【摘 要】
：
本文所设计的辅助ECU缸压采集与燃烧状态计算策略，可在实际发动机运行中，代替实验室燃烧分析仪的作用，通过与主控ECU通信，实现缸压的闭环控制，受限于ECU的处理能力，软件在采样时序中断中仅完成采集缸压信号与计算平均指示有效压力(IMEP)的任务。而累积放热率与CA50的计算，则放置到ECU主函数中进行，当软件采集完一缸的缸压数据之后，存储在一个数组中，并通知主函数采集完成，主函数在ECU空余时间依
论文部分内容阅读
本文所设计的辅助ECU缸压采集与燃烧状态计算策略，可在实际发动机运行中，代替实验室燃烧分析仪的作用，通过与主控ECU通信，实现缸压的闭环控制，受限于ECU的处理能力，软件在采样时序中断中仅完成采集缸压信号与计算平均指示有效压力(IMEP)的任务。而累积放热率与CA50的计算，则放置到ECU主函数中进行，当软件采集完一缸的缸压数据之后，存储在一个数组中，并通知主函数采集完成，主函数在ECU空余时间依次提取数组中的缸压采样数据，并根据公式计算累积放热率与CA50。当完成计算后，将通过CAN发送给主控ECU，并继续进行下一次缸压的采样。而缸压闭环反馈的引入，可使得燃烧状态可控，与开环控制相比，燃烧闭环控制具有明显的优势，在降低油耗、排放和故障诊断等各个方面都有更大的潜力，而且更适合于新技术HCCI燃烧技术和替代燃料在发动机上的应用。
其他文献
路面噪声的激励源及传达系统复杂,从路面传递给轮胎的力难以精确测量,因此,定量预测路面噪声非常困难.在工程上,为了定量、定性地预测路面噪声,常使用等价路面粗糙度来描述路面传递给轮胎的激励力.本文通过CAE模型、试验数据相结合的方法,论述等价路面粗糙度的概念,并在此基础上对悬架系统振动和车内噪声进行预测,确认了路面粗糙度的有效性.在悬架系统的设计阶段，使用等价路面粗糙度，通过数值计算和试验相结合的方法
Cracks in concrete are general and ubiquitous defects in bridges.The early age non-structural cracks are usually due to cement hydration and shrinkage deformation (autogenous shrinkage and drying shri
Experimental observations have concluded stress range and mean stress to be the two major load parameters that govern fatigue life of a structure like a bridge.This article discusses the effect of mea
In order to prevent transverse girder falling under intensity area and guarantee the safe of bearing,the common measure is to set up transverse restrainer device,such as block and shear key.Previous b
The Health,safety and environment (HSE) management had been applied in petroleum chemical industry,construction of expressways and bridges and so on in China.During detail design of Hong Kong-ZhuhaiMa
In order to resolve the durability problems of the damaged expansion joints and beatings during the service life of simply supported bridges,the idea of The only good joint is no joint was articulated
This paper evaluates the accuracy of equivalent linearization method (Eq.(1)) adopted in AASHTO through comparison of nonlinear and linear time history analysis.The isolation system is characterized b
Maintenance of existing steel structures is of great importance in Japan due to the rapid increasing number of aged structures (Lin et al.,2013).A strengthening method for old steel railway bridges by
Structural optimization is the subject of achieving the best performance for a structure with various constraints such as a given amount of material,limitation of peak stress and deflection.Based on s
在汽油价格不断上涨及加气站数量相对较少的形势下,开发汽油/CNG两用燃料发动机具有重要意义.本文介绍了当前汽油/CNG两用燃料发动机的主流开发思路,同时以一款1.5L排量的四缸汽油/CNG两用燃料发动机的工程化开发实例,B发动机的工程化开发实例，说明以汽油机为基础开发汽油/CNG两用燃料发动机，在工程化上是可行的。虽然在CNG工况下发动机动力性水平会下降15％左右，但由于此种开发模式具有开发周期短