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Starting Process Control of a 2-Cylinder PFI Gasoline Engine for Range Extender

Tongji University-Minglong Li, Ran Zhang, Xingyu Zeng, Weiqi Ding, Weiang Mao, Shaoye Jin, Rufeng Xu, Dengke Yuan, Zongjie Hu, Zaimin Zhong, Liguang Li
  • Technical Paper
  • 2020-01-0315
To be published on 2020-04-14 by SAE International in United States
With the increasing worldwide concern on environmental pollution, battery electrical vehicles (BEV) have attracted a lot attention. However, it still couldn’t satisfy the market requirements because of the low battery power density, high cost and long charging time. The range-extended electrical vehicle (REEV) got more attention because it could avoid the mileage anxiety of the BEVs with lower cost and potentially higher efficiency. When internal combustion engine (ICE) works as the power source of range extender (RE) for REEV, its NVH, emissions in starting process need to be optimized.In this paper, a 2-cylinder PFI gasoline engine and a permanent magnet synchronous motor (PMSM) are coaxially connected. Meanwhile, batteries and load systems were equipped. The RE co-control system was developed based on Compact RIO (Compact Reconfigurable IO), Labview and motor control unit (MCU). Focused on the starting process, the effects of first firing speeds, throttle control strategies and coolant temperatures were tested.The results show that the higher first firing speed is preferred without obvious torque fluctuation, and longer throttle switching duration to high load results in…
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Research on Control Strategy Optimization for Shifting Process of Pure Electric Vehicle Based on Multi-Objective Genetic Algorithm

Jilin University-Yulong Lei, Jingxu Zhang, Yao Fu, Fuchun Jia, Binyu Wang
  • Technical Paper
  • 2020-01-0971
To be published on 2020-04-14 by SAE International in United States
With more and more countries proposing timetables for stopping selling of fuel vehicles, China has also issued a “dual-slope” policy. As electric vehicles are the most promising new energy vehicle, which is worth researching. The integration and control of the motor and gearbox have gradually become a hot research topic due to low cost with better performance.This paper takes an electric vehicle equipped with permanent magnet synchronous motor and two-gear automatic transmission without synchronizer and clutch as the research object. Through the action of the motor, gearbox and shift actuator in the shifting process, the whole vehicle dynamics is modeled in each stage of shifting, a method for determining a short-term driving style intensity factor for decision shifting is proposed, three evaluation indexes of the shift quality of electric vehicle are put forward, the control parameters affecting the shift quality are analyzed, and the mathematical relationship between the shift control parameters, the shifting time and the shifting impact are obtain. Besides, the NSGA-II algorithm is used to carry out multi-objective global optimization of the whole…
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Residual Aligning Moment Test

Highway Tire Committee
  • Ground Vehicle Standard
  • J1988_202003
  • Current
Published 2020-03-11 by SAE International in United States
This SAE Recommended Practice describes the determination of tire pull force properties for an uninclined tire (SAE J670e) on a laboratory flat surface tire force and moment machine. It is suitable for accurately determining pull forces and residual aligning moments for passenger and light-truck tires. These properties are important determinants of vehicle trim (See section 2.1.2). They describe steady-state, free-rolling pull effects ascribable to tires. The test method described in this document is suitable for comparative evaluation of tires for research and development purposes. The method is also suitable for modeling when followed carefully.
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Titanium Alloy, Hydraulic, Seamless Tubing 3.0Al - 2.5V Annealed

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4943L
  • Current
Published 2020-02-18 by SAE International in United States
This specification covers a titanium alloy in the form of seamless tubing.
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Aluminum Alloy, Castings 5.0Si - 1.2Cu - 0.50Mg (C355.0-T6) Solution and Precipitation Heat Treated

AMS D Nonferrous Alloys Committee
  • Aerospace Material Specification
  • AMS4215J
  • Current
Published 2020-02-17 by SAE International in United States
This specification covers an aluminum alloy in the form of sand, permanent mold, composite mold, and investment castings.
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Titanium Alloy Tubing, Seamless, Hydraulic 3Al - 2.5V, Texture Controlled Cold Worked, Stress Relieved

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4946F
  • Current
Published 2020-02-13 by SAE International in United States
This specification covers a titanium alloy in the form of seamless tubing.
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Titanium Alloy Tubing, Seamless, Hydraulic 3Al - 2.5V, Controlled Contractile Strain Ratio Cold Worked, Stress Relieved

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4945H
  • Current
Published 2020-02-13 by SAE International in United States
This specification covers a titanium alloy in the form of seamless tubing.
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Measurement Uncertainty and Consumer Risk

E-25 General Standards for Aerospace and Propulsion Systems
  • Aerospace Standard
  • AIR6553
  • Current
Published 2020-02-03 by SAE International in United States
This document addresses measurement uncertainty and consumer risk as they relate to AS8879 thread inspection. It describes the rationale, theory and methodology used to generate the technical content of the AS5870. The document describes how to calculate measurement consumer risk. It documents all of the calculation methods which industry employs today to calculate what is commonly called measurement uncertainty (Appendices A, B, C, D, E and F). These, in turn, are used to calculate measurement uncertainty ratios which are required inputs to calculate measurement consumer risk. Users of this document can apply the information described herein for the evaluation of the capability of their measurements based on the measurement consumer risk. It involves the analysis of the measurement (product) distribution and biases of both the product and measurement system distributions. It protects the consumer from the worst case distribution results.
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Titanium Alloy Tubing, Seamless, Hydraulic 3.0Al - 2.5V Cold Worked, Stress Relieved

AMS G Titanium and Refractory Metals Committee
  • Aerospace Material Specification
  • AMS4944M
  • Current
Published 2020-01-30 by SAE International in United States
This specification covers a titanium alloy in the form of seamless tubing.
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Oil, Reference, for “L” Stock Rubber Testing

AMS CE Elastomers Committee
  • Aerospace Material Specification
  • AMS3020B
  • Current
Published 2020-01-17 by SAE International in United States
This specification covers a petroleum-based reference oil.
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