1973-02-01

Analysis of Bypass Control Fuel Injection Systems for Small Diesel Engines by Digital Computer 730664

Conventional analyses are concerned with an overflow type of pump. However, in this paper, the bypass control type of pump is analyzed, and this analysis includes a fuel tank, an oil pipe, and a feed chamber, which until now have scarcely been analyzed. The potential energy and fluid resistance of oil pipes are considered, and in the high-pressure pipe, the fluid resistance is considered.
In conventional analyses, when a void appeared in the fuel injection system, it was necessary to substitute a different equation, and the treatment on the volume of void was believed to be unsatisfactory. In this paper, improvements on these points have been attempted.
When simulating a fuel injection system, it is necessary to determine such physical characteristics as the compressibility of fuel oil, the specific weight of fuel oil, the sonic velocity of fuel oil, the flow coefficient, etc. However, in the experimental characteristics obtained previously, there have been some unclear questions regarding the mixed air, the oil temperature, and the pressure. In this paper, these characteristics of the fuel and of the injection system were measured experimentally.
By incorporating these results in the simulated calculation, the results are in good agreement with the actual phenomenon, even when there is a void in the system and the computation time is short. The calculational procedure is thus considered to be applicable for practical purposes.

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