Plug-in hybrid electric vehicle's real-time control strategy considering catalytic converter's efficiency

Abstract

In order to improve the catalytic converter's efficiency of plug-in hybrid electric vehicle, the additional cost function was proposed to achieve temperature compensation when the catalyst temperature deviated from the suitable temperature range. On the basis of this, the engine fuel consumption and the additional cost when catalytic converter temperature deviated from its suitable temperature range were considered as the objective function, the Hamilton function was established according to Pontryagin minimum principle, and the real-time control strategy considering converter's efficiency was obtained after solving the objective function. This real-time control strategy was compared with the real-time control strategy without considering the converter's efficiency. The results show that comparing to the real-time control strategy without considering the converter's efficiency, the one considering converter's efficiency increases by 2.2% in terms of fuel consumption, but HC emission, CO emissions and NOx emissions decrease by 17.9%, 25.9% and 24.5%, respectively. Therefore, the real-time control strategy considering the converter's efficiency can greatly improve the emission performance of vehicle with little cost of fuel economy. © 2016, Editorial Department of China Journal of Highway and Transport. All right reserved.