The SAE MOBILUS platform will continue to be accessible and populated with high quality technical content during the coronavirus (COVID-19) pandemic. x

Your Selections

Yang, Yang
Show Only

Collections

File Formats

Content Types

Dates

Sectors

Topics

Authors

Publishers

Affiliations

Events

   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Experimental and Computational Studies of the No-Load Churning Loss of a Truck Axle

Dana Incorporated-Steven Wesolowski
Lubrizol-Farrukh Qureshi
  • Technical Paper
  • 2020-01-1415
To be published on 2020-04-14 by SAE International in United States
This paper summarizes the work performed in predicting and measuring the contribution of oil churning to the no-load losses of a commercial truck axle at typical running speeds. A computational fluid dynamics (CFD) analysis of the churning losses was performed. The CFD modeling accounted for design geometry, operating speed, temperature, and lubricant properties. The model computed the torque loss due to oil churning due to the viscous and inertia effects of the fluid. It also displayed the flow pattern generated and computes the oil volume fraction at any location within the volume. CFD predictions of power losses were then compared with no load measurements made on a specially developed dynamometer driven test stand. The same axle that was used in the CFD model was tested in three different configurations: with axle shafts, with axle shafts removed, and with ring gear and carrier removed. This approach to testing was performed to determine the contribution of each source of loss (bearings, seals, and churning) to the total loss. After bearing and seal loss measurements and predictions were…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

The new 4-cylinder 1.5L turbocharged GDI engine from SAIC motor

SAIC Motor Technical Center-Zheng Xu, YinSheng Ping, Chuanhui Cheng, Xiaomao Zhang, Haiting Yin, WeiJun Li, DongBo Cai, ShaoMing Wang, YanJun Wang, Yang Yang, Yingzhen Wang, YaJun Zhang
  • Technical Paper
  • 2020-01-0836
To be published on 2020-04-14 by SAE International in United States
SAIC Motor Corporation Limited (SAIC Motor) has developed a new 1.5 L 4-cylinder turbocharged gasoline direct injection engine to meet the market demand and increasingly stringent requirement of CAFÉ and tail-pipe emission regulations. A series of advanced technologies for improving engine fuel economy、engine-out emission and low-end torque performance have been employed, such as: central gasoline direct injection, integrated exhaust manifold, high tumble combustion system, Miller Cycle, cooled external EGR, 35MPa fuel injection system, multi-hole injector with variable hole size design, efficient turbo charging with EWG, etc. As a result, the engine is able to achieve over 39% brake thermal efficiency (BTE), as well as substantial fuel consumption reduction in vehicle driving cycle. It also delivers 275 Nm torque staring from 1750RPM, with fast low-end torque response. By integrating the 35 MPa high pressure fuel injection system and optimized multi-hole fuel spray, the engine-out particulate numbers (PN) emission is reduced by more than 70% over a previous base engine with 20Mpa fuel injection system. And the vehicle equipped with this new engine is capable of meeting…
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Regenerative Braking Cooperative Control of Hybrid Electric Vehicle Based on System Efficiency Optimization

Chongqing University-Yang Yang, Jing Chen, Chang Luo, Qingsong Tang
  • Technical Paper
  • 2019-01-5089
Published 2019-11-19 by SAE International in United States
In order to improve the performance of electro-hydraulic composite braking system of hybrid electric vehicle (HEV), a new type of plug-in HEV with dual motor was taken as the research object. The model of motor loss was built to achieve maximum motor efficiency, and the hydraulic braking system model, which can dynamically control pressure, was built. Based on the optimization of a motor’s continuously variable transmission (CVT) joint efficiency, the real-time optimal allocation strategy based on threshold method and cooperative control strategy of the electro-hydraulic composite braking system were brought out to recover most of the regenerative energy under the premise of ensuring safety. The model was built to verify the performance by AMESim-Simulink. The results show that the control strategy can take the advantages of dual-motor braking recovery system, increase braking energy recovery rate, effectively improve the braking safety and ride comfort of the vehicle, and reduce braking force fluctuation.
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Energy-Management Strategy for Four-Wheel Drive Electrohydraulic Hybrid System with Optimal Comprehensive Efficiency

