An Ionization Equilibrium Analysis of the Spark Plug as an Ionization Sensor

Saitzkoff, André; Reinmann, Raymond; Berglind, Thomas; Glavmo, Magnus

doi:10.4271/960337

Cited by 99 publications

(30 citation statements)

References 1 publication

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“…adiabatic conditions, says that the ion current peak in the post flame phase (the rightmost peak in Fig. 2) should coincide with the pressure peak under high load conditions [6]. Empirical studies [7], under steady state conditions in a dynamometer, indicate that this is approximately true but that the model has difficulties describing low load phenomena, even if data is collected under ideal external conditions and then averaged.…”

Section: Ion Currentmentioning

confidence: 99%

An Ion Current Based Peak-Finding Algorithm for Pressure Peak Position Estimation

Hellring¹,

Holmberg²

2000

SAE Technical Paper Series

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In this paper a novel ion current based estimation scheme for the in-cylinder pressure peak position (PPP) is proposed. A reliable estimate is constructed by appropriate signal processing based on local curvatures of the post flame phase of the ion current. The peakfinding algorithm is simple and easy to implement in an engine control unit for feedback control of the combustion phasing. Results on real data, sampled onboard a commercial car are presented. Further, the performance of the algorithm is compared to two state of the art algorithms for PPP estimation from the ion current. The comparison shows that the algorithm presented in this paper outperforms its competitors 1 .

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Section: Ion Currentmentioning

confidence: 99%

An Ion Current Based Peak-Finding Algorithm for Pressure Peak Position Estimation

Hellring¹,

Holmberg²

2000

SAE Technical Paper Series

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“…There are often two current peaks, the first is believed to be the result of the small flame kernel passing the spark electrodes, and the second appearing close to the maximum cylinder pressure (some CAD before in this study), see Figure 18. One model for the second ion-current peak was presented by Saitzkoff et al [4], where the main factor the peak was thermal ionization of NO. Another model was presented by S. Yoshiyma et al [5], where the flame-front contact with the cylinder wall/piston crown contributes to the second ion-current peak.…”

Section: Ion Current Measurementsmentioning

confidence: 99%

The Potential of Using the Ion-Current Signal for Optimizing Engine Stability - Comparisons of Lean and EGR (Stoichiometric) Operation

Einewall¹,

Tunestål²,

Johansson³

2003

SAE Technical Paper Series

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Ion current measurements can give information useful for controlling the combustion stability in a multi-cylinder engine. Operation near the dilution limit (air or EGR) can be achieved and it can be optimized individually for the cylinders, resulting in a system with better engine stability for highly diluted mixtures. This method will also compensate for engine wear, e.g. changes in volumetric efficiency and fuel injector characteristics. Especially in a port injected engine, changes in fuel injector characteristics can lead to increased emissions and deteriorated engine performance when operating with a closed-loop lambda control system. One problem using the ion-current signal to control engine stability near the lean limit is the weak signal resulting in low signal to noise ratio. Measurements presented in this paper were made on a turbocharged 9.6 liter six cylinder natural gas engine with port injection. Each cylinder was individually controlled by a cylinder control module (CCM). A high turbulence combustion chamber was used to be able to operate with highly diluted mixtures. Comparisons between lean and EGR (stoichiometric) operation were made to investigate the potential of using the ion-current signal to control engine stability (cylinder to cylinder and cycle to cycle variations). A much stronger ion-current signal was found with EGR compared to lean operation, for the same load and comparable emissions.

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“…Ion-current signals have long been investigated as a combustion diagnostic tool [1][2][3][4][5][6]. In SI engines the prevailing conditions during combustion cause ionization of the gases inside the cylinder.…”

Section: Introductionmentioning

confidence: 99%