HITACHI : Practical Application of a Hybrid Drive System for Reducing Environmental Load

	Volume 57 Number 1 March 2008
	Industrial Systems

AUTHORS

Kazuo Tokuyama	Rolling Stock Engineering Dept., Rolling Stock Systems, Transportation Systems Div., Industrial Systems, Hitachi, Ltd.
Motomi Shimada	Transportation Systems Development Center, Mito Transportation Systems Product Div., Transportation Systems Div., Industrial Systems, Hitachi, Ltd.
Kiyoshi Terasawa	Rolling Stock Electrical Systems Design Dept., Mito Transportation Systems Product Div., Transportation Systems Div., Industrial Systems, Hitachi, Ltd.
Takashi Kaneko	Rolling Stock Electrical Systems Design Dept., Mito Transportation Systems Product Div., Transportation Systems Div., Industrial Systems, Hitachi, Ltd.

OVERVIEW

As part of our efforts to address energy and environmental issues, Hitachi, Ltd. is actively involved in reduction of energy consumption by means of compactization, improving efficiency of equipment, and regenerative braking. However, as for DMUs running in non-electrified regions, on top of the fact that regenerative braking cannot be applied as a system for direct drive by diesel engine, reduction of NOx and CO₂ gases contained in exhaust is a challenge. Accordingly, we have practically applied a hybrid drive system that can reduce environmental load by means of applying secondary batteries to store regenerative energy and by running the engine at maximum rotational frequency (at which efficiency is high) and switching to electrical energy. What's more, as technical expansion applying rechargeable batteries, we have developed (1) a diesel high-speedtrain hybrid system (planned to be deployed on long-distance high speed railways) and (2) a battery-type sequential regenerative system (for realizing stable performance and low energy consumption in regards to electric-trainuse drive systems).

TO READ THIS ARTICLE

See PDF file for details(PDFformat, r2008_01_003.pdf, 155KB)

RELEVANT SITES

	Hitachi-Rail.com
	The Hitachi Hyoron (Japanese Only)

KEYWORDS

Hybrid, Rechargeable, battery, System

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