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1. (WO2017155873) RESISTIVE BASED COMBUSTION SENSING METHOD AND APPARATUS

Pub. No.:    WO/2017/155873    International Application No.:    PCT/US2017/020910
Publication Date: Fri Sep 15 01:59:59 CEST 2017 International Filing Date: Tue Mar 07 00:59:59 CET 2017
IPC: F01N 11/00
F02D 35/02
F02D 41/04
G01M 15/10
Applicants: KERDEA TECHNOLOGIES, INC.
Inventors: FOSAAEN, Ken, Ervin
GITANO-BRIGGS, Horizon Walker
Title: RESISTIVE BASED COMBUSTION SENSING METHOD AND APPARATUS
Abstract:
Sensing combustion events using a resistive based oxygen sensor exposed to exhaust gases of a periodic combustion process in a combustion engine. The oxygen sensor is disposed in the exhaust plenum of the engine and includes a metal oxide semiconductor layer bridging a gap between first and second electrodes. Spikes in the resistance of the metal oxide semiconductor layer, caused by its reaction to transient changes in the oxygen level and exhaust temperature, are indicated in a combustion signal. The combustion signal may be used to monitor for combustion misfire event(s). Further, a combustion misfire event may be detected by comparing the detected spike timing with expected spike timing, with a spike not being present at a time when a spike is expected indicating a combustion misfire event. Related devices and systems are also disclosed.