公开(公告)号：US5203822A

公开(公告)日：1993-04-20

申请号：US682380

申请日：1991-04-09

申请人： Gunter Gurich ,  Eugen Schafer ,  Norbert Adolph ,  Thomas Schladt

发明人： Gunter Gurich ,  Eugen Schafer ,  Norbert Adolph ,  Thomas Schladt

IPC分类号： G01F17/00 ,  G01M3/26

CPC分类号： G01F17/00 ,  G01M3/26

摘要： A process and a device to measure the compression volume in a cylinder of an internal combustion engine in which process an overpressure in the combustion chamber is produced by introducing a controlled gas flow through existing spark plug or injection nozzle bores. A pressure expansion in the combustion chamber, caused by leakage of the piston rings, is analyzed. The size of leakage is determined by measuring step-by-step varied gas flows, introduced into the chamber and flowing out of the chamber through leakage, and measuring the resulting pressures built up in the chamber at a stationary state of flow and pressure. By combining the leakage characteristic and the pressure expansion characteristic the leaking volume having flowed out of the chamber during the expansion can be determined. With the knowledge of the leaking volume and the pressures and temperatures at the beginning and at the end of the expansion, the compression volume can be calculated with the aid of the general gas equation. In contrast to other known methods, the process makes it possible to determine the compression volume reliably without the need of dismounting the engine or sealing the combustion chamber.

摘要翻译： 一种测量内燃机气缸中的压缩体积的方法和装置，其中通过将受控的气流引入现有的火花塞或喷嘴孔而产生燃烧室中的过压。 分析了由活塞环的泄漏引起的燃烧室内的压力膨胀。 泄漏的大小是通过测量逐步变化的气体流量，通过泄漏导入腔室并从腔室中流出来测量的，并在静止的流动和压力状态下测量在腔室内产生的压力。 通过结合泄漏特性和膨胀特性，可以确定在膨胀期间从腔室流出的泄漏体积。 根据泄漏体积以及膨胀开始和结束时的压力和温度的知识，可以借助一般气体方程来计算压缩体积。 与其他已知的方法相反，该方法使得可以可靠地确定压缩体积，而不需要拆卸发动机或密封燃烧室。