Engine performance prediction by calculating loss and discharge coefficients of intake manifold

• Main Authors: YOON HYUN SOK, KIMYOUNG, MIN YOUNG DAE
• Format: Patent
• Language: English; Korean
• Published: 18.06.2021
• Subjects: BLASTING; CALCULATING; COMBUSTION ENGINES; COMPUTING; CONTROLLING COMBUSTION ENGINES; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; HEATING; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS; LIGHTING; MECHANICAL ENGINEERING; PHYSICS; WEAPONS

The present invention relates to an invention which provides a method for predicting an engine system (engine) performance by calculating an optimum value of a loss factor and a discharge factor of an intake manifold and reflecting the same in calculating an engine performance value. Provided in the present invention is the method for predicting the engine performance capable of improving, a use of a default value of loss/discharge factors calculated by itself in a simulation tool by a hydrodynamic empirical formula in accordance with shape characteristics of the intake manifold, because the loss and discharge factors of each discretized part (a straight pipe, a curved pipe, and a volume element) cannot be theoretically obtained for a one-dimensional (1D) model converted from a generally made discretizing model. The method comprises a step of one-dimensional modeling a shape of the intake manifold to simplify an analysis model. 흡기매니폴드의 손실계수와 토출계수의 최적값을 계산하여 이를 기관 성능값을 계산하는 데 반영하여 엔진 시스템(기관)의 성능을 예측하는 방법을 제공하는 발명이다. 본 발명은, 일반적으로 이루어지는 이산화(dicretizing) 모델로부터 변환된 1차원(1D) 모델에 대해서 이산화된 각각의 파트(직관, 곡관, 체적요소)의 손실 및 토출계수를 이론적으로 구할 수 없기 때문에 흡기매니폴드의 형상 특성에 따라 유체역학 실험식에 의해 시뮬레이션 툴 내에서 자체 계산된 손실/토출계수의 디폴트값을 사용하는 것을 개선한 기관 성능 예측 방법을 제공한다.