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 (528Kb)
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24,065,000 Yen (FY1996 8,031,000 Yen)
The objective of this study is to reveal the proper power system for "Commuter-cars"(Ultra mini-sized vehicles for short range use), and to introduce such vehicles to urban areas to reduce CO2 emission from vehicles.
First, a new type of the "Wheel-in-motor system" which applies a reduction gear and a high-speed DC brushless motors was designed for improving performance of present electric vehicles.
Next, a conventional EV was converted to a series hybrid vehicle with a small generator, and basic experiments were carried out on a chassis dynamometer. The range extension ratio by the hybridizing was 80%, compared to the base EV, so the suitability of series hybrid system for commuter-cars was clarified.
Therefore, a simulated series hybrid commuter-car using components of the conventional EV was set on a chassis dynamometer, and tested in transient driving patterns. Acceleration ability and energy consumption were improved by the downsizing. On the other hand, two types of series hybrid commuter-car(Charge-dependent type and Self-sustaining type) were proposed, and an optimum combination of battery and generator was considered to have sufficient running range and low environmental load.
Further, a new series hybrid system which adopted an AC inverter motor, fuel economical engine and a generation regulator was designed for a commuter car. It was examined by bench tests or calculations. As a result, both of the total energy efficiency and the performance of the system was improved remarkably in comparison with the former system mentioned above.
Finally, calculation method of life cycle CO2 emission of the series hybrid commuter car was considered. And, the effects of introducing commuter-cars upon CO2 reduction were estimated.
Commuter-Car, Series Hybrid system, Transient Driving, CO2 reduction