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In this paper, a motor-generator (MG) control algorithm was proposed to improve the shift quality for a dual mode power split transmission (PST) hybrid electric vehicle (HEV). In order to analyze the shift characteristics during the mode shift, Bondgraph models for transient-state were constructed and state equations were derived. From the state equations, it was found that inertia torque of MG2 causes...
A battery charging control using a driving motor is proposed for an AT based parallel HEV. To charge the battery using the driving motor, a 2-clutch system control is proposed which uses the engine clutch and the clutch inside the transmission. The battery charging efficiency is estimated from the engine fuel consumption and efficiency of the power electronics. To evaluate the performance of the suggested...
For a plug-in hybrid electric vehicle (PHEV) which consists of power-split type transmission, multiple drive modes is required to manage the PHEV to satisfy different driving situations: charge depleting (CD) or charge sustaining (CS). In this study, a transmission efficiency based mode control algorithm was proposed to determine the CD mode shift map of PHEV. The powertrain model and energy management...
In this paper, an energy management strategy with a real time feature is proposed for a CVT (continuously variable transmission) based parallel hybrid electric vehicle. The purpose of this study is to avoid using the engine to charge the battery directly, which provides improved energy efficiency. For this purpose, the recuperated energy during the regenerative braking is distributed in a geometric...
A comparative study was performed for two types of plug-in hybrid electric vehicles (PHEVs): GM Volt and Toyota Prius Plug-in Hybrid. First, powertrain models of the two vehicles were derived. Based on the dynamic models, a detailed component control algorithm was developed for each PHEV. Especially, a control algorithm was proposed for motor generator 1 (MG1) and MG2 to achieve optimal engine operation...
In this paper, a line pressure control algorithm was developed to reduce the energy loss of the AT-based hybrid vehicle. A hybrid vehicle performance simulator was developed. Via the analysis of the power flow and lever, the toque exerted on the friction elements was calculated for each gear step of the HEV. From the calculated torque at each friction element, the optimal line pressure was determined...
In this paper, a control strategy based on transmission efficiency for a dual mode power split-type hybrid electric vehicle (HEV) that considers mechanical loss is developed. Two control strategies, based on the transmission efficiency for the dual mode PST, that consider the TM loss are proposed. An optimal operation line (OOL) control strategy is developed to maintain high engine thermal efficiency...
In this study, the mode change characteristics of the dual mode power split type hybrid electric vehicle were investigated, and a control algorithm was proposed to reduce the torque variation of the drive shaft during the mode change. To analyze the characteristics of the dual mode power split transmission during mode change, dynamic models for the planetary gear, engine, motor-generator, battery...
Motor control algorithm on how to operate the internal combustion engine (ICE) is proposed for hybrid electric vehicle (HEV) with EVT which consists of a power variator, MG1 and MG2, and planetary gear set. From the network analysis results, it is found that the EVT efficiency decreases in high speed ratio region due to the power circulation, and it is required that the ICE needs to be operated on...
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