248-250 2025 [춘계학술대회]
| 제목 | 에탄올 100% 직분사 엔진의 NVH 개발 |
|---|---|
| 분야 | 지능형 샤시 및 제어 |
| 언어 | Korean |
| 저자 | 이남훈(지엠테크니컬센터코리아), 송재은(지엠테크니컬센터코리아), 유성준(지엠테크니컬센터코리아) |
| Key Words | Engine(엔진), Ethanol(에탄올), SIDI(Spark Ignition Direct Injection), NVH(Noise, Vibration, Harshness), Impulsive/roughness noise(충격성/거친 소음), Injector noise(인젝터 소음) |
| 초록 |
This paper presents the NVH (Noise, Vibration, and Harshness) development process for a small size ethanol 100% SIDI (Spark Ignition Direct Injection) engine designed for the emerging markets. Due to the high-octane rating of ethanol fuel, spark timing was advanced, resulting in significant combustion noise during acceleration and generating 0.5-order period impulsive and roughness noise. The crankshaft and main bearings were made thinner than previous engines to improve efficiency by reducing friction, limiting stiffness improvements. This leading to increased airborne noise and structure borne noise transmitted to the cabin via the engine RH MTG. To address these issues, various countermeasures, including spark timing and calibration optimization, crankshaft stiffness reinforcement, and increased crankshaft torsional damper inertia were implemented. Additionally, the high fuel pressure of the direct injection system caused ticking noise at idle, which was mitigated through fuel pressure and calibration optimization, and the application of PU foam on the high-pressure pump and upper side of intake manifold. The paper details these technical improvements and their impact on overall engine NVH performance. |
| 원문(PDF) | 다운로드 |