Spectrogram Analysis of Accelerometer-Based Spark Knock Detection Waveforms

Scholl, D.; Barash, Terry; Russ, S.; Stockhausen, William F.

doi:10.4271/972020

Cited by 22 publications

(15 citation statements)

References 6 publications

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“…These transducers however are too costly for series manufactured engines. For these cases most often a piezoelectric accelerometer is mounted on the engine [19]. One or two sensors are used depending upon the engine type and cylinder count with each sensor able to detect knock from multiple cylinders using digital signal processing [13].…”

Section: Combustion Knockmentioning

confidence: 99%

“…In [18] by Naber et al, there were also presented results of hydrogen auto-ignition and combustion under high pressure at diesel engine conditions. Combustion knock characterization is most often accomplished in the laboratory by measurement of in-cylinder pressure [10][11][12][13]19,20,23]. In-cylinder pressure transducers are specially designed to withstand the dynamic pressures, high temperatures, and heat fluxes as a result of the combusting gases in the cylinder.…”

Section: Combustion Knockmentioning

confidence: 99%

See 1 more Smart Citation

Comparisons of hydrogen and gasoline combustion knock in a spark ignition engine

Szwaja¹,

Bhandary²,

Naber³

2007

International Journal of Hydrogen Energy

101

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Section: Combustion Knockmentioning

confidence: 99%

Section: Combustion Knockmentioning

confidence: 99%

Comparisons of hydrogen and gasoline combustion knock in a spark ignition engine

Szwaja¹,

Bhandary²,

Naber³

2007

International Journal of Hydrogen Energy

101

View full text Add to dashboard Cite

“…A wide variety of different knock intensity metrics have been proposed, based on different knock sensors and signal processing/detection algorithms. [12][13][14][15][16][17][18][19][20] The precise details of these metrics do not seem to be critical, providing they reflect the properties of the underlying knock process that they are intended to measure. This work, for example, is based on a prior experimental analysis of a large database of recorded knock intensity data derived from an accelerometer-based knock sensor mounted on a Ford 5.4 L V8 gasoline engine.…”

Section: Knock Characterizationmentioning

confidence: 99%

A dual-threshold knock controller

Jones

Shayestehmanesh

Frey

2016

International Journal of Engine Research

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The use of a knock intensity threshold set at a relatively high level is effective for identifying knocking cycles, but results in high Type II (false negative) classification errors. Many cycles, although classified as non-knocking cycles (i.e. below the threshold), are actually operating in an undesirably high knock rate region. A traditional controller is therefore likely to advance the spark further into this region, when the correct response would be to retard the spark. In this article, a new dual-threshold knock controller is presented in which a second threshold is introduced in order to identify non-knocking cycles more clearly. This enables the advance gain to be increased without adversely affecting other aspects of the response, thereby improving the transient and steady-state performance characteristics of the controller. The threshold values can also be optimized so as to minimize the total Type I and Type II misclassification errors, resulting in a significant improvement in most aspects of the controller response.

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“…The problem of knock sensing [2,3] and how to process knock signals to produce a knock intensity metric [4][5][6][7][8][9][10], is well covered in the literature. The knock control problem has been less treated.…”

Section: Introductionmentioning

confidence: 99%

Tuning and experimental evaluation of a likelihood-based engine knock controller

Thomasson

Eriksson

Lindell

et al. 2013

52nd IEEE Conference on Decision and Control

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Abstract-A new likelihood-based stochastic knock controller, that achieves a significantly improved regulatory response relative to conventional strategies, while also maintaining a rapid transient response is presented. Up until now it has only been evaluated using simulations and the main contribution here is the implementation and validation of the knock controller on a five cylinder engine with variable compression ratio. Furthermore, an extension of the fast response strategy and a re-tuning of the controller is shown to improve performance. The controller is validated with respect to its robustness to changes in engine operating condition as well as compression ratio. The likelihood-based controller is demonstrated in engine tests and compared to a conventional controller and it is shown that it is able to operate closer to the knock limit with less variations in control action without increasing the risk of engine damage.

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Spectrogram Analysis of Accelerometer-Based Spark Knock Detection Waveforms

Cited by 22 publications

References 6 publications

Comparisons of hydrogen and gasoline combustion knock in a spark ignition engine

Comparisons of hydrogen and gasoline combustion knock in a spark ignition engine

A dual-threshold knock controller

Tuning and experimental evaluation of a likelihood-based engine knock controller

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