Engine Knock Detection Using Multi-Spectrum Method

Kaneyasu, Masayoshi; Kurihara, Nobuo; Katogi, Kozo; Tokuda, Hiroatsu

doi:10.4271/920702

Cited by 15 publications

(5 citation statements)

References 1 publication

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“…More complex techniques were also being applied to interpret knocking cylinder pressure signals. Kaneyasu et al [213] of Hitachi used the Signal-to-Noise Ratio (SNR) in multiple frequency bands to separate knocking from nonknocking cycles. Samimy et al [214] of Ohio State University applied the Wigner-Ville Distribution to create time-frequency plots of knocking data.…”

Section: The 1990s: Chemical Kinetics Exothermic Centers and Time-fre...mentioning

confidence: 99%

Knock: A Century of Research

Corrigan¹,

Fontanesi²

2021

SAE Int. J. Engines

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Knock is one of the main limitations on increasing spark-ignition (SI) engine efficiency. This has been known for at least 100 years, and it is still the case today. Knock occurs when conditions ahead of the flame front in an SI engine result in one or more autoignition events in the end gas. The autoignition reaction rate is typically much higher than that of the flame-front propagation. This may lead to the creation of pressure waves in the combustion chamber and, hence, an undesirable noise that gives knock its name. The resulting increased mechanical and thermal loading on engine components may eventually lead to engine failure. Reducing the compression ratio lowers end-gas temperatures and pressures, reducing end-gas reactivity and, hence, mitigating knock. However, this has a detrimental effect on engine efficiency.Automotive companies must significantly reduce their fleet carbon dioxide (CO 2 ) values in the coming years to meet targets resulting from the 2015 Paris Agreement. One path towards meeting these is through partial or full electrification of the powertrain. However, the vast majority of automobiles in the near future will still feature a gasoline-fueled SI engine; hence, improvements in combustion engine efficiency remain fundamental.As knock has been a key limitation for so long, there is a huge amount of literature on the subject. A number of reviews on knock have already been published, including in recent years. These generally concentrate on current understanding and status. The present work, in contrast, aims to track the progress of research on knock from the 1920s right through to the present day. It is hoped that this can be a useful reference for new and existing researchers of the subject and give further weight to occasionally neglected historical activity, which can still provide important insights today.

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Section: The 1990s: Chemical Kinetics Exothermic Centers and Time-fre...mentioning

confidence: 99%

Knock: A Century of Research

Corrigan¹,

Fontanesi²

2021

SAE Int. J. Engines

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“…Previous efforts had been also made in detecting knock using the CWT [95, 100]. In addition to wavelet transform, Fourier analysis has also been used for knock detection [101, 102], where the spectral intensity of the knock resonance frequencies is used as the statistical test for knock determination. Other methods to detect knock (among many parametric and non-parametric methods) are: (i) the use of non-parametric statistical methods [103], (ii) the use of parametric methods based on neural networks [104], and (iii) the use of an ARMA parametric model, where the change in one of the model parameters estimated in real time can detect the knock, even in the initial stage of knock [105].…”

Section: Monitoring Requirements For Automotive Engines and Relevant Workmentioning

confidence: 99%

A survey on diagnostic methods for automotive engines

Mohammadpour

Franchek

Grigoriadis

2011

International Journal of Engine Research

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Faults affecting automotive engines can potentially lead to increased emissions, increased fuel consumption, or engine damage. These negative impacts may be prevented or at least alleviated if faults can be detected and isolated in advance of a failure. United States Federal and State regulations dictate that automotive engines operate with high-precision onboard diagnosis (OBD) systems that enable the detection of faults, resulting in higher emissions that exceed standard thresholds. In this paper, we survey and discuss the different aspects of fault detection and diagnosis in automotive engine systems. The paper collects some of the efforts made in academia and industry on fault detection and isolation for a variety of component faults, actuator faults, and sensor faults using various data-driven and model-based methods.

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“…Lee et al [1998] took this one step further by applying multiple filters to isolate the first three harmonics. Other researchers [Nakamura, N. et al, 1987, Kaneyasu, M. et al, 1992] have discovered improved knock controllability by using only the harmonic(s) which exhibited high signal to noise ratios.…”

Section: Processing Of Knock Vibration Signalsmentioning

confidence: 99%

Multivariate Knock Detection for Development and Production Applications

Tousignant

Reader

Tjong

2004

Transportation: Transportation and Environment

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Combustion knock caused by end gas autoignition continues to be a limiting factor in the performance of automotive internal combustion engines. As such, the availability of efficient knock detection methods is a prime requirement for the optimization of engine mapping and control. Current production knock control systems are based on the measurement of mechanical vibration induced by the acoustic resonance excited in the combustion chamber during autoignition. These vibrations are measured using accelerometers on the engine block. Conversely, knock detection in the laboratory environment during engine development or calibration generally involves either acoustic methods or acquisition of in-cylinder pressure. The purpose of this study is to develop an improved multi-transducer vibration-based knock detection method with applications in engine development and production. The possibility of replacing the pressure-based detection methods in the laboratory environment presents many advantages relating to cost and efficiency. Moreover, the economy of a vibration-based system coupled with improved correlation to laboratory methods represents great potential for performance improvements if applied to production applications.

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Engine Knock Detection Using Multi-Spectrum Method

Cited by 15 publications

References 1 publication

Knock: A Century of Research

Knock: A Century of Research

A survey on diagnostic methods for automotive engines

Multivariate Knock Detection for Development and Production Applications

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