Patent · US Expired

Arrangement for recognizing misfirings in internal combustion engines with externally controlled ignition

US4986232A · kind A · utility

6Cited by

2References

22Claims

0Family size

Assignee

Dr. Ing. h.c. F. Porsche AG · DE

Inventors

Axel Richter · Hersbruck, DE
Patric Lardy · Weil der Stadt, DE
Ulrich Schempp · Tiefenbronn, DE
Herbert Glueck · Friolzheim, DE

Key dates

Filing date	Aug 7, 1990
Grant date	Jan 22, 1991
Priority date	—
Expiry date	Aug 7, 2010

Classification

Technology area (CPC G)Physics
CPC primaryG01M15/104
WIPO fieldMeasurement
WIPO sectorInstruments

Abstract

An arrangement for the recognition of misfirings of internal combustion engines with externally supplied ignition in which for the recognition of misfirings, the cylinders are combined into two groups and an ignition system of its own is coordinated to each group; a thermo-element is thereby arranged in the exhaust tract of a cylinder of each group. A pair of thermo-elements is series-connected in opposite polarity and the resulting thermo-voltage at the free ends is monitored by means of two threshold circuits. From the amount and sign of the resulting thermo-voltage, a defective ignition system can be determined and the corresponding cylinder group can be turned off.

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