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Shimizu, Kenichi
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Kinetic Modeling of Ammonia-SCR and Experimental Studies over Monolithic Cu-ZSM-5 Catalyst

Hokkaido University-Wataru Eijima, Gen Shibata, Yoshimitsu Kobashi, Ryutaro Koiwai, Hideyuki Ogawa, Kenichi Shimizu
Waseda University-Jin Kusaka
Published 2019-01-15 by SAE International in United States
Ammonia-selective catalytic reduction (SCR) systems have been introduced commercially in diesel vehicles, however catalyst systems with higher conversion efficiency and better control characteristics are required to know the actual emissions during operation and the emissions in random test cycles. Computational fluid dynamics (CFD) is an effective approach when applied to SCR catalyst development, and many models have been proposed, but these models need experimental verification and are limited in the situations they apply to. Further, taking account of redox cycle is important to have better accuracy in transient operation, however there are few models considering the cycle. Model development considering the redox reactions in a zeolite catalyst, Cu-ZSM-5, is the object of the research here, and the effects of exhaust gas composition on the SCR reaction and NH3 oxidation at high temperatures are investigated. The simulations are compared with the experimental results of a surrogate gas, a mixture of nitrogen monoxide (NO), oxygen (O2), water vapor (H2O), and nitrogen (N2), and the accuracy of the developed model is validated. To investigate the effects of O2…
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Fuel Consumption Test on 2-Axis Chassis Dynamometer~Effect of Restraint Method on Test Repeatability

Advanced Industrial Science and Technology-Kenichi Shimizu, Mitsuya Nihei
Honda R & D-Tetsuya Mizone, Emiko Mogi
  • Technical Paper
  • 2012-08-0401
Published 2012-10-03 by Society of Automotive Engineers of Japan in Japan
It is essential to conduct a fuel consumption test on the 2-axis chassis dynamometer for simulating the effect of regenerative braking. But, the 2-axis chassis dynamometer has some drawbacks that degrade the repeatability of test results due to unsteady tire mechanical loss on the drum.We have studied the method to reduce resultant error in fuel consumption test conducted on 2-axis chassis dynamometer for evaluating the effect of component efficiency such as tire efficiency. In this report, we discuss on the method to cancel the influence of alternator control that has top priority on regenerative brake without vehicle ECU information. We show also the method to reduce the influence of lateral force generated on the front wheel.
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Practical Method of Hydrogen Diffusion Simulation for Fuel Cell Electric Vehicle Development

Honda R&D Co.Ltd Automobile R&D Center-Mitsunori Matsumoto, Kenichi Shimizu
Published 2012-04-16 by SAE International in United States
Research was conducted on a method for the simulation of the diffusion of pressurized hydrogen leaking at high speed from a small opening into the complexly shaped space of a fuel cell electric vehicle with a practicable calculation time.The fact that the scale of the calculations was large and the calculation time was therefore extended represented issues in relation to this simulation method. The reduction of calculation time through the use of a three part partitioning method was proposed in order to resolve this issue. In this method, the calculation region is divided into three: In the first part, steady-state compressible flow calculations are conducted for the region close to the hydrogen outlet where the Mach number is higher than 0.5. In the second part, steady-state incompressible flow calculations are conducted for the process in which the hydrogen flow spreads and its flow rate declines in the space surrounding the first part space, using the results from the first part as boundary conditions. In the third part, unsteady-state incompressible flow calculations are conducted for all…
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Feed-Back Control of Ignition Timing Using Peak Cylinder Pressure Angle with Rough Timing Table

Kanazawa Univ.-Thu Huong Thi Tran, Hiroshi Enomoto, Kosuke Nishioka, Kenichi Shimizu
Published 2011-11-08 by Society of Automotive Engineers of Japan in Japan
Cylinder pressure is used for the closed-loop ignition angle control of a gasoline engine. This paper focused on the crank angle position where the maximum cylinder pressure reached (θPmax) and the relationship between the θPmax and the ignition angle. This closed-loop control set the θPmax a target value with an initial ignition angle and does not need a detailed ignition angle map. Response time and deflection with the target value are examined with a test bench. The θPmax target, ATDC 18 deg. is confirmed in consideration of the effect of knocking and the exhaust gas composition. The target ignition angle was varied step by step within a limit of upper and lower values, the response was observed and each gain was decided. At the engine speed of 5000 rpm, the duration to reach a steady value of θPmax is 0.10 s and the response time of ignition angle is 0.02 s. The response time is almost the same of two crankshaft revolutions; hence, an adequate performance is reliable because it can support the burning of…
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Numerical Simulation Method of Hydrogen Diffusion Into the Space Around the Hydrogen Tank of Fuel Cell Electric Vehicle

Honda R&D-Mitsunori Matsumoto, Kenichi Shimizu
  • Technical Paper
  • 2011-08-0387
Published 2011-10-12 by Society of Automotive Engineers of Japan in Japan
Research was conducted on a numerical simulation method that can simulate hydrogen diffusion behavior into the complexly shaped space around the hydrogen tank of a fuel cell electric vehicle. A three-part partitioning calculation method was newly devised and turbulence models were selected. The results confirmed that the simulation method had a practical calculation time and high calculation accuracy. These results indicated that the new method is useful for fuel cell electric vehicle development.
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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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Highly Productive New Hot Stamping Technology (Part 2)

Okayama Univ.-Hideaki Magome, Takehide Senuma, Akihiro Tanabe, Yoshito Takemoto, Kenichi Shimizu
  • Technical Paper
  • 2008-08-0523
Published 2008-10-22 by Society of Automotive Engineers of Japan in Japan
The piercing and trimming using laser deteriorate productivity of the hot stamping process and increase the cost of hot-stamped parts. In this study, the possibility if the laser cutting can be substituted by hot piercing and trimming is discussed from a viewpoint of the sensitivity against the delayed fracture. The stretch forming and hole expanding in hot stamping are also investigated.
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Development of Lower CLTE Polypropylene Resin for Automobile Interior Parts

NISSAN MOTOR CO., LTD.-Kenichi Shimizu, Hiroki Imada, Hiroshi Okuyama
  • Technical Paper
  • 2007-08-0447
Published 2007-10-01 by Society of Automotive Engineers of Japan in Japan
Recently, non-filled PP material is applied to the interior parts for the purpose of light weight and lower cost. However it has high CLTE, and the gap between the parts is required to prevent interference. This gap deteriorates interior appearance.We developed new low CLTE non-filled PP material to meet interior appearance requirement. And also, it brought lightweight and low-cost interior parts.
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Indoor Test of Ice and Snow Tires-Part 8 on the Correlation Between Surface Resistivity of Ice and Tire Characteristics on Ice

Mechanical Engineering Lab.-Kenichi Shimizu, Mitsuya Nihei
  • Technical Paper
  • 928121
Published 1992-05-12 by Society of Automotive Engineers of Japan in Japan
Surface resistivity of ice and tire characteristics on ice has been measured under various ice conditions. Temperature of ice, ice crystal size and concentration of impurities in ice were varied to change friction coefficient of tire on ice. Result shows that the surface resistivity of ice can be used as a scale for frictional characteristics of ice.