Title: Regenerative braking torque control of air hybrid engines with cam-based valvetrains

Authors: Amir Fazeli; Amir Khajepour; Cecile Devaud; Mohammad Pournazeri

Addresses: Mechanical & Mechatronics Engineering Department, University of Waterloo, Waterloo, Ontario, Canada. ' Mechanical & Mechatronics Engineering Department, University of Waterloo, Waterloo, Ontario, Canada. ' Mechanical & Mechatronics Engineering Department, University of Waterloo, Waterloo, Ontario, Canada. ' Mechanical & Mechatronics Engineering Department, University of Waterloo, Waterloo, Ontario, Canada

Abstract: In this work, a novel air hybrid engine configuration is introduced in which cam-based valvetrain along with three-way and unidirectional valves make the implementation of different engine operational modes possible. In the proposed configuration, an electronic throttle system is used to manage the engine load in both conventional and braking modes. The necessity of engine torque control during regenerative braking is discussed and a lookup table/PI controller is applied to the engine model in GT-Power to control the engine torque at the regenerative mode. It is shown that utilising the proposed configuration, the regenerative braking mode can be simply implemented and the braking torque can be regulated by controlling the throttle angle.

Keywords: air hybrid engines; regenerative braking; cam-based valvetrains; engine torque control; powertrains; electronic throttle.

DOI: 10.1504/IJPT.2011.042765

International Journal of Powertrains, 2011 Vol.1 No.2, pp.179 - 197

Received: 05 Jul 2010
Accepted: 05 Apr 2011
Published online: 26 Feb 2015 *

Full-text access for editors Full-text access for subscribers Purchase this article Comment on this article