Title: Controller structure for high response engine exhaust throttles

Authors: Ádám Bárdos; Barna Szimandl; Huba Németh

Addresses: Department of Automobile Technologies, Budapest University of Technology and Economics H-1111, Hungary ' Department of Automobile Technologies, Budapest University of Technology and Economics H-1111, Hungary ' Department of Automobile Technologies, Budapest University of Technology and Economics H-1111, Hungary

Abstract: Exhaust throttles are widely used as cost-effective endurance brakes on commercial vehicle diesel engines. To fulfil the requirements as endurance brakes exhaust flaps have only two states: fully opened and fully closed. However, there are several possible new applications, suggested by the authors, in which exhaust throttles could be utilised. To provide these functionalities a backpressure controller that can adjust the exhaust manifold pressure arbitrarily is needed. In this paper, the design and performance evaluation of an exhaust pressure controller is described. A first engineering principle-based, mean-value, nonlinear model of the engine and the actuator is described and validated with test bench measurements. Based on the nonlinear model a feedforward term was obtained. As feedback, an LQ servo controller was designed. The controller performance and the compliance of requirements was evaluated in three different test cycles on a medium-duty diesel engine, simulating brake blending, thermomanagement, and EGR support operations.

Keywords: diesel engines; exhaust throttle; pressure control; nonlinear control systems; optimal control.

DOI: 10.1504/IJHVS.2020.108736

International Journal of Heavy Vehicle Systems, 2020 Vol.27 No.3, pp.325 - 339

Published online: 30 Jul 2020 *

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