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Yamada, Tomomi
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Development of Closed-Loop Robust Control System for Diesel Engines - Combustion Monitoring by Crank Angular Velocity Analysis and its Applications -

Toyota Motor Corporation-Yukitoshi Aoyama, Ryo Hasegawa, Tomomi Yamada, Takekazu Itoh, Terutoshi Tomoda, Yuichi Shimasaki
Published 2012-04-16 by SAE International in United States
Closed-loop robust control system that can monitor combustion state and control it into optimal state using crank angular velocity analysis was established. The system can be constructed without any change of the current hardware. It can avoid engine stall, deterioration of drivability and white smoke emission by misfire after filling low cetane fuels. This study was attempted to grasp the frequency characteristics of crank angular velocity both normal combustion and misfire with FFT (Fast Fourier Transform) and Wavelet Transform. FFT used for frequency analysis is generic method to acquire the frequency characteristics of steady oscillation, however is unsuitable for acquiring the frequency characteristics of transient oscillation. Therefore authors adopted Wavelet Transform and succeeded in grasping the phenomenon in misfiring in time sequential. With this knowledge, this study was attempted to determine the combustion instability by extracting frequency element of the 0.5 order of engine speed that is the characteristic frequency element in misfiring from pulse signal of the crank angle sensor with digital filters. With this method, misfire and combustion instability with white smoke caused…
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Study of Diesel Engine System for Electric Hybrid Vehicle

Toyota Motor Corp.-Tomomi Yamada, Hiroyuki Haga, Isao Matsumoto, Terutoshi Tomoda
  • Technical Paper
  • 2011-08-0214
Published 2011-10-12 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.
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Study of Diesel Engine System for Hybrid Vehicles

SAE International Journal of Alternative Powertrains

Toyota Motor Corp.-Tomomi Yamada, Hiroyuki Haga, Isao Matsumoto, Terutoshi Tomoda
  • Journal Article
  • 2011-01-2021
Published 2011-08-30 by SAE International in United States
In this study, we combined a diesel engine with the Toyota Hybrid System (THS). Utilizing the functions of the THS, reducing engine friction, lowering the compression ratio, and adopting a low pressure loop exhaust gas recirculation system (LPL-EGR) were examined to achieve both low fuel consumption and low nitrogen oxides (NOx) emissions over a wide operating range. After applying this system to a test vehicle it was verified that the fuel economy greatly surpassed that of a conventional diesel engine vehicle and that NOx emissions could be reduced below the value specified in the Euro 6 regulations without DeNOx catalysts.
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