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Lookie Here! Designing Directional User Indicators Across Displays in Conditional Autonomous Vehicles

Georgia Institute of Technology-Wei Wang, Hongnan Lin
Harman Connected Services-Pranav Nair
  • Technical Paper
  • 2020-01-1201
To be published on 2020-04-14 by SAE International in United States
Based on the SAE’s classification (J3016), drivers’ attention will be gradually released from the driving task as the level of automation in the vehicle increases. It allows drivers to complete more non-driving related tasks in information and entertainment system. The trigger point for the major transition in driver control happens in the progression from level 2 to level 3 when the automated driving system (ADS) starts to perform a major part of the dynamic driving task (DDT) in the allowed conditions, but meanwhile it still needs the drivers are ready for takeover control or other interventions in a short time. In this paper, we investigated whether providing directional alerts to a user’s active screen with non-driving related tasks can augment their ability in regaining situational awareness on road hazard when traveling in a conditional autonomous vehicle. A user study (N=15) was conducted to compare solutions between the central and peripheral field across displays where subjects were seated in an autonomous vehicle simulator and distracted by playing a game on a tablet screen (iPad). With different…
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Study on Multivariable Control for Air and Charging System of Gasoline Engine

SAE International Journal of Passenger Cars - Electronic and Electrical Systems

BAIC Motor Corporation Powertrain Center, China-Liu Shao Fei
BAIC Motor, China-Wei Wang
  • Journal Article
  • 07-12-02-0006
Published 2020-02-07 by SAE International in United States
This study explores the multivariable multi-input–multi-output technique based on nonlinear models to decouple actuator interaction and to reduce the calibration workload, as well as to increase control performances, under transient conditions, and also explores the robustness on model uncertainties and system parameter variations. The development of a nonlinear dynamic physical model of air in gasoline engine and its charging system provides the for the control technology. The model uses feedback linearization control to decouple the interaction between actuators and compensate the nonlinearity. A new set of inputs was defined through inversing the differential equation of the system. The relationship between the new inputs and the output is linear and decoupled. In addition, a linear control module is used to ensure transient and steady-state performance as well as closed-loop robustness. The control method has been confirmed on the bench test with a three-cylinder gasoline engine prototype for hybrid electric vehicles. Transient test results show that the controller is able to coordinate the actuator to achieve the targets.
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A Multi-Function Automotive MM-Wave Radar Design

Shenyang Institute of Automation, CAS-Xin Bi, Zheng Ma, Wei Wang, Jinsong Du
Published 2016-09-14 by SAE International in United States
A 24GHz multi-function assist system has been developed for advanced automotive radar, which includes different applications in Blind Spot Detection (BSD), Lane Change Assist (LCA), Doors Open Warning (DOW) and Rear Cross Traffic Alert (RCTA). The multi-function radar is based on the micro-strip antenna, which has a reasonable design on main-lobe and side-lobes. According the antenna, the radar can operate in mid-range mode with a high gain and a narrow beam width, whilst performing well in short-range and wide-angle mode.
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Application of QFD and KANO Model in Vehicle Technical Characteristics Setup

FAW R&D Center-Jiaquan Chen, Min Qin, Lingge Jin, Liu Tao, Yongfeng Jiang, Wei Wang
Oakland University-Yin-Ping Chang
Published 2015-04-14 by SAE International in United States
An automotive vehicle should be designed to satisfy the wants of customers. The key is how to convert voices of customers into engineering languages. In other words, transfer the wants of customers into the right technical characteristics of a vehicle. A questionnaire of customer wants for a CUV (Crossover Utility Vehicle) is created and processed. Using QFD (Quality Function Deployment) and modified KANO model, the relative important degree is obtained from the original relative important degree of customer wants surveyed. Since some information gained is uncertain and the questionnaire sample is limited, a gray correlation analysis method is introduced, which calculates the competitive important degree of customer wants, then the final important degree of customer wants is gained by integrating the relative important degree and the competitive important degree. In order to solve the correlation degree of the wants of customers and the vehicle technical characteristics, Six senior auto experts are investigated through a special designed questionnaire. According to the survey results, a correlation matrix of customer wants and technical characteristics is built up, thus…
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Hardware-in-the-loop Simulation for an Integrated Braking System

