The optimal control of plug-in diesel hybrid electric vehicle with considering the threshold of exhaust back pressure
WEI Han-bing
LIU Xiao-fei
PENG Zhi-yuan
Abstract：The influence of exhaust back pressure for the engine performances is analyzed according to the experiment results from diesel engine test rig. In order to obtain the comprehensive optimization of the fuel and emission of plug-in hybrid electric vehicle (PHEV), this paper pays attention to the effects of exhaust back pressure on fuel economy and emis-sion in the design of the PHEV control strategy. Then multi-objective cost function relating to the exhaust back pressure and the battery's state of charge have been establish and solved by Pontryagin's Minimum Principle. In order to validate the effectiveness of the control strategy we proposed, the vehicle dynamic model including the pressure drop model and collection efficiency model of diesel particle filter (DPF) has been established in the MATLAB/Simulink platform. Other three control strategies, the charge–depleting and charge–sustaining (CD–CS), single PMP (S–PMP) and double PMP (D–PMP) control strategies are implemented for comparison at the same time. Simulation results show that the optimal control strategy proposed in the paper significantly eliminate the effect of increasing exhaust back pressure on the engine perfor-mance. The fuel economy and emission performance has been improved effectively. In order to further verify the effective of the proposed optimal control strategy, the bench tests experiment are conducted. The results show that the equivalent fuel consumption and PM emission is reduced by 15.28%and 34.25%respectively.
Keywords：hybrid electric vehiclediesel engineexhaust back pressurepontryagin's minimum principleoptimal controlemission
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：8( 533-540 )