Although the vehicular diesel engine was initially introduced by both Daimler Benz and MAN in 1924,commercial activities on automotive diesel engine were began on 1930's in European country. It was very interested that these competitive situation for newly developed vehicular diesel engine was quite same in Japan in 1930's simultaneously. Although only 2 engines made in 1940 was existed in Japan already, luckily a very unique engine made by Gas-den (predecessor of Hino Motors) made in 1937 was discovered recently. This is report on this engine.

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Diesel vehicles have a good fuel economy and high durability. On the other hand, further reduction of NOx, CO, HC and Particulate Matter (PM) emitted from the diesel vehicle has been sought. The purpose.of this study was reduction of NOx emission from a heavy, duty diesel engine using the Urea SCR (Selective Catalytic Reduction) system. The performance of NOx reduction at low temperature was measured to improve the Urea SCR catalysts. The conversions of NOx emission were evaluated over the Japan diesel 13 mode and the transient mode (JE05 mode). The conversion efficiencies of NOx emission were obtained 63% at the Japan diesel 13 mode and 53% at the transient mode (JE05 mode).

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The Engine department of the Gas-Den, predecessor of the Hino Motors, Ltd. was reorganized as the Tokyo Automobile Industries Co. and the Hitachi Aero plane Co. in 1937 and 1939 respectively. In 1938, Japanese Navy ordered the production of German trainer "Biicker Jungman" to Kyushu Aero plane Co. and of its engine "Hirth HM504" to Gas-Den Co. respectively based on a license agreement. Although the Gas-Den (Hitachi) produced more than 1300 engines under the name of "Hatsukaze (First Wing)" for both Japanese Navy and also Army, but it was completely redesigned by Gas-Den. Its unique design was based on Gas-Den's own know-how and production technology. Hino Motors restored it by its original engine that was preserved in Hamamatsu base of Japanese Self Defense Air Force. This paper describes structure of "Hatsukaze" with comparison of original "Hirth HM504" and philosophy of technology transfer.

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The Engine department of the Gas-Den, predecessor of the Hino Motors, Ltd. Was reorganized as the Tokyo Automobile Industries Co. and the Hitachi Aeroplane Co. in 1937 and 1939 respectively. In 1937, the Gas-Den, begun the development work of an unusual titled engine. A realization of the Stratified charge engine was done by Mitsubishi and Toyota at about more than half century later in 1996, the Turbo compound engine was done by Wright Aeronautical Co. in 1952, and the sleeve valve engine was succeed only by the Bristol Aeroplane Co. (includes Napier Co. with same technology) in spite of almost all major aero engine manufacturers tried its development. Although the development project of Gas-Den was broken at last stage of the World War II due to urgent development work of the another high power engine, the concept and the will was great. This paper describes an out line of this unusual engine.

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当社の生産形態は, 多品種少量生産の組立工業であり部品加工・エンジン等の機構部品の組立・車両総組立の同期化に問題があった.そこで「必要な物を, 必要なときに, 必要な順序で」作ることを目標に, 生産方式の改善を進めてきた.改善は生産指示の改善を軸としたソフトウェアとソフトウェアをささえるハードウェアの両面から行う必要がある.まずソフトウェアの改善から着手し, これによってハードウェアのボトルネックを明確にし, そのネック工程を一つずつ改善してきた.その結果, 仕掛が減少して生産のリードタイムが短縮され, 品質も向上し, 生産性も向上してきた.ここでは, 以上の経過を簡単に述べ, 具体的な改善事例としてカムシャフトラインの改善について報告する.

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ディーゼル乗用車の実路走行時におけるNOx排出量を効率的に評価するためには，車載式排出ガス計測装置を用いた実測に加えてシミュレーションを活用することが有効である．本研究では，車両の速度，加速度，変速段，道路勾配といった因子を用いることで，実路走行時NOx排出量の統計的予測モデルを構築した．

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