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Application of a Hydrogen-Based Fuel: Synergistic Effects of Hho Negative-Pressure Indraft and Lean-Burn on Combustion and Emission of Gasoline Port Injection Engine

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SSRN 2024年

作者： Yu, Xiumin Hu, Junhan Zhao, Zhe Sun, Ping Li, Ming Liu, Yu Li, Yinan Wang, Tianqi State Key Laboratory of Automotive Simulation and Control Jilin University Changchun130022 China College of Automotive Engineering Jilin University Changchun130022 China China Automotive Technology and Research Center Tianjin300300 China

Lean-burn can effectively enhance the high-efficiency and clean combustion capability of spark-ignition (SI) engines. However, the operational stability of pure gasoline engines under lean-burn conditions deteriorates, and misfiring may even occur. To address this issue, this study modifies the engine's air intake system and fuel supply system to achieve the coupling of gasoline port injection (GPI) and HHO negative-pressure indraft (HNI). By blending the zero-carbon clean fuel HHO, the HNI+GPI engine exhibits enhanced lean-burn *** λ=1.1, HHO=16L/min, Pmax is increased by about 3.81%, APmax is reduced by about 22.79%, TPN drops to the lowest value of 9660n/cc, which exhibits a remarkable decrease of 96.79% in comparison to the baseline engine. Meanwhile, the BSFC reaches its lowest value of 335.64g/(kW·h), decreasing by about 4.90%. At λ=1.1, the BTE peaks, showing an average improvement of about 4.37% over the baseline engine, while CO is reduced by approximately 88.51%. The optimal λ value for HC emissions decreases from 1.3 to 1.2 with the increase in HNI. Besides, NOx significantly decreases under super lean-burn conditions, and even with HHO=16 L/min. In summary, HNI can effectively optimize the lean-burn characteristics and combustion stability of the engine, and also broaden its lean-burn limit. © 2024, The Authors. All rights reserved.

关键词： Gasoline

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A Resilient control Strategy in Connected Vehicles under Actuator Attacks 7

A Resilient Control Strategy in Connected Vehicles under Act...

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7th CAA International Conference on Vehicular control and Intelligence, CVCI 2023

作者： Li, Kai Wang, Yulei Chen, Hong Gao, Jinwu State Key Laboratory of Automotive Simulation and Control The Department of Control Science Jilin University Changchun China School of Electronics and Information Engineering Tongji University Shanghai China The Department of Control Science Jilin University School of Electronics and Information Engineering Tongji University Shanghai China

ISBN: (纸本)9798350340488

With the promotion of advanced communication technology, autonomous vehicle platoons (AVPs) develop rapidly due to their advantages in enhancing traffic efficiency, road safety and reducing fuel consumption. However, as cyber physical systems, AVPs are very vulnerable to malicious attacks. In this paper, we propose a novel resilient control scheme to detect and tolerate a malicious directional actuator attack in a distributed manner which destroys the feedback control system by reversing the direction of actuator. The scheme consists of a distributed trigger mechanism with a logic-based switching criterion to detect the directional actuator attacks, and a resilient and distributed triple-step control scheme to defend against the attacks. The proposed control scheme is applied on bidirectional (BD) topology. Both global asymptotic stability and string stability of the platoon system are strictly proved via Lyapunov's stability theory. Finally, simulation results are provided to show the effectiveness of the proposed approach. © 2023 IEEE.

关键词： Autonomous vehicle platoons Directional Actuator attacks Distributed control String stability

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Applicability Analysis of Cavitation Flow Field simulation of Hydrodynamic Torque Converter Stator Under Stall Condition 9

Applicability Analysis of Cavitation Flow Field Simulation o...

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9th International Conference on Fluid Power and Mechatronics, FPM 2023

作者： Chai, Bosen Lyu, Hengsheng Pan, Jun Cong, Hao Yang, Haomin Liu, Chunbao School of Mechanical and Aerospace Engineering Jilin University State Key Laboratory of Automotive Simulation and Control Jilin China Chongqing Research Institute of Jilin University Chongqing China School of Mechanical and Aerospace Engineering Jilin University Jilin China

