The result shows that all the wheel six-component force, shock absorber displacement and axial force acquired by VPG simulation have excellent correlation with real vehicle data. It is also proved that the virtual proving ground technology is a reliable and effective method to obtain the durable load spectrum in the early stage of development.

On the Mechanical Design of the Rolling Road Addition to the CSUF Wind Tunnel

California State University, Fullerton-Ramitha Edirisinghe, Salvador Mayoral
  • Technical Paper
  • 2019-01-0651
To be published on 2019-04-02 by SAE International in United States
For ground effect aerodynamic studies in wind tunnels, boundary layer growth over the floor of the test section is a large concern. Many different techniques have been used to remove this boundary layer, of which creating a moving ground plane is considered the best option. By creating a moving floor in the test section, the ground plane speed can be set to that of the free stream air speed, thus removing the boundary layer or at the very least mitigating the boundary layer growth. Several studies detail the aerodynamic design concerns for such devices, but little information exists on the mechanical design concerns. This work reviews lessons learned during a design study of a rolling road for the wind tunnel at California State University, Fullerton (CSUF) mainly focusing on the motor specification and cooling system design. First, an overview of the major systems that comprise a rolling road apparatus are given. Then, initial constraints and free-body diagrams are presented detailing the forces experienced by the rolling road. From these free-body diagrams, analytical equations are presented…

A Novel Vision-Based Framework for Real-Time Lane Detection and Tracking

Horizon Robotics-Yanhu Shan, yinan yu
Jilin Univ-Jian Wu, Sumin Zhang
  • Technical Paper
  • 2019-01-0690
To be published on 2019-04-02 by SAE International in United States
Lane detection is of crucial importance in ADAS because various modules (i.e., LKAS, LDWS, etc.) need robust and precise lane position to locate themselves and traffic participants to plan an optimal routine or making proper driving decisions. While most of the lane detection approaches depend on great amount of pre-processing and various assumptions to get reasonable result, the robustness and efficiency are deteriorated. To address this problem, a novel framework is proposed in this paper to realize the robust and real-time lane detection. This framework consists of two branches, where canny edge detection and Progressive Probabilistic Hough Transform (PPHT) are introduced in the first branch to achieve an efficient detection. To eliminate the dependency of the framework on assumptions such as flatten road, deep learning based encoder-decoder detection branch, which leverages the powerful nonlinear approximation ability of CNN, is introduced to improve the robustness and contribute a precise intermediate result. Since the detection rate of the CNN branch is much slower than the feature-based branch, a coordinating unit is designed. The two branches also backup…

Autonomous Connected Vehicles: Overview of Application of Open Source Vehicular Data Analytics Platform

Shreya KRISHNA
  • Technical Paper
  • 2019-01-1083
To be published on 2019-04-02 by SAE International in United States
Data Science and Machine Learning areplayig a key role in our everyday lives, as is evident from its applications, such as voice recognition features in vehicles and on cell phones, automatic facial and traffic sign recognition etc. Analysing big data on the basis of searches, pattern recognition and learning algorithms provides deep understanding of the behaviour of processes, systems, nature, and ultimately the people. The already implementable idea of autonomous driving is nearly a reality for many drivers today with the help of lane keeping assistance and adaptive cruise control systems in the vehicle.The drift towards connected, autonomous, and artificially intelligent systems that constantly learns from the big data and is able to make best suited decisions is advancing in ways that are fundamentally important to many automotive industries. The paper envisages the future of connected and autonomous vehicles (CAVs)as computers on wheels. These are pictured as sophisticated systems with on-board sensors as data sources and a lot of other functions and services running to support autonomous driving. These services are considered to be computationally…

An Investigation of Aerodynamic Characteristics of Three Bluff Bodies in Close Longitudinal Proximity

