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A New Technology of Concentricity Measurement Based on CMM

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A New Technology of Concentricity Measurement Based on CMM

2023中国汽车工程学会年会暨展览会

作者： Dai Yunfeng Zhu Guiping Cui Bin Zhu Yi dongfeng commercial vehicle technical center

This paper analyzes the deviation of concentricity measured by coordinate measuring machine(hereinafter referred to as CMM).We can select a better measurement system and sampling strategy,so as to improve the accuracy of concentricity measured by CMM to the greatest *** is the first time to put forward the concept of uncertainty in measuring concentricity with different CMM under specific *** paper analyzes the advantages and disadvantages of various flexible measurement methods,also point out the calculation defects of common axis method and straightness method and the possibility of ***,the author summarizes the experience of measuring concentricity with CMM.

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The Study of vehicle Dynamics Modeling Method Based on the Characteristics of Suspension and Steering Systems

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The Study of Vehicle Dynamics Modeling Method Based on the C...

2015中国汽车工程学会年会

作者： Wei Chen Zhe Sun Xian Xu Xurong Yi Yingxiong Zhang dongfeng commercial vehicle technical center

This paper analyzes the relationship between suspension and steering systems and wheels,and proposes the vehicle dynamics modeling *** with suspension K＆C and handling test of a concrete car,the accuracy is *** simulation results shows that the method is correct and feasible,and the dynamics model by using this method which can characterize the suspension and steering systems with high precision can be used for the follow-up simulation and optimization.

关键词： suspension steering vehicle dynamics adams/view

Lightweight Design of Suspension Balance-Axle Bracket Based on Nonlinear Strength Simulation and Experiment

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Lightweight Design of Suspension Balance-Axle Bracket Based ...

2023中国汽车工程学会年会暨展览会

作者： Su Huan Ding Peilin Lang Baoyong Wang Chengen Yi Jianwu Liu Daoyong dongfeng commercial vehicle technical center

In order to cope with market changes,a certain commercial vehicle platform balance suspension system urgently needs to be lightweight to reduce *** suspension system is faced with a series of contact nonlinear problems of complex *** structure obtained by traditional simplified design and simulation methods often breaks in the test verification,which is much different from the ***,according to the contact numerical algorithm of the software,this paper considers the nonlinear characteristics of suspension strength in modeling,conducts electrical test and simulation benchmarking with the production process of actual cold assembly of the factory,and finally summarizes the adjustment methods of various parameters and convergence characteristics of contact nonlinear analysis,and forms a set of nonlinear strength simulation analysis methods suitable for suspension *** method laid an important foundation for the subsequent lightweight design work,and the lightweight balanced suspension system after multiple rounds of simulation optimization successfully passed the bench and vehicle reliability tests,and the lightweight suspension was successfully put on the market and obtained great economic value.

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Ride Comfort Simulation and Abnormal Vibration Improvement of a commercial vehicle

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Ride Comfort Simulation and Abnormal Vibration Improvement o...

2015中国汽车工程学会年会

作者： Xian Xu Feng Yan Yang Li Wei Chen Yuan Cao dongfeng commercial vehicle technical center

In order to improve the commercial vehicle ride comfort,a virtual prototype model of the vehicle based on ADAMS/View was established and random road excitation was used as input in the following *** solve the abnormal vibration of the vehicle,the damping of shock absorber and the parameters of cab suspension system were *** last,the correctness of the optimization was verified on a test vehicle.

关键词： ride comfort spectral analysis abnormal vibration

Performance Limit Evaluation Strategy for Automated Driving Systems

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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

Optimization of Engine Control Strategies for Low Fuel Consumption in Heavy-Duty commercial vehicles

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Computer Modeling in Engineering & Sciences 2023年第12期137卷 2693-2714页

作者： Shuilong He Yang Liu Shanchao Wang Liangying Hu Fei Xiao Chao Li School of Mechanical and Electrical Engineering Guilin University of Electronic TechnologyGuilin541004China Technology center of commercial vehicle Dongfeng Liuzhou Motor Co.Ltd.Liuzhou545005China

The reduction of fuel consumption in engines is always considered of vital *** these lines,in this work,this goal was attained by optimizing the heavy-duty commercial vehicle engine control *** specifically,at first,a general first principles model for heavy-duty commercial vehicles and a transient fuel consumptionmodel for heavy-duty commercial vehicles were developed and the parameters were adjusted to fit the empirical *** accuracy of the proposed modelwas demonstrated fromthe stage and the final ***,the control optimization problem resulting in low fuel consumption in heavy commercial vehicles was described,with minimal fuel usage as the optimization goal and throttle opening as the control ***,a time-continuous engine management approach was ***,the factors that influence low fuel consumption in heavy-duty commercial vehicles were systematically *** reduce the computing complexity,the control strategies related to the time constraints of the engine were parametrized using three different *** most effective solution was obtained by applying a global optimization strategy because the constrained optimization problem was ***,the effectiveness of the low-fuel consumption engine control strategy was demonstrated by comparing the simulated and field test results.