ISBN: (纸本)9798350304947

Cavitation flow field of hydrodynamic torque converter under stall condition is simulated by different numerical simulation methods based on computational fluid dynamics, the cavitation morphological characteristics of stator blade surface simulated by different turbulence models and cavitation models are compared and analyzed. The incipient area of cavitation on the stator surface is located accurately and the spatio-temporal evolution law of cavitation morphological characteristics is revealed based on the simulation post-processing results, including velocity field, pressure field, bubble volume fraction, turbulent kinetic energy changing with time. The reliability and applicability of cavitation flow field simulation methods are comprehensively evaluated through the verification of external characteristic test results. Cavitation phenomenon is first to appear on the side of stator blade head biased to suction surface, and its morphological characteristics is similar to conical shape. The prediction error of torque ratio based on Z-G-B(k-w) model is minimum, the value is 0.055%. Relatively, the prediction error of torque ratio based on S-S(k-ϵ) model is maximum, the value is 8.791 %. The prediction accuracy of pump torque coefficient is close to the experimental results, and the error is less than 5%. Z-G-B(k-ω) model has the best prediction effect. © 2023 IEEE.

关键词： Computational fluid dynamics

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A review of gas-phase chemical mechanisms commonly used in atmospheric chemistry modelling

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Journal of Environmental Sciences 2023年第1期123卷 522-534页

作者： Yanhui Liu Jiayin Li Yufang Ma Ming Zhou Zhaofeng Tan Limin Zeng Keding Lu Yuanhang Zhang State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Science and EngineeringPeking UniversityBeijing 100871China Institute of Energy and Climate Research IEK-8:TroposphereForschungszentrum Jülich GmbHJülich 52428Germany

The atmospheric chemical mechanism is an essential component of airshed models used for investigating the chemical behaviors and impacts of *** the first tropospheric chemical mechanism was proposed in the 1960s,various mechanisms including Master Chemical Mechanism(MCM),Carbon Bond Mechanism(CBM),statewide Air Pollution Research Center(SAPRC)and Regional Atmospheric Chemistry Mechanism(RACM)have been developed for different research *** work summarizes the development and applications of these mechanisms,introduces their compositions and lumping methods,and compares the ways the mechanisms treat radicals with box model *** can reproduce urban pollution events with relatively low cost compared to SAPRC and RACM,whereas the chemical behaviors of radicals and the photochemical production of ozone are described in detail in *** photolysis rates of some oxygenated compounds are low in SAPRC07,which may result in underestimation of radical *** an explicit chemical mechanism,MCM describes the chemical processes of primary pollutants and their oxidation products in *** can be used to investigate certain chemical processes;however,due to its large size,it is rarely used in regional model simulations.A box model case study showed that the chemical behavior of OH and HO_(2)radicals and the production of ozone were well described by all *** and SAPRC underestimated the radical levels for different chemical treatments,leading to low ozone production values in both *** and RACM are widely used in box model studies,while CBM and SAPRC are often selected in regional simulations.

关键词： Atmospheric chemistry Gas-phase chemical mechanism Ozone Box model

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Robust trajectory tracking control for autonomous vehicle subject to velocity-varying and uncertain lateral disturbance

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Archives of Transport 2021年第1期57卷 7-23页

作者： WANG, Yuqiong GAO, Song WANG, Yuhai WANG, Pengwei ZHOU, Yingchao XU, Yi School of Transportation and Vehicle Engineering Shandong University of Technology China State Key Laboratory of Automotive Simulation and Control Jilin University China Qingdao Automotive Research Institute Jilin University China

Autonomous vehicles are the most advanced intelligent vehicles and will play an important role in reducing traffic acci-dents, saving energy and reducing emission. Motion control for trajectory tracking is one of the core issues in the field of autonomous vehicle research. According to the characteristics of strong nonlinearity, uncertainty and changing longitudi-nal velocity for autonomous vehicles at high speed steering condition, the robust trajectory tracking control is studied. Firstly, the vehicle system models are established and the novel target longitudinal velocity planning is carried out. This velocity planning method can not only ensure that the autonomous vehicle operates in a strong nonlinear coupling state in bend, but also easy to be constructed. Then, taking the lateral location deviation minimizing to zero as the lateral control objective, a robust active disturbance rejection control path tracking controller is designed along with an extended state observer which can deal with the varying velocity and uncertain lateral disturbance effectively. Additionally, the feedfor-ward-feedback control method is adopted to control the total tire torque, which is distributed according to the steering characteristics of the vehicle for additional yaw moment to enhance vehicle handing stability. Finally, the robustness of the proposed controller is evaluated under velocity-varying condition and sudden lateral disturbance. The single-lane change maneuver and double-lane change maneuver under vary longitudinal velocity and different road adhesions are both simulated. The simulation results based on Matlab/Simulink show that the proposed controller can accurately observe the external disturbances and have good performance in trajectory tracking and handing stability. The maximum lateral error reduces by 0.18 meters compared with a vehicle that controlled by a feedback-feedforward path tracking controller in the single-lane change maneuver. The lateral deviation is

