| Abstract |
This paper describes a novel electromagnetic transducer called the Four Quadrant Transducer (4QT) for hybrid electric vehicles. The system consists of one electrical machine unit (including two rotors) and two inverters, which enable the vehicle's Internal Combustion Engine (ICE) to run at its optimum working points regarding efficiency, almost independently of the changing load requirements at the wheels. In other words the ICE is operated at high torque and low speed as much as possible. As a consequence, reduced fuel consumption will be achieved. The basic structure of the Four Quadrant Transducer system, simulation results and ideas about suitable topologies for designing a compact machine unit are reported. The simulated system of a passenger car is equipped with a single step gearbox making it simple and cost effective. Since the engine is not mechanically connected to the wheels and the electrical components have lower power ratings than the engine itself, the system takes advantage of the best characteristics of the series- and the parallel hybrid, respectively. The proposed concept looks promising and fuel savings of more than 40% compared with a conventional vehicle can be achieved. |
