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Premixed compression ignition control for the piston engines

活塞发动机的预混压缩点火控制

基本信息

批准号：
15560179
负责人：
OHTA Yasuhiko
金额：
$ 2.24万
依托单位：
Nagoya Institute of Technology
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2004
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-15560179/
关键词：
Internal Combustion Engine Spontaneous Ignition Cool Flame Formaldehyde Negative Temperature Coefficient Regime Temperature Measurement Gas Analysis Octane Rating 予混合圧縮自着火着火抑制着火促進添加剤

项目摘要

The low-temperature-ignition classification ; three typical regime, "cool-flame dominant regime, "negative-temperature-coefficient regime" and "blue-flame dominant regime" would be a universal advanced/retarded criterion on ignition of fuel/air mixtures with formaldehyde doping for the ignition timing control in the premixed-compression-ignition engines. The formaldehyde would be a suppressing additive under the cool-flame generating constituents, temperature and pressure conditions, and a promoting additive under the poor cool-flame generating conditions in the cylinder charge during the preflame reactions leading to the ignition. The added formaldehyde is superfluous to the ignition event originally belonging to the cool-flame dominant regime, which would give a suppressing effect. On the other hand, the artificially added formaldehyde could be a starting point of preflame reactions leading to the final hot ignition belonging to the blue-flame-dominant regime, where a few fuel transition and low intermediates appear, and where the high temperature chemistry dominates. It allows a short cut of the preflame induction period, in consequence, a promoting effect for the ignition.A glow-plug assisted procedure is examined for the cold start of the natural-gas premixed-compression-ignition engine engines. A glow plug installation and formaldehyde addition will raise the load mixture temperature, which will result in the higher local temperature of compressed mixture. Spark-ignition operation for temperature increase would be an alternative starting procedure.

低温点火分类；三种典型的状态，“冷焰主导状态”、“负温度系数状态”和“蓝焰主导状态”将成为预混合压缩点火发动机中用于点火正时控制的掺有甲醛的燃料/空气混合物点火的通用提前/延迟准则。甲醛将是冷焰产生下的抑制添加剂成分、温度和压力条件，以及在导致点火的预燃反应期间气缸充量中不良冷焰产生条件下的促进添加剂。添加的甲醛对于原本属于冷焰主导状态的点火事件来说是多余的，这会产生抑制效果。另一方面，人工添加的甲醛可能是预燃反应的起点，导致最终的热点火属于蓝色火焰主导状态，其中出现一些燃料转变和低中间体，并且高温化学占主导地位。它可以缩短预燃诱导期，从而促进点火。研究了天然气预混压燃发动机冷启动的电热塞辅助程序。安装电热塞和添加甲醛将提高负载混合物温度，这将导致压缩混合物的局部温度较高。提高温度的火花点火操作将是另一种启动程序。