Improvement of battery charging efficiency using 2-clutch system for parallel hybrid electric vehicle

Abstract

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 battery charging control, HEV performance simulator is developed and simulations are performed for FTP-72 mode. Simulation results show that battery charging using the driving motor has a higher charging efficiency and faster charging speed compared with the conventional battery charging system using the ISG.

Analysis of Energy Flow in a Mid-Sized Electric Passenger Vehicle in Urban Driving Conditions

“…In this study, the air conditioner was not operated during the vehicle test. In the case of the BMW i3, 26% of the energy consumed from the battery when operating the air conditioner is used to operate the electric heater [15]. Therefore, in this study, when the air conditioner is operated, it is expected that the loss of the air conditioner will occupy a large portion of the loss items.…”

“…The relational expression for the input and output power of the reducer and differential gear while the vehicle is running can be defined as follows by Equations ( 9), ( 10), ( 14) and (15).…”