This content is not included in your SAE MOBILUS subscription, or you are not logged in.
Virtual Method for Electronic Stop-Start Simulation & VDV Prediction Using Modified Discrete Signal Processing for Short Time Signals
ISSN: 0148-7191, e-ISSN: 2688-3627
Published April 14, 2020 by SAE International in United States
This content contains downloadable datasetsAnnotation ability available
Electronic Stop-Start (ESS) system automatically stops and restarts the engine to save energy, improve fuel economy and reduce emissions when the vehicle is stationary during traffic lights, traffic jams etc. The stop and start events cause unwanted vibrations at the seat track which induce discomfort to the driver and passengers in the vehicle. These events are very short duration events, usually taking less than a second. Time domain analysis can help in simulating this event but it is difficult to see modal interactions and root cause issues. Modal transient analysis also poses a limitation on defining frequency dependent stiffness and damping for multiple mounts. This leads to inaccuracy in capturing mount behavior at different frequencies. Most efficient way to simulate this event would be by frequency response analysis using modal superposition method. In order to do the same, there is a major hurdle which is due to the nature of the signal being highly transient and of short duration, this event is difficult to be captured in frequency domain. Traditional FFT techniques used for domain transformation are not accurate enough to capture and transform these short duration events from time domain to frequency domain and vice-versa. Simulation in frequency domain helps in interpreting the effects of modal interactions and resonances. It also helps in providing enablers to mitigate issues and use frequency dependent stiffness for mounts and appropriate damping. This paper focuses on providing a comprehensive method to capture this short duration transient ESS start event in frequency domain accurately, by using Discrete Fourier Transform (DFT) along with additional modifications to the mathematical formulation. This paper also highlights the boundary conditions required to accurately simulate this event for different suspension architectures for instance solid axle suspensions and independent suspensions. Finally, this paper also showcases test vs virtual correlation case studies for ESS virtual analysis of a full vehicle system with different suspension architectures.
CitationPaul, A., Kukreja, J., Haider, S., and Spadola, J., "Virtual Method for Electronic Stop-Start Simulation & VDV Prediction Using Modified Discrete Signal Processing for Short Time Signals," SAE Technical Paper 2020-01-1270, 2020, https://doi.org/10.4271/2020-01-1270.
Data Sets - Support Documents
|[Unnamed Dataset 1]|
- Windover, P.R., Owens, R.J., Levinson, T.M., and Laughlin, M.D. , “Stop and Restart Effects on Modern Vehicle Starting System Components,” 2015.
- DeBruin, L.A. , “Energy and Feasibility Analysis of Gasoline Engine Start/Stop Technology,” Ohio State University, 2013.
- Wishart, J. and Shirk, M. , “Quantifying the Effects of Idle-Stop Systems on Fuel Economy in Light-Duty Passenger Vehicles,” Idaho National Laboratory, 2012.
- Zhu, T., Wu, Y., Li, B., Zong, C., and Li, J. , “Simulation Research on the Start-Stop System of Hybrid Electric Vehicle,” Journal of Advances in Vehicle Engineering 3:55-64, 2017.
- Asekar, A.K. , “Stop-Start System Using Micro-Hybrid Technology for Increasing Fuel Efficiency,” International Journal of Mechanical and Production Engineering 1(6), 2013.
- Wang, Z. , “A General In-Place and In-Order Prime Factor FFT Algorithm,” Journal of Electronics (China) 8:60, 1991.
- Bekele, A. , “Cooley-Tukey FFT Algorithms,” Comp 5703 Advanced Algorithms.
- Douglas, L.J. , “Split-Raddix FFT Algorithms,” OpenStax-CNX Module: m12031.
- Wu, Y. , “New FFT Structures Based on the Bruun Algorithm,” IEEE Transactions on Acoustics, Speech and Signal Processing 38(1):188-191, 1990.
- Smith, J.O. , Mathematics of Discrete Fourier Transform (DFT) with Audio Applications Second Edition (W3K Publishing, 2007). ISBN:978-0-9745607-4-8.
- ISO 2631-1 , “Mechanical Vibration and Shock - Evaluation of Human Exposure to Whole-Body Vibration - Part 1: General Requirements” 1997.
- ISO 2631-2 , “Mechanical Vibration and Shock - Evaluation of Human Exposure to Whole-Body Vibration - Part 2: Vibration in Buildings (1 Hz to 80 Hz),” 2003.
- Allen, D.P., Taunton, D.J., and Allen, R. , “A Study of Shock Impacts and Vibration Dose Values Onboard Highspeed Marine Craft.”
- Kumar, V., Saran, V.H., and Guruguntla, V. , “Study of Vibration Dose Value and Discomfort due to Whole Body Vibration Exposure for a Two Wheeler Drive,” iNaCoMM2013, IIT Roorkee, India.
- Kreszyg, E. , Chapter 11, “Advanced Engineering Mathematics.”
- Viswanathan, M. , “Digital Modulations Using Matlab - Build Simulation Model from Scratch.”
- Wolfram Language & System Documentation Center.
- National Instruments , “The Fundamentals of FFT-Based Signal Analysis and Measurement in LabVIEW and LabWindows/CVI.”
- Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science , OpenCourseWare 2006.
- Zhang, Y. et al. , “A Comparison of the Wavelet and Short-Time Fourier Transforms for Doppler Spectral Analysis,” Medical Engineering & Physics 25(7), 2003.