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Reliability Improvement of Automotive Components By Surface Modification

Mechanical Engineering Research Laboratory Hitachi Ltd.-Y. Endoh, R. Okada
Mecahnical Engineering Research Laboratory Hitachi Ltd.-T. Yamada
  • Technical Paper
  • 91A104
Published 1996-04-01 by Associazione Tecnica Dell'Automobile in Italy
In this paper, several detailed studies on the surface properties of coatings are explained in order to make function of surface modification become more effective. As surface coatings, eletroless nickel plating, organic thin film, nitriding and antireflection coating by ultra fine particles are examined. Discussion of optimum production conditions and surface conditions for each coating is introduced.
 

The Effect of Atomization of Fuel Injectors on Engine Performance

Mechanical Engineering Research Laboratory Hitachi Ltd.-Kouji Nakagawa, Yoshio Okamoto
Sawa Works Hitachi Ltd.-Mineo Kashiwaya, Tokuo Kosuge
Published 1990-02-01 by SAE International in United States
The effect of fuel injection fuel atomization on engine performance has been studied in order to improve fuel economy and emission characteristrics.The fuel swirl method for injector atomization was studied both by fuel flow analysis and prototype experimentation. The goal of the studies was to develop fine fuel atomization over a wide engine operation range. As a result of our studies, it has been concluded that a desirable atomization can be obtained when the fuel is swirled in a circumferential direction and the swirl number is greater than 0.6.Protoype injectors applying these principles have been developed and tested in passenger car engines. The test results show that 3% improvement in fuel consumption and 8% reduction in hydro-carbon emission can be expected when fine atomization injectors are installed.These improvements are considered the result of a reduction in the fuel which would normally be quenched at the intake port and cylinder wall when large droplet size is present.
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