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Research on the adaptability of vehicles with different technical types to the China 6 regulation standard

CATARC-Feng Yan
  • Technical Paper
  • 2019-01-0759
To be published on 2019-04-02 by SAE International in United States
A test fleet formed of 47 gasoline vehicles with 6 different technical types was organized, and the adaptability of these vehicles under China 6 standard was studied. By analyzing the performance of the vehicles tested in laboratory and in real-world, the technical types that could simultaneously reconcile emission and fuel consumption performance were proposed. The results show that all vehicles are well performed under laboratory conditions, but in real-world conditions, 50% direct injection vehicles without GPF would fail the RDE test. Better performance occurred in vehicles equipped with GPF, all of which passed the RDE tests even if the conformity factor decreased from 2.1 to 1. In addition, it is found that the fuel consumption of the DI vehicle were lower than that of the PFI vehicle, and the DI vehicle with GPF shows better performance on the balance of emission and fuel consumption, which have more potentials to deal with the increasing tightened emission and fuel consumption standards at the same time.

Research on Key Factors for Range and Energy Consumption of Electric Vehicles

Chongqing Changan New Energy Auto Co.Ltd-Chen Zhao, Guan Gong, Cheng Yu, Ying Liu, Shu Zhong, Yanxing song, Chenghao Deng, Anjian Zhou, Honglu Ye
  • Technical Paper
  • 2019-01-0723
To be published on 2019-04-02 by SAE International in United States
Investigations have been carried out to examine the potential to optimize the energy consumption and drive range of the Electric Vehicles (EV). Theoretically, the energy consumption is strongly influenced by system efficiency, coasting resistance and energy recovery technology. In this paper, these three aspects have been studied in detail through both simulation tool and experimental test. Research has been conducted on a Changan sedan EV to explore the influence of each factor on the energy consumption and drive range. The most paramount factor is the vehicle coasting resistance, followed by the power-train system efficiency. To reduce the coasting resistance, interests can be drawn to the application of tire with low resistance coefficient, low friction brake clamp and the modification of vehicle styling. The drive-train efficiency includes the motor efficiency, inverter efficiency and the gearbox efficiency. Interestingly, the effect of energy recovery technology is sensitive to the driving conditions. The I-pedal technology which can supply deceleration up to 0.2g has little influence over NEDC but can extend the range over real-world driving by up to 10%…

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.

Research on the different behavior of edge cracking limit by adopting the laser cutting method

Oakland University-Junrui Li, Wan Xu, Boyang Zhang, Lianxiang Yang
  • Technical Paper
  • 2019-01-1264
To be published on 2019-04-02 by SAE International in United States
The edge fracture occurs more frequently during the forming procedure by using the material with higher strength. To avoid the edge fracture that happens during the manufacturing, the edge cracking limit at different pre-strain level needs to be determined. The edge of the part under forming is conventionally manufactured by mechanical cutting, and the edge cracking limit under this circumstance is already heavily studied. In recent years, laser cutting is more applied in the automotive industry to cutting the edge due to the following advantages over mechanical cutting: easier work holding, higher precision, no wearing, smaller heat-affected zone, etc. The change cutting method could lead to a different behavior to the edge cracking limit at different pre-strain level. In this paper, the edge cracking limits of sets of pre-strained coupons with different pre-strain levels are tested. Half of them is cut by the conventional punch method, and the other half uses laser cutting. These cut pre-strained half dog-bone coupons are loaded under a uniaxial tension to acquire the edge cracking limit. The thinning strain is…

Analysis and optimization for E-coating Holes of an SUV

ASCL of Jilin University-Yingchao Zhang
South East (Fu Jian) Motor-Yi Chen, Mingyang Song, Fengmiao Yu, Qing Xu, Ji Chen
  • Technical Paper
  • 2019-01-0802
To be published on 2019-04-02 by SAE International in United States
In view of the problem of substandard film thickness frequently occurring in the A pillar, In this paper, ECoatMaster was used to conduct electrophoresis simulation analysis on A pillar of an SUV, By calculating the distribution of macro film thickness of the car body, the results of the section of A pillar were intercepted and imported into the micro module to explore the relationship between the opening radius and the thickness of the electrophoretic coating and the influence range of the coating. found that when the pore diameter gradually changes from R6 to R10, film thickness increase significantly, the basic linear increase; When the pore diameter gradually changes from R10 to R14, the film thickness increases correspondingly, but the film thickness increases gradually. At the same time, in order to investigate the relationship between different pore diameters and the influence range of coating film, the influence range of five different pore diameters was compared. Similarly, when the pore diameter was gradually changed from R6 to R10, the influence range was significantly increased, with a maximum…