关键词： Velocity

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Speed planning and energy management strategy of hybrid electric vehicles in a car-following scenario

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control Theory and Technology 2022年第2期20卷 185-196页

作者： Shengyan Hou Hong Chen Yu Zhang Jinwu Gao State Key Laboratory of Automotive Simulation and Control Jilin UniversityChangchun 130022JilinChina Department of Control Science and Engineering Jilin UniversityChangchun 130025JilinChina Department of Control Science and Engineering Tonji UniversityShanghai 200092China Suzhou Zhito Technology Co. Ltd.Suzhou 215129JiangsuChina

The development of intelligent connected technology has brought opportunities and challenges to the design of energy management strategies for hybrid electric ***,to achieve car-following in a connected environment while reducing vehicle fuel consumption,a power split hybrid electric vehicle was used as the research object,and a mathematical model including engine,motor,generator,battery and vehicle longitudinal dynamics is ***,with the goal of vehicle energy saving,a layered optimization framework for hybrid electric vehicles in a networked environment is *** speed planning problem is established in the upper-level controller,and the optimized speed of the vehicle is obtained and input to the lower-level ***,after the lower-level controller reaches the optimized speed,it distributes the torque among the energy sources of the hybrid electric vehicle based on the equivalent consumption minimum *** simulation results show that the proposed layered control framework can achieve good car-following performance and obtain good fuel economy.

关键词： Hybrid electric vehicle Car-following Speed planning Energy management strategy

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A novel electro-Fenton hybrid system for enhancing the interception of volatile organic compounds in membrane distillation desalination

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Journal of Environmental Sciences 2024年第4期138卷 189-199页

作者： Hongxin Liu Kuiling Li Kunpeng Wang Zhiyong Wang Zimou Liu Sichao Zhu Dan Qu Yu Zhang Jun Wang State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Environment Simulation and Pollution Control School of Environment Tsinghua UniversityBeijing 100084China School of Chemical and Environmental Engineering Beijing CampusChina University of Mining and TechnologyBeijing 100083China Beijing Key Lab for Source Control Technology of Water Pollution College of Environmental Science and EngineeringBeijing Forestry UniversityBeijing 100083China

Membrane distillation(MD)is a promising alternative desalination technology,but the hydrophobic membrane cannot intercept volatile organic compounds(VOCs),resulting in aggravation in the quality of *** term of this,electro-Fenton(EF)was coupled with sweeping gas membrane distillation(SGMD)in a more efficient way to construct an advanced oxidation barrier at the gas-liquid interface,so that the VOCs could be trapped in this layer to guarantee the water quality of the *** the so-called EF-MD process,an interfacial interception barrier containing hydroxyl radical formed on the hydrophobic membrane *** contributed to the high phenol rejection of 90.2% with the permeate phenol concentration lower than 1.50 mg/*** interceptions can be achieved in a wide temperature range,even though the permeate flux of phenol was also *** EF-MD system was robust to high salinity and could electrochemically regenerate ferrous ions,which endowed the long-term stability of the *** novel EF-MD configuration proposed a valuable strategy to intercept VOCs in MD and will broaden the application of MD in hypersaline wastewater treatment.

关键词： Membrane distillation VOC interception Interfacial oxidation Electro-Fenton Hypersaline wastewater

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Torsional Adaptive control of Motor Drive Process in Planetary Multi Speed Hybrid Power System

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SSRN 2023年

作者： Song, Dafeng Bi, Daokun Zeng, Xiaohua Wang, Zhenwei College of Automotive Engineering Jilin University Changchun130025 China State Key Laboratory of Automotive Simulation and Control Jilin University Changchun130025 China

This paper proposes a hybrid adaptive torsional vibration control algorithm, aiming to improve the torsional vibration of planetary multi speed hybrid power systems. Firstly, a torque reconstruction and feedback control algorithm as the basic method for torsional vibration adaptive control is developed based on the theory of non-identical phase superposition. Secondly, based on methods such as offline optimization using particle swarm optimization algorithm, torque location identification, and weighted parameter calculation, a multi condition control parameter adaptive adjustment method is proposed. Then, an adaptive compensation algorithm for interference is designed based on the physical realization of the nominal inverse model and the Butterworth filter. The simulation and hardware in the loop test results show that the proposed hybrid adaptive torsional vibration control algorithm can significantly reduce the maximum amplitude of longitudinal acceleration and motor wheel equivalent speed difference, with improvement rates of 96.9% and 54.9%. © 2023, The Authors. All rights reserved.