关键词： Fuel consumption heavy-duty commercial vehicle engine control optimal control

Real-Time Co-optimization of Gear Shifting and Engine Torque for Predictive Cruise Control of Heavy-Duty Trucks

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Chinese Journal of Mechanical Engineering 2024年第2期37卷 294-317页

作者： Hongqing Chu Xiaoxiang Na Huan Liu Yuhai Wang Zhuo Yang Lin Zhang Hong Chen School of Automotive Studies Tongji UniversityShanghaiChina Department of Engineering University of CambridgeCambridgeUK State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchunChina Qingdao Automotive Research Institute Jilin UniversityQingdaoChina dongfeng commercial vehicle Technology center Dongfeng Motor CorporationWuhanChina

Fuel consumption is one of the main concerns for heavy-duty *** cruise control(PCC)provides an intriguing opportunity to reduce fuel consumption by using the upcoming road *** this study,a real-time implementable PCC,which simultaneously optimizes engine torque and gear shifting,is proposed for heavy-duty *** minimize fuel consumption,the problem of the PCC is formulated as a nonlinear model predictive control(MPC),in which the upcoming road elevation information is *** the solution of the nonlinear MPC is time consuming;thus,a real-time implementable solver is developed based on Pontryagin’s maximum principle and indirect shooting *** programming(DP)algorithm,as a global optimization algorithm,is used as a performance benchmark for the proposed ***,hardware-in-the-loop and real-truck experiments are conducted to verify the performance of the proposed *** results demonstrate that the MPC-based solution performs nearly as well as the DP-based solution,with less than 1%deviation for testing ***,the proposed co-optimization controller is implementable in a real-truck,and the proposed MPC-based PCC algorithm achieves a fuel-saving rate of 7.9%without compromising the truck’s travel time.

关键词： Heavy-duty truck Predictive cruise control Model predictive control Pontryagin’s maximum principle Real-truck implementation

Light weighting opportunities and material choice for commercial vehicle frame structures from a design point of view

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Advances in Manufacturing 2015年第1期3卷 19-26页

作者： Peter Seyfried Ed Juarez Mendes Taiss Alexandre Costa Calijorne Fei-Peng Li Qi-Feng Song Hamburg University of Applied Sciences Hamburg Germany Companhia Brasileira de Metalurgia e Mineracao Villa NovaMGBrazil Caltra Projetos & Consultoria Belo HorizonteMGBrazil dongfeng commercial vehicle Technology center FAW Technology center

This paper focuses on an estimation of light weighting opportunities for the frame structure of com- mercial road vehicles. This estimation is based on simpli- fied static load cases which play a predominant role for the dimensioning of a frame structure and therefore these simplifications are not putting the general validity of the conclusions into question. A comparison of different ma- terials under this scenario shows that light metals do not show any weight reduction advantage in comparison to steel while a material-independent topology optimization has more weight reduction potential for the frame structure than a simple change of materials. Considering the con- straints of part complexity which is directly linked with production and assembly cost, the ladder frame structure has become the current state of the art design. Thus the paper also puts a spotlight on basic rules of node design and vertical load induction in order to keep the weight of such a design as low as possible. Practical examples from manufacturers show that the weight of a commercial vehicle could be reduced by 10%, and main parts of the frame structure could be reduced by 30% using high strength steel in combination with innovative production methods like roll forming.

关键词： Ladder frame . Light weighting.commercialvehicle .Node design - High strength steel - Profilesection . Vertical bending .Topology optimization

Diagnostic Analysis and Improvement of a Chinese Ⅵ Engine with Abnormal Noise in EGR System

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Diagnostic Analysis and Improvement of a Chinese Ⅵ Engine w...

2021中国汽车工程学会年会暨展览会

作者： Xu Chenghui Tan Zhengyu Chen Leilei Ouyang Fengxia technical center of dongfeng commercial vehicle Co. Ltd.

The abnormal noise on the exhaust side of a Chinese VI engine under low load condition was diagnosed by the engine acoustic testing technology in the *** on the theoretical analysis that the non-uniformity of air flow field could produce high-frequency vortex noise,the structural optimization design and computational fluid dynamics simulation of EGR system were carried out to improve the flow field uniformity in EGR *** retest results showed that the abnormal noise at the exhaust side was eliminated,which provided a reference for the diagnosis and improvement of engine components with abnormal noise.

关键词： abnormal noise computational fluid dynamics vortex noise EGR bellows