A New Engine Control System Using Direct Fuel Injection and Variable Valve Timing

Extensive activities have been carried out, including variable valve timing systems, smoke recovery systems and direct fuel injection engines to reduce engine emissions and increase engine efficiency. In four-stroke engines, the valves are moved using a cam, and the shape of the cam determines the timing of each valve. But using variable valve timing in the engine is an effective and big step to improve the resulting performance. The variable electromagnetic valve scheduling system allows the exhaust and fuel valves to operate in a completely variable manner and to react to the smallest changes in the cylinder heads. Today, it is used to control the valve timing by using a hydraulic motor and a cam. But the design and construction of the system studied in this research have more modern technology. In this study, magnetic magnets were used to remove the camshaft, camshaft, crankshaft, crankshaft and many mechanical parts instead of using a hydraulic motor to control variable timing and valve movement. Magnets in which existing coils acquire magnetic properties by applying current to them. For each valve, two magnets are used, one to open and the other to close the valve with a spring. Many dynamic and magnetic parameters have been used in the design of this system, and many geometric constraints are involved in its design. The electromagnetic force generated is proportional to the volume of the magnetic magnet, and this designed volume is limited by the space of the cylinder head block. The speed distribution of valves and armatures is Gaussian. The minimum valve speed in an electromagnetic motor depends on the natural frequency of the mass and spring system. It is constant regardless of the motor speed.

Download Full-text

Emissions suppression mechanism of premixed diesel combustion with variable valve timing

International Journal of Engine Research ◽

10.1243/14680874jer01007 ◽

2007 ◽

Vol 8 (5) ◽

pp. 415-428 ◽

Cited By ~ 22

Author(s):

Y Murata ◽

J Kusaka ◽

M Odaka ◽

Y Daisho ◽

D Kawano ◽

...

Keyword(s):

Thermal Efficiency ◽

Fuel Injection ◽

Three Dimensional ◽

Expansion Ratio ◽

Variable Valve Timing ◽

Diesel Combustion ◽

Valve Timing ◽

Detailed Chemistry ◽

Suppression Mechanism ◽

Variable Valve

A variable valve timing (VVT) mechanism is applied to achieve premixed diesel combustion at higher load for low emissions and high thermal efficiency in a light-duty diesel engine. By means of late intake valve closing (LIVC), compressed gas temperatures near the top dead centre are lowered, thereby preventing too early ignition and increasing ignition delay to enhance fuel-air mixing. The variability of an effective compression ratio has significant potential for ignition timing control of conventional diesel fuel mixtures. At the same time, the expansion ratio is kept constant to ensure thermal efficiency. Combining the control of LIVC, exhaust gas recirculation (EGR), supercharging systems, and high-pressure fuel injection equipment can simultaneously reduce NO x and smoke. The NO x and smoke suppression mechanism in the premixed diesel combustion is analysed using a three-dimensional computational fluid dynamics (3D-CFD) code combined with detailed chemistry. LIVC can achieve a significant NO x and smoke reduction due to lowering combustion temperatures and avoiding local overrich regions in the mixtures respectively.

Download Full-text

A Multi-Cylinder HCCI Engine Model for Control

Dynamic Systems and Control, Parts A and B ◽

10.1115/imece2004-61966 ◽

2004 ◽

Cited By ~ 19

Author(s):

Jason S. Souder ◽

Parag Mehresh ◽

J. Karl Hedrick ◽

Robert W. Dibble

Keyword(s):

Design Process ◽

Control Design ◽

The Other ◽

Variable Valve Timing ◽

Valve Timing ◽

Coupling Effects ◽

Hcci Engine ◽

Engine Model ◽

Hcci Engines ◽

Variable Valve

Homogeneous charge compression ignition (HCCI) engines are a promising engine technology due to their low emissions and high efficiencies. Controlling the combustion timing is one of the significant challenges to practical HCCI engine implementations. In a spark-ignited engine, the combustion timing is controlled by the spark timing. In a Diesel engine, the timing of the direct fuel injection controls the combustion timing. HCCI engines lack such direct in-cylinder mechanisms. Many actuation methods for affecting the combustion timing have been proposed. These include intake air heating, variable valve timing, variable compression ratios, and exhaust throttling. On a multi-cylinder engine, the combustion timing may have to be adjusted on each cylinder independently. However, the cylinders are coupled through the intake and exhaust manifolds. For some of the proposed actuation methods, affecting the combustion timing on one cylinder influences the combustion timing of the other cylinders. In order to implement one of these actuation methods on a multi-cylinder engine, the engine controller must account for the cylinder-to-cylinder coupling effects. A multi-cylinder HCCI engine model for use in the control design process is presented. The model is comprehensive enough to capture the cylinder-to-cylinder coupling effects, yet simple enough for the rapid simulations required by the control design process. Although the model could be used for controller synthesis, the model is most useful as a starting point for generating a reduced-order model, or as a plant model for evaluating potential controllers. Specifically, the model includes the dynamics for affecting the combustion timing through exhaust throttling. The model is readily applicable to many of the other actuation methods, such as variable valve timing. Experimental results validating the model are also presented.

Download Full-text

Application of Multi-Objective Genetic Algorithm (MOGA) for Design Optimization of Valve Timing at Various Engine Speeds

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.264-265.1719 ◽

2011 ◽

Vol 264-265 ◽

pp. 1719-1724 ◽

Cited By ~ 5

Author(s):

A.K.M. Mohiuddin ◽

Md. Ataur Rahman ◽

Yap Haw Shin

Keyword(s):

Genetic Algorithm ◽

Design Optimization ◽

Robust Design Optimization ◽

Primary Concern ◽

Variable Valve Timing ◽

Valve Timing ◽

Engine Valve ◽

Multi Objective ◽

Multi Objective Genetic Algorithm ◽

Variable Valve

This paper aims to demonstrate the effectiveness of Multi-Objective Genetic Algorithm Optimization and its practical application on the automobile engine valve timing where the variation of performance parameters required for finest tuning to obtain the optimal engine performances. The primary concern is to acquire the clear picture of the implementation of Multi-Objective Genetic Algorithm and the essential of variable valve timing effects on the engine performances in various engine speeds. Majority of the research works in this project were in CAE software environment and method to implement optimization to 1D engine simulation. The paper conducts robust design optimization of CAMPRO 1.6L (S4PH) engine valve timing at various engine speeds using multiobjective genetic algorithm (MOGA) for the future variable valve timing (VVT) system research and development. This paper involves engine modelling in 1D software simulation environment, GT-Power. The GT-Power model is run simultaneously with mode Frontier to perform multiobjective optimization.

Download Full-text