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Study of Diesel Engine System for Electric Hybrid Vehicle
Published October 12, 2011 by Society of Automotive Engineers of Japan in Japan
In this study, we combined a diesel engine with the Toyota Hybrid System (THS) for better fuel economy. However, the THS could not be utilized to its full advantage, since a conventional diesel engine has high NOx emissions in high load where fuel economy is good. Therefore, reducing engine friction, lowering the compression ratio, and a low pressure loop exhaust gas recirculation system (LPL-EGR) were examined to achieve both low fuel consumption and low NOx emissions over a wide operating range. Applying this system to a test vehicle, it was verified that the fuel economy greatly surpassed that of a conventional vehicle and that NOx emissions could be reduced below the Euro 6 regulations without DeNOx catalysts.