Abstract
Next-generation vehicles are under energy and environmental pressure to increase fuel economy and reduce emissions of green-house-gases (GHG) such as carbon dioxide, which is the main cause of global warming, while maintaining the performance and drivability characteristics of conventional internal combustion engine (ICE) automobiles. So, hybridization of both conventional ICE and electric motor powertrain systems hold great promise for environmentally friendly vehicles (EFV) to meet stringent CO2 regulation and fuel economy requirements. This paper presents the effects of the initial state of charge (SOC) stored in the vehicle’s battery on tractive propulsion characteristics as vehicle drivability performance that is obtained from both ICE and an electric motor simultaneously. Especially, the battery management system (BMS) plays a key role in a hybridized system based on an electric device. And a regenerative braking system recovers kinetic energy from braking and uses it to recharge the battery. In this study, in order to investigate the effects of various initial SOCs in a parallel hybrid gasoline-electric vehicle (HEV), an experiment was carried out on a vehicle chassis dynamometer with IM240 vehicle driving mode and a CAN protocol analyzer to collect data from a full HEV. A unique hybrid electric signal processor was designed to monitor the operational state of the ICE including fuel injection duration, hybrid starter-generator (HSG) and propulsion motor which depend on the initial SOC. The amount of energy recovered through the regenerative braking system was measured to investigate the collect rates of currents. The results show that the initial SOC stored in the battery causes big differences in the electric current balance in hybrid operating mode, and that careful coordination of ICE and motor is necessary to achieve vehicle propulsion capacity as well as to maintain the battery SOC at a reasonable level.
Highlights
The R&D trend of the automotive industry has been towards improving fuel economy and using alternative power-drivetrain sources, due to the lack of traditional fossil fuels and stricter regulations on vehicle emission
This paper reports on the achieved electric current balances for the six operating modes according to the varied initial state of charge (SOC) of the full parallel hybrid application for a passenger vehicle based on a 2.0 L gasoline engine
In the case of SOC 50%, it was observed that the accumulated injection duration was decreased by about 14% from that of SOC of 35%. These results indicate that the SOC has an important influence on fuel economy performance because it is significantly affected by engine running time and the torque
Summary
The R&D trend of the automotive industry has been towards improving fuel economy and using alternative power-drivetrain sources, due to the lack of traditional fossil fuels and stricter regulations on vehicle emission. This paper reports on the achieved electric current balances for the six operating modes according to the varied initial SOCs of the full parallel hybrid application for a passenger vehicle based on a 2.0 L gasoline engine.
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