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1. (WO2018165074) SENSING COMBUSTION MISFIRE EVENTS IN ENGINES BY COMPARING SIGNALS DERIVED FROM TWO DIFFERENT TYPES OF OXYGEN SENSORS

Pub. No.:    WO/2018/165074    International Application No.:    PCT/US2018/021019
Publication Date: Fri Sep 14 01:59:59 CEST 2018 International Filing Date: Wed Mar 07 00:59:59 CET 2018
IPC: F01N 3/20
F01N 11/00
F02D 41/04
F02D 41/14
F02D 41/22
G01M 15/00
G01N 27/30
Applicants: KERDEA TECHNOLOGIES, INC.
Inventors: FOSAAEN, Ken Ervin
GITANO-BRIGGS, Horizon Walker
Title: SENSING COMBUSTION MISFIRE EVENTS IN ENGINES BY COMPARING SIGNALS DERIVED FROM TWO DIFFERENT TYPES OF OXYGEN SENSORS
Abstract:
Method and apparatus for monitoring and/or detecting combustion misfire events in periodic combustion processes in internal combustion engines, using combustion signals derived from a first oxygen sensor exposed to exhaust gas of a periodic combustion process and a second oxygen sensor exposed to the same exhaust gas. The first oxygen sensor is resistive-based, and responds relatively faster to changes in the temperature and/or composition of the exhaust gas. The second oxygen sensor is voltaic-based or ampometric-based, and responds relatively slower to changes to the temperature and/or composition of the exhaust gas. When the temperature and/or composition of the exhaust changes rapidly but transiently due to a combustion misfire event, the different response rates of the first and second combustion signals allows for the combustion misfire event(s) to be detected. Either and/or both oxygen sensors may be used to control the engine in a conventional fashion.