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Performance Limit Evaluation Strategy for Automated Driving Systems

Automotive Innovation 2022年第1期5卷 79-90页

作者： Feng Gao Jianwei Mu Xiangyu Han Yiheng Yang Junwu Zhou State Key Laboratory of vehicle NVH and Safety Technology ChongqingChina college of Mechanical and vehicle Engineering Chongqing UniversityChongqingChina passenger vehicle technical center Dongfeng Liuzhou Motor Co.LtdLiuzhouChina

Efficient detection of performance limits is critical to autonomous *** autonomous driving is difficult to be realized under complicated scenarios,an improved genetic algorithm-based evolution test is proposed to accelerate the evaluation of performance *** conducts crossover operation at all positions and mutation several times to make the high-quality chromosome exist in candidate offspring *** the normal offspring is selected statistically based on the scenario com-plexity,which is designed to measure the difficulty of realizing autonomous driving through the Analytic Hierarchy *** benefits of modified cross/mutation operators on the improvement of scenario complexity are analyzed ***,the effectiveness of improved genetic algorithm-based evolution test is validated after being applied to evaluate the collision avoidance performance of an automatic parallel parking system.

关键词： Autonomous driving Test and evaluation Evolution test Genetic algorithm

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Design and Application of vehicle 48V Battery Fixing Structure Based on collision condition

Design and Application of Vehicle 48V Battery Fixing Structu...

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2020中国汽车工程学会年会暨展览会

作者： Song Pengfei Di Shusheng Xiao Chenglin dongfeng nissan passenger vehicle co technical center

Based on the mechanics model of 48 V battery under C-NCAP collision condition,the layout under the co-driver’s seat,the "three-point" fixing scheme and the " pull rod" constraint structure were *** by using the static theory,the lowcost material strength and plate thickness were *** CAE simulation and C-NCAP vehicle test,the constraint effectiveness of the structure design under the collision condition was *** on this design,about 10 L of luggage space was saved,50% of layout cost was cut down and 1.5 kg of vehicle weight was lightened.

关键词： vehicle 48V battery collision structure design

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Design Modification of vehicle Body Structure for Wiper System Waterproof Performance

Design Modification of Vehicle Body Structure for Wiper Syst...

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2021中国汽车工程学会年会暨展览会

作者： Yan Jianrong Zhu Kongying Huang Xiaolong Chen Kaihang dongfeng Motor co. LtdDongfeng Nissan Passenger Vehicle CompanyPassenger Vehicle Technical Center

Taking the wiper system of a vehicle as the research object,the overall waterproof performance of the wiper system is *** the CFD simulation software PreonLab to simulate the water flow under the condition of car washing,and the waterproof failure state of the wiper system is *** with the simulation analysis and vehicle experiment,the drainage effect of the vehicle air box is improved,the depth of the water in the air box is reduced,and the waterproof performance of the wiper system is *** water flow simulation analysis of PreonLab can well support the waterproof performance design of wiper system.

关键词： wiper system waterproof performance preonlab water flow

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Online Perception Performance Estimation for Autonomous Driving vehicles

Online Perception Performance Estimation for Autonomous Driv...

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2022中国汽车工程学会年会暨展览会

作者： Qin Ziyu Zhang Zhao dongfeng Motor co. Ltd.Dongfeng Nissan Passenger Vehicle companyPassenger Vehicle Technical Center

Accurate estimation on the perception performance is an essential prerequisite for autonomous driving ***-ofthe-art perception models get excellent performance on existing well-labelled dataset,while suffering the lack of reliable confidence in varying *** paper is dedicated to investigate an online perception performance estimation,in particular,to calculate the precision rate of each detected object adaptively without manually labelled annotations.A parameterized relationship is constructed between the confidence output by perception models and the precision *** then the relationship can be online updated according to a robust multiple hypothesis tracking(MHT) system *** proposed method is applied on widely studied Mask-RCNN on the KITTI dataset,to get precision estimations accordant to the ground-truth in different scenarios,respectively.

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Study on the Influence Mechanism of Filiform corrosion for Aluminum Alloy Decoration in vehicle Interior Trim

Study on the Influence Mechanism of Filiform Corrosion for A...

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2021中国汽车工程学会年会暨展览会

作者： Zhang Mengying Yang Bing Xiong Huangao dongfeng Motor co. Ltd.Dongfeng Nissan Passenger Vehicle CompanyPassenger Vehicle Technical Center

The A8014 Aluminum Alloy decoration is studied to analyze the reason of filiform corrosion,and confirm the influence rule through Libai dishwashing mixed liquid clean the surface door trim in customer daily *** effect factors are brushing process,film thickness,the coating on cut section,matching chrome at the accelerated *** base on the microstructure analysis,the four factors are analyzed for the influence mechanism of filiform corrosion,which provides a reference for the development of interior Al decoration.

关键词： filiform corrosion brushing process film thickness influence mechanism

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The vehicle Structure Response and Dummy Injury Research Based on C-IASI and C-NCAP Side-Impact conditions

The Vehicle Structure Response and Dummy Injury Research Bas...

