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SAE 2014 World Congress and Exhibition

作者： Wang, Ying Han, Fei Kong, Yue Deng, Weiwen State Key Lab of Automotive Simulation and Control Jilin University 130025 China College of Computer Science and Technology Jilin University 130012 China

Vision-based Advanced Driver Assistance Systems (Vi-ADAS) has achieved rapid growth in recent years. Since vehicle field testing under various driving scenarios can be costly, tedious, unrepeatable, and often dangerous, simulation has thus become an effective means that reduces or partially replaces the conventional field testing in the early development stage. This paper proposes a quantitative assessment framework for model quality evaluation of 3D scene under simulation platform. An imaging model is first built. The problem of solving the imaging model is then transformed into the problem of intrinsic image decomposition. Based on Retinex theory and Non-local texture analyses, a superior intrinsic image decomposition method is adopted to evaluate the fidelity of the 3D scene model through the degree of deviation to the Reflectance and Shading intrinsic maps respectively. Some preliminary testing results demonstrate that the proposed assessment framework can produce quantitative evaluation on 3D scene models. Copyright © 2014 SAE International.

关键词： Advanced driver assistance systems

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Characteristic analysis of the influence of flow rate distribution in each flat tube of parallel flow heat exchanger to heat transfer

Characteristic analysis of the influence of flow rate distri...

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2nd International Conference on Advances in Energy and Environmental Science, ICAEES 2014

作者： Yang, Hai Jiang Li, Ming Xue, Xiao Ye Liu, Yan Huang, Kui Dept. of Therm. Energy Eng Jilin Univ Chang chun 130025 China State Key Lab. of Automotive Simulation and Control Jilin Univ Chang Chun 130025 China

ISBN: (纸本)9783038352082

In this paper, the heat transfer rate of parallel flow heat exchanger was obtained in the condition of non-uniform flow distribution by 3D numerical simulation. The maximum theoretical heat transfer rate of parallel flow heat exchanger was obtained through 1D calculation. Ultimately, the correlation of the influence of non-uniform flow distribution on heat transfer efficiency was obtained by the comparative analysis of non-uniform flow distribution and heat transfer efficiency and regression calculation. It was found that the forecasted heat transfer efficiency error of correlation was within 2%. © (2014) Trans Tech Publications, Switzerland.

关键词： Heat transfer

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Modeling and Verification of Steering Torque Feedback System for Driving Simulator

Modeling and Verification of Steering Torque Feedback System...

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IEEE International Conference on Intelligent Transportation Systems

作者： Yuyao Jiang Weiwen Deng Sumin Zhang Hang Zheng State Key Lab. of Automotive Simulation & Control Jilin Univ. Changchun China

ISBN: (纸本)9781479960798

I. Introduction For driving simulator, steering torque feedback is one of the most intuitive and important factors for driver to acquire road feel. The widely used method in the state of the art is based on a dynamic steering torque feedback model. This model takes into consideration of not only many influencing factors such as tire forces, power assist torque, but in particular, the dynamic attributes of a steering system inself, including inertia, damping and compliance, friction, etc. While all these play important roles on the characteristics of the steering torque feedback, little has been studied on the way and the mechanism as how each of these external factors and internal attributes affects the steering torque feedback individually and collectively [1] [2] [3]. The proposed research in this paper is to investigate the effects on the steering torque feedback mainly due to the dynamic attributes of the steering system itself, and to develop more insight on the contributing mechanism with its inertia effects, damping and compliance effect, and effects due to various types of friction, etc. The aim of this research is to improve not only the accuracy of the steering torque model for applications such as driving simulators, but also the design and performance of a steering system with better torque feedback for application such as electric power steer systems or steer-by-wire systems.

关键词： feedback sensitivity analysis steering systems torque tyres vehicle dynamics driving simulator real vehicle experimental result steering torque feedback formulation steering torque feedback model steering torque feedback system tire reactive torque model Force Friction Steering systems Tires Torque Vehicles Wheels

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Trajectory Planning for Vehicle Autonomous Driving with Uncertainties

Trajectory Planning for Vehicle Autonomous Driving with Unce...

