Past research on hybrid electric vehicles (HEVs) focused primarily on improving their fuel economy. Emission reduction is another important performance attribute that needs to be addressed. When emissions are considered for hybrid vehicles with a gasoline engine, horizon-based optimization methodologies should be used because the light-off of the three-way catalytic converter heavily depends on the warming-up of catalyst temperature. In this paper, we propose a systematic design method for a cold-start supervisory control algorithm based on the dynamic programming (DP) methodology. First, a system-level parallel HEV model is developed to efficiently predict tailpipe emissions as well as fuel economy. The optimal control problem for minimization of cold-start emissions and fuel consumption is then solved via DP. Since DP solution cannot be directly implemented as a real-time controller, more useful control strategies are extracted from DP solutions over the entire state space via the comprehensive extraction method. The extracted DP results indicate that the engine on/off, gear-shift, and power-split strategies must be properly adjusted to achieve fast catalyst warm-up and low cold-start tailpipe emissions. Based on DP results, we proposed a rule-based control algorithm that is easy to implement and adjust while achieving near-optimal fuel economy and emission performance.
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November 2011
Research Papers
Supervisory Control of Parallel Hybrid Electric Vehicles for Fuel and Emission Reduction
Dongsuk Kum,
Dongsuk Kum
Department of Mechanical Engineering,
University of Michigan
, G041 Lay Automotive Laboratory, Ann Arbor, MI 48109-2133 e-mail:
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Huei Peng,
Huei Peng
Department of Mechanical Engineering,
University of Michigan
, G036 Lay Automotive Laboratory, Ann Arbor, MI 48109-2133 e-mail:
Search for other works by this author on:
Norman K. Bucknor
Norman K. Bucknor
Propulsion Systems Research Laboratory,
General Motors R&D Center
, Warren, MI 48091 e-mail:
Search for other works by this author on:
Dongsuk Kum
Department of Mechanical Engineering,
University of Michigan
, G041 Lay Automotive Laboratory, Ann Arbor, MI 48109-2133 e-mail:
Huei Peng
Department of Mechanical Engineering,
University of Michigan
, G036 Lay Automotive Laboratory, Ann Arbor, MI 48109-2133 e-mail:
Norman K. Bucknor
Propulsion Systems Research Laboratory,
General Motors R&D Center
, Warren, MI 48091 e-mail: J. Dyn. Sys., Meas., Control. Nov 2011, 133(6): 061010 (10 pages)
Published Online: November 11, 2011
Article history
Received:
December 7, 2009
Revised:
May 19, 2010
Online:
November 11, 2011
Published:
November 11, 2011
Citation
Kum, D., Peng, H., and Bucknor, N. K. (November 11, 2011). "Supervisory Control of Parallel Hybrid Electric Vehicles for Fuel and Emission Reduction." ASME. J. Dyn. Sys., Meas., Control. November 2011; 133(6): 061010. https://doi.org/10.1115/1.4002708
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