Patent · US Expired

Method for determining the running smoothness of an otto spark ignition engine

US6213092A · kind A · utility

3Cited by

4References

12Claims

0Family size

Assignee

Daimlerchrysler AG · US

Inventors

Peter Hohner · Echterdingen, DE
Jurgen Schenk · Dresden, DE
Hartung Wilstermann · Gaildorf, DE

Key dates

Filing date	Apr 15, 1999
Grant date	Apr 10, 2001
Priority date	—
Expiry date	Apr 15, 2019

Classification

Technology area (CPC F)Mechanical Engineering; Lighting; Heating
CPC primaryF02P2017/125
WIPO fieldEngines, pumps, turbines
WIPO sectorMechanical engineering

Abstract

The present invention relates to a method for determining the running smoothness of an Otto spark ignition engine by measuring the ionic current (I) in at least one combustion chamber of the Otto spark ignition engine. Once the spark plug has fired, a measuring voltage is applied to the spark plug, inducing the ionic current (I). Following each ionic current measurement, initially an active, average ionic-current value (I.sub.M) is defined, and a running-smoothness value (L) is subsequently determined from a reference value and the ionic-current average value (I.sub.M).

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.