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PROJECT TITLE :

Stability Investigation of an Idle Speed Control Loop for a Hybrid Electric Vehicle

ABSTRACT:

During this temporary, we investigate the stability of an idle speed control (ISC) loop for a hybrid electrical vehicle (HEV). The actuators in an HEV powertrain are subject to delays, which will cause instability. Furthermore, in a parallel hybrid setup, these actuators are coupled via a twin mass flywheel, introducing nonlinear behavior through a mechanical dead-zone. The resulting control loop is a Lur'e-kind nonlinear system with delays. To investigate its stability, a straightforward Lyapunov-Krasovskii purposeful is constructed, taking into account the delays and nonlinear feedback part simultaneously. By means that of a quadratic program formulation, conservatism concerning the nonlinearity is reduced. A powertrain model is presented from that an idle speed controller has been designed and successfully implemented on an electronic management unit. Finally, it can be shown that stability for the ISC loop is guaranteed, based on the controller design model of the HEV powertrain.


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