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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Effect of partial-heating of the intake port on the mixture preparation and combustion of the first cranking cycle during the cold-start stage of port fuel injection engine
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Effect of partial-heating of the intake port on the mixture preparation and combustion of the first cranking cycle during the cold-start stage of port fuel injection engine

机译：在进气道燃油喷射发动机的冷启动阶段，进气道的局部加热对混合气的制备和第一曲柄循环燃烧的影响

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摘要

For Port Fuel Injection (PFI) engines, excessive fuel is needed for the first few cycles during the cold-start because of the unfavorable evaporation environment. The excessive fuel usually forms a fuel film which causes non-uniform mixture and becomes a major source of the Engine-Out Hydrocarbons (EOHC). In this paper, a partial-heating method was proposed to improve the evaporation of the deposited fuel film at the beginning of the cold-start of PFI engine. The partial-heating method focuses on increasing the surface temperature of the intake port end before the cranking start. In this study, the effect of the partial-heating was researched based on the first cranking cycle. The effect was experimentally investigated and discussed in terms of the mixture preparation, combustion and EOHC. The results showed that within the capacity of the on-board battery, the partial-heating led to efficient and effective heating of the surface of the intake port end. The fuel delivery efficiency was increased by over 10%. Fuel enrichment was reduced from 40. ms FPW to 30. ms FPW within 15. s of the partial-heating. Moreover, the mixture was found to burn faster in the partial-heating cases. Higher Indicated Mean Effective Pressure (IMEP) could be obtained with optimized spark timing in the partial-heating cases.
机译：对于港口燃料喷射（PFI）发动机，由于不利的蒸发环境，在冷启动期间的前几个循环中需要过量的燃料。过量的燃料通常会形成一层燃油膜，该燃油膜会导致混合不均匀，并成为引擎出烃（EOHC）的主要来源。本文提出了一种局部加热的方法，以改善PFI发动机冷启动开始时沉积的燃油膜的蒸发。局部加热方法着重于在起动之前增加进气口端部的表面温度。在这项研究中，基于第一个起动循环研究了局部加热的效果。从混合物制备，燃烧和EOHC方面对这种效果进行了实验研究和讨论。结果表明，在车载电池的容量范围内，局部加热导致进气口端部表面的有效加热。燃油输送效率提高了10％以上。在部分加热的15秒内，燃料富集从40.毫秒FPW降低到30.毫秒FPW。此外，发现该混合物在部分加热情况下燃烧更快。在局部加热的情况下，通过优化火花正时可以获得较高的指示平均有效压力（IMEP）。

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