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Yashiro, Masahiko
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Torque Control of a Small Gasoline Engine with a Variable Nozzle Turbine Turbocharger

Honeywell-Masahiko Yashiro
Kanazawa University-Kenichi Shimizu, Wataru Sato, Hiroshi Enomoto
  • Technical Paper
  • 2009-32-0169
Published 2009-11-03 by Society of Automotive Engineers of Japan in Japan
The ideal torque curve of automotive engines should be high and flat from low engine speed. To achieve this, we installed a variable nozzle turbine (VNT) turbocharger to a retail natural aspirated (NA) small gasoline engine. In the VNT turbocharger, variable vanes are set around the turbine wheel and form nozzles that changed the flow velocity of the exhaust gas. The vane position was controlled to adjust intake pressure at a target. As a result, the maximum torque improved by 27% and the engine speed at maximum torque was lowered by 1550rpm. A flat torque curve was achieved from 5450rpm to 8000rpm.
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The Package of the Turbocharged Engine for the FSAE Vehicle with the Custom Lubricant System

Honeywell-Masahiko Yashiro
Kanazawa University-Hiroshi Enomoto, Hiroyuki Motoi, Kyohei Takahashi, Koichiro Saito
  • Technical Paper
  • 2007-32-0118
Published 2007-10-30 by Society of Automotive Engineers of Japan in Japan
The turbocharged 4-stroke internal combustion engine was developed for FSAE, the annual collegiate racing competition. The dry sump lubricant system with the custom scavenge pump, KF-SC07, was designed. The crank axle height was 192mm, 76.5% of KF2004. Custom cam-shafts were designed making the torque fluctuation decreased less than 50% of KF2005. The compression ratio was changed. And the maximum boost pressure and the maximum torque gain were 25kPa (0.25 kgf/cm2) and 11%, respectively.
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Surge Control for Centrifugal Compressor of Turbocharger

Honeywell Turbocharging Systems Japan Inc.-Ronglei Gu, Yasuo Fujikawa, Masahiko Yashiro
  • Technical Paper
  • 2004-08-0232
Published 2004-05-19 by Society of Automotive Engineers of Japan in Japan
This paper is to study the performance of small centrifugal compressor with a recirculation valve. A simplified model is proposed and fractional factorial analysis is applied for sensitivity study. It is found that the temperature and turbulence of the recirculated air need to be controlled to improve the performance of the total compression system. Prototype was made and gas stand tests were carried out. Surge margin can be improved by about 48% with a well-designed compressor recirculation system.