Abstract
In order to reduce CO2 emission from the commercial vehicles, the introduction of the hybrid truck into the market has been promoted. As previously reported, the fuel economy of the hybrid trucks was improved with implementation of changing the hybrid control method, but the exhaust-gas emission of it was not good performance. In this report, the hybrid control method for achieving a good balance of the fuel economy and exhaust-gas emission was investigated by using the “Hybrid Powertrain Test Bed System”. An optimum hybrid control method was to combine the method of the hybrid commercial truck at the low vehicle speed area and the method of a hybrid passenger vehicle at the high vehicle speed area. CO2 emission produced from the virtual hybrid trucks, which adopted an optimum hybrid control method, was reduced compared to the conventional diesel truck.
