Torque distribution for an integrated starter generator parallel hybrid electric car
Energy management strategy plays an important role in fuel economy improvement for hybrid electric vehicles. Because the internal combustion engine (ICE) speed is uncontrollable, the ICE torque becomes the only controllable factor for an integrated starter/generator parallel hybrid electric car. Therefore, energy management must consider how to employ a torque approach. A novel torque distribution strategy was used as the basis for minimizing the powertrain equivalent specific fuel consumption. The electric motor equivalent fuel consumption can be obtained by calculating the power conversion efficiency among the powertrain components. The disadvantage of long calculation times could . be dealt with by employing off-line calculations. The optimal torque distribution becomes a simple process using the vehicle target torque, the ICE speed, and the ultracapacitor voltage. It is convenient for application and time controlling. Simulations were conducted with the vehicle and strategy models. Test results on a Chinese urban transient-state driving-cycle demonstrated that the fuel economy could be improved by 5. 2% with this novel strategy.
hybrid electricfuel economyenergy managementelectric motor equivalent fuel consumptionpowertrain equivalent specific fuel consumption
国家科技期刊平台
NSTL
万方数据
维普
