Citation

Anwar S, Reyhart D, Reyhart DR. Int. J. Veh. Des. 2011; 56(1/2/3/4): 270-298.

Copyright

(Copyright © 2011, Inderscience Publishers)

DOI

10.1504/IJVD.2011.043271

PMID

unavailable

Abstract

This paper presents an optimal algorithm to enhance the performance of an On-Demand All-Wheel Drive (ODAWD) vehicle by traction improvement through regulation of wheel slip. A 'Minimum Fuel Problem' is developed with a cost function minimising the slip error and the control action defined as the ratio of the total torque transmitted to the non-driven wheels (rear wheels). A simplified vehicle model (bicycle model) is used to develop the proposed controller to optimally reduce the wheel slip error by engaging and dynamically controlling a hydraulic clutch. The controller performance was validated on a realtime Hardware-in-Loop (HIL) bench.


Keywords: optimal control; AWD; all-wheel drive; traction control; Pontryagin|s minimum principle; HIL; hardware-in-loop; real-time control; vehicle control; vehicle modelling; bicycle models; wheel slip error; hydraulic clutch.