Abstract
In this study, a control strategy for the series hybrid electric vehicle (SHEV) powertrain, based on the design of fixed-boundary-layer sliding mode controllers (FBLSMCs) and a battery charge scenario, is presented to enhance engine efficiency as well as extend battery cycle life. An appropriate battery charge scenario is designed to remove surge charge current, keep the battery staying in a high state-of-charge (SOC) region and avoid persistently-high charge power, which are positive factors to the battery lifetime extension. To locate the engine operation in the optimal efficiency area, two robust FBLSMCs against uncertain disturbances are configured in the powertrain control system, responsible for engine speed control and engine torque control, respectively. Simulation results are obtained for comparison between the proposed and conventional powertrain control schemes by using the Advanced Vehicle Simulator (ADVISOR). Through these simulations, the effectiveness and superiority of the FBLSMC-based SHEV power train control strategy are validated.
Highlights
Hybrid electric vehicles (HEVs), combining a conventional propulsion system with an energy storage system (ESS), achieve better fuel economy than conventional vehicles
In a series hybrid electric vehicle (SHEV), the electric power as the only propulsion power comes from the ESS and the electric generator that converts energy from fuel into electricity [4]-[6]
Considering these aspects, this paper presents an ellipse-like-based battery charge scenario
Summary
Hybrid electric vehicles (HEVs), combining a conventional propulsion system with an energy storage system (ESS), achieve better fuel economy than conventional vehicles. A power-flow management algorithm considering a normal operation mode and an electric vehicle (EV) operation mode appeared in [10] These SHEV powertrain control strategies fail to sufficiently address the highly nonlinear parameter variations and sudden external disturbances during the vehicle operation. In most SHEVs, the battery charge current is determined by the engine output power and load requirements together during the engine operation process. It is chaotic and varies rapidly, and surge current exists, which does great harm to the battery life [19]. Persistently-high power should be relatively avoided because it has potential negative influence to battery life [19] Considering these aspects, this paper presents an ellipse-like-based battery charge scenario. Simulation results verify that the proposed design strategy of SHEV powertrain controllers is valid and is more efficient compared with the conventional methodology
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