Coventry University-Geoffrey Le Good, Peter Boardman, Max Resnick, Brian Clough
  • Technical Paper
  • 2019-01-0659
To be published on 2019-04-02 by SAE International in United States
The benefit in fuel-saving for road vehicles travelling in close longitudinal proximity stems from the potential reduction in total aerodynamic drag compared to the sum of that for the same number of vehicles when travelling alone. Research in the 1980s considered travelling in close proximity, termed “platooning”, as a means for reducing congestion, but the aerodynamic drag reduction and fuel-savings found in wind tunnel tests and road-trials became the primary focus of further investigations. Practical application was limited by the lack of systems to control vehicle spacing which was critical to the aerodynamic efficiency of the platoon and for safety. However, vehicle communication and control systems associated with the recent development of connected and autonomous vehicles has provided greater opportunity for platooning to be considered again within future traffic management systems. Early research involving passenger cars, and also more recent studies using heavy goods vehicles, has been based on ‘vehicle spacing’ as the test variable. Platoons were of homogeneous constituents and the aerodynamic characteristics of most vehicles in these studies comprised large separated wakes –…

Calibration and Stitching Methods of the Around View Monitor System of Articulated Multi-Carriage Road Vehicle for Intelligent Transportation

Hunan University-Xiexing Feng, Wei LI, Tianyuan Wei, Yinglin Zhang, Libo Cao
  • Technical Paper
  • 2019-01-0873
To be published on 2019-04-02 by SAE International in United States
The Around View Monitor (AVM) system of the long-body road vehicle with multiple articulated carriages usually suffers from the incomplete distortion correction of fisheye cameras on the side of the coach and the irregular image stitching area caused by the change of relative position of the cameras on different carriages while the vehicle is in motion. In response to these problems, a set of calibration and stitching methods of AVM are proposed. When the system is in the calibration mode, first a two-step optimization method is adopted to solve the polynomial radial distortion-based fisheye camera model. Then, a robust corner detection technique is proposed to extract all the chessboard corners and square vertexes in the system calibration scene. With the calibrated camera model and geometric information of the mounted system, the initial look-up table from the fisheye images to a top view of the vehicle is extrapolated. When the system is in working mode, in order to obtain the real-time relative position of cameras on different carriages, the angles between adjunct carriages are measured by…

Customer Oriented Vehicle Dynamics Assessment for Autonomous Driving in Highway

Centro Ricerche Fiat-Giovanni Gabiati
Fiat Chrysler Automobiles-Silvio Data
  • Technical Paper
  • 2019-01-1020
To be published on 2019-04-02 by SAE International in United States
Nowadays, thanks to continuous improvement in IT, carmakers spend great efforts on studies regarding Autonomous driving. Autonomous driving is the most advanced and focused research area for what concerns the automotive field and Carmakers are mainly investing money in this field but in most cases the analysis is centered towards the efforts on control logic, legal issues or possible benefits of autonomous driving. This paper’s objective is to evaluate the vehicle dynamic response of an autonomous driven vehicle, in particular, evaluation of vehicle/driver performance for a highway overtake maneuver. Obviously in this new scenario the vehicle will be driven autonomously, so performance evaluation means comfort evaluation. For this reason, the acceleration magnitude of peaks must be observed in a complete different logic eventually with new thresholds, as well as new magnitudes. Lateral acceleration variation (jerk) for example is going to be a key parameter for this evaluation. RMSs remain interesting indicators for comfort like the best practice for NVH evaluations, but in this kind of maneuvers horizontal accelerations should also be considered. In this very…

Modeling and simulation of centrifugal cylindrical exciting mechanism

Honeywell Integrated Technology China-Henry Guo
North China University of Science & Technology-Haiyang Long, Boan Wu, Jiaxin Liu, Jing Chu, Yaogang Li
  • Technical Paper
  • 2019-01-0804
To be published on 2019-04-02 by SAE International in United States
Vertical vibratory rollers are widely used because of their own advantages. This type of road roller is suitable for a variety of road surfaces that have not yet been compacted. Various soils, gravel, etc. can be solidified by compaction under this type of road roller. Therefore, in order to obtain the ideal analysis process and life expectancy of the vertical vibration wheel, there is a very significant practical significance and economic value. This roller mainly relies on its excitation mechanism. In order to obtain the deformation of the centrifugal cylindrical excitation mechanism during start-up, operation and stop, the ring-fixed external solution of the vibrating wheel is modeled by Creo2.0, and the established model is analyzed by Adams to obtain the speed curve of rotation and revolution of roller. Analytical the statics of exciter turntable by ANSYS. obtain the deformation condition of excitation mechanism. By theoretical calculation, obtain the fever condition of excitation mechanism from the beginning of operation to the thermal equilibrium process. After comparison, I found that the theoretical values were in line with…