公开(公告)号：US4562728A

公开(公告)日：1986-01-07

申请号：US677764

申请日：1984-12-03

申请人： George E. Timmerman

发明人： George E. Timmerman

IPC分类号： F02D45/00 ,  G01L23/00 ,  G01M15/04 ,  G01M15/00

CPC分类号： G01M15/046 ,  F02D2200/1015

摘要： A method and apparatus for determining the absolute compression pressure of each cylinder in an internal combustion engine is disclosed. The technique involves analyzing the changes in engine kinetic energy in order to calculate both the work of compression and expansion of each cylinder in a multi-cylinder engine typically during a decelerating engine cycle. Speed data is obtained and the work associated with the compression and expansion process for each cylinder is calculated and compared to the compression and expansion data of a good engine which is stored in computer memory. If a compression fault is present, it can be detected because that cylinder will display a decrease in both the work of compression and expansion. Once a faulted cylinder has been identified, the magnitude of the fault can be calculated and normalized and the compression pressure of each cylinder calculated and displayed.

摘要翻译： 公开了一种用于确定内燃机中的每个气缸的绝对压缩压力的方法和装置。 该技术涉及分析发动机动能的变化，以便通常在减速发动机循环期间计算多缸发动机中的每个气缸的压缩和膨胀的工作。 获得速度数据，并计算与每个气缸的压缩和膨胀过程相关联的工作，并将其与存储在计算机存储器中的良好发动机的压缩和膨胀数据进行比较。 如果存在压缩故障，则可以检测到压缩故障，因为该气缸将显示压缩和膨胀两种工作的减少。 一旦识别出故障的气缸，就可以计算和归一化故障的大小，并计算和显示每个气缸的压缩压力。