Analysis of the pressure loss increase mechanism by Ash accumulated of coated GPF

Honda R&D Co., Ltd.-Noritaka Masumitsu, Shinichiro Otsuka, Ryoko Fujikura, Yusuke imai, Tetsuo Endo
  • Technical Paper
  • 2019-01-0981
To be published on 2019-04-02 by SAE International in United States
At accelerating exhaust gas regulations during recent years, not only are CO / HC / NOx getting stricter, but so are PN regulations, as represented by Euro 6 d and China 6. PN reduction by engine combustion technology development also progresses, but considering RDE (real driving emissions), PN reduction by after treatment technology is also indispensable. To reduce PN exhausted from a gasoline engine, it is effective to equip a GPF (gasoline particulate filter) to have a filter structure. We have so far developed a system to replace the TWC (three-way catalyst) of the rear bed with a GPF in order to mount the GPF without changing the layout of the TWC 2 bed system. We chose a coated GPF with filter function and TWC function. Since the amount of washcoat and the initial pressure loss are in conflicting relation with the coated GPF, we developed a coated GPF that can achieve both low initial pressure loss and high purification performance. Although GPF can collect PM, Ash derived from the engine oil component accumulates and…

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…

Effect of Injection Pressures on Nozzle Internal Flow and Jet Breakup under Sub-cooled and Flash Test Conditions

Shanghai Jiao Tong Univ-Xuesong Li, Min Xu
Shanghai Jiao Tong Univ.-Shangze Yang
  • Technical Paper
  • 2019-01-0286
To be published on 2019-04-02 by SAE International in United States
Injection pressure paly a vital role in spray break-up and atomization. High spray injection pressure is adopted to optimize spray atomization in GDI system. At the same time, higher injection pressure also leads to engine wall wetting related emission problem. To solve this problem, researches trying to use flash boiling to dominate the spray atomization processes under lower injection test conditions. However, the effect of injection pressures on the spray atomization under flash boiling test conditions has not been adequately investigated yet. In this study, quantitative study of internal flow and near nozzle spray breakup were carried out based on a two-dimensional transparent nozzle via microscopic imaging. N-hexane was chosen as test fluid with different injection pressures. Fuel temperature varied from 63℃ to 138℃, which covered a wide range of superheated conditions. Ambient pressure was kept as 1 bar. With the experiments, the effect of injection pressures on nozzle internal flow and jet break-up is analyzed. As results, increasing injection pressures leads to better near nozzle spray break-up under sub-cooled test conditions. Under flash boiling…

Reliable Processes of Simulating Liner Roughness and Its Lubrication Properties

Massachusetts Institute of Technology-Renze Wang, Chongjie Gu, Tian Tian
  • Technical Paper
  • 2019-01-0178
To be published on 2019-04-02 by SAE International in United States
Topology of liner finish is critical to the performance of internal combustion engines. Proper liner finish simulation processes lead to efficient engine design and research. Fourier methods have been well studied to numerically generate liner topology. However, four major issues wait to be addressed to make the generation processes feasible and reliable. First, in order to simulate real plateau honed liners, approaches should be developed to calculate accurate liner geometric parameters. These parameters are served as the input of the generation algorithm. Material ratio curve, the common geometry calculation method, should be modified so that accurate root mean square of plateau height distribution could be obtained. Second, the set of geometric parameters used in generating liner finish (ISO 13565-2) is different compared with the set of parameters used in manufacturing industry (ISO 13565-3). Quantitative relations between these two sets should be studied. Third, numerically generated liners should be run in deterministic lubrication, dry contact, and engine cycle models. Their output should be compared with corresponding real liners. Last but not least, currently most liner generation…