In-cylinder Ion Sensing Opportunities

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Background of Ion Sensing• Being studied for automotive byresearchers before 1980 for A/F ratio,cylinder pressure estimation• Installed in-cylinder or outside cylinderclose to the exhaust port• Used on SAAB Direct-IgnitionTM systemsince 1987 and later on SAAB Trionicsystem (by Mecel)• Originally for cylinder synchronizationand pre-ignition detection• Knock and misfire detection wereintroduced in 1992 on SAAB (by Mecel)• In-cylinder detection is used - eachcylinder
Mechanism of In-cylinder Ion Sensing• Ions produced by chemical and thermalionization:CH + O → CHO + + e -CHO + +H 2 O → H 3 O + + COM+ E ion ←→ M + + e -• Measuring circuitry integrated with the ignitionelectronics system• Controlling of spark event is unaffected• No mechanical modification of engine needed
Page 1 and 2: Designing Electronic Powertrain Con
Page 3: What Is Ion Sensing?• Ion Sensing
Page 7 and 8: Mechanism of In-cylinder Ion Sensin
Page 9 and 10: Example Hardware ofIn-cylinder Ion
Page 11 and 12: Current EffortsEarly knock detectio
Page 13 and 14: Knock Detection at High SpeedIon si
Page 15 and 16: Further Improvement Needed forQuant
Page 17 and 18: Fundamental Research - (Cont.)1.4Ig
Page 19 and 20: Location & Magnitude of Ionization
Page 21 and 22: Speed Effect on Ion SignalIonizatio
Page 23 and 24: Equivalence Ratio Effects atHigher
Page 25 and 26: Location of Peak Ionization Signal-
Page 27 and 28: Summary• The development of ion s
Page 29 and 30: Summary - (Cont.)• Engine operati

In-cylinder Ion Sensing Opportunities

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