Optimisation of energy in electric power-assisted steering systems
by Kumeresan A. Danapalasingam
International Journal of Electric and Hybrid Vehicles (IJEHV), Vol. 5, No. 2, 2013

Abstract: Electric power-assisted steering (EPS) is a control system where an electric motor is used to provide assistance in vehicle steering. In this work controllers are designed for column-type EPS systems to enable energy optimisation. Two EPS systems are considered, namely brushed DC motor equipped EPS and brushless DC (BLDC) motor equipped EPS. Using mathematical models of EPS controllers are developed based on nonlinear adaptive regulation method to generate driver torque. Proportional-Integral-Derivative (PID) control is then applied to produce assistance torque in accordance to desired energy saving. Simulation results using Matlab show the trade-off between drivers comfort and energy consumption. The control paradigm introduced here fits appropriately in electric vehicles (EVs) where electrical energy is scarce.

Online publication date: Mon, 09-Sep-2013

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