关键词： Particle swarm optimization (PSO)

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A reduced Ammonia/China Stage-VI diesel mechanism for dual-fuel engine simulations: Development, validation and CFD implementation

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International Journal of Hydrogen Energy 2025年 144卷 359-373页

作者： Liping Yang Rui Wang Feng Jiang Liang Guo Sifan Li Jiqiang Zhang College of Power and Energy Engineering Harbin Engineering University Harbin 150001 China Harbin Boiler Company Limited Harbin 150046 China State Key Laboratory of Automotive Simulation and Control Jilin University Changchun 130025 China

Ammonia (NH 3 ) is a hydrogen energy carrier, and NH 3 /diesel dual-fuel engines enhance NH 3 flame propagation and combustion stability while reducing emissions. A reduced NH 3 /diesel mechanism is crucial for dual-fuel engine combustion simulation. However, previous studies using Non-dominated Sorting Genetic Algorithm II (NSGA-II) with manual selection were affected by decision-maker subjectivity. In this study, the Technique for Order Preference by Similarity to Ideal Solution (TOPSIS) was used to improve decision consistency, repeatability, and explain-ability. A novel NSGA-II/TOPSIS hybrid method was first used to develop a reduced mechanism for China Stage-VI diesel under wide engine conditions. Sensitivity analysis was used to identify the key NH 3 /diesel auto-ignition reactions. Validated against experimental data, the optimized mechanism (90 species, 400 reactions) achieved an average of 12 % higher accuracy in predicting NH 3 /China Stage-VI diesel blends ignition delay times across all tested ammonia energy ratios (10–90 %) compared to detailed mechanisms, and successfully simulated real engine combustion conditions.

关键词： Ammonia combustion Chinese diesel Multi-attribute decision-making Multi-objective optimization Reduced mechanism

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Seasonal variations of microbial community and antibiotic resistome in a suburb drinking water distribution system in a northern Chinese city

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Journal of Environmental Sciences 2023年第5期127卷 714-725页

作者： Yanchu Ke Wenjun Sun Zibo Jing Zhinan Zhao Shuguang Xie State Key Joint Laboratory of Environmental Simulation and Pollution Control College of Environmental Sciences and EngineeringPeking UniversityBeijing 100871China School of Environment Tsinghua UniversityBeijing 100084China Research Institute for Environmental Innovation(Suzhou)Tsinghua Suzhou 215163China

Antibiotic resistance genes(ARGs)are an emerging issue for drinkingwater ***,the seasonal variation of ARGs in drinking water distribution systems(DWDS)is still *** work revealed the tempo-spatial changes of microbial community,ARGs,mobile genetic elements(MGEs)co-occurring with ARGs,ARG hosts in DWDS bulk water by means of metagenome *** microbial community and antibiotic resistome varied with sampling season and ***,ammonia,chlorite and total plate count(TPC)drove the variations of microbial community ***,environmental parameters(total organic carbon(TOC),chlorite,TPC and hardness)shifted antibiotic *** and MGEs co-occurring with ARGs showed higher relative abundance in summer and autumn,which might be attributed to detached pipe *** particular,ARG-bacitracin and plasmid were the predominant ARG and MGE,*** hosts changed with season and site and were more diverse in summer and *** winter and spring,Limnohabitans and Mycobacterium were the major ARG hosts as well as the dominant genera in microbial *** addition,in summer and autumn,high relative abundance of Achromobacter and Stenotrophomonas were the hosts harboring many kinds of ARGs and MGEs at site in a residential zone(0.4 km from the water treatment plant).Compared with MGEs,microbial community had a greater contribution to the variation of antibiotic *** work gives new insights into the dynamics of ARGs in full-scale DWDS and the underlying factors.

关键词： Drinking water distribution system Seasonal change Microbial community Antibiotic resistance genes Mobile genetic elements

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