Experimental Analysis of Combustion Noise Reduction with Performance Optimization in 110cc CVT Scooter Engine
Notice bibliographique
Résumé
<div class="section abstract"><div class="htmlview paragraph">Indian two wheeler market is one of the largest and highly competitive in the world. Indian scooter segment grows at a pace of around 30% YOY. The stiff competition among OEM’s to increase the market share with fuel efficient and high performance products pushes development and calibration engineers to burn the midnight oil to concoct innovative methods to design technology boosted product. Customer expectations are always high in terms of fuel economy, drivability and NVH. Due to higher level of complexity involved in CVT (Continuously Varying Transmission) engine, it is difficult to optimize for achieving best of NVH characteristics along with Fuel Economy, drivability and reduced exhaust emission. This paper describes the experiment conducted during the development of 110cc CVT four stroke scooter engine. The development and calibration of this scooter was mainly based on real world usage pattern (RWUP).</div><div class="htmlview paragraph">In order to obtain best performance from engine, ignition timing, fuel metering and CVT were optimized to achieve Maximum Brake Torque. With the ignition timing which can provide maximum braking torque the performance characteristics of the engine was meeting the PALS/FI target but severe combustion noise was observed which restricted the use of MBT ignition Timing. This technical paper describes the optimization methodology of this four stroke scooter engine on which the combustion noise (Noise generated due to rapid combustion of charge) is substantially reduced within acceptable noise levels without compromise in engine performance. The experiment comprise of noise source identification, analyzing the factors which affects combustion noise and optimization of these parameters to reduce engine combustion noise. Engine combustion parameters like peak cylinder pressure, pressure rise rate, and mass fraction burned along with heat release rate were analyzed by varying ignition timing and carburetion.</div><div class="htmlview paragraph">The Engine ignition timing being dual curve, ignition timing varies with engine speed and operating condition (namely Partially Open Throttle, POT and Wide Open Throttle, WOT). Combustion noise was observed to be higher at both POT and WOT condition. Ignition timing was optimized at specific operating zones where combustion noise was observed to be predominantly higher, the loss in engine performance due to change in ignition timing was substantiated with optimization of carburetor venturi size, air filter connecting tube effective diameter and CVT ratio. Experimental results shows significant reduction in combustion noise up to 5dB(A), without any compromise in engine performance, Fuel economy and drivability.</div></div>
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Prédiction distillée sur la base complète
Imitation des enseignantsNi prévalence calibrée, ni vérité terrain. Validation humaine à venir. Apprise à partir de 10 348 étiquettes directes de Codex et de 10 348 étiquettes directes de Gemma. Le mode candidate est l'union des têtes enseignantes seuillées; le consensus est leur intersection. Ces sorties portent le statut machine_predicted_unvalidated et ne sont ni des étiquettes humaines ni des étiquettes directes de modèles de pointe.
Scores Codex et Gemma par catégorie
| Catégorie | Codex | Gemma |
|---|---|---|
| Métarecherche | 0,000 | 0,000 |
| Méta-épidémiologie (sens strict) | 0,001 | 0,000 |
| Méta-épidémiologie (sens large) | 0,001 | 0,000 |
| Bibliométrie | 0,001 | 0,003 |
| Études des sciences et des technologies | 0,000 | 0,001 |
| Communication savante | 0,000 | 0,001 |
| Science ouverte | 0,001 | 0,000 |
| Intégrité de la recherche | 0,001 | 0,001 |
| Charge utile insuffisante (le modèle a refusé de juger) | 0,000 | 0,000 |
Scores machine (provisoires)
Les deux têtes enseignantes du modèle étudiant, lues sur ce travail. Un score ordonne la base pour la relecture; il n'affirme jamais une catégorie, et le statut de validation accompagne chaque rangée tel quel.
Scores de référence d'un modèle non mature (critères de maturité non atteints, 7 itérations). Un score ordonne; il n'affirme jamais une catégorie.
score_only:v0-immature-baseline · tel quel depuis la passe de notation : score_only signifie que le nombre peut ordonner les travaux, et qu'aucune étiquette de catégorie n'en découleClassification
machine, non validéePrédiction automatique; un appel candidat d’une seule tête enseignante, pas un consensus.
Le détail, modèle par modèle et score par score, se trouve en fin de page sous « Comment cette classification a été obtenue ».