Beihang University-Jiawang Yong, Feng Gao, Nenggen Ding, Wei Wang
GAC Automotive Engineering Institute-Xianrong Hu
Published 2015-04-14 by SAE International in United States
Comparing with traditional braking systems of automobiles, the brake-by-wire (BBW) system has a faster dynamic response and is more suitable for applications that facilitate regenerative braking. As the two main categories of BBW systems, the well-known electro-hydraulic braking system and electro- mechanical braking system are not compact enough and their fail-safe function has always been a worrying aspect. A new BBW system called integrated braking system (IBS) by employing the hydraulic multiplex method was proposed in recent years. The IBS implements power-assisted braking and active braking by means of just an integrated unit. It can certainly be used for ABS, ASR and ESC systems for building up and reducing brake pressure. Presented in the paper is a new structure of IBS, which is mainly composed of a motor, ball screw, master cylinder and four 2/2-way valves. The main parameters of the system and performance requirements of the motor are determined by means of simulation in MATLAB/Simulink. The prototype and controller of the system had been developed, and the hardware-in-the-loop simulation (HILS) test rig was built.…
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Frequency Conversion Controlled Vapor Recovery System by Temperature and Flow Signals: Model Design and Parameters Optimization

Arizona State University-Wei Wei
Purdue University-John Lumkes
Published 2013-09-24 by SAE International in United States
Current gasoline-gas vapor recovery system is incomplete, for it cannot adjust the vapor-liquid ratio automatically due to the change of working temperature. To solve this problem, this paper intends to design a new system and optimize its parameters. In this research, variables control method is used for tests while linear regression is used for data processing. This new system moves proportion valve away and adds a DSP control module, a frequency conversion device, and a temperature sensor. With this research, it is clearly reviewed that the vapor-liquid ratio should remains 1.0 from 0 °C to 20 °C as its working temperature, be changed into 1.1 from 20 °C to 25 °C, be changed into 1.2 from 25 °C to 30 °C, and be changed into 1.3 when the working temperature is above 30 °C.
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Adhesion Control Method Based on Fuzzy Logic Control for Four-Wheel Driven Electric Vehicle

SAE International Journal of Passenger Cars - Mechanical Systems

Beijing Auto Technology Center-Jiantao Yang
China Dingyuan Automotive Proving Ground-Wei Wang
  • Journal Article
  • 2010-01-0109
Published 2010-04-12 by SAE International in United States
The adhesion control is the basic technology of active safety for the four-wheel driven EV. In this paper, a novel adhesion control method based on fuzzy logic control is proposed. The control system can maximize the adhesion force without road condition information and vehicle speed signal. Also, the regulation torque to prevent wheel slip is smooth and the vehicle driving comfort is greatly improved. For implementation, only the rotating speed of the driving wheel and the motor driving torque signals are needed, while the derived information of the wheel acceleration and the skid status are used. The simulation and road test results have shown that the adhesion control method is effective for preventing slip and lock on the slippery road condition.
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Design Binder Cushion Force Curve using FEA

Ford Motor Company-Maurice Lou
Rouge Steel Company-Rui Li, Wei Wang
Published 2001-10-16 by SAE International in United States
No Abstract Available.
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A Realistic Friction Test for Sheet Forming Operations

The Ohio State Univ.-Wei Wang, Robert H. Wagoner
Published 1993-03-01 by SAE International in United States
A new technique for measuring the friction coefficient between the punch and workpiece during sheet forming operations has been developed at the Ohio State University. Various materials, such as interstitial-free (IF) steel, high strength (HS) steel, an aluminum alloy (2008T4) and 70/30 brass, were tested under dry and oil lubrication conditions at different punch rates and process conditions. The results show that punch friction depends on the angle of wrap, which varies with punch stroke, and on the strain rate, which depends on punch velocity. The O.S.U. Friction Test is described and typical results are presented which verify the usefulness of the new procedure.
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