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Control and Drive Quality Re finement of a Parallel-Series Plug-in Hybrid Electric Vehicle

Yard, Matthew Alexander
http://rave.ohiolink.edu/etdc/view?acc_num=osu1417695439

Abstract Details

2014, Master of Science, Ohio State University, Mechanical Engineering.
Increasingly stringent government regulations and the rising price of oil are causing automotive manufactures to develop vehicles capable of obtaining higher fuel economies and lower emissions. To achieve these goals, automotive manufactures have been developing hybrid-electric vehicles (HEV) and plug-in hybrid-electric vehicles (PHEV) that use both electricity and petroleum based fuels as their power sources. While hybridizing the vehicle powertrain improves the fuel efficiency of the vehicle, the addition of multiple power sources and modes creates many unique issues with vehicle driveability that are difficult and time-consuming to calibrate. The drive quality (also referred to as driveability) of a vehicle refers to the vehicle's responsiveness to driver inputs and overall smoothness of the vehicle in operation. A vehicle with good drive quality results in a comfortable ride for both the driver and passengers. Drive quality is a subjective measure of the driver's perception of the dynamic responses of the vehicle. It is typically measured using highly trained test drivers that analyze the vehicle's behavior under specific driving conditions such as take-off, acceleration, pedal tip-in/tip-out, gear shifts, and braking. Assessing and improving vehicle drive quality in this way can be time consuming and is subject to human error. Recently, major automobile manufacturers have begun to move towards the use of specially-designed software packages to evaluate drive quality objectively. This thesis discusses the development of control strategies for The Ohio State University's EcoCAR 2 competition vehicle with an in-depth analysis of the effects of the control strategies on the objectively-measured drive quality of the vehicle. The OSU EcoCAR 2 vehicle had serious issues tip-in drive quality due to the high amount of gear backlash present in the powertrain. A feedforward control was implemented to smooth the driver's torque request to minimize the negative effect of gear backlash on the tip-in drive quality. The control system developed to accomplish this contains easily calibratable parameters that can be quickly adapted to be used in future EcoCAR vehicles and is mostly independent of the powertrain architecture. A control system for implementing regenerative braking in the OSU EcoCAR 2 vehicle was developed and calibrated to provide smooth torque delivery and positive drive quality characteristics. This included both creep torque at low vehicle speed as well as coastdown torque at higher vehicle speeds in order to mimic the behavior of a conventional vehicle with a traditional internal combustion engine and automatic vehicle. Finally, a robust and reliable control system is presented for shifting the automated manual transmission in the OSU EcoCAR 2 by speed matching the input and output shaft speeds using an electric machine. This control system includes a gear shifting handshaking process that was implemented between the supervisory and transmission controllers to facilitate the complex gear shifting process. The effects of this unique gear shifting process on the drive quality of the vehicle is also discussed.
Shawn Midlam-Mohler, Dr. (Advisor)
Giorgio Rizzoni, Dr. (Advisor)
86 p.
Mechanical Engineering
Hybrid Vehicles; Drive Quality; AVL DRIVE; Regenerative Braking; Driveability; Tip-in; Controls

Recommended Citations

Citations

  • Yard, M. A. (2014). Control and Drive Quality Re finement of a Parallel-Series Plug-in Hybrid Electric Vehicle [Master's thesis, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1417695439

    APA Style (7th edition)

  • Yard, Matthew. Control and Drive Quality Re finement of a Parallel-Series Plug-in Hybrid Electric Vehicle. 2014. Ohio State University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1417695439.

    MLA Style (8th edition)

  • Yard, Matthew. "Control and Drive Quality Re finement of a Parallel-Series Plug-in Hybrid Electric Vehicle." Master's thesis, Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1417695439

    Chicago Manual of Style (17th edition)

osu1417695439
1,526
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This open access ETD is published by The Ohio State University and OhioLINK.