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Development of a Vehicle Stability Control Strategy for a Hybrid Electric Vehicle Equipped With Axle Motors

Bayar, Kerem
http://rave.ohiolink.edu/etdc/view?acc_num=osu1305990434

Abstract Details

2011, Doctor of Philosophy, Ohio State University, Mechanical Engineering.
Hybrid-electric vehicles have been available to consumers for over a decade, and plug-in hybrid and pure electric vehicles are rapidly becoming mainstream products with the introduction of vehicles such as the Chevrolet Volt and the Nissan Leaf in 2011. These vehicles have in common an electric powertrain, comprised of one or more electric motors and of a battery pack which in the case of hybrid vehicles supplements and internal combustion engine. It is well understood that hybrid and electric vehicles have the benefit of significant reduction in CO2 emissions and in the use of petroleum as a fuel. However, one additional benefit of hybrid and electric vehicles remains so far under-utliized: the use of the electric traction system to enhance vehicle stability control. This potentially or low cost feature could provide additional motivation for customers to choose hybrid or electric vehicles over conventional ones. This dissertation documents the conception and development of a novel control strategy to allocate braking and tractive forces in a hybrid electric vehicle equipped with axle motors, for the purpose of enhancing the vehicle stability control system. The work described in this dissertation documents the development of a hierarchical control strategy, its design and stability proofs, and its evaluation using software and model in-the-loop methods. The work includes the development of a dynamic HEV simulator that is capable of evaluating vehicle dynamics responses during emergency maneuvers, to demonstrate its stability. For this purpose, a hybrid powertrain simulation model including batteries, motors, differential, shaft, wheel, and electro-hydraulic brake system models are developed. Furthermore, a simple yet reliable vehicle dynamics model is integrated with the powertrain model to capture longitudinal, lateral, yaw and roll degrees of freedoms of the vehicle. The development of the simulator is a minor, but an original contribution of this dissertation. The principal contribution of this work is a novel and systematic vehicle stability control (VSC) strategy that distributes the corrective longitudinal force and yaw moment action to generate individual wheel slip ratios by blending regenerative axle motor braking and/or traction with individual wheel braking; so as to track the desired vehicle speed and yaw rate without causing excessive vehicle sideslip angles. This dissertation shows that including the axle electric motors within the proposed VSC frame, improves the performance of vehicle stability control in comparison to production vehicle VSC strategies. The potential benefit of electric motors, namely their ability to provide rapid braking/tractive torque actuation, is utilized in addition to the friction brakes within the proposed VSC scheme. The resulting strategy is the first published result that shows that yaw tracking and vehicle stabilization can be performed without interfering in the driver’s longitudinal speed demand. Furthermore, the strategy limits the yaw rate in order to keep the vehicle sideslip angle in the safe range, by increasing the understeer coefficient whenever a sideslip angle safety threshold is exceeded. A secondary benefit of the proposed VSC scheme is its energy saving feature, thanks to the use of highly efficient electric motors and their regenerative braking capability in comparison to a standard vehicle stability control schemes that use only the brake and engine intervention. Finally, the proposed VSC strategy is tested in real time, by using a model-in-the-loop simulation set-up, using state-of-the-art hardware-in-the-loop computer systems. Model-in-the-loop simulation results for different road conditions and steering maneuvers showed that the proposed VSC performs satisfactorily in real time as well, suggesting that is amenable to in-vehicle implementation.
Giorgio Rizzoni, Prof (Advisor)
Junmin Wang, Prof (Committee Member)
Dennis Guenther, Prof (Committee Member)
Gary Heydinger, Dr (Committee Member)
Michael Pennell, Dr (Committee Member)
158 p.
Automotive Engineering
vehicle stability control; hybrid electric vehicle; yaw rate; sideslip angle

Recommended Citations

Citations

  • Bayar, K. (2011). Development of a Vehicle Stability Control Strategy for a Hybrid Electric Vehicle Equipped With Axle Motors [Doctoral dissertation, Ohio State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=osu1305990434

    APA Style (7th edition)

  • Bayar, Kerem. Development of a Vehicle Stability Control Strategy for a Hybrid Electric Vehicle Equipped With Axle Motors. 2011. Ohio State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=osu1305990434.

    MLA Style (8th edition)

  • Bayar, Kerem. "Development of a Vehicle Stability Control Strategy for a Hybrid Electric Vehicle Equipped With Axle Motors." Doctoral dissertation, Ohio State University, 2011. http://rave.ohiolink.edu/etdc/view?acc_num=osu1305990434

    Chicago Manual of Style (17th edition)

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© 2011, all rights reserved.
This open access ETD is published by The Ohio State University and OhioLINK.