Increasing knock detection sensitivity by combining knock sensor signal with a control oriented combustion model
[EN] Knock phenomenon reduces the thermal efficiency and restricts performance improvement in spark-ignited engines. Reliable and rapid knock recognition is crucial for the engine knock control. Among the wide set of knock detection techniques, those based on in-cylinder pressure sensors provide the...
| Autores: | , , , |
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| Tipo de recurso: | artículo |
| Fecha de publicación: | 2022 |
| País: | España |
| Institución: | Universitat Politècnica de València (UPV) |
| Repositorio: | RiuNet. Repositorio Institucional de la Universitat Politécnica de Valéncia |
| Idioma: | inglés |
| OAI Identifier: | oai:riunet.upv.es:10251/197840 |
| Acceso en línea: | https://riunet.upv.es/handle/10251/197840 |
| Access Level: | acceso abierto |
| Palabra clave: | Knock Knock sensor Resonance Combustion model INGENIERIA AEROESPACIAL MAQUINAS Y MOTORES TERMICOS 07.- Asegurar el acceso a energías asequibles, fiables, sostenibles y modernas para todos |
| Sumario: | [EN] Knock phenomenon reduces the thermal efficiency and restricts performance improvement in spark-ignited engines. Reliable and rapid knock recognition is crucial for the engine knock control. Among the wide set of knock detection techniques, those based on in-cylinder pressure sensors provide the most precise recognition. However, pressure sensors are still affected by challenges such as durability and cost. For on-board applications, knock is usually detected by vibration signal, but the accuracy is limited due to natural vibration and external noises.In this paper, a novel knock recognition method based on knock sensor signal is proposed. The method consists of the comparison of a resonance index obtained through the knock sensor signal and a combustion model capable of estimating the fraction of mass burned, and thus being able to estimate if the amplitude in the knock sensor signal is produced by the auto-ignition of certain amount of fuel. The proposed method was compared with a fixed threshold for knock sensor resonance intensity, the improvements were quantified by using as reference a high sensitive knock recognition method based on cylinder pressure. Results show that the proposed method is able to improve the accuracy in over a 10 % of knock detection than using one set threshold over the entire cycle. |
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