Essays about: "VVT"

Found 5 essays containing the word VVT.

  1. 1. Model-Predictive Control of Gas Exchange in a Gasoline Engine

    University essay from Linköpings universitet/Fordonssystem

    Author : George Jajji; [2021]
    Keywords : Control Engineering; Model Predictive Control; MPC; Gasoline Engine; Gas Exchange;

    Abstract : The process to induct air into engine cylinders, via the air inlet system and cylin-der port valves, is referred to as the "gas-exchange". Control is achieved by theturbo-charger, the intake throttle plate and the variable valve timing (VVT) sys-tem. These actuation systems traditionally use separate control with indepen-dent SISO feedback. READ MORE

  3. 2. Full Cycle Cylinder State Estimation in DI Engines with VVA

    University essay from Linköpings universitet/Fordonssystem

    Author : Linus Johansson; [2019]
    Keywords : VVT; Combustion engine; Thermodynamics; CRB;

    Abstract : Tougher legal demands on pollutions require a better developed understanding of the processes that take place in the cylinder. The thesis contributes with a cylinder model that uses the same set of equations for intake, compression,expansion/combustion and exhaust. READ MORE

  4. 3. Estimation of Engine Gas Temperatures During Pressure Transients

    University essay from Linköpings universitet/Fordonssystem

    Author : Marcus Wallson; [2018]
    Keywords : ;

    Abstract : Coming stringent regulatory emissions requirements with Real Driving Emissions testing amplifies the need for efficient engine control at all driving scenarios. This thesis has investigated the air-flow transients that appears when changing the throttle position very fast, such as at a stop sign. READ MORE

  5. 4. An Alternative Variable Valve Timing System for Heavy Duty Vehicles

    University essay from Luleå tekniska universitet/Institutionen för teknikvetenskap och matematik

    Author : Mikael Eriksson; Daniel Olovsson; [2016]
    Keywords : Variable; Valve Timing; VVT; Cam phaser; Heavy Duty; Scania; Commercial Vehicles; GT-SUITE; Dynamic; On off valve; Product Development; Machine Element;

    Abstract : The ability to control engine valve timing has the potential to alter the engine performance over the entire operating range. The outcome of valve timing technology enables the possibility to increase efficiency, lowering emissions, increase engine torque, etc. One of the simplest ways to obtain a variable valve timing is to use cam phasers. READ MORE

  6. 5. Transient Control of SIDI-Engine with VGT and VVT

    University essay from KTH/Maskinkonstruktion (Inst.)

    Author : Erik Klingborg; [2012]
    Keywords : ;

    Abstract : Today's development of spark ignited (SI) engines is to a large extent focused on downsizing, i.e where a large naturally aspirated engine is replaced with a smaller turbocharged engine with the same output power. READ MORE