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2020中国汽车工程学会年会暨展览会

作者： Li Wanli Zhou Chengjing Chen Gaojun Zheng Peichi dongfeng nissan passenger vehicle company technical center

In this paper,the differences between the 2017 version of C-IASI and the 2018 version of C-NCAP are analyzed *** on the side impact test results of an SUV model under both evaluation methods,the differential analysis is carried out from the aspects of MDB quality,MDB posture and impact position,and the vehicle body response as well as dummy injury were compared based on the above difference *** results show that with the same SUV model structure,the deformation of the front door structure under C-IASI evaluation test is significantly worse than that of C-NCAP,while the rear door structure deformed *** the comparison of the margin value about dummy injury,which can been seen that C-IASI front row dummy torso damage value is higher,while the back row dummy injury value is *** research provides participation for vehicle side-impact safety performance design under different conditions.

关键词： 2017 C-IASI 2018 C-NCAP side-impact vehicle structure response dummy injury

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Study of the Response of the Front-Row Far Side Dummy under vehicle Side Impact condition

Study of the Response of the Front-Row Far Side Dummy under ...

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2021中国汽车工程学会年会暨展览会

作者： Chen Zixiao Wang Yanhao Li Wanli Chen Gaojun Zhou Chengjing dongfeng nissan passenger vehicle company technical center

The text is based on the AE-MDB side impact condition of a certain SUV *** at two 50 th male dummies,ES-Ⅱ and WorldSID50,the CAE simulation analysis method is used to study the difference in the motion posture and injury value of this two *** research results show that due to the difference in the quality and size of the dummy,the motion posture of the head and pelvis of the far side dummy is *** them,the head and upper torso of the ES-Ⅱ dummy move *** the performance of the damage value,the head and pelvis damage value of the two types of dummy are *** above conclusions provide references for the far side occupant protection of the vehicle side impa

关键词： side impact AE-MDB far side occupant dummy response

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Research for vehicle Idle Vibration control Based on Ball-Type constant Velocity Joint

Research for Vehicle Idle Vibration Control Based on Ball-Ty...

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2023中国汽车工程学会年会暨展览会

作者： Zhao Xu Zhang Jizhong Li Minghua Li Kangning Huang Haiming dongfeng nissan passenger vehicle company technical center

This paper aims to study an optimization design for reducing the vertical transmission force of ball-type constant velocity joint(CVJ),in order to improve vehicle idle *** the vertical transmission force of ball-type CVJ is measured by bench equipment so the correlation between vertical transmission force amplitude and excitation amplitude,loaded torque,shaft length is *** transmission force amplitude of ball-type CVJ has a positive correlation with excitation amplitude and loaded torque,while negative with shaft *** vertical transmission force resultant in wheel sides in idle condition is calculated and a vehicle experiment is proceeded to measure cabin floor vertical vibration acceleration in the same ***,an example is given to validate there is a strong linear correlation between the estimated values of vertical transmission force in wheel sides and the measured results of vehicle idle *** major factors affecting vertical transmission force of ball-type CVJ are *** transmission force can be restrained by using low friction grease,reducing ball-cage window interfere and enlarging ball pitch circle diameter(PCD)to optimize vehicle idle *** methods for vehicle idle vibration presented in this paper apply to both the oil-fueled and hybrid electric vehicles with engine.

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Experimental Investigation for NH3 Emission Characteristics of Light-Duty vehicle

Experimental Investigation for NH3 Emission Characteristics ...

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2022中国汽车工程学会年会暨展览会

作者： Li Hualong Tu Xianfeng Yu Leigang Li Hai dongfeng Motor co. Ltd.Dongfeng Nissan Passenger Vehicle companyPassenger Vehicle Technical Center

Ammonia（NH）,as one of the main components of light-duty vehicle emissions,its emission requirements are most likely to be considered in the next stage of emission regulations,with the increase in vehicle ownership and the tightening of emissions regulations ***,it is necessary to investigate the characteristics of NH3 emission in automobile exhaust in advance,which is also beneficial to reducing the secondary particulate matter in the *** this paper,the emission experiment of a lightduty gasoline vehicle was carried out under different test cycles and ambient *** emission characteristics of NH3 were *** representative conditions of NH3 formation and its associated relationship with other emission components are *** data indicated that the cold starting phase and long-term continuous acceleration are the key representative *** significantly positive correlation between the emissions of NH3 and co is ***,the emergence of NH3 is accompanied by the large production of *** the correlation of NH3 with NO or THC emissions is not obvious.

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Research on Measurement Method of Adaptive Driving Beam

Research on Measurement Method of Adaptive Driving Beam

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2020中国汽车工程学会年会暨展览会

作者： Ye Guanqun Wang Peixiang Gong Bing Gu Fangfang Tong Bingliang dongfeng Motor co. Ltd.Dongfeng Nissan Passenger Vehicle Technical Center

In recent years,adaptive driving beam has become a development trend of automobile headlight,which does not dazzle the drivers of other vehicles,and at the same time guarantees the effect of driving beam to the greatest *** paper introduces testing method detail of main performance of adaptive driving beam which required in PRC regulation standard *** order to meet customers’ needs better,four scenes and testing methods of adaptive driving beam are studied,such as detection distance for pedestrian,detection for electric bicycle light,minimum activating speed and activating under street light.

关键词： adaptive driving beam ADB LED segment testing scene

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