公开(公告)号：EP1426755A1

公开(公告)日：2004-06-09

申请号：EP03078652.9

申请日：2003-11-20

Applicant: Delphi Technologies, Inc.

Inventor： Nicholson, Warren Baxter ,  Lin, Yingjie ,  Oberdier, Larry M. ,  Heremans, Joseph Pierre

IPC: G01N27/02 ,  G01N27/06 ,  G01N33/28

CPC classification number: G01N33/2888 ,  G01N27/02

Abstract: Soot content in Diesel engine lubrication oil (28) is determined using electrical resistance measurements of the oil at high frequency. A sensor (10) in the form of a capacitor (26) is immersed in the oil, wherein the oil serves as a dielectric between the plates (22, 24). The capacitance (C) and resistance (R) between the plates change as a function of engine oil condition. An inductor (54) is placed in series with the sensor, and high frequencies are sweeped over a range to fmd resonance where the capacitive and inductive reactances cancel. At this frequency, the resistance (R) of the oil (28) is measured and the condition of the oil thereby determined.

Abstract translation: 柴油发动机润滑油（28）中的烟灰含量使用高频油的电阻测量来确定。 将电容器（26）形式的传感器（10）浸入油中，其中油用作板（22,24）之间的电介质。 板之间的电容（C）和电阻（R）随发动机机油状况而变化。 电感器（54）与传感器串联放置，并且高频率在一定范围内扫过fmd谐振，其中电容和感抗被抵消。 在该频率下，测量油（28）的电阻（R），从而确定油的状态。