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2014 International Conference on Informative and Cybernetics for Computational Social Systems(ICCSS2014)

作者： Hao Sun Weiwen Deng Sumin Zhang Shanshan Wang Yutan Zhang State Key Lab of Automotive Simulation and Control Jilin University Technical Center of Dongfeng Motor

This paper proposes a novel method on dynamic trajectory planning for intelligent vehicle driving under traffic environment with *** statistical characteristics of traffic vehicle motion are first analyzed with a traffic vehicle model,in which the inputs are considered to be random variables with certain probability *** the output of the model can be calculated via unscented transformation for probabilistic *** the overall collision probability of the candidate trajectories is assessed with certain confidence *** a trajectory planning method is employed to achieve multiple objectives for lane change maneuver with combined efficiency and *** is conducted with results demonstrating that the proposed method is valid and effective.

关键词： autonomous driving uncertainties trajectory planning

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A Lane Departure Warning System Developed under a Virtual Environment

A Lane Departure Warning System Developed under a Virtual En...

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2014 International Conference on Informative and Cybernetics for Computational Social Systems(ICCSS2014)

作者： Ye Wang Weiwen Deng Sumin Zhang Yutan Zhang State Key Lab of Automotive Simulation and Control Jilin University Technical Center of Dongfeng Motor

In recent years,many advanced driver assistant systems(ADAS)are developed to address great concerns on vehicle ***,the testing and verification of ADAS can be very time consuming,costly and even *** paper presents a vision-based lane departure warning system(LDW)that is developed under a virtual *** lane departure warning system consists of an image processing module and a pre-warning *** LDW system in this paper is not novel or creative,it’s just a object to show how a LDW system can be developed ender a virtual *** LDW system is largely developed under a real-time virtual environment that includes two d Space1401-based Micro Autoboxes(MABX),a desktop PC,a d Space1006-based real-time simulator,and the required communication *** preliminary simulation has been conducted to verify the proposed camera model and virtual driving environmental model,and the results show that the proposed verification environment is valid and effective.

关键词： LDW Virtual Environment Real Time

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Performance Development Target Setting of Passenger Car Diesel Engine

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Chinese Journal of Mechanical Engineering 2013年第3期26卷 512-517页

作者： ZHENG Guangyong YU Xiumin LIU Jiangwei SONG Tao LI Wenxiang State Key Lab of Automotive Dynamic Simulation Jilin University Research and Development Center FAW Group Corporation

Setting engine emission targets to meet diesel car requirements is particularly important in engine performance development phase. Many researches are focused on associating vehicle performance with engine targets, but most work is done by testing, which is time and cost consuming, furthermore, the relationship of vehicle and engine will change when either engine or vehicle changes. A GT-Drive model to simulate New European Driving Cycle (NEDC) for passenger car is developed and calibrated by testing data, model precision is controlled within 5%. Time distribution of engine operating conditions when car running NEDC cycle has been analyzed, 10 critical major engine operating points are summarized according to running time proportion. Emission of NOx and smoke control regions containing these 10 points for target engine are set. Vehicle emissions are simulated and evaluated during engine development after engine performance test data are got, and engine combustion system layout and calibration are adjusted until vehicle targets are met. Vehicle is tested in chassis dynamometer finally, the testing results show a good agreement with the simulated results with an error of less than 5%, which proves that the emission value exchange of vehicle and engine is reliable. Performance target decomposition method for passenger car diesel presented can greatly shorten the development cycle and save costs.

关键词： passenger car diesel engine emission target New European Driving Cycle simulation analysis

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simulation of the Interaction between Driver and Seat

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Chinese Journal of Mechanical Engineering 2013年第6期26卷 1234-1242页

作者： DU Xiaoming REN Jindong SANG Chunlei LI Lemeng Technical Development Department Faw-Volkswagen Automotive Co. Ltd. State Key Lab of Automotive Dynamic Simulation Jilin University

