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Modeling Fresh Air Charge and Residual Gas Fraction on a Dual Independent Variable Valve Timing SI Engine

机译:在双独立可变气门正时Si发动机上建模新鲜空气电荷和残余气体分数

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We propose a model of in-cylinder air mass and residual gas fraction of a turbocharged SI engine with Variable Valve Timing (VVT) actuators. VVT devices are used to produce internal exhaust gas recirculation at part load, providing beneficial effects in terms of fuel consumption and pollutant emissions. At full load, VVT actuators permit to push back knock limit by scavenging fresh air to the exhaust pipes. Modelling in-cylinder composition is an essential task for control purpose. Actually, VVT actuators affect in-cylinder fresh air charge. This has an impact on engine torque output (leading to driveability problems), and on Fuel/Air Ratio (leading to pollution peaks). In this paper, we present a model of in-cylinder air mass and residual gas fraction using only commercial-line sensors (engine speed, intake manifold pressure and VVT actuators positions). It is designed for real-time control purpose. The model does not necessitate a lot of calibration time. The proposed method consists in modelling the quantity of fresh air going through the intake valve. The model is composed of three terms. All these terms have their own physical meaning: first term gives in-cylinder total mass, second term gives the gas mass that goes through both valves during the valve overlap (either backflow of burned gas, or scavenging of fresh air), and last term models the residual gas mass staying in the cylinder from one cycle to the next one.
机译:我们提出了一种具有可变气门正时(VVT)致动器的涡轮气体质量和涡轮增压Si发动机的缸内空气块的模型。 VVT器件用于在部件负荷下产生内部排气再循环,在燃料消耗和污染物排放方面提供有益效果。在满载时,VVT执行器允许通过将新鲜空气清除到排气管来推动撞击限制。模拟缸内组合物是控制目的的必备任务。实际上,VVT执行器会影响缸内清新空气充电。这对发动机扭矩输出(导致驾驶性问题)和燃料/空气比(导致污染峰)产生影响。在本文中,我们仅使用商业线传感器(发动机速度,进气歧管压力和VVT致动器位置)呈现缸内空气质量和残余气体馏分的模型。它专为实时控制目的而设计。该模型不需要大量的校准时间。所提出的方法包括模拟通过进气阀的新鲜空气量。该模型由三个术语组成。所有这些术语都有自己的物理含义:第一项给出圆柱总质量,第二项给出了在阀门重叠期间通过两个阀门的气体质量(烧伤气体的回流,或清新的新鲜空气的清除)和最后一个术语将剩余气体质量从一个循环保持在圆柱体到下一个循环。

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