Speed control experiments for heavy duty vehicles with coordinated friction and engine compression brakes Online publication date: Mon, 04-Oct-2004
by M. Druzhinina, A. Stefanopoulou
International Journal of Heavy Vehicle Systems (IJHVS), Vol. 11, No. 3/4, 2004
Abstract: In this paper, we describe the development and experimental validation of a coordination scheme between friction and engine compression brakes for a Class 8 Freightliner truck used as a development platform in the California PATH program. The coordination scheme maintains the speed tracking performance of the nominal PID controller, which was originally designed for the case of friction brakes only. Through the coordination scheme, the command of the nominal PID controller is interpreted as a braking torque demand and split into a friction brake command and compression brake command. The split is based on the models for the compression braking torque and friction braking torque developed and identified from open-loop experiments. The results of closed-loop experiments show that the integration of the compression brake into the speed control framework reduces the usage and therefore the wear of the conventional friction brakes.
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