Test is one of methods to acquire human-seat pressure distribution in driving, with the deficiency of being uneasy to obtain the stress information of soft tissue inside human body and the sheer force of interface between human and seat, which can be obtained by simulation. But current simulation method focuses mainly on calculation itself other than combining it with posture prediction and cab packaging parameters, which cause it difficult to acquire accurate pressure calculation results without accurate posture of human body, and make it almost meaningless to design optimization. Therefore, a human body geometric model with posture change capability is built and linked up with Cascade Prediction Model（CPM）, which takes cab packaging parameters as inputs. A detailed finite element model of driver human body is constructed and used to conduct the driver-seat interaction simulation between human body and seat. Good accordance of pressure distribution is observed between simulation and test, which validates the simulation. In addition to the distribution pattern, curves on key sections are used to analyze the pressure and shear stress on the seat surface, as well as soft tissue stress inside human body. The simulation shows that the maximum stress of buttocks locates under the ischial tuberosity, and the maximum stress of trunk occurs near the scapula posterior and the lower waist. These are the places where fatigue usually occurs. The maximum pressure of seat appears at the driver-seat contact area corresponding to the driver＇s maximum skin tissue stress. In order to guide the seat design and cab packaging and study the influence of posture to pressure distribution, finite element models for different levels of cab packaging parameters are created by using CPM. The pressure distributions are calculated and their tendencies varying with cab packaging parameters are obtained. The method presented provides a new way to accurately simulate the interaction between driver

关键词： seating comfort pressure distribution posture prediction model packaging parameters

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Trajectory planning for vehicle autonomous driving with uncertainties

Trajectory planning for vehicle autonomous driving with unce...

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International Conference on Informative and Cybernetics for Computational Social Systems (ICCSS)

作者： Hao Sun Weiwen Deng Sumin Zhang Shanshan Wang Yutan Zhang State Key Lab of Automotive Simulation and Control Jilin University Changchun China Technical Center of Dongfeng Motor Wuhan China

ISBN: (纸本)9781479947515

This paper proposes a novel method on dynamic trajectory planning for intelligent vehicle driving under traffic environment with uncertainties. The statistical characteristics of traffic vehicle motion are first analyzed with a traffic vehicle model, in which the inputs are considered to be random variables with certain probability distribution. Therefore the output of the model can be calculated via unscented transformation for probabilistic spread. Then the overall collision probability of the candidate trajectories is assessed with certain confidence level. Finally a trajectory planning method is employed to achieve multiple objectives for lane change maneuver with combined efficiency and comfort. simulation is conducted with results demonstrating that the proposed method is valid and effective.

关键词： Vehicles Trajectory Planning Uncertainty Vehicle dynamics Acceleration Cybernetics

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A lane departure warning system developed under a virtual environment

A lane departure warning system developed under a virtual en...

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International Conference on Informative and Cybernetics for Computational Social Systems (ICCSS)

作者： Ye Wang Weiwen Deng Sumin Zhang Yutan Zhang State Key Lab of Automotive Simulation and Control Jilin University Changchun China Technical Center of Dongfeng Motor Wuhan China

ISBN: (纸本)9781479947515

In recent years, many advanced driver assistant systems (ADAS) are developed to address great concerns on vehicle safety. However, the testing and verification of ADAS can be very time consuming, costly and even dangerous. This paper presents a vision-based lane departure warning system (LDW) that is developed under a virtual environment. The lane departure warning system consists of an image processing module and a pre-warning module. The LDW system in this paper is not novel or creative, it's just a object to show how a LDW system can be developed ender a virtual environment. The LDW system is largely developed under a real-time virtual environment that includes two dSpace1401-based MicroAutoboxes (MABX), a desktop PC, a dSpace1006-based real-time simulator, and the required communication buses. Some preliminary simulation has been conducted to verify the proposed camera model and virtual driving environmental model, and the results show that the proposed verification environment is valid and effective.

关键词： Vehicles Cameras Real-time systems Computational modeling Image processing Vehicle dynamics Solid modeling

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Vision-based forward collision warning system design supported by a field-test verification platform

Vision-based forward collision warning system design support...

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IEEE Symposium on Intelligent Vehicle

作者： Bei Ren Weiwen Deng Christian Tomm Fei Han Ying Wang State Key Lab of Automotive Simulation and Control Jilin University of China ETAS GmbH Stuttgart Baden-WÃ¼rttemberg DE

This paper proposes a novel approach of developing a vision-based forward collision warning system (V-FCW) under an integrated platform with both V-FCW algorithm development and field-test data driven system verification. The developed verification platform provides huge amount of video data collected from field testing under various real driving conditions with labeled ground truth and fast search capability. Under this integrated platform, the V-FCW system can be effectively developed, tested and verified under various real driving conditions and scenarios in a lab environment, and in a repeatable, cost effective and even automatic way to achieve robust, reliable and high performance.

关键词： Vehicles IP networks Testing Accuracy Estimation Object detection Memory

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