Abstract
Hybrid electric vehicles equipped with several different power sources can change operation mode to deal with different operating conditions to improve fuel economy and reduce exhaust emissions. Due to the significant difference in the characteristics of the power sources and the discontinuity in the dynamics of the clutch, noticeable torque fluctuations occur during mode transition, which may result in system shock and an uncomfortable riding sensation. Based on the idea of a switched system, we proposed a three-stage control strategy to facilitate a smooth transition from electric mode to hybrid driving mode. In this coordination control strategy, a fuzzy-proportional–integral mixed controller was used to manipulate engine speed and an adaptive sliding mode controller was applied to control the electric motor torque for compensating for torque disturbances. Furthermore, the proposed control strategy was validated on hardware-in-the-loop simulation platform. The results demonstrate the effectiveness of t...
Highlights
Due to the increasingly stringent emission standards and the energy crisis, the development of hybrid electric vehicles has received increasing attention in recent decades.[1,2,3] Compared to conventional vehicles, hybrid electric vehicles provide cleaner and high-efficiency transportation and are equipped with several power sources (engine and electric motor) allowing alternate operation modes to deal with a complex driving cycle for improving fuel economy and reducing exhaust emissions
Hybrid electric vehicles provide cleaner and high-efficiency transportation and are equipped with several power sources allowing alternate operation modes to deal with a complex driving cycle for improving fuel economy and reducing exhaust emissions
A fuzzy-proportional– integral (PI) mixed controller and an adaptive sliding mode controller based on a switched system were, respectively, constructed to control engine speed and electric motor torque during the mode transition from the electric mode to hybrid driving mode
Summary
Due to the increasingly stringent emission standards and the energy crisis, the development of hybrid electric vehicles has received increasing attention in recent decades.[1,2,3] Compared to conventional vehicles, hybrid electric vehicles provide cleaner and high-efficiency transportation and are equipped with several power sources (engine and electric motor) allowing alternate operation modes to deal with a complex driving cycle for improving fuel economy and reducing exhaust emissions. This article proposes a novel control strategy for a parallel HEV during mode transition from electric mode to hybrid driving mode based on a switched system. The seamless transition was obtained by the engine speed regulation and electric motor torque control.
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