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Electronic Differential Control of Rear-Wheel Independent-Drive Electric Vehicle

SAE International Journal of Vehicle Dynamics, Stability, and NVH

Jiangsu University, China-Ren He, Hang Yun
  • Journal Article
  • 10-04-01-0004
Published 2019-12-02 by SAE International in United States
To track desired slip ratios and desired longitudinal speeds at the centers of driving wheels in the curve, this article proposes a hierarchical structured electronic differential control (EDC) of rear-wheel independent-drive electric vehicle (EV). In the high-level control, a fuzzy algorithm-based coefficient is computed according to the driver’s emotional intention of acceleration. The fuzzy algorithm-based coefficient is used to correct the desired driving torque of vehicle transmitting to the medium-level control. In the medium-level control, an optimization algorithm is developed to allocate the desired torques with requirement of as much accurate yaw moment as possible by the desired driving torque of the vehicle and yaw moment. And the desired longitudinal speeds at the centers of the rear left and right wheels are corrected twice, respectively, by Ackermann steering principle, considering the slip angle of the wheel and yaw moment. Based on the desired torques and desired longitudinal speeds at the centers of the rear left and right wheels from the medium-level control, desired slip ratios and desired angular speeds of the rear left and right…
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Modeling and Simulation of Refueling Emissions from Plug-in Hybrid Electric Vehicles

SAE International Journal of Fuels and Lubricants

Jiangsu University, China-Shu Liu, Ren He
  • Journal Article
  • 04-12-03-0014
Published 2019-10-14 by SAE International in United States
Vehicular evaporative emissions are an important source of volatile organic compounds (VOCs). Moreover, the engines of plug-in hybrid electric vehicles (PHEVs) may not start for a long time, causing the activated carbon canister to not purge well in-use and to become saturated with fuel vapor. Therefore, the problems of evaporative emissions and refueling emissions of PHEVs are still severe. The objectives of this article are to model and simulate the refueling emissions from PHEVs to shorten the design and development cycle. To achieve the goals, the release of refueling emissions is divided into two stages: the depressurization stage and the refueling stage. The mathematical model has been established by means of the ideal gas law and the gas mass transfer and diffusion law. Then, the numerical model is built and the volume of fluid (VOF) model was applied in the simulation. Moreover, the numerical model was validated by experiment on internal pressure increase of the fuel tank. The baseline case is conducted under the condition that the fuel dispensing rate is 50 L/min. Finally, different…
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Prediction and Control of Response Time of the Semitrailer Air Braking System

SAE International Journal of Commercial Vehicles

Jiangsu University, China-Ren He, Chang Xu
  • Journal Article
  • 02-12-02-0011
Published 2019-05-09 by SAE International in United States
The response time of the air braking system is the main parameter affecting the longitudinal braking distance of vehicles. In this article, in order to predict and control the response time of the braking system of semitrailers, an AMESim model of the semitrailer braking system involving the relay emergency valve (REV) and chambers was established on the basis of analyzing systematically the working characteristics of the braking system in different braking stages: feedback braking, relay braking, and emergency braking. A semitrailer braking test bench including the brake test circuit and data acquisition system was built to verify the model with typical maneuver. For further evaluating the semitrailer braking response time, an experiment under different control pressures was carried out. Experimental results revealed the necessity of controlling the response time. As a result, a braking pressure compensation system was designed through adding intake and exhaust solenoid valves to the original braking system. A proportional-integral-derivative (PID) control strategy optimized by genetic algorithm (GA) was adopted to generate pulse width modulation (PWM) signals applied to the solenoid valves…
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Simulation on Thermal-Stress-Fatigue of an Engine Exhaust Manifold

Jiangsu University, China-Fei Dong, Qinyin Fan, Chenhai Guo, Shuli Jiang, Yixi Cai
Cybernet Systems Co., Ltd.-Akio Miyori, Saji Washio
Published 2009-04-20 by SAE International in United States
Because of the contradictions of the downsizing and the serious thermal-load of modern engine, thermal fatigue failure of the engine components easily happens due to excessive temperature gradient and thermal stress. During recent years, with the constantly advancing progress of high performance computer technology, many CFD software codes provide the ability to solve, or take part in the best possible solution of FVM/FEM coupled problems, and Fluid Structure Interaction (FSI) analyses have been developed. However, the unidirectional coupling of thermal flow and thermal stress as well as structural fatigue failure analyses in IC engine applications, especially transient case, has received less attention. In this paper, authors have studied unidirectional FSI in depth, including that transient high speed and high temperature flow strongly affects the engine exhaust manifold. These researches can be used in protection certain fatigue failures for general purpose. And CFD and FEA code adopted respectively is SC/Tetra and ANSYS.
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Numerical Analysis of Initial Shape of Nozzle Inject Flow

SAE International Journal of Passenger Cars - Mechanical Systems

Jiangsu University, China-Qinyin Fan, Chenhai Guo
Osaka Sangyo University, Japan-Kikuo Narumiya, Hiroshi Hattori
  • Journal Article
  • 2008-01-0243
Published 2008-04-14 by SAE International in United States
At the initial stage of injection, the inject flow has not yet broken up and in a range of small atmosphere pressure (16∼500KPa), the tip of the inject flow always forms a shape of mushroom. And the umbrella of the mushroom is always very big and the root of it is always very thin, especially when the atmosphere pressure is relatively low (88KPa, or 100mmHg) (1)(2). These phenomena are not known popularly and the reason of mushroom formation is not clear. In this paper, with MARS (Multi-interfaces Advection and Reconstruction Solver) method (3)(4)(5)for simulating free surface, analysis of inject flow is practiced. The phenomena are reproduced and the reason is cleared that the formation of the mushroom is induced by the momentum exchange between the very high speed fuel flow and the very complex air flow.
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Simulation of Dynamic Characteristics of Hydraulic Power Steering System of Vehicles

Jiangsu University, China-Wang Ruo-Ping
Published 2007-08-05 by SAE International in United States
The dynamic characteristics of the hydraulic power steering system(HPSS) are simulated and discussed with SIMULINK software and hydraulic control theory. The characterristic of software SIMULINK is introduced and the dynamical model of valve-controlled hydraulic cylinder is constructed. The dynamic simulation can be made by establishing the dynamic model and the simulation model of HPSS, initializing the parameters of the system, and implementing the dynamic simulation. Lastly, the key factors affecting the dynamic characteristics of HPSS are discussed. The simulation result can provide theoretical basis for designing HPSS and the SIMULINK method is an effective way to simulate the dynamical characteristics of HPSS.
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Analysis of Impact Test of Aluminum Disc Wheels Based on FEM

Jiangsu University, China-Maotao Zhu, Bing Han
Published 2007-08-05 by SAE International in United States
Aluminum disc wheels have to pass impact test before going into production. Impact test of “15×6J” wheel is analyzed with CAE technology, representing the application of finite element method on simulation of impact problems. In numerical simulation of wheel impact test, integrated finite element model is established, including impact block, wheel, tyre and bracket. The whole process of impact is simulated, and velocity and displacement curves of impact block and wheel stress distribution are obtained. The analysis results indicate the wheel can pass the impact test, which is validated by the physical experimentation.
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