SAE International Journal of Passenger Cars - Electronic and Electrical Systems

Chongqing University, China-Yang Yang, Ke Lu, Chunyun Fu
  • Journal Article
  • 07-12-01-0004
Published 2019-08-22 by SAE International in United States
The four-wheel drive electric sport utility vehicle (SUV) requires high dynamic performance, and the front and rear axles are matched with a high-power motor. High-power motors operate under low-speed and low-torque conditions, with low efficiency and large power loss. To reduce the power loss under low-speed and low-load conditions, a hybrid system of front and rear dual motors and dual hydraulic pumps/motors is designed. A simulation model of a four-wheel drive SUV electrohydraulic hybrid system is constructed. Aiming at the optimal energy consumption, a dynamic programming algorithm is adopted to establish the driving control rules of the vehicle. Constrained by the Economic Commission for Europe Regulation No.13 (ECE R13), a braking-force distribution strategy for the front and rear axles is formulated. On the premise of satisfying the braking safety, regenerative braking is preferred, and the braking energy is recovered to the greatest extent possible. The optimal efficiency curve of the motor is identified, and an energy-management strategy based on the optimal efficiency curve of the motor is established. The comprehensive efficiency of the dual motor…
This content contains downloadable datasets
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Shock Wave Impact Simulations Using Fluid/Structure/Dynamics Interactions

CAViDS, Western Michigan Univ.-Yang Yang, William Liou
TARDEC, US Army RDECOM-James Sheng , David Gorsich, Sudhakar Arepally
Published 2011-04-12 by SAE International in United States
Ground vehicle subjecting to a blast can sustain vehicle damages and occupant injuries. Direct blast thermal and force loadings compromise vehicle structural integrity and cause damages. Computer simulations of vehicle blast wave damages can be obtained by solving the gas dynamics of the blast wave and the structural dynamics of the vehicle, through a projection of the wave's impact on the vehicle structure. There are various possible ways that the blast can cause injuries to the vehicle occupants, such as direct collision with objects instantly accelerated by the blast pressure and impact by the secondary shock waves transmitted through the platform structure. This paper describes a parallel computer simulation methodology that can potentially be applied to predict the structure damage and the associated occupant kinematics during a blast event by solving the multi-physics problem of fluid dynamics, solid dynamics, and multi-body dynamics. A generic box model was used in the demonstration of this newly-developed methodology. The generic land system structure consists of a box representing a vehicle armor structure, and a rigid body system representing…
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

A New Archetype of Automatic Transmission

Beihang Univ.-Yanxiao Fu, Yang Yang, Xiangyang Xu, Yanfang Liu
Published 2011-04-12 by SAE International in United States
With the rapid development of the world's automobile industry, china's car sales have increased with each passing day. The automobile industry has become one of china's leading industries, and the market share of the automatic transmission in the Chinese car market is growing rapidly. Based on the actual status of the automatic transmission industry in china, we analyze the present condition and development tendency of the automatic transmission market in china in this thesis. We analyze and discuss some features like structure, design, technology of the AT / AMT / CVT / DCT and their adaptability in Chinese automatic transmission market. On that basis we bring forward a conceptual design of a 8-speed automatic transmission which is for a front-wheel drive vehicles, then we analyze the feature of 8AT's design, introduces the design and engineering development of 8AT.Finally, we discuss the possibility SOP of 8AT in China.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Preliminary Numerical Analysis of Valve Fatigue in a Checkball Pump for Driveline Applications

Center For Advanced Vehicle Design, Western Michigan Univ-Yang Yang, William Liou
Eaton Corporation-Benjamin Morris
Published 2010-10-05 by SAE International in United States
Recent studies have shown that hydraulic hybrid drivelines can significantly improve fuel savings for medium weight vehicles on stop-start drive cycles. In a series hydraulic hybrid (SHH) architecture, the conventional mechanical driveline is replaced with a hydraulic driveline that decouples vehicle speed from engine speed. In an effort to increase the design space, this paper explores the use of a fixed displacement checkball piston pump in an SHH driveline. This paper identifies the potential life-limiting components of a fixed displacement checkball piston pump and examines the likelihood of surface fatigue in the check valves themselves. Numerical analysis in ABAQUS software suggests that under worst case operating conditions, cyclic pressure loading will result in low-cycle plastic deformation of check valve surfaces.
Annotation ability available
   This content is not included in your SAE MOBILUS subscription, or you are not logged in.

Comparison of Computational and Experimental Aerodynamics Results for a WMU Solar Car Model

Mechanical and Aeronautical Engineering, Western Michigan University-Yang Yang, William W. Liou
Published 2005-04-11 by SAE International in United States
Three-dimensional numerical simulations using FLUENT [1] were performed to model the airflow over the Sunseeker, an award-winning solar car that was designed and built at Western Michigan University. Converged numerical solutions on three different grids are reported and compared with the available experimental data, which include the lift and the drag coefficients. Also reported are the results obtained by using the second-order upwinding discretization on one of the grids. The comparison shows that the computed lift coefficients agree well with the experimental data for all the three grids and the different orders of numerical methods, indicating that the pressure field is well captured. The agreement with the data for drag coefficient varies, which appears to suggest a higher degree of dependency on the grid distributions than that for the lift coefficient. These results are discussed in terms of their implications for the simulations of similar low-drag vehicles.